SQ7414AEN www.vishay.com Vishay Siliconix Automotive N-Channel 60 V (D-S) 175 °C MOSFET FEATURES PRODUCT SUMMARY VDS (V) 60 RDS(on) (Ω) at VGS = 10 V 0.026 RDS(on) (Ω) at VGS = 4.5 V 0.036 ID (A) 16 Configuration Single Package PowerPAK 1212-8 PowerPAK® 1212-8 Single • TrenchFET® power MOSFET • Low thermal resistance PowerPAK® 1212-8 package with 1.07 mm profile • PWM optimized • 100 % Rg and UIS tested • AEC-Q101 qualified • Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 D D 8 D 7 D 6 5 D G 3. 3 m m 1 3.3 mm Top View 1 2 S 3 S 4 S G Bottom View N-Channel MOSFET S Marking Code: Q013 ABSOLUTE MAXIMUM RATINGS (TC = 25 °C, unless otherwise noted) PARAMETER SYMBOL LIMIT Drain-Source Voltage VDS 60 Gate-Source Voltage VGS ± 20 Continuous Drain Current a TC = 25 °C TC = 125 °C Continuous Source Current (Diode Conduction) a Pulsed Drain Current b Single Pulse Avalanche Current Single Pulse Avalanche Energy Maximum Power Dissipation b L = 0.1 mH TC = 25 °C TC = 125 °C Operating Junction and Storage Temperature Range ID 16 16 IDM 72 IAS 18 EAS 16 TJ, Tstg Soldering Recommendations (Peak Temperature) d, e V 16 IS PD UNIT 62 20 -55 to +175 260 A mJ W °C THERMAL RESISTANCE RATINGS PARAMETER Junction-to-Ambient Junction-to-Case (Drain) PCB Mount c SYMBOL LIMIT RthJA 81 RthJC 2.4 UNIT °C/W Notes a. Package limited. b. Pulse test; pulse width ≤ 300 μs, duty cycle ≤ 2 %. c. When mounted on 1" square PCB (FR4 material). d. See solder profile (www.vishay.com/doc?73257). The PowerPAK 1212-8 is a leadless package. The end of the lead terminal is exposed copper (not plated) as a result of the singulation process in manufacturing. A solder fillet at the exposed copper tip cannot be guaranteed and is not required to ensure adequate bottom side solder interconnection. e. Rework conditions: manual soldering with a soldering iron is not recommended for leadless components. S15-1878-Rev. C, 17-Aug-15 Document Number: 67050 1 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQ7414AEN www.vishay.com Vishay Siliconix SPECIFICATIONS (TC = 25 °C, unless otherwise noted) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT Static Drain-Source Breakdown Voltage Gate-Source Threshold Voltage Gate-Source Leakage Zero Gate Voltage Drain Current On-State Drain Current a Drain-Source On-State Resistance a Forward Transconductance b VDS VGS = 0 V, ID = 250 μA 60 - - VGS(th) VDS = VGS, ID = 250 μA 1.5 2 2.5 VDS = 0 V, VGS = ± 20 V IGSS IDSS ID(on) RDS(on) gfs - - ± 100 VGS = 0 V VDS = 60 V - - 1 VGS = 0 V VDS = 60 V, TJ = 125 °C - - 50 VGS = 0 V VDS = 60 V, TJ = 175 °C - - 150 VGS = 10 V VDS ≥ 5 V 20 - - VGS = 10 V ID = 5.7 A - 0.022 0.026 VGS = 10 V ID = 5.7 A, TJ = 125 °C - - 0.042 VGS = 10 V ID = 5.7 A, TJ = 175 °C - - 0.053 VGS = 4.5 V ID = 4.9 A - 0.030 0.036 - 20 - VDS = 15 V, ID = 5.7 A V nA μA A Ω S Dynamic b Input Capacitance Ciss Output Capacitance Coss Reverse Transfer Capacitance Crss Total Gate Charge c Qg Gate-Source Charge c Qgs Gate-Drain Charge c Qgd Gate Resistance Rg Turn-On Delay Time c Rise Time c Turn-Off Delay Time c Fall Time c VGS = 0 V VDS = 30 V, f = 1 MHz td(off) 784 980 142 178 - 57 71 - 16 24 - 2.5 - - 3.3 - f = 1 MHz 0.4 - 1.8 - 9 14 VDD = 30 V, RL = 30 Ω ID ≅ 1 A, VGEN = 10 V, Rg = 1 Ω - 9 14 - 20 29 - 10 15 VGS = 10 V VDS = 30 V, ID = 8.7 A td(on) tr - tf pF nC Ω ns Source-Drain Diode Ratings and Characteristics b Pulsed Current a ISM Forward Voltage VSD IF = 3.6 A, VGS = 0 V - - 72 A - 0.8 1.2 V Notes a. Pulse test; pulse width ≤ 300 μs, duty cycle ≤ 2 %. b. Guaranteed by design, not subject to production testing. c. Independent of operating temperature. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. S15-1878-Rev. C, 17-Aug-15 Document Number: 67050 2 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQ7414AEN www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (TA = 25 °C, unless otherwise noted) 30 30 VGS = 10 V thru 4 V 24 ID - Drain Current (A) ID - Drain Current (A) 24 18 12 VGS = 3 V 6 18 TC = 25 °C 12 6 TC = 125 °C TC = -55 °C 0 0 2 4 6 8 VDS - Drain-to-Source Voltage (V) 0 10 0 1 2 3 4 VGS - Gate-to-Source Voltage (V) Transfer Characteristics 10 50 8 40 gfs - Transconductance (S) ID - Drain Current (A) Output Characteristics 6 TC = 25 °C 4 2 TC = 125 °C TC = -55 °C 0 0 1 2 3 4 VGS - Gate-to-Source Voltage (V) TC = 25 °C TC = -55 °C 30 20 TC = 125 °C 10 0 5 0 3 0.04 1200 C - Capacitance (pF) RDS(on) - On-Resistance (Ω) 1500 VGS = 4.5 V 0.03 0.02 VGS = 10 V 0.00 0 16 20 Coss Crss 0 12 24 36 48 ID - Drain Current (A) VDS - Drain-to-Source Voltage (V) On-Resistance vs. Drain Current Capacitance S15-1878-Rev. C, 17-Aug-15 15 600 300 12 12 Ciss 900 0.01 8 9 Transconductance 0.05 4 6 ID - Drain Current (A) Transfer Characteristics 0 5 60 Document Number: 67050 3 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQ7414AEN www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (TA = 25 °C, unless otherwise noted) 2.5 ID = 8.7 A VDS = 30 V 8 RDS(on) - On-Resistance (Normalized) VGS - Gate-to-Source Voltage (V) 10 6 4 2 2.1 1.7 VGS = 4.5 V 1.3 0.9 0.5 0 0 3 6 10 13 -50 16 -25 0 25 50 75 100 125 150 Qg - Total Gate Charge (nC) TJ - Junction Temperature (°C) Gate Charge On-Resistance vs. Junction Temperature 100 175 0.15 10 0.12 TJ = 150 °C RDS(on) - On-Resistance (Ω) IS - Source Current (A) VGS = 10 V ID = 5.7 A 1 0.1 TJ = 25 °C 0.01 0.09 0.06 TJ = 150 °C 0.03 TJ = 25 °C 0.001 0.0 0.3 0.6 0.9 1.2 VSD - Source-to-Drain Voltage (V) 0.00 1.5 0 75 VDS - Drain-to-Source Voltage (V) 0.5 0.2 VGS(th) Variance (V) 10 On-Resistance vs. Gate-to-Source Voltage Source Drain Diode Forward Voltage -0.1 ID = 5 mA -0.4 ID = 250 μA -0.7 -1.0 -50 2 4 6 8 VGS - Gate-to-Source Voltage (V) -25 0 25 50 75 100 TJ - Temperature (°C) Threshold Voltage S15-1878-Rev. C, 17-Aug-15 125 150 175 ID = 1 mA 72 69 66 63 60 -50 -25 0 25 50 75 100 125 150 175 TJ - Junction Temperature (°C) Drain Source Breakdown vs. Junction Temperature Document Number: 67050 4 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQ7414AEN www.vishay.com Vishay Siliconix THERMAL RATINGS (TA = 25 °C, unless otherwise noted) 100 100 μs ID - Drain Current (A) 10 IDM Limited 1 ms ID Limited 10 ms 100 ms, 1 s, 10 s, DC 1 Limited by RDS(on)* 0.1 0.01 0.01 BVDSS Limited TC = 25 °C Single Pulse 0.1 1 10 VDS - Drain-to-Source Voltage (V) * VGS > minimum VGS at which RDS(on) is specified 100 Safe Operating Area 1 Normalized Effective Transient Thermal Impedance Duty Cycle = 0.5 0.2 0.1 Notes: 0.1 PDM 0.05 t1 t2 1. Duty Cycle, D = t1 t2 2. Per Unit Base = RthJA = 81 °C/W 0.02 3. TJM - TA = PDMZthJA(t) Single Pulse 4. Surface Mounted 0.01 10 -4 10 -3 10 -2 10 -1 1 10 100 1000 Square Wave Pulse Duration (s) Normalized Thermal Transient Impedance, Junction-to-Ambient S15-1878-Rev. C, 17-Aug-15 Document Number: 67050 5 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQ7414AEN www.vishay.com Vishay Siliconix THERMAL RATINGS (TA = 25 °C, unless otherwise noted) 2 Normalized Effective Transient Thermal Impedance 1 Duty Cycle = 0.5 0.2 0.1 0.1 Single Pulse 0.05 0.02 0.01 10-4 10-3 10-2 Square Wave Pulse Duration (s) 10-1 1 Normalized Thermal Transient Impedance, Junction-to-Case Note • The characteristics shown in the two graphs - Normalized Transient Thermal Impedance Junction-to-Ambient (25 °C) - Normalized Transient Thermal Impedance Junction-to-Case (25 °C) are given for general guidelines only to enable the user to get a “ball park” indication of part capabilities. The data are extracted from single pulse transient thermal impedance characteristics which are developed from empirical measurements. The latter is valid for the part mounted on printed circuit board - FR4, size 1" x 1" x 0.062", double sided with 2 oz. copper, 100 % on both sides. The part capabilities can widely vary depending on actual application parameters and operating conditions. Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see www.vishay.com/ppg?67050. S15-1878-Rev. C, 17-Aug-15 Document Number: 67050 6 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 SQ7414AEN www.vishay.com REVISION HISTORY REVISION C a DATE 04-Aug-15 Vishay Siliconix DESCRIPTION OF CHANGE • Revised Rg minimum limit Note a. As of April 2014 S15-1878-Rev. C, 17-Aug-15 Document Number: 67050 7 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Ordering Information www.vishay.com Vishay Siliconix PowerPAK® 1212-8 and PowerPAK 1212-8W Ordering codes for the SQ rugged series power MOSFETs in the PowerPAK 1212-8 and PowerPAK 1212-8W packages: DATASHEET PART NUMBER OLD ORDERING CODE a NEW ORDERING CODE SQ7414AEN SQ7414AEN-T1-GE3 SQ7414AEN-T1_GE3 SQ7414AENW - SQ7414AENW-T1_GE3 SQ7415AEN SQ7415AEN-T1-GE3 SQ7415AEN-T1_GE3 SQ7415AENW - SQ7415AENW-T1_GE3 SQS401EN SQS401EN-T1-GE3 SQS401EN-T1_GE3 SQS401ENW - SQS401ENW-T1_GE3 SQS405EN SQS405EN-T1-GE3 SQS405EN-T1_GE3 SQS405ENW - SQS405ENW-T1_GE3 SQS420EN SQS420EN-T1-GE3 SQS420EN-T1_GE3 SQS423EN SQS423EN-T1-GE3 SQS423EN-T1_GE3 SQS460EN SQS460EN-T1-GE3 SQS460EN-T1_GE3 SQS462EN SQS462EN-T1-GE3 SQS462EN-T1_GE3 SQS482EN SQS482EN-T1-GE3 SQS482EN-T1_GE3 SQS484EN SQS484EN-T1-GE3 SQS484EN-T1_GE3 SQS490EN SQS490EN-T1-GE3 SQS490EN-T1_GE3 SQS840EN SQS840EN-T1-GE3 SQS840EN-T1_GE3 SQS850EN SQS850EN-T1-GE3 SQS850EN-T1_GE3 Note a. Old ordering code is obsolete and no longer valid for new orders Revision: 25-Aug-15 Document Number: 66697 1 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 Package Information www.vishay.com Vishay Siliconix D4 PowerPAK® 1212-8, (Single / Dual) W H E2 E4 L K M θ e 1 Z D5 D D2 2 2 D1 8 1 5 4 θ 4 b 3 L1 E3 A1 Backside view of single pad H 2 E1 E Detail Z L K E2 E4 D2 D3(2x) D4 c A H 1 D1 2 K1 Notes 1. Inch will govern 2 Dimensions exclusive of mold gate burrs 3. Dimensions exclusive of mold flash and cutting burrs D2 3 4 b θ D5 θ E3 Backside view of dual pad DIM. MILLIMETERS INCHES MIN. NOM. MAX. MIN. NOM. MAX. A 0.97 1.04 1.12 0.038 0.041 0.044 A1 0.00 - 0.05 0.000 - 0.002 b 0.23 0.30 0.41 0.009 0.012 0.016 c 0.23 0.28 0.33 0.009 0.011 0.013 D 3.20 3.0 3.40 0.126 0.130 0.134 D1 2.95 3.05 3.15 0.116 0.120 0.124 D2 1.98 2.11 2.24 0.078 0.083 0.088 D3 0.48 - 0.89 0.019 - 0.035 D4 0.47 typ. D5 2.3 typ. 0.0185 typ 0.090 typ E 3.20 3.30 3.40 0.126 0.130 0.134 E1 2.95 3.05 3.15 0.116 0.120 0.124 E2 1.47 1.60 1.73 0.058 0.063 0.068 E3 1.75 1.85 1.98 0.069 0.073 0.078 E4 0.034 typ. 0.013 typ. e 0.65 BSC 0.026 BSC K 0.86 typ. K1 0.35 - 0.034 typ. - 0.014 - - H 0.30 0.41 0.51 0.012 0.016 0.020 L 0.30 0.43 0.56 0.012 0.017 0.022 L1 0.06 0.13 0.20 0.002 0.005 0.008 0° - 12° 0° - 12° W 0.15 0.25 0.36 0.006 0.010 0.014 M 0.125 typ. 0.005 typ. ECN: T16-0287-Rev. L, 06-Jun-16 DWG: 5882 Revison: 06-Jun-16 Document Number: 71656 1 For technical questions, contact: [email protected] THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000 AN822 Vishay Siliconix PowerPAK® 1212 Mounting and Thermal Considerations Johnson Zhao MOSFETs for switching applications are now available with die on resistances around 1 mΩ and with the capability to handle 85 A. While these die capabilities represent a major advance over what was available just a few years ago, it is important for power MOSFET packaging technology to keep pace. It should be obvious that degradation of a high performance die by the package is undesirable. PowerPAK is a new package technology that addresses these issues. The PowerPAK 1212-8 provides ultra-low thermal impedance in a small package that is ideal for space-constrained applications. In this application note, the PowerPAK 1212-8’s construction is described. Following this, mounting information is presented. Finally, thermal and electrical performance is discussed. THE PowerPAK PACKAGE The PowerPAK 1212-8 package (Figure 1) is a derivative of PowerPAK SO-8. It utilizes the same packaging technology, maximizing the die area. The bottom of the die attach pad is exposed to provide a direct, low resistance thermal path to the substrate the device is mounted on. The PowerPAK 1212-8 thus translates the benefits of the PowerPAK SO-8 into a smaller package, with the same level of thermal performance. (Please refer to application note “PowerPAK SO-8 Mounting and Thermal Considerations.”) The PowerPAK 1212-8 has a footprint area comparable to TSOP-6. It is over 40 % smaller than standard TSSOP-8. Its die capacity is more than twice the size of the standard TSOP-6’s. It has thermal performance an order of magnitude better than the SO-8, and 20 times better than TSSOP-8. Its thermal performance is better than all current SMT packages in the market. It will take the advantage of any PC board heat sink capability. Bringing the junction temperature down also increases the die efficiency by around 20 % compared with TSSOP-8. For applications where bigger packages are typically required solely for thermal consideration, the PowerPAK 1212-8 is a good option. Both the single and dual PowerPAK 1212-8 utilize the same pin-outs as the single and dual PowerPAK SO-8. The low 1.05 mm PowerPAK height profile makes both versions an excellent choice for applications with space constraints. PowerPAK 1212 SINGLE MOUNTING To take the advantage of the single PowerPAK 1212-8’s thermal performance see Application Note 826, Recommended Minimum Pad Patterns With Outline Drawing Access for Vishay Siliconix MOSFETs. Click on the PowerPAK 1212-8 single in the index of this document. In this figure, the drain land pattern is given to make full contact to the drain pad on the PowerPAK package. This land pattern can be extended to the left, right, and top of the drawn pattern. This extension will serve to increase the heat dissipation by decreasing the thermal resistance from the foot of the PowerPAK to the PC board and therefore to the ambient. Note that increasing the drain land area beyond a certain point will yield little decrease in foot-to-board and foot-toambient thermal resistance. Under specific conditions of board configuration, copper weight, and layer stack, experiments have found that adding copper beyond an area of about 0.3 to 0.5 in2 of will yield little improvement in thermal performance. Figure 1. PowerPAK 1212 Devices Document Number 71681 03-Mar-06 www.vishay.com 1 AN822 Vishay Siliconix PowerPAK 1212 DUAL To take the advantage of the dual PowerPAK 1212-8’s thermal performance, the minimum recommended land pattern can be found in Application Note 826, Recommended Minimum Pad Patterns With Outline Drawing Access for Vishay Siliconix MOSFETs. Click on the PowerPAK 1212-8 dual in the index of this document. The gap between the two drain pads is 10 mils. This matches the spacing of the two drain pads on the PowerPAK 1212-8 dual package. This land pattern can be extended to the left, right, and top of the drawn pattern. This extension will serve to increase the heat dissipation by decreasing the thermal resistance from the foot of the PowerPAK to the PC board and therefore to the ambient. Note that increasing the drain land area beyond a certain point will yield little decrease in foot-to-board and foot-toambient thermal resistance. Under specific conditions of board configuration, copper weight, and layer stack, experiments have found that adding copper beyond an area of about 0.3 to 0.5 in2 of will yield little improvement in thermal performance. ture profile used, and the temperatures and time duration, are shown in Figures 2 and 3. For the lead (Pb)-free solder profile, see http://www.vishay.com/ doc?73257. REFLOW SOLDERING Vishay Siliconix surface-mount packages meet solder reflow reliability requirements. Devices are subjected to solder reflow as a preconditioning test and are then reliability-tested using temperature cycle, bias humidity, HAST, or pressure pot. The solder reflow tempera- Ramp-Up Rate + 6 °C /Second Maximum Temperature at 155 ± 15 °C 120 Seconds Maximum Temperature Above 180 °C 70 - 180 Seconds Maximum Temperature 240 + 5/- 0 °C Time at Maximum Temperature 20 - 40 Seconds Ramp-Down Rate + 6 °C/Second Maximum Figure 2. Solder Reflow Temperature Profile 10 s (max) 210 - 220 °C 3 ° C/s (max) 4 ° C/s (max) 183 °C 140 - 170 °C 50 s (max) 3° C/s (max) 60 s (min) Pre-Heating Zone Reflow Zone Maximum peak temperature at 240 °C is allowed. Figure 3. Solder Reflow Temperatures and Time Durations www.vishay.com 2 Document Number 71681 03-Mar-06 AN822 Vishay Siliconix TABLE 1: EQIVALENT STEADY STATE PERFORMANCE Package SO-8 TSSOP-8 TSOP-8 PPAK 1212 PPAK SO-8 Configuration Single Dual Single Dual Single Dual Single Dual Single Dual Thermal Resiatance RthJC(C/W) 20 40 52 83 40 90 2.4 5.5 1.8 5.5 PowerPAK 1212 Standard SO-8 49.8 °C 2.4 °C/W Standard TSSOP-8 85 °C 20 °C/W TSOP-6 149 °C 52 °C/W 125 °C 40 °C/W PC Board at 45 °C Figure 4. Temperature of Devices on a PC Board THERMAL PERFORMANCE Introduction Spreading Copper A basic measure of a device’s thermal performance is the junction-to-case thermal resistance, Rθjc, or the junction to- foot thermal resistance, Rθjf. This parameter is measured for the device mounted to an infinite heat sink and is therefore a characterization of the device only, in other words, independent of the properties of the object to which the device is mounted. Table 1 shows a comparison of the PowerPAK 1212-8, PowerPAK SO-8, standard TSSOP-8 and SO-8 equivalent steady state performance. By minimizing the junction-to-foot thermal resistance, the MOSFET die temperature is very close to the temperature of the PC board. Consider four devices mounted on a PC board with a board temperature of 45 °C (Figure 4). Suppose each device is dissipating 2 W. Using the junction-to-foot thermal resistance characteristics of the PowerPAK 1212-8 and the other SMT packages, die temperatures are determined to be 49.8 °C for the PowerPAK 1212-8, 85 °C for the standard SO-8, 149 °C for standard TSSOP-8, and 125 °C for TSOP-6. This is a 4.8 °C rise above the board temperature for the PowerPAK 1212-8, and over 40 °C for other SMT packages. A 4.8 °C rise has minimal effect on rDS(ON) whereas a rise of over 40 °C will cause an increase in rDS(ON) as high as 20 %. Designers add additional copper, spreading copper, to the drain pad to aid in conducting heat from a device. It is helpful to have some information about the thermal performance for a given area of spreading copper. Figure 5 and Figure 6 show the thermal resistance of a PowerPAK 1212-8 single and dual devices mounted on a 2-in. x 2-in., four-layer FR-4 PC boards. The two internal layers and the backside layer are solid copper. The internal layers were chosen as solid copper to model the large power and ground planes common in many applications. The top layer was cut back to a smaller area and at each step junction-to-ambient thermal resistance measurements were taken. The results indicate that an area above 0.2 to 0.3 square inches of spreading copper gives no additional thermal performance improvement. A subsequent experiment was run where the copper on the back-side was reduced, first to 50 % in stripes to mimic circuit traces, and then totally removed. No significant effect was observed. Document Number 71681 03-Mar-06 www.vishay.com 3 AN822 Vishay Siliconix 130 105 Spreading Copper (sq. in.) Spreading Copper (sq. in.) 120 95 110 100 RthJ A (°C/W) RthJA (°C/W) 85 75 65 90 80 50 % 100 % 70 100 % 55 0% 60 50 % 0% 50 45 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 Figure 5. Spreading Copper - Si7401DN Figure 6. Spreading Copper - Junction-to-Ambient Performance CONCLUSIONS As a derivative of the PowerPAK SO-8, the PowerPAK 1212-8 uses the same packaging technology and has been shown to have the same level of thermal performance while having a footprint that is more than 40 % smaller than the standard TSSOP-8. Recommended PowerPAK 1212-8 land patterns are provided to aid in PC board layout for designs using this new package. The PowerPAK 1212-8 combines small size with attractive thermal characteristics. By minimizing the thermal rise above the board temperature, PowerPAK simplifies thermal design considerations, allows the device to run cooler, keeps rDS(ON) low, and permits the device to handle more current than a same- or larger-size MOSFET die in the standard TSSOP-8 or SO-8 packages. www.vishay.com 4 Document Number 71681 03-Mar-06 Application Note 826 Vishay Siliconix RECOMMENDED MINIMUM PADS FOR PowerPAK® 1212-8 Single 0.152 (3.860) 0.039 0.068 (0.990) (1.725) 0.010 (0.255) (2.390) 0.094 0.088 (2.235) 0.016 (0.405) 0.026 (0.660) 0.025 0.030 (0.635) (0.760) Recommended Minimum Pads Dimensions in Inches/(mm) Return to Index Return to Index APPLICATION NOTE Document Number: 72597 Revision: 21-Jan-08 www.vishay.com 7 Legal Disclaimer Notice www.vishay.com Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. 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We confirm that all the products identified as being compliant to IEC 61249-2-21 conform to JEDEC JS709A standards. Revision: 02-Oct-12 1 Document Number: 91000