Si4532CDY Vishay Siliconix N- and P-Channel 30 V (D-S) MOSFET FEATURES PRODUCT SUMMARY RDS(on) () ID (A)a 0.047 at VGS = 10 V 6.0 0.065 at VGS = 4.5 V 5.2 VDS (V) N-Channel 30 P-Channel - 30 0.089 at VGS = - 10 V - 4.3 0.140 at VGS = - 4.5 V - 3.4 Qg (Typ.) 2.75 4.1 • Halogen-free According to IEC 61249-2-21 Definition • TrenchFET® Power MOSFET • 100 % Rg Tested • 100 % UIS Tested • Compliant to RoHS Directive 2002/95/EC APPLICATIONS S1 1 8 D1 G1 2 7 D1 S2 3 6 D2 G2 4 5 D2 D1 S2 • DC/DC Converter • Load Switch SO-8 G2 G1 Top View Ordering Information: Si4532CDY-T1-GE3 (Lead (Pb)-free and Halogen-free) S1 D2 N-Channel MOSFET P-Channel MOSFET ABSOLUTE MAXIMUM RATINGS (TA = 25 °C, unless otherwise noted) Parameter Symbol N-Channel P-Channel Drain-Source Voltage VDS 30 - 30 Gate-Source Voltage VGS Continuous Drain Current (TJ = 150 °C) TA = 25 °C 6.0 ID TA = 70 °C IDM Pulsed Drain Current (10 µs Pulse Width) Source-Drain Current Diode Current TC = 25 °C TA = 25 °C IS - 4.3 4.9 - 3.4 4.9b, c - 3.4b, c 3.9b, c - 2.7b, c - 15 - 2.3 1.5b, c - 1.5b, c 24 - 12 ISM Single Pulse Avalanche Current IAS 7 8 EAS 2.5 3.2 2.78 2.78 L = 0.1 mH TC = 25 °C TC = 70 °C Maximum Power Dissipation TA = 25 °C PD TA = 70 °C mJ 1.78 1.78 1.78b, c 1.78b, c 1.14b, c 1.14b, c TJ, Tstg Operating Junction and Storage Temperature Range A 24 2.3 Pulsed Source-Drain Current Single Pulse Avalanche Energy V ± 20 TC = 25 °C TC = 70 °C Unit W - 55 to 150 °C THERMAL RESISTANCE RATINGS N-Channel Parameter Maximum Junction-to-Ambient b, d Maximum Junction-to-Foot (Drain) P-Channel Symbol Typ. Max. Typ. Max. t 10 s RthJA 57 70 57 70 Steady State RthJF 37 45 37 45 Unit °C/W Notes: a. Based on TC = 25 °C. b. Surface mounted on 1" x 1" FR4 board. c. t = 10 s. d. Maximum under steady state conditions is 120 °C/W (N-Channel) and 110 °C/W (P-Channel). Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 www.vishay.com 1 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 Si4532CDY Vishay Siliconix SPECIFICATIONS (TJ = 25 °C, unless otherwise noted) Parameter Symbol Test Conditions Min. Typ.a Max. Unit Static Drain-Source Breakdown Voltage VDS Temperature Coefficient VGS(th) Temperature Coefficient Gate-Source Threshold Voltage Gate-Body Leakage Zero Gate Voltage Drain Current On-State Drain Currentb Drain-Source On-State Resistanceb Forward Transconductanceb VDS VDS/TJ VGS(th)/TJ VGS(th) IGSS IDSS ID(on) RDS(on) gfs VGS = 0 V, ID = 250 µA N-Ch 30 VGS = 0 V, ID = - 250 µA P-Ch - 30 ID = 250 µA N-Ch V 33 ID = - 250 µA P-Ch - 33 ID = 250 µA N-Ch - 5.8 mV/°C IID = - 250 µA P-Ch VDS = VGS, ID = 250 µA N-Ch 1.0 3.0 VDS = VGS, ID = - 250 µA P-Ch - 1.0 - 3.0 VDS = 0 V, VGS = ± 20 V 4.5 N-Ch 100 P-Ch - 100 VDS = 30 V, VGS = 0 V N-Ch 1 VDS = - 30 V, VGS = 0 V P-Ch -1 VDS = 30 V, VGS = 0 V, TJ = 55 °C N-Ch 5 VDS = - 30 V, VGS = 0 V, TJ = 55 °C P-Ch VDS =5 V, VGS = 10 V N-Ch 20 VDS = -5 V, VGS = - 10 V P-Ch - 12 V nA µA -5 A VGS = 10 V, ID = 3.5 A N-Ch 0.038 0.047 VGS = - 10 V, ID = - 3.5 A P-Ch 0.073 0.089 VGS = 4.5 V, ID = 2.8 A N-Ch 0.052 0.065 VGS = - 4.5 V, ID = - 2.5 A P-Ch 0.113 0.140 VDS = 15 V, ID = 2.5 A N-Ch 7 VDS = - 15 V, ID = - 3.5 A P-Ch 7 S Dynamica Input Capacitance Ciss Output Capacitance Coss Reverse Transfer Capacitance Total Gate Charge Gate-Source Charge Crss Qg N-Channel VDS = 15 V, VGS = 0 V, f = 1 MHz P-Channel VDS = - 15 V, VGS = 0 V, f = 1 MHz 305 P-Ch 340 N-Ch 65 P-Ch 67 N-Ch 29 P-Ch 51 pF VDS = 15 V, VGS = 10 V, ID = 2.5 A N-Ch 6 9 VDS = - 15 V, VGS = - 10 V, ID = - 2.5 A P-Ch 7.8 12 N-Ch 2.75 4.5 N-Channel VDS = 15 V, VGS = 4.5 V ID = 2.5 A P-Ch 4.1 6.2 N-Ch 1.3 P-Ch 1.3 N-Ch 0.9 P-Ch 1.8 Qgs Gate-Drain Charge Qgd P-Channel VDS = - 15 V, VGS = - 4.5 V, ID = - 2.5 A Gate Resistance Rg f = 1 MHz www.vishay.com 2 N-Ch N-Ch 0.6 3.1 6.2 P-Ch 2.0 10 20 nC Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 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 Si4532CDY Vishay Siliconix SPECIFICATIONS (TJ = 25 °C, unless otherwise noted) Parameter Dynamic Symbol Test Conditions Min. Typ.a Max. Unit a Turn-On Delay Time td(on) tr Rise Time Turn-Off Delay Time td(off) tf Fall Time Turn-On Delay Time td(on) tr Rise Time Turn-Off Delay Time P-Channel VDD = - 15 V, RL = 15 ID - 1 A, VGEN = - 10 V, Rg = 1 N-Channel VDD = 15 V, RL = 15 ID 1 A, VGEN = 4.5 V, Rg = 1 tf P-Channel VDD = - 15 V, RL = 15 ID - 1 A, VGEN = - 4.5 V, Rg = 1 IS TC = 25 °C td(off) Fall Time N-Channel VDD = 15 V, RL = 15 ID 1 A, VGEN = 10 V, Rg = 1 N-Ch 7 11 P-Ch 5.5 10 N-Ch 12 18 P-Ch 13 25 N-Ch 14 25 P-Ch 17 30 N-Ch 6 10 P-Ch 7.7 15 N-Ch 16 30 60 P-Ch 40 N-Ch 16 30 P-Ch 40 60 N-Ch 9 18 P-Ch 20 40 N-Ch 9 18 P-Ch 17 30 ns Drain-Source Body Diode Characteristics Continuous Source-Drain Diode Current Pulse Diode Forward Currenta Body Diode Voltage ISM N-Ch 2.3 P-Ch - 2.3 N-Ch 24 P-Ch VSD A - 12 IS = 1.25 A N-Ch 0.8 1.2 IS = - 0.75 A P-Ch - 0.8 - 1.2 N-Ch 14 21 P-Ch 17 30 Body Diode Reverse Recovery Time trr Body Diode Reverse Recovery Charge Qrr N-Channel IF = 1.25 A, dI/dt = 100 A/µs, TJ = 25 °C N-Ch 6 10 P-Ch 11 20 Reverse Recovery Fall Time ta P-Channel IF = - 2.5 A, dI/dt = - 100 A/µs, TJ = 25 °C N-Ch 9 P-Ch 12 Reverse Recovery Rise Time tb N-Ch 5 P-Ch 5 V ns nC ns Notes: a. Guaranteed by design, not subject to production testing. b. Pulse test; pulse width 300 µs, duty cycle 2 %. 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. Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 www.vishay.com 3 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 Si4532CDY Vishay Siliconix N-CHANNEL TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 1.2 24 1.0 VGS = 10 V thru 6 V I D - Drain Current (A) I D - Drain Current (A) 18 VGS = 5 V 12 0.8 0.6 TC = 25 °C 0.4 6 TC = 125 °C 0.2 VGS = 4 V TC = - 55 °C 0.0 0 0 2 4 6 8 0 10 1 2 3 4 5 VGS - Gate-to-Source Voltage (V) VDS - Drain-to-Source Voltage (V) Output Characteristics Transfer Characteristics 0.10 400 Ciss 300 0.06 C - Capacitance (pF) R DS(on) - On-Resistance () 350 0.08 VGS = 4.5 V VGS = 10 V 0.04 250 200 150 100 Coss 0.02 Crss 50 0.00 0 0 2 4 6 8 10 12 14 16 0 10 15 20 25 ID - Drain Current (A) VDS - Drain-to-Source Voltage (V) On-Resistance vs. Drain Current and Gate Voltage Capacitance 30 1.7 10 ID = 2.5 A ID = 6 A VDS = 7.5 V 1.5 8 VDS = 15 V 6 VDS = 22.5 V 4 VGS = 10 V (Normalized) R DS(on) - On-Resistance VGS - Gate-to-Source Voltage (V) 5 1.3 VGS = 4.5 V 1.1 0.9 2 0 0 2 4 Qg - Total Gate Charge (nC) Gate Charge www.vishay.com 4 6 0.7 - 50 - 25 0 25 50 75 100 125 150 TJ - Junction Temperature (°C) On-Resistance vs. Junction Temperature Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 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 Si4532CDY Vishay Siliconix N-CHANNEL TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 0.25 TJ = 150 °C R DS(on) - On-Resistance (Ω) I S - Source Current (A) 10 TJ = 25 °C 1 0.20 0.15 0.10 TJ = 125 °C 0.05 TJ = 25 °C 0.1 0.0 0.00 0.2 0.4 0.6 0.8 1.0 0 1.2 1 VSD - Source-to-Drain Voltage (V) 2 3 4 5 6 7 8 9 10 VGS - Gate-to-Source Voltage (V) Source-Drain Diode Forward Voltage On-Resistance vs. Gate-to-Source Voltage 0.4 50 0.2 40 0.0 Power (W) V GS(th) Variance (V) ID = 250 µA - 0.2 30 20 - 0.4 10 - 0.6 - 0.8 - 50 - 25 0 25 50 75 100 TJ - Temperature (°C) 125 0 0.001 150 0.01 0.1 1 10 Time (s) Threshold Voltage Single Pulse Power, Junction-to-Ambient 100 I D - Drain Current (A) Limited by RDS(on)* 10 µs 100 µs 10 1 ms 1 10 ms TA = 25 °C Single Pulse 100 ms 0.1 BVDSS Limited 0.01 0.1 1 1s 10 s 100 s, DC 10 100 VDS - Drain-to-Source Voltage (V) * VGS > minimum VGS at which RDS(on) is specified Safe Operating Area, Junction-to-Ambient Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 www.vishay.com 5 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 Si4532CDY Vishay Siliconix N-CHANNEL TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 8 I D - Drain Current (A) 6 Package Limited 4 2 0 0 25 50 75 100 125 150 TC - Case Temperature (°C) 3.5 1.5 2.8 1.2 2.1 0.9 Power (W) Power (W) Current Derating* 1.4 0.6 0.3 0.7 0.0 0.0 0 25 50 75 100 125 TC - Case Temperature (°C) Power Derating, Junction-to-Foot 150 0 25 50 75 100 125 150 TA - Ambient Temperature (°C) Power Derating, Junction-to-Ambient * The power dissipation PD is based on TJ(max) = 150 °C, using junction-to-case thermal resistance, and is more useful in settling the upper dissipation limit for cases where additional heatsinking is used. It is used to determine the current rating, when this rating falls below the package limit. www.vishay.com 6 Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 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 Si4532CDY Vishay Siliconix N-CHANNEL TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 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 = 120 °C/W 0.02 3. TJM - T A = PDMZthJA(t) Single Pulse 0.01 10 -4 10 -3 4. Surface Mounted 10 -2 10 -1 1 100 10 1000 Square Wave Pulse Duration (s) Normalized Thermal Transient Impedance, Junction-to-Ambient 1 Normalized Effective Transient Thermal Impedance Duty Cycle = 0.5 0.2 0.1 0.1 0.05 0.02 Single Pulse 0.01 10 -4 10 -3 10 -2 10 -1 1 10 Square Wave Pulse Duration (s) Normalized Thermal Transient Impedance, Junction-to-Foot Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 www.vishay.com 7 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 Si4532CDY Vishay Siliconix P-CHANNEL TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 15 2.0 VGS = 5 V VGS = 10 V thru 6 V I D - Drain Current (A) I D - Drain Current (A) 12 9 VGS = 4 V 6 1.5 1.0 TC = 25 °C 0.5 3 TC = 125 °C VGS = 3 V TC = - 55 °C 0 0.0 0.5 1.0 1.5 0.0 1.0 2.0 1.5 VDS - Drain-to-Source Voltage (V) 2.0 3.0 3.5 4.0 VGS - Gate-to-Source Voltage (V) Output Characteristics Transfer Characteristics 0.20 600 0.15 450 C - Capacitance (pF) R DS(on) - On-Resistance (Ω) 2.5 VGS = 4.5 V 0.10 VGS = 10 V Ciss 300 0.05 150 0.00 0 Coss Crss 0 3 6 9 12 15 0 12 18 24 ID - Drain Current (A) VDS - Drain-to-Source Voltage (V) On-Resistance vs. Drain Current and Gate Voltage Capacitance 10 30 1.8 ID = 2.5 A ID = 3.2 A VDS = 15 V VGS = 10 V 1.6 8 VDS = 7.5 V 6 VDS = 22.5 V 4 2 1.4 (Normalized) R DS(on) - On-Resistance VGS - Gate-to-Source Voltage (V) 6 VGS = 4.5 V 1.2 1.0 0.8 0 0 2 4 6 Qg - Total Gate Charge (nC) Gate Charge www.vishay.com 8 8 0.6 - 50 - 25 0 25 50 75 100 125 150 TJ - Junction Temperature (°C) On-Resistance vs. Junction Temperature Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 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 Si4532CDY Vishay Siliconix P-CHANNEL TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 0.4 10 ID = 3.5 A R DS(on) - On-Resistance (Ω) I S - Source Current (A) TJ = 25 °C 1 TJ = 150 °C 0.1 TJ = - 50 °C 0.01 0.3 0.2 TJ = 125 °C 0.1 TJ = 25 °C 0.0 0.001 0.0 0.3 0.6 0.9 1.2 0 1.5 2 VSD - Source-to-Drain Voltage (V) 6 8 10 VGS - Gate-to-Source Voltage (V) Source-Drain Diode Forward Voltage On-Resistance vs. Gate-to-Source Voltage 0.6 50 0.4 40 ID = 250 µA ID = 1 mA 0.2 0.0 -0.2 -0.4 - 50 Power (W) VGS(th) Variance (V) 4 30 20 10 - 25 0 25 50 75 100 125 150 0 0.001 0.01 TJ - Temperature (°C) 0.1 1 10 Time (s) Single Pulse Power, Junction-to-Ambient Threshold Voltage 100 I D - Drain Current (A) Limited by RDS(on)* 10 µs 100 µs 10 1 ms 1 10 ms TA = 25 °C Single Pulse 100 ms 0.1 1s 10 s 100 s, DC BVDSS Limited 0.01 0.1 1 10 100 VDS - Drain-to-Source Voltage (V) * VGS > minimum VGS at which RDS(on) is specified Safe Operating Area, Junction-to-Ambient Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 www.vishay.com 9 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 Si4532CDY Vishay Siliconix P-CHANNEL TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 5 I D - Drain Current (A) 4 3 2 1 0 0 25 50 75 100 125 150 TC - Case Temperature (°C) 3.5 1.5 2.8 1.2 2.1 0.9 Power (W) Power (W) Current Derating* 1.4 0.6 0.3 0.7 0.0 0.0 0 25 50 75 100 125 150 0 25 50 75 100 125 TC - Case Temperature (°C) TA - Ambient Temperature (°C) Power Derating, Junction-to-Foot Power Derating, Junction-to-Ambient 150 * The power dissipation PD is based on TJ(max) = 150 °C, using junction-to-case thermal resistance, and is more useful in settling the upper dissipation limit for cases where additional heatsinking is used. It is used to determine the current rating, when this rating falls below the package limit. www.vishay.com 10 Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 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 Si4532CDY Vishay Siliconix P-CHANNEL TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 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 = 110 °C/W 0.02 3. TJM - T A = PDMZthJA(t) Single Pulse 0.01 10 -4 10 -3 4. Surface Mounted 10 -2 10 -1 1 100 10 1000 Square Wave Pulse Duration (s) Normalized Thermal Transient Impedance, Junction-to-Ambient 1 Normalized Effective Transient Thermal Impedance Duty Cycle = 0.5 0.2 0.1 0.1 0.05 0.02 Single Pulse 0.01 10 -4 10 -3 10 -2 10 -1 1 10 Square Wave Pulse Duration (s) Normalized Thermal Transient Impedance, Junction-to-Foot 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?64805. Document Number: 64805 S11-0652-Rev. B, 11-Apr-11 www.vishay.com 11 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 Vishay Siliconix SOIC (NARROW): 8-LEAD JEDEC Part Number: MS-012 8 6 7 5 E 1 3 2 H 4 S h x 45 D C 0.25 mm (Gage Plane) A e B All Leads q A1 L 0.004" MILLIMETERS INCHES DIM Min Max Min Max A 1.35 1.75 0.053 0.069 A1 0.10 0.20 0.004 0.008 B 0.35 0.51 0.014 0.020 C 0.19 0.25 0.0075 0.010 D 4.80 5.00 0.189 0.196 E 3.80 4.00 0.150 e 0.101 mm 1.27 BSC 0.157 0.050 BSC H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.50 0.93 0.020 0.037 q 0° 8° 0° 8° S 0.44 0.64 0.018 0.026 ECN: C-06527-Rev. I, 11-Sep-06 DWG: 5498 Document Number: 71192 11-Sep-06 www.vishay.com 1 VISHAY SILICONIX TrenchFET® Power MOSFETs Application Note 808 Mounting LITTLE FOOT®, SO-8 Power MOSFETs Wharton McDaniel Surface-mounted LITTLE FOOT power MOSFETs use integrated circuit and small-signal packages which have been been modified to provide the heat transfer capabilities required by power devices. Leadframe materials and design, molding compounds, and die attach materials have been changed, while the footprint of the packages remains the same. See Application Note 826, Recommended Minimum Pad Patterns With Outline Drawing Access for Vishay Siliconix MOSFETs, (http://www.vishay.com/ppg?72286), for the basis of the pad design for a LITTLE FOOT SO-8 power MOSFET. In converting this recommended minimum pad to the pad set for a power MOSFET, designers must make two connections: an electrical connection and a thermal connection, to draw heat away from the package. 0.288 7.3 0.050 1.27 0.196 5.0 0.027 0.69 0.078 1.98 0.2 5.07 Figure 1. Single MOSFET SO-8 Pad Pattern With Copper Spreading Document Number: 70740 Revision: 18-Jun-07 0.050 1.27 0.088 2.25 0.088 2.25 0.027 0.69 0.078 1.98 0.2 5.07 Figure 2. Dual MOSFET SO-8 Pad Pattern With Copper Spreading The minimum recommended pad patterns for the single-MOSFET SO-8 with copper spreading (Figure 1) and dual-MOSFET SO-8 with copper spreading (Figure 2) show the starting point for utilizing the board area available for the heat-spreading copper. To create this pattern, a plane of copper overlies the drain pins. The copper plane connects the drain pins electrically, but more importantly provides planar copper to draw heat from the drain leads and start the process of spreading the heat so it can be dissipated into the ambient air. These patterns use all the available area underneath the body for this purpose. Since surface-mounted packages are small, and reflow soldering is the most common way in which these are affixed to the PC board, “thermal” connections from the planar copper to the pads have not been used. Even if additional planar copper area is used, there should be no problems in the soldering process. The actual solder connections are defined by the solder mask openings. By combining the basic footprint with the copper plane on the drain pins, the solder mask generation occurs automatically. A final item to keep in mind is the width of the power traces. The absolute minimum power trace width must be determined by the amount of current it has to carry. For thermal reasons, this minimum width should be at least 0.020 inches. The use of wide traces connected to the drain plane provides a low impedance path for heat to move away from the device. www.vishay.com 1 APPLICATION NOTE In the case of the SO-8 package, the thermal connections are very simple. Pins 5, 6, 7, and 8 are the drain of the MOSFET for a single MOSFET package and are connected together. In a dual package, pins 5 and 6 are one drain, and pins 7 and 8 are the other drain. For a small-signal device or integrated circuit, typical connections would be made with traces that are 0.020 inches wide. Since the drain pins serve the additional function of providing the thermal connection to the package, this level of connection is inadequate. The total cross section of the copper may be adequate to carry the current required for the application, but it presents a large thermal impedance. Also, heat spreads in a circular fashion from the heat source. In this case the drain pins are the heat sources when looking at heat spread on the PC board. 0.288 7.3 Application Note 826 Vishay Siliconix RECOMMENDED MINIMUM PADS FOR SO-8 0.172 (4.369) 0.028 0.022 0.050 (0.559) (1.270) 0.152 (3.861) 0.047 (1.194) 0.246 (6.248) (0.711) Recommended Minimum Pads Dimensions in Inches/(mm) Return to Index APPLICATION NOTE Return to Index www.vishay.com 22 Document Number: 72606 Revision: 21-Jan-08 Legal Disclaimer Notice Vishay Disclaimer ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any product. Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special, consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose, non-infringement and merchantability. Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular product with the properties described in the product specification is suitable for use in a particular application. Parameters provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed therein. Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining applications or for any other application in which the failure of the Vishay product could result in personal injury or death. Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners. Document Number: 91000 Revision: 11-Mar-11 www.vishay.com 1