Si8439DB www.vishay.com Vishay Siliconix P-Channel 8 V (D-S) MOSFET FEATURES PRODUCT SUMMARY RDS(on) () MAX. ID (A) a, e 0.025 at VGS = -4.5 V -9.2 VDS (V) -8 0.030 at VGS = -2.5 V -8.4 0.037 at VGS = -1.8 V -7.6 0.061 at VGS = -1.5 V -5.9 0.125 at VGS = -1.2 V -1 Qg (TYP.) • TrenchFET® power MOSFET: 1.2 V rated • Ultra-small 1.6 mm x 1.6 mm maximum outline • Ultra-thin 0.6 mm maximum height • Material categorization: for definitions of compliance please see www.vishay.com/doc?99912 33 APPLICATIONS MICRO FOOT® 1.6 x 1.6 D 3 6 1. 9 843xx x m m 1 1.6 Backside View S • Low threshold load portable devices D 2 switch - Low power consumption for G - Increased battery life mm • Ultra low voltage load switch 1 G 4 S Bump Side View D Marking Code: 8439 P-Channel MOSFET Ordering Information: Si8439DB-T1-E1 (lead (Pb)-free and halogen-free) ABSOLUTE MAXIMUM RATINGS (TA = 25 °C, unless otherwise noted) PARAMETER SYMBOL LIMIT Drain-Source Voltage VDS -8 Gate-Source Voltage VGS ±5 TA = 70 °C TA = 25 °C ID Continuous Source-Drain Diode Current Maximum Power Dissipation IDM TA = 25 °C TA = 25 °C IS -5.9 b -2.3 a -0.92 b 2.7 a TA = 70 °C 1.8 a TA = 25 °C PD Operating Junction and Storage Temperature Range A -25 TA = 25 °C 1.1 b W 0.73 b TA = 70 °C Package Reflow Conditions c -7.4 a -4.7 b TA = 70 °C Pulsed Drain Current (t = 300 μs) V -9.2 a TA = 25 °C Continuous Drain Current (TJ = 150 °C) UNIT TJ, Tstg -55 to +150 VPR 260 IR / convection 260 °C Notes a. Surface mounted on 1" x 1" FR4 board with full copper, t = 5 s. b. Surface mounted on 1" x 1" FR4 board with minimum copper, t = 5 s. c. Refer to IPC / JEDEC® (J-STD-020), no manual or hand soldering. d. In this document, any reference to case represents the body of the MICRO FOOT device and foot is the bump. e. Based on TA = 25 °C. S15-1692-Rev. C, 20-Jul-15 Document Number: 63839 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 Si8439DB www.vishay.com Vishay Siliconix THERMAL RESISTANCE RATINGS PARAMETER SYMBOL TYPICAL MAXIMUM Maximum Junction-to-Ambient a, b t=5s RthJA 35 45 Maximum Junction-to-Ambient c, d t=5s RthJA 85 110 UNIT °C/W Notes a. Surface mounted on 1" x 1" FR4 board with full copper, t = 5 s. b. Maximum under steady state conditions is 85 °C/W. c. Surface mounted on 1" x 1" FR4 board with minimum copper, t = 5 s. d. Maximum under steady state conditions is 175 °C/W. SPECIFICATIONS (TJ = 25 °C, unless otherwise noted) PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX. UNIT VDS VGS = 0 V, ID = -250 μA -8 - - V - -3 - - 2.5 - Static Drain-Source Breakdown Voltage VDS Temperature Coefficient VDS/TJ VGS(th) Temperature Coefficient VGS(th)/TJ ID = -250 μA Gate-Source Threshold Voltage mV/°C VGS(th) VDS = VGS, ID = -250 μA -0.4 - -0.8 V Gate-Source Leakage IGSS VDS = 0 V, VGS = ± 5 V - - ± 100 nA Zero Gate Voltage Drain Current IDSS On-State Drain Current a ID(on) Drain-Source On-State Resistance a RDS(on) Forward Transconductance a gfs VDS = -8 V, VGS = 0 V - - -1 VDS= -8 V, VGS = 0 V, TJ = 70 °C - - -10 VDS -5 V, VGS = -4.5 V -5 - - VGS = -4.5 V, ID = -1.5 A - 0.020 0.025 VGS = -2.5 V, ID = -1 A - 0.023 0.030 VGS = -1.8 V, ID = -1 A - 0.030 0.037 VGS = -1.5 V, ID = -1 A - 0.036 0.061 VGS = -1.2 V, ID = -0.5 A - 0.070 0.125 VDS = -4 V, ID = -1.5 A - 14 - - 33 50 VDS = -4 V, VGS = -4.5 V, ID = -1.5 A - 3.5 - - 7.2 - VGS = -0.1 V, f = 1 MHz - 27 - - 30 60 μA A S Dynamic b Total Gate Charge Qg Gate-Source Charge Qgs Gate-Drain Charge Qgd Gate Resistance Rg Turn-On Delay Time td(on) Rise Time Turn-Off Delay Time tr td(off) Fall Time VDD = -4 V, RL = 2.7 ID -1.5 A, VGEN = -4.5 V, Rg = 1 tf nC - 25 50 - 330 660 - 210 420 - - -2.3 c - - -25 - -0.7 -1.2 V - 365 730 ns - 1.2 2.3 μC - 125 - - 240 - ns Drain-Source Body Diode Characteristics Continuous Source-Drain Diode Current IS Pulse Diode Forward Current ISM Body Diode Voltage VSD Body Diode Reverse Recovery Time trr Body Diode Reverse Recovery Charge Qrr Reverse Recovery Fall Time ta Reverse Recovery Rise Time tb TA = 25 °C IS = -1.5 A, VGS = 0 V IF = -1.5 A, dI/dt = 100 A/μs, TJ = 25 °C A ns Notes a. Pulse test; pulse width 300 μs, duty cycle 2 %. b. Guaranteed by design, not subject to production testing. c. Surface mounted on 1" x 1" FR4 board with full copper, t = 5 s. 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. S15-1692-Rev. C, 20-Jul-15 Document Number: 63839 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 Si8439DB www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 20 10 VGS = 5 V thru 2 V 8 ID - Drain Current (A) ID - Drain Current (A) 15 VGS = 1.5 V 10 6 TC = 25 °C 4 TC = 125 °C 5 2 VGS = 1 V 0 TC = - 55 °C 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 0.0 0.3 0.6 0.9 1.2 VGS - Gate-to-Source Voltage (V) VDS - Drain-to-Source Voltage (V) 1.5 Transfer Characteristics Output Characteristics 0.15 3000 VGS = 1.2 V Ciss C - Capacitance (pF) RDS(on) - On-Resistance (Ω) 2500 VGS = 1.5 V 0.12 0.09 0.06 VGS = 2.5 V VGS = 1.8 V 2000 1500 Coss 1000 Crss 0.03 500 VGS = 4.5 V 0.00 0 0 4 8 12 ID - Drain Current (A) 16 20 0 2 4 6 VDS - Drain-to-Source Voltage (V) Capacitance On-Resistance vs. Drain Current 1.3 6 RDS(on) - On-Resistance (Normalized) ID = 1.5 A VGS - Gate-to-Source Voltage (V) 8 VDS = 4 V 5 4 VDS = 2 V VDS = 6.4 V 3 2 1 0 0 10 20 30 40 Qg - Total Gate Charge (nC) Gate Charge S15-1692-Rev. C, 20-Jul-15 50 VGS = 4.5 V, 2.5 V; ID = 1.5 A 1.2 VGS = 1.8 V; ID = 1 A VGS = 1.5 V; ID = 1 A 1.1 1.0 0.9 VGS = 1.2 V; ID = 0.5 A 0.8 - 50 - 25 0 25 50 75 100 125 150 TJ - Junction Temperature (°C) On-Resistance vs. Junction Temperature Document Number: 63839 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 Si8439DB www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 0.10 100 ID = 1.5 A RDS(on) - On-Resistance (Ω) IS - Source Current (A) 0.08 10 TJ = 150 °C TJ = 25 °C 1 0.06 0.04 TJ = 125 °C 0.02 TJ = 25 °C 0.1 0.0 0.00 0.2 0.4 0.6 0.8 1.0 1.2 VSD - Source-to-Drain Voltage (V) 0 1.4 1 2 3 4 5 VGS - Gate-to-Source Voltage (V) Source-Drain Diode Forward Voltage On-Resistance vs. Gate-to-Source Voltage 0.8 80 0.7 0.6 Power (W) VGS(th) (V) 60 ID = 250 μA 0.5 20 0.4 0.3 - 50 40 - 25 0 25 50 75 100 125 150 0 0.001 0.01 TJ - Temperature (°C) Threshold Voltage 0.1 1 Time (s) 10 100 600 Single Pulse Power, Junction-to-Ambient 100 Limited by RDS(on)* ID - Drain Current (A) 10 1 ms 10 ms 1 100 ms 1s 10 s DC 0.1 TA = 25 °C 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 S15-1692-Rev. C, 20-Jul-15 Document Number: 63839 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 Si8439DB www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 1.5 8 1.2 Power (W) ID - Drain Current (A) 6 4 0.9 0.6 2 0.3 0.0 0 0 25 50 75 100 125 TA - Ambient Temperature (°C) Current Derating a 150 25 50 75 100 125 TA - Ambient Temperature (°C) 150 Power Derating Notes • When mounted on 1" x 1" FR4 with full copper. a. 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. S15-1692-Rev. C, 20-Jul-15 Document Number: 63839 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 Si8439DB www.vishay.com Vishay Siliconix TYPICAL CHARACTERISTICS (25 °C, unless otherwise noted) 2 Normalized Effective Transient Thermal Impedance 1 Duty Cycle = 0.5 0.2 Notes: 0.1 PDM 0.1 0.05 t1 t2 1. Duty Cycle, D = 0.02 t1 t2 2. Per Unit Base = RthJA = 85 °C/W 3. TJM - TA = PDMZthJA(t) Single Pulse 0.01 10 - 4 10 - 3 4. Surface Mounted 10 - 2 10 -1 1 Square Wave Pulse Duration (s) 10 100 600 Normalized Thermal Transient Impedance, Junction-to-Ambient (1" x 1" FR4 Board with Full Copper) 1 Normalized Effective Transient Thermal Impedance Duty Cycle = 0.5 0.2 Notes: 0.1 0.1 PDM 0.05 t1 t2 1. Duty Cycle, D = 0.02 t1 t2 2. Per Unit Base = RthJA = 175 °C/W 3. TJM - TA = PDMZthJA(t) 4. Surface Mounted Single Pulse 0.01 10 -3 10 -2 10 -1 1 Square Wave Pulse Duration (s) 10 100 1000 Normalized Thermal Transient Impedance, Junction-to-Ambient (1" x 1" FR4 Board with Minimum Copper) 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?63839. S15-1692-Rev. C, 20-Jul-15 Document Number: 63839 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 Package Information www.vishay.com Vishay Siliconix MICRO FOOT®: 4-Bumps (1.6 mm x 1.6 mm, 0.8 mm Pitch, 0.290 mm Bump Height) 4x Ø b1 4x 0.30 to .31 (Note 3) Solder mask-0.4 S Mark on backside of die D S G e e Recommended land pattern S XXX D e E XXXX S e S D b Note 5 A1 A A2 b1 K Notes 1. Bumps are 95.5/3.8/0.7 Sn/Ag/Cu. 2. Backside surface is coated with a Ti/Ni/Ag layer. 3. Non-solder mask defined copper landing pad. 4. Laser marks on the silicon die back. 5. “b1” is the diameter of the solderable substrate surface, defined by an opening in the solder resist layer solder mask defined. 6. • is the location of pin 1 DIM. MILLIMETERS INCHES MIN. NOM. MAX. MIN. NOM. MAX. A 0.550 0.575 0.600 0.0217 0.0226 0.0236 A1 0.260 0.275 0.290 0.0102 0.0108 0.0114 A2 0.290 0.300 0.310 0.0114 0.0118 0.0122 b 0.370 0.390 0.410 0.0146 0.0153 0.0161 b1 0.300 e 0.0118 0.800 0.0314 s 0.360 0.380 0.400 0.0141 0.0150 D 1.520 1.560 1.600 0.0598 0.0614 0.0157 0.0630 E 1.520 1.560 1.600 0.0598 0.0614 0.0630 K 0.155 0.185 0.215 0.0061 0.0073 0.0085 Note • Use millimeters as the primary measurement. ECN: T15-0175-Rev. A, 27-Apr-15 DWG: 6038 Revision: 27-Apr-15 1 Document Number: 69378 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 AN824 Vishay Siliconix PCB Design and Assembly Guidelines For MICRO FOOTr Products Johnson Zhao INTRODUCTION Vishay Siliconix’s MICRO FOOT product family is based on a wafer-level chip-scale packaging (WL-CSP) technology that implements a solder bump process to eliminate the need for an outer package to encase the silicon die. MICRO FOOT products include power MOSFETs, analog switches, and power ICs. For battery powered compact devices, this new packaging technology reduces board space requirements, improves thermal performance, and mitigates the parasitic effect typical of leaded packaged products. For example, the 6−bump MICRO FOOT Si8902EDB common drain power MOSFET, which measures just 1.6 mm x 2.4 mm, achieves the same performance as TSSOP−8 devices in a footprint that is 80% smaller and with a 50% lower height profile (Figure 1). A MICRO FOOT analog switch, the 6−bump DG3000DB, offers low charge injection and 1.4 W on−resistance in a footprint measuring just 1.08 mm x 1.58 mm (Figure 2). Vishay Siliconix MICRO FOOT products can be handled with the same process techniques used for high-volume assembly of packaged surface-mount devices. With proper attention to PCB and stencil design, the device will achieve reliable performance without underfill. The advantage of the device’s small footprint and short thermal path make it an ideal option for space-constrained applications in portable devices such as battery packs, PDAs, cellular phones, and notebook computers. This application note discusses the mechanical design and reliability of MICRO FOOT, and then provides guidelines for board layout, the assembly process, and the PCB rework process. FIGURE 1. 3D View of MICRO FOOT Products Si8902DB and Si8900EDB 3 2 1 0.18 ~ 0.25 A 1.08 0.5 B 0.285 0.285 0.5 1.58 FIGURE 2. Outline of MICRO FOOT CSP & Analog Switch DG3000DB Document Number: 71990 06-Jan-03 www.vishay.com 1 AN824 Vishay Siliconix TABLE 1 ÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Main Parameters of Solder Bumps in MICRO FOOT Designs MICRO FOOT CSP Bump Material MICRO FOOT CSP MOSFET Eutectic Solder: 63Sm/37Pb MICRO FOOT CSP Analog Switch MICRO FOOT UCSP Analog Switch Bump Pitch* Bump Diameter* Bump Height* 0.8 0.37-0.41 0.26-0.29 0.5 0.18-0.25 0.14-0.19 0.5 0.32-0.34 0.21-0.24 * All measurements in millimeters MICRO FOOT’S DESIGN AND RELIABILITY BOARD LAYOUT GUIDELINES As a mechanical, electrical, and thermal connection between the device and PCB, the solder bumps of MICRO FOOT products are mounted on the top active surface of the die. Table 1 shows the main parameters for solder bumps used in MICRO FOOT products. A silicon nitride passivation layer is applied to the active area as the last masking process in fabrication,ensuring that the device passes the pressure pot test. A green laser is used to mark the backside of the die without damaging it. Reliability results for MICRO FOOT products mounted on a FR-4 board without underfill are shown in Table 2. Board materials. Vishay Siliconix MICRO FOOT products are designed to be reliable on most board types, including organic boards such as FR-4 or polyamide boards. The package qualification information is based on the test on 0.5-oz. FR-4 and polyamide boards with NSMD pad design. TABLE 2 ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁ MICRO FOOT Reliability Results Test Condition C: −65_ to 150_C >500 Cycles Test condition B: −40_ to 125_C >1000 Cycles 121_C @ 15PSI 100% Humidity Test 96 Hours The main failure mechanism associated with wafer-level chip-scale packaging is fatigue of the solder joint. The results shown in Table 2 demonstrate that a high level of reliability can be achieved with proper board design and assembly techniques. Land patterns. Two types of land patterns are used for surface-mount packages. Solder mask defined (SMD) pads have a solder mask opening smaller than the metal pad (Figure 3), whereas on-solder mask defined (NSMD) pads have a metal pad smaller than the solder-mask opening (Figure 4). NSMD is recommended for copper etch processes, since it provides a higher level of control compared to SMD etch processes. A small-size NSMD pad definition provides more area (both lateral and vertical) for soldering and more room for escape routing on the PCB. By contrast, SMD pad definition introduces a stress concentration point near the solder mask on the PCB side that may result in solder joint cracking under extreme fatigue conditions. Copper pads should be finished with an organic solderability preservative (OSP) coating. For electroplated nickel-immersion gold finish pads, the gold thickness must be less than 0.5 mm to avoid solder joint embrittlement. Solder Mask Copper Copper FIGURE 3. SMD www.vishay.com 2 Solder Mask FIGURE 4. NSMD Document Number: 71990 06-Jan-03 AN824 Vishay Siliconix TABLE 3 Dimensions of Copper Pad and Solder Mask Opening in PCB and Stencil Aperture ÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁ Á ÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁÁÁÁ ÁÁÁÁÁ ÁÁÁÁÁ Pitch Copper Pad Solder Mask Opening Stencil Aperture 0.80 mm 0.30 " 0.01 mm 0.41 " 0.01 mm 0.33 " 0.01 mm in ciircle aperture 0.50 mm 0.17 " 0.01 mm 0.27 " 0.01 mm 0.30 " 0.01 mm in square aperture ASSEMBLY PROCESS MICRO FOOT products’ surface-mount-assembly operations include solder paste printing, component placement, and solder reflow as shown in the process flow chart (Figure 5). Chip pick-and-placement. MICRO FOOT products can be picked and placed with standard pick-and-place equipment. The recommended pick-and-place force is 150 g. Though the part will self-center during solder reflow, the maximum placement offset is 0.02 mm. Reflow Process. MICRO FOOT products can be assembled using standard SMT reflow processes. Similar to any other package, the thermal profile at specific board locations must be determined. Nitrogen purge is recommended during reflow operation. Figure 6 shows a typical reflow profile. Thermal Profile 250 200 Temperature (_C) Board pad design. The landing-pad size for MICRO FOOT products is determined by the bump pitch as shown in Table 3. The pad pattern is circular to ensure a symmetric, barrel-shaped solder bump. 150 100 50 Stencil Design IIncoming Tape and Reel Inspection 0 0 Solder Paste Printing 100 200 300 400 Time (Seconds Chip Placement FIGURE 6. Reflow Profile Reflow Solder Joint Inspection Pack and Ship FIGURE 5. SMT Assembly Process Flow PCB REWORK To replace MICRO FOOT products on PCB, the rework procedure is much like the rework process for a standard BGA or CSP, as long as the rework process duplicates the original reflow profile. The key steps are as follows: 1. Stencil design. Stencil design is the key to ensuring maximum solder paste deposition without compromising the assembly yield from solder joint defects (such as bridging and extraneous solder spheres). The stencil aperture is dependent on the copper pad size, the solder mask opening, and the quantity of solder paste. Remove the MICRO FOOT device using a convection nozzle to create localized heating similar to the original reflow profile. Preheat from the bottom. 2. Once the nozzle temperature is +190_C, use tweezers to remove the part to be replaced. 3. In MICRO FOOT products, the stencil is 0.125-mm (5-mils) thick. The recommended apertures are shown in Table 3 and are fabricated by laser cut. Resurface the pads using a temperature-controlled soldering iron. 4. Apply gel flux to the pad. 5. Use a vacuum needle pick-up tip to pick up the replacement part, and use a placement jig to placed it accurately. 6. Reflow the part using the same convection nozzle, and preheat from the bottom, matching the original reflow profile. Solder-paste printing. The solder-paste printing process involves transferring solder paste through pre-defined apertures via application of pressure. In MICRO FOOT products, the solder paste used is UP78 No-clean eutectic 63 Sn/37Pb type3 or finer solder paste. Document Number: 71990 06-Jan-03 www.vishay.com 3 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. 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. 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We confirm that all the products identified as being compliant to Directive 2002/95/EC conform to Directive 2011/65/EU. Vishay Intertechnology, Inc. hereby certifies that all its products that are identified as Halogen-Free follow Halogen-Free requirements as per JEDEC JS709A standards. Please note that some Vishay documentation may still make reference to the IEC 61249-2-21 definition. 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