SMCT TA32N14A10 Advanced Pulse Power Device N-MOS VCS, ThinPakTM Description Package This voltage controlled Solidtron (VCS) discharge switch utilizes an n-type MOS-Controlled Thyristor mounted on a ThinPakTM, ceramic "chip-scale" hybrid. Gate Return Bond Area Gate Bond Area Cathode Bond Area The VCS features the high peak current capability and low Onstate voltage drop common to SCR thyristors combined with extremely high dI/dt capability. This semiconductor is intended for the control of high power circuits with the use of very small amounts of input energy and is ideally suited for capacitor discharge applications. The ThinPakTM Package is a perforated, metalized ceramic substrate attached to the silicon using 302oC solder. An epoxy underfill is applied to protect the high voltage termination from debris. All exterior metal surfaces are tinned with 63pb/37sn solder providing the user with a circuit ready part. It's small size and low profile make it extremely attractive to high dI/dt applications where stray series inductance must be kept to a minimum. ThinPakTM Anode Bond Area Schematic Symbol Anode (A) Features l l l l 1400V Peak Off-State Voltage 32A Continuous Rating 4kA Surge Current Capability >100kA/uSec dI/dt Capability l l l l Gate (G) <100nSec Turn-On Delay Low On-State Voltage MOS Gated Control Low Inductance Package Gate Return (GR) Cathode (K) Absolute Maximum Ratings SYMBOL VALUE UNITS Peak Off-State Voltage VDRM 1400 V Peak Reverse Voltage VRRM -5 V Off-State Rate of Change of Voltage Immunity dv/dt 5000 V/uSec Continuous Anode Current at 110oC IA110 32 A Repetitive Peak Anode Current (Pulse Width=1uSec) IASM 4000 A Rate of Change of Current dI/dt 150 kA/uSec Continuous Gate-Cathode Voltage VGKS +/-20 V Peak Gate-Cathode Voltage VGKM +/-25 V Minimum Negative Gate-Cathode Voltage Required for Garanteed Off-State Maximum Junction Temperature VGK(OFF-MIN) -5 TJM 150 o 260 o Maximum Soldering Temperature (Installation) V C C This SILICON POWER product is protected by one or more of the following U.S. Patents: 5,521,436 5,585,310 5,248,901 5,366,932 5,497,013 5,532,635 5,446,316 5,557,656 5,564,226 5,517,058 4,814,283 5,135,890 5,105,536 5,777,346 5,446,316 5,577,656 5,473,193 5,166,773 5,209,390 5,139,972 5,103,290 5,028,987 5,304,847 5,569,957 4,958,211 5,111,268 5,260,590 5,350,935 5,640,300 5,184,206 5,206,186 5,757,036 5,777,346 5,995,349 4,801,985 4,476,671 4,857,983 4,888,627 4,912,541 5,424,563 5,399,892 5,468,668 5,082,795 4,980,741 4,941,026 4,927,772 4,739,387 4,648,174 4,644,637 4,374,389 4,750,666 4,429,011 5,293,070 SMCT TA32N14A10 Advanced Pulse Power Device N-MOS VCS, ThinPakTM Performance Characteristics Parameters TJ=25oC unless otherwise specified Symbol Anode to Cathode Breakdown Voltage Anode-Cathode Off-State Current V(BR) iD Measurements Test Conditions Min. VGK=-5, IA=1mA o TC=25 C o TC=150 C VGK(TH) VAK=VGK, IAK=1mA Gate-Cathode Leakage Current IGK(lkg) VGK=+/-20V Anode-Cathode On-State Voltage VT TC=25oC IT=32A, VGK=+5V o (See Figures 1,2 & 3) TC=150 C Turn-on Delay Time tD(ON) 0.2uF Capacitor Discharge dI/dt TJ=25oC, VGK= -5V to +5V IP V <10 100 uA 250 1000 uA 500 nA 1.5 2.0 V 1.3 1.5 50 VAK=800V, RG=4.7Ω A mJ 32 Turn-on Delay Time tD(ON) 50 Rate of Change of Current dI/dt TJ=150oC, VGK= -5V to +5V VAK=1200V, RG=4.7Ω nS kA/uSec 0.2uF Capacitor Discharge IP 100 75 LS= 7nH (See Figures 4,5 & 6) Peak Anode Current V nF 3500 EDIS Discharge Event Energy V 6 CISS Rate of Change of Current Units 0.7 Input Capacitance Peak Anode Current Max. 1400 VGE=-5V, VAK=1200V Gate-Cathode Turn-On Threshold Voltage Typ. 110 100 nS kA/uSec 4000 A Discharge Event Energy EDIS LS= 7nH (See Figures 4,5 & 6) Junction to Case Thermal Resistance RθJC Anode (bottom) side cooled (Note 1.) 0.08 Junction to Case Thermal Resistance RθJC Cathode-Gate (top) side cooled (Note 2.) 1.5 70 mJ o C/W o C/W Notes: 1. Case Exterior Assumed to be 0.002" of 63sn/37pb solder applied directly to Anode. (See Figure 7.) 2. Case Exterior Assummed to be 0.002" of 63sn/37pb solder applied directly to cathode bond area of thinPak. (See Figure 7.) Typical Performance Curves (unless otherwise specified) Figure 1. On-State Characteristics Figure 2. On-State Characteristics Figure 3. Predicted High Current On-State Characteristics SMCT TA32N14A10 Advanced Pulse Power Device N-MOS VCS, ThinPakTM Typical Performance Curves (Continued) Figure 4. Turn-On Delay Characteristics Figure 5. o RG=4.7Ω - 500Ω, TJ=25 C Figure 6. 0.2uF Discharge Pulse Performance Characteristics (See Figure 9.) Figure 7. Transient Thermal Impedance Response Turn-On Delay Characteristics RG=4.7Ω & 50Ω, TJ=25oC & 150oC SMCT TA32N14A10 Advanced Pulse Power Device N-MOS VCS, ThinPakTM Typical Performance Curves (Continued) Figure 8. Pulses to Failure (Pulse Widths < 100uSec) Test Circuit and Waveforms LSERIES (TOTAL) l LSERIES(TOTAL) is caculated using C=0.2uF + RG Gate Driver DUT - +5V 1 / (f 2π)2C where f = frequency of IA (See Figure 10) Supply Voltage l RSENSE is a calibrated Current Viewing Resistor (CVR) -5V RSENSE = 0.010Ω Figure 9. 0.2uF Pulsed Discharge Circuit Schematic TD(ON) 10% 0 Ref. VGK VAK 90% IP l The waveform shown is representative of one produced using a very low inductance circuit (<10nH). dI/dt - 10% to 50% of IA l VGK is held positive until IA oscillations have ended ( IA=0). IA Figure 10. 0.2uF Pulsed Discharge Circuit Waveforms 0 Ref. SMCT TA32N14A10 Advanced Pulse Power Device N-MOS VCS, ThinPakTM Application Notes A1. Junction Temperature Calculation The figure below shows a lump model of the thermal properties of the size 4 thinPak packaged VCS, from the 2-mil solder on the top of the lid on the left to the 2-mil solder on the bottom of the device on the right. By adding the user's lump model of the rest of the thermal system the user can calculate the junction and case temperature rise under any operating condition. Cathode-Gate (Top) Side Interface Anode (Bottom) Side Interface Device Junction A2. Calculation of Pulses to Failure for Intermediate/Long Pulse Widths The user may calculate the Number of Pulses to failure (NF) for long to intermedeiate pulse widths (not covered in the typical performance curve section) by applying the junction temperature rise (dT), calculated as described in A1, to the formula NF=(300/dT)9 . A3. Use of Gate Return Bond Area. The MCT was designed for high di/dt applications. An independent cathode connection or "Gate Return Bond Area" was provided to minimize the effects of rapidly changing Anode-Cathode current on the Gate control voltage, (V=L*di/dt). It is therefore, critcal that the user utilize the Gate Return Bond Area as the point at which the gate driver reference (return) is attached to the VCS device. Packaging and Handling Package Dimensions 1. All metal surfaces are tinned using 63pb/37sn solder. Top Cathode-Gate 2. Installation reflow temperature should not exceed 260oC or internal package degradation may result. 3. Package may be cooled from either top or bottom (See Figures 7 & A1 Application Notes.) 4. As with all MOS gated devices, proper handling procedures must be observed to prevent electrostatic discharge which may result in permanent damage to the gate of the device Side Bottom Anode