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Vishay General Semiconductor - Diodes Division 3KASMC20AHE3_B/I
- Part No.:
- 3KASMC20AHE3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC20AHE3_B/I.pdf
- Description:
- TVS DIODE 20VWM 32.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,005
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Product details
Overview
3KASMC20AHE3_B/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 20 V stand-off voltage, 22.2–24.5 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 µs), 92.6 A peak surge current, and 32.4 V clamping voltage at IPPM - used to protect automotive sensor signal lines and MOSFET gates against inductive switching transients.
For engineers reviewing the 3KASMC20AHE3_B/I datasheet, 3KASMC20AHE3_B/I pinout, 3KASMC20AHE3_B/I application, or 3KASMC20AHE3_B/I equivalent, key selection criteria include unidirectional polarity, 185 °C junction rating, AEC-Q101 qualification, RoHS-compliant HE3 suffix, and SMC package thermal performance under high-reliability automotive conditions.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology with junction passivation optimized for high-temperature stability. It delivers 3000 W peak pulse power handling per 10/1000 µs waveform and maintains clamping performance up to TJ = 185 °C.
Designed exclusively for unidirectional operation, it features low incremental surge resistance and fast response time to suppress transients before sensitive downstream components are damaged. Its thermal resistance is RθJA = 77.5 °C/W (typ.) and RθJL = 18.3 °C/W (typ.), enabling robust power dissipation on standard PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/typ/max) | 22.2 / 23.4 / 24.5 V at IT = 1 mA - ensures reliable breakdown onset within tight tolerance band |
| VC @ IPPM | 32.4 V - clamping voltage at 92.6 A surge, limiting stress on protected ICs |
| PPPM | 3000 W - peak transient energy absorption capability per 10/1000 µs waveform |
| TJ max. | +185 °C - enables use in under-hood automotive environments without derating |
| AEC-Q101 | Qualified - validated for automotive-grade reliability per stress test requirements |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 7.11 mm x 6.60 mm body and matte tin leads |
Pinout & Package
Package: SMC (DO-214AB), molded case meeting UL 94 V-0 flammability rating; matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction or clamping | Connected to ground or low-side reference in unidirectional TVS configuration |
| Cathode | Current exit terminal during clamping; marked with color band | Connected to protected line (e.g., sensor output, gate drive) to shunt transients to ground |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure improves long-term reliability under thermal cycling and humidity |
| High-temperature operation | Rated for continuous operation up to +185 °C junction temperature, supporting under-hood automotive placement |
| Peak pulse power | 3000 W capability enables suppression of severe load-dump and inductive kick events without failure |
| Clamping performance | Low VC/VBR ratio (≈1.38) ensures minimal overvoltage exposure to protected circuitry during surge |
| Manufacturing compliance | RoHS-compliant HE3 suffix with MSL Level 1 rating and JESD 201 Class 2 whisker resistance |
Applications
| Automotive Sensor Protection | Industrial Motor Drive Gate Protection |
|---|---|
Use Scenario: Protecting analog output lines of pressure, temperature, or position sensors in engine control units exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor output and microcontroller ADC input to limit transient voltage to safe levels. Use Value: Prevents latch-up or damage to 3.3 V or 5 V ADC inputs while maintaining signal integrity via low leakage (<1 μA at 20 V). | Use Scenario: Safeguarding high-side and low-side MOSFET gate drivers in BLDC motor inverters subject to cross-conduction spikes and Miller-induced ringing. IC Role / Device Role / Timing Role: TVS placed across gate-source terminals to clamp dv/dt-induced overshoot and prevent unintended turn-on. Use Value: Enables reliable gate drive operation at 20 V VGS rating with 32.4 V clamping, avoiding gate oxide breakdown during fast-switching events. |
| Telecom Line Interface Protection | Computer Power Rail Transient Suppression |
Use Scenario: Shielding RS-485 transceiver I/O pins in base station backhaul modules from ESD and lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Unidirectional TVS connected between differential pair and local ground to absorb common-mode transients without affecting DC bias. Use Value: Meets IEC 61000-4-2 Level 4 (±15 kV contact) and IEC 61000-4-5 (1 kV line-earth) when combined with series impedance. | Use Scenario: Protecting 20 V auxiliary rails feeding FPGAs or PMICs in server motherboards during hot-swap and power sequencing events. IC Role / Device Role / Timing Role: TVS installed at rail entry point to clamp inrush-induced overshoot and regulator instability spikes. Use Value: Withstands 200 A IFSM (8.3 ms half-sine) and provides 6.0 W steady-state dissipation, ensuring rail stability during repeated power cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20AHE3_A/H | Lower PPPM (400 W), same VWM (20 V), smaller SMA package (RθJA = 110 °C/W) | Not suitable for 3000 W surge events; limited to lower-energy transients in space-constrained consumer designs | Select only if system-level testing confirms <400 W transient threat level and board area is critical |
| SMCJ20AHE3_A/H | Same SMC package, identical VWM/VC/PPPM specs, but non-AEC-Q101 qualified and no HE3 whisker rating | Lacks automotive qualification; acceptable for industrial/commercial use where AEC-Q101 is not mandated | Choose when cost sensitivity outweighs automotive reliability requirements and JEDEC whisker compliance is optional |
Compared with SMAJ20AHE3_A/H and SMCJ20AHE3_A/H, the 3KASMC20AHE3_B/I offers guaranteed AEC-Q101 qualification, JESD 201 Class 2 whisker resistance, and 3000 W surge capacity in the SMC footprint - making it the only option qualified for high-energy, high-reliability automotive signal line protection.
Availability
3KASMC20AHE3_B/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial motor drives, telecom line interfaces, and computer power rail protection requiring stable component supply across extended temperature and surge conditions.
Supply support for 3KASMC20AHE3_B/I includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, TVS devices, and optoelectronics with emphasis on reliability, thermal performance, and automotive qualification.
The 3KASMCxxA family is designed specifically for high-energy transient suppression in harsh environments - targeting AEC-Q101-compliant automotive subsystems, industrial controls, and infrastructure equipment where 3000 W surge immunity and 185 °C operation are mandatory.
FAQ
What is the clamping voltage of the 3KASMC20AHE3_B/I at its rated peak pulse current?
The 3KASMC20AHE3_B/I has a maximum clamping voltage (VC) of 32.4 V at its peak pulse current (IPPM) of 92.6 A, measured using the standardized 10/1000 µs waveform. This value ensures protected circuits remain below critical overvoltage thresholds during surge events. The 3KASMC20AHE3_B/I's low VC/VBR ratio supports robust protection margin for 3.3 V and 5 V logic interfaces.
Is the 3KASMC20AHE3_B/I qualified for automotive applications?
Yes, the 3KASMC20AHE3_B/I is AEC-Q101 qualified, as confirmed by Vishay's documentation for the HE3 suffix variant. It meets all stress tests required for automotive-grade reliability, including temperature cycling, humidity bias, and high-temperature operating life. The 3KASMC20AHE3_B/I is explicitly intended for use in engine control, ADAS, and body electronics systems.
What does the "HE3" suffix indicate in 3KASMC20AHE3_B/I?
The "HE3" suffix in 3KASMC20AHE3_B/I denotes a RoHS-compliant, AEC-Q101-qualified version with matte tin-plated leads that pass JESD 201 Class 2 whisker testing. The "B" indicates revision level, and "I" specifies packaging in 13-inch tape-and-reel format (3500 units per reel). The 3KASMC20AHE3_B/I is not halogen-free - that designation applies only to HM3 suffix variants.
Can the 3KASMC20AHE3_B/I be used in bidirectional configurations?
No, the 3KASMC20AHE3_B/I is unidirectional only, as stated in the Vishay datasheet. It conducts in reverse-bias during clamping and blocks forward current above VF ≈ 3.5 V. For bidirectional protection, a separate device such as the SMBJ20CAHE3_B/I would be required. Using two 3KASMC20AHE3_B/I devices in series opposition is not recommended due to mismatched VBR tolerances and undefined behavior under fast transients.
What is the thermal resistance from junction to ambient for the 3KASMC20AHE3_B/I?
The typical thermal resistance from junction to ambient (RθJA) for the 3KASMC20AHE3_B/I is 77.5 °C/W, measured on the minimum recommended pad layout per the datasheet. This value assumes standard FR-4 PCB with copper pour; actual performance may vary with layout, airflow, and adjacent heat sources. The 3KASMC20AHE3_B/I also exhibits RθJL = 18.3 °C/W to leads, supporting effective conduction cooling through solder joints.
3KASMC20AHE3_B/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 92.6A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
3KASMC20AHE3_B/I FAQ
1.How can I place an order for 3KASMC20AHE3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC20AHE3_B/I on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 3KASMC20AHE3_B/I reliable?
The price and inventory of 3KASMC20AHE3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC20AHE3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC20AHE3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC20AHE3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC20AHE3_B/I?
3KASMC20AHE3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC20AHE3_B/I order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 3KASMC20AHE3_B/I?
For technical support, including 3KASMC20AHE3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC20AHE3_B/I requirements.
6.How does Aetrix verify that 3KASMC20AHE3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC20AHE3_B/I products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 3KASMC20AHE3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC20AHE3_B/I?
All 3KASMC20AHE3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC20AHE3_B/I, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 3KASMC20AHE3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC20AHE3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC20AHE3_B/I Tags
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