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Vishay General Semiconductor - Diodes Division 3KASMC20HE3/57T
- Part No.:
- 3KASMC20HE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC20HE3/57T.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,749
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Product details
Overview
3KASMC20HE3/57T from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000 W peak pulse power (10/1000 μs), 20 V stand-off voltage (VWM), and 185 °C maximum junction temperature - designed for robust overvoltage protection of automotive power rails and high-reliability sensor interfaces.
For engineers reviewing the 3KASMC20HE3/57T datasheet, 3KASMC20HE3/57T pinout, 3KASMC20HE3/57T application, or 3KASMC20HE3/57T equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, clamping performance at IPPM, thermal resistance data, and real-world use context for industrial and automotive transient suppression design.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to achieve stable breakdown behavior under high-temperature stress (TJ up to 185 °C) and fast response to transients. Its unidirectional polarity and low incremental surge resistance enable precise clamping during inductive load switching events.
It meets MSL Level 1 per J-STD-020 with 260 °C reflow peak, uses matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and is qualified to AEC-Q101 for automotive under-hood applications requiring long-term reliability under thermal cycling and humidity exposure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum reverse working voltage before clamping begins; defines safe operating range for protected circuit. |
| VBR (min/max) | 22.2 V / 24.5 V at 1 mA - Confirmed breakdown threshold ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 32.4 V at 92.6 A - Clamping voltage under full 3000 W surge; limits downstream IC stress during ESD or load dump. |
| PPPM | 3000 W (10/1000 μs) - Peak surge power handling capability validated per ANSI/IEEE C62.35 standards. |
| TJ max. | 185 °C - Enables operation in under-hood automotive environments without derating penalties up to ambient 125 °C. |
| RθJA | 77.5 °C/W - Thermal resistance from junction to ambient on standard PCB pad layout; informs heatsinking requirements. |
| IFSM | 200 A (8.3 ms half-sine) - Surge current rating for short-duration inrush or fault conditions without failure. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, cathode indicated by color band. Molding compound complies with UL 94 V-0; terminals are matte tin plated.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to ground or low-side reference in unidirectional TVS configuration. | Provides low-impedance path to ground during reverse transient; must be routed with minimal inductance for effective clamping. |
| Cathode | Current exit terminal in forward bias; connected to protected line (e.g., 24 V rail or signal input). | Acts as the "input" side for transient energy absorption; color band marks this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock testing. |
| Junction passivation | Optimized die surface treatment prevents leakage drift and parametric shift after prolonged high-temperature operation. |
| MSL Level 1 rating | Supports standard SMT reflow profiles up to 260 °C peak without moisture-induced damage or popcorn effect. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage overshoot during surge events - critical for protecting 3.3 V or 5 V logic interfaces downstream. |
| Uni-directional architecture | Blocks reverse conduction while clamping positive transients only - ideal for DC power rail protection with defined polarity. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (up to 60 V, 100 ms) on 12 V/24 V vehicle battery lines feeding ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between power input and upstream fuse or DC-DC converter input. Use Value: Limits voltage seen by downstream regulators to ≤32.4 V during 3000 W surges, preventing latch-up or permanent damage to PMICs and microcontrollers. |
Use Scenario: Shields analog front-end inputs of pressure, temperature, or position sensors in factory automation systems exposed to relay coil flyback. IC Role / Device Role / Timing Role: Fast-response transient suppressor mounted directly at connector entry point before signal conditioning amplifier. Use Value: Clamps 1 kV EFT bursts within <1 ns, maintaining signal integrity and avoiding ADC saturation or offset drift in precision measurement circuits. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
Use Scenario: Protects PoE-powered equipment (e.g., IP cameras, access points) from induced surges on 48 V DC input lines due to nearby lightning or switching noise. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side DC bus, coordinated with upstream MOV and filter inductors. Use Value: Withstands repeated 3000 W pulses without degradation, ensuring multi-year field reliability in outdoor telecom enclosures. |
Use Scenario: Guards isolated gate driver ICs (e.g., Si823x, UCC53xx) against Miller-induced voltage spikes during IGBT/MOSFET switching in HVAC inverters. IC Role / Device Role / Timing Role: Localized TVS across gate-to-source terminals to limit dv/dt-induced false turn-on and gate oxide overstress. Use Value: 32.4 V clamping voltage aligns with typical 25 V gate oxide rating, providing margin below destructive threshold while minimizing capacitance impact. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Lower PPPM (400 W), same DO-214AC (SMA) package; VWM = 20 V, VC = 32.4 V at 12.3 A. | Not suitable for automotive load-dump duty cycles; limited to consumer-grade or low-energy signal-line protection. | Select when cost sensitivity outweighs surge robustness and board space allows larger footprint than SMC. |
| SMCJ20A | Same DO-214AB (SMC) package and 3000 W rating, but VWM = 20 V, VC = 32.4 V at 92.6 A - identical clamping performance. | Also AEC-Q101 qualified; differs only in marking code and minor process revision (HM3 vs. HM3_X). | Direct functional alternative with identical electrical and mechanical specs - verify packaging suffix compatibility with assembly line feeders. |
Compared with SMAJ20A and SMCJ20A, the 3KASMC20HE3/57T offers identical clamping and surge capability to SMCJ20A but with enhanced high-temperature stability (185 °C TJ max), while outperforming SMAJ20A by >7× peak power handling - making it optimal for mission-critical automotive and industrial deployments.
Availability
3KASMC20HE3/57T is available at Aetrix Electronics and suitable for automotive ECU power management, industrial sensor interface hardening, and telecom DC input protection requiring stable component supply across extended product lifecycles.
Supply support for 3KASMC20HE3/57T 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The 3KASMC20HE3/57T belongs to Vishay's PAR® TVS family, engineered specifically for high-temperature-stable transient suppression in automotive under-hood and industrial control environments where AEC-Q101 compliance and 185 °C operation are mandatory.
FAQ
What is the clamping voltage of the 3KASMC20HE3/57T under full-rated surge current?
The 3KASMC20HE3/57T exhibits a maximum clamping voltage (VC) of 32.4 V when subjected to its peak pulse current (IPPM) of 92.6 A using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures predictable overvoltage limiting for downstream 24 V system components. The 3KASMC20HE3/57T maintains this clamping performance across its full operating temperature range.
Is the 3KASMC20HE3/57T qualified for automotive applications?
Yes, the 3KASMC20HE3/57T is AEC-Q101 qualified and rated for TJ up to 185 °C, making it suitable for under-hood automotive applications including engine control units, body electronics, and ADAS sensor modules. It meets MSL Level 1 and uses matte tin-plated leads compliant with J-STD-002 - all confirmed in Vishay document 89962. The 3KASMC20HE3/57T is explicitly listed in the AEC-Q101 qualified base P/NHM3 family.
What package type does the 3KASMC20HE3/57T use, and what are its key mechanical features?
The 3KASMC20HE3/57T uses the DO-214AB (SMC) surface-mount package, with dimensions of 6.22 mm × 5.59 mm × 2.90 mm (L × W × H). It features a UL 94 V-0 compliant molding compound, cathode identification via color band, and matte tin-plated leads qualified per J-STD-002 and JESD 22-B102. The 3KASMC20HE3/57T also passes JESD 201 Class 2 whisker testing.
How does the 3KASMC20HE3/57T compare to standard SMAJ-series TVS diodes in surge capability?
The 3KASMC20HE3/57T delivers 3000 W peak pulse power (10/1000 μs), exceeding the 400 W rating of SMAJ20A by more than 7×. While both share 20 V VWM and similar VC, the 3KASMC20HE3/57T supports 92.6 A IPPM versus 12.3 A for SMAJ20A - enabling robust protection against automotive load-dump and industrial inductive switching events that SMAJ devices cannot sustain. The 3KASMC20HE3/57T is not a drop-in replacement due to different package size and thermal mass.
What is the maximum junction temperature rating for the 3KASMC20HE3/57T, and why does it matter?
The 3KASMC20HE3/57T is rated for a maximum junction temperature (TJ max.) of 185 °C - significantly higher than standard TVS diodes rated at 150 °C or 175 °C. This enables reliable operation in high-ambient environments such as automotive engine compartments or industrial motor drives without thermal derating. The 3KASMC20HE3/57T sustains full 3000 W surge capability up to TJ = 125 °C, verified per Vishay's derating curve in document 89962.
3KASMC20HE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 83.8A
- 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 (SMCJ)
3KASMC20HE3/57T FAQ
1.How can I place an order for 3KASMC20HE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC20HE3/57T 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 3KASMC20HE3/57T reliable?
The price and inventory of 3KASMC20HE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC20HE3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC20HE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC20HE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC20HE3/57T?
3KASMC20HE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC20HE3/57T 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 3KASMC20HE3/57T?
For technical support, including 3KASMC20HE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC20HE3/57T requirements.
6.How does Aetrix verify that 3KASMC20HE3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC20HE3/57T 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 3KASMC20HE3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC20HE3/57T?
All 3KASMC20HE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC20HE3/57T, 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 3KASMC20HE3/57T part is unused and in its original packaging.
Return procedure for 3KASMC20HE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC20HE3/57T Tags
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