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Vishay General Semiconductor - Diodes Division 3KASMC18HE3/57T
- Part No.:
- 3KASMC18HE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18HE3/57T.pdf
- Description:
- TVS DIODE 18VWM 32.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,718
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Product details
Overview
3KASMC18HE3/57T from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 29.2 V under 103 A surge current, and operates up to 185 °C junction temperature - enabling robust protection of MOSFETs and ICs against inductive switching transients in engine control units and motor drives.
For engineers reviewing the 3KASMC18HE3/57T datasheet, 3KASMC18HE3/57T pinout, 3KASMC18HE3/57T application, or 3KASMC18HE3/57T equivalent, this page provides verified electrical specs, DO-214AB package details, AEC-Q101 qualification status, thermal resistance data, and real-world design guidance for transient suppression in high-reliability 12 V and 24 V systems.
Technical Context
The 3KASMC18HE3/57T uses passivated anisotropic rectifier technology optimized for stable clamping performance across -65 °C to +185 °C. Its unidirectional architecture supports DC-biased lines where reverse conduction must be blocked until breakdown occurs at 20.0–22.1 V.
It meets J-STD-020 MSL Level 1 (260 °C peak reflow), features matte tin-plated leads compliant with JESD 22-B102, and is qualified to AEC-Q101 for automotive under-hood applications. The device exhibits low incremental surge resistance and fast response time - critical for protecting sensitive gate drivers during load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 20.0 V / 22.1 V at 1.0 mA - defines precise breakdown threshold for reliable triggering before downstream component damage |
| VWM | 18 V - maximum continuous reverse operating voltage; ensures no leakage-induced power loss in 12 V nominal systems |
| VC @ IPPM | 29.2 V at 103 A - clamping voltage under full 3000 W surge; limits stress on protected 30 V-rated MOSFETs |
| PPPM | 3000 W (10/1000 μs) - sustains high-energy transients like ISO 7637-2 Pulse 5a without degradation |
| TJ max. | +185 °C - enables placement near heat sources (e.g., power inductors, inverters) without derating |
| RθJA | 77.5 °C/W - thermal resistance from junction to ambient; informs PCB pad layout and heatsinking requirements |
| AEC-Q101 | Qualified - validated for automotive use including temperature cycling, humidity bias, and mechanical shock |
Pinout & Package
Package: DO-214AB (SMC) - surface-mount plastic case with cathode band marking; dimensions 7.11 mm × 6.22 mm × 2.90 mm; UL 94 V-0 rated molding compound; RoHS-compliant and halogen-free per JEDEC JS709A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; carries surge current during clamping |
| Cathode | Reverse-biased terminal | Connected to protected line (e.g., battery rail); color band identifies polarity for correct PCB orientation |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR over lifetime and temperature |
| High-temperature operation | Rated for continuous operation up to +185 °C junction - eliminates need for thermal derating in under-hood environments |
| Peak pulse power | 3000 W capability with 10/1000 μs waveform - exceeds ISO 7637-2 Pulse 5a requirements for 24 V commercial vehicles |
| Clamping performance | 29.2 V clamping at 103 A - maintains safe margin below 30 V logic and power device ratings |
| Manufacturing compliance | MSL Level 1 (260 °C peak), JESD 201 Class 2 whisker resistance, and matte tin plating for reliable solder joints |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Supply |
|---|---|
Use Scenario: Protection of microcontroller power inputs and CAN transceiver VCC rails against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and LDO input to clamp transients before regulation. Use Value: Withstands 3000 W surges while maintaining 29.2 V clamping - prevents brownout resets and latch-up in 5 V/3.3 V domains. |
Use Scenario: Safeguarding gate driver ICs and bootstrap FETs in three-phase inverter stages exposed to inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected TVS on high-side gate supply rail to absorb energy from parasitic inductance during switching transitions. Use Value: 185 °C rating allows mounting directly on power board near IGBT modules without thermal isolation. |
| Telecom Base Station DC Feeds | Consumer Appliance Main Board |
Use Scenario: Surge protection on -48 V telecom power distribution boards subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional protection not required; unidirectional 3KASMC18HE3/57T used on negative rail with proper grounding topology. Use Value: Low leakage (<1 μA at 18 V) minimizes standby power loss across thousands of deployed units. |
Use Scenario: Input protection for smart home hub power management ICs handling USB-C PD and legacy AC adapters. IC Role / Device Role / Timing Role: First-line defense on 12 V input stage before buck converter, absorbing ESD and plug-in surges. Use Value: DO-214AB footprint enables high-density layout; AEC-Q101 qualification adds reliability margin beyond consumer-grade requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Lower PPPM (400 W), smaller SMA package, VC = 29.2 V at 13.6 A - insufficient for ISO 7637-2 Pulse 5a | Targeted at consumer electronics with lower surge severity; lacks AEC-Q101 qualification | Select only for cost-sensitive non-automotive designs where 3000 W surge immunity is not required |
| SMCJ18A | Same DO-214AB package, identical VBR/VC, but rated for 1500 W PPPM and TJ max = 150 °C | Valid for industrial controls but not qualified for automotive under-hood deployment per AEC-Q101 | Choose when thermal environment stays below 150 °C and 3000 W surge headroom is unnecessary |
Compared with SMAJ18A and SMCJ18A, the 3KASMC18HE3/57T uniquely combines 3000 W surge capacity, +185 °C operation, and AEC-Q101 qualification - making it the only option among the three suitable for automotive powertrain and ADAS subsystems requiring sustained high-temperature reliability.
Availability
3KASMC18HE3/57T is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom DC feeds, and consumer appliance main boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 3KASMC18HE3/57T 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, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMC18HE3/57T belongs to Vishay's PAR® TVS family - engineered specifically for high-temperature, high-surge environments such as automotive power distribution and industrial motor control, where traditional TVS devices fail prematurely.
FAQ
What is the breakdown voltage range of the 3KASMC18HE3/57T?
The 3KASMC18HE3/57T has a guaranteed breakdown voltage range of 20.0 V to 22.1 V at 1.0 mA test current, per Vishay Document Number 89962. This tight VBR window ensures consistent triggering behavior across production lots and temperature extremes, critical for predictable protection in safety-critical automotive circuits.
Is the 3KASMC18HE3/57T AEC-Q101 qualified?
Yes, the 3KASMC18HE3/57T is explicitly AEC-Q101 qualified, as confirmed in the "MECHANICAL DATA" section of Vishay's 89962 datasheet. This qualification covers stress tests including temperature cycling, high-temperature operating life, and mechanical shock - validating its suitability for automotive under-hood applications.
What package does the 3KASMC18HE3/57T use, and what are its key mechanical features?
The 3KASMC18HE3/57T uses the DO-214AB (SMC) surface-mount package: 7.11 mm × 6.22 mm × 2.90 mm body size, UL 94 V-0 flammability rating, matte tin-plated leads, and cathode band marking. Its MSL Level 1 rating permits standard 260 °C reflow profiles without preconditioning.
How does the 3KASMC18HE3/57T perform under high-temperature conditions?
The 3KASMC18HE3/57T is rated for continuous operation up to +185 °C junction temperature - exceeding standard automotive requirements. Its thermal resistance RθJA is 77.5 °C/W, and derating curves in Figure 2 of the datasheet confirm usable power dissipation even at 150 °C ambient, supporting placement near power components.
What is the clamping voltage of the 3KASMC18HE3/57T at its maximum surge current?
At its rated peak pulse current of 103 A (10/1000 μs waveform), the 3KASMC18HE3/57T clamps at 29.2 V - documented in the "ELECTRICAL CHARACTERISTICS" table of Vishay's 89962 datasheet. This value provides a safe margin below 30 V-rated power semiconductors and logic ICs in protected circuits.
3KASMC18HE3/57T 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):
- 18V
- Voltage - Breakdown (Min):
- 20V
- Voltage - Clamping (Max) @ Ipp:
- 32.2V
- Current - Peak Pulse (10/1000µs):
- 93.2A
- 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)
3KASMC18HE3/57T FAQ
1.How can I place an order for 3KASMC18HE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18HE3/57T 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 3KASMC18HE3/57T reliable?
The price and inventory of 3KASMC18HE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC18HE3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC18HE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18HE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18HE3/57T?
3KASMC18HE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18HE3/57T 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 3KASMC18HE3/57T?
For technical support, including 3KASMC18HE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18HE3/57T requirements.
6.How does Aetrix verify that 3KASMC18HE3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC18HE3/57T 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 3KASMC18HE3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC18HE3/57T?
All 3KASMC18HE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18HE3/57T, 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 3KASMC18HE3/57T part is unused and in its original packaging.
Return procedure for 3KASMC18HE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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