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Vishay General Semiconductor - Diodes Division 3KASMC18AHM3/57T
- Part No.:
- 3KASMC18AHM3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHM3/57T.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,011
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Product details
Overview
3KASMC18AHM3/57T from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown voltage (VBR), 3000 W peak pulse power (10/1000 μs), 103 A peak pulse current (IPPM), and 185 °C maximum junction temperature - deployed for automotive power line and sensor signal line surge protection.
For engineers reviewing the 3KASMC18AHM3/57T datasheet, 3KASMC18AHM3/57T pinout, 3KASMC18AHM3/57T application, or 3KASMC18AHM3/57T equivalent, key selection criteria include clamping voltage (29.2 V at IPPM), unidirectional polarity, AEC-Q101 qualification, MSL Level 1 rating, and thermal resistance (RθJA = 77.5 °C/W) under PCB-mounted conditions.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping performance across -65 °C to +185 °C operating range, with low incremental surge resistance and sub-nanosecond response time to transient overvoltage events. It is optimized for high-reliability automotive applications where thermal stability and repeatable surge immunity are critical.
The device operates exclusively in unidirectional mode, with cathode denoted by color band, and meets JESD201 Class 2 whisker resistance and UL 94 V-0 flammability requirements. Its 3000 W peak pulse power rating is specified per ANSI/IEEE C62.35 using 10/1000 μs waveform, and derates linearly above 25 °C ambient per published curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 12 V automotive systems. |
| VBR (min/max) | 20.0 V / 22.1 V at 1.0 mA - Confirmed breakdown threshold ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 29.2 V at 103 A - Clamping voltage limits downstream IC stress during 3000 W surge; critical for protecting 24 V-rated receivers. |
| PPPM | 3000 W (10/1000 μs) - Sustains high-energy transients such as ISO 7637-2 Pulse 5a without degradation. |
| TJ max | +185 °C - Enables placement near hot engine-control units or power converters without thermal derating penalties. |
| IR @ VWM | 1.0 μA - Ultra-low leakage preserves battery life in always-on automotive modules. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including HTOL, temperature cycling, and ESD robustness. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by color band. Complies with J-STD-002 and JESD22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance reference plane; carries full surge current during clamping. |
| Cathode | Protected line connection / Clamping node | Connected to line being protected (e.g., CAN_H, LIN, or 12 V rail); voltage clamped to ≤29.2 V during surge. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR and low leakage over lifetime and temperature. |
| High-temperature operation | Rated to TJ = +185 °C - supports under-hood placement without external heatsinking or derating. |
| Surge robustness | Withstands 200 A non-repetitive forward surge (8.3 ms half-sine) - protects against load dump and inductive kickback. |
| Automotive qualification | AEC-Q101 qualified and MSL Level 1 - suitable for reflow assembly and long-term field deployment in vehicles. |
| Low clamping ratio | VC/VBR ≈ 1.32 - tight clamping margin minimizes overvoltage exposure to downstream logic and analog circuitry. |
Applications
| Automotive Power Line Protection | Automotive Sensor Signal Lines |
|---|---|
|
Use Scenario: Protecting 12 V supply rails in engine control units (ECUs) and body control modules (BCMs) from ISO 7637-2 Pulse 5a (load dump) and Pulse 1/2b (inductive switching). IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between power rail and chassis ground to clamp surges within safe voltage limits. Use Value: Limits peak voltage to ≤29.2 V during 3000 W transients, preventing damage to 36 V-rated DC-DC controllers and microcontrollers. |
Use Scenario: Shielding LIN bus, analog sensor outputs (e.g., pressure, temperature), and digital I/O lines in ADAS cameras and radar modules. IC Role / Device Role / Timing Role: Standoff protection element on signal traces, absorbing ESD and fast transients while maintaining signal integrity. Use Value: Sub-nanosecond response and 1.0 μA leakage preserve low-noise analog performance and battery drain in always-on sensors. |
| Industrial Motor Drive Control | Telecom Power Interface |
|
Use Scenario: Safeguarding gate drivers and feedback circuits in BLDC motor inverters exposed to commutation spikes and back-EMF. IC Role / Device Role / Timing Role: Transient suppressor across DC bus or isolated signal paths to prevent latch-up and false triggering. Use Value: 185 °C junction rating allows mounting directly on motor driver PCBs near heat-generating MOSFETs without thermal compromise. |
Use Scenario: Front-end protection of 48 V PoE-powered equipment (e.g., IP cameras, wireless access points) against lightning-induced surges on Ethernet pairs. IC Role / Device Role / Timing Role: Primary clamping device on secondary-side DC input, coordinated with upstream GDT or MOV. Use Value: 3000 W peak power and 77.5 °C/W RθJA enable compact layout without forced-air cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18A | Same DO-214AC (SMA) package; lower PPPM (400 W); VBR 20.0–22.2 V; RθJA ≈ 110 °C/W | Limited to low-energy transients (e.g., ESD, contact discharge); unsuitable for load dump or ISO 7637-2 Pulse 5a | Select when cost sensitivity outweighs surge energy requirement and board space permits larger thermal pad area. |
| 1.5KE18A | Through-hole DO-201AE package; same 3000 W rating; VBR 20.0–22.2 V; higher VF (3.5 V), no AEC-Q101 qualification | Requires wave soldering; not validated for automotive vibration or thermal cycling; higher mounting height | Choose only for legacy through-hole designs or non-automotive industrial use where reflow compatibility is not required. |
Compared with SMAJ18A and 1.5KE18A, the 3KASMC18AHM3/57T uniquely combines AEC-Q101 qualification, DO-214AB surface-mount form factor, 185 °C operation, and 3000 W capability - enabling single-device compliance with stringent automotive surge standards without layout or qualification trade-offs.
Availability
3KASMC18AHM3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial motor drives, telecom power interfaces, and sensor signal conditioning requiring stable component supply and long-term lifecycle assurance.
Supply support for 3KASMC18AHM3/57T 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, rectifiers, and protection devices for automotive, industrial, and computing markets.
The 3KASMC series is part of Vishay's PAR® TVS platform, engineered specifically for high-temperature, high-surge automotive environments - delivering consistent clamping performance under extended thermal and electrical stress.
FAQ
What is the clamping voltage of the 3KASMC18AHM3/57T at its rated peak pulse current?
The 3KASMC18AHM3/57T has a maximum clamping voltage (VC) of 29.2 V when subjected to its rated peak pulse current (IPPM) of 103 A using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components remain within safe voltage limits during standardized surge events such as ISO 7637-2 Pulse 5a.
Is the 3KASMC18AHM3/57T qualified for automotive applications?
Yes, the 3KASMC18AHM3/57T is AEC-Q101 qualified and rated for operation up to +185 °C junction temperature. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing - confirming suitability for under-hood automotive electronics including engine control, ADAS, and body modules.
What package type does the 3KASMC18AHM3/57T use, and what are its key mechanical features?
The 3KASMC18AHM3/57T uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads. Key mechanical features include UL 94 V-0 compliant molding compound, cathode identification via color band, and compliance with J-STD-002 and JESD22-B102 solderability standards - enabling reliable reflow assembly in high-volume automotive manufacturing.
How does the 3KASMC18AHM3/57T compare to standard SMAJ-series TVS diodes in surge handling capability?
The 3KASMC18AHM3/57T delivers 3000 W peak pulse power (10/1000 μs), whereas SMAJ18A is rated for only 400 W. This 7.5× higher energy handling enables the 3KASMC18AHM3/57T to survive automotive load dump events that would destroy SMAJ-class devices - making it appropriate for primary front-end protection in demanding applications.
What is the maximum reverse leakage current of the 3KASMC18AHM3/57T at its stand-off voltage?
The 3KASMC18AHM3/57T exhibits a maximum reverse leakage current (IR) of 1.0 μA at its 18 V stand-off voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage helps minimize standby power loss in battery-powered automotive modules and ensures long-term reliability in always-on sensor nodes.
3KASMC18AHM3/57T 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:
- 29.2V
- Current - Peak Pulse (10/1000µs):
- 103A
- 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)
3KASMC18AHM3/57T FAQ
1.How can I place an order for 3KASMC18AHM3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHM3/57T 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 3KASMC18AHM3/57T reliable?
The price and inventory of 3KASMC18AHM3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC18AHM3/57T is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHM3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHM3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHM3/57T?
3KASMC18AHM3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHM3/57T 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 3KASMC18AHM3/57T?
For technical support, including 3KASMC18AHM3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHM3/57T requirements.
6.How does Aetrix verify that 3KASMC18AHM3/57T is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHM3/57T 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 3KASMC18AHM3/57T meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHM3/57T?
All 3KASMC18AHM3/57T units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHM3/57T, 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 3KASMC18AHM3/57T part is unused and in its original packaging.
Return procedure for 3KASMC18AHM3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC18AHM3/57T Tags
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