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Vishay General Semiconductor - Diodes Division 3KASMC18AHM3_B/I
- Part No.:
- 3KASMC18AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC18AHM3_B/I.pdf
- Description:
- TVS DIODE 18VWM 29.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,086
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Product details
Overview
3KASMC18AHM3_B/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor in SMC (DO-214AB) package, rated for 18 V stand-off voltage (VWM), 20.0–22.1 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), 29.2 V clamping voltage at 103 A IPPM, and 185 °C maximum junction temperature - deployed for automotive sensor line protection against inductive switching transients.
For engineers reviewing the 3KASMC18AHM3_B/I datasheet, 3KASMC18AHM3_B/I pinout, 3KASMC18AHM3_B/I application, or 3KASMC18AHM3_B/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance, MSL Level 1 rating, and thermal resistance of 18.3 °C/W (junction-to-leads).
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to achieve stable clamping under high-temperature operation up to TJ = 185 °C and low incremental surge resistance. Its 10/1000 μs waveform response delivers 3000 W peak pulse power with 29.2 V clamping at 103 A, enabling robust protection of sensitive ICs and MOSFETs.
The device features a fixed unidirectional polarity with cathode band marking, meets JESD201 Class 2 whisker resistance, and is qualified per AEC-Q101 - confirming suitability for automotive-grade electronics where reliability under thermal stress and surge immunity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 18 V - maximum reverse stand-off voltage before conduction; defines safe operating margin for 12 V automotive systems. |
| VBR (min/typ/max) | 20.0 / 21.1 / 22.1 V at 1.0 mA - precise breakdown threshold ensures predictable turn-on during transients. |
| VC @ IPPM | 29.2 V at 103 A - clamping voltage limits downstream voltage stress during 3000 W surge events. |
| PPPM | 3000 W (10/1000 μs) - enables suppression of high-energy transients from inductive loads like solenoids or motors. |
| TJ max. | +185 °C - supports under-hood automotive applications without derating in high ambient environments. |
| RθJL | 18.3 °C/W - low junction-to-lead thermal resistance improves power handling during repetitive surges. |
| Polarity | Unidirectional - protects against positive-going transients only; requires correct orientation in circuit. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, UL 94 V-0 molding compound, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected line's low-side reference; forms clamping path to ground when transient exceeds VBR. |
| Cathode | Current exit terminal during forward conduction | Marked with band; tied to system ground or common return to complete transient current path. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR over lifetime and temperature cycling. |
| AEC-Q101 qualification | Validated for automotive use including temperature cycling, humidity bias, and mechanical shock testing. |
| Halogen-free & RoHS | HM3 suffix confirms compliance with environmental regulations and end-of-life material restrictions. |
| MSL Level 1 | Rated for reflow up to 260 °C peak, eliminating moisture sensitivity concerns in standard SMT assembly. |
| Low RθJL | 18.3 °C/W enables higher sustained surge capability without external heatsinking in compact layouts. |
Applications
| Automotive Sensor Protection | Industrial Motor Drive I/O |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive kickback in engine control units. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between signal line and chassis ground to shunt transient energy before it reaches IC input pins. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V interface ICs while maintaining signal integrity under 185 °C under-hood conditions. |
Use Scenario: Safeguarding PLC digital input modules connected to 24 V DC solenoid valves and relay coils subject to repeated switching surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on each input channel absorbs 3000 W pulses without degradation across >10⁵ cycles. Use Value: Eliminates need for external RC snubbers and extends field-replaceable module lifetime in factory automation environments. |
| Automotive Lighting Control | Telecom Power Supply Input |
Use Scenario: Clamping transients on LED driver enable lines and PWM inputs in adaptive front-lighting systems (AFS) exposed to battery voltage fluctuations. IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to gate drivers to suppress sub-100 ns spikes induced by high-di/dt switching. Use Value: Maintains functional safety compliance (ISO 26262 ASIL-B) by preventing false triggering or shutdown of lighting controllers. |
Use Scenario: Input-stage transient suppression on 48 V telecom power supplies subjected to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail upstream of DC/DC converters to limit voltage overshoot during surge events. Use Value: Enables single-stage protection architecture with 29.2 V clamping, reducing BOM count versus multi-stage TVS+MOV solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ18AHE3_A/H | Same SMC package, 18 V VWM, but lower PPPM (400 W) and higher VC (32.4 V at 12.3 A); not AEC-Q101 qualified. | Limited to consumer/industrial use; insufficient for automotive surge immunity requirements. | Select only for cost-sensitive non-automotive designs where 3000 W capability is unnecessary. |
| SMCJ18AHM3_A/H | Same AEC-Q101, halogen-free, and SMC package; identical VWM/VBR/VC specs but rated for 1500 W (10/1000 μs), not 3000 W. | Lower peak power rating restricts use to moderate-energy transients; unsuitable for high-inductance load switching. | Choose when thermal budget or board space constraints preclude 3KASMC18AHM3_B/I's full 3000 W capability. |
Compared with SMAJ18AHE3_A/H and SMCJ18AHM3_A/H, the 3KASMC18AHM3_B/I uniquely combines 3000 W peak power, AEC-Q101 qualification, and 185 °C operation - making it the only option among the three validated for high-reliability automotive powertrain and ADAS subsystems.
Availability
3KASMC18AHM3_B/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial motor drive I/O, and telecom power supply input applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 3KASMC18AHM3_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 was engineered specifically for high-temperature, high-surge automotive and industrial environments - delivering PAR® technology's precision clamping and long-life stability in SMC packaging.
FAQ
What is the clamping voltage of the 3KASMC18AHM3_B/I at its rated peak pulse current?
The 3KASMC18AHM3_B/I has a maximum clamping voltage (VC) of 29.2 V at 103 A peak pulse current (IPPM), measured under the standard 10/1000 μs waveform. This value ensures downstream components see limited overvoltage during high-energy transients. The 3KASMC18AHM3_B/I maintains this clamping performance across its full operating temperature range up to +185 °C.
Is the 3KASMC18AHM3_B/I qualified for automotive applications?
Yes, the 3KASMC18AHM3_B/I is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix HM3. It meets rigorous automotive reliability tests including temperature cycling, humidity bias, and mechanical shock. The 3KASMC18AHM3_B/I is explicitly intended for under-hood and ADAS applications where junction temperatures reach +185 °C.
What does the "HM3" suffix indicate in 3KASMC18AHM3_B/I?
The "HM3" suffix in 3KASMC18AHM3_B/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from HE3 (RoHS-compliant but not halogen-free) and confirms compliance with JESD201 Class 2 whisker resistance and MSL Level 1 reflow capability. The 3KASMC18AHM3_B/I is supplied in 13" tape-and-reel (3500 pcs).
How does the thermal resistance of the 3KASMC18AHM3_B/I affect its surge handling capability?
The 3KASMC18AHM3_B/I has a typical junction-to-lead thermal resistance (RθJL) of 18.3 °C/W, significantly lower than industry-standard SMC TVS devices. This allows more efficient heat transfer from the junction during repetitive surge events, supporting higher duty-cycle operation without thermal runaway. The 3KASMC18AHM3_B/I leverages this to sustain 3000 W pulses even in compact PCB layouts with minimal copper area.
Can the 3KASMC18AHM3_B/I be used in bidirectional protection circuits?
No, the 3KASMC18AHM3_B/I is unidirectional only, as stated in Vishay's datasheet. It conducts only when the cathode is positive relative to the anode and cannot suppress negative-going transients. For bidirectional protection, a separate device such as the 3KASMC18AHE3_B/I (not offered in HM3) or a dedicated bidirectional TVS must be selected. The 3KASMC18AHM3_B/I must be oriented correctly in-circuit with the cathode band toward the protected line's reference potential.
3KASMC18AHM3_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):
- 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 (SMC)
3KASMC18AHM3_B/I FAQ
1.How can I place an order for 3KASMC18AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC18AHM3_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 3KASMC18AHM3_B/I reliable?
The price and inventory of 3KASMC18AHM3_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 3KASMC18AHM3_B/I is usually 5 days.
3.What payment methods are accepted for 3KASMC18AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC18AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC18AHM3_B/I?
3KASMC18AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC18AHM3_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 3KASMC18AHM3_B/I?
For technical support, including 3KASMC18AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC18AHM3_B/I requirements.
6.How does Aetrix verify that 3KASMC18AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC18AHM3_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 3KASMC18AHM3_B/I meets industry standards.
7.What is the process for return or replacement of 3KASMC18AHM3_B/I?
All 3KASMC18AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC18AHM3_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 3KASMC18AHM3_B/I part is unused and in its original packaging.
Return procedure for 3KASMC18AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC18AHM3_B/I Tags
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