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Vishay General Semiconductor - Diodes Division 3KASMC12AHM3_A/I
- Part No.:
- 3KASMC12AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHM3_A/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,637
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Product details
Overview
3KASMC12AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor (TVS) designed for high-energy surge clamping in automotive and industrial power rails. It delivers 3000 W peak pulse power (10/1000 μs), clamps at 19.9 V under 151 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 3KASMC12AHM3_A/I datasheet, 3KASMC12AHM3_A/I pinout, 3KASMC12AHM3_A/I application, or 3KASMC12AHM3_A/I equivalent, key selection criteria include its DO-214AB (SMC) package, 12 V stand-off voltage, AEC-Q101 qualification, 177 A maximum peak pulse current, and 19.9 V clamping voltage at rated surge - all critical for automotive-grade ESD and load-dump protection design validation.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for high-temperature stability and low incremental surge resistance. Its unidirectional polarity and 13.3–14.7 V breakdown range (at 1 mA) ensure precise overvoltage triggering while maintaining tight tolerance across production lots.
The device meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports 200 A non-repetitive forward surge (8.3 ms half-sine), and exhibits 77.5 °C/W junction-to-ambient thermal resistance - confirming suitability for high-power-density PCB layouts with minimal heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 12 V - maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 12 V automotive systems. |
| Breakdown Voltage (VBR) | 13.3–14.7 V at 1 mA - guaranteed conduction onset range; ensures reliable turn-on before downstream component damage thresholds. |
| Clamping Voltage (VC) | 19.9 V at 151 A (10/1000 μs) - peak voltage seen by protected circuit during worst-case surge; enables safe operation of 20 V-rated MOSFETs. |
| Peak Pulse Power (PPPM) | 3000 W - energy-handling capacity for standardized 10/1000 μs transients; exceeds ISO 7637-2 Pulse 5a requirements. |
| Junction Temperature (TJ) | −65 to +185 °C - extended thermal range supports under-hood automotive placement without derating penalties. |
| AEC-Q101 Qualified | Yes - validated for automotive electronic modules per stress test requirements including HTGB, HTRB, and TCT. |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and matte tin-plated leads. |
Pinout & Package
DO-214AB (SMC) package: molded epoxy case with cathode band marking; terminals are matte tin-plated leads compliant with J-STD-002 solderability and JESD 22-B102 whisker testing (Class 2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to ground or low-side reference | Provides low-impedance path to shunt surge current away from protected IC/MOSFET when reverse voltage exceeds VWM. |
| Cathode | Current exit point in forward bias; marked by color band; connected to protected line | Defines polarity-sensitive connection - must be placed on the line requiring clamping (e.g., battery rail, motor driver output). |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation optimized design | Enables stable leakage performance (<2 μA at 12 V, 150 °C) and long-term reliability under thermal cycling. |
| TJ = 185 °C capability | Eliminates need for thermal derating in under-hood environments up to 150 °C ambient, simplifying thermal design. |
| 3000 W peak pulse power (10/1000 μs) | Handles severe load-dump events (e.g., ISO 7637-2 Pulse 5a) without degradation or failure. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients, improving protection margin for sensitive gate drivers. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial Motor Drive Power Stage |
|---|---|
Use Scenario: Protecting microcontroller I/O and power supply inputs from alternator load-dump spikes and relay coil flyback in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and local DC/DC input or MCU VDD pin. Use Value: Clamps 19.9 V at 151 A, staying below 20 V absolute maximum rating of automotive MCUs and ensuring AEC-Q100 compliance. |
Use Scenario: Safeguarding gate drivers and bootstrap circuits in 3-phase inverter stages from cross-conduction-induced shoot-through surges. IC Role / Device Role / Timing Role: Fast-response TVS mounted directly at half-bridge output node to limit dv/dt-induced voltage overshoot. Use Value: 10/1000 μs response and 3000 W rating absorb repetitive switching transients without parametric shift or thermal runaway. |
| Telecom Base Station Power Supply | Consumer Appliance Main Board |
Use Scenario: Suppressing lightning-induced surges on -48 V DC distribution lines feeding RF amplifier modules in outdoor base stations. IC Role / Device Role / Timing Role: Primary overvoltage protector on input bulk capacitor rail, upstream of DC/DC converters. Use Value: 185 °C TJ rating allows operation in sealed enclosures with limited airflow; RoHS-compliant HM3 suffix meets telecom environmental standards. |
Use Scenario: Shielding microcontroller reset lines and communication buses (e.g., I²C) from ESD and relay bounce in washing machine control boards. IC Role / Device Role / Timing Role: Low-capacitance TVS (typ. <100 pF at 0 V) placed adjacent to connector pins to minimize signal distortion. Use Value: 19.9 V clamping prevents latch-up in 3.3 V/5 V logic while maintaining sub-ns response time for human-body-model ESD events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/57T (Vishay) | Lower PPPM (400 W), smaller SMA package (DO-214AC), same 12 V VWM but higher VC (20.1 V at 21.5 A) | Targeted at lower-energy consumer electronics; insufficient for automotive load-dump compliance | Select 3KASMC12AHM3_A/I when 3000 W surge handling and AEC-Q101 qualification are mandatory. |
| 1.5KE12A (ON Semiconductor) | Through-hole DO-201 package, 1500 W PPPM, higher VF (3.5 V), no AEC-Q101 qualification | Legacy industrial designs with through-hole assembly; not suitable for automated SMT or automotive use | Choose 3KASMC12AHM3_A/I for surface-mount compatibility, higher power density, and automotive qualification. |
Compared with SMAJ12A-E3/57T and 1.5KE12A, the 3KASMC12AHM3_A/I provides triple the peak pulse power in a qualified SMT package, enabling single-device compliance with ISO 7637-2 Pulse 5a while eliminating through-hole assembly and reducing board space by >40%.
Availability
3KASMC12AHM3_A/I is available at Aetrix Electronics and suitable for automotive engine control units, industrial motor drives, telecom power supplies, and consumer appliance main boards requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for 3KASMC12AHM3_A/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 high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMC series belongs to Vishay's PAR® TVS platform, engineered specifically for high-temperature, high-energy transient suppression in automotive power electronics and harsh-environment industrial controls.
FAQ
What is the clamping voltage of the 3KASMC12AHM3_A/I under full-rated surge current?
The 3KASMC12AHM3_A/I clamps at 19.9 V when subjected to its maximum rated peak pulse current of 151 A using the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 05-Mar-13, ensuring predictable protection behavior for 20 V-tolerant components in the protected circuit.
Is the 3KASMC12AHM3_A/I qualified for automotive applications?
Yes, the 3KASMC12AHM3_A/I is AEC-Q101 qualified and explicitly listed as such in the Vishay documentation. It undergoes stress testing including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT) to meet automotive reliability requirements - making it suitable for use in engine control units, body control modules, and ADAS power supplies.
What does the "HM3_A/I" suffix indicate in 3KASMC12AHM3_A/I?
The "HM3" denotes the RoHS-compliant, AEC-Q101-qualified DO-214AB (SMC) package variant; "_A" indicates the revision code; and "/I" specifies the 13-inch tape-and-reel delivery format with 3500 units per reel. This ordering code ensures traceable, production-ready packaging aligned with Vishay's preferred logistics configuration.
Can the 3KASMC12AHM3_A/I replace older SMC-packaged TVS diodes like P6SMB12A?
The 3KASMC12AHM3_A/I offers superior performance versus P6SMB12A: 3000 W vs. 600 W peak pulse power, 185 °C vs. 150 °C max junction temperature, and AEC-Q101 qualification vs. commercial grade. While both use DO-214AB, direct replacement requires verification of layout thermal relief and surge current path - the 3KASMC12AHM3_A/I is not a drop-in substitute without system-level validation.
What is the maximum reverse leakage current of the 3KASMC12AHM3_A/I at 12 V and 150 °C?
Per the Vishay datasheet, the 3KASMC12AHM3_A/I exhibits a maximum reverse leakage current of 2.0 μA at VWM = 12 V and TJ = 150 °C. This low leakage ensures minimal standby power loss in always-on automotive modules and maintains signal integrity on high-impedance sensor lines.
3KASMC12AHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 151A
- 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)
3KASMC12AHM3_A/I FAQ
1.How can I place an order for 3KASMC12AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHM3_A/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 3KASMC12AHM3_A/I reliable?
The price and inventory of 3KASMC12AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC12AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHM3_A/I?
3KASMC12AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHM3_A/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 3KASMC12AHM3_A/I?
For technical support, including 3KASMC12AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHM3_A/I requirements.
6.How does Aetrix verify that 3KASMC12AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHM3_A/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 3KASMC12AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHM3_A/I?
All 3KASMC12AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHM3_A/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 3KASMC12AHM3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC12AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC12AHM3_A/I Tags
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