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Vishay General Semiconductor - Diodes Division SMCJ12AHM3/H
- Part No.:
- SMCJ12AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12AHM3/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,036
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Product details
Overview
SMCJ12AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), and clamps transients to ≤19.9 V at 75.4 A IPPM. It is halogen-free, RoHS-compliant, and qualified to AEC-Q101 for automotive use.
For engineers reviewing the SMCJ12AHM3/H datasheet, SMCJ12AHM3/H pinout, SMCJ12AHM3/H application, or SMCJ12AHM3/H equivalent, key selection criteria include its 1500 W surge rating, low clamping ratio (VC/VBR ≈ 1.45), -55 °C to +150 °C operating junction temperature range, and compatibility with automated SMT placement on standard PCB copper pads (8.0 mm × 8.0 mm).
Technical Context
The SMCJ12AHM3/H operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling fast response (<1 ns) to ESD and lightning-induced transients.
It is rated for non-repetitive 10/1000 µs surge pulses up to 1500 W, with thermal resistance RθJA = 75 °C/W and RθJL = 15 °C/W. The cathode band marking identifies polarity, and it meets JESD201 Class 2 whisker resistance and MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - Tight breakdown window ensures predictable turn-on behavior |
| VC @ IPPM | 19.9 V at 75.4 A - Clamping voltage defines maximum stress imposed on protected circuitry |
| PPPM | 1500 W (10/1000 µs) - Peak surge energy handling capacity under standardized waveform |
| ID @ VWM | 5.0 µA - Low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial environments |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint |
Pinout & Package
Package: SMC (DO-214AB), molded plastic case with matte tin-plated leads; polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional conduction path) | Connected to ground or lower-potential rail during clamping; must be routed with low-inductance trace |
| Cathode | Reverse-biased terminal (marked with band) | Connected to protected line; avalanche conduction occurs when voltage at this pin exceeds VBR relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Halogen-free & RoHS-compliant | Meets global environmental compliance requirements without compromising surge performance or thermal stability |
| Low clamping ratio (VC/VBR) | ~1.45 - Minimizes overvoltage overshoot during transient events, reducing risk to downstream ICs |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C peak without popcorn cracking or delamination |
| Glass-passivated junction | Ensures long-term parameter stability and immunity to moisture-induced degradation in harsh environments |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs, lighting modules, and body control units from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping device placed at board-level input filter stage to shunt surge energy before reaching DC-DC converters and microcontrollers. Use Value: Withstands 1500 W surges and operates up to +150 °C, meeting AEC-Q101 requirements for under-hood deployment. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules exposed to field wiring transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between sensor signal line and ground to clamp negative-going spikes while preserving DC bias integrity. Use Value: 5.0 µA leakage at 12 V VWM avoids loading high-impedance sensor outputs; 19.9 V VC limits stress on 24 V-tolerant op-amps. |
| Telecom Power Supply Input | Consumer USB Port ESD Protection |
Use Scenario: Secondary overvoltage protection on AC/DC adapter outputs feeding telecom base station subsystems. IC Role / Device Role / Timing Role: Standoff-rated TVS deployed after primary MOV filtering to handle residual fast-rising transients not absorbed upstream. Use Value: 13.3–14.7 V VBR aligns with 12 V nominal rails; 75.4 A IPPM handles repetitive surges per ITU-T K.20/21 standards. | Use Scenario: Board-level protection for USB 2.0 VBUS lines against human-body-model (HBM) ESD and cable discharge events. IC Role / Device Role / Timing Role: Unidirectional suppressor connected between VBUS and ground, leveraging fast <1 ns response to divert 8 kV contact ESD. Use Value: 1500 W PPPM exceeds IEC 61000-4-2 Level 4 requirement (30 A 8/20 µs); halogen-free construction supports consumer product compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12AHE3/A | Lower PPPM (400 W), same VWM (12 V), SMA package (smaller footprint, higher RθJA) | Not suitable for 1500 W surge events; limited to low-energy ESD or secondary protection | Select only if space-constrained and surge threat level is ≤400 W |
| SMCJ12A-M3/57T | Same electrical specs and SMC package, but commercial-grade (non-AEC-Q101), halogen-free, tape-and-reel delivery | Lacks automotive qualification; acceptable for industrial/commercial designs where AEC-Q101 is not mandated | Choose when cost sensitivity outweighs automotive qualification requirement |
Compared with SMCJ12A-M3/57T and SMAJ12AHE3/A, the SMCJ12AHM3/H uniquely combines AEC-Q101 qualification, 1500 W surge capability, and halogen-free compliance-making it the only option among the three validated for high-reliability automotive power-line protection.
Availability
SMCJ12AHM3/H is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and telecom power supply inputs requiring stable component supply, full traceability, and lifecycle continuity.
Supply support for SMCJ12AHM3/H 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and communications infrastructure where robustness and repeatable clamping behavior are critical.
FAQ
What is the clamping voltage of the SMCJ12AHM3/H under maximum surge conditions?
The SMCJ12AHM3/H clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 75.4 A (10/1000 µs waveform). This value is measured at the device terminals under standardized test conditions and defines the upper voltage limit imposed on protected circuits during surge events. The SMCJ12AHM3/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), ensuring consistent protection in demanding environments.
Is the SMCJ12AHM3/H suitable for automotive applications?
Yes, the SMCJ12AHM3/H is AEC-Q101 qualified and explicitly designated for automotive use, as confirmed by its HM3 suffix and documentation in Vishay's SMCJ5.0A–SMCJ188CA datasheet. It undergoes rigorous stress testing-including temperature cycling, high-temperature reverse bias, and ESD-to meet automotive reliability requirements. The SMCJ12AHM3/H is commonly deployed in engine control units, body electronics, and ADAS power domains where sustained operation at +150 °C and immunity to load-dump transients are mandatory.
How does the SMCJ12AHM3/H differ from the standard SMCJ12A-M3/57T?
The SMCJ12AHM3/H shares identical electrical specifications and SMC (DO-214AB) package with SMCJ12A-M3/57T but adds AEC-Q101 qualification and uses a different packaging code (H vs. 57T). The "H" denotes 7-inch tape-and-reel delivery with AEC-Q101 screening, whereas "57T" indicates commercial-grade parts in the same reel format. Both are halogen-free and RoHS-compliant, but only the SMCJ12AHM3/H carries automotive qualification-making it the required choice for safety-critical vehicle systems.
What is the thermal resistance of the SMCJ12AHM3/H, and how does it affect PCB layout?
The SMCJ12AHM3/H has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead resistance (RθJL) of 15 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe junction temperatures during repeated surge events, PCB layout must provide adequate copper area and minimize trace inductance. Reducing RθJA through enhanced copper pour or thermal vias directly improves surge endurance and long-term reliability of the SMCJ12AHM3/H in high-power transient scenarios.
Does the SMCJ12AHM3/H have polarity marking, and how is it identified?
Yes, the SMCJ12AHM3/H is unidirectional and features a visible cathode band on the package body-consistent with DO-214AB standard marking. The banded end corresponds to the cathode terminal, which connects to the protected line (e.g., 12 V rail), while the unbanded end is the anode, tied to ground. Correct orientation is essential: reverse installation prevents clamping action and may cause catastrophic failure during overvoltage events. The SMCJ12AHM3/H datasheet confirms this polarity convention in both mechanical drawings and electrical test setup diagrams.
SMCJ12AHM3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 75.4A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ12AHM3/H FAQ
1.How can I place an order for SMCJ12AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12AHM3/H 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 SMCJ12AHM3/H reliable?
The price and inventory of SMCJ12AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12AHM3/H is usually 5 days.
3.What payment methods are accepted for SMCJ12AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12AHM3/H?
SMCJ12AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12AHM3/H 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 SMCJ12AHM3/H?
For technical support, including SMCJ12AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12AHM3/H requirements.
6.How does Aetrix verify that SMCJ12AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMCJ12AHM3/H 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 SMCJ12AHM3/H meets industry standards.
7.What is the process for return or replacement of SMCJ12AHM3/H?
All SMCJ12AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12AHM3/H, 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 SMCJ12AHM3/H part is unused and in its original packaging.
Return procedure for SMCJ12AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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