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Vishay General Semiconductor - Diodes Division SMCJ12AHM3/I
- Part No.:
- SMCJ12AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12AHM3/I.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,956
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Product details
Overview
SMCJ12AHM3/I from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V clamping voltage (VC) at 75.4 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 µs waveform.
For engineers reviewing the SMCJ12AHM3/I datasheet, SMCJ12AHM3/I pinout, SMCJ12AHM3/I application, or SMCJ12AHM3/I equivalent, key selection criteria include clamping performance under surge conditions, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ12AHM3/I employs a glass-passivated silicon junction optimized for fast response (<1 ps) to transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its unidirectional polarity-marked by a cathode band-enables integration into DC-biased circuits where reverse conduction must be blocked until clamping threshold is exceeded.
Rated for -55 °C to +150 °C operating junction temperature and meeting MSL Level 1 per J-STD-020 (260 °C peak reflow), it supports high-reliability automotive and industrial applications. The device delivers 6.5 W steady-state power dissipation at TA = 50 °C and exhibits a low incremental surge resistance that sustains clamping stability across repetitive transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse working voltage before clamping initiates; defines safe DC operating margin. |
| VBR min/max | 13.3 V / 14.7 V at IT = 1 mA - Confirmed breakdown range ensures predictable turn-on behavior under surge stress. |
| VC @ IPPM | 19.9 V at 75.4 A - Clamping voltage during 10/1000 µs transient; determines maximum voltage seen by protected IC/MOSFET. |
| PPPM | 1500 W - Peak pulse power handling capability; validates suitability for IEC 61000-4-5 Level 4 (4 kV) surge immunity designs. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance; informs PCB pad layout requirements (0.31" × 0.31" copper per terminal). |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002. Cathode indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to ground or low-impedance return in unidirectional configuration; carries full IPPM during clamping. |
| Cathode | Protected line connection / Clamping node | Connected to the line being protected (e.g., 12 V rail); conducts when reverse voltage exceeds VBR, shunting surge to Anode. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with automated pick-and-place systems (0.320" height max). |
| Glass-passivated junction | Ensures stable VBR over lifetime and improved moisture resistance versus epoxy-passivated alternatives. |
| 1500 W peak pulse rating | Supports protection against severe transients including ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems. |
| AEC-Q101 qualified (HM3 suffix) | Validates reliability for automotive powertrain, body control, and ADAS modules requiring zero-defect field performance. |
| Halogen-free & RoHS-compliant | Fulfills environmental compliance mandates for global OEMs and industrial equipment sold in EU, China, and Japan. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V supply lines in engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy to prevent MOSFET gate oxide failure and microcontroller brownout. Use Value: Clamps to ≤19.9 V at 75.4 A, maintaining downstream ICs within absolute maximum ratings during 120 V/50 ms load dump events. |
Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) in PLC I/O modules from EFT and surge coupling. IC Role / Device Role / Timing Role: Fast-response surge diverter placed at connector entry point to limit voltage excursion before signal conditioning circuitry. Use Value: Sub-1 ns response time and 19.9 V clamping ensure <100 ns overvoltage exposure to precision op-amps and ADC front-ends. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
|
Use Scenario: Safeguarding 12 V/24 V DC input stages of base station power supplies from induced lightning surges. IC Role / Device Role / Timing Role: Primary-level TVS on bulk input rail, coordinated with upstream MOVs and downstream polymer PTCs. Use Value: 1500 W PPPM rating allows coordination with 10 kA-class secondary protectors without thermal runaway or follow-on current issues. |
Use Scenario: Adding robustness to USB-C VBUS lines in portable monitors and docking stations exposed to hot-plug transients. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between connector and USB PD controller to absorb ±15 kV contact ESD per IEC 61000-4-2. Use Value: 12 V VWM provides sufficient margin above 5–20 V USB PD operating range while enabling low VC clamping during ESD events. |
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), SMA package (DO-214AC), same VWM/VBR/VC specs. | Not suitable for IEC 61000-4-5 Level 4; limited to lower-energy transients in space-constrained consumer designs. | Select when board area is critical and surge threat level is ≤1 kV; verify thermal derating for continuous operation. |
| SMCJ12AHE3/I | Same electrical specs and SMC package, but commercial-grade (E3 suffix) - not AEC-Q101 qualified or halogen-free. | Lacks automotive qualification and halogen-free compliance; restricted to non-automotive industrial or telecom use. | Choose for cost-sensitive non-automotive applications where AEC-Q101 and halogen-free are not mandated. |
Compared with SMAJ12AHE3/A and SMCJ12AHE3/I, the SMCJ12AHM3/I uniquely combines 1500 W surge capacity, AEC-Q101 qualification, and halogen-free construction - making it the only option qualified for high-reliability automotive power rail protection without design compromise.
Availability
SMCJ12AHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom power supplies, and consumer USB-C docking stations requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ12AHM3/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, efficiency, and application-specific optimization.
The SMCJ series was developed to deliver high-power transient suppression in compact surface-mount packages for automotive, industrial, and telecom infrastructure - balancing clamping performance, thermal robustness, and manufacturability.
FAQ
What is the clamping voltage of the SMCJ12AHM3/I under a 10/1000 µs surge?
The SMCJ12AHM3/I clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 75.4 A using the standardized 10/1000 µs waveform. This value is measured at the device terminals under specified test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ12AHM3/I maintains this clamping performance across its full operating temperature range.
Is the SMCJ12AHM3/I suitable for automotive applications?
Yes, the SMCJ12AHM3/I is AEC-Q101 qualified and carries the HM3 suffix indicating halogen-free, RoHS-compliant construction - explicitly intended for automotive use. It meets requirements for temperature cycling, high-temperature reverse bias, and ESD robustness per AEC-Q101. The SMCJ12AHM3/I is deployed in engine control units, body control modules, and ADAS power supplies where sustained reliability under under-hood thermal stress is mandatory.
How does the SMCJ12AHM3/I differ from the SMCJ12AHE3/I?
The SMCJ12AHM3/I and SMCJ12AHE3/I share identical electrical specifications (VWM = 12 V, VBR = 13.3–14.7 V, VC = 19.9 V) and SMC package, but differ in qualification and material compliance. The SMCJ12AHM3/I is AEC-Q101 qualified and halogen-free; the SMCJ12AHE3/I is commercial-grade only (E3 suffix) and contains halogens. Therefore, the SMCJ12AHM3/I is required for automotive designs, while the SMCJ12AHE3/I suffices for non-automotive industrial applications.
What is the thermal resistance of the SMCJ12AHM3/I, and how does it affect PCB layout?
The SMCJ12AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended pad layout: 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value directly dictates PCB copper area requirements - reducing pad size increases RθJA, risking thermal runaway during repetitive surges. For reliable operation at full 1500 W PPPM, the SMCJ12AHM3/I must be placed on thermally optimized land patterns with adequate copper pour and minimal trace length.
Does the SMCJ12AHM3/I have polarity marking, and how is it oriented in-circuit?
Yes, the SMCJ12AHM3/I is unidirectional and features a molded cathode band on the case - visible as a distinct black or dark stripe near one end. In-circuit, the cathode (banded end) connects to the line being protected (e.g., 12 V rail), while the anode connects to ground or return. This orientation ensures reverse-biased blocking during normal operation and forward conduction into clamping mode when transient voltage exceeds VBR. Reversing polarity renders the SMCJ12AHM3/I ineffective for overvoltage protection.
SMCJ12AHM3/I 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/I FAQ
1.How can I place an order for SMCJ12AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12AHM3/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 SMCJ12AHM3/I reliable?
The price and inventory of SMCJ12AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12AHM3/I is usually 5 days.
3.What payment methods are accepted for SMCJ12AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12AHM3/I?
SMCJ12AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12AHM3/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 SMCJ12AHM3/I?
For technical support, including SMCJ12AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12AHM3/I requirements.
6.How does Aetrix verify that SMCJ12AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMCJ12AHM3/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 SMCJ12AHM3/I meets industry standards.
7.What is the process for return or replacement of SMCJ12AHM3/I?
All SMCJ12AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12AHM3/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 SMCJ12AHM3/I part is unused and in its original packaging.
Return procedure for SMCJ12AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12AHM3/I Tags
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