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Vishay General Semiconductor - Diodes Division SMCJ12A-M3/9AT
- Part No.:
- SMCJ12A-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12A-M3/9AT.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,223
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Product details
Overview
SMCJ12A-M3/9AT from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown voltage (VBR) at 1 mA, 19.9 V maximum clamping voltage (VC) at 75.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMCJ12A-M3/9AT datasheet, SMCJ12A-M3/9AT pinout, SMCJ12A-M3/9AT application, or SMCJ12A-M3/9AT equivalent, this device is selected for robust overvoltage protection on DC power rails, I/O lines, and sensor interfaces where fast response (<1 ns), low clamping ratio, and AEC-Q101-qualified variants are critical - especially in automotive body control modules, industrial PLC inputs, and telecom power supplies.
Technical Context
The SMCJ12A-M3/9AT employs a glass-passivated silicon junction optimized for low incremental surge resistance and stable clamping under repetitive transient stress. Its unidirectional polarity uses a cathode band marking and exhibits forward voltage of 3.5 V at 100 A, enabling effective reverse-biased surge suppression without forward conduction during normal operation.
Thermally, it delivers RθJA = 75 °C/W and RθJL = 15 °C/W, supporting reliable operation up to TJ = +150 °C. The device meets MSL Level 1 per J-STD-020 with 260 °C reflow peak and is halogen-free and RoHS-compliant per suffix "M3".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V systems. |
| VBR @ IT = 1 mA | 13.3–14.7 V - Verified breakdown threshold ensuring predictable turn-on during transients; tight 10% tolerance supports consistent protection timing. |
| VC @ IPPM = 75.4 A | 19.9 V - Clamped voltage under 1500 W 10/1000 µs surge; limits downstream IC stress to ≤20 V during worst-case events. |
| PPPM | 1500 W - Peak pulse power handling capacity; enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V lines. |
| IFSM | 200 A - Non-repetitive forward surge rating (8.3 ms half-sine); supports fault-current withstand in power supply input stages. |
| TJ Range | −55 °C to +150 °C - Extended junction temperature range ensures reliability in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - Standardized 2-pin surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal design; compatible with automated placement. |
Pinout & Package
SMCJ12A-M3/9AT is housed in an SMC (DO-214AB) package: a molded, halogen-free, UL 94 V-0 compliant case with matte tin-plated leads solderable per J-STD-002. Polarity is unidirectional; the cathode is marked by a band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; completes clamping loop during transient events. |
| Cathode | Reverse-biased protection node | Connected to protected line (e.g., 12 V rail or signal); blocks normal operation but avalanches during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| Low-profile SMC package | Enables high-density PCB layouts and compatibility with standard pick-and-place equipment; footprint matches industry-standard DO-214AB land patterns. |
| 1500 W peak pulse power | Provides immunity to severe transients including ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 Combination Wave (4 kV) |
| 19.9 V clamping at 75.4 A | Ensures protected ICs (e.g., CAN transceivers, microcontrollers) remain below absolute maximum ratings during surge events on 12 V systems. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
| Halogen-free & RoHS-compliant (M3) | Fulfills environmental compliance mandates for automotive and industrial OEMs without compromising surge performance. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protects 12 V power rail and switch inputs in BCMs exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery feed and local regulator input; clamps within <1 ns to limit voltage excursion. Use Value: Prevents latch-up or destruction of LDOs and microcontrollers during ISO 7637-2 Pulse 5a (up to 60 V, 100 ms), maintaining system uptime. |
Use Scenario: Shields 24 V digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Mounted directly at connector entry point to shunt transient energy before reaching optocoupler or Schmitt trigger input stage. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) without external filtering, reducing BOM count. |
| Telecom Power Supply Output | Automotive Sensor Interface (e.g., ABS wheel speed) |
Use Scenario: Safeguards +12 V output of telecom DC-DC converters feeding baseband processors and RF front-ends. IC Role / Device Role / Timing Role: Placed downstream of output filter capacitor to suppress ringing and coupling-induced spikes from adjacent switching stages. Use Value: Maintains clean 12 V rail integrity under dynamic load steps and hot-swap events, preventing false resets or data corruption. |
Use Scenario: Protects analog signal path of active wheel speed sensors connected to ABS ECUs via long harnesses. IC Role / Device Role / Timing Role: Installed at ECU connector to clamp coupled transients from ignition noise or alternator ripple before signal conditioning amplifier. Use Value: Preserves signal fidelity and prevents false zero-crossing detection, ensuring accurate wheel speed reporting under harsh EMC conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A-M3/57T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VC specs | Suitable for space-constrained consumer or low-energy industrial ports; insufficient for automotive load dump. | Select when board area is limited and surge threat level is ≤IEC 61000-4-5 Level 2 (1 kV). |
| SMCJ12CA-M3/9AT | Bidirectional variant; identical VWM, VBR, VC, and PPPM; no polarity marking | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where bidirectional clamping is mandatory. | Choose only if protecting symmetric differential signals or ungrounded circuits; not interchangeable in unidirectional DC rails. |
Compared with SMCJ12A-M3/9AT, SMBJ12A-M3/57T trades surge robustness for compactness, while SMCJ12CA-M3/9AT provides identical clamping performance but requires circuit redesign to accommodate bidirectional operation - neither is pin-compatible without layout revision.
Availability
SMCJ12A-M3/9AT is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC inputs, and telecom power supply outputs requiring stable component supply, halogen-free compliance, and AEC-Q101-qualified alternatives.
Supply support for SMCJ12A-M3/9AT 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, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform engineered for high-energy transient suppression in automotive, industrial, and communications infrastructure - prioritizing low clamping voltage, fast response, and rugged packaging.
FAQ
What is the clamping voltage of SMCJ12A-M3/9AT at its rated peak pulse current?
The SMCJ12A-M3/9AT has a maximum clamping voltage (VC) of 19.9 V at 75.4 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per JEDEC standards and guarantees that protected downstream circuitry remains below critical voltage thresholds during standardized surge events. The SMCJ12A-M3/9AT achieves this with minimal voltage overshoot due to its low incremental surge resistance.
Is SMCJ12A-M3/9AT suitable for automotive applications?
Yes, the SMCJ12A-M3/9AT is halogen-free and RoHS-compliant per its "M3" suffix, and an AEC-Q101-qualified version (e.g., SMCJ12A-HM3/9AT) is available. While the base SMCJ12A-M3/9AT itself is commercial-grade, its electrical specs - including 1500 W PPPM, −55 °C to +150 °C operating range, and MSL Level 1 - align with automotive subsystem requirements such as body electronics and sensor interfaces. Always verify qualification status for safety-critical use.
How does the SMCJ12A-M3/9AT differ from the SMCJ12CA-M3/9AT?
The SMCJ12A-M3/9AT is unidirectional with a cathode band marking and conducts only in reverse avalanche; the SMCJ12CA-M3/9AT is bidirectional with no polarity marking and clamps symmetrically in both directions. Both share identical VWM (12 V), VBR, VC, and PPPM (1500 W), but the SMCJ12CA-M3/9AT is required for AC-coupled or floating signal lines like CAN or RS-485. They are not interchangeable without circuit review.
What is the thermal resistance of SMCJ12A-M3/9AT, and how does it affect PCB layout?
The SMCJ12A-M3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W and junction-to-lead (RθJL) of 15 °C/W. To maintain safe junction temperatures under repeated surges, PCB layout must use minimum 8.0 mm × 8.0 mm copper pads per terminal as specified in the datasheet. Reducing pad size increases RθJA, risking thermal runaway during high-duty-cycle transients.
Can SMCJ12A-M3/9AT be used in place of SMAJ12A?
No - the SMCJ12A-M3/9AT and SMAJ12A differ in package (SMC vs. SMA), power rating (1500 W vs. 400 W), and thermal performance. The SMCJ12A-M3/9AT requires larger PCB pads and delivers higher surge robustness, making it unsuitable as a drop-in replacement for SMAJ12A without layout and thermal validation. Using SMCJ12A-M3/9AT in an SMA footprint risks solder joint failure and inadequate heat dissipation.
SMCJ12A-M3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ12A-M3/9AT FAQ
1.How can I place an order for SMCJ12A-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12A-M3/9AT 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 SMCJ12A-M3/9AT reliable?
The price and inventory of SMCJ12A-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12A-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ12A-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12A-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12A-M3/9AT?
SMCJ12A-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12A-M3/9AT 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 SMCJ12A-M3/9AT?
For technical support, including SMCJ12A-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12A-M3/9AT requirements.
6.How does Aetrix verify that SMCJ12A-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ12A-M3/9AT 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 SMCJ12A-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ12A-M3/9AT?
All SMCJ12A-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12A-M3/9AT, 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 SMCJ12A-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ12A-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12A-M3/9AT Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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