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Vishay General Semiconductor - Diodes Division SMCJ12A-M3/57T
- Part No.:
- SMCJ12A-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12A-M3/57T.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ12A-M3/57T 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 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 SMCJ12A-M3/57T datasheet, SMCJ12A-M3/57T pinout, SMCJ12A-M3/57T application, or SMCJ12A-M3/57T equivalent, this device is selected for high-energy surge immunity in automotive power supplies, industrial sensor interfaces, and telecom front-end protection where low clamping voltage, fast response (<1 ns), and AEC-Q101 qualification readiness are critical.
Technical Context
The SMCJ12A-M3/57T operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response to transients. Its clamping action limits voltage excursions during ESD, lightning-induced surges, or inductive switching events while maintaining low incremental surge resistance (typical <0.1 Ω).
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W, enabling reliable performance on standard PCB copper pads (8.0 mm × 8.0 mm per terminal). The M3 suffix confirms halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail margin for 12 V systems. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on under transient stress. |
| VC @ IPPM | 19.9 V at 75.4 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress below 20 V threshold. |
| PPPM | 1500 W - Peak pulse power handling capability; supports IEC 61000-4-5 Level 4 (4 kV/2 Ω) surge compliance. |
| ID @ VWM | 5 µA max - Ultra-low reverse leakage at rated stand-off; preserves battery life and signal integrity in always-on circuits. |
| TJ max. | +150 °C - Extended thermal rating enables use in under-hood automotive and industrial environments. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated placement. |
Pinout & Package
SMCJ12A-M3/57T uses the SMC (DO-214AB) package: a two-terminal, unidirectional surface-mount device with cathode indicated by a band on the body. Terminals are matte tin-plated, solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes conduction path during reverse-biased transient clamp. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); polarity band identifies this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables single-device protection against severe surges (e.g., ISO 7637-2 Pulse 5a) without cascaded TVS stages. |
| 19.9 V clamping at 75.4 A | Keeps protected circuitry below 20 V during worst-case 10/1000 µs transients, safeguarding 16 V-tolerant ICs. |
| Low 5 µA max ID at VWM | Minimizes standby power loss in battery-backed or energy-sensitive applications like automotive ECUs. |
| Halogen-free, RoHS-compliant (M3) | Meets environmental compliance requirements for global automotive and industrial OEMs without compromising surge performance. |
| MSL Level 1, 260 °C reflow | Supports lead-free assembly without moisture sensitivity concerns or pre-bake requirements. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) and body control modules (BCMs) against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed directly at power entry point to shunt surge energy to ground. Use Value: Limits voltage to ≤19.9 V during 75.4 A surges, preventing latch-up or permanent damage to downstream PMICs and microcontrollers. | Use Scenario: Shielding analog input lines of pressure or temperature sensors in factory automation PLCs from EFT and surge coupling. IC Role / Device Role / Timing Role: Fast-response transient suppressor on sensor signal traces, positioned before ADC input or op-amp buffer. Use Value: Sub-nanosecond response and low clamping voltage preserve signal fidelity and prevent false triggering in precision measurement circuits. |
| Telecom DC Power Input | Consumer Device USB Port Protection |
Use Scenario: Safeguarding 12 V DC input of PoE-powered network switches and base stations exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC feed, coordinated with upstream fuses and secondary filtering. Use Value: 1500 W PPPM rating allows compliance with IEC 61000-4-5 Ed.3 4 kV line-to-ground test without derating or parallel devices. | Use Scenario: Adding surge resilience to 12 V auxiliary power inputs on smart home hubs or gaming peripherals with external adapters. IC Role / Device Role / Timing Role: Standalone TVS on VBUS line to absorb plug/unplug transients and nearby ESD events. Use Value: Low 5 µA leakage avoids battery drain in always-connected devices; SMC package fits tight board space near connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC12A-TB-E3/57T | Same VWM (12 V), lower PPPM (600 W), higher VC (24.4 V at 24.6 A), DO-214AC (SMA) package. | Lower surge capacity suits cost-sensitive consumer electronics; not suitable for automotive load dump. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD only. |
| SMCJ12CA-M3/57T | Bidirectional variant with identical VWM (12 V), same PPPM (1500 W), but symmetric clamping (VC = 19.9 V in both directions). | Required for AC-coupled or bidirectional signal lines (e.g., RS-485, CAN bus); unsuitable for DC-only rails. | Choose only if protecting differential or alternating-polarity signals-unidirectional SMCJ12A-M3/57T is optimal for DC power rails. |
Compared with SAC12A-TB-E3/57T and SMCJ12CA-M3/57T, the SMCJ12A-M3/57T delivers superior surge energy handling in a unidirectional configuration ideal for 12 V DC power protection, balancing clamping performance, thermal robustness, and automotive-grade reliability without requiring layout changes for SMC footprint compatibility.
Availability
SMCJ12A-M3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface design, and telecom DC input protection requiring stable component supply across production lifecycles.
Supply support for SMCJ12A-M3/57T 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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, repeatable clamping, and long-term stability under thermal cycling are essential.
FAQ
What is the maximum clamping voltage of the SMCJ12A-M3/57T under a 10/1000 µs surge?
The SMCJ12A-M3/57T has a maximum clamping voltage (VC) of 19.9 V when subjected to its rated peak pulse current of 75.4 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in Vishay's Document Number 88394. The SMCJ12A-M3/57T maintains this clamping performance across its full operating temperature range (–55 °C to +150 °C), making it suitable for demanding under-hood automotive applications.
Is the SMCJ12A-M3/57T AEC-Q101 qualified?
The SMCJ12A-M3/57T is halogen-free and RoHS-compliant (M3 suffix) but is not AEC-Q101 qualified. For automotive-grade qualification, Vishay offers the SMCJ12A-HM3_X variant (e.g., SMCJ12A-HM3_A), which carries the HM3 suffix and explicit AEC-Q101 certification noted in the ordering information table. The SMCJ12A-M3/57T remains appropriate for industrial and commercial applications requiring high surge immunity without formal automotive qualification.
What does the "/57T" suffix indicate in SMCJ12A-M3/57T?
Per Vishay's ordering information, the "/57T" suffix denotes packaging in a 7-inch diameter plastic tape and reel, with a base quantity of 850 units per reel. This format supports automated SMT placement and is standardized across the SMCJ family. The SMCJ12A-M3/57T uses the same reel dimensions and carrier tape specifications as other SMC-packaged devices, ensuring compatibility with standard pick-and-place equipment.
How does the SMCJ12A-M3/57T compare to the SMCJ12CA-M3/57T?
The SMCJ12A-M3/57T is unidirectional, while the SMCJ12CA-M3/57T is bidirectional-identical in VWM (12 V), PPPM (1500 W), and VC (19.9 V), but symmetric in conduction. The SMCJ12A-M3/57T must be oriented with cathode toward the protected line; the CA version has no polarity marking and protects both polarities. Use SMCJ12A-M3/57T for DC rails and SMCJ12CA-M3/57T for AC or differential lines. Both share the same SMC (DO-214AB) package and M3 environmental compliance.
What is the thermal resistance from junction to ambient for the SMCJ12A-M3/57T?
The SMCJ12A-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal. This value assumes still air conditions and is critical for calculating maximum power dissipation at elevated ambient temperatures. The SMCJ12A-M3/57T also exhibits RθJL = 15 °C/W (junction-to-lead), supporting efficient heat transfer through solder joints into the PCB plane.
SMCJ12A-M3/57T 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-M3/57T FAQ
1.How can I place an order for SMCJ12A-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12A-M3/57T 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-M3/57T reliable?
The price and inventory of SMCJ12A-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12A-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ12A-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12A-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12A-M3/57T?
SMCJ12A-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12A-M3/57T 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-M3/57T?
For technical support, including SMCJ12A-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12A-M3/57T requirements.
6.How does Aetrix verify that SMCJ12A-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ12A-M3/57T 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-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ12A-M3/57T?
All SMCJ12A-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12A-M3/57T, 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-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ12A-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12A-M3/57T Tags
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