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Vishay General Semiconductor - Diodes Division SMCJ12AHE3/57T
- Part No.:
- SMCJ12AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12AHE3/57T.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,852
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Product details
Overview
SMCJ12AHE3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 12 V standoff voltage (VWM), 19.9 V clamping voltage (VC) at 75.4 A peak pulse current, and 1500 W peak pulse power rating with a 10/1000 µs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ12AHE3/57T datasheet, SMCJ12AHE3/57T pinout, SMCJ12AHE3/57T application, or SMCJ12AHE3/57T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, SMC (DO-214AB) package compatibility, and verified clamping performance under repetitive surge stress per IEC 61000-4-5.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds the 13.3–14.7 V breakdown range (VBR at 1 mA), it avalanches to divert surge energy away from downstream ICs. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, lightning-induced transients, and inductive switching spikes.
Designed for surface-mount assembly on standard PCB copper pads (8.0 mm × 8.0 mm per terminal), the device meets MSL Level 1 per J-STD-020, supports 260 °C lead-free reflow, and delivers stable operation across –55 °C to +150 °C junction temperature range - critical for under-hood automotive and industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before leakage exceeds 5 µA; sets upper limit for protected line's nominal DC rail. |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - guaranteed avalanche initiation window; ensures predictable turn-on without premature conduction. |
| VC @ IPPM | 19.9 V at 75.4 A - clamped voltage during full 1500 W surge; defines worst-case overvoltage seen by protected circuitry. |
| PPPM | 1500 W - peak pulse power handling with 10/1000 µs waveform; validates compliance with IEC 61000-4-5 Level 4 (4 kV) testing. |
| TJ max. | +150 °C - maximum junction temperature; enables use in high-ambient environments like engine control units without derating. |
| Package | SMC (DO-214AB) - standardized 2-pin surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ12AHE3/57T uses the SMC (DO-214AB) package: a molded, RoHS-compliant, halogen-free case with matte tin-plated leads solderable per J-STD-002. Polarity is marked by a cathode band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or return path; completes shunt path during avalanche conduction. |
| Cathode | Protected line interface | Connected to the line being protected (e.g., 12 V supply rail); carries surge current into anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias HAST, and mechanical shock - required for ECU, ADAS, and infotainment systems. |
| Glass passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives, reducing parameter drift over 15+ year service life. |
| MSL Level 1 rating | Enables single-pass lead-free reflow at 260 °C without preconditioning - eliminates production delays and moisture-related popcorning defects. |
| Low clamping ratio (VC/VBR) | 1.42 (19.9 V / 14.05 V avg) - minimizes overvoltage overshoot during surge events, protecting 15 V-tolerant logic and analog front-ends. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against load dump transients up to 35 V. IC Role / Device Role / Timing Role: Shunt clamping element placed between VIN and GND, conducting only during overvoltage events to clamp rail to ≤19.9 V. Use Value: Prevents MCU brownout or latch-up during ISO 7637-2 Pulse 5a (load dump), enabling uninterrupted operation without external crowbar circuits. | Use Scenario: Safeguarding 4–20 mA current loop transmitter outputs from field wiring surges in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS placed across output terminals to absorb induced common-mode transients on twisted-pair cabling. Use Value: Maintains loop accuracy within ±0.1% by limiting voltage excursion to <20 V during IEC 61000-4-4 EFT bursts, avoiding op-amp saturation or DAC damage. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Securing –48 V DC input stage of telecom base station power converters against lightning-induced surges on outdoor feeder lines. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-rail, cathode-to-GND to clamp negative-going transients on the return path. Use Value: Withstands 1500 W pulses without degradation, meeting Telcordia GR-1089-CORE Level 3 requirements for central office equipment. | Use Scenario: Adding secondary overvoltage protection on USB VBUS line in portable medical monitors exposed to ESD in clinical environments. IC Role / Device Role / Timing Role: Low-capacitance (≈150 pF) shunt device placed upstream of USB controller to clamp contact ESD per IEC 61000-4-2 ±15 kV. Use Value: Limits VBUS overshoot to <20 V during 150 pF/330 Ω discharge, preventing PHY latch-up while maintaining USB 2.0 signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A-E3/57T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher VC (23.2 V at 17.3 A) | Not rated for AEC-Q101; limited to consumer/industrial use where surge energy is lower. | Select when board space is constrained and surge threat level is ≤IEC 61000-4-5 Level 2 (2 kV). |
| SMCJ12CAHE3/57T | Bidirectional variant; identical VWM, VBR, and VC specs but symmetric clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs. | Choose when protecting differential buses or ungrounded sensors where bidirectional transients dominate. |
Compared with SMAJ12A-E3/57T, SMCJ12AHE3/57T delivers 3.75× higher surge power handling and automotive qualification; versus SMCJ12CAHE3/57T, it offers lower cost and simpler layout for unidirectional DC rails but cannot suppress positive/negative surges on the same line without polarity awareness.
Availability
SMCJ12AHE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom infrastructure requiring stable component supply with AEC-Q101 traceability and long-lifecycle support.
Supply support for SMCJ12AHE3/57T 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 was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure tolerance, thermal stability, and surge repeatability are non-negotiable.
FAQ
What is the clamping voltage of SMCJ12AHE3/57T at its rated peak pulse current?
The SMCJ12AHE3/57T has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 75.4 A, measured using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on the protected circuit during a full-power transient event and is confirmed in the Vishay datasheet revision 09-Jan-2024, page 2. The SMCJ12AHE3/57T maintains this clamping performance across its full operating temperature range.
Is SMCJ12AHE3/57T qualified for automotive applications?
Yes, SMCJ12AHE3/57T is AEC-Q101 qualified, as indicated by the "HE3" suffix in its part number and confirmed in the Vishay datasheet footnote on page 3. This qualification covers stress tests including temperature cycling, high-temperature operating life, and unbiased highly accelerated stress testing - making the SMCJ12AHE3/57T suitable for engine control units, body electronics, and ADAS modules where automotive-grade reliability is mandatory.
What package type does SMCJ12AHE3/57T use, and what are its key mechanical dimensions?
SMCJ12AHE3/57T uses the SMC (DO-214AB) package: a surface-mount outline measuring 7.75 mm × 6.22 mm in footprint with a maximum height of 2.62 mm. Per the Vishay package drawing on page 5, it features a cathode band marking, matte tin-plated leads, and is rated MSL Level 1 for lead-free reflow. The SMCJ12AHE3/57T's pad layout requires 8.0 mm × 8.0 mm copper areas per terminal to achieve full 1500 W rating.
How does the breakdown voltage range of SMCJ12AHE3/57T compare to its standoff voltage?
The SMCJ12AHE3/57T has a standoff voltage (VWM) of 12 V and a minimum breakdown voltage (VBR) of 13.3 V at 1 mA test current - providing a 1.3 V design margin to prevent false triggering during normal operation. Its VBR range spans 13.3 V to 14.7 V, ensuring reliable avalanche onset well above the 12 V rail while maintaining tight distribution for consistent system-level protection behavior. This margin is explicitly defined in the Electrical Characteristics table on page 2 of the Vishay datasheet for SMCJ12AHE3/57T.
Can SMCJ12AHE3/57T be used in bidirectional signal protection applications?
No, SMCJ12AHE3/57T is a unidirectional TVS diode - its cathode band indicates polarity, and it conducts only when the cathode is at higher potential than the anode. For bidirectional protection (e.g., RS-485, CAN, or AC lines), the bidirectional variant SMCJ12CAHE3/57T must be used. The SMCJ12AHE3/57T datasheet explicitly states "unidirectional" in the DEVICE TYPE column and specifies polarity marking, confirming its single-direction functionality.
SMCJ12AHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ12AHE3/57T FAQ
1.How can I place an order for SMCJ12AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12AHE3/57T 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 SMCJ12AHE3/57T reliable?
The price and inventory of SMCJ12AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12AHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ12AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12AHE3/57T?
SMCJ12AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12AHE3/57T 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 SMCJ12AHE3/57T?
For technical support, including SMCJ12AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12AHE3/57T requirements.
6.How does Aetrix verify that SMCJ12AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ12AHE3/57T 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 SMCJ12AHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ12AHE3/57T?
All SMCJ12AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12AHE3/57T, 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 SMCJ12AHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ12AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12AHE3/57T Tags
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