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Vishay General Semiconductor - Diodes Division SMCJ12CHE3/9AT
- Part No.:
- SMCJ12CHE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12CHE3/9AT.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,343
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Product details
Overview
SMCJ12CHE3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) 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, 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 - deployed on automotive power rails and industrial sensor interfaces.
For engineers reviewing the SMCJ12CHE3/9AT datasheet, SMCJ12CHE3/9AT pinout, SMCJ12CHE3/9AT application, or SMCJ12CHE3/9AT equivalent, this page delivers verified electrical specs, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), RoHS-compliant matte tin plating, and JEDEC JESD201 Class 2 whisker resistance - all critical for automotive-grade ESD/surge design validation.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: it remains high-impedance below 12 V (VWM), breaks down within 13.3–14.7 V (VBR) at 1 mA test current, and clamps transients to ≤19.9 V at 75.4 A (IPPM) under standardized 10/1000 µs surge. Its glass-passivated junction ensures stable leakage (<5 µA at VWM) and fast response time (<1 ns).
Thermally, it supports operation from –55 °C to +150 °C (TJ max), with RθJL = 15 °C/W enabling effective heat transfer to PCB copper pads. The HE3 suffix confirms AEC-Q101 qualification and JESD201 Class 2 whisker resistance - essential for automotive under-hood and ADAS subsystems requiring long-term reliability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before conduction begins; defines safe working margin for 12 V nominal systems. |
| VBR min/max | 13.3 V / 14.7 V at IT = 1 mA - guaranteed breakdown range ensuring predictable turn-on during transients. |
| VC @ IPPM | 19.9 V at 75.4 A - clamping voltage limits downstream IC stress during 1500 W surges (10/1000 µs). |
| PPPM | 1500 W - peak pulse power handling capacity per single transient event per JEDEC standards. |
| ID @ VWM | ≤5 µA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss. |
| TJ max | +150 °C - enables deployment in high-temperature automotive engine compartments and industrial motor drives. |
| RθJA | 75 °C/W - thermal resistance to ambient on standard 8 mm × 8 mm copper pads; informs heatsinking requirements. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 durability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (uni-directional) | Connected to protected line side; conducts only when cathode is > anode by ≥VBR. |
| Cathode | Reverse-biased terminal (marked with band) | Connected to ground or low-impedance return path; defines polarity-sensitive clamping direction. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and infotainment power rails. |
| Glass passivated junction | Ensures stable VBR tolerance, low leakage drift over temperature, and long-term reliability in humid environments. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2/5a), improving protection margin. |
| JESD201 Class 2 whisker resistance | Prevents tin whisker growth under thermal cycling, critical for 15+ year automotive service life. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump (ISO 7637-2 Pulse 5a) and alternator switching transients. IC Role / Device Role / Timing Role: Shunt clamping TVS placed between power rail and chassis ground, activated within nanoseconds of overvoltage onset. Use Value: Limits rail voltage to ≤19.9 V during 1500 W surges, preventing damage to MCU, CAN transceivers, and voltage regulators. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Bidirectional protection not applicable; SMCJ12CHE3/9AT used unidirectionally on supply-side of sensor front-end to block positive-going spikes. Use Value: Maintains signal fidelity with <5 µA leakage at 12 V, while clamping ESD events (IEC 61000-4-2 ±15 kV contact) to safe levels. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Protection |
Use Scenario: Securing 12 V DC input of base station remote radio units exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of DC-DC converters and PMICs; absorbs energy before downstream filtering. Use Value: Withstands 200 A non-repetitive forward surge (IFSM), enabling robust defense against multi-event surge sequences. |
Use Scenario: Adding secondary overvoltage protection on the 12 V output of wall-mounted AC/DC adapters for smart home hubs. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to common ground, triggered only during positive excursions beyond 12 V. Use Value: UL 497B recognized (QVGQ2 file E136766) ensures compliance with safety standards for end-product certification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12AHE3/9AT | Lower PPPM (400 W), smaller DO-214AC (SMA) package, same VWM/VBR/VC specs. | Reduced surge handling; suitable only for lower-energy threats (e.g., ESD-only, not load dump). | Select when board space is constrained and threat level is limited to IEC 61000-4-2/4-4, not ISO 7637-2. |
| SMCJ12A-E3/9AT | Same electrical specs and DO-214AB package, but commercial-grade (non-AEC-Q101, JESD201 Class 1). | Lacks automotive qualification; not approved for under-hood or safety-critical vehicle systems. | Choose for cost-sensitive industrial or consumer designs where AEC-Q101 is not mandated. |
Compared with SMCJ12A-E3/9AT and SMAJ12AHE3/9AT, the SMCJ12CHE3/9AT uniquely combines 1500 W surge capability, AEC-Q101 qualification, and JESD201 Class 2 whisker resistance - making it the only option qualified for demanding automotive power rail protection without derating or secondary components.
Availability
SMCJ12CHE3/9AT is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supplies requiring stable component supply across extended product lifecycles.
Supply support for SMCJ12CHE3/9AT 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability and automotive-grade qualification.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 compliance and repeatable clamping performance.
FAQ
What does the "HE3" suffix mean in SMCJ12CHE3/9AT?
The HE3 suffix in SMCJ12CHE3/9AT indicates RoHS-compliant construction with AEC-Q101 qualification and JESD201 Class 2 whisker resistance. Unlike the E3 variant, HE3 guarantees automotive-grade reliability, including enhanced thermal cycling endurance and tin whisker mitigation - critical for under-hood deployment where SMCJ12CHE3/9AT must operate continuously at up to +150 °C junction temperature.
Is SMCJ12CHE3/9AT suitable for bi-directional transient protection?
No, SMCJ12CHE3/9AT is a unidirectional TVS diode, as confirmed by its "A" suffix and cathode band marking. It protects only against positive-going transients on the anode-to-cathode path. For bi-directional protection, Vishay specifies the "CA" suffix (e.g., SMCJ12CA); using SMCJ12CHE3/9AT in reverse-biased configurations risks permanent failure due to lack of symmetric breakdown characteristics.
What is the maximum clamping voltage of SMCJ12CHE3/9AT under surge conditions?
The maximum clamping voltage (VC) of SMCJ12CHE3/9AT is 19.9 V at 75.4 A peak pulse current (IPPM), measured with a 10/1000 µs waveform. This value is guaranteed across temperature and lifetime, ensuring downstream components like 16 V-rated LDOs or CAN transceivers remain within safe operating limits during standardized surge events defined in ISO 7637-2 and IEC 61000-4-5.
How does the thermal resistance of SMCJ12CHE3/9AT affect PCB layout?
SMCJ12CHE3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under full 1500 W surge duty, designers must ensure adequate copper area and avoid thermal bottlenecks - undersized pads or internal layer isolation will cause excessive junction heating and premature thermal runaway during repeated transients.
Does SMCJ12CHE3/9AT meet UL 497B recognition requirements?
Yes, SMCJ12CHE3/9AT is Underwriters Laboratories (UL) recognized under file E136766 for protectors per UL 497B, covering both unidirectional and bidirectional variants in the SMCJ family. This recognition validates its use in end-equipment requiring safety agency approval - such as automotive infotainment head units and industrial programmable logic controllers - without requiring additional system-level surge testing.
SMCJ12CHE3/9AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 22V
- Current - Peak Pulse (10/1000µs):
- 68.2A
- 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)
SMCJ12CHE3/9AT FAQ
1.How can I place an order for SMCJ12CHE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12CHE3/9AT 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 SMCJ12CHE3/9AT reliable?
The price and inventory of SMCJ12CHE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12CHE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ12CHE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12CHE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12CHE3/9AT?
SMCJ12CHE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12CHE3/9AT 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 SMCJ12CHE3/9AT?
For technical support, including SMCJ12CHE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12CHE3/9AT requirements.
6.How does Aetrix verify that SMCJ12CHE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ12CHE3/9AT 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 SMCJ12CHE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ12CHE3/9AT?
All SMCJ12CHE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12CHE3/9AT, 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 SMCJ12CHE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ12CHE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12CHE3/9AT Tags
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