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Vishay General Semiconductor - Diodes Division SMCJ12CA/57T
- Part No.:
- SMCJ12CA/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12CA/57T.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,711
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Product details
Overview
SMCJ12CA/57T from Vishay General Semiconductor is a bi-directional 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), 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 power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMCJ12CA/57T datasheet, SMCJ12CA/57T pinout, SMCJ12CA/57T application, or SMCJ12CA/57T equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, UL 497B recognition, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ12CA/57T operates as a silicon avalanche diode with symmetrical breakdown behavior in both polarities, enabling protection against positive and negative transients without polarity dependency. Its glass-passivated junction ensures stable leakage (<1 μA at VWM) and low incremental surge resistance, critical for fast response to ESD and load-dump events.
Designed for surface-mount use in high-reliability environments, it meets J-STD-020 MSL Level 1 (260 °C peak reflow), supports 150 °C maximum junction temperature, and delivers consistent clamping performance across -55 °C to +150 °C operating range - validated per ANSI/IEEE C62.35 standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse stand-off voltage before clamping initiates |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown voltage window defining turn-on threshold |
| VC @ IPPM | 19.9 V at 75.4 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 1500 W - peak transient power handling capacity under standardized surge waveform |
| ID @ VWM | ≤1 μA - ultra-low reverse leakage ensuring minimal standby power loss |
| TJ max | +150 °C - maximum junction temperature supporting operation in under-hood automotive zones |
| MSL Level | Level 1 per J-STD-020 - no dry-pack or bake requirement prior to reflow soldering |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, bi-directional device with no polarity marking - terminals are symmetric and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (both ends) | Bi-directional transient conduction path | Either terminal serves as cathode or anode depending on transient polarity; no band marking required |
| Case (body) | Non-electrical mechanical interface | DO-214AB molded body provides UL 94 V-0 flammability rating and thermal path to PCB copper pads |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validated reliability for automotive powertrain and chassis applications per stress test requirements |
| UL 497B recognition (QVGQ2) | Meets Underwriters Laboratories requirements for telecom and data line protectors |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term leakage stability under thermal cycling |
| Low Rsurge | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a/5a) |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protection of 12 V battery-fed control modules against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS placed directly at connector entry point to shunt surges before reaching MCU or CAN transceiver. Use Value: Clamps 12 V system transients to ≤19.9 V, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. | Use Scenario: Shielding analog output (4–20 mA) and digital I/O (RS-485) lines in factory-floor pressure/temperature sensors. IC Role / Device Role / Timing Role: Bi-directional transient suppressor bridging signal pair to ground, absorbing EFT and surge coupling. Use Value: Maintains signal integrity by limiting common-mode transients to <20 V while adding <0.5 pF capacitance at 0 V bias. |
| Telecom Interface Protection | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHY or DSL line drivers against lightning-induced surges on outdoor-facing ports. IC Role / Device Role / Timing Role: Primary-level TVS on line-side of isolation transformer, rated for UL 497B Class B compliance. Use Value: Absorbs up to 1500 W surge energy without degradation, preserving signal amplitude and jitter margin. | Use Scenario: Input-stage surge suppression in wall-mounted USB-C PD adapters exposed to mains-borne transients. IC Role / Device Role / Timing Role: First-line clamp on secondary-side DC bus (12 V rail), coordinated with fuse and MOV. Use Value: Prevents catastrophic failure of synchronous rectifiers and PWM controllers during 1 kV/0.5 J line-to-ground surges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA | Lower PPPM (400 W), smaller DO-214AC (SMA) package, higher Rsurge | Suitable only for lower-energy transients (IEC 61000-4-2 contact discharge ≤8 kV) | Select SMAJ12CA only when board space is constrained and surge threat level is limited to consumer-grade immunity. |
| SMCJ12A | Uni-directional variant; includes cathode band marking; same VWM/VC/PPPM but asymmetric conduction | Requires correct polarity orientation; unsuitable for AC or floating nodes | Choose SMCJ12A only for DC rails with known polarity and where reverse conduction must be blocked. |
Compared with SMAJ12CA and SMCJ12A, the SMCJ12CA/57T delivers full 1500 W bi-directional clamping in a thermally optimized DO-214AB package, making it the preferred choice for AEC-Q101-compliant automotive and industrial systems requiring robust, polarity-agnostic surge immunity.
Availability
SMCJ12CA/57T is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom line cards, and consumer power adapter designs requiring stable component supply and traceable sourcing.
Supply support for SMCJ12CA/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, MOSFETs, optoelectronics, and passive components 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 where failure modes must be mitigated without compromising signal fidelity.
FAQ
What is the clamping voltage of the SMCJ12CA/57T under a 10/1000 µs surge?
The SMCJ12CA/57T clamps to a maximum of 19.9 V when subjected to its rated peak pulse current of 75.4 A using the standard 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 SMCJ12CA/57T maintains this clamping performance consistently across its qualified temperature range.
Is the SMCJ12CA/57T suitable for automotive applications?
Yes, the SMCJ12CA/57T is AEC-Q101 qualified and UL 497B recognized, making it suitable for automotive power distribution modules, body control units, and sensor interfaces exposed to load dump, jump start, and ISO 7637-2 transients. Its DO-214AB package supports MSL Level 1 reflow, and its 150 °C maximum junction temperature aligns with under-hood thermal requirements. The SMCJ12CA/57T is explicitly listed in Vishay's AEC-Q101 qualified product matrix.
Does the SMCJ12CA/57T have polarity markings?
No, the SMCJ12CA/57T is a bi-directional TVS diode and carries no polarity marking - the DO-214AB package has identical terminals with symmetrical electrical behavior in both directions. Unlike uni-directional variants (e.g., SMCJ12A), it does not feature a cathode band. This design eliminates orientation errors during automated placement and simplifies layout for AC-coupled or floating circuits. The SMCJ12CA/57T functions identically regardless of PCB pad assignment.
What is the maximum reverse leakage current of the SMCJ12CA/57T at its stand-off voltage?
The SMCJ12CA/57T exhibits a maximum reverse leakage current (ID) of 1.0 μA when biased at its 12 V stand-off voltage (VWM), measured at TA = 25 °C. This ultra-low leakage ensures negligible standby power draw and avoids false triggering in high-impedance sensing circuits. The specification is verified per the manufacturer's electrical characteristics table and applies across the full operating temperature range when derated per thermal curves. The SMCJ12CA/57T maintains this performance due to its glass-passivated junction construction.
Can the SMCJ12CA/57T be used in place of a uni-directional TVS like SMCJ12A?
The SMCJ12CA/57T can replace SMCJ12A only in circuits where bi-directional clamping is acceptable or required - such as AC signal paths, differential buses, or floating grounds. It must not be substituted in DC-only rails where reverse conduction could cause unintended current flow or latch-up. While both share identical VWM, VC, and PPPM ratings, the SMCJ12CA/57T lacks polarity marking and conducts equally in both directions. Always verify node topology before substituting the SMCJ12CA/57T for SMCJ12A.
SMCJ12CA/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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 (SMCJ)
SMCJ12CA/57T FAQ
1.How can I place an order for SMCJ12CA/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12CA/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 SMCJ12CA/57T reliable?
The price and inventory of SMCJ12CA/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12CA/57T is usually 5 days.
3.What payment methods are accepted for SMCJ12CA/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12CA/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12CA/57T?
SMCJ12CA/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12CA/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 SMCJ12CA/57T?
For technical support, including SMCJ12CA/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12CA/57T requirements.
6.How does Aetrix verify that SMCJ12CA/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ12CA/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 SMCJ12CA/57T meets industry standards.
7.What is the process for return or replacement of SMCJ12CA/57T?
All SMCJ12CA/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12CA/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 SMCJ12CA/57T part is unused and in its original packaging.
Return procedure for SMCJ12CA/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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