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Vishay General Semiconductor - Diodes Division SMCJ12C-E3/9AT
- Part No.:
- SMCJ12C-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12C-E3/9AT.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,190
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Product details
Overview
SMCJ12C-E3/9AT from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection on signal and power lines. It features a 12 V stand-off voltage (VWM), 1500 W peak pulse power (PPPM), clamping voltage of 19.9 V at 75.4 A, AEC-Q101 qualification, and UL 497B recognition - used to protect automotive sensor interfaces and industrial I/O circuits against ESD and inductive switching transients.
For engineers reviewing the SMCJ12C-E3/9AT datasheet, SMCJ12C-E3/9AT pinout, SMCJ12C-E3/9AT application, or SMCJ12C-E3/9AT equivalent, key selection criteria include bi-directional clamping capability, 19.9 V VC at rated IPPM, DO-214AB thermal performance (RθJA = 75 °C/W), AEC-Q101 compliance for automotive use, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ12C-E3/9AT operates as a silicon avalanche diode with symmetrical breakdown characteristics in both polarities, enabling protection of AC-coupled or floating signal paths without polarity sensitivity. Its glass-passivated junction ensures stable leakage (<5 μA at VWM) and fast response (<1 ns) to transients up to 10/1000 μs waveform.
Thermally, it is rated for TJ = –55 °C to +150 °C and derates linearly above 25 °C ambient, with RθJL = 15 °C/W to leads. The device meets MSL Level 1 per J-STD-020 and supports reflow up to 260 °C peak, making it suitable for high-reliability automotive and industrial PCB assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 13.3 V / 14.7 V at 1.0 mA - guaranteed avalanche breakdown range for bi-directional conduction |
| VC @ IPPM | 19.9 V at 75.4 A - clamped voltage during 10/1000 μs surge, defining protected circuit's max stress level |
| PPPM | 1500 W - peak transient power handling capacity under standardized surge waveform |
| ID @ VWM | ≤5 μA - low leakage ensures minimal impact on high-impedance sensor or communication lines |
| TJ max | +150 °C - enables operation in under-hood automotive or industrial enclosures without derating |
| Package | DO-214AB (SMCJ) - surface-mount outline with 8.0 mm × 8.0 mm thermal pad footprint for effective heat dissipation |
Pinout & Package
SMCJ12C-E3/9AT uses the DO-214AB (SMCJ) package: a bi-directional surface-mount device with two terminals and no polarity marking. The case is molded in UL 94 V-0 compliant compound; terminals are matte tin-plated for solderability per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bi-directional avalanche junction | No functional distinction between terminals - either terminal serves as cathode or anode depending on transient polarity |
| Case (body) | Non-electrical mechanical interface | Provides thermal path to PCB copper pads; no electrical connection or grounding function |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Glass-passivated junction | Ensures stable VBR tolerance and low long-term parameter drift under thermal stress |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at 260 °C peak without moisture-related failure |
| UL 497B recognized (QVGQ2) | Meets safety requirements for telecom and industrial signal line protectors, simplifying system-level certification |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN, LIN, or analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional TVS placed across differential or single-ended signal lines upstream of receiver ICs. Use Value: Clamps transients to ≤19.9 V while sustaining 1500 W surges, preventing damage to downstream ASICs rated for <24 V absolute max. | Use Scenario: Shielding PLC digital input modules from field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input channels, mounted directly at connector entry point. Use Value: Withstands repeated 1 kV/500 A surges per IEC 61000-4-5 (Level 3), maintaining <5 μA leakage to avoid false triggering. |
| Telecom Line Protection | Consumer Power Adapter Input |
Use Scenario: Safeguarding Ethernet PHY interfaces or RS-485 transceivers against lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy with sub-ns response. Use Value: Symmetrical 13.3–14.7 V breakdown ensures equal clamping on positive/negative transients, preserving signal integrity on balanced lines. | Use Scenario: Input-stage surge suppression on 12 V wall adapters used in smart home hubs and IoT gateways. IC Role / Device Role / Timing Role: First-line defense against AC line transients coupled into DC output via transformer parasitics. Use Value: UL 497B recognition supports end-product safety certification; DO-214AB footprint allows compact layout with 8 mm² thermal pad for sustained 6.5 W dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-E3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), higher RθJA (~100 °C/W) | Suitable for space-constrained consumer designs with lower surge exposure; not recommended for automotive under-hood use | Select when board area is critical and peak surge energy is ≤600 W; verify thermal margin with 3.5 mm × 3.5 mm pads |
| 1.5KE12CA | Through-hole TO-218 package, same VWM/VC specs, higher IFSM (200 A), but no AEC-Q101 or MSL Level 1 rating | Used in legacy industrial power supplies where manual assembly or wave soldering is preferred | Choose only for non-automotive, non-SMT production; requires PCB hole drilling and lacks reflow compatibility |
Compared with SMCJ12C-E3/9AT, SMBJ12CA-E3/52T offers reduced footprint at the cost of thermal and surge performance, while 1.5KE12CA provides identical electrical specs in through-hole form but lacks automotive qualification and modern SMT process support.
Availability
SMCJ12C-E3/9AT is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line safeguarding requiring stable component supply across multi-year production cycles.
Supply support for SMCJ12C-E3/9AT 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, precision, and application-specific validation.
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 AEC-Q101 compliance and UL recognition are mandatory.
FAQ
What does the "C" suffix indicate in SMCJ12C-E3/9AT?
The "C" in SMCJ12C-E3/9AT denotes bi-directional configuration - meaning the device has symmetrical breakdown characteristics and clamps voltage transients of either polarity. Unlike uni-directional variants (e.g., SMCJ12A), it carries no polarity marking and is used where signal lines lack defined DC bias or require AC-coupled protection. This makes SMCJ12C-E3/9AT ideal for protecting differential buses like RS-485 or sensor bridges.
Is SMCJ12C-E3/9AT RoHS compliant and halogen-free?
Yes, SMCJ12C-E3/9AT is RoHS compliant per Directive 2011/65/EU and conforms to JEDEC JS709A for halogen-free materials. The "E3" suffix explicitly indicates commercial-grade RoHS compliance, and Vishay certifies that all E3-suffix parts meet both environmental standards without exception. No lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE substances exceed threshold limits.
What is the maximum clamping voltage of SMCJ12C-E3/9AT under surge conditions?
The maximum clamping voltage (VC) of SMCJ12C-E3/9AT is 19.9 V, measured at its peak pulse current (IPPM) of 75.4 A under a standardized 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case surge events and is guaranteed across the full operating temperature range (–55 °C to +150 °C).
Can SMCJ12C-E3/9AT be used in place of a uni-directional SMCJ12A?
No - SMCJ12C-E3/9AT is not a drop-in replacement for SMCJ12A due to fundamental polarity differences. While both share VWM = 12 V and similar VC, SMCJ12A is uni-directional with a cathode band and conducts only in reverse bias; SMCJ12C-E3/9AT is bi-directional with no polarity marking and clamps both polarities. Substitution requires layout review to ensure no DC bias conflicts arise.
What thermal pad layout is required for reliable operation of SMCJ12C-E3/9AT?
For reliable thermal performance, SMCJ12C-E3/9AT must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Smaller pads increase junction temperature and reduce surge endurance. The DO-214AB package relies on this pad area to achieve its rated RθJA = 75 °C/W and sustain 6.5 W continuous power dissipation at TA = 50 °C.
SMCJ12C-E3/9AT 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ12C-E3/9AT FAQ
1.How can I place an order for SMCJ12C-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12C-E3/9AT 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 SMCJ12C-E3/9AT reliable?
The price and inventory of SMCJ12C-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12C-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ12C-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12C-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12C-E3/9AT?
SMCJ12C-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12C-E3/9AT 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 SMCJ12C-E3/9AT?
For technical support, including SMCJ12C-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12C-E3/9AT requirements.
6.How does Aetrix verify that SMCJ12C-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ12C-E3/9AT 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 SMCJ12C-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ12C-E3/9AT?
All SMCJ12C-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12C-E3/9AT, 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 SMCJ12C-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ12C-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12C-E3/9AT Tags
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