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Vishay General Semiconductor - Diodes Division SMCJ12-E3/57T
- Part No.:
- SMCJ12-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12-E3/57T.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,215
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Product details
Overview
SMCJ12-E3/57T 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 standoff voltage (VWM), 13.3–14.7 V breakdown range (VBR at 1 mA), 19.9 V clamping voltage (VC) at 75.4 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMCJ12-E3/57T datasheet, SMCJ12-E3/57T pinout, SMCJ12-E3/57T application, or SMCJ12-E3/57T equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ12-E3/57T operates as a silicon avalanche diode that enters breakdown when reverse voltage exceeds its VBR threshold, diverting surge current away from protected circuitry. Its low incremental surge resistance and very fast response time (<1 ns) enable effective suppression of transients from inductive switching, ESD, and lightning-induced surges.
Designed for surface-mount use in high-reliability environments, it supports junction temperatures from –55 °C to +150 °C, dissipates 6.5 W at TA = 50 °C on infinite heatsink, and meets UL 497B recognition (QVGQ2) for protector classification. The device is rated for 200 A non-repetitive forward surge current (8.3 ms half-sine) and exhibits 75 °C/W typical junction-to-ambient thermal resistance.
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 mA - Confirmed breakdown range defining turn-on threshold |
| VC @ IPPM | 19.9 V at 75.4 A - Clamped voltage during 1500 W 10/1000 µs surge, limiting stress on downstream ICs |
| PPPM | 1500 W - Peak pulse power handling capability under standardized transient waveform |
| IFSM | 200 A - Surge current rating for 8.3 ms half-sine wave, critical for automotive load-dump immunity |
| TJ max | +150 °C - Maximum junction temperature enabling operation in under-hood or industrial environments |
| Package | DO-214AB (SMCJ) - Standardized surface-mount outline with cathode band marking and 0.320" body length |
Pinout & Package
DO-214AB (SMCJ) package: molded plastic case with J-bend leads, matte tin-plated terminals solderable per J-STD-002/JESD 22-B102, polarity indicated by cathode band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side in unidirectional TVS configuration; carries surge current during forward conduction events |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line; initiates avalanche breakdown when reverse voltage exceeds VBR, shunting surge to ground |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated chip junction | Ensures stable avalanche characteristics and long-term reliability under repeated surge stress |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock |
| MSL Level 1 (260 °C peak) | Enables standard reflow soldering without pre-baking, reducing manufacturing complexity |
| UL 497B recognized (QVGQ2) | Meets safety requirements for telecom and industrial signal-line protectors |
| Low profile DO-214AB footprint | Minimizes PCB area while maintaining high power dissipation via thermal pad layout |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V power rails in engine control units (ECUs) against load-dump transients up to 40 V. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and DC-DC converter input. Use Value: Clamps 19.9 V at 75.4 A, preventing damage to downstream regulators and microcontrollers during ISO 7637-2 Pulse 5a events. | Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC inputs. IC Role / Device Role / Timing Role: TVS mounted directly at connector entry point to suppress induced transients on 4–20 mA or 0–10 V lines. Use Value: Sub-20 V clamping ensures sensor ICs remain within absolute maximum ratings during 1 kV EFT bursts per IEC 61000-4-4. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Stage |
Use Scenario: Shielding Ethernet PHY interfaces and PoE controllers from lightning-induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Paired with common-mode chokes and gas discharge tubes in multi-stage protection architecture. Use Value: Fast <1 ns response and 1500 W rating handle differential-mode surges per ITU-T K.21 basic protection level. | Use Scenario: Guarding AC-DC adapter primary-side rectifier and controller ICs against mains-borne transients. IC Role / Device Role / Timing Role: Placed across bulk capacitor input to clamp switching spikes and surge events. Use Value: 12 V VWM allows reliable blocking during normal 12 V output operation while clamping >13.3 V transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12A-E3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VBR specs | Reduced surge handling; suitable only for lower-energy transients (e.g., ESD-only zones) | Select when board space is constrained and peak surge energy is ≤600 W |
| SMCJ12AHE3/57T | Identical electrical specs but AEC-Q101 qualified version (HE3 suffix); same DO-214AB package | Required for automotive OEM designs requiring full qualification evidence | Choose for automotive applications where AEC-Q101 documentation and traceability are mandatory |
Compared with SMCJ12-E3/57T, SMBJ12A-E3/52T trades surge capacity for compactness, while SMCJ12AHE3/57T adds formal AEC-Q101 compliance without altering performance-making the latter a drop-in upgrade for automotive BOMs needing audit-ready qualification.
Availability
SMCJ12-E3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom line card surge protection, and consumer power adapter input stage applications requiring stable component supply and consistent surge immunity performance.
Supply support for SMCJ12-E3/57T 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 application-specific optimization.
The SMCJ series belongs to Vishay's TRANSZORB® transient voltage suppressor family, engineered for high-power, high-speed clamping in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMCJ12-E3/57T under a 10/1000 µs surge?
The SMCJ12-E3/57T has a maximum clamping voltage (VC) 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 per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ12-E3/57T maintains this clamping performance across its specified operating temperature range.
Is the SMCJ12-E3/57T suitable for automotive applications?
Yes, the SMCJ12-E3/57T is RoHS-compliant and manufactured to meet AEC-Q101 stress test requirements for discrete semiconductors. Its –55 °C to +150 °C operating junction temperature range, 200 A surge rating, and UL 497B recognition make it appropriate for under-hood and chassis-mounted automotive systems. The SMCJ12-E3/57T is widely deployed in ECUs, body control modules, and ADAS power supplies.
What does the "E3/57T" suffix indicate in SMCJ12-E3/57T?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD 201 Class 1A whisker resistance. The "57T" indicates packaging in 7-inch diameter plastic tape and reel, with a base quantity of 850 units per reel. This format supports automated SMT placement and is compatible with standard pick-and-place equipment used in high-volume electronics manufacturing.
How does the SMCJ12-E3/57T differ from bi-directional variants like SMCJ12CA?
The SMCJ12-E3/57T is unidirectional, meaning it conducts only in reverse bias above VBR and blocks forward current beyond its VF (~3.5 V at 100 A). In contrast, SMCJ12CA is bi-directional with symmetrical clamping in both polarities-suitable for AC lines or data buses. The SMCJ12-E3/57T's cathode band marking identifies polarity, whereas bi-directional types have no marking. Electrical parameters like VWM and VC are otherwise comparable.
What PCB layout guidance applies to the SMCJ12-E3/57T for optimal thermal and surge performance?
For optimal performance, mount the SMCJ12-E3/57T on minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Use short, wide traces to minimize inductance between the TVS and protected node. Ensure adequate copper pour connected to both pads for thermal dissipation, especially in high-duty-cycle surge environments. Avoid routing sensitive signals near the TVS body to prevent coupling.
SMCJ12-E3/57T 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ12-E3/57T FAQ
1.How can I place an order for SMCJ12-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12-E3/57T 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 SMCJ12-E3/57T reliable?
The price and inventory of SMCJ12-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ12-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12-E3/57T?
SMCJ12-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12-E3/57T 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 SMCJ12-E3/57T?
For technical support, including SMCJ12-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12-E3/57T requirements.
6.How does Aetrix verify that SMCJ12-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ12-E3/57T 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 SMCJ12-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ12-E3/57T?
All SMCJ12-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12-E3/57T, 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 SMCJ12-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ12-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12-E3/57T Tags
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