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Vishay General Semiconductor - Diodes Division SMCJ12-E3/9AT
- Part No.:
- SMCJ12-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12-E3/9AT.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,389
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Product details
Overview
SMCJ12-E3/9AT 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, and 1500 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ12-E3/9AT datasheet, SMCJ12-E3/9AT pinout, SMCJ12-E3/9AT application, or SMCJ12-E3/9AT equivalent, key selection criteria include clamping voltage margin relative to protected IC's absolute maximum rating, surge current capability under IEC 61000-4-5 Level 4, thermal resistance (RθJA = 75 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The SMCJ12-E3/9AT operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low leakage (<5 µA at 12 V), while the low incremental surge resistance enables tight clamping during fast transients like EFT or load dump.
Designed for surface-mount assembly on 8.0 mm × 8.0 mm copper pads per terminal, it delivers 1500 W peak pulse power dissipation with derating above 25 °C ambient, and supports operating junction temperatures from –55 °C to +150 °C - meeting MSL level 1 per J-STD-020 and AEC-Q101 stress testing requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse working voltage before conduction begins; sets upper limit for normal circuit operation. |
| VBR min/max | 13.3 V / 14.7 V at 1 mA - defines guaranteed avalanche onset range; used to verify margin against system overvoltage thresholds. |
| VC @ IPPM | 19.9 V at 75.4 A - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 1500 W - peak transient power handling capacity; validates compliance with IEC 61000-4-5 surge immunity requirements. |
| RθJA | 75 °C/W - junction-to-ambient thermal resistance; informs PCB copper area and heatsinking needs for sustained surge duty cycles. |
| TJ max | +150 °C - maximum allowable junction temperature; constrains ambient operating range and power derating curves. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band; unidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to lower-potential side (e.g., ground or return); conducts during forward-biased surges or fault conditions. |
| Cathode | Avalanche clamping node | Connected to protected line (e.g., 12 V rail); initiates clamping when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR tolerance (±5%), low leakage (<5 µA), and long-term reliability under thermal cycling. |
| AEC-Q101 qualification | Validated for automotive applications including engine control, body electronics, and ADAS sensor interfaces. |
| MSL Level 1 rating | Enables lead-free reflow without moisture-induced damage; peak reflow temperature up to 260 °C supported. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients (e.g., ISO 7637-2 pulse 1/2a/5a), improving clamping precision. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) against load dump transients per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC-DC converter input. Use Value: Limits transient voltage to ≤19.9 V, preventing damage to downstream 24 V-rated regulators and microcontrollers. | Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Bidirectional-capable protection element (though SMCJ12-E3/9AT is unidirectional, used with series resistor for bidirectional behavior) guarding against ESD and inductive switching noise. Use Value: Clamps fast-rising spikes (<1 ns rise time) to safe levels while maintaining <5 µA leakage at 12 V nominal operation. |
| Telecom Power Supply Input | Consumer Device USB Port Protection |
Use Scenario: Safeguarding primary-side inputs of AC/DC adapters in VoIP phones exposed to lightning-induced surges. IC Role / Device Role / Timing Role: First-line transient suppressor on bulk input rail before bridge rectifier and PFC stage. Use Value: Absorbs 1500 W peak pulses (10/1000 µs) without degradation, enabling compliance with ITU-T K.20 and IEC 61000-4-5 Level 3. | Use Scenario: Adding secondary-level overvoltage protection on VBUS line of USB 2.0 host ports in smart home hubs. IC Role / Device Role / Timing Role: Standby-mode TVS placed after polyfuse and upstream of USB switch IC. Use Value: Responds in <1 ns to ESD events (IEC 61000-4-2 ±15 kV contact), limiting voltage to <20 V and preserving USB PHY 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-E3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W). | Suitable for space-constrained consumer designs with lower surge exposure (e.g., IEC 61000-4-2 only). | Select when board area is critical and peak surge energy does not exceed 400 W. |
| SMCJ12AHE3/9AT | Identical electrical specs but AEC-Q101 qualified (HE3 suffix); same DO-214AB package and marking code GEE. | Required for automotive production where full AEC-Q101 traceability and test records are mandated. | Choose SMCJ12AHE3/9AT if automotive qualification documentation and lot-level test reports are contractually required. |
Compared with SMCJ12-E3/9AT, SMAJ12A-E3/61T offers reduced surge capacity in a smaller footprint, while SMCJ12AHE3/9AT provides identical performance with certified automotive qualification - making the latter mandatory for Tier 1 automotive BOMs and the former viable for cost-sensitive industrial controls.
Availability
SMCJ12-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom power supply input surge suppression requiring stable component supply across high-volume production cycles.
Supply support for SMCJ12-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMCJ series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure applications demanding AEC-Q101 compliance and 1500 W surge capability.
FAQ
What is the clamping voltage of the SMCJ12-E3/9AT under a 10/1000 µs surge?
The SMCJ12-E3/9AT has a maximum clamping voltage (VC) of 19.9 V at 75.4 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuits during standardized surge events - critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMCJ12-E3/9AT maintains this clamping performance across its full operating temperature range.
Is the SMCJ12-E3/9AT AEC-Q101 qualified?
No, the SMCJ12-E3/9AT is RoHS-compliant commercial-grade with E3 suffix and is not AEC-Q101 qualified. For automotive applications requiring AEC-Q101 certification, the functionally identical SMCJ12AHE3/9AT (HE3 suffix) must be selected - it shares the same electrical characteristics, DO-214AB package, and marking code GEE, but includes full AEC-Q101 stress test documentation and lot traceability. The SMCJ12-E3/9AT remains suitable for industrial and telecom use cases where AEC-Q101 is not mandated.
What is the thermal resistance of the SMCJ12-E3/9AT, and how does it affect layout?
The SMCJ12-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. This value directly impacts PCB layout: insufficient copper area increases thermal impedance, causing junction temperature to rise faster during repeated surges and accelerating parametric drift or failure. To maintain reliability, designers must adhere to the recommended pad dimensions and avoid thermal isolation - the SMCJ12-E3/9AT depends on this copper mass for both surge energy dissipation and steady-state thermal management.
How does the SMCJ12-E3/9AT differ from bi-directional variants like SMCJ12CA?
The SMCJ12-E3/9AT is unidirectional, meaning it conducts only in reverse bias above VBR and blocks forward current beyond VF ≈ 3.5 V at 100 A. In contrast, SMCJ12CA is bi-directional with symmetrical clamping in both polarities - useful for AC lines or differential signal pairs. The SMCJ12-E3/9AT uses cathode band marking; SMCJ12CA has no polarity marking. Both share identical VWM (12 V), VBR (13.3–14.7 V), and VC (19.9 V), but only the CA version supports dual-polarity transients without external circuitry. Select SMCJ12-E3/9AT for DC rail protection where polarity is fixed.
What packaging format does the SMCJ12-E3/9AT ship in?
The SMCJ12-E3/9AT ships in 13-inch diameter plastic tape and reel format, with a base quantity of 3500 units per reel (package code 9AT). This format supports high-speed automated pick-and-place assembly and is compatible with standard SMT feeders. The device is RoHS-compliant (E3 suffix), meets JESD 201 Class 1A whisker resistance, and is rated MSL Level 1 - allowing unlimited floor life and peak reflow temperatures up to 260 °C. No dry pack or baking is required prior to assembly.
SMCJ12-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:
- 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-E3/9AT FAQ
1.How can I place an order for SMCJ12-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12-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 SMCJ12-E3/9AT reliable?
The price and inventory of SMCJ12-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 SMCJ12-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ12-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12-E3/9AT?
SMCJ12-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12-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 SMCJ12-E3/9AT?
For technical support, including SMCJ12-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12-E3/9AT requirements.
6.How does Aetrix verify that SMCJ12-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ12-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 SMCJ12-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ12-E3/9AT?
All SMCJ12-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12-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 SMCJ12-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ12-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12-E3/9AT Tags
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