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Vishay General Semiconductor - Diodes Division SMCJ12A-E3/9AT
- Part No.:
- SMCJ12A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12A-E3/9AT.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,828
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Product details
Overview
SMCJ12A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) 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 - deployed on power rails and signal lines in automotive ECUs and industrial motor drives.
For engineers reviewing the SMCJ12A-E3/9AT datasheet, SMCJ12A-E3/9AT pinout, SMCJ12A-E3/9AT application, or SMCJ12A-E3/9AT equivalent, key selection criteria include unidirectional polarity, 1500 W surge capability, 19.9 V clamping under 75.4 A surge, RoHS-compliant matte tin terminations, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
The SMCJ12A-E3/9AT operates as a clamping-type TVS diode using an avalanche breakdown mechanism to limit transient voltages across protected circuits. Its glass-passivated junction ensures stable leakage performance (<5 µA at VWM) and fast response time (<1 ns), while low incremental surge resistance enables effective energy diversion during ESD or lightning-induced surges.
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W, requiring minimum 8.0 mm × 8.0 mm copper pads per terminal for full 1500 W rating. The cathode band denotes polarity; no marking on bidirectional versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Standoff Voltage) | 12 V - Maximum continuous reverse operating voltage before clamping begins; sets threshold for normal circuit operation. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above nominal rail voltage. |
| VC (Clamping Voltage) | 19.9 V at 75.4 A (10/1000 µs) - Peak voltage seen by protected IC/MOSFET during worst-case surge; defines safe margin for downstream components. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for standardized 10/1000 µs transients; validates suitability for IEC 61000-4-5 Level 4 compliance designs. |
| IPPM (Peak Pulse Current) | 75.4 A - Maximum surge current the device safely clamps without failure; directly tied to PCB pad thermal design. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and high-ambient industrial environments. |
| Leakage (ID) | ≤5 µA at 12 V - Low reverse leakage preserves system efficiency and prevents false triggering in low-power sensor interfaces. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, 2-terminal case with cathode band marking. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or return path; completes clamping loop when transient exceeds VBR. |
| Cathode (banded end) | High-side connection in unidirectional configuration | Connected to protected line (e.g., 12 V rail); blocks forward current but avalanches in reverse during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Enables protection against severe transients including ISO 7637-2 Pulse 5a (load dump) in 12 V automotive systems. |
| 19.9 V clamping at 75.4 A | Keeps protected MOSFET gate-source voltage below absolute maximum ratings during surge events. |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| RoHS-compliant matte tin plating | Ensures solderability per J-STD-002 and whisker resistance per JESD 201 Class 2 for long-term reliability. |
| AEC-Q101 qualification path | HE3/HM3 variants available for automotive applications requiring stress-tested TVS components. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units (ECUs) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between battery rail and DC-DC input stage. Use Value: Limits transient voltage to ≤19.9 V during 75.4 A surges, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors. IC Role / Device Role / Timing Role: Reverse-biased clamping element on signal line referenced to local ground. Use Value: Sub-1 ns response suppresses EFT bursts (IEC 61000-4-4) without distorting low-bandwidth analog signals. |
| Telecom Line Card Surge Protection | Consumer Power Adapter Input Protection |
Use Scenario: Shielding Ethernet PHY power pins and bias rails in telecom base station line cards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on +3.3 V or +5 V auxiliary rails feeding communication ICs. Use Value: 1500 W rating handles multi-kV induced transients while maintaining <5 µA leakage for stable bias conditions. | Use Scenario: Overvoltage suppression on AC-DC adapter primary-side rectified DC bus (e.g., 12 V output stage). IC Role / Device Role / Timing Role: Unidirectional shunt protector placed across bulk capacitor terminals. Use Value: Clamps switching spikes and line surges to ≤19.9 V, extending electrolytic capacitor life and preventing MOSFET avalanche failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC12 | Lower 1000 W PPPM, same 12 V VWM, higher VC = 22.5 V at 50 A | Less robust for high-energy surges like load dump; suitable for cost-sensitive consumer-grade designs. | Select SAC12 only if system-level testing confirms 22.5 V clamping is within protected IC's absolute maximum ratings. |
| 1.5SMC12A | Same SMC package, identical VWM/VBR/VC, but rated at 1500 W with tighter VBR tolerance (±5 % vs. ±10 % for SMCJ series) | Preferred where precise breakdown consistency is required across temperature for predictable clamping onset. | Choose 1.5SMC12A when statistical process control of VBR variation is critical, e.g., in safety-critical subsystems. |
Compared with SAC12 and 1.5SMC12A, the SMCJ12A-E3/9AT offers balanced surge robustness, industry-standard tolerances, and direct AEC-Q101 qualification path - making it optimal for mid-tier automotive and industrial designs requiring verified reliability without premium binning costs.
Availability
SMCJ12A-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and telecom line card surge protection requiring stable component supply, consistent RoHS-compliant manufacturing, and traceable lot-level documentation.
Supply support for SMCJ12A-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, TVS devices, and optoelectronics with emphasis on reliability, power handling, and automotive qualification.
The SMCJ series was developed specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where 1500 W surge immunity and AEC-Q101 readiness are mandatory.
FAQ
What is the clamping voltage of the SMCJ12A-E3/9AT at its rated peak pulse current?
The SMCJ12A-E3/9AT has a maximum clamping voltage (VC) of 19.9 V at 75.4 A peak pulse current with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. Designers must verify that this clamping level remains below the absolute maximum ratings of downstream components such as MOSFETs or regulators in the SMCJ12A-E3/9AT-protected system.
Is the SMCJ12A-E3/9AT suitable for automotive applications?
Yes - the SMCJ12A-E3/9AT is RoHS-compliant and compatible with AEC-Q101 qualification when ordered with HE3 or HM3 suffixes (e.g., SMCJ12AHE3_A/I). While the -E3/9AT variant itself is commercial-grade, its construction - including glass-passivated junction, MSL Level 1 rating, and 150 °C TJ max - meets foundational requirements for under-hood and chassis-mounted automotive modules. Full AEC-Q101 validation requires the designated automotive ordering code.
What does the "E3/9AT" suffix indicate in SMCJ12A-E3/9AT?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting J-STD-002 solderability and JESD 201 Class 2 whisker resistance. The "9AT" indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3500 units. This format supports high-volume automated SMT placement and is distinct from the 7-inch "57T" reel option used for lower-volume or prototyping needs.
How does the SMCJ12A-E3/9AT differ from bidirectional variants like SMCJ12CA?
The SMCJ12A-E3/9AT is unidirectional, featuring a cathode band and blocking forward current while clamping reverse transients - ideal for DC rail protection. In contrast, SMCJ12CA is bidirectional, with symmetrical clamping in both polarities and no polarity marking, suited for AC lines or differential signal pairs. Their VWM, VBR, and VC values differ slightly due to internal structure; SMCJ12A-E3/9AT has VWM = 12 V and VC = 19.9 V, whereas SMCJ12CA has VWM = 12 V but VC = 21.2 V at same IPPM.
What PCB layout guidance applies to the SMCJ12A-E3/9AT to achieve full 1500 W rating?
To sustain the full 1500 W peak pulse power rating, the SMCJ12A-E3/9AT must be mounted on minimum 8.0 mm × 8.0 mm copper pads per terminal, per Vishay's datasheet Fig. 2 derating curve. Smaller pads reduce thermal dissipation, forcing derating of IPPM and PPPM. Trace width, layer count, and internal copper planes also impact thermal performance - designers should simulate or validate with thermal imaging under worst-case surge conditions using the SMCJ12A-E3/9AT.
SMCJ12A-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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ12A-E3/9AT FAQ
1.How can I place an order for SMCJ12A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12A-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 SMCJ12A-E3/9AT reliable?
The price and inventory of SMCJ12A-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 SMCJ12A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ12A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12A-E3/9AT?
SMCJ12A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12A-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 SMCJ12A-E3/9AT?
For technical support, including SMCJ12A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ12A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ12A-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 SMCJ12A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ12A-E3/9AT?
All SMCJ12A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12A-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 SMCJ12A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ12A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12A-E3/9AT Tags
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