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Vishay General Semiconductor - Diodes Division SMCJ12HE3/57T
- Part No.:
- SMCJ12HE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ12HE3/57T.pdf
- Description:
- TVS DIODE 12VWM 22VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,987
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Product details
Overview
SMCJ12HE3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of DC power rails and signal lines. 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. It is AEC-Q101 qualified and RoHS compliant, targeting automotive electronics protection.
For engineers reviewing the SMCJ12HE3/57T datasheet, SMCJ12HE3/57T pinout, SMCJ12HE3/57T application, or SMCJ12HE3/57T equivalent, key selection criteria include clamping performance under 10/1000 µs surge, junction temperature derating above 25 °C, unidirectional polarity marking, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ12HE3/57T operates as a silicon avalanche diode, leveraging glass-passivated junction technology to achieve sub-nanosecond response time and low incremental surge resistance. Its unidirectional configuration enables integration into DC-biased circuits where reverse conduction must be blocked - such as 12 V automotive supply rails feeding ECUs or ADAS sensors.
Thermal performance is defined by RθJA = 75 °C/W (on recommended pad layout) and RθJL = 15 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 2 whisker testing due to its HE3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 12 V - Maximum continuous reverse voltage before significant leakage; sets operating margin for 12 V nominal systems. |
| VBR (Breakdown Voltage) | 13.3–14.7 V at 1 mA - Confirmed avalanche onset range; ensures reliable triggering above system transients but below IC absolute max ratings. |
| VC (Clamping Voltage) | 19.9 V at IPPM = 75.4 A - Peak voltage seen by protected circuit during 10/1000 µs surge; critical for downstream component survival. |
| PPPM (Peak Pulse Power) | 1500 W - Sustained energy absorption capability under standardized lightning/surge waveform; defines single-event ruggedness. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive environments with proper PCB thermal design. |
| Package | DO-214AB (SMCJ) - Surface-mount, low-profile case with matte tin-plated leads; compatible with reflow soldering and J-STD-002/JESD 22-B102 standards. |
| AEC-Q101 Qualified | Yes - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD; required for engine control, body electronics, and infotainment modules. |
Pinout & Package
SMCJ12HE3/57T uses the DO-214AB (SMCJ) package: molded plastic case with J-bend leads, 0.320" (8.13 mm) overall length, 0.220–0.246" (5.59–6.22 mm) width, and cathode band marking on one end. Leads are matte tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (non-banded end) | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge events only in uni-directional mode. |
| Cathode | Reverse-blocking / clamping terminal (banded end) | Connected to protected line (e.g., 12 V rail); avalanche clamps to VC when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including temperature cycling, high-temp reverse bias, and mechanical shock - supports Tier-1 ECU designs. |
| Glass-passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift; critical for long-term field reliability. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a/5a); improves clamping fidelity. |
| MSL Level 1 rating | Allows unlimited floor life and standard reflow profiles up to 260 °C peak - simplifies manufacturing without baking requirements. |
| JESD 201 Class 2 whisker resistance | Prevents tin whisker growth under thermal stress and humidity - eliminates latent short-circuit risk in sealed automotive enclosures. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs of engine control units (ECUs) against load dump and alternator ripple per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional TVS diode placed between battery rail and input filter capacitor; clamps surges >20 V while blocking reverse current. Use Value: Limits peak voltage to 19.9 V during 75.4 A 10/1000 µs surge, preventing damage to downstream LDOs and microcontrollers rated for 24 V absolute max. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) in factory automation PLC I/O modules exposed to relay coil switching noise. IC Role / Device Role / Timing Role: Point-of-entry protection on 0–10 V or 4–20 mA signal lines; absorbs inductive kickback before reaching ADC front-end. Use Value: Clamps transients within <1 ns, maintaining signal integrity and avoiding ADC saturation or latch-up in precision measurement circuits. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Securing 12 V/24 V DC inputs of telecom base station remote radio units (RRUs) subjected to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of DC-DC converters; handles bulk energy dissipation before secondary TVS or MOV stages. Use Value: Absorbs 1500 W peak pulse energy without degradation, enabling compliance with IEC 61000-4-5 Level 4 (4 kV line-earth) test requirements. |
Use Scenario: Overvoltage protection on VBUS line of USB-C ports in portable medical monitors and handheld test equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between USB connector and power switch IC; blocks >12 V faults while passing normal 5 V operation. Use Value: Maintains <1 µA leakage at 12 V, preserving battery life; clamps to 19.9 V before USB PD controller ICs exceed their 20 V absolute maximum rating. |
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-E3/52T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W), same VWM/VBR/VC specs. | Suitable for space-constrained consumer boards with lower surge exposure; not AEC-Q101 qualified. | Select when cost and board area are prioritized over automotive-grade ruggedness and 1500 W surge handling. |
| 1.5KE12A | Through-hole TO-218 package, same electrical specs but higher thermal mass; no AEC-Q101 or MSL Level 1 rating. | Used in legacy industrial power supplies where manual assembly or wave soldering remains standard. | Choose only for retrofit or non-automated production; lacks SMT compatibility and modern reliability certifications. |
Compared with SMCJ12HE3/57T, SMAJ12A-E3/52T offers reduced surge capacity and no automotive qualification, while 1.5KE12A sacrifices surface-mountability and modern process controls - making SMCJ12HE3/57T the optimal choice for new automotive and high-reliability SMT designs requiring 1500 W clamping and AEC-Q101 validation.
Availability
SMCJ12HE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, telecom power inputs, and consumer USB port protection requiring stable component supply across multi-year production cycles.
Supply support for SMCJ12HE3/57T 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, efficiency, and application-specific optimization.
The SMCJ series targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom applications where failure modes must be mitigated via certified ruggedness and repeatable clamping performance.
FAQ
What is the clamping voltage of the SMCJ12HE3/57T under a 10/1000 µs surge?
The SMCJ12HE3/57T has a maximum clamping voltage (VC) of 19.9 V at a peak pulse current (IPPM) of 75.4 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and reflects the actual voltage imposed on the protected circuit during standardized surge events - a critical parameter for ensuring downstream ICs remain within their absolute maximum ratings.
Is the SMCJ12HE3/57T suitable for automotive applications?
Yes, the SMCJ12HE3/57T is AEC-Q101 qualified and specifically designed for automotive use. Its HE3 suffix denotes AEC-Q101 qualification, JESD 201 Class 2 whisker resistance, and MSL Level 1 moisture sensitivity - all verified per automotive reliability standards. It is routinely deployed in engine control units, body control modules, and ADAS sensor power rails.
How does the SMCJ12HE3/57T differ from the SMCJ12A-E3/57T?
The SMCJ12HE3/57T is AEC-Q101 qualified and meets JESD 201 Class 2 whisker testing, whereas the SMCJ12A-E3/57T is commercial-grade (E3 suffix only, no 'H'). Both share identical electrical specs (VWM = 12 V, VC = 19.9 V, PPPM = 1500 W) and DO-214AB packaging, but only SMCJ12HE3/57T is approved for automotive production.
What is the thermal resistance of the SMCJ12HE3/57T?
The SMCJ12HE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. Its junction-to-lead resistance (RθJL) is 15 °C/W - values essential for calculating safe power derating above 25 °C ambient.
Does the SMCJ12HE3/57T have polarity marking, and how is it oriented?
Yes, the SMCJ12HE3/57T is unidirectional and features a visible cathode band on the DO-214AB package. The banded end is the cathode and must be connected to the line being protected (e.g., 12 V rail), while the non-banded end (anode) connects to ground or return. This orientation ensures proper reverse-biased clamping behavior.
SMCJ12HE3/57T 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ12HE3/57T FAQ
1.How can I place an order for SMCJ12HE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ12HE3/57T 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 SMCJ12HE3/57T reliable?
The price and inventory of SMCJ12HE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ12HE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ12HE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ12HE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ12HE3/57T?
SMCJ12HE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ12HE3/57T 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 SMCJ12HE3/57T?
For technical support, including SMCJ12HE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ12HE3/57T requirements.
6.How does Aetrix verify that SMCJ12HE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ12HE3/57T 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 SMCJ12HE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ12HE3/57T?
All SMCJ12HE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ12HE3/57T, 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 SMCJ12HE3/57T part is unused and in its original packaging.
Return procedure for SMCJ12HE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ12HE3/57T Tags
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