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Vishay General Semiconductor - Diodes Division SMCJ51AHE3/57T
- Part No.:
- SMCJ51AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51AHE3/57T.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,818
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Product details
Overview
SMCJ51AHE3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 51 V standoff voltage (VWM), 82.4 V maximum clamping voltage at 18.2 A peak pulse current, and 1500 W peak pulse power rating with a 10/1000 μs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ51AHE3/57T datasheet, SMCJ51AHE3/57T pinout, SMCJ51AHE3/57T application, or SMCJ51AHE3/57T equivalent, key selection criteria include clamping performance under 10/1000 μs surge, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), and SMC (DO-214AB) package compatibility with automated SMT assembly.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its 56.7–62.7 V breakdown range (VBR) at 1 mA test current. Its glass-passivated junction ensures stable leakage (<1 μA at 51 V) and fast response time (<1 ns), enabling suppression of ESD, lightning-induced transients, and inductive switching spikes.
Thermally, it sustains 150 °C maximum junction temperature and delivers 6.5 W steady-state power dissipation on infinite heatsink at 50 °C ambient. The device meets J-STD-020 MSL Level 1 and is qualified to AEC-Q101 for automotive use - confirmed by HE3 suffix and Vishay's ordering code documentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Ensures reliable turn-on margin above VWM with low parametric spread |
| VC @ IPPM | 82.4 V at 18.2 A - Limits downstream voltage stress during 1500 W transient events |
| PPPM | 1500 W - Withstands high-energy surges per 10/1000 μs standard waveform |
| ID @ VWM | <1 μA - Negligible leakage in standby, critical for low-power sensor interfaces |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial environments |
| RθJA | 75 °C/W - Defines thermal derating curve for PCB pad layout design (8.0 mm × 8.0 mm copper) |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Reverse voltage reference | Connected to system ground or lower-potential rail in unidirectional clamp configuration |
| Cathode | Clamping output / Surge current sink | Connected to protected line (e.g., 51 V supply rail); absorbs transient energy into ground path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, ADAS sensors, and infotainment power rails |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity stress |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns |
| UL 94 V-0 molding compound | Meets flammability requirements for enclosed industrial and automotive enclosures |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed microcontroller power inputs against load dump and alternator transients per ISO 16750-2. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and ground, activated within nanoseconds of overvoltage onset. Use Value: Clamps peak voltage to ≤82.4 V, preventing damage to 5 V or 3.3 V LDOs and MCU VDD pins rated for 6 V absolute maximum. | Use Scenario: Safeguarding analog sensor outputs (e.g., 4–20 mA loop transmitters, RTD bridges) from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1 μA) TVS placed across differential signal pair or single-ended output to ground. Use Value: Maintains signal integrity during normal operation while suppressing ±8 kV contact ESD (IEC 61000-4-2) without loading the sensor output. |
| Telecom DC Power Input Protection | PLC Digital I/O Module Protection |
Use Scenario: Guarding -48 V telecom rectifier outputs against lightning-induced surges entering via long feeder cables. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-rail, cathode-to-ground to clamp negative-going transients on negative supply. Use Value: Withstands 1500 W peak pulse energy (10/1000 μs) while limiting clamped voltage to 82.4 V, preserving downstream DC/DC converter input stage. | Use Scenario: Shielding 24 V digital input channels in programmable logic controllers from field-wiring induced transients (IEC 61000-4-4 EFT). IC Role / Device Role / Timing Role: TVS mounted at connector entry point, shunting surge current away from optocoupler input and series current-limiting resistor. Use Value: Fast response (<1 ns) and low clamping voltage prevent false triggering or latch-up in input conditioning circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51AHE3/52T | Lower PPPM (600 W), same VWM/VC, SMB (DO-214AA) package - smaller footprint, lower surge capacity | Suitable for space-constrained consumer electronics where 1500 W surge immunity is not required | Select when board area is limited and peak surge energy is ≤600 W |
| SMCJ51CAHE3/57T | Bidirectional variant; identical VWM, VBR, and VC, but symmetric clamping for AC or floating signal lines | Required for protecting bidirectional data lines (e.g., RS-485, CAN) or AC-coupled analog paths | Choose only when protection must function identically for both polarities |
Compared with SMBJ51AHE3/52T and SMCJ51CAHE3/57T, the SMCJ51AHE3/57T uniquely balances high 1500 W surge capability with AEC-Q101 qualification and SMC package thermal performance - making it optimal for automotive and industrial DC rail protection where reliability under sustained thermal stress is critical.
Availability
SMCJ51AHE3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, telecom power supplies, and sensor interface circuits requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ51AHE3/57T 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 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 repeatable clamping performance.
FAQ
What is the clamping voltage of the SMCJ51AHE3/57T under maximum rated surge current?
The SMCJ51AHE3/57T has a maximum clamping voltage (VC) of 82.4 V at its rated peak pulse current (IPPM) of 18.2 A, measured using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events. The SMCJ51AHE3/57T maintains this clamping performance due to its low incremental surge resistance and stable avalanche characteristics.
Is the SMCJ51AHE3/57T qualified for automotive applications?
Yes, the SMCJ51AHE3/57T is AEC-Q101 qualified, as confirmed by its HE3 suffix and Vishay's official ordering documentation. This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD robustness - validating its suitability for under-hood and cabin-mounted automotive systems such as body control modules, ADAS camera power supplies, and infotainment DC/DC inputs. The SMCJ51AHE3/57T meets all requirements specified in the AEC-Q101 standard for discrete semiconductors.
What is the standoff voltage and breakdown voltage range for the SMCJ51AHE3/57T?
The SMCJ51AHE3/57T has a reverse standoff voltage (VWM) of 51 V and a minimum/maximum breakdown voltage (VBR) range of 56.7 V to 62.7 V at 1 mA test current. This 5.7 V margin between VWM and VBR min ensures reliable non-conduction during normal operation while guaranteeing activation before damaging overvoltage levels occur. The SMCJ51AHE3/57T's tight VBR tolerance supports consistent protection behavior across production lots.
Does the SMCJ51AHE3/57T have a defined thermal resistance specification?
Yes, the SMCJ51AHE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad per terminal. This value is critical for calculating junction temperature rise under steady-state power dissipation (6.5 W at 50 °C ambient) and for derating peak pulse power at elevated ambient temperatures. The SMCJ51AHE3/57T's RθJA enables accurate thermal design in compact industrial and automotive PCB layouts.
How does the SMCJ51AHE3/57T differ from the bidirectional SMCJ51CAHE3/57T?
The SMCJ51AHE3/57T is unidirectional, with polarity marked by a cathode band and intended for DC rail protection where transients occur only in one polarity. In contrast, the SMCJ51CAHE3/57T is bidirectional, offering symmetric clamping for AC signals or floating lines like RS-485 or CAN bus. Both share identical VWM, VBR, VC, and PPPM ratings, but the SMCJ51AHE3/57T cannot replace the CA version in bidirectional applications without risking failure. Their package, qualification, and thermal specs are otherwise identical.
SMCJ51AHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 18.2A
- 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)
SMCJ51AHE3/57T FAQ
1.How can I place an order for SMCJ51AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51AHE3/57T 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 SMCJ51AHE3/57T reliable?
The price and inventory of SMCJ51AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51AHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ51AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51AHE3/57T?
SMCJ51AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51AHE3/57T 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 SMCJ51AHE3/57T?
For technical support, including SMCJ51AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51AHE3/57T requirements.
6.How does Aetrix verify that SMCJ51AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ51AHE3/57T 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 SMCJ51AHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ51AHE3/57T?
All SMCJ51AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51AHE3/57T, 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 SMCJ51AHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ51AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51AHE3/57T Tags
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