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Vishay General Semiconductor - Diodes Division SMCJ51A-E3/57T
- Part No.:
- SMCJ51A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51A-E3/57T.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,291
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Product details
Overview
SMCJ51A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 µs), 82.4 V maximum clamping voltage (VC) at 18.2 A IPPM, and operates from –55 °C to +150 °C junction temperature - deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMCJ51A-E3/57T datasheet, SMCJ51A-E3/57T pinout, SMCJ51A-E3/57T application, or SMCJ51A-E3/57T equivalent, key selection criteria include unidirectional polarity, 1500 W surge capability, 82.4 V clamping performance at rated current, RoHS-compliant matte tin plating, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode uses an avalanche breakdown mechanism to provide fast transient suppression with sub-nanosecond response time and low incremental surge resistance. Its glass-passivated junction ensures stable VBR tolerance (±5%) and robust reliability under repetitive surge stress.
The device is rated for 1500 W peak pulse power per 10/1000 µs waveform, derated linearly above 25 °C ambient, and exhibits 0.104 %/°C temperature coefficient of VBR - enabling predictable clamping behavior across automotive and industrial thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - Maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - Avalanche conduction initiates within this range; ensures reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 82.4 V at 18.2 A IPPM - Maximum voltage seen by protected circuit during 1500 W transient; critical for IC-level voltage margining. |
| PPPM (Peak Pulse Power) | 1500 W (10/1000 µs) - Surge energy handling capacity; validates suitability for IEC 61000-4-5 Level 4 (4 kV) line surges. |
| ID (Reverse Leakage) | 1.0 µA at 51 V - Minimal standby current draw; preserves low-power system integrity without loading source. |
| TJ Range | –55 °C to +150 °C - Supports under-hood automotive and industrial control cabinet deployments without derating loss. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 8.0 mm × 8.0 mm copper pad thermal footprint for PCB-level heat dissipation. |
Pinout & Package
SMCJ51A-E3/57T is housed in the SMC (DO-214AB) package: a molded, low-profile surface-mount case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity is marked by a cathode band; the device is unidirectional.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when V > VBR - must be routed with low-inductance path to reference plane. |
| Anode | Reference node | Typically tied to system ground or low-impedance return; completes clamping path - requires solid thermal connection to ≥8 mm² copper pour. |
Key Features
| Feature | Design Value |
|---|---|
| Avalanche clamping action | Enables precise, repeatable voltage limiting at 56.7–62.7 V without degradation over 1000+ surges. |
| 1500 W peak pulse rating | Supports high-energy transients per IEC 61000-4-5; eliminates need for cascaded protection stages in 24 V/48 V systems. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes overvoltage stress on downstream MOSFETs or MCU I/O pins - critical for 3.3 V/5 V logic interfacing. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow compatibility up to 260 °C peak - simplifies SMT manufacturing without baking. |
| RoHS-compliant E3 suffix | Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance - qualified for commercial and industrial BOMs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: 12 V battery line in engine control units exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input stage. Use Value: Clamps transients to ≤82.4 V, preventing damage to 100 V-rated input MOSFETs and maintaining regulator functionality. |
Use Scenario: 4–20 mA current loop interface in PLC analog input modules subject to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: TVS mounted directly at connector entry point, shunting surge to chassis ground. Use Value: Limits induced voltage to <85 V during 1 kV EFT bursts, preserving 24 V-rated op-amp front-end integrity. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: –48 V telecom rectifier output feeding backplane distribution, vulnerable to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional variant not used; unidirectional SMCJ51A-E3/57T applied with cathode to –48 V rail, anode to ground. Use Value: Withstands 1500 W pulses while holding rail voltage within ±10 % of nominal during 10/1000 µs events. |
Use Scenario: Brushed DC motor driver H-bridge supply line in smart home appliances, where commutation spikes exceed 100 V. IC Role / Device Role / Timing Role: TVS placed across motor terminals, referenced to local power ground. Use Value: Absorbs 18.2 A surge current at 82.4 V clamping, protecting 60 V MOSFETs from avalanche failure during stall conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ51A-E3/61 | Lower PPPM (400 W), SMA package (smaller thermal mass), same VWM/VBR/VC specs. | Limited to lower-energy transients (IEC 61000-4-2 contact discharge only); unsuitable for load dump or lightning. | Select when board space is constrained and surge threat level is ≤400 W - verify thermal relief on 1 oz. copper. |
| SMCJ51CA-E3/57T | Bidirectional version; identical VWM/VBR/VC but symmetrical clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal occurs. | Choose only if bidirectional protection is mandated; adds no benefit for DC power rails with defined polarity. |
Compared with SMAJ51A-E3/61, SMCJ51A-E3/57T delivers 275 % higher surge power handling and superior thermal stability via larger SMC package; versus SMCJ51CA-E3/57T, it offers optimized cost and layout simplicity for unidirectional DC applications without sacrificing clamping performance.
Availability
SMCJ51A-E3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface design, and telecom DC input conditioning requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMCJ51A-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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and thermal robustness are non-negotiable.
FAQ
What is the maximum clamping voltage of SMCJ51A-E3/57T at its rated peak pulse current?
The SMCJ51A-E3/57T has a maximum clamping voltage (VC) of 82.4 V at its rated peak pulse current (IPPM) of 18.2 A, measured under the standard 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ51A-E3/57T maintains this clamping performance due to its low incremental surge resistance and stable avalanche characteristics.
Is SMCJ51A-E3/57T suitable for automotive applications requiring AEC-Q101 qualification?
The base SMCJ51A-E3/57T is RoHS-compliant and commercial-grade; however, Vishay offers AEC-Q101 qualified versions under the HE3 suffix (e.g., SMCJ51AHE3_A/H). These variants undergo extended stress testing including temperature cycling, humidity bias, and high-temperature operating life - confirming suitability for under-hood and powertrain applications. The SMCJ51A-E3/57T itself is not AEC-Q101 certified, but serves as the foundational design for qualified derivatives.
How does the SMCJ51A-E3/57T differ from bidirectional SMCJ51CA-E3/57T in circuit implementation?
The SMCJ51A-E3/57T is unidirectional and must be oriented with its cathode band toward the positive side of the protected line - conducting only during positive transients relative to ground. In contrast, the SMCJ51CA-E3/57T provides symmetrical clamping in both directions and carries no polarity marking. For DC power rails like 12 V or 48 V systems, the SMCJ51A-E3/57T offers lower cost and simpler layout; the SMCJ51CA-E3/57T is required only for AC or floating nodes such as differential data lines.
What is the thermal resistance junction-to-ambient for SMCJ51A-E3/57T, and how does it affect PCB layout?
The SMCJ51A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. To maintain safe operation under repeated surges, PCB layout must allocate ≥64 mm² of 2 oz. copper per pad, avoid thermal isolation, and minimize trace length between device terminals and ground/power planes. Exceeding TJ max. of 150 °C risks parametric shift and reduced surge endurance.
Can SMCJ51A-E3/57T be used in parallel to increase surge current handling?
No - SMCJ51A-E3/57T devices should not be paralleled without external balancing components. Minor VBR mismatches between units cause current hogging, leading to premature failure of the lowest-VBR device. For higher IPPM requirements, select a single higher-rated part (e.g., SMCJ64A-E3/57T) or implement staged protection with upstream current-limiting impedance. The SMCJ51A-E3/57T is characterized and specified as a standalone device; parallel operation voids performance guarantees.
SMCJ51A-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:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ51A-E3/57T FAQ
1.How can I place an order for SMCJ51A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51A-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 SMCJ51A-E3/57T reliable?
The price and inventory of SMCJ51A-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 SMCJ51A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ51A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51A-E3/57T?
SMCJ51A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51A-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 SMCJ51A-E3/57T?
For technical support, including SMCJ51A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51A-E3/57T requirements.
6.How does Aetrix verify that SMCJ51A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ51A-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 SMCJ51A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ51A-E3/57T?
All SMCJ51A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51A-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 SMCJ51A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ51A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51A-E3/57T Tags
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