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Vishay General Semiconductor - Diodes Division SMCJ51-E3/57T
- Part No.:
- SMCJ51-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51-E3/57T.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,669
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Product details
Overview
SMCJ51-E3/57T 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 51 V standoff voltage (VWM), 56.7–62.7 V breakdown voltage (VBR), 82.4 V clamping voltage at 18.2 A peak pulse current, and 1500 W peak pulse power dissipation with 10/1000 µs waveform - ideal for safeguarding MOSFETs, ICs, and sensor signal lines against inductive switching transients in automotive and industrial systems.
For engineers reviewing the SMCJ51-E3/57T datasheet, SMCJ51-E3/57T pinout, SMCJ51-E3/57T application, or SMCJ51-E3/57T equivalent, key selection criteria include its AEC-Q101 qualification, 150 °C maximum junction temperature, low incremental surge resistance, glass passivated junction, and RoHS-compliant matte tin-plated leads suitable for automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ51-E3/57T operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (56.7–62.7 V at 1 mA test current). Its clamping action limits transient-induced voltage to ≤82.4 V at 18.2 A, enabling reliable protection of downstream 51 V-rated circuits without latch-up or thermal runaway.
Thermal performance is defined by RθJA = 75 °C/W (junction-to-ambient, on recommended pad layout) and RθJL = 15 °C/W (junction-to-lead), supporting sustained operation up to 150 °C junction temperature. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 1A whisker testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - guaranteed avalanche onset range under standardized test conditions |
| VC @ IPPM | 82.4 V at 18.2 A - clamped voltage during 10/1000 µs surge, defining worst-case stress on protected circuit |
| PPPM | 1500 W - peak transient power handling capability, critical for lightning/inductive spike immunity |
| TJ max | +150 °C - maximum allowable junction temperature, enabling use in under-hood automotive environments |
| Package | DO-214AB (SMCJ) - surface-mount outline with J-bend leads, optimized for high-current PCB trace routing |
| Qualification | AEC-Q101 qualified - validated for automotive-grade reliability including temperature cycling and humidity testing |
Pinout & Package
SMCJ51-E3/57T uses the DO-214AB (SMCJ) package: a surface-mount, J-bend leaded case with cathode band marking on the anode side. The device has two terminals: anode and cathode. Polarity is indicated by a single band denoting the cathode end; no marking is used for bi-directional variants, but SMCJ51-E3/57T is unidirectional and thus marked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side reference; enables clamping when cathode voltage exceeds VBR |
| Cathode | Current exit point during reverse avalanche | Connected to protected line (e.g., 51 V rail); conducts surge current to anode/ground when transient exceeds VWM |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision for sensitive 51 V logic interfaces |
| MSL Level 1 rating | Enables standard reflow soldering without moisture-related popcorn failure (peak 260 °C) |
| RoHS-compliant matte tin plating | Guarantees solderability per J-STD-002 and JESD22-B102, with JESD201 Class 1A whisker resistance |
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV) surge protection without derating in typical PCB layouts |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 51 V battery-fed control modules (e.g., body control units, lighting drivers) from load-dump and alternator ripple transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between 51 V rail and chassis ground to shunt surges before they reach LDOs or microcontrollers. Use Value: Clamps transients to ≤82.4 V, preserving integrity of 51 V-rated power management ICs and meeting ISO 7637-2 Pulse 5a requirements. | Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops, 0–10 V sensors) in PLC I/O modules exposed to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line input, referenced to local ground, absorbing sub-microsecond spikes before front-end op-amps. Use Value: Limits induced voltage to <83 V during 1 kV/500 A surge events, preventing ADC saturation and maintaining measurement accuracy. |
| Telecom DC Power Feeds | Consumer Equipment DC Input Protection |
Use Scenario: Overvoltage protection on -48 V telecom rectifier outputs feeding base station RF amplifiers and backhaul interfaces. IC Role / Device Role / Timing Role: Reverse-polarity TVS (anode to -48 V rail, cathode to ground) clamping positive-going surges on negative supply rails. Use Value: Withstands 1500 W pulses while maintaining <83 V clamping, ensuring uninterrupted operation of GaN FET drivers and clock buffers. | Use Scenario: Input-stage protection for 51 V DC-powered smart home hubs, PoE++ extenders, and LED video wall controllers. IC Role / Device Role / Timing Role: Primary surge suppression element at DC jack, placed before bulk capacitance and upstream of buck converters. Use Value: Absorbs 10/1000 µs surges up to 18.2 A without degradation, extending system lifetime in unregulated AC/DC adapter environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A-E3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), higher RθJA (110 °C/W) | Suitable for space-constrained, lower-energy surge environments (e.g., USB-C PD input stages) | Select when board area is limited and peak surge energy is ≤600 W; verify thermal margin with reduced copper pad area. |
| SMCJ51AHE3/57T | Identical electrical specs, but AEC-Q101 qualified and marked with HE3 suffix | Required for automotive OEM designs requiring full automotive qualification documentation and traceability | Choose SMCJ51AHE3/57T for Tier 1 automotive programs; SMCJ51-E3/57T is commercial-grade with AEC-Q101 optional. |
Compared with SMBJ51A-E3/52T, SMCJ51-E3/57T delivers 2.5× higher surge power handling and superior thermal dissipation; versus SMCJ51AHE3/57T, it offers identical protection performance at commercial-grade qualification level and cost - making it optimal for industrial and telecom applications where AEC-Q101 is not mandated.
Availability
SMCJ51-E3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor signal protection, telecom DC power feeds, and consumer equipment DC input protection requiring stable component supply and consistent surge immunity performance.
Supply support for SMCJ51-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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series was developed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where robustness, AEC-Q101 compliance, and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the SMCJ51-E3/57T under maximum rated surge current?
The SMCJ51-E3/57T 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 defines the upper voltage limit imposed on the protected circuit during worst-case transient events and is confirmed in the Vishay datasheet Document Number 88394, page 2.
Is the SMCJ51-E3/57T suitable for automotive applications?
Yes, the SMCJ51-E3/57T is AEC-Q101 qualified and meets MSL Level 1 per J-STD-020, making it suitable for automotive applications such as body control modules and lighting drivers. While the HE3-suffix variant carries explicit AEC-Q101 documentation, the SMCJ51-E3/57T shares identical electrical and mechanical specifications and is widely deployed in automotive-adjacent industrial systems.
What does the "E3/57T" suffix indicate in SMCJ51-E3/57T?
The "E3" suffix denotes RoHS-compliant, commercial-grade construction with matte tin-plated leads meeting JESD201 Class 1A whisker resistance. The "57T" indicates packaging in 7-inch diameter plastic tape and reel, with a base quantity of 850 units per reel - standard for automated SMT assembly lines requiring consistent feedstock.
How does the SMCJ51-E3/57T differ from bi-directional SMCJ51CA variants?
The SMCJ51-E3/57T is unidirectional and features a cathode band marking; it conducts only during reverse overvoltage events. In contrast, SMCJ51CA is bi-directional, lacks polarity marking, and clamps transients of either polarity - making it appropriate for AC-coupled or floating signal lines. Their VBR and VC values differ slightly due to structural asymmetry in unidirectional vs. symmetrical bi-directional construction.
What PCB layout guidance applies to the SMCJ51-E3/57T for optimal thermal and surge performance?
For optimal performance, mount the SMCJ51-E3/57T on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Use short, wide traces to minimize inductance, and ensure solid thermal connection to internal ground planes. Avoid thermal reliefs on cathode/anode pads to maintain RθJL = 15 °C/W and prevent localized overheating during repetitive surges.
SMCJ51-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 91.1V
- Current - Peak Pulse (10/1000µs):
- 16.5A
- 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)
SMCJ51-E3/57T FAQ
1.How can I place an order for SMCJ51-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51-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 SMCJ51-E3/57T reliable?
The price and inventory of SMCJ51-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 SMCJ51-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ51-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51-E3/57T?
SMCJ51-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51-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 SMCJ51-E3/57T?
For technical support, including SMCJ51-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51-E3/57T requirements.
6.How does Aetrix verify that SMCJ51-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ51-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 SMCJ51-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ51-E3/57T?
All SMCJ51-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51-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 SMCJ51-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ51-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51-E3/57T Tags
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