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Vishay General Semiconductor - Diodes Division SMCJ51-E3/9AT
- Part No.:
- SMCJ51-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51-E3/9AT.pdf
- Description:
- TVS DIODE 51VWM 91.1VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,570
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Product details
Overview
SMCJ51-E3/9AT 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 range (VBR at 1 mA), 82.4 V maximum clamping voltage (VC) at 18.2 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 SMCJ51-E3/9AT datasheet, SMCJ51-E3/9AT pinout, SMCJ51-E3/9AT application, or SMCJ51-E3/9AT equivalent, this device is selected for high-energy surge immunity in 12 V/24 V systems where low clamping ratio, AEC-Q101 qualification, and RoHS-compliant matte tin terminations are required.
Technical Context
The SMCJ51-E3/9AT operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transients. Its unidirectional polarity enables integration into DC-biased circuits without reverse conduction path concerns, and its thermal resistance (RθJA = 75 °C/W) assumes mounting on 8.0 mm × 8.0 mm copper pads per terminal.
It meets MSL Level 1 per J-STD-020 (260 °C peak reflow), supports 200 A non-repetitive forward surge (8.3 ms half-sine), and exhibits ≤1.0 µA reverse leakage at VWM, enabling stable operation in low-power sensor interfaces and CAN bus front-end protection stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin in 48 V nominal systems. |
| VBR (min/max) | 56.7 V / 62.7 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to <83 V under full-rated transient. |
| PPPM | 1500 W - Peak pulse power handling capability; sustains ISO 7637-2 Pulse 1/2/5a surges in automotive environments. |
| IFSM | 200 A - Non-repetitive forward surge rating (8.3 ms); supports inrush and load-dump event tolerance in power supply inputs. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive locations with minimal derating. |
| Leakage @ VWM | ≤1.0 µA - Ultra-low reverse leakage; preserves battery life in always-on vehicle modules and low-power IoT nodes. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Polarity indicated by cathode band on one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry point | Connected to system ground or lower-potential rail; forms clamping path when cathode is at higher potential. |
| Cathode | Avalanche clamping node | Connected to protected line (e.g., 12 V supply or CAN_H); conducts surge current to anode during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control, ADAS, and body electronics. |
| Glass-passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives; critical for high-humidity under-hood deployment. |
| MSL Level 1 rating | Enables single-reflow assembly without baking; compatible with standard SMT lines using 260 °C peak profile. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 16750-2 load dump), improving clamping precision. |
| RoHS-compliant & whisker-tested | E3 suffix meets JESD 201 Class 1A whisker test; eliminates tin whisker risk in high-reliability 15+ year automotive applications. |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed microcontroller power inputs in engine control units against ISO 7637-2 Pulse 5a (load dump). IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND, clamping transients within 1 ns to limit voltage to ≤82.4 V. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V LDOs and MCU cores during 120 V/500 ms load dump events. |
Use Scenario: Shielding CAN_H and CAN_L lines in vehicle infotainment gateways from ESD and coupled transients. IC Role / Device Role / Timing Role: One SMCJ51-E3/9AT per line (cathode to CAN_H, anode to GND) providing bidirectional clamping via external circuit configuration. Use Value: Maintains CAN signal integrity below ±40 V common-mode swing while meeting ISO 10605 ESD immunity up to ±25 kV contact discharge. |
| Industrial Sensor Interface Protection | DC-DC Converter Input Stage |
|
Use Scenario: Safeguarding analog front-ends of pressure/temperature sensors connected to 24 V PLC I/O modules. IC Role / Device Role / Timing Role: Placed upstream of input filtering, absorbing inductive kickback from solenoid drivers sharing same 24 V rail. Use Value: Limits sensor supply rail excursions to <83 V during 1 A/100 µs transients, preserving ADC reference stability and preventing reset faults. |
Use Scenario: Front-end surge suppression for 48 V input buck converters in telecom rectifiers and server PSUs. IC Role / Device Role / Timing Role: Mounted directly at converter input terminals to clamp ISO 16750-2 Pulse 1 (inductive switch-off) transients. Use Value: Enables use of lower-voltage-rated MOSFETs and capacitors downstream by capping input voltage to 82.4 V during 1500 W surges. |
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), same VWM/VC specs. | Limited to lower-energy transients (e.g., IEC 61000-4-5 Level 3); unsuitable for automotive load dump. | Select when board space is constrained and surge energy does not exceed 600 W. |
| SMCJ51AHE3/9AT | Identical electrical specs but AEC-Q101 qualified variant (HE3 suffix); same DO-214AB package and E3 termination. | No functional difference; HE3 denotes automotive-qualified lot traceability and extended test coverage. | Choose for OEM automotive programs requiring full AEC-Q101 documentation and PPAP support. |
Compared with SMBJ51A-E3/52T, the SMCJ51-E3/9AT delivers 2.5× higher surge power handling and superior thermal dissipation; versus SMCJ51AHE3/9AT, it shares identical performance but lacks formal AEC-Q101 certification documentation - making it appropriate for industrial and commercial designs where qualification overhead is unnecessary.
Availability
SMCJ51-E3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input stage surge suppression requiring stable component supply and full tape-and-reel logistics support.
Supply support for SMCJ51-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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial automation, and telecommunications infrastructure.
FAQ
What is the clamping voltage of SMCJ51-E3/9AT at its rated peak pulse current?
The SMCJ51-E3/9AT has a maximum clamping voltage (VC) of 82.4 V at 18.2 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and verified across production lots - ensuring consistent overvoltage limiting behavior in SMCJ51-E3/9AT-based protection circuits.
Is SMCJ51-E3/9AT suitable for automotive applications?
Yes, the SMCJ51-E3/9AT is RoHS-compliant and manufactured to Vishay's commercial-grade specifications with E3 termination. While it shares the same DO-214AB package and electrical characteristics as AEC-Q101-qualified variants like SMCJ51AHE3/9AT, the SMCJ51-E3/9AT itself is not certified to AEC-Q101 - so it is recommended for non-safety-critical automotive subsystems or industrial applications where full qualification is not mandated.
What does the "E3/9AT" suffix indicate in SMCJ51-E3/9AT?
The "E3" suffix denotes RoHS-compliant matte tin plating and JESD 201 Class 1A whisker resistance; "9AT" specifies packaging in 13-inch diameter plastic tape and reel with 3500 units per reel. This format ensures compatibility with high-speed pick-and-place equipment and supports automated manufacturing of SMCJ51-E3/9AT into PCB assemblies.
How does SMCJ51-E3/9AT compare to bi-directional TVS diodes like SMCJ51CA?
The SMCJ51-E3/9AT is unidirectional and intended for DC-biased lines where reverse conduction must be blocked; SMCJ51CA is bi-directional with symmetrical clamping in both polarities. For AC-coupled or floating signal lines (e.g., RS-485), SMCJ51CA is preferred - but for 12 V/24 V power rails, the SMCJ51-E3/9AT provides tighter leakage control (<1 µA) and avoids unnecessary reverse conduction paths that could compromise SMCJ51-E3/9AT system grounding schemes.
What is the thermal resistance of SMCJ51-E3/9AT and how does it affect layout?
The SMCJ51-E3/9AT has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31″ × 0.31″ (8.0 mm × 8.0 mm) copper pads per terminal. To maintain safe junction temperatures during repeated surges, PCB layout must allocate adequate copper area - reducing RθJA improves power dissipation margin and extends SMCJ51-E3/9AT service life under cyclic stress.
SMCJ51-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:
- 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-E3/9AT FAQ
1.How can I place an order for SMCJ51-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51-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 SMCJ51-E3/9AT reliable?
The price and inventory of SMCJ51-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 SMCJ51-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ51-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51-E3/9AT?
SMCJ51-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51-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 SMCJ51-E3/9AT?
For technical support, including SMCJ51-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51-E3/9AT requirements.
6.How does Aetrix verify that SMCJ51-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ51-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 SMCJ51-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ51-E3/9AT?
All SMCJ51-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51-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 SMCJ51-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ51-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51-E3/9AT Tags
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