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Vishay General Semiconductor - Diodes Division SMCJ51A-E3/9AT
- Part No.:
- SMCJ51A-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51A-E3/9AT.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,094
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Product details
Overview
SMCJ51A-E3/9AT from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 51 V standoff voltage (VWM), 56.7–62.7 V breakdown range at 1 mA, 82.4 V maximum clamping voltage at 18.2 A peak pulse current, and 1500 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMCJ51A-E3/9AT datasheet, SMCJ51A-E3/9AT pinout, SMCJ51A-E3/9AT application, or SMCJ51A-E3/9AT equivalent, this device is selected for high-energy surge immunity in automotive power modules, industrial sensor interfaces, and telecom DC input stages where fast response (<1 ns), low clamping ratio (1.62× VWM), and AEC-Q101 qualification are critical.
Technical Context
The SMCJ51A-E3/9AT operates as a silicon avalanche diode that enters controlled breakdown above its reverse standoff voltage (51 V), diverting transient energy to ground while limiting voltage across protected circuitry. Its glass-passivated junction ensures stable leakage (<1 µA at VWM) and repeatable clamping performance under repetitive surges.
Thermal design relies on low junction-to-lead resistance (15 °C/W) and standard SMC pad layout (8.0 mm × 8.0 mm copper per terminal); derating begins above 25 °C ambient, with full power capability only at TA ≤ 25 °C and junction temperature limited to 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 51 V - Maximum continuous reverse operating voltage before significant leakage; defines upper limit of normal DC rail operation. |
| VBR (Breakdown Voltage) | 56.7–62.7 V at 1 mA - Confirmed avalanche initiation range; ensures reliable turn-on margin above VWM. |
| VC (Clamping Voltage) | 82.4 V at 18.2 A (10/1000 µs) - Peak voltage seen by protected IC during worst-case surge; determines minimum safe voltage headroom. |
| PPPM (Peak Pulse Power) | 1500 W - Energy-handling capacity for standardized 10/1000 µs transients; validates compliance with IEC 61000-4-5 Level 4. |
| IPPM (Peak Pulse Current) | 18.2 A - Maximum surge current the device safely clamps without degradation; directly tied to PCB trace width and grounding strategy. |
| TJmax | 150 °C - Absolute maximum junction temperature; constrains thermal design when used in enclosed, high-ambient environments. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with cathode band marking; supports automated placement and meets UL 94 V-0. |
Pinout & Package
SMCJ51A-E3/9AT uses the SMC (DO-214AB) package: a rectangular surface-mount case measuring 7.11 mm × 6.22 mm × 2.62 mm, with two coplanar matte tin-plated leads. Polarity is marked by a cathode band on the body; the banded end is the cathode (K), and the opposite end is the anode (A).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient return path | Connected to system ground or low-impedance reference; carries full surge current during clamping event. |
| Anode (unmarked end) | Protected line connection | Connected to the line being protected (e.g., +12 V rail or sensor output); voltage referenced to cathode during conduction. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables protection against severe transients per IEC 61000-4-5, including indirect lightning surges on 12 V/24 V automotive and industrial buses. |
| 82.4 V clamping at 18.2 A | Provides 31.4 V overhead above VWM, allowing safe interface with 60 V-rated MOSFETs or 75 V-input DC-DC converters. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulse 1/2a), improving protection fidelity for sensitive analog front-ends. |
| AEC-Q101 qualified variant available | Confirms reliability for automotive under-hood applications; SMCJ51A-E3/9AT itself is commercial-grade but shares identical die and construction. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without preconditioning; eliminates moisture-related popcorning risk during assembly. |
Applications
| Automotive Power Distribution | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and regulator input to clamp transients up to 120 V. Use Value: Limits voltage to ≤82.4 V during 18.2 A surge, preventing damage to downstream LDOs and microcontrollers rated for 85 V absolute max. | Use Scenario: Shielding 4–20 mA current loop transmitters from ESD and field wiring surges. IC Role / Device Role / Timing Role: Connected anode-to-loop supply, cathode-to-ground; clamps reverse polarity faults and induced spikes. Use Value: With <1 µA leakage at 51 V, it avoids disturbing loop accuracy while suppressing >1 kV ESD events per IEC 61000-4-2. |
| Telecom DC Input Protection | Motor Drive Control Signal Lines |
Use Scenario: Safeguarding PoE-powered equipment inputs against AC/DC adapter transients and hot-swap surges. IC Role / Device Role / Timing Role: Placed on primary-side DC input (e.g., 48 V PSE output) ahead of DC-DC converter. Use Value: 1500 W rating handles 10/1000 µs surges up to 120 V, meeting EN 61000-4-5 requirements for Class A equipment. | Use Scenario: Protecting isolated gate drivers (e.g., SiC MOSFET drivers) from Miller-induced voltage spikes. IC Role / Device Role / Timing Role: Mounted across driver output (HO/LO) and ground to clamp dv/dt-induced overshoot. Use Value: Sub-nanosecond response ensures clamping occurs before driver internal protection fails, preserving switching integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51A-E3/52T | Same VWM/VC specs but lower PPPM (600 W) and smaller SMB package (DO-214AA). | Lower surge energy handling; suitable only for lighter-duty I/O or signal-line protection, not main power rails. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD or low-energy inductive spikes. |
| SMCJ51CA-E3/9AT | Bidirectional version with identical VWM (51 V), VC (82.4 V), and PPPM (1500 W); no polarity marking. | Required for AC-coupled lines or bidirectional data buses (e.g., RS-485) where reverse polarity must also be suppressed. | Choose when protecting symmetric signals or when polarity cannot be guaranteed; same footprint and thermal behavior. |
Compared with SMBJ51A-E3/52T, SMCJ51A-E3/9AT delivers 2.5× higher surge energy tolerance in the same mounting area; versus SMCJ51CA-E3/9AT, it offers optimized unidirectional clamping with lower leakage and tighter VBR tolerance for DC rail use.
Availability
SMCJ51A-E3/9AT is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom DC input protection, and motor drive control signal lines requiring stable component supply, RoHS-compliant sourcing, and consistent tape-and-reel delivery.
Supply support for SMCJ51A-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, MOSFETs, and protection devices with emphasis on reliability, precision, and automotive-grade qualification.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-power transient suppression in harsh environments-targeting automotive, industrial, and telecom infrastructure where failure resilience is non-negotiable.
FAQ
What is the maximum clamping voltage of the SMCJ51A-E3/9AT under standard test conditions?
The SMCJ51A-E3/9AT has a maximum clamping voltage (VC) of 82.4 V when subjected to an 18.2 A peak pulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and reflects the highest voltage the device allows across its terminals during a defined surge event, ensuring downstream components remain within safe operating limits. The SMCJ51A-E3/9AT achieves this clamping performance while maintaining low incremental resistance and fast response.
Is the SMCJ51A-E3/9AT RoHS-compliant and halogen-free?
Yes, the SMCJ51A-E3/9AT carries the "E3" suffix, indicating it is RoHS-compliant and manufactured to commercial-grade specifications per Vishay's material categorization. It is not halogen-free-that designation requires the "M3" suffix (e.g., SMCJ51A-M3/9AT). The E3 variant uses matte tin-plated leads and meets JESD 201 Class 2 whisker resistance, making it suitable for lead-free reflow assembly without compromising solderability or long-term reliability. The SMCJ51A-E3/9AT conforms fully to EU RoHS Directive 2011/65/EU.
Can the SMCJ51A-E3/9AT be used in automotive applications?
The SMCJ51A-E3/9AT is a commercial-grade variant and is not AEC-Q101 qualified; however, it shares identical die, packaging, and electrical characteristics with the AEC-Q101-qualified SMCJ51AHE3_X family. For non-safety-critical automotive subsystems-such as infotainment power rails or body control module peripherals-it is widely deployed with proper derating and thermal validation. For under-hood or safety-related systems, engineers should specify the HE3-suffixed version. The SMCJ51A-E3/9AT remains a cost-optimized option where full qualification is not mandated.
What is the thermal resistance from junction to ambient for the SMCJ51A-E3/9AT?
The typical thermal resistance from junction to ambient (RθJA) for the SMCJ51A-E3/9AT is 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pad per terminal. This value assumes still air and standard FR-4 PCB construction. In practice, actual RθJA will improve with additional copper pour, internal planes, or forced airflow. Because the SMCJ51A-E3/9AT dissipates only 6.5 W continuously, thermal management is rarely limiting-but junction temperature must stay below 150 °C under surge duty cycles, especially at elevated ambient temperatures.
How does the SMCJ51A-E3/9AT differ from the SMCJ51CA-E3/9AT?
The SMCJ51A-E3/9AT is unidirectional, with a cathode band marking and forward conduction capability, while the SMCJ51CA-E3/9AT is bidirectional-functionally two anti-series avalanche diodes in one package, with no polarity marking. Both share identical VWM (51 V), VC (82.4 V), and PPPM (1500 W), but the unidirectional SMCJ51A-E3/9AT exhibits lower reverse leakage (<1 µA at VWM) and tighter VBR tolerance, making it preferred for DC rail protection. The SMCJ51A-E3/9AT is not interchangeable with the CA version without circuit review.
SMCJ51A-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:
- 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-E3/9AT FAQ
1.How can I place an order for SMCJ51A-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51A-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 SMCJ51A-E3/9AT reliable?
The price and inventory of SMCJ51A-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 SMCJ51A-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ51A-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51A-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51A-E3/9AT?
SMCJ51A-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51A-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 SMCJ51A-E3/9AT?
For technical support, including SMCJ51A-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51A-E3/9AT requirements.
6.How does Aetrix verify that SMCJ51A-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ51A-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 SMCJ51A-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ51A-E3/9AT?
All SMCJ51A-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51A-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 SMCJ51A-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ51A-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51A-E3/9AT Tags
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