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Vishay General Semiconductor - Diodes Division SMCJ51CA-M3/57T
- Part No.:
- SMCJ51CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CA-M3/57T.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ51CA-M3/57T from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of sensitive electronics. It features a 51 V standoff voltage (VWM), 82.4 V maximum clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power (10/1000 µs waveform), commonly deployed on power rails and signal lines in automotive ECUs and industrial I/O modules.
For engineers reviewing the SMCJ51CA-M3/57T datasheet, SMCJ51CA-M3/57T pinout, SMCJ51CA-M3/57T application, or SMCJ51CA-M3/57T equivalent, key selection criteria include bidirectional clamping capability, halogen-free RoHS-compliant construction (M3 suffix), AEC-Q101 qualification eligibility, and thermal resistance (RθJA = 75 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamped crowbar during transients: when reverse voltage exceeds its breakdown range (56.7–62.7 V at 1 mA), it avalanches to limit downstream voltage to ≤82.4 V. Its bidirectional symmetry ensures identical clamping in both polarities-critical for AC-coupled or floating signal paths.
Engineered for high-energy surge immunity, the SMCJ51CA-M3/57T sustains 1500 W peak pulse power with low incremental surge resistance and fast response time (<1 ns), while maintaining <1.0 µA leakage at 51 V and operating across –55 °C to +150 °C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working margin below breakdown. |
| VBR min/max | 56.7 V / 62.7 V at 1 mA - Verified avalanche onset range; ensures consistent turn-on across production lots and temperature. |
| VC @ IPPM | 82.4 V at 18.2 A - Clamped voltage during 10/1000 µs surge; directly limits stress on protected ICs or MOSFETs. |
| PPPM | 1500 W - Peak pulse power handling capacity; enables protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω). |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8.0 mm × 8.0 mm copper pads; informs derating above 25 °C ambient. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; compatible with automated pick-and-place. |
Pinout & Package
SMCJ51CA-M3/57T uses the SMC (DO-214AB) package: a two-terminal surface-mount device with no polarity marking for bidirectional operation. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, and meet JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during positive half-cycle clamping | Enables symmetrical conduction in either direction; no cathode band marking distinguishes it from unidirectional variants. |
| Cathode | Current entry point during negative half-cycle clamping | Functionally identical to Anode in bidirectional configuration; terminals are electrically interchangeable for AC or differential line protection. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR, VC, and IPPM performance in both polarities-eliminates need for polarity-aware layout in AC or floating interfaces. |
| Halogen-free & RoHS-compliant (M3) | Meets global environmental compliance requirements without compromising surge robustness or thermal performance. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 7637-2 pulses), improving protection margin for 3.3 V/5 V logic. |
| AEC-Q101 qualification path | Base P/NHM3_X variant available with full automotive qualification-enables drop-in qualification upgrade for SMCJ51CA-M3/57T designs. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life at ≤30 °C/60% RH; eliminates bake requirements prior to reflow, reducing manufacturing overhead. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between VBAT and GND, responding within <1 ns to transients exceeding 51 V. Use Value: Limits peak rail voltage to ≤82.4 V during 100 ms load dump events, preventing latch-up or gate oxide damage in downstream ICs. |
Use Scenario: Shielding analog outputs (e.g., 4–20 mA current loops) and digital sensor interfaces (I²C, SPI) from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS shunting transient energy away from precision ADC inputs or level-shifting buffers. Use Value: Maintains signal integrity by clamping ±15 kV HBM ESD strikes to <85 V while adding <10 pF parasitic capacitance at 0 V bias. |
| Telecom Line Interface Protection | Consumer Power Adapter Output Protection |
Use Scenario: Safeguarding Ethernet PHYs and PoE controllers from lightning-induced surges on RJ45 ports and DC bias lines. IC Role / Device Role / Timing Role: Primary surge suppression stage upstream of common-mode chokes and secondary TVS arrays. Use Value: Absorbs up to 1500 W of coupled surge energy (IEC 61000-4-5) without degradation, preserving PHY link stability. |
Use Scenario: Preventing overvoltage damage to USB-C PD controllers and GaN FET drivers during adapter plug/unplug or output short-circuit recovery. IC Role / Device Role / Timing Role: Secondary-side clamping device on regulated 5–20 V output rails, triggered only during fault conditions. Use Value: Ensures <1 µA leakage at nominal output voltage, avoiding standby power loss while delivering 82.4 V clamping during 10/1000 µs faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51CA | Same VWM (51 V) and bidirectional structure, but lower PPPM (500 W) and smaller SMA package (DO-214AC). | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD); unsuitable for IEC 61000-4-5 surge or load dump. | Select SAC51CA only for space-constrained consumer applications where 1500 W rating is unnecessary. |
| SMCJ51A-M3/57T | Unidirectional variant with identical VWM, VC, and PPPM, but marked cathode band and asymmetric forward conduction. | Requires polarity-aware placement; suitable only for DC-biased rails where reverse conduction must be blocked. | Choose SMCJ51A-M3/57T when protecting single-polarity supplies with strict reverse-leakage requirements. |
Compared with SAC51CA and SMCJ51A-M3/57T, the SMCJ51CA-M3/57T uniquely delivers 1500 W bidirectional surge handling in an industry-standard SMC footprint-making it the only option among the three for automotive-grade AC-coupled or floating-line protection without layout redesign.
Availability
SMCJ51CA-M3/57T is available at Aetrix Electronics and suitable for automotive ECU design, industrial I/O module development, and telecom infrastructure projects requiring stable component supply, halogen-free compliance, and long-term lifecycle support.
Supply support for SMCJ51CA-M3/57T 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMCJ series was developed specifically for high-power transient suppression in harsh environments-emphasizing robust clamping, AEC-Q101 readiness, and compatibility with automated manufacturing processes.
FAQ
What is the clamping voltage of SMCJ51CA-M3/57T at its rated peak pulse current?
The SMCJ51CA-M3/57T has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current of 18.2 A using the standardized 10/1000 µs waveform. This value is measured under specified test conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and represents the upper bound of voltage seen by protected circuitry during worst-case surge events. The SMCJ51CA-M3/57T maintains this clamping performance symmetrically in both directions due to its bidirectional construction.
Is SMCJ51CA-M3/57T qualified to AEC-Q101?
The SMCJ51CA-M3/57T itself is not AEC-Q101 qualified; however, Vishay offers the HM3-suffixed automotive-grade variant (e.g., SMCJ51CAHM3_A/H) which carries full AEC-Q101 qualification. The M3 suffix indicates halogen-free and RoHS-compliant construction but does not imply automotive qualification. Engineers designing for automotive applications should specify the HM3 version explicitly-SMCJ51CA-M3/57T remains suitable for industrial and commercial use where AEC-Q101 is not mandated.
How does the bidirectional nature of SMCJ51CA-M3/57T affect PCB layout?
The SMCJ51CA-M3/57T has no polarity marking and identical electrical behavior in both directions, so PCB layout requires no orientation-specific placement-unlike unidirectional variants such as SMCJ51A-M3/57T, which feature a cathode band. This simplifies routing on differential pairs, AC-coupled lines, or floating grounds, and eliminates risk of assembly error. The SMCJ51CA-M3/57T's DO-214AB package still requires symmetric 8.0 mm × 8.0 mm copper pads per terminal to meet thermal and surge-rating specifications.
What is the maximum leakage current of SMCJ51CA-M3/57T at its standoff voltage?
At its rated standoff voltage (VWM) of 51 V and TA = 25 °C, the SMCJ51CA-M3/57T exhibits a maximum reverse leakage current (ID) of 1.0 µA. This low leakage ensures minimal power loss in always-on systems and avoids unintended biasing of downstream circuitry. The SMCJ51CA-M3/57T maintains this specification across its full operating temperature range (–55 °C to +150 °C), with leakage increasing predictably per datasheet derating curves.
Can SMCJ51CA-M3/57T be used in place of a unidirectional TVS like SMCJ51A-M3/57T?
SMCJ51CA-M3/57T can replace SMCJ51A-M3/57T only if bidirectional clamping is acceptable and required in the target application-for example, on AC signal lines or floating buses. However, it cannot substitute in DC circuits where forward conduction must be blocked, since the SMCJ51CA-M3/57T conducts in both directions. The SMCJ51CA-M3/57T also lacks the cathode band marking, so physical orientation becomes irrelevant. Always verify system-level polarity requirements before substitution.
SMCJ51CA-M3/57T 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:
- -
- Bidirectional Channels:
- 1
- 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 (SMC)
SMCJ51CA-M3/57T FAQ
1.How can I place an order for SMCJ51CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CA-M3/57T 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 SMCJ51CA-M3/57T reliable?
The price and inventory of SMCJ51CA-M3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ51CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CA-M3/57T?
SMCJ51CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CA-M3/57T 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 SMCJ51CA-M3/57T?
For technical support, including SMCJ51CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CA-M3/57T requirements.
6.How does Aetrix verify that SMCJ51CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ51CA-M3/57T 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 SMCJ51CA-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ51CA-M3/57T?
All SMCJ51CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CA-M3/57T, 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 SMCJ51CA-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ51CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51CA-M3/57T Tags
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