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Vishay General Semiconductor - Diodes Division SMCJ51CA-M3/9AT
- Part No.:
- SMCJ51CA-M3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CA-M3/9AT.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,892
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Product details
Overview
SMCJ51CA-M3/9AT 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 clamping voltage (VC) at 18.2 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) with 10/1000 μs waveform - deployed across automotive sensor lines, industrial I/O ports, and telecom interface circuits.
For engineers reviewing the SMCJ51CA-M3/9AT datasheet, SMCJ51CA-M3/9AT pinout, SMCJ51CA-M3/9AT application, or SMCJ51CA-M3/9AT equivalent, key selection criteria include bidirectional clamping capability, low incremental surge resistance, AEC-Q101 qualification eligibility (via HM3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with breakdown voltage (VBR) specified at 56.7–62.7 V (min/max) under 1 mA test current. Its clamping behavior follows IEEE C62.35 standards, delivering consistent VC ≤ 82.4 V up to IPPM = 18.2 A, enabling reliable protection against ESD, lightning-induced surges, and inductive switching transients.
Thermally, it sustains operation from −55 °C to +150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W. The halogen-free, RoHS-compliant M3 termination meets JESD 201 Class 2 whisker resistance and J-STD-002 solderability requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 56.7 V / 62.7 V at IT = 1 mA - ensures predictable turn-on threshold across production lot |
| VC @ IPPM | 82.4 V at 18.2 A - limits downstream voltage stress during 10/1000 μs surge events |
| PPPM | 1500 W - supports high-energy transient suppression without thermal runaway |
| ID @ VWM | 1.0 μA - ultra-low leakage preserves signal integrity in high-impedance circuits |
| TJ max | +150 °C - enables use in under-hood automotive and industrial ambient environments |
| Package | SMC (DO-214AB) - surface-mount footprint compatible with standard SMT reflow profiles |
Pinout & Package
SMCJ51CA-M3/9AT uses the SMC (DO-214AB) package: a molded, halogen-free, UL 94 V-0 compliant case with matte tin-plated leads. Bidirectional construction means no polarity marking; both terminals are functionally identical.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts surge current during negative-going transients; symmetrical with cathode |
| Cathode | Transient current entry (positive polarity) | Accepts surge current during positive-going transients; symmetrical with anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 1500 W peak pulse power | Withstands high-energy surges common in automotive load-dump and industrial motor-switching environments |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes voltage overshoot during clamping, reducing risk to downstream ICs like CAN transceivers or ADCs |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow without moisture-related popcorning or delamination |
| AEC-Q101 qualification path | HM3 suffix variants meet automotive reliability standards for engine control, ADAS sensors, and body electronics |
Applications
| Automotive Sensor Protection | Industrial I/O Port Protection |
|---|---|
Use Scenario: Protecting LIN/CAN bus nodes and analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt surge energy before reaching signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to microcontrollers and analog front-ends by limiting transient voltage to ≤ 82.4 V during 10/1000 μs surges. | Use Scenario: Safeguarding PLC digital input modules and RS-485 transceivers against field-wiring induced surges in factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on signal lines interfacing with long cables exposed to inductive switching noise. Use Value: Maintains system uptime by absorbing up to 1500 W surge energy without degradation, verified per IEC 61000-4-5 Level 4. |
| Telecom Interface Protection | Consumer Power Adapter Input Stage |
Use Scenario: Shielding Ethernet PHYs, DSL line drivers, and PoE injectors from lightning-induced surges on outdoor-facing ports. IC Role / Device Role / Timing Role: First-line transient suppressor mounted adjacent to RJ-45 jack or line transformer secondary. Use Value: Clamps transients within nanoseconds (typical response < 1 ps), preserving signal integrity while meeting GR-1089-CORE telecom immunity requirements. | Use Scenario: Secondary-side surge protection in AC/DC adapters for smart home devices, preventing failure due to mains-borne transients. IC Role / Device Role / Timing Role: Standoff-rated clamp across DC output rails to protect downstream LDOs and USB controllers. Use Value: Delivers 1.0 μA max leakage at 51 V, avoiding standby power waste while ensuring fast clamping during 1500 W surge events. |
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-TB-E3 | Same VWM (51 V), lower PPPM (1000 W), DO-214AA (SMA) package | Lower power handling suits space-constrained consumer designs; not recommended for automotive load-dump | Select when board area is critical and surge energy is ≤ 1000 W |
| 1.5KE51CA | Same VWM (51 V), axial-leaded DO-15 package, higher VF, slower thermal response | Through-hole mounting only; unsuitable for high-density SMT layouts or automated assembly | Choose only for legacy through-hole designs or prototyping where rework tolerance is prioritized |
Compared with SAC51CA-TB-E3 and 1.5KE51CA, SMCJ51CA-M3/9AT delivers superior surge robustness (1500 W vs. 1000 W/-), SMT scalability, and thermal performance (RθJL = 15 °C/W), making it optimal for volume automotive and industrial production.
Availability
SMCJ51CA-M3/9AT is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line card protection requiring stable component supply and halogen-free compliance.
Supply support for SMCJ51CA-M3/9AT 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series targets high-power transient suppression in harsh environments, engineered for automotive, industrial, and telecom systems demanding AEC-Q101 readiness, low clamping voltage, and repeatable surge endurance.
FAQ
What is the clamping voltage of SMCJ51CA-M3/9AT at its rated peak pulse current?
The SMCJ51CA-M3/9AT has a maximum clamping voltage (VC) of 82.4 V when subjected to its rated peak pulse current (IPPM) of 18.2 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable voltage limiting during surge events. The SMCJ51CA-M3/9AT maintains this clamping performance across its full operating temperature range of −55 °C to +150 °C.
Is SMCJ51CA-M3/9AT suitable for automotive applications?
Yes - the SMCJ51CA-M3/9AT is halogen-free and RoHS-compliant, and its base part SMCJ51CA is qualified to AEC-Q101 when ordered with the HM3 suffix (e.g., SMCJ51CAHM3_A/I). It meets MSL Level 1 per J-STD-020 and supports peak reflow temperatures up to 260 °C. The SMCJ51CA-M3/9AT is widely used in automotive body control modules, sensor interfaces, and infotainment power rails.
How does the bidirectional design of SMCJ51CA-M3/9AT affect its PCB layout?
The SMCJ51CA-M3/9AT has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. Unlike unidirectional TVS diodes, it requires no cathode band alignment, simplifying automated optical inspection and reducing assembly errors. Its SMC (DO-214AB) footprint remains unchanged, but layout must still follow Vishay's recommended 8.0 mm × 8.0 mm copper pad areas per terminal for thermal and surge performance.
What is the maximum reverse leakage current of SMCJ51CA-M3/9AT at its standoff voltage?
The SMCJ51CA-M3/9AT exhibits a maximum reverse leakage current (ID) of 1.0 μA when biased at its standoff voltage (VWM) of 51 V, measured at TA = 25 °C. This ultra-low leakage ensures minimal power loss in battery-powered or high-impedance sensing circuits. Leakage remains below 5 μA up to 85 °C ambient, supporting reliable operation in extended-temperature industrial deployments.
Can SMCJ51CA-M3/9AT replace older SMA-package TVS diodes like P6KE51CA?
No - SMCJ51CA-M3/9AT is not a direct replacement for P6KE51CA due to differences in package (SMC vs. DO-15), thermal resistance (RθJA = 75 °C/W vs. ~100 °C/W), and surge rating (1500 W vs. 600 W). While both share 51 V VWM and bidirectional operation, the SMCJ51CA-M3/9AT requires larger copper pads and delivers higher power handling. Migration requires layout review and thermal validation; the SMCJ51CA-M3/9AT is not a drop-in substitute.
SMCJ51CA-M3/9AT 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:
- -
- 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-M3/9AT FAQ
1.How can I place an order for SMCJ51CA-M3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CA-M3/9AT 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 SMCJ51CA-M3/9AT reliable?
The price and inventory of SMCJ51CA-M3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CA-M3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ51CA-M3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CA-M3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CA-M3/9AT?
SMCJ51CA-M3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CA-M3/9AT 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 SMCJ51CA-M3/9AT?
For technical support, including SMCJ51CA-M3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CA-M3/9AT requirements.
6.How does Aetrix verify that SMCJ51CA-M3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ51CA-M3/9AT 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 SMCJ51CA-M3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ51CA-M3/9AT?
All SMCJ51CA-M3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CA-M3/9AT, 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 SMCJ51CA-M3/9AT part is unused and in its original packaging.
Return procedure for SMCJ51CA-M3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ51CA-M3/9AT Tags
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