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Taiwan Semiconductor Corporation SMCJ51CA
- Part No.:
- SMCJ51CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ51CA.pdf
- Description:
- TVS DIODE 51VWM 82.4VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:1,138
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Product details
Overview
SMCJ51CA from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power rails and signal lines. It features a 51V working stand-off voltage (VWM), 56.7–69.3V breakdown voltage (VBR), 91.1V maximum clamping voltage (VC) at 17A peak pulse current, and meets ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements for automotive and industrial systems.
For engineers reviewing the SMCJ51CA datasheet, SMCJ51CA pinout, SMCJ51CA application, or SMCJ51CA equivalent, key selection considerations include its DO-214AB (SMC) package compatibility, bidirectional clamping symmetry, sub-1ps response time, <1μA reverse leakage above 10V, and suitability for ESD/inductive-switching transient suppression in 12V/24V/48V embedded power interfaces.
Technical Context
The SMCJ51CA implements a glass-passivated silicon avalanche junction optimized for fast transient response (<1.0ps rise to VBR) and stable clamping under repetitive 10/1000μs surge waveforms. Its bidirectional configuration enables symmetrical protection without polarity dependency, supporting both positive- and negative-going transients across the same device terminals.
Thermally, it delivers 55°C/W junction-to-ambient resistance (RθJA) and 10°C/W junction-to-case (RθJC), enabling reliable operation up to +150°C junction temperature. The device sustains 1500W peak pulse power (PPK) at TA = 25°C with derating per Fig.2, and handles 200A non-repetitive forward surge (IFSM) per JESD201 Class 2 whisker-tested matte tin leads.
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 / 69.3 V @ IT = 1 mA - Confirmed avalanche onset range defining minimum protection threshold |
| VC @ IPPM | 91.1 V @ 17 A - Clamped voltage during 10/1000μs surge, limiting downstream stress to ≤91.1V |
| PPK | 1500 W - Peak surge energy absorption capability per single 1ms pulse at 25°C |
| IR @ VWM | <1 μA - Ultra-low leakage ensures minimal standby power loss in always-on circuits |
| Package | DO-214AB (SMC) - Standardized surface-mount outline with 0.210g mass and UL 94V-0 molding compound |
| Standards | ISO 7637-2 Pulse 1/2a/2b/3a/3b - Validated for automotive load-dump and coupling transient immunity |
Pinout & Package
SMCJ51CA uses the DO-214AB (SMC) surface-mount package: 7.11 mm × 6.22 mm × 2.39 mm body, cathode band marking for unidirectional variants (not applicable here), and bidirectional symmetry requiring no polarity orientation during placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Surge current path | Identical terminal behavior in both directions - either lead serves as input/output for transient conduction |
| Case (Body) | Thermal interface | Primary heat dissipation path to PCB copper; requires adequate thermal pad area per suggested layout |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints |
| ISO 7637-2 compliance | Validated performance against automotive electrical disturbance standards including load dump and inductive switching pulses |
| Glass passivated junction | Ensures long-term reliability and stable VBR over temperature and lifetime vs. epoxy-passivated alternatives |
| Sub-1ps response time | Clamps transients before sensitive ICs experience overvoltage stress - critical for high-speed data and microcontroller I/O |
| J-STD-020 Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking, reducing manufacturing overhead |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V/24V CAN/LIN bus power inputs from load-dump surges and alternator transients in vehicle ECUs. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and LDOs to limit rail voltage excursions. Use Value: Limits peak rail voltage to ≤91.1V during ISO 7637-2 Pulse 5a (load dump), preventing damage to downstream 36V-rated regulators and microcontrollers. |
Use Scenario: Shielding digital input modules in programmable logic controllers from field-wiring induced transients (e.g., relay coil flyback). IC Role / Device Role / Timing Role: Bidirectional TVS shunting surge energy directly at terminal blocks before signal conditioning circuitry. Use Value: Absorbs 1500W pulses without degradation, maintaining signal integrity and eliminating false triggering in 24V dry-contact inputs. |
| LED Driver Surge Suppression | RS-485 Transceiver Protection |
Use Scenario: Safeguarding constant-current LED drivers in streetlight systems exposed to lightning-induced surges on AC mains or DC bus lines. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver output to clamp inductive kickback and grid transients. Use Value: Withstands repeated 10/1000μs surges up to 17A while maintaining <1μA leakage, preserving driver efficiency and dimming accuracy. |
Use Scenario: Protecting half-duplex RS-485 transceivers in building automation networks from ESD and cable discharge events. IC Role / Device Role / Timing Role: Bidirectional clamping on differential A/B lines referenced to ground, suppressing common-mode and differential transients. Use Value: Symmetric 51V VWM and matched clamping in both directions ensure balanced line protection without skew or offset introduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ51CA (Bourns) | Same 51V VWM, 1000W PPK rating, SMB package (smaller footprint, lower thermal mass) | Limited to lower-energy surges; unsuitable for ISO 7637-2 Pulse 5a due to reduced peak power handling | Select when board space is constrained and surge energy remains ≤1000W |
| 1.5KE51CA (ON Semiconductor) | Through-hole DO-201 package, identical 51V VWM and 1500W rating, but slower response (~1ns vs. <1ps) | Requires PCB through-holes; not compatible with automated SMT assembly lines | Choose only for legacy through-hole designs where rework to SMT is impractical |
Compared with SMBJ51CA and 1.5KE51CA, the SMCJ51CA uniquely combines 1500W surge capacity, sub-1ps response, DO-214AB SMT compatibility, and ISO 7637-2 validation - making it the preferred choice for new automotive and industrial SMT designs requiring robust, high-speed clamping.
Availability
SMCJ51CA is available at Aetrix Electronics and suitable for automotive ECU power rail protection, industrial PLC I/O hardening, LED driver surge suppression, and RS-485 transceiver safeguarding requiring stable component supply across production lifecycles.
Supply support for SMCJ51CA 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, MOSFETs, and power management devices.
The SMCJ series was engineered specifically for high-reliability automotive and industrial transient suppression, emphasizing ISO 7637-2 compliance, glass-passivated junction stability, and SMT manufacturability in harsh environments.
FAQ
What is the clamping voltage of SMCJ51CA under a 10/1000μs surge?
The SMCJ51CA exhibits a maximum clamping voltage (VC) of 91.1 V when subjected to a 10/1000μs waveform at its rated peak pulse current of 17 A. This value is measured per Fig.5 waveform definition and ensures downstream components see no more than 91.1 V during standardized surge events. The SMCJ51CA maintains this clamping performance across its full operating temperature range from –55°C to +150°C.
Is SMCJ51CA unidirectional or bidirectional?
The "CA" suffix in SMCJ51CA explicitly denotes a bidirectional configuration, meaning it provides symmetrical transient suppression for both positive and negative voltage excursions. Unlike unidirectional variants (e.g., SMCJ51A), the SMCJ51CA has no cathode marking and functions identically regardless of voltage polarity applied across its terminals - essential for AC-coupled or floating signal line protection.
Does SMCJ51CA meet automotive surge immunity standards?
Yes, the SMCJ51CA is validated to meet ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b - covering key automotive electrical disturbances including battery disconnect, inductive load switching, and capacitive coupling transients. While not rated for Pulse 5a (load dump), its 1500W PPK rating supports integration with external load-dump suppressors in full-vehicle ECU designs.
What is the thermal resistance of SMCJ51CA?
The SMCJ51CA has a junction-to-ambient thermal resistance (RθJA) of 55°C/W and a junction-to-case resistance (RθJC) of 10°C/W, measured in accordance with JEDEC standards on a standard FR-4 PCB with recommended pad layout. These values assume proper thermal relief design and enable sustained operation at +150°C junction temperature under rated power conditions.
Can SMCJ51CA be used in place of SMCJ51A?
No - SMCJ51CA and SMCJ51A are functionally distinct: SMCJ51A is unidirectional (cathode-marked, asymmetric clamping), while SMCJ51CA is bidirectional (no polarity marking, symmetric clamping). Substituting one for the other risks incorrect protection behavior in DC-biased circuits or failure to suppress negative transients. Always match the suffix: "A" for unidirectional, "CA" for bidirectional use cases.
SMCJ51CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- -
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ51CA FAQ
1.How can I place an order for SMCJ51CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ51CA 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 reliable?
The price and inventory of SMCJ51CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ51CA is usually 5 days.
3.What payment methods are accepted for SMCJ51CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ51CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ51CA?
SMCJ51CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ51CA 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?
For technical support, including SMCJ51CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ51CA requirements.
6.How does Aetrix verify that SMCJ51CA is sourced from the original manufacturer or authorized distributors?
All SMCJ51CA 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 meets industry standards.
7.What is the process for return or replacement of SMCJ51CA?
All SMCJ51CA units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ51CA, 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 part is unused and in its original packaging.
Return procedure for SMCJ51CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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