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Vishay General Semiconductor - Diodes Division SMCJ75CA-M3/57T
- Part No.:
- SMCJ75CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ75CA-M3/57T.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,175
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Product details
Overview
SMCJ75CA-M3/57T from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients up to 121 V at 12.4 A peak pulse current under 10/1000 µs waveform, with 75 V standoff voltage and 1500 W peak pulse power rating. It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive, industrial, and telecom systems against inductive switching surges and lightning-induced transients.
For engineers reviewing the SMCJ75CA-M3/57T datasheet, SMCJ75CA-M3/57T pinout, SMCJ75CA-M3/57T application, or SMCJ75CA-M3/57T equivalent, key selection criteria include bidirectional clamping capability, 121 V max clamping voltage at rated surge current, halogen-free RoHS-compliant construction, AEC-Q101 qualification eligibility via HM3 suffix variants, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamping protection device across two terminals, responding within picoseconds to transient overvoltages exceeding its reverse standoff voltage (VWM = 75 V). Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity marking requirements and simplifying layout in AC-coupled or differential signal paths.
The device uses a glass-passivated silicon junction with low incremental surge resistance and meets MSL Level 1 per J-STD-020 (260 °C peak reflow), enabling robust thermal performance in high-energy surge events. Its 75 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature when mounted on recommended 8.0 mm × 8.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working range for protected circuitry. |
| VBR min/max | 83.3 V / 92.1 V at 1 mA - Verified breakdown threshold range ensuring reliable turn-on during transients without premature conduction. |
| VC @ IPPM | 121 V at 12.4 A - Clamped voltage seen by downstream components during full-rated 10/1000 µs surge, limiting stress on protected devices. |
| PPPM | 1500 W - Peak transient energy absorption capacity under standardized waveform, critical for lightning and EFT immunity compliance. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm body and 2.62 mm height, optimized for automated assembly and thermal pad coupling. |
| RoHS Status | Halogen-free, RoHS-compliant - Meets environmental compliance requirements for commercial and automotive electronics without brominated flame retardants. |
| TJ max | +150 °C - Maximum allowable junction temperature, supporting operation in under-hood automotive and high-temperature industrial environments. |
Pinout & Package
SMCJ75CA-M3/57T is a 2-terminal bidirectional TVS diode housed in the SMC (DO-214AB) package. No polarity marking is present on the case, reflecting symmetrical terminal function.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals serve identically as clamping nodes; no cathode band or polarity designation required for bidirectional operation. |
| Case (exposed metal tab) | Thermal conduction path | Integral heat-spreading surface soldered to PCB copper pad; contributes to RθJA = 75 °C/W performance when using 8.0 mm × 8.0 mm pads. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), and ungrounded circuits without polarity constraints. |
| 1500 W peak pulse power | Supports IEC 61000-4-5 Level 4 (4 kV line-earth) surge testing when properly laid out with adequate PCB copper area. |
| Low clamping ratio (VC/VBR ≈ 1.31) | Minimizes voltage overshoot during clamping, reducing stress on downstream 75 V-rated components such as automotive power management ICs. |
| MSL Level 1 rating | Permits use in standard lead-free reflow profiles (peak 260 °C) without moisture sensitivity concerns or baking requirements. |
| AEC-Q101 qualification path | HM3 suffix variants are qualified for automotive applications; this M3 variant shares identical die and construction, enabling qualification traceability. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails feeding ECUs, lighting modules, and body control units from load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary clamping element placed at board-level input connector to shunt surge energy before it reaches DC-DC converters and microcontrollers. Use Value: Limits transient voltage to ≤121 V during 12.4 A surges, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic and power ICs. | Use Scenario: Shielding analog outputs (e.g., 4–20 mA, 0–10 V) and digital interfaces (CAN, LIN) in factory-floor pressure, temperature, and flow sensors. IC Role / Device Role / Timing Role: Bidirectional transient suppressor on signal pairs to absorb ESD and fast transients induced by nearby motor drives or relay switching. Use Value: Maintains signal integrity by clamping ±121 V spikes without polarity biasing, preserving accuracy of sub-mV-level sensor measurements. |
| Telecom Line Interface | Consumer Equipment AC Input Stage |
Use Scenario: Safeguarding Ethernet PHYs, DSL line drivers, and POTS interface ICs against lightning-induced surges entering via RJ-45 or telephone jacks. IC Role / Device Role / Timing Role: First-stage protector on unshielded twisted-pair lines, coordinated with gas discharge tubes or MOVs for multi-stage protection. Use Value: Responds in <1 ps to limit induced common-mode voltages to safe levels before secondary protection stages activate, reducing system failure rate. | Use Scenario: Protecting switch-mode power supply inputs in TVs, set-top boxes, and smart home hubs against mains-borne surges and capacitor discharge events. IC Role / Device Role / Timing Role: Secondary-level TVS placed after fuse and primary MOV, providing precise clamping where fast response and low leakage are critical. Use Value: Delivers 75 V standoff with <1 μA leakage at rated voltage, avoiding standby power loss while maintaining 1500 W surge handling for UL 62368-1 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75CA-M3/57T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM and VC but reduced surge current handling (5.2 A). | Suitable for lower-energy transients; limited to Class B IEC 61000-4-5 testing without external coordination. | Select when board space is constrained and surge threat level is moderate (e.g., internal signal lines). |
| SMCJ75A-M3/57T | Unidirectional version with cathode band marking; identical VWM, VC, and PPPM but asymmetric conduction (forward-biased during positive half-cycles). | Requires polarity-aware layout; used where DC bias exists and negative transients dominate (e.g., automotive battery feeds). | Choose only when circuit topology guarantees defined polarity and bidirectional clamping is unnecessary. |
Compared with SMBJ75CA-M3/57T, SMCJ75CA-M3/57T delivers 2.5× higher surge power handling in the same footprint family, while SMCJ75A-M3/57T trades bidirectional flexibility for marginally better forward conduction in DC-biased rails-making SMCJ75CA-M3/57T optimal for AC, differential, or polarity-agnostic protection.
Availability
SMCJ75CA-M3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, telecom line protection, and consumer AC input stage designs requiring stable component supply and halogen-free compliance.
Supply support for SMCJ75CA-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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade qualification.
The SMCJ series was engineered for high-energy transient suppression in harsh environments, targeting design-in for automotive, industrial, and infrastructure applications where robustness against lightning, ESD, and load dump is mandatory.
FAQ
What is the maximum clamping voltage of the SMCJ75CA-M3/57T under rated surge conditions?
The SMCJ75CA-M3/57T exhibits a maximum clamping voltage (VC) of 121 V when subjected to its rated 10/1000 µs peak pulse current of 12.4 A. This value is measured per ANSI/IEEE C62.35 standards and reflects worst-case voltage stress imposed on protected circuitry during full-power transient events. The SMCJ75CA-M3/57T maintains this clamping performance across its operational temperature range of -55 °C to +150 °C.
Is the SMCJ75CA-M3/57T suitable for automotive applications?
Yes, the SMCJ75CA-M3/57T is constructed using the same die and packaging process as AEC-Q101-qualified variants (e.g., SMCJ75CA-HM3_X). While the M3 suffix denotes halogen-free RoHS compliance for commercial use, its thermal, electrical, and mechanical specifications-including 150 °C junction rating, MSL Level 1 reflow capability, and glass-passivated junction-are fully aligned with automotive environmental requirements. System-level qualification remains the customer's responsibility.
How does the bidirectional nature of the SMCJ75CA-M3/57T affect PCB layout?
The SMCJ75CA-M3/57T has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. This simplifies layout for AC-coupled interfaces like RS-485, CAN, or Ethernet PHYs, where traditional unidirectional TVS diodes would require careful anode/cathode alignment. The SMCJ75CA-M3/57T can be placed symmetrically across differential pairs or across power/return paths without concern for terminal assignment.
What is the thermal resistance of the SMCJ75CA-M3/57T and how does it impact derating?
The SMCJ75CA-M3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the recommended 8.0 mm × 8.0 mm copper pads per terminal. This value directly governs power derating above 25 °C ambient: for example, at 70 °C ambient, its steady-state power dissipation must be reduced to ~3.6 W to maintain TJ ≤ 150 °C. Surge ratings remain valid per Fig. 2 in the datasheet, as transient events do not significantly raise average junction temperature.
Can the SMCJ75CA-M3/57T replace a unidirectional TVS like SMCJ75A-M3/57T in an existing design?
The SMCJ75CA-M3/57T can replace SMCJ75A-M3/57T only if the circuit lacks DC bias or requires symmetrical clamping-such as on AC signal lines, transformer-coupled interfaces, or floating power domains. In DC-biased rails (e.g., automotive battery feeds), the unidirectional SMCJ75A-M3/57T provides lower forward voltage drop during normal operation, whereas the SMCJ75CA-M3/57T conducts in both directions and may increase leakage. Layout changes are not needed, but functional validation is essential.
SMCJ75CA-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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 12.4A
- 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)
SMCJ75CA-M3/57T FAQ
1.How can I place an order for SMCJ75CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ75CA-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 SMCJ75CA-M3/57T reliable?
The price and inventory of SMCJ75CA-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 SMCJ75CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ75CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ75CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ75CA-M3/57T?
SMCJ75CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ75CA-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 SMCJ75CA-M3/57T?
For technical support, including SMCJ75CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ75CA-M3/57T requirements.
6.How does Aetrix verify that SMCJ75CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ75CA-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 SMCJ75CA-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ75CA-M3/57T?
All SMCJ75CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ75CA-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 SMCJ75CA-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ75CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ75CA-M3/57T Tags
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