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Vishay General Semiconductor - Diodes Division SMCJ45CA-E3/57T
- Part No.:
- SMCJ45CA-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CA-E3/57T.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMCJ45CA-E3/57T 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 1500 W peak pulse power with a 10/1000 μs waveform, 72.7 V maximum clamping voltage at 20.6 A peak pulse current, and 45 V stand-off voltage - deployed in automotive sensor signal lines, industrial I/O protection, and telecom interface circuits.
For engineers reviewing the SMCJ45CA-E3/57T datasheet, SMCJ45CA-E3/57T pinout, SMCJ45CA-E3/57T application, or SMCJ45CA-E3/57T equivalent, key selection criteria include bidirectional clamping capability, 1500 W surge rating, RoHS-compliant matte tin-plated leads, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ45CA-E3/57T operates as a bidirectional avalanche diode with symmetrical breakdown characteristics in both polarities, enabling transient suppression without polarity dependency. Its glass-passivated junction ensures stable VBR (min 50.0 V, max 55.3 V at 1.0 mA test current) and low incremental surge resistance for consistent clamping performance under repetitive surges.
Thermal design relies on RθJA = 75 °C/W (typical, on recommended pad layout) and RθJL = 15 °C/W, supporting operation across -55 °C to +150 °C junction temperature range. It meets AEC-Q101 qualification when ordered with HE3/HM3 suffixes, though SMCJ45CA-E3/57T itself is commercial-grade RoHS-compliant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VWM) | 45 V - Maximum continuous reverse operating voltage before significant leakage; defines circuit's normal operating margin. |
| Breakdown Voltage (VBR) | 50.0–55.3 V at 1.0 mA - Confirmed symmetric avalanche threshold in both directions; ensures predictable turn-on during transients. |
| Clamping Voltage (VC) | 72.7 V at 20.6 A IPPM - Peak voltage seen by protected circuit during 1500 W 10/1000 μs surge; critical for downstream IC survival. |
| Peak Pulse Power (PPPM) | 1500 W - Sustained energy-handling capacity per single transient event; validated on 8.0 mm × 8.0 mm copper pads. |
| Leakage Current (ID) | ≤1.0 μA at 45 V - Ultra-low reverse bias current preserves signal integrity and minimizes standby power loss. |
| Operating Temperature | -55 °C to +150 °C - Enables deployment in under-hood automotive, industrial control cabinets, and outdoor telecom enclosures. |
| Package | SMC (DO-214AB) - Standardized surface-mount outline with 7.75 mm × 6.22 mm body, compatible with JEDEC MS-013AC footprint. |
Pinout & Package
SMCJ45CA-E3/57T uses the SMC (DO-214AB) package: a molded plastic case with two coplanar matte tin-plated terminals, no polarity marking (bidirectional), compliant with UL 94 V-0 flammability rating and J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode / Cathode (symmetrical) | Bidirectional conduction path - either terminal serves as anode or cathode depending on transient polarity; no orientation required during placement. |
| Terminal 2 | Anode / Cathode (symmetrical) | Identical electrical role to Terminal 1; device functions identically regardless of PCB layout orientation. |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power rating | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-line) without derating on standard PCB copper. |
| Glass passivated junction | Ensures long-term stability of breakdown voltage and leakage current over temperature and lifetime, critical for automotive and industrial field reliability. |
| MSL Level 1 rating | Allows unlimited floor life and reflow at 260 °C peak without baking, simplifying high-volume SMT manufacturing flow. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on protected ICs - e.g., 72.7 V clamp limits exposure of 48 V systems to <1.5× nominal rail. |
| RoHS-compliant, matte tin plating | Supports lead-free assembly and eliminates whisker risk per JESD 201 Class 2, meeting IPC-J-STD-006B solder joint reliability requirements. |
Applications
| Automotive Sensor Protection | Industrial PLC Digital I/O |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ISO 7637-2 pulses in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to shunt transients before reaching signal conditioning circuitry. Use Value: Withstand 1500 W surges while maintaining ≤72.7 V clamping, preventing latch-up or gate oxide damage in 5 V/12 V sensor front-ends. |
Use Scenario: Safeguarding 24 V digital input modules in programmable logic controllers against inductive kickback from solenoid/relay switching. IC Role / Device Role / Timing Role: Fast-response TVS placed across input terminals to divert >100 A surge currents away from optocoupler or Schmitt trigger inputs. Use Value: 20.6 A IPPM rating and 1.0 μA leakage ensure reliable detection of valid 24 V logic states while blocking false triggers from EFT bursts. |
| Telecom Line Interface | Consumer Power Adapter Feedback Loop |
|
Use Scenario: Shielding RS-485/RS-232 transceivers and Ethernet PHYs from lightning-induced surges on outdoor data lines. IC Role / Device Role / Timing Role: Primary-level transient suppressor mounted at board edge, coordinated with GDT or MOV secondary protection stages. Use Value: Symmetric 45 V VWM and 72.7 V VC align with common telecom interface voltage rails, enabling direct integration without level-shifting. |
Use Scenario: Securing optocoupler feedback paths in isolated AC/DC adapters against coupling noise from primary-side MOSFET switching. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF typical) bidirectional clamp across secondary-side error amplifier inputs. Use Value: Sub-μA leakage at 45 V prevents DC bias shift in TL431-based feedback networks, preserving regulation accuracy under steady-state conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ45CA-E3/61 | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W), same VWM/VC specs. | Limited to lower-energy transients (e.g., ESD-only); unsuitable for IEC 61000-4-5 or inductive switching events. | Select when board space is constrained and surge threat level is limited to ±15 kV contact ESD per IEC 61000-4-2. |
| SMCJ45A-E3/57T | Unidirectional version; includes cathode band marking; identical VWM, VBR, VC, and PPPM, but requires correct polarity orientation. | Applicable only where circuit topology enforces defined DC bias direction (e.g., DC power rail protection). | Choose only if system architecture guarantees unidirectional transient polarity and layout allows strict orientation control. |
Compared with SMAJ45CA-E3/61 and SMCJ45A-E3/57T, the SMCJ45CA-E3/57T delivers full 1500 W surge immunity in a polarity-agnostic form factor - making it the sole option among the three for bidirectional, high-energy protection in space-constrained yet thermally demanding applications like automotive body control modules.
Availability
SMCJ45CA-E3/57T is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, full traceability, and compliance with RoHS and J-STD-002 solderability standards.
Supply support for SMCJ45CA-E3/57T 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, thermal performance, and automotive qualification.
The SMCJ series was engineered specifically for high-power transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal fidelity or long-term stability.
FAQ
What is the maximum clamping voltage of the SMCJ45CA-E3/57T under a 10/1000 μs surge?
The SMCJ45CA-E3/57T has a maximum clamping voltage (VC) of 72.7 V at 20.6 A peak pulse current (IPPM) under a 10/1000 μs waveform. This value is measured with the device mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay datasheet revision 09-Jan-2024. The SMCJ45CA-E3/57T maintains this clamping performance bidirectionally due to its symmetrical construction.
Is the SMCJ45CA-E3/57T suitable for automotive applications requiring AEC-Q101 qualification?
The SMCJ45CA-E3/57T is RoHS-compliant and commercial-grade, but not AEC-Q101 qualified. For automotive use, Vishay offers the SMCJ45CAHE3 variant (with HE3 suffix), which carries AEC-Q101 qualification and identical electrical specs. The SMCJ45CA-E3/57T remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated, such as infotainment or comfort electronics.
Does the SMCJ45CA-E3/57T have polarity markings on the package?
No, the SMCJ45CA-E3/57T has no polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMCJ45A-E3/57T), which feature a cathode band, the SMCJ45CA-E3/57T functions identically regardless of orientation on the PCB. This eliminates placement errors and simplifies automated assembly - a key advantage confirmed in the Vishay SMCJ5.0A–SMCJ188CA datasheet.
What is the thermal resistance from junction to ambient for the SMCJ45CA-E3/57T?
The typical thermal resistance from junction to ambient (RθJA) for the SMCJ45CA-E3/57T is 75 °C/W, measured on the minimum recommended pad layout (0.31" × 0.31" copper pads). This value assumes natural convection and is critical for calculating safe power derating above 25 °C ambient. The SMCJ45CA-E3/57T also has RθJL = 15 °C/W, supporting efficient heat transfer to PCB traces or heatsinks.
Can the SMCJ45CA-E3/57T replace the SMCJ45A-E3/57T in an existing design?
The SMCJ45CA-E3/57T can replace the unidirectional SMCJ45A-E3/57T only if the circuit does not rely on polarity-specific behavior - for example, in AC-coupled or floating signal lines. However, it cannot substitute in DC-biased applications where cathode/anode orientation matters (e.g., power rail clamping), since the SMCJ45CA-E3/57T lacks polarity marking and exhibits symmetrical conduction. Always verify layout and transient polarity assumptions before substitution.
SMCJ45CA-E3/57T 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 20.6A
- 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)
SMCJ45CA-E3/57T FAQ
1.How can I place an order for SMCJ45CA-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CA-E3/57T 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 SMCJ45CA-E3/57T reliable?
The price and inventory of SMCJ45CA-E3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ45CA-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ45CA-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CA-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CA-E3/57T?
SMCJ45CA-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CA-E3/57T 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 SMCJ45CA-E3/57T?
For technical support, including SMCJ45CA-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CA-E3/57T requirements.
6.How does Aetrix verify that SMCJ45CA-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ45CA-E3/57T 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 SMCJ45CA-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ45CA-E3/57T?
All SMCJ45CA-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CA-E3/57T, 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 SMCJ45CA-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ45CA-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45CA-E3/57T Tags
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