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Vishay General Semiconductor - Diodes Division SMCJ45CA-M3/57T
- Part No.:
- SMCJ45CA-M3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45CA-M3/57T.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,080
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Product details
Overview
SMCJ45CA-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 45 V stand-off voltage (VWM), 72.7 V maximum clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (10/1000 µs waveform), commonly deployed on power rails and signal lines in automotive and industrial control systems.
For engineers reviewing the SMCJ45CA-M3/57T datasheet, SMCJ45CA-M3/57T pinout, SMCJ45CA-M3/57T application, or SMCJ45CA-M3/57T equivalent, key selection criteria include bidirectional clamping symmetry, 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 device operates as a voltage-clamping protector using an avalanche breakdown mechanism, with symmetrical breakdown characteristics in both directions due to its bidirectional construction. Its 72.7 V clamping voltage at 20.6 A ensures predictable energy diversion during transients such as ISO 7637-2 load dump or IEC 61000-4-5 surges.
Thermal performance is defined by RθJA = 75 °C/W (junction-to-ambient, on recommended pad layout) and RθJL = 15 °C/W (junction-to-lead), supporting reliable operation up to TJ = +150 °C. The halogen-free, RoHS-compliant M3 termination meets JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working margin. |
| VBR min / max | 50.0 V / 55.3 V - Breakdown voltage range at 1 mA test current; guarantees consistent turn-on threshold across production lots. |
| VC @ IPPM | 72.7 V - Clamped voltage at 20.6 A peak pulse current (10/1000 µs); determines maximum stress imposed on protected circuitry. |
| PPPM | 1500 W - Peak pulse power handling capability; enables suppression of high-energy transients without failure. |
| IPPM | 20.6 A - Peak pulse current supported at rated clamping voltage; correlates directly with surge immunity level per IEC 61000-4-5. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height; optimized for automated pick-and-place and thermal pad coupling. |
Pinout & Package
SMCJ45CA-M3/57T uses the standard SMC (DO-214AB) package: a two-terminal, bidirectional device with no polarity marking. Terminals are matte tin-plated leads compatible with J-STD-002 soldering processes. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated power derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically in bidirectional mode; no cathode band marking; current flows either direction during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Electrical symmetry ensures identical VBR, VC, and IPPM performance in both polarities-critical for AC line and differential signal protection. |
| 1500 W peak pulse power | Supports high-energy surge suppression per IEC 61000-4-5 Level 4 (4 kV/2 kA) when mounted on specified copper area. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes voltage overshoot during clamping, reducing stress on downstream MOSFETs, ICs, and sensors. |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance requirements for automotive and industrial end equipment without compromising surge robustness. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns-no baking required prior to SMT placement. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump transients (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed at power entry point upstream of DC/DC converters and microcontrollers. Use Value: Limits transient voltage to ≤72.7 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and power management ICs. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential or single-ended signal lines interfacing with ADC front-ends. Use Value: Maintains signal integrity below 72.7 V clamping while offering <1 ns response time to preserve fast edge fidelity. |
| Telecom Line Interface Protection | Consumer Equipment AC/DC Adapter Input |
Use Scenario: Safeguarding Ethernet PHY interfaces and PoE injectors from lightning-induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Primary-level TVS on data line pairs (e.g., TX+/TX−), coordinated with secondary GDT or polymer PTC. Use Value: Absorbs up to 1500 W of surge energy without degradation, preserving signal timing margins and jitter performance. |
Use Scenario: Overvoltage protection on secondary-side DC output of wall adapters powering USB peripherals and smart home devices. IC Role / Device Role / Timing Role: Final-stage clamp after rectification and filtering, guarding against capacitor failure or regulator fault conditions. Use Value: Prevents hazardous >45 V output excursions that could damage connected Li-ion batteries or USB controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA-M3/57T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM/VC ratings. | Reduced surge handling limits use to lower-energy applications (e.g., USB ports, low-power sensors). | Select when board space is constrained and surge threat level is ≤IEC 61000-4-5 Level 2. |
| SMCJ45A-M3/57T | Unidirectional version; includes cathode band marking; identical VWM, VC, and PPPM but asymmetric conduction. | Required only where DC-biased lines need polarity-specific clamping (e.g., 5 V supply rail with ground reference). | Choose only if circuit topology mandates unidirectional behavior; otherwise SMCJ45CA-M3/57T offers broader flexibility. |
Compared with SMBJ45CA-M3/57T and SMCJ45A-M3/57T, the SMCJ45CA-M3/57T delivers higher surge capacity in a bidirectional configuration-enabling single-device protection of AC-coupled or floating signal paths without polarity constraints or external biasing.
Availability
SMCJ45CA-M3/57T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O cards, telecom infrastructure power supplies, and consumer appliance mainboards requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ45CA-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 AEC-Q qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where failure resilience and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMCJ45CA-M3/57T at its rated peak pulse current?
The SMCJ45CA-M3/57T has a maximum clamping voltage (VC) of 72.7 V when subjected to its rated peak pulse current of 20.6 A under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and verified on the recommended 8.0 mm × 8.0 mm copper pad layout. The SMCJ45CA-M3/57T maintains this clamping performance symmetrically in both directions due to its bidirectional design.
Is SMCJ45CA-M3/57T qualified for automotive applications?
The base SMCJ45CA-M3/57T is halogen-free and RoHS-compliant but not AEC-Q101 qualified. However, Vishay offers the HM3 variant (e.g., SMCJ45CAHM3_A/H) which carries full AEC-Q101 qualification for automotive use. The SMCJ45CA-M3/57T shares identical electrical and thermal specifications with the HM3 version-only the qualification status and traceability documentation differ.
How does the SMCJ45CA-M3/57T differ from unidirectional SMCJ45A-M3/57T?
The SMCJ45CA-M3/57T is bidirectional with symmetrical breakdown and clamping in both polarities and no polarity marking, whereas the SMCJ45A-M3/57T is unidirectional with a visible cathode band and forward conduction capability. Both share identical VWM (45 V), VC (72.7 V), and PPPM (1500 W), but only the unidirectional version supports DC forward current (IFSM = 200 A). The SMCJ45CA-M3/57T is preferred for AC or floating signal lines.
What PCB layout guidance applies to SMCJ45CA-M3/57T for full 1500 W rating?
To achieve the full 1500 W peak pulse power rating, SMCJ45CA-M3/57T must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in Vishay's datasheet Figure 2 and thermal characterization. Smaller pads cause thermal derating; for example, at 25 °C ambient, derating begins above 25 °C per the published curve. The SMCJ45CA-M3/57T's RθJA = 75 °C/W assumes this layout.
Does SMCJ45CA-M3/57T have a specified junction capacitance?
No junction capacitance (CJ) value is specified for SMCJ45CA-M3/57T in the official Vishay datasheet (Document Number: 88394, Rev. 09-Jan-2024). Capacitance is provided only for unidirectional variants in Figure 4 (e.g., SMCJ45A shows ~150 pF at 0 V bias). As a bidirectional device, SMCJ45CA-M3/57T lacks published CJ data-designers should verify signal integrity impact empirically or select alternatives with documented capacitance if high-speed line protection is required.
SMCJ45CA-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):
- 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 (SMC)
SMCJ45CA-M3/57T FAQ
1.How can I place an order for SMCJ45CA-M3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45CA-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 SMCJ45CA-M3/57T reliable?
The price and inventory of SMCJ45CA-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 SMCJ45CA-M3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ45CA-M3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45CA-M3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45CA-M3/57T?
SMCJ45CA-M3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45CA-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 SMCJ45CA-M3/57T?
For technical support, including SMCJ45CA-M3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45CA-M3/57T requirements.
6.How does Aetrix verify that SMCJ45CA-M3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ45CA-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 SMCJ45CA-M3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ45CA-M3/57T?
All SMCJ45CA-M3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45CA-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 SMCJ45CA-M3/57T part is unused and in its original packaging.
Return procedure for SMCJ45CA-M3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45CA-M3/57T Tags
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