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Vishay General Semiconductor - Diodes Division SMCJ45-E3/57T
- Part No.:
- SMCJ45-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45-E3/57T.pdf
- Description:
- TVS DIODE 45VWM 80.3VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:9,737
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Product details
Overview
SMCJ45-E3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown voltage (VBR), 72.7 V clamping voltage (VC) at 20.6 A peak pulse current (IPPM), and 1500 W peak pulse power (PPPM) capability with <1 ns response time.
For engineers reviewing the SMCJ45-E3/57T datasheet, SMCJ45-E3/57T pinout, SMCJ45-E3/57T application, or SMCJ45-E3/57T equivalent, key selection criteria include clamping performance under 10/1000 µs surge, thermal resistance (RθJA = 75 °C/W), AEC-Q101 qualification status, RoHS compliance (E3 suffix), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ45-E3/57T operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range (50.0–55.3 V at 1 mA test current). Its low incremental surge resistance and fast response enable effective suppression of ESD, lightning-induced transients, and inductive switching spikes on automotive and industrial power inputs.
Designed for surface-mount use in DO-214AB, it delivers 1500 W peak pulse power handling per 10/1000 µs waveform, derated linearly above 25 °C ambient, with maximum junction temperature of 150 °C and storage range from –55 °C to +150 °C. The device meets MSL Level 1 and JESD201 Class 1A whisker testing requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - Confirmed avalanche onset range under standardized test conditions |
| VC @ IPPM | 72.7 V at 20.6 A - Clamped voltage during full 1500 W surge, limiting downstream stress |
| PPPM | 1500 W - Peak transient energy absorption capability per 10/1000 µs waveform |
| RθJA | 75 °C/W - Thermal resistance from junction to ambient, defining heatsinking requirements |
| TJ max | +150 °C - Absolute maximum junction temperature for reliable long-term operation |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability per stress test standard |
Pinout & Package
Package: DO-214AB (SMCJ), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, footprint compatible with industry-standard SMC layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Marked with band; connects to protected line (e.g., 45 V rail); conducts during overvoltage event |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable breakdown characteristics and long-term reliability under repeated surge stress |
| Low profile DO-214AB package | Enables high-density PCB layouts and compatibility with automated pick-and-place equipment |
| AEC-Q101 qualification | Validates suitability for automotive power supply and sensor interface applications requiring extended temperature and life-cycle validation |
| JESD201 Class 1A whisker resistance | Prevents tin whisker growth under thermal cycling, critical for mission-critical automotive and industrial systems |
| 1500 W peak pulse rating | Provides margin against IEC 61000-4-5 Level 4 (4 kV) surges without degradation |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges exceeding 45 V. Use Value: Limits transient voltage to ≤72.7 V during 20.6 A 10/1000 µs events, preventing damage to downstream PMICs and microcontrollers. | Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: TVS connected across signal and ground to absorb ESD and cable discharge events. Use Value: Sub-1 ns response ensures clamping occurs before sensitive ADC front-ends are exposed to >1 kV HBM-level transients. |
| Telecom DC Power Input | Consumer Power Adapter Output |
Use Scenario: Secondary-side overvoltage protection on 48 V PoE+ power sourcing equipment outputs. IC Role / Device Role / Timing Role: Unidirectional suppressor installed at PSE port to limit fault voltage during cable short-circuit recovery. Use Value: 1500 W PPPM rating sustains multiple 10/1000 µs surges without parametric shift, supporting IEEE 802.3bt compliance. | Use Scenario: Output rail protection in USB-C PD 45 W adapters where 20 V nominal becomes 45 V during fault conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS placed after secondary rectifier to prevent overvoltage propagation to connected devices. Use Value: 45 V VWM aligns precisely with adapter's overvoltage lockout threshold, enabling coordinated system-level protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A-E3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VBR/VC specs | Suitable for space-constrained consumer designs with lower surge exposure | Select when board area is limited and IEC 61000-4-5 Level 3 (2 kV) is sufficient |
| SMCJ45AHE3/57T | Identical electrical specs but AEC-Q101 qualified (HE3 suffix vs. E3), same DO-214AB package | Required for automotive OEM production where component-level qualification is mandated | Choose for automotive applications needing documented AEC-Q101 compliance beyond standard E3 grade |
Compared with SMCJ45-E3/57T, SMBJ45A-E3/52T trades 60% lower surge capacity for 30% smaller footprint, while SMCJ45AHE3/57T provides identical protection performance with formal automotive qualification-making it the drop-in replacement where AEC-Q101 documentation is contractually required.
Availability
SMCJ45-E3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface circuits, and telecom DC input stages requiring stable component supply with consistent surge performance and RoHS compliance.
Supply support for SMCJ45-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMCJ series belongs to Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of the SMCJ45-E3/57T under maximum surge conditions?
The SMCJ45-E3/57T has a maximum clamping voltage (VC) of 72.7 V at 20.6 A peak pulse current (IPPM), measured using the standard 10/1000 µs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during a full 1500 W transient event, ensuring downstream ICs remain within safe operating limits. The SMCJ45-E3/57T maintains this clamping performance across its qualified temperature range.
Is the SMCJ45-E3/57T suitable for automotive applications?
Yes, the SMCJ45-E3/57T is RoHS-compliant and manufactured with JESD201 Class 1A whisker-resistant terminations, but it is not AEC-Q101 qualified. For automotive production, the functionally identical SMCJ45AHE3/57T (HE3 suffix) should be used instead. The SMCJ45-E3/57T remains appropriate for non-safety-critical automotive prototypes or aftermarket modules where formal qualification is not mandated. Always verify system-level compliance requirements before selecting the SMCJ45-E3/57T.
How does the SMCJ45-E3/57T differ from the bi-directional SMCJ45CA variant?
The SMCJ45-E3/57T is unidirectional, meaning it conducts only in reverse bias above its breakdown voltage and blocks forward current like a standard diode. In contrast, the SMCJ45CA is bi-directional with symmetrical clamping in both polarities-suitable for AC lines or differential signal pairs. The SMCJ45-E3/57T offers lower leakage at VWM (1.0 µA vs. up to 2.0 µA for CA types) and supports higher forward surge current (IFSM = 200 A), making it optimal for DC rail protection where polarity is fixed.
What PCB pad layout is recommended for optimal thermal performance of the SMCJ45-E3/57T?
Vishay specifies a minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pad area per terminal for the SMCJ45-E3/57T to achieve rated 1500 W pulse power and maintain RθJA ≤ 75 °C/W. These pads must be connected to internal ground/power planes via multiple thermal vias. Deviating from this layout reduces surge capability and risks junction overheating during repetitive transients. The SMCJ45-E3/57T datasheet Figure 2 provides derating curves for alternative pad sizes.
Does the SMCJ45-E3/57T meet any international safety or flammability standards?
Yes, the SMCJ45-E3/57T's DO-214AB molding compound meets UL 94 V-0 flammability rating, and the device carries Underwriters Laboratories recognition (QVGQ2) under UL 497B for protector classification, with file number E136766. It is also compliant with RoHS Directive 2011/65/EU (E3 suffix). These certifications confirm suitability for end-equipment requiring certified surge protection components in commercial, industrial, and telecom applications.
SMCJ45-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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 80.3V
- Current - Peak Pulse (10/1000µs):
- 18.7A
- 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)
SMCJ45-E3/57T FAQ
1.How can I place an order for SMCJ45-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45-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 SMCJ45-E3/57T reliable?
The price and inventory of SMCJ45-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 SMCJ45-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ45-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45-E3/57T?
SMCJ45-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45-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 SMCJ45-E3/57T?
For technical support, including SMCJ45-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45-E3/57T requirements.
6.How does Aetrix verify that SMCJ45-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ45-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 SMCJ45-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ45-E3/57T?
All SMCJ45-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45-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 SMCJ45-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ45-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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