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Vishay General Semiconductor - Diodes Division SMCJ45A-E3/57T
- Part No.:
- SMCJ45A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ45A-E3/57T.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,442
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Product details
Overview
SMCJ45A-E3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 45 V standoff voltage (VWM), 50.0–55.3 V breakdown range (VBR at 1 mA), 72.7 V maximum clamping voltage (VC) at 20.6 A peak pulse current, and 1500 W peak pulse power rating with a 10/1000 µs waveform. It is used to protect MOSFETs, ICs, and sensor interfaces against inductive switching transients and ESD in automotive and industrial control systems.
For engineers reviewing the SMCJ45A-E3/57T datasheet, SMCJ45A-E3/57T pinout, SMCJ45A-E3/57T application, or SMCJ45A-E3/57T equivalent, key selection criteria include clamping performance under 20.6 A surge, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, RoHS-compliant matte tin plating, and compatibility with automated SMT placement on standard SMC (DO-214AB) footprints.
Technical Context
The SMCJ45A-E3/57T operates as a silicon avalanche diode that remains non-conductive below 45 V and rapidly clamps transients above its breakdown threshold. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of lightning-induced surges and inductive kickback without affecting normal circuit operation.
It is rated for -55 °C to +150 °C junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and supports bidirectional variants via CA suffix - though SMCJ45A-E3/57T itself is strictly unidirectional with cathode band identification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC rail margin. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown onset range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 72.7 V at 20.6 A - Clamped voltage under full 1500 W surge; determines protected circuit's maximum stress level. |
| PPPM | 1500 W - Peak pulse power handling with 10/1000 µs waveform; validates suitability for high-energy transients. |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance on standard 8 mm × 8 mm copper pads; guides heatsinking requirements. |
| TJ max. | +150 °C - Maximum allowable junction temperature; enables use in under-hood automotive environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 0.320" body length; compatible with IPC-7351B SMC footprint. |
Pinout & Package
SMCJ45A-E3/57T uses the SMC (DO-214AB) package: a molded, rectangular surface-mount case with two coplanar leads, matte tin-plated for solderability per J-STD-002. Polarity is marked by a cathode band on the body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional TVS configuration. |
| Cathode | Reverse-biased terminal | Marked with band; connected to protected line (e.g., 45 V supply rail); conducts during overvoltage clamp. |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable avalanche characteristics and long-term reliability under repeated surge stress. |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for downstream ICs. |
| MSL Level 1 rating | Supports single-reflow assembly without moisture sensitivity concerns; no baking required pre-SMT. |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive-grade deployment; SMCJ45A-E3/57T is commercial grade but shares same die and construction. |
| UL 497B recognition | Validated for telecom and industrial surge protector classification (QVGQ2, file E136766), easing system-level certification. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 48 V battery-connected ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp spikes up to 1500 W. Use Value: Limits voltage seen by downstream DC-DC converters to ≤72.7 V, preventing latch-up or gate oxide damage. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in PLC modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Low-capacitance TVS on 4–20 mA or 0–10 V signal paths to suppress EFT and surge without distorting signal integrity. Use Value: Maintains <1 µA leakage at 45 V, avoiding offset errors while clamping >1 kV transients within nanoseconds. |
| Telecom Line Card Surge Suppression | Consumer Appliance Motor Drive Protection |
Use Scenario: Front-end protection for Ethernet PHY power supplies and bias rails in outdoor base station line cards. IC Role / Device Role / Timing Role: Standoff-rated TVS on 3.3 V/5 V auxiliary rails to absorb lightning-induced common-mode surges coupled via transformers. Use Value: Withstands 20.6 A peak current and recovers fully post-surge, enabling compliance with ITU-T K.21 basic protection level. | Use Scenario: Snubbing back-EMF from brushed DC motors in smart home appliances (e.g., vacuum cleaners, blenders). IC Role / Device Role / Timing Role: Unidirectional TVS across motor terminals or H-bridge supply rails to absorb inductive energy during PWM commutation. Use Value: Fast <1 ns response prevents MOSFET avalanche failure; 1500 W rating handles repetitive 8.3 ms half-sine surges up to 200 A IFSM. |
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 | Same VWM/VBR/VC, but 600 W PPPM and SMB (DO-214AA) package (smaller footprint, higher RθJA). | Limited to lower-energy transients; suitable where board space is constrained and surge risk is moderate. | Select when PCB area is critical and peak surge exposure does not exceed 600 W. |
| SMCJ45CA-E3/57T | Bidirectional variant with identical VWM/VBR/VC ratings but symmetrical clamping in both polarities; no cathode band. | Required for AC-coupled or floating signal lines where polarity reversal may occur (e.g., RS-485, CAN bus). | Choose only if bidirectional protection is mandated by signal architecture - not a drop-in replacement for unidirectional use. |
Compared with SMBJ45A-E3/52T, SMCJ45A-E3/57T delivers 2.5× higher surge power handling in a slightly larger SMC package; versus SMCJ45CA-E3/57T, it offers optimized unidirectional clamping with cathode identification, making it preferable for fixed-polarity DC rails where cost and layout simplicity are priorities.
Availability
SMCJ45A-E3/57T is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface protection, and telecom line card surge suppression requiring stable component supply, consistent lead-free plating, and traceable lot control.
Supply support for SMCJ45A-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, ruggedness, and application-specific validation.
The SMCJ series was developed for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where sustained surge immunity and thermal stability are mission-critical.
FAQ
What is the maximum clamping voltage of the SMCJ45A-E3/57T under full-rated surge current?
The SMCJ45A-E3/57T has a maximum clamping voltage (VC) of 72.7 V when subjected to its peak pulse current (IPPM) of 20.6 A using a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on the protected circuit during worst-case transient events. The SMCJ45A-E3/57T maintains this clamping performance across its specified operating temperature range.
Is the SMCJ45A-E3/57T suitable for automotive applications requiring AEC-Q101 qualification?
The SMCJ45A-E3/57T is RoHS-compliant commercial-grade with E3 suffix and is not AEC-Q101 qualified. However, Vishay offers the functionally identical SMCJ45A-HE3_X variant (e.g., SMCJ45AHE3_A) which carries AEC-Q101 qualification. For automotive designs requiring certified components, SMCJ45A-E3/57T must be replaced with an HE3 or HM3 suffix part - the SMCJ45A-E3/57T itself is intended for industrial and consumer applications.
How does the SMCJ45A-E3/57T differ from the bidirectional SMCJ45CA-E3/57T?
The SMCJ45A-E3/57T is unidirectional with cathode band marking and conducts only in reverse bias, while the SMCJ45CA-E3/57T is bidirectional with symmetrical breakdown in both directions and no polarity marking. Their VWM, VBR, and VC values are identical, but SMCJ45A-E3/57T cannot replace SMCJ45CA-E3/57T in AC or floating circuits without redesign. The SMCJ45A-E3/57T is optimized for fixed-polarity DC protection.
What is the thermal resistance and recommended pad layout for optimal power dissipation of the SMCJ45A-E3/57T?
The SMCJ45A-E3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, as specified in the Vishay datasheet. To achieve this rating, the PCB must use minimum recommended SMC (DO-214AB) pad dimensions with adequate copper pour and thermal vias - reducing RθJA improves surge repetition capability and long-term reliability of the SMCJ45A-E3/57T.
Can the SMCJ45A-E3/57T be used in place of older P6KE45A or 1.5KE45A through-hole TVS diodes?
The SMCJ45A-E3/57T provides equivalent electrical performance (VWM = 45 V, VC = 72.7 V, PPPM = 1500 W) to P6KE45A and 1.5KE45A but in a surface-mount SMC package. It is not a direct mechanical replacement due to different footprint and soldering process - redesign is required for pad layout and reflow profile. However, the SMCJ45A-E3/57T offers superior surge robustness, tighter parameter distribution, and automated assembly compatibility over legacy axial/DO-204AC packages.
SMCJ45A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMCJ45A-E3/57T FAQ
1.How can I place an order for SMCJ45A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ45A-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 SMCJ45A-E3/57T reliable?
The price and inventory of SMCJ45A-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 SMCJ45A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ45A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ45A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ45A-E3/57T?
SMCJ45A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ45A-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 SMCJ45A-E3/57T?
For technical support, including SMCJ45A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ45A-E3/57T requirements.
6.How does Aetrix verify that SMCJ45A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ45A-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 SMCJ45A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ45A-E3/57T?
All SMCJ45A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ45A-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 SMCJ45A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ45A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ45A-E3/57T Tags
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