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Vishay General Semiconductor - Diodes Division SMCJ40A-E3/57T
- Part No.:
- SMCJ40A-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40A-E3/57T.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:10,182
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Product details
Overview
SMCJ40A-E3/57T from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for clamping voltage transients on power and signal lines. It features 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 1500 W peak pulse power (PPPM), and clamps to 64.5 V at 23.3 A surge current - used to protect MOSFETs, ICs, and sensor interfaces in automotive and industrial power supplies.
For engineers reviewing the SMCJ40A-E3/57T datasheet, SMCJ40A-E3/57T pinout, SMCJ40A-E3/57T application, or SMCJ40A-E3/57T equivalent, key selection criteria include unidirectional polarity, 1500 W surge rating with 10/1000 µs waveform, RoHS-compliant matte tin plating, MSL Level 1 moisture sensitivity, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ40A-E3/57T operates as a silicon avalanche diode that enters breakdown when reverse voltage exceeds its VBR range (44.4–49.1 V at 1 mA test current), limiting transient overvoltage to ≤64.5 V at 23.3 A. Its glass-passivated junction ensures stable clamping and low leakage (<1.0 µA at 40 V).
Thermally, it supports operation from –55 °C to +150 °C junction temperature, with RθJA = 75 °C/W and RθJL = 15 °C/W. It meets JESD201 Class 2 whisker resistance and is rated for 200 A non-repetitive forward surge (8.3 ms half-sine), making it suitable for high-energy inductive switching events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 44.4 V / 49.1 V at 1 mA - guaranteed avalanche initiation window under standardized test conditions |
| VC @ IPPM | 64.5 V at 23.3 A - clamped voltage during 1500 W 10/1000 µs transient, defining protection ceiling |
| PPPM | 1500 W - peak transient energy handling capability per single pulse, derated above 25 °C |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage ensures minimal standby power loss in protected circuits |
| TJ max | +150 °C - enables use in under-hood automotive and high-temperature industrial environments |
| Package | SMC (DO-214AB) - industry-standard surface-mount outline with 0.320" x 0.246" footprint and cathode band marking |
Pinout & Package
SMCJ40A-E3/57T uses the SMC (DO-214AB) package: molded plastic case with matte tin-plated leads, polarity indicated by a cathode band on the unidirectional device. Mounting requires 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased anode connection point | Connected to protected line; conducts during overvoltage to shunt current to ground |
| Anode | Reference/ground return path | Typically tied to system ground or low-impedance return plane to complete clamping loop |
Key Features
| Feature | Design Value |
|---|---|
| 1500 W peak pulse power | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on DC power rails |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT assembly without pre-baking or special handling |
| Glass-passivated junction | Ensures long-term stability of VBR and leakage across temperature and lifetime |
| AEC-Q101 qualification option | HE3/HM3 variants available for automotive-grade reliability; E3 suffix is commercial grade |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp spikes up to 1500 W. Use Value: Limits voltage to ≤64.5 V during 23.3 A surges, preventing damage to downstream regulators and microcontrollers. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS connected across differential or single-ended signal lines to suppress sub-100 ns transients. Use Value: Sub-µA leakage at 40 V preserves signal integrity; fast response prevents latch-up in precision front-end amplifiers. |
| DC Motor Drive Circuit Protection | Telecom Power Input Stage |
Use Scenario: Safeguarding H-bridge MOSFETs from inductive kickback during PWM commutation. IC Role / Device Role / Timing Role: Mounted across motor supply rail to absorb stored inductive energy. Use Value: 200 A surge rating handles repetitive 8.3 ms half-sine events; 1500 W PPPM sustains repeated switching stress. | Use Scenario: Front-end transient suppression on 48 V telecom rectifier outputs feeding PoE or baseband circuitry. IC Role / Device Role / Timing Role: Primary clamping device on DC input before DC/DC converters. Use Value: 64.5 V clamping voltage ensures safe margin below typical 75 V converter input ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/61 | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA) | Not suitable for >500 W surge requirements; limited to low-energy signal-line protection | Select only for space-constrained, low-power signal paths where 1500 W rating is unnecessary |
| SMCJ40CA-E3/57T | Bidirectional variant; same VWM/VBR/PPPM but symmetrical clamping in both polarities | Required for AC-coupled or floating lines (e.g., RS-485, CAN bus) where polarity reversal occurs | Choose when protecting bidirectional data lines or AC inputs; not interchangeable with unidirectional SMCJ40A-E3/57T |
Compared with SMAJ40A-E3/61 and SMCJ40CA-E3/57T, the SMCJ40A-E3/57T uniquely balances high-energy 1500 W clamping in a standard SMC footprint with unidirectional polarity - essential for cost-sensitive, high-reliability DC power rail protection where asymmetry is acceptable and surge magnitude demands full SMCJ-series capability.
Availability
SMCJ40A-E3/57T is available at Aetrix Electronics and suitable for automotive power systems, industrial motor drives, telecom power inputs, and sensor interface protection requiring stable component supply and RoHS-compliant manufacturing.
Supply support for SMCJ40A-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, efficiency, and application-specific optimization.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where failure resilience and repeatable clamping performance are critical.
FAQ
What is the clamping voltage of SMCJ40A-E3/57T at its rated peak pulse current?
The SMCJ40A-E3/57T clamps to a maximum of 64.5 V at its rated peak pulse current of 23.3 A (10/1000 µs waveform). This value is measured under standardized test conditions with the device mounted on 0.31" × 0.31" copper pads, and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ40A-E3/57T maintains this clamping performance across its specified operating temperature range.
Is SMCJ40A-E3/57T suitable for automotive applications?
The SMCJ40A-E3/57T is RoHS-compliant and rated for –55 °C to +150 °C operation, but it carries the E3 commercial-grade suffix - not AEC-Q101 qualified. For automotive applications requiring qualification, the HE3 variant (e.g., SMCJ40AHE3_A/H) must be selected. The SMCJ40A-E3/57T remains appropriate for non-safety-critical, under-dash industrial or aftermarket systems where full AEC-Q101 compliance is not mandated.
What is the meaning of the "/57T" suffix in SMCJ40A-E3/57T?
The "/57T" suffix in SMCJ40A-E3/57T indicates packaging: 7-inch diameter plastic tape-and-reel with 850 units per reel. The "57T" code is Vishay's preferred package code for this configuration, distinct from "9AT" (13-inch reel, 3500 units). This format supports automated SMT placement and is compatible with standard pick-and-place equipment using 8 mm carrier tape.
How does the SMCJ40A-E3/57T differ from the bidirectional SMCJ40CA-E3/57T?
The SMCJ40A-E3/57T is unidirectional with cathode-band polarity, while SMCJ40CA-E3/57T is bidirectional and lacks polarity marking. Both share identical VWM (40 V), VBR (44.4–49.1 V), PPPM (1500 W), and package, but the CA version clamps symmetrically in both directions - required for AC signals or floating lines. They are not pin-compatible replacements due to fundamental polarity architecture differences; the SMCJ40A-E3/57T cannot substitute for SMCJ40CA-E3/57T in bidirectional applications.
What is the maximum reverse leakage current of SMCJ40A-E3/57T at its standoff voltage?
The maximum reverse leakage current (ID) of SMCJ40A-E3/57T is 1.0 µA at its 40 V standoff voltage (VWM) and 25 °C ambient temperature. This ultra-low leakage ensures minimal power loss in always-on systems and avoids loading sensitive reference or bias networks. Leakage increases with temperature but remains within specification up to +150 °C junction temperature as defined in the Vishay datasheet 88394.
SMCJ40A-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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 23.3A
- 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)
SMCJ40A-E3/57T FAQ
1.How can I place an order for SMCJ40A-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40A-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 SMCJ40A-E3/57T reliable?
The price and inventory of SMCJ40A-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 SMCJ40A-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ40A-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40A-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40A-E3/57T?
SMCJ40A-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40A-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 SMCJ40A-E3/57T?
For technical support, including SMCJ40A-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40A-E3/57T requirements.
6.How does Aetrix verify that SMCJ40A-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ40A-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 SMCJ40A-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ40A-E3/57T?
All SMCJ40A-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40A-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 SMCJ40A-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ40A-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40A-E3/57T Tags
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