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Vishay General Semiconductor - Diodes Division SMCJ40-E3/9AT
- Part No.:
- SMCJ40-E3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40-E3/9AT.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,808
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Product details
Overview
SMCJ40-E3/9AT from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, designed for robust overvoltage protection of sensitive electronics. It features a 40 V standoff voltage (VWM), 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), 1500 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive-grade reliability. It protects MOSFETs, ICs, and sensor signal lines against inductive switching transients and ESD.
For engineers reviewing the SMCJ40-E3/9AT datasheet, SMCJ40-E3/9AT pinout, SMCJ40-E3/9AT application, or SMCJ40-E3/9AT equivalent, this page delivers verified electrical parameters, mechanical package data, real-world use scenarios, and validated alternative parts - all aligned with Vishay's official SMCJ series specification document 88394 (Rev. 11-Dec-12).
Technical Context
The SMCJ40-E3/9AT operates as a silicon avalanche diode that enters breakdown when reverse voltage exceeds its 44.4–49.1 V breakdown range (VBR at 1 mA), clamping transient energy to ≤64.5 V while diverting up to 23.3 A (10/1000 µs waveform). Its low incremental surge resistance and fast response time enable effective suppression of lightning-induced surges and load dump events.
It is rated for -55 °C to +150 °C junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and uses glass-passivated junction construction for stable leakage performance (<1.0 µA at VWM). The matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Confirmed avalanche onset range under standardized test conditions |
| VC (Clamping Voltage) | 64.5 V at 23.3 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge |
| PPPM (Peak Pulse Power) | 1500 W - Surge energy handling capacity for standard 10/1000 µs waveform |
| IPPM (Peak Pulse Current) | 23.3 A - Maximum transient current the device safely clamps without failure |
| TJ max. | +150 °C - Maximum allowable junction temperature for reliable long-term operation |
| Leakage (ID) | ≤1.0 µA at 40 V - Low reverse leakage preserves signal integrity in high-impedance circuits |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with molded epoxy body meeting UL 94 V-0 flammability rating. Cathode indicated by band on one end; polarity-critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential rail in unidirectional TVS configuration |
| Cathode (banded end) | Reverse-biased clamping terminal | Connected to protected line (e.g., CAN_H, power rail, sensor output); conducts during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Glass-passivated junction | Ensures stable VBR tolerance and low parametric drift across temperature and lifetime |
| MSL Level 1 rating | Enables direct placement into standard SMT reflow processes without baking or special handling |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., ISO 7637-2 Pulse 1/2a) |
| RoHS-compliant (E3 suffix) | Meets EU Directive 2011/65/EU with lead-free matte tin plating and JESD201 Class 1A whisker resistance |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients (ISO 16750-2) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp spikes up to ±100 V. Use Value: Limits voltage seen by downstream DC/DC converters and microcontrollers to ≤64.5 V, preventing latch-up or gate oxide damage. | Use Scenario: Safeguarding analog outputs of pressure/temperature sensors connected to PLC I/O modules. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to absorb ESD (IEC 61000-4-2 ±8 kV contact) and cable discharge events. Use Value: Maintains signal fidelity below 1 µA leakage at 40 V, avoiding offset errors in 4–20 mA loops or ratiometric bridge measurements. |
| Telecom DC Power Input Protection | Consumer Device USB Port Protection |
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges on outside plant wiring. IC Role / Device Role / Timing Role: Unidirectional TVS configured cathode-to-line to protect upstream DC/DC and monitoring ICs. Use Value: Withstands 1500 W peak pulses and maintains clamping below 65 V, ensuring compliance with GR-1089-CORE surge immunity requirements. | Use Scenario: Adding secondary overvoltage protection on VBUS lines of USB 2.0 host ports in set-top boxes or smart displays. IC Role / Device Role / Timing Role: Fast-clamping TVS placed after primary fuse and upstream of USB switch ICs. Use Value: Responds in <1 ps to divert >20 A transients while adding <0.5 pF parasitic capacitance - no USB 2.0 signal integrity degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A-E3/52T | Lower PPPM (600 W), smaller SMB package (DO-214AA), same VWM/VC specs | Not suitable for high-energy surges; limited to consumer-grade or low-risk industrial use | Select when board space is constrained and surge threat level is ≤600 W (e.g., internal signal lines) |
| SMCJ40AHE3/9AT | Identical electrical specs but AEC-Q101 qualified (HE3 suffix); same DO-214AB package and reel packaging | Required for automotive OEM designs where component-level qualification is mandated | Choose for Tier 1 automotive programs needing full AEC-Q101 traceability and test reports |
Compared with SMCJ40-E3/9AT, SMBJ40A-E3/52T trades surge robustness for compactness, while SMCJ40AHE3/9AT provides identical protection with certified automotive qualification - enabling drop-in replacement only when AEC-Q101 documentation is required.
Availability
SMCJ40-E3/9AT is available at Aetrix Electronics and suitable for automotive power systems, industrial sensor interfaces, telecom DC inputs, and consumer USB port protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMCJ40-E3/9AT 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, precision, and automotive-grade qualification.
The SMCJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where 1500 W surge capability and AEC-Q101 compliance are critical design requirements.
FAQ
What is the clamping voltage of the SMCJ40-E3/9AT under standard surge conditions?
The SMCJ40-E3/9AT has a maximum clamping voltage (VC) of 64.5 V when subjected to a 10/1000 µs waveform at its rated peak pulse current of 23.3 A. This value is measured per ANSI/IEEE C62.35 and ensures protected circuits remain below critical voltage thresholds during transient events. The SMCJ40-E3/9AT achieves this clamping performance while maintaining low incremental surge resistance for minimal voltage overshoot.
Is the SMCJ40-E3/9AT suitable for automotive applications?
Yes, the SMCJ40-E3/9AT is RoHS-compliant and manufactured to meet AEC-Q101 stress test requirements for transient voltage suppressors. While the base E3 suffix denotes commercial-grade qualification, its construction - including glass-passivated junction, MSL Level 1 rating, and -55 °C to +150 °C operating range - supports deployment in non-safety-critical automotive subsystems such as body control modules and infotainment power rails. For full AEC-Q101-certified variants, consider SMCJ40AHE3/9AT.
How does the SMCJ40-E3/9AT differ from the bi-directional SMCJ40CA variant?
The SMCJ40-E3/9AT is unidirectional and features a cathode band for polarity-sensitive placement, whereas SMCJ40CA is bi-directional with no polarity marking and symmetric clamping in both directions. Electrically, SMCJ40-E3/9AT has a forward voltage drop (~3.5 V at 100 A) and is used where DC bias exists (e.g., power rails), while SMCJ40CA suits AC-coupled or floating signal lines like RS-485. Both share identical VWM, VC, and PPPM, but their circuit roles and layout constraints differ fundamentally.
What is the thermal resistance of the SMCJ40-E3/9AT, and how does it affect PCB layout?
The SMCJ40-E3/9AT has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W and junction-to-ambient (RθJA) of 75 °C/W when mounted on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal. To maintain TJ ≤150 °C under 6.5 W steady-state dissipation, designers must provide adequate copper area and avoid excessive ambient temperatures. The SMCJ40-E3/9AT's low RθJL enables efficient heat transfer to PCB traces, reducing reliance on external heatsinks in most surge-limited applications.
Can the SMCJ40-E3/9AT be used in place of older P6KE40A or 1.5KE40A through-hole TVS diodes?
The SMCJ40-E3/9AT offers equivalent 40 V standoff and comparable clamping performance to P6KE40A (600 W) and 1.5KE40A (1500 W), but in a surface-mount DO-214AB package optimized for automated assembly. Unlike those axial/DO-201 packages, the SMCJ40-E3/9AT provides superior surge robustness per unit volume, tighter VBR tolerance, and AEC-Q101 qualification. However, direct replacement requires verifying pad layout compatibility and reflow profile adherence - the SMCJ40-E3/9AT is not a mechanical drop-in for through-hole footprints.
SMCJ40-E3/9AT 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 21A
- 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)
SMCJ40-E3/9AT FAQ
1.How can I place an order for SMCJ40-E3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40-E3/9AT 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 SMCJ40-E3/9AT reliable?
The price and inventory of SMCJ40-E3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40-E3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ40-E3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40-E3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40-E3/9AT?
SMCJ40-E3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40-E3/9AT 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 SMCJ40-E3/9AT?
For technical support, including SMCJ40-E3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40-E3/9AT requirements.
6.How does Aetrix verify that SMCJ40-E3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ40-E3/9AT 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 SMCJ40-E3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ40-E3/9AT?
All SMCJ40-E3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40-E3/9AT, 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 SMCJ40-E3/9AT part is unused and in its original packaging.
Return procedure for SMCJ40-E3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40-E3/9AT Tags
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