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Vishay General Semiconductor - Diodes Division SMCJ40-E3/57T
- Part No.:
- SMCJ40-E3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40-E3/57T.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,997
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Product details
Overview
SMCJ40-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 40 V stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC) at 23.3 A peak pulse current (IPPM), and 1500 W peak pulse power dissipation (PPPM) under 10/1000 µs waveform - deployed in automotive ECUs, industrial PLC I/O modules, and telecom power supplies.
For engineers reviewing the SMCJ40-E3/57T datasheet, SMCJ40-E3/57T pinout, SMCJ40-E3/57T application, or SMCJ40-E3/57T equivalent, key selection criteria include verified clamping performance at rated surge current, AEC-Q101 qualification status, RoHS compliance with JESD 201 Class 1A whisker resistance, thermal resistance (RθJA = 75 °C/W), and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ40-E3/57T operates as a silicon avalanche diode with glass-passivated junction, delivering sub-nanosecond response to transients. Its unidirectional polarity uses a cathode band marking, and it sustains 200 A non-repetitive forward surge current (IFSM) per 8.3 ms half-sine wave - critical for load-dump immunity in 12 V automotive systems.
Thermal design relies on RθJL = 15 °C/W (junction-to-lead) and derating above TA = 25 °C per Fig. 2; operation is validated across -55 °C to +150 °C junction temperature range. The device meets UL 497B recognition (QVGQ2) and MSL Level 1 per J-STD-020 at 260 °C peak reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 36–42 V nominal systems. |
| VBR min/max | 44.4 V / 49.1 V at IT = 1 mA - Verified breakdown threshold ensures predictable turn-on during fast transients. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamping voltage limits downstream IC stress during 10/1000 µs surges (e.g., ISO 7637-2 Pulse 1/2/5a). |
| PPPM | 1500 W - Peak surge power handling capacity under standardized waveform; enables single-device protection for moderate-energy transients. |
| ID @ VWM | 1.0 µA - Ultra-low leakage preserves battery life in always-on circuits and avoids false triggering. |
| TJ max | +150 °C - Enables deployment in under-hood automotive environments and high-ambient industrial enclosures. |
| RθJA | 75 °C/W - Thermal resistance value used to calculate junction temperature rise under steady-state power dissipation (PD = 6.5 W). |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by molded band; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / transient return path | Connected to protected line (e.g., +12 V rail); conducts during positive surges when cathode is biased higher. |
| Cathode | Reverse-biased terminal / clamping reference | Connected to ground or lower-potential reference; avalanche conduction initiates here during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Glass-passivated junction | Enhances long-term stability and moisture resistance versus epoxy-passivated alternatives, critical for harsh-environment deployments. |
| JESD 201 Class 1A whisker resistance | Prevents tin whisker growth under thermal stress, eliminating latent short-circuit risk in high-reliability PCB assemblies. |
| UL 497B recognized (QVGQ2) | Confirms compliance with telecom and industrial surge protector safety standards - simplifies end-equipment certification. |
| MSL Level 1 (260 °C peak) | Enables standard lead-free reflow without preconditioning; supports high-yield automated assembly in commercial and automotive production lines. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply inputs in engine control units against load dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary clamping element placed between battery feed and DC/DC converter input. Use Value: Limits transient voltage to ≤64.5 V, preventing damage to downstream 40 V-rated MOSFETs and LDOs while surviving 200 A surge peaks. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in factory automation I/O modules from ESD and inductive switching noise. IC Role / Device Role / Timing Role: Low-capacitance TVS placed directly at connector interface before signal conditioning circuitry. Use Value: Sub-nanosecond response and 1.0 µA leakage preserve signal integrity and system standby current in 24 V industrial networks. |
| Telecom DC Power Input Protection | Consumer Power Adapter Output Clamping |
Use Scenario: Safeguarding PoE-powered equipment (e.g., IP cameras, access points) from lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of DC/DC isolation stage and Ethernet PHY power domain. Use Value: 1500 W PPPM rating handles multi-kV induced surges; UL 497B recognition satisfies safety agency requirements for telecom infrastructure. | Use Scenario: Preventing output overvoltage in wall-mounted AC/DC adapters due to feedback loop failure or rectifier short. IC Role / Device Role / Timing Role: Secondary-side clamp across regulated 5 V or 12 V output, triggered only during fault conditions. Use Value: 40 V VWM aligns with typical adapter output tolerances; 64.5 V VC ensures connected USB peripherals remain within absolute maximum ratings. |
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. | Reduced surge energy handling; suitable only for low-energy signal-line protection, not power rail duty. | Select when board space is constrained and surge threat level is limited to IEC 61000-4-2 ESD or low-current inductive spikes. |
| SMCJ40AHE3/57T | Identical electrical specs but AEC-Q101 qualified (HE3 suffix); same DO-214AB package and marking. | Approved for automotive use; requires full qualification documentation and traceability for OEM programs. | Choose for automotive designs requiring certified reliability; SMCJ40-E3/57T remains valid for industrial/commercial applications where AEC-Q101 is not mandated. |
Compared with SMBJ40A-E3/52T, the SMCJ40-E3/57T delivers 2.5× higher surge power handling and superior thermal dissipation via larger pad layout; versus SMCJ40AHE3/57T, it offers identical protection performance at lower cost and documentation burden for non-automotive use cases.
Availability
SMCJ40-E3/57T is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC I/O modules, and telecom DC power inputs requiring stable component supply with consistent RoHS-compliant manufacturing and tape-and-reel delivery.
Supply support for SMCJ40-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, and protection devices with emphasis on reliability, precision, and application-specific validation.
The SMCJ series belongs to Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in automotive, industrial, and telecom infrastructure where robustness and repeatable clamping performance are mandatory.
FAQ
What is the clamping voltage of the SMCJ40-E3/57T under standard test conditions?
The SMCJ40-E3/57T has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 23.3 A using a 10/1000 µs waveform. This value is measured at the device terminals under defined thermal conditions (TA = 25 °C, mounted on 8.0 mm × 8.0 mm copper pads) and represents the upper voltage limit imposed on protected circuitry during surge events. The SMCJ40-E3/57T maintains this clamping performance consistently across its operational temperature range.
Is the SMCJ40-E3/57T suitable for automotive applications?
The SMCJ40-E3/57T is RoHS-compliant and manufactured to commercial-grade specifications (E3 suffix), but it is not AEC-Q101 qualified. For automotive applications requiring formal qualification, the functionally identical SMCJ40AHE3/57T (HE3 suffix) must be used. The SMCJ40-E3/57T remains appropriate for non-safety-critical automotive subsystems where qualification is not mandated, such as aftermarket infotainment or lighting modules - however, full compliance requires verification against OEM-specific requirements. Always confirm with the vehicle manufacturer's component approval list.
What does the "E3/57T" suffix indicate in SMCJ40-E3/57T?
The "E3" suffix denotes RoHS-compliant construction with matte tin-plated leads meeting JESD 201 Class 1A whisker resistance, while "57T" specifies packaging in 7-inch diameter plastic tape and reel containing 850 units. This ordering code ensures traceable, automated-assembly-ready delivery aligned with IPC-J-STD-020 moisture sensitivity Level 1 (peak reflow temperature 260 °C). The SMCJ40-E3/57T is not compatible with alternate reels like 9AT (3500-unit 13-inch reel) without order modification.
How does the SMCJ40-E3/57T compare to bi-directional TVS diodes like SMCJ40CA?
The SMCJ40-E3/57T is unidirectional and features a cathode band for polarity-sensitive placement, whereas SMCJ40CA is bi-directional with no polarity marking and symmetrical clamping in both directions. The SMCJ40-E3/57T offers lower leakage (1.0 µA vs. 10 µA for SMCJ40CA at VWM) and is preferred for DC power rail protection where reverse voltage is not expected. In contrast, SMCJ40CA suits AC-coupled signal lines or bidirectional data buses. Both share identical VWM, VC, and PPPM ratings, but their circuit integration and layout constraints differ fundamentally.
What thermal considerations apply when using the SMCJ40-E3/57T in high-temperature environments?
The SMCJ40-E3/57T has a maximum junction temperature (TJ max) of +150 °C and thermal resistance RθJA = 75 °C/W under standard mounting conditions (0.31″ × 0.31″ copper pads). At ambient temperatures above 25 °C, its peak pulse power rating must be derated per Figure 2 in the datasheet - e.g., at TA = 85 °C, PPPM drops to ~1050 W. To maintain reliability, ensure adequate copper area and avoid enclosing the SMCJ40-E3/57T in thermally restrictive enclosures; for sustained high-TA operation, verify junction temperature using RθJL = 15 °C/W and actual power dissipation.
SMCJ40-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):
- 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-E3/57T FAQ
1.How can I place an order for SMCJ40-E3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40-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 SMCJ40-E3/57T reliable?
The price and inventory of SMCJ40-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 SMCJ40-E3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ40-E3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40-E3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40-E3/57T?
SMCJ40-E3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40-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 SMCJ40-E3/57T?
For technical support, including SMCJ40-E3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40-E3/57T requirements.
6.How does Aetrix verify that SMCJ40-E3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ40-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 SMCJ40-E3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ40-E3/57T?
All SMCJ40-E3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40-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 SMCJ40-E3/57T part is unused and in its original packaging.
Return procedure for SMCJ40-E3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40-E3/57T Tags
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