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Vishay General Semiconductor - Diodes Division SMCJ40HE3/57T
- Part No.:
- SMCJ40HE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40HE3/57T.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,237
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Product details
Overview
SMCJ40HE3/57T from Vishay General Semiconductor is a surface-mount, AEC-Q101-qualified, bi-directional transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package. It features 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 (PPPM) with 10/1000 μs waveform - designed for robust overvoltage protection of automotive sensor signal lines, CAN transceivers, and power supply rails.
For engineers reviewing the SMCJ40HE3/57T datasheet, SMCJ40HE3/57T pinout, SMCJ40HE3/57T application, or SMCJ40HE3/57T equivalent, key selection criteria include its bi-directional clamping behavior, AEC-Q101 qualification, 1500 W surge capability, low 1.0 μA max reverse leakage at VWM, and compatibility with automated SMT assembly on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ40HE3/57T operates as a bi-directional avalanche diode, exhibiting symmetrical breakdown characteristics in both polarities with minimum breakdown voltage (VBR) of 44.4 V and maximum of 49.1 V at 1.0 mA test current. Its clamping action limits transient-induced voltage excursions to ≤64.5 V under 23.3 A 10/1000 μs surge, enabling reliable protection of downstream 3.3 V/5 V logic interfaces without latch-up risk.
Thermally, it sustains junction temperatures from −55 °C to +150 °C, with typical thermal resistance of 75 °C/W (junction-to-ambient, on recommended pad layout) and 15 °C/W (junction-to-lead). The device meets MSL Level 1 per J-STD-020 and is RoHS-compliant with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working margin for protected circuitry. |
| VBR min / max | 44.4 V / 49.1 V at 1.0 mA - Ensures predictable, repeatable avalanche onset across production lots and temperature range. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamped voltage during worst-case 10/1000 μs surge; must remain below IC absolute maximum ratings. |
| PPPM | 1500 W - Peak transient energy handling capacity; supports ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 compliance. |
| ID @ VWM | ≤1.0 μA - Ultra-low leakage preserves signal integrity and battery life in always-on automotive modules. |
| TJ range | −55 °C to +150 °C - Enables deployment in engine bay, transmission control units, and other high-temperature automotive zones. |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including HTOL, TCT, and ESD testing per stress test plan. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, bi-directional configuration with no polarity marking (unlike uni-directional variants which feature cathode band).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Bi-directional terminals conduct equally in either polarity during overvoltage events; no cathode band marking required. |
| Case (cathode side in uni-dir) | Thermal and mechanical interface | DO-214AB body provides low-inductance path and thermal dissipation via soldered copper pads (8.0 mm × 8.0 mm recommended). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including powertrain, ADAS, and body control modules requiring long-term field reliability. |
| 1500 W peak pulse power | Withstands severe load-dump and inductive switching transients common in 12 V/24 V vehicle electrical systems. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage stress on protected ICs while maintaining fast response (<1 ns) and low incremental surge resistance. |
| MSL Level 1, 260 °C reflow compatible | Enables single-pass lead-free reflow assembly without moisture-related popcorn failure or delamination. |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal cycling and humidity exposure. |
Applications
| Automotive CAN Bus Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting high-speed CAN FD transceivers against ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 5a (load dump) in 12 V vehicle networks. IC Role / Device Role / Timing Role: Bi-directional TVS placed across CANH–CANL differential pair and/or between each line and chassis ground. Use Value: Limits transient voltage to ≤64.5 V, preserving transceiver functionality and preventing bus lockup during repeated surges. | Use Scenario: Safeguarding 5 V/3.3 V regulator inputs in engine control modules exposed to alternator load dump up to 40 V. IC Role / Device Role / Timing Role: Primary front-end clamp on main 12 V input rail prior to DC/DC conversion stage. Use Value: Absorbs 1500 W surge energy without degradation, eliminating need for secondary crowbar circuits or fuses. |
| ADAS Camera Module Signal Lines | Body Control Module (BCM) Sensor Interfaces |
Use Scenario: Shielding MIPI CSI-2 data lines and power rails in rear-view or surround-view cameras from ESD and board-level transients. IC Role / Device Role / Timing Role: Localized bi-directional TVS mounted adjacent to connector or image sensor IC pins. Use Value: Provides <1 ns response and ≤1.0 μA leakage to avoid signal distortion while meeting ISO 10605 ±15 kV contact discharge requirements. | Use Scenario: Protecting LIN bus, PWM-controlled LED drivers, and analog sensor inputs (e.g., ambient light, rain sensors) in door modules and lighting controllers. IC Role / Device Role / Timing Role: Point-of-use suppression on each protected signal path, leveraging compact DO-214AB footprint. Use Value: Enables high-density PCB layout with AEC-Q101 assurance and zero maintenance over 15-year vehicle service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40A-E3/52T | Lower PPPM (400 W), SMA package (smaller footprint, higher RθJA), uni-directional only. | Suitable for non-automotive consumer or industrial low-energy transients; not AEC-Q101 qualified. | Select when space-constrained and surge energy is ≤400 W; verify unidirectional polarity alignment in design. |
| 1.5KE40CA | Through-hole TO-218 package, same 40 V VWM and bi-directional function, but 1500 W rating requires larger board area and manual assembly. | Preferred for legacy designs, prototyping, or high-reliability industrial power supplies where SMT is not feasible. | Choose for ease of hand-soldering or when thermal mass from large copper pours justifies through-hole mounting. |
Compared with SMCJ40HE3/57T, SMAJ40A-E3/52T offers smaller size but reduced surge capability and no automotive qualification, while 1.5KE40CA delivers identical electrical performance in a less automated, higher-profile package - making SMCJ40HE3/57T optimal for volume automotive SMT production.
Availability
SMCJ40HE3/57T is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom infrastructure requiring stable component supply, AEC-Q101 compliance, and 1500 W transient immunity.
Supply support for SMCJ40HE3/57T 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 automotive, industrial, and computing applications.
The SMCJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments - prioritizing clamping precision, surge endurance, and qualification rigor for safety-critical automotive subsystems.
FAQ
What is the clamping voltage of SMCJ40HE3/57T under maximum rated surge current?
The SMCJ40HE3/57T has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPPM) of 23.3 A using the standard 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and ensures protected circuitry remains within safe operating limits during transient events. The SMCJ40HE3/57T maintains this clamping performance across its full operating temperature range of −55 °C to +150 °C.
Is SMCJ40HE3/57T suitable for protecting CAN FD interfaces?
Yes, the SMCJ40HE3/57T is well-suited for CAN FD interface protection due to its bi-directional symmetry, 64.5 V clamping voltage, sub-nanosecond response time, and AEC-Q101 qualification. Its low leakage (≤1.0 μA at 40 V) avoids signal attenuation on high-speed differential pairs, and its 1500 W rating exceeds ISO 7637-2 Pulse 1 and Pulse 2a requirements. The SMCJ40HE3/57T is routinely deployed across automotive CAN FD nodes in ECUs and gateway modules.
Does SMCJ40HE3/57T have a polarity marking on the package?
No, the SMCJ40HE3/57T does not feature a polarity marking such as a cathode band because it is a bi-directional TVS diode. Unlike uni-directional variants (e.g., SMCJ40A), which use a band to denote the cathode end, bi-directional devices like the SMCJ40HE3/57T exhibit identical electrical behavior in both directions and therefore carry no polarity indicator. This simplifies placement in symmetric protection topologies like differential signal lines.
What is the thermal resistance of SMCJ40HE3/57T, and how does it affect PCB layout?
The SMCJ40HE3/57T has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on the minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. This value assumes standard FR-4 board material and natural convection; adding internal copper planes or thermal vias can reduce RθJA significantly. Proper pad sizing directly impacts sustained surge handling - undersized pads cause premature thermal runaway during repetitive transients. The SMCJ40HE3/57T's RθJL of 15 °C/W further emphasizes the importance of short, wide traces to maximize heat transfer to the PCB.
How does the HE3 suffix in SMCJ40HE3/57T differ from the E3 suffix?
Within the SMCJ family, the HE3 suffix denotes AEC-Q101 qualification and JESD 201 Class 2 whisker resistance, whereas the E3 suffix indicates RoHS compliance and JESD 201 Class 1A whisker resistance but no automotive qualification. The SMCJ40HE3/57T is therefore certified for automotive applications requiring extended temperature operation, accelerated lifetime testing, and enhanced metallurgical reliability - making it mandatory for powertrain, ADAS, and body electronics where field failure is unacceptable. The SMCJ40HE3/57T undergoes additional stress screening beyond standard commercial-grade E3 variants.
SMCJ40HE3/57T 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ40HE3/57T FAQ
1.How can I place an order for SMCJ40HE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40HE3/57T 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 SMCJ40HE3/57T reliable?
The price and inventory of SMCJ40HE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40HE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ40HE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40HE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40HE3/57T?
SMCJ40HE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40HE3/57T 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 SMCJ40HE3/57T?
For technical support, including SMCJ40HE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40HE3/57T requirements.
6.How does Aetrix verify that SMCJ40HE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ40HE3/57T 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 SMCJ40HE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ40HE3/57T?
All SMCJ40HE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40HE3/57T, 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 SMCJ40HE3/57T part is unused and in its original packaging.
Return procedure for SMCJ40HE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40HE3/57T Tags
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