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Vishay General Semiconductor - Diodes Division SMCJ40AHE3/57T
- Part No.:
- SMCJ40AHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40AHE3/57T.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,137
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Product details
Overview
SMCJ40AHE3/57T from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection. It features a 40 V standoff voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 1500 W peak pulse power (10/1000 μs), and clamps transients to ≤64.5 V at 23.3 A. It is AEC-Q101 qualified and used to protect automotive power rails and sensor interfaces against load dump and inductive switching.
For engineers reviewing the SMCJ40AHE3/57T datasheet, SMCJ40AHE3/57T pinout, SMCJ40AHE3/57T application, or SMCJ40AHE3/57T equivalent, this page delivers verified electrical specs, thermal derating behavior, junction-to-lead resistance, polarity marking convention, and AEC-Q101 qualification status - all critical for automotive-grade circuit hardening and IEC 61000-4-5 compliance planning.
Technical Context
The SMCJ40AHE3/57T operates as a unidirectional avalanche clamp with glass-passivated junction, enabling sub-nanosecond response to ESD and surge events. Its low incremental surge resistance (≤0.1 Ω typical) and 1500 W PPPM rating support robust protection of 12 V and 24 V automotive systems against ISO 7637-2 Pulse 1, 2a, 3a/b, and ISO 16750-2 load-dump surges.
Thermally, it exhibits RθJL = 15 °C/W and RθJA = 75 °C/W (on 8 mm × 8 mm copper pads), allowing reliable operation up to TJ = 150 °C. The cathode band marking confirms polarity, and its matte tin-plated leads meet J-STD-002 solderability and JESD 22-B102 whisker testing Class 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin for 12 V/24 V rail protection. |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on under surge conditions. |
| VC @ IPPM | ≤64.5 V at 23.3 A - Clamped voltage during 1500 W 10/1000 μs surge; determines protected IC's maximum stress level. |
| PPPM | 1500 W - Peak pulse power handling per JEDEC standard; supports automotive-level surge immunity without degradation. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood environments with minimal thermal derating. |
| IFSM | 200 A - Non-repetitive forward surge current (8.3 ms half-sine); validates robustness against accidental reverse-bias faults. |
| Package | SMC (DO-214AB) - Surface-mount outline with 7.75 mm × 6.22 mm footprint; compatible with automated placement and reflow profiles up to 260 °C peak. |
Pinout & Package
SMCJ40AHE3/57T uses the SMC (DO-214AB) package: 2-terminal surface-mount device with cathode indicated by a visible band on the body. Leads are matte tin-plated, compliant with J-STD-002 and JESD 22-B102 Class 2 whisker testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or low-impedance return path; carries full surge current during clamping. |
| Cathode | High-side connection; marked with band | Connected to protected line (e.g., battery rail); blocks reverse leakage below VWM and avalanches above VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and ADAS sensor modules per stress test requirements. |
| Glass passivated junction | Ensures stable VBR over lifetime and improved reliability under humidity and thermal cycling vs. epoxy-passivated alternatives. |
| MSL Level 1 (260 °C) | Enables single-reflow assembly without moisture sensitivity concerns; eliminates bake requirement pre-SMT. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ISO 10605 ESD), improving clamping precision. |
| UL 94 V-0 molding compound | Meets flammability safety standards for enclosed automotive and industrial enclosures. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs from load dump (ISO 16750-2) and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and input filter capacitor to clamp surges before LDOs or microcontrollers. Use Value: Limits peak voltage to ≤64.5 V during 1500 W surges, preventing damage to downstream 36 V-rated regulators and CAN transceivers. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt transients before signal conditioning op-amps or ADC inputs. Use Value: Sub-nanosecond response and ≤1.0 μA leakage at 40 V ensure signal integrity and zero offset drift in precision measurement circuits. |
| Telecom DC Power Input Protection | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding PoE-powered equipment front-end DC-DC converters from lightning-induced surges on 48 V input lines. IC Role / Device Role / Timing Role: Primary surge clamp on secondary-side 48 V bus, coordinated with upstream MOVs and common-mode chokes. Use Value: 1500 W rating and 64.5 V clamping enable compliance with IEC 61000-4-5 Level 4 (4 kV) when combined with proper PCB layout. | Use Scenario: Protecting MCU GPIOs and gate drivers in washing machine motor control boards from inductive kickback. IC Role / Device Role / Timing Role: TVS placed across relay coils or MOSFET drain-source to absorb energy from switched inductive loads. Use Value: 200 A IFSM rating withstands repeated 8.3 ms half-sine faults, extending board life in high-cycle appliance applications. |
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 = 110 °C/W), same VWM/VBR range | Not suitable for automotive load dump; limited to low-energy consumer electronics | Select only for space-constrained non-automotive designs where surge energy ≤400 W |
| 1.5KE40A | Through-hole DO-201 package, same 40 V VWM, but higher VC (69.4 V) and lower IPPM (21.6 A) | Requires manual assembly; unsuitable for high-volume SMT production | Choose only for legacy through-hole designs or prototyping where rework tolerance is prioritized over automation |
Compared with SMAJ40A-E3/61 and 1.5KE40A, the SMCJ40AHE3/57T delivers 3.75× higher surge power handling, AEC-Q101 qualification for automotive use, and SMT compatibility - making it the only option among the three validated for under-hood deployment with guaranteed thermal performance on standard PCB copper areas.
Availability
SMCJ40AHE3/57T is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, telecom power supplies, and consumer appliance motor drives requiring stable component supply and long-term lifecycle assurance.
Supply support for SMCJ40AHE3/57T 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, automotive qualification, and high-power handling.
The SMCJ series was engineered specifically for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated.
FAQ
What is the clamping voltage of the SMCJ40AHE3/57T at its rated peak pulse current?
The SMCJ40AHE3/57T 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 8.0 mm × 8.0 mm copper pads per terminal and defines the upper voltage limit imposed on protected circuitry during surge events. The SMCJ40AHE3/57T maintains this clamping performance across its full operating temperature range.
Is the SMCJ40AHE3/57T qualified for automotive applications?
Yes, the SMCJ40AHE3/57T is AEC-Q101 qualified, as confirmed by Vishay's documentation and ordering code suffix "HE3". This qualification covers stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing - validating its suitability for under-hood automotive electronics such as body control modules and ADAS sensor hubs. The SMCJ40AHE3/57T meets these requirements without derating.
What does the "HE3" suffix indicate in SMCJ40AHE3/57T?
"HE3" denotes RoHS-compliant construction with AEC-Q101 qualification, distinguishing it from commercial-grade "E3" variants. The "H" prefix in HE3 explicitly signals automotive qualification, while "E3" confirms lead-free, halogen-free compliance per JEDEC standards. This suffix is tied directly to the SMCJ40AHE3/57T's material composition, test protocol execution, and traceability - not a generic family designation.
How does the SMCJ40AHE3/57T differ from bidirectional versions like SMCJ40CA?
The SMCJ40AHE3/57T is unidirectional and features a cathode band for polarity identification, whereas SMCJ40CA is bidirectional with no polarity marking and symmetrical clamping in both directions. Electrically, the SMCJ40AHE3/57T blocks reverse current up to 40 V and clamps only in reverse avalanche, making it ideal for DC rail protection. The SMCJ40AHE3/57T cannot substitute for SMCJ40CA in AC-coupled or differential signal paths without circuit redesign.
What is the thermal resistance from junction to lead (RθJL) for the SMCJ40AHE3/57T?
The SMCJ40AHE3/57T has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, measured under standard test conditions. This low value enables efficient heat transfer from the silicon die to the PCB copper via the leads, supporting sustained power dissipation in compact layouts. When designing thermal relief for the SMCJ40AHE3/57T, this parameter - not RθJA - governs short-pulse thermal performance during surge events.
SMCJ40AHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ40AHE3/57T FAQ
1.How can I place an order for SMCJ40AHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40AHE3/57T 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 SMCJ40AHE3/57T reliable?
The price and inventory of SMCJ40AHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40AHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ40AHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40AHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40AHE3/57T?
SMCJ40AHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40AHE3/57T 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 SMCJ40AHE3/57T?
For technical support, including SMCJ40AHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40AHE3/57T requirements.
6.How does Aetrix verify that SMCJ40AHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ40AHE3/57T 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 SMCJ40AHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ40AHE3/57T?
All SMCJ40AHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40AHE3/57T, 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 SMCJ40AHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ40AHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40AHE3/57T Tags
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