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Vishay General Semiconductor - Diodes Division SMCJ40AHE3_A/I
- Part No.:
- SMCJ40AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40AHE3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,284
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Product details
Overview
SMCJ40AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR), 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 - deployed in automotive ECUs, industrial motor drives, and telecom power supplies.
For engineers reviewing the SMCJ40AHE3_A/I datasheet, SMCJ40AHE3_A/I pinout, SMCJ40AHE3_A/I application, or SMCJ40AHE3_A/I equivalent, key selection criteria include clamping performance under 23.3 A surge, AEC-Q101 qualification status, thermal resistance (RθJA = 75 °C/W), unidirectional polarity marking, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by transient overvoltages exceeding its reverse stand-off voltage (VWM = 40 V). Its glass-passivated junction enables fast response (<1 ns) and low incremental surge resistance, ensuring reliable suppression of ESD, lightning-induced surges, and inductive switching spikes.
Designed for unidirectional operation, the SMCJ40AHE3_A/I uses cathode-band polarity identification and delivers stable clamping up to 64.5 V at rated IPPM. It meets MSL Level 1 per J-STD-020, supports peak forward surge current (IFSM) of 200 A (8.3 ms half-sine), and maintains operation across -55 °C to +150 °C junction temperature range.
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 IT = 1 mA - Validated breakdown threshold ensures predictable turn-on margin above VWM |
| VC @ IPPM | 64.5 V at 23.3 A (10/1000 µs) - Clamping voltage defines worst-case stress on protected ICs during surge |
| PPPM | 1500 W - Peak transient energy handling capacity determines survivability against high-energy transients |
| RθJA | 75 °C/W - Junction-to-ambient thermal resistance informs PCB pad design and derating above 25 °C |
| TJ max | +150 °C - Maximum junction temperature sets upper limit for thermal design and reliability validation |
| AEC-Q101 | Qualified - Confirmed reliability for automotive electronics per stress test standard |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, RoHS-compliant and AEC-Q101 qualified. Dimensions: 7.75 mm × 6.22 mm × 2.62 mm (L × W × H); cathode identified by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lower-potential rail; completes clamping path during reverse-biased surge |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 40 V supply rail); band-marked end accepts transient energy |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable leakage (<1 µA at VWM) and long-term reliability under thermal cycling |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving protection margin for downstream ICs |
| MSL Level 1 rating | Enables standard reflow without moisture sensitivity concerns - no baking required prior to assembly |
| Automated placement compatibility | Standard SMC footprint and lead geometry support high-speed pick-and-place with >99.9% placement yield |
| UL 94 V-0 molding compound | Provides flame-retardant encapsulation meeting safety requirements for industrial and automotive enclosures |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Protecting 42 V battery-supplied microcontrollers and CAN transceivers in engine control units against load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between 42 V rail and ground, activated within <1 ns upon overvoltage detection. Use Value: Limits transient voltage to ≤64.5 V, preventing latch-up or gate oxide damage in 40 V-rated logic and communication ICs. | Use Scenario: Safeguarding gate drivers and feedback sensors in 3-phase inverters exposed to IGBT switching noise and regenerative braking spikes. IC Role / Device Role / Timing Role: Standoff protector on isolated DC link monitoring lines and auxiliary 24 V control rails. Use Value: Maintains signal integrity by suppressing sub-100 ns transients while adding <1 pF capacitance - negligible impact on feedback loop stability. |
| Telecom DC Power Input | Consumer Power Adapter Output |
Use Scenario: Secondary-side overvoltage clamp on 48 V PoE++ (IEEE 802.3bt) power inputs to network switches and access points. IC Role / Device Role / Timing Role: Primary surge suppression element upstream of DC-DC converters and Ethernet PHYs. Use Value: Absorbs 1500 W surges per IEEE 61000-4-5 Level 4 testing without degradation, supporting field-replaceable system design. | Use Scenario: Output rail protection in universal AC/DC adapters supplying USB-C PD devices with variable 5–40 V output profiles. IC Role / Device Role / Timing Role: Final-stage clamp on regulated output to prevent overvoltage damage during regulator fault conditions. Use Value: Guarantees safe shutdown of connected devices by clamping to 64.5 V even during sustained short-circuit faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40AHE3/A | Lower PPPM (400 W), smaller SMA package, higher RθJA (110 °C/W) | Not suitable for 1500 W surge environments; limited to low-energy signal-line protection | Select only when board space is constrained and surge energy is ≤400 W |
| SMCJ40CAHE3_A/I | Bidirectional variant; same VWM/VBR/VC ratings but symmetrical clamping in both polarities | Required for AC-coupled or floating signal lines where polarity reversal occurs (e.g., RS-485, audio) | Choose when protecting bidirectional interfaces - not a drop-in replacement for unidirectional use cases |
Compared with SMAJ40AHE3/A and SMCJ40CAHE3_A/I, the SMCJ40AHE3_A/I uniquely balances 1500 W surge capability, AEC-Q101 qualification, and SMC package thermal performance - making it optimal for high-reliability DC power rail protection where energy absorption and automotive compliance are mandatory.
Availability
SMCJ40AHE3_A/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial motor drive systems, and telecom power supply architectures requiring stable component supply, full traceability, and long-term lifecycle assurance.
Supply support for SMCJ40AHE3_A/I 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 engineered 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 SMCJ40AHE3_A/I at its rated peak pulse current?
The SMCJ40AHE3_A/I 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 under defined test conditions per JEDEC standards and represents the upper voltage limit imposed on protected circuitry during a full-power transient event. The SMCJ40AHE3_A/I maintains this clamping performance consistently across its qualified temperature range.
Is SMCJ40AHE3_A/I qualified for automotive applications?
Yes, the SMCJ40AHE3_A/I is AEC-Q101 qualified, confirming its suitability for automotive electronic systems including engine control units, body control modules, and ADAS power domains. The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified construction. This qualification covers stress tests for temperature cycling, humidity, mechanical shock, and surge endurance - all validated per the latest revision of the AEC-Q101 standard.
What does the "_A/I" suffix mean in SMCJ40AHE3_A/I?
The "_A/I" suffix in SMCJ40AHE3_A/I indicates the packaging configuration: "A" denotes the revision code (Revision A per Vishay's internal documentation), and "I" specifies the delivery mode - 13-inch diameter plastic tape and reel with a base quantity of 3500 units. This format aligns with Vishay's standardized ordering nomenclature and ensures correct material handling and SMT line compatibility.
How does the thermal resistance of SMCJ40AHE3_A/I affect PCB layout?
The SMCJ40AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 75 °C/W when mounted on minimum recommended 8.0 mm × 8.0 mm copper pads per terminal. To maintain TJ ≤ 150 °C under continuous 6.5 W power dissipation, designers must allocate sufficient copper area and consider airflow or adjacent heat sources. Reducing pad size or omitting thermal vias increases RθJA and risks thermal runaway during repeated surge events.
Can SMCJ40AHE3_A/I be used in bidirectional signal protection?
No, the SMCJ40AHE3_A/I is a unidirectional TVS diode and must not be used for bidirectional signal lines such as RS-485, CAN, or AC-coupled interfaces. Its cathode-band polarity restricts conduction to reverse-bias only; forward conduction would cause permanent damage. For bidirectional protection, the functionally matched SMCJ40CAHE3_A/I - with identical VWM, VBR, and VC ratings but symmetrical clamping - must be selected instead.
SMCJ40AHE3_A/I 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:
- -
- 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_A/I FAQ
1.How can I place an order for SMCJ40AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40AHE3_A/I 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_A/I reliable?
The price and inventory of SMCJ40AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ40AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40AHE3_A/I?
SMCJ40AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40AHE3_A/I 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_A/I?
For technical support, including SMCJ40AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40AHE3_A/I requirements.
6.How does Aetrix verify that SMCJ40AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ40AHE3_A/I 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_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ40AHE3_A/I?
All SMCJ40AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40AHE3_A/I, 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_A/I part is unused and in its original packaging.
Return procedure for SMCJ40AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40AHE3_A/I Tags
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