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Vishay General Semiconductor - Diodes Division SMCJ40HE3/9AT
- Part No.:
- SMCJ40HE3/9AT
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40HE3/9AT.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,849
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Product details
Overview
SMCJ40HE3/9AT 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), 1500 W peak pulse power (10/1000 µs), and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMCJ40HE3/9AT datasheet, SMCJ40HE3/9AT pinout, SMCJ40HE3/9AT application, or SMCJ40HE3/9AT equivalent, key selection criteria include its 40 V reverse stand-off rating, low 1.0 µA leakage at VWM, 75 °C/W junction-to-ambient thermal resistance, and compatibility with automated SMT placement on 8.0 mm × 8.0 mm copper pads.
Technical Context
The SMCJ40HE3/9AT operates as a silicon avalanche diode that enters breakdown when transient voltage exceeds its 44.4–49.1 V breakdown range (VBR at 1.0 mA), clamping the line to ≤64.5 V within picoseconds. Its glass-passivated junction ensures stable leakage and long-term reliability under repetitive surge stress.
Designed for unidirectional protection only, it conducts surge current from anode to cathode during overvoltage events, with no marking band required for bidirectional variants - but SMCJ40HE3/9AT uses a cathode band. It meets MSL Level 1 per J-STD-020 and supports peak forward surge current up to 200 A (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin. |
| VBR min/max | 44.4 V / 49.1 V at 1.0 mA - Confirmed breakdown threshold range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 64.5 V at 23.3 A - Clamped voltage during 10/1000 µs surge; determines protected IC's voltage stress limit. |
| PPPM | 1500 W - Peak pulse power handling capacity; validates immunity to IEC 61000-4-5 Level 4 surges. |
| IPPM | 23.3 A - Peak surge current capability at rated clamping voltage; used to size PCB trace width and pad area. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 75 °C/W - Thermal resistance junction-to-ambient on standard 8.0 mm × 8.0 mm pads; informs derating above 25 °C. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode identified by a band on the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to ground or low-impedance return plane; carries full transient current during clamping. |
| Cathode | Protected line connection | Connected to the line being protected (e.g., 40 V supply rail); voltage referenced to anode during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units and ADAS sensors. |
| Glass passivated junction | Ensures stable VBR and low leakage (<1.0 µA) over temperature and lifetime. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns. |
| Low incremental surge resistance | Minimizes VC overshoot during fast transients, improving protection margin for downstream ICs. |
| RoHS-compliant HE3 suffix | Indicates AEC-Q101 qualification and JESD 201 Class 2 whisker resistance for high-reliability assembly. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 40 V battery-fed ECUs against load dump and alternator transients in 12 V/42 V dual-voltage systems. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before they reach LDOs or microcontrollers. Use Value: Withstands 1500 W pulses and clamps to 64.5 V, keeping protected devices below absolute maximum ratings during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to PLC I/O modules exposed to field wiring transients. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt induced EFT/burst energy away from precision ADC front-ends. Use Value: 1.0 µA leakage at 40 V ensures minimal impact on mV-level sensor signals; fast response preserves signal integrity. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Suppression |
Use Scenario: Shielding buck converter inputs in telecom power supplies from coupling noise and lightning-induced surges on -48 V distribution buses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input capacitor node, coordinated with upstream fuses and common-mode chokes. Use Value: 200 A IFSM rating supports coordination with slow-blow fuses; DO-214AB footprint allows compact layout near input terminals. |
Use Scenario: Front-end protection for Ethernet PHYs and PoE injectors subjected to longitudinal surges per GR-1089-CORE. IC Role / Device Role / Timing Role: Unidirectional TVS on DC bias lines (e.g., PoE mode detection), referenced to chassis ground. Use Value: AEC-Q101 qualification correlates with extended temperature and lifecycle requirements in carrier-grade equipment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ40AHE3/61T | Lower PPPM (400 W), smaller SMA package (DO-214AC), higher RθJA (110 °C/W) | Suitable for space-constrained consumer boards with lower surge exposure; not rated for automotive under-hood use. | Select when board area is critical and surge threat level is IEC 61000-4-5 Level 2. |
| SMCJ40A-E3/9AT | Same electrical specs and DO-214AB package, but commercial-grade (not AEC-Q101 qualified); HE3 vs. E3 whisker test class. | Acceptable for industrial automation where automotive qualification is not mandated. | Choose for cost-sensitive non-automotive designs requiring identical clamping performance and footprint. |
Compared with SMCJ40HE3/9AT, SMAJ40AHE3/61T offers reduced surge capacity in a smaller package, while SMCJ40A-E3/9AT delivers identical protection without AEC-Q101 validation - making the HE3 variant essential for automotive safety-critical nodes.
Availability
SMCJ40HE3/9AT is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC-DC converter input surge suppression requiring stable component supply and AEC-Q101 compliance.
Supply support for SMCJ40HE3/9AT 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 and automotive qualification.
The SMCJ series targets high-energy transient suppression in harsh environments, with design focus on automotive, industrial, and telecom infrastructure where robustness and standardized qualification (AEC-Q101, UL 497B) are mandatory.
FAQ
What does the "HE3" suffix indicate in SMCJ40HE3/9AT?
The HE3 suffix in SMCJ40HE3/9AT denotes RoHS-compliant construction with AEC-Q101 qualification and JESD 201 Class 2 whisker resistance. This distinguishes it from the commercial-grade E3 variant and confirms suitability for automotive electronics where reliability under thermal cycling and vibration is critical. The SMCJ40HE3/9AT meets stringent automotive stress testing protocols beyond standard industrial requirements.
Can SMCJ40HE3/9AT be used for bidirectional transient protection?
No, SMCJ40HE3/9AT is strictly a unidirectional TVS diode, as confirmed by its part number suffix "A" (not "CA") and datasheet specification. It protects only against positive-going transients on the cathode side relative to anode. For bidirectional protection at 40 V, the correct variant is SMCJ40CA; using SMCJ40HE3/9AT in bidirectional circuits risks failure during negative excursions.
What is the minimum recommended PCB pad layout for SMCJ40HE3/9AT?
The datasheet specifies mounting on 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal to achieve rated 1500 W pulse power and proper thermal dissipation. Smaller pads reduce surge current capability and increase junction temperature. The SMCJ40HE3/9AT's thermal resistance (RθJA = 75 °C/W) is validated only with this layout - deviation requires derating per Figure 2 in Document 88394.
How does SMCJ40HE3/9AT compare to SMCJ40A-E3/9AT in terms of reliability?
SMCJ40HE3/9AT adds AEC-Q101 qualification and JESD 201 Class 2 whisker resistance versus the commercial SMCJ40A-E3/9AT. This means the HE3 variant undergoes accelerated life testing, temperature cycling, and mechanical shock validation required for automotive use. Both share identical electrical specs and DO-214AB packaging, but only SMCJ40HE3/9AT is approved for safety-critical vehicle subsystems.
Is SMCJ40HE3/9AT compatible with lead-free reflow soldering?
Yes, SMCJ40HE3/9AT is rated for MSL Level 1 per J-STD-020 with a maximum peak reflow temperature of 260 °C, fully compatible with standard lead-free soldering profiles. Its matte tin-plated leads meet J-STD-002 solderability requirements, and the glass-passivated chip junction remains stable through multiple thermal cycles - a key requirement verified in AEC-Q101 testing for the SMCJ40HE3/9AT.
SMCJ40HE3/9AT 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
SMCJ40HE3/9AT FAQ
1.How can I place an order for SMCJ40HE3/9AT through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40HE3/9AT 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 SMCJ40HE3/9AT reliable?
The price and inventory of SMCJ40HE3/9AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40HE3/9AT is usually 5 days.
3.What payment methods are accepted for SMCJ40HE3/9AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40HE3/9AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40HE3/9AT?
SMCJ40HE3/9AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40HE3/9AT 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 SMCJ40HE3/9AT?
For technical support, including SMCJ40HE3/9AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40HE3/9AT requirements.
6.How does Aetrix verify that SMCJ40HE3/9AT is sourced from the original manufacturer or authorized distributors?
All SMCJ40HE3/9AT 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 SMCJ40HE3/9AT meets industry standards.
7.What is the process for return or replacement of SMCJ40HE3/9AT?
All SMCJ40HE3/9AT units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40HE3/9AT, 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 SMCJ40HE3/9AT part is unused and in its original packaging.
Return procedure for SMCJ40HE3/9AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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