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Vishay General Semiconductor - Diodes Division SMBJ40AHE3/52
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- Part No.:
- SMBJ40AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AHE3/52.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,245
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Product details
Overview
SMBJ40AHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of DC power rails and signal lines. It features a 40 V standoff voltage (VWM), 44.4–49.1 V breakdown range at 1 mA, 64.5 V maximum clamping voltage at 9.3 A peak pulse current, and 600 W peak pulse power rating per 10/1000 µs waveform - deployed in automotive ECUs, industrial I/O modules, and sensor interface circuits.
For engineers reviewing the SMBJ40AHE3/52 datasheet, SMBJ40AHE3/52 pinout, SMBJ40AHE3/52 application, or SMBJ40AHE3/52 equivalent, key selection criteria include its AEC-Q101 qualification, low clamping ratio (VC/VBR ≈ 1.37), 100 °C/W junction-to-ambient thermal resistance, and compatibility with automated SMT placement on SMB (DO-214AA) footprint.
Technical Context
This unidirectional TVS operates as a fast-acting shunt clamp: under normal bias it presents <1.0 µA leakage at 40 V; during transients exceeding VBR, it avalanches to limit voltage across protected circuitry. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive load dump) immunity requirements when properly laid out with minimal trace inductance. Its MSL Level 1 rating and 260 °C lead-free reflow compatibility support high-volume manufacturing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant leakage; sets upper limit for protected line voltage. |
| VBR @ IT=1 mA | 44.4–49.1 V - Breakdown onset range; defines minimum clamping threshold under surge conditions. |
| VC @ IPPM=9.3 A | 64.5 V - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling; supports single-event surges up to 9.3 A without failure. |
| IFSM | 100 A - Non-repetitive forward surge rating (8.3 ms half-sine); validates robustness against load-dump events. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 5 mm × 5 mm copper pads; informs derating above 25 °C. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-banded unidirectional configuration. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), with matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest-potential node; completes conduction path during reverse avalanche. |
| Cathode (banded end) | High-side transient sensing terminal | Connected to protected line; avalanche initiates here when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control, body electronics, and ADAS sensors. |
| 600 W peak pulse power (10/1000 µs) | Withstands high-energy transients such as ISO 7637-2 Pulse 5a (load dump) without degradation. |
| Clamping voltage ≤64.5 V at 9.3 A | Provides margin below 65 V absolute maximum ratings of common 48 V automotive microcontrollers and CAN transceivers. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable VBR tolerance and low leakage drift over 15+ years in industrial temperature cycling. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply inputs in engine control units (ECUs) against load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt-clamp TVS placed directly at connector entry point, upstream of DC/DC converter input. Use Value: Limits transient voltage to ≤64.5 V, preventing damage to 65 V-rated input MOSFETs and enabling compliance with ISO 7637-2 Pulse 5a. |
Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) in pressure/temperature transmitters exposed to field wiring surges. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS used across signal and return paths to clamp both polarities relative to local ground. Use Value: Sub-1 ns response time and 64.5 V clamping preserve signal integrity while meeting IEC 61000-4-4 Level 4 (4 kV EFT) immunity. |
| Telecom DC Power Input Protection | Consumer USB-C Port VBUS Protection |
|
Use Scenario: Guarding -48 V DC telecom rectifier outputs against lightning-induced surges on distribution backplanes. IC Role / Device Role / Timing Role: Unidirectional TVS connected anode-to-ground, cathode-to-line, absorbing positive-going transients only. Use Value: 100 A IFSM rating handles sustained overvoltage events; 150 °C TJ max supports operation in sealed outdoor cabinets. |
Use Scenario: Secondary overvoltage protection on USB-C VBUS lines after primary eFuse, guarding against adapter fault conditions. IC Role / Device Role / Timing Role: Fast-response TVS placed adjacent to USB-C receptacle, clamping overshoot from faulty 20 V PD adapters. Use Value: 40 V VWM allows safe operation with 20 V PD + margin; 64.5 V VC stays below 65 V USB-C controller ABS MAX 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 |
|---|---|---|---|
| SMBJ40AHM3/52 | Halogen-free variant with identical electrical specs and AEC-Q101 qualification; same SMB package and pinout. | No functional difference; selected where halogen-free compliance is mandated by OEM or regional environmental policy. | Direct material substitution when RoHS + halogen-free certification is required; no layout or test changes needed. |
| SMCJ40AHE3/52 | Same VWM/VC but in larger SMC (DO-214AB) package; 1500 W PPPM, lower RθJA (50 °C/W), higher IPPM (15.2 A). | Used where higher surge energy absorption or improved thermal performance is required, e.g., main board-level protection. | Choose when system-level surge testing exceeds 600 W; requires PCB footprint change due to larger 7.11 mm × 6.22 mm body. |
Compared with SMBJ40AHE3/52, SMBJ40AHM3/52 offers identical protection performance with halogen-free construction, while SMCJ40AHE3/52 delivers 2.5× higher surge capacity at the cost of increased board area and thermal design adjustments.
Availability
SMBJ40AHE3/52 is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor systems, and telecom power supplies requiring stable component supply, AEC-Q101 validation, and consistent SMB footprint compatibility.
Supply support for SMBJ40AHE3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and automotive-grade qualification.
The SMBJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-reliability transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the clamping voltage of SMBJ40AHE3/52 at its rated peak pulse current?
The SMBJ40AHE3/52 has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current of 9.3 A using the standard 10/1000 µs waveform. This value is measured per IEC 61000-4-5 and guarantees that protected circuitry sees no more than 64.5 V during such transient events. The SMBJ40AHE3/52 maintains this clamping performance across its full operating temperature range of -55 °C to +150 °C.
Is SMBJ40AHE3/52 qualified for automotive applications?
Yes, SMBJ40AHE3/52 is AEC-Q101 qualified, as confirmed by Vishay's official 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 and chassis-mounted automotive electronics. The SMBJ40AHE3/52 meets requirements for engine control, body control modules, and ADAS sensor interfaces.
What is the standoff voltage rating of SMBJ40AHE3/52, and how does it relate to system design?
The standoff voltage (VWM) of SMBJ40AHE3/52 is 40 V - the maximum DC or continuous reverse voltage the device can block without entering avalanche conduction. In system design, this means SMBJ40AHE3/52 is intended for use on 36 V nominal systems (e.g., 48 V automotive architectures with 10% tolerance), ensuring reliable blocking during normal operation while providing headroom for transient suppression. Exceeding 40 V continuously will cause excessive leakage and potential thermal runaway.
Does SMBJ40AHE3/52 have a defined polarity, and how is it marked?
Yes, SMBJ40AHE3/52 is a unidirectional TVS diode with clearly defined polarity: the cathode is identified by a band printed on the device body, aligned with the cathode end of the SMB (DO-214AA) package. During PCB layout, the banded end must be connected to the line being protected, while the anode connects to ground or the reference plane. Incorrect orientation renders the device ineffective against positive transients.
What packaging and reel options are available for SMBJ40AHE3/52?
SMBJ40AHE3/52 is supplied in 7" diameter plastic tape-and-reel format with a base quantity of 750 units per reel (ordering code suffix /52). It uses industry-standard SMB carrier tape per EIA-481, compatible with all major pick-and-place equipment. The device is also available in 13" reels (/5B) for high-volume production, and both variants feature matte tin-plated leads certified to J-STD-002 and JESD 22-B102 for reliable solder joint formation.
SMBJ40AHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 9.3A
- Power - Peak Pulse:
- 600W
- 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-214AA (SMBJ)
SMBJ40AHE3/52 FAQ
1.How can I place an order for SMBJ40AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AHE3/52 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 SMBJ40AHE3/52 reliable?
The price and inventory of SMBJ40AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ40AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AHE3/52?
SMBJ40AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AHE3/52 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 SMBJ40AHE3/52?
For technical support, including SMBJ40AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AHE3/52 requirements.
6.How does Aetrix verify that SMBJ40AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ40AHE3/52 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 SMBJ40AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ40AHE3/52?
All SMBJ40AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AHE3/52, 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 SMBJ40AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ40AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AHE3/52 Tags
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