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Vishay General Semiconductor - Diodes Division SMBJ40HE3/5B
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- Part No.:
- SMBJ40HE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40HE3/5B.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,507
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Product details
Overview
SMBJ40HE3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping fast-rising ESD and surge transients on power and signal lines. It features 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR at 1 mA), 64.5 V maximum clamping voltage (VC) at 9.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power rail protection and industrial sensor interface circuits.
For engineers reviewing the SMBJ40HE3/5B datasheet, SMBJ40HE3/5B pinout, SMBJ40HE3/5B application, or SMBJ40HE3/5B equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and packaging configuration for production-grade surge protection design.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, leveraging glass-passivated silicon junction technology for stable avalanche behavior under repetitive surge stress. Its low incremental surge resistance and sub-nanosecond response time enable effective suppression of inductive switching spikes and lightning-induced transients.
The SMBJ40HE3/5B is rated for 600 W peak pulse power (10/1000 µs), 5.0 W steady-state power dissipation at 50 °C, and 100 A non-repetitive forward surge current (8.3 ms half-sine). It meets MSL Level 1 per J-STD-020 and is AEC-Q101 qualified - confirming suitability for automotive electronics environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC bias margin for protected line |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - guaranteed avalanche initiation window; ensures consistent turn-on across temperature and unit variation |
| VC @ IPPM | 64.5 V at 9.3 A - clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs |
| PPPM | 600 W - peak transient power handling capacity; enables robust protection against IEC 61000-4-5 Level 4 surges |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive and high-ambient industrial settings |
| RθJA | 100 °C/W - thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal layout requirements |
| IFSM | 100 A - single half-sine surge current rating (8.3 ms); validates capability to survive motor driver or relay coil turn-off events |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode identified by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal (cathode-banded side is opposite) | Connected to system ground or lower-potential rail; completes clamping path during reverse transient |
| Cathode | Avalanche conduction terminal (marked with band) | Connected to protected line (e.g., 40 V supply rail); conducts when line voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control units and body electronics - supports PPAP and long-term reliability requirements |
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-earth) without derating in typical layouts |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage stress on protected MOSFETs or microcontrollers during transient events |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and reflow compatibility with standard lead-free profiles (peak 260 °C) |
| Glass-passivated junction | Ensures stable leakage (<1 µA at VWM) and repeatable breakdown characteristics over 10+ years field life |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface |
|---|---|
|
Use Scenario: 12 V battery-supplied ECUs exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and upstream LDO/regulator input. Use Value: Clamps transients to ≤64.5 V, preventing damage to 40 V-rated input stages while maintaining <1 µA leakage at nominal 13.5 V operation. |
Use Scenario: 4–20 mA current loop transmitter connected to PLC analog input subjected to field wiring ESD. IC Role / Device Role / Timing Role: TVS mounted across loop terminals to shunt ±8 kV contact ESD (IEC 61000-4-2) before reaching op-amp front-end. Use Value: Sub-ns response limits voltage overshoot to <65 V, preserving 24 V loop compliance and avoiding ADC saturation or latch-up. |
| DC Motor Drive Feedback Line | Telecom Power Supply Input |
|
Use Scenario: Hall-effect position sensor output line routed near brushed DC motor commutation noise sources. IC Role / Device Role / Timing Role: SMBJ40HE3/5B installed in series with sensor output trace, referenced to local ground. Use Value: Suppresses inductive kickback spikes (up to 600 W) without distorting low-level analog feedback signals due to low capacitance (<100 pF). |
Use Scenario: Primary-side input of AC/DC adapter subjected to differential-mode surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Unidirectional TVS placed between rectified DC bus (+) and chassis ground. Use Value: Withstands repeated 10/1000 µs surges up to 9.3 A while maintaining 40 V standoff for proper bulk capacitor charging sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40A-E3/5B | No AEC-Q101 qualification; commercial-grade only; identical electrical specs and SMB package | Not approved for automotive production; suitable for industrial/commercial designs without automotive certification requirements | Select SMBJ40A-E3/5B when AEC-Q101 is not mandated and cost optimization is prioritized |
| SMBJ43HE3/5B | Higher VWM (43 V), VBR (47.8–52.8 V), and VC (69.4 V); same 600 W rating and AEC-Q101 qualification | Better margin for 42 V nominal systems (e.g., dual-battery automotive); higher clamping voltage increases protected IC stress | Choose SMBJ43HE3/5B for 42 V architectures where 40 V VWM risks false triggering during normal transients |
Compared with SMBJ40A-E3/5B, the SMBJ40HE3/5B adds automotive qualification without electrical trade-offs; versus SMBJ43HE3/5B, it provides tighter clamping headroom for 12/24 V systems but less margin against sustained overvoltage conditions.
Availability
SMBJ40HE3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, DC motor drive feedback protection, and telecom power supply inputs requiring stable component supply and AEC-Q101 compliance.
Supply support for SMBJ40HE3/5B 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 application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where robustness, consistency, and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ40HE3/5B at its rated peak pulse current?
The SMBJ40HE3/5B has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ40HE3/5B maintains this clamping performance across its full operating temperature range (–55 to +150 °C).
Is SMBJ40HE3/5B suitable for automotive applications?
Yes, SMBJ40HE3/5B is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HE3". It undergoes stress testing for temperature cycling, humidity, mechanical shock, and surge endurance per AEC standards. The SMBJ40HE3/5B is commonly deployed in engine control modules, body control units, and ADAS power supplies where certified reliability is required.
What does the "5B" in SMBJ40HE3/5B indicate?
The "5B" suffix in SMBJ40HE3/5B specifies the packaging format: 13-inch diameter plastic tape and reel, with a base quantity of 3200 units per reel. This differs from "52", which denotes 7-inch reels of 750 units. The "HE3" portion confirms RoHS-compliant construction and AEC-Q101 qualification, while "SMBJ40" identifies the 40 V stand-off voltage variant within the SMBJ family.
How does SMBJ40HE3/5B compare to bidirectional TVS diodes like SMBJ40CA?
The SMBJ40HE3/5B is unidirectional and intended for DC line protection with defined polarity (cathode-banded), whereas SMBJ40CA is bidirectional and used in AC or floating signal paths. SMBJ40HE3/5B offers lower leakage (<1 µA at 40 V) and supports forward conduction during fault conditions, while SMBJ40CA provides symmetrical clamping but higher leakage in both directions. They are not interchangeable without circuit redesign.
What is the thermal resistance and recommended pad layout for SMBJ40HE3/5B?
The SMBJ40HE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To achieve this rating, PCB layout must use solid copper pours connected to both anode and cathode pads, with no thermal relief. Reduced pad area increases RθJA, lowering surge survivability under repeated stress.
SMBJ40HE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- 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):
- 8.4A
- 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)
SMBJ40HE3/5B FAQ
1.How can I place an order for SMBJ40HE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40HE3/5B 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 SMBJ40HE3/5B reliable?
The price and inventory of SMBJ40HE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40HE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ40HE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40HE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40HE3/5B?
SMBJ40HE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40HE3/5B 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 SMBJ40HE3/5B?
For technical support, including SMBJ40HE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40HE3/5B requirements.
6.How does Aetrix verify that SMBJ40HE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ40HE3/5B 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 SMBJ40HE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ40HE3/5B?
All SMBJ40HE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40HE3/5B, 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 SMBJ40HE3/5B part is unused and in its original packaging.
Return procedure for SMBJ40HE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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