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Vishay General Semiconductor - Diodes Division SMBJ40AHE3/5B
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- Part No.:
- SMBJ40AHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AHE3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,870
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Product details
Overview
SMBJ40AHE3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on DC power rails and signal lines. It features a 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 (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ40AHE3/5B datasheet, SMBJ40AHE3/5B pinout, SMBJ40AHE3/5B application, or SMBJ40AHE3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compliance with UL 497B for surge protection systems.
Technical Context
This TVS diode operates as a voltage-clamping device in reverse-biased configuration, triggering when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while low incremental surge resistance enables effective energy diversion during ESD or lightning-induced surges.
The SMBJ40AHE3/5B is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and it is RoHS-compliant and AEC-Q101 qualified for automotive-grade reliability.
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 - defines reliable breakdown initiation window under standardized test conditions |
| VC @ IPPM | 64.5 V at 9.3 A - clamped voltage seen by protected circuit during worst-case 10/1000 µs surge |
| PPPM | 600 W - peak transient power dissipation capability with 0.01 % duty cycle repetitive surges |
| ID @ VWM | 1.0 µA - ultra-low reverse leakage ensures minimal standby power loss in high-impedance circuits |
| TJ max | +150 °C - enables operation in under-hood automotive or industrial ambient environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with cathode band marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); weight: 0.106 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; forms cathode-to-anode clamping path during overvoltage |
| Cathode | Reverse-biased clamping terminal | Marked with band; connected to higher-potential rail (e.g., VCC); conducts only during transient overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring long-term reliability under thermal cycling |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 (4 kV) surge events without degradation when mounted per recommended pad layout |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream components compared to higher-ratio suppressors |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; compatible with automated placement and high-volume manufacturing |
| UL 497B recognized | Approved for use in telecom and industrial surge protection assemblies requiring third-party safety certification |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VBAT and GND to clamp spikes up to ±120 V. Use Value: Limits voltage seen by MCU power input to ≤64.5 V during 600 W surge, preventing latch-up or permanent damage. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance TVS installed at connector entry point to shunt transients before reaching ADC front-end. Use Value: 1.0 µA leakage at 40 V preserves signal integrity in high-impedance sensor bridges without offset drift. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Suppression |
|
Use Scenario: Safeguarding buck converter inputs in PoE-powered devices exposed to Ethernet-coupled surges. IC Role / Device Role / Timing Role: Primary clamping device on 48 V input rail upstream of controller IC and MOSFETs. Use Value: 9.3 A IPPM rating handles IEC 61000-4-5 combination wave (10/700 µs) without derating beyond datasheet limits. |
Use Scenario: Secondary protection stage in DSL or POTS line interface cards after gas discharge tube primary suppression. IC Role / Device Role / Timing Role: Fast-response TVS providing precise clamping after coarse GDT filtering. Use Value: Sub-nanosecond response ensures clamping occurs before sensitive transceivers experience overvoltage stress. |
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 | Not suitable for automotive production; acceptable for industrial prototypes | Select SMBJ40AHE3/5B when automotive qualification or extended temperature validation is required |
| SAC40 | Same VWM (40 V) but lower PPPM (400 W); TO-236 (SOT-23) package | Limited to low-energy transients; unsuitable for IEC 61000-4-5 Level 4 | Choose SMBJ40AHE3/5B for higher surge robustness and PCB space efficiency in SMB footprint |
Compared with SMBJ40A-E3/5B and SAC40, SMBJ40AHE3/5B provides certified automotive reliability, 50 % higher surge power handling than SAC40, and maintains identical mounting compatibility with other SMBJ-series TVS diodes in existing layouts.
Availability
SMBJ40AHE3/5B is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor modules, and telecom line cards requiring stable component supply with full AEC-Q101 traceability and UL recognition.
Supply support for SMBJ40AHE3/5B 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, rectifiers, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom infrastructure where failure tolerance and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ40AHE3/5B at its rated peak pulse current?
The SMBJ40AHE3/5B has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM), measured using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in the Vishay datasheet revision 09-Jan-2024, page 2.
Is SMBJ40AHE3/5B suitable for automotive applications?
Yes, SMBJ40AHE3/5B is AEC-Q101 qualified, as indicated by the "HE3" suffix, and is explicitly rated for automotive use per Vishay's ordering information table. It supports operating junction temperatures from -55 °C to +150 °C and meets MSL Level 1 reflow requirements - making SMBJ40AHE3/5B appropriate for engine control, body electronics, and ADAS power domains.
What does the "5B" in SMBJ40AHE3/5B indicate?
The "5B" denotes the packaging configuration: 13-inch diameter plastic tape and reel, with a base quantity of 3200 units. This differs from "52", which specifies 7-inch reels of 750 units. The "HE3" portion confirms RoHS compliance and AEC-Q101 qualification, while "SMBJ40A" identifies the electrical grade (40 V VWM).
How does SMBJ40AHE3/5B compare to bidirectional variants like SMBJ40CA?
SMBJ40AHE3/5B is unidirectional and intended for DC rail protection with defined polarity; SMBJ40CA is bidirectional and suited for AC or differential signal lines. SMBJ40AHE3/5B offers lower leakage (1.0 µA vs. 2.0 µA for SMBJ40CA) and is optimized for asymmetric voltage threats - a key distinction when selecting SMBJ40AHE3/5B for single-supply systems.
What is the thermal resistance of SMBJ40AHE3/5B, and how does it affect layout design?
SMBJ40AHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads per terminal. This value assumes standard SMB footprint layout; reducing RθJA requires increased copper area or thermal vias. For sustained 5.0 W power dissipation, board-level thermal design must maintain TJ ≤ 150 °C - confirming SMBJ40AHE3/5B's suitability in thermally constrained automotive modules.
SMBJ40AHE3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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)
SMBJ40AHE3/5B FAQ
1.How can I place an order for SMBJ40AHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AHE3/5B 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 SMBJ40AHE3/5B reliable?
The price and inventory of SMBJ40AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40AHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ40AHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AHE3/5B?
SMBJ40AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AHE3/5B 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 SMBJ40AHE3/5B?
For technical support, including SMBJ40AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AHE3/5B requirements.
6.How does Aetrix verify that SMBJ40AHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ40AHE3/5B 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 SMBJ40AHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ40AHE3/5B?
All SMBJ40AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AHE3/5B, 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 SMBJ40AHE3/5B part is unused and in its original packaging.
Return procedure for SMBJ40AHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AHE3/5B Tags
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