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Vishay General Semiconductor - Diodes Division SMBJ40-E3/5B
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- Part No.:
- SMBJ40-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40-E3/5B.pdf
- Description:
- TVS DIODE 40VWM 71.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,892
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Product details
Overview
SMBJ40-E3/5B 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 power and signal lines. It features 40 V stand-off voltage (VWM), 44.4–49.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), 9.3 A peak pulse current (IPPM), and clamps to ≤64.5 V at rated surge current - deployed in industrial motor drives, automotive body control modules, and DC power input protection.
For engineers reviewing the SMBJ40-E3/5B datasheet, SMBJ40-E3/5B pinout, SMBJ40-E3/5B application, or SMBJ40-E3/5B equivalent, this page delivers verified electrical parameters, thermal derating behavior, junction-to-lead thermal resistance, RoHS-compliant commercial-grade qualification, and direct alternative part comparisons for ESD/surge protection design-in.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for stable avalanche response. Its 100 °C/W junction-to-ambient thermal resistance (RθJA) and 20 °C/W junction-to-lead (RθJL) support reliable operation under repetitive surge conditions when mounted on 5.0 mm × 5.0 mm copper pads.
The SMBJ40-E3/5B meets MSL Level 1 per J-STD-020 (260 °C peak reflow), has <1.0 μA reverse leakage at 40 V, and exhibits a +0.101 %/°C temperature coefficient of VBR - enabling predictable clamping voltage drift across -55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - guaranteed avalanche initiation window; ensures consistent turn-on during transient events |
| VC @ IPPM | ≤64.5 V at 9.3 A - clamped voltage under 10/1000 μs surge; determines maximum stress imposed on downstream ICs |
| PPPM | 600 W - peak pulse power handling capability; validates robustness against IEC 61000-4-5 Level 4 surges |
| ID @ VWM | ≤1.0 μA - ultra-low reverse leakage; preserves efficiency in battery-powered or high-impedance sensor circuits |
| TJ max. | +150 °C - maximum junction temperature; supports operation in under-hood automotive and industrial enclosures |
| RθJL | 20 °C/W - low junction-to-lead thermal resistance; enables effective heat transfer to PCB copper during surge dissipation |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, matte tin-plated leads, RoHS-compliant commercial grade (E3 suffix), MSL Level 1 compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Anode-side connection point in unidirectional configuration | Connected to protected line; clamps positive transients to ground when reverse-biased |
| Anode (non-banded end) | Reference/ground return path | Typically tied to system ground or low-impedance return plane; completes clamping current path |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Supports IEC 61000-4-5 surge immunity up to 4 kV (line-earth) without degradation |
| Glass passivated chip junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure |
| Low profile SMB package | Enables automated placement in space-constrained designs such as automotive ECUs and IoT edge nodes |
| MSL Level 1 rating (260 °C peak) | Eliminates pre-baking requirement for standard SMT reflow processes |
| RoHS-compliant, commercial grade (E3) | Meets global environmental compliance mandates without halogen-free cost premium |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 24 V DC input rails against inductive kickback from relay coils and solenoid drivers. IC Role / Device Role / Timing Role: Unidirectional TVS placed between VIN and GND to clamp transients exceeding 40 V. Use Value: Limits voltage seen by upstream DC-DC converters and microcontrollers to ≤64.5 V, preventing latch-up or gate oxide damage. |
Use Scenario: Surge suppression on LIN bus power supply lines exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V rail feeding LIN transceivers and local sensors. Use Value: Maintains <1.0 μA leakage at 40 V, avoiding false wake-up or battery drain in sleep mode. |
| Consumer Power Adapters | Telecom DC Feeds |
Use Scenario: Secondary-side overvoltage protection in 5 V/12 V AC-DC adapters subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response clamping device parallel to output capacitor on regulated DC output. Use Value: Achieves <1 ns response time to limit transient propagation to connected USB peripherals or display controllers. |
Use Scenario: Input-stage protection for PoE-powered network switches handling 48 V DC feeds. IC Role / Device Role / Timing Role: Primary surge limiter on 48 V input before DC-DC isolation stage. Use Value: Withstands 600 W pulses without parameter shift, ensuring multi-year field reliability in telecom infrastructure. |
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-E3/52 | Same electrical specs; differs only in tape-and-reel packaging (750 pcs vs. 3200 pcs on 13" reel) | No functional difference; suited for lower-volume prototyping or small-batch production | Select SMBJ40A-E3/52 if demand volume aligns with 750-unit reels and logistics favor smaller reels. |
| P6SMB40A | Identical VWM (40 V), VC (64.5 V), and PPPM (600 W); same SMB package but manufactured by ON Semiconductor | Validated in automotive AEC-Q101-qualified designs where dual-sourcing is required | Choose P6SMB40A when cross-qualification with ON Semi's automotive-grade variant is needed for supply chain resilience. |
Compared with SMBJ40-E3/5B, SMBJ40A-E3/52 offers identical protection performance in a smaller reel format, while P6SMB40A provides second-source assurance with matching clamping behavior and SMB footprint - both avoid layout changes and preserve thermal performance.
Availability
SMBJ40-E3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and consumer power adapters requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ40-E3/5B 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, MOSFETs, and protection devices with emphasis on reliability and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, lightning, and inductive switching surges is critical.
FAQ
What is the maximum clamping voltage of SMBJ40-E3/5B at its rated peak pulse current?
The SMBJ40-E3/5B clamps to a maximum of 64.5 V when subjected to its rated 9.3 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured at the device terminals and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ40-E3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No, SMBJ40-E3/5B is RoHS-compliant commercial grade (E3 suffix) and not AEC-Q101 qualified. For automotive use, select the Vishay variant SMBJ40HE3_B/I, which carries the HE3 suffix and explicit AEC-Q101 qualification per the ordering table in Document 88392 - SMBJ40-E3/5B must not be used in safety-critical or under-hood automotive systems without requalification.
What is the thermal resistance from junction to lead (RθJL) for SMBJ40-E3/5B, and why does it matter?
The SMBJ40-E3/5B has a typical RθJL of 20 °C/W, indicating efficient heat conduction from the silicon junction to the device leads. This parameter directly impacts sustained surge handling: lower RθJL allows faster dissipation of transient energy into the PCB copper, reducing thermal stress during repetitive surges and extending device lifetime in high-duty-cycle applications like industrial PLC I/O modules.
How does the 1.0 μA maximum reverse leakage at 40 V affect system-level power budgeting?
The SMBJ40-E3/5B's ≤1.0 μA reverse leakage at VWM (40 V) minimizes standby current draw in always-on systems such as smart meters or battery-backed security sensors. This ultra-low leakage ensures negligible impact on battery life or quiescent power targets - especially critical when multiple TVS devices are deployed across a large BOM in energy-sensitive designs.
Can SMBJ40-E3/5B be used in bidirectional transient protection applications?
No - SMBJ40-E3/5B is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection (e.g., AC lines or differential data buses), Vishay specifies the CA-suffixed variant SMBJ40CA. Using SMBJ40-E3/5B in bidirectional configurations risks forward conduction during negative transients and failure to clamp - always match device polarity to signal topology.
SMBJ40-E3/5B 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ40-E3/5B FAQ
1.How can I place an order for SMBJ40-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40-E3/5B 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 SMBJ40-E3/5B reliable?
The price and inventory of SMBJ40-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ40-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40-E3/5B?
SMBJ40-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40-E3/5B 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 SMBJ40-E3/5B?
For technical support, including SMBJ40-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40-E3/5B requirements.
6.How does Aetrix verify that SMBJ40-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ40-E3/5B 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 SMBJ40-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ40-E3/5B?
All SMBJ40-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40-E3/5B, 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 SMBJ40-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ40-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40-E3/5B Tags
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