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Vishay General Semiconductor - Diodes Division SMBJ40A-M3/52
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- Part No.:
- SMBJ40A-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40A-M3/52.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,617
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Product details
Overview
SMBJ40A-M3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in 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 handling per 10/1000 µs waveform - deployed to safeguard MOSFETs, ICs, and sensor interfaces in industrial motor drives and telecom power supplies.
For engineers reviewing the SMBJ40A-M3/52 datasheet, SMBJ40A-M3/52 pinout, SMBJ40A-M3/52 application, or SMBJ40A-M3/52 equivalent, key selection criteria include unidirectional polarity, SMB (DO-214AA) package compatibility, 150 °C max junction temperature, low incremental surge resistance, and halogen-free RoHS compliance per M3 suffix - all critical for automotive-qualified designs and high-reliability embedded systems.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below its 40 V stand-off voltage and rapidly transitions to low-impedance conduction when transient voltages exceed its 44.4–49.1 V breakdown threshold. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at VWM) and repeatable response across temperature.
The SMBJ40A-M3/52 delivers 600 W peak pulse power dissipation with a 10/1000 µs waveform and exhibits a 0.101 %/°C temperature coefficient of VBR, enabling predictable clamping behavior under thermal stress. Its 20 °C/W junction-to-lead thermal resistance supports reliable surge energy absorption without external heatsinking when mounted on standard 5.0 mm × 5.0 mm copper pads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 40 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe DC rail margin. |
| VBR (Breakdown Voltage) | 44.4–49.1 V at 1 mA - Confirmed minimum/maximum threshold where avalanche conduction initiates reliably. |
| VC (Clamping Voltage) | 64.5 V at 9.3 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines downstream component stress. |
| PPPM (Peak Pulse Power) | 600 W - Energy-handling capacity for standardized lightning/surge transients; validated per IEC 61000-4-5. |
| IPPM (Peak Pulse Current) | 9.3 A - Maximum surge current supported at rated clamping voltage; defines minimum series impedance needed. |
| TJmax | 150 °C - Maximum allowable junction temperature; enables operation in under-hood or enclosed industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 0.205" × 0.130" footprint; compatible with automated pick-and-place and reflow. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when voltage exceeds VBR. |
| Anode | Reference/return path | Typically tied to system ground or low-impedance return; completes clamping loop during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 Level 4 surge immunity (4 kV line-earth) without derating in standard PCB layouts. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in downstream ICs. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and JEDEC J-STD-20 MSL Level 1 for lead-free assembly. |
| 150 °C maximum junction temperature | Enables deployment in high-ambient environments such as industrial PLC backplanes and telecom rectifier modules. |
| Glass-passivated junction | Ensures stable VBR tolerance and <1.0 µA leakage at VWM, critical for low-power sensor front-ends. |
Applications
| Industrial Motor Drives | Telecom DC Power Supplies |
|---|---|
|
Use Scenario: Protection of gate drivers and bus voltage sense circuits against switching-induced voltage spikes from IGBT/MOSFET turn-off. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between gate-source or supply-rail and ground. Use Value: Limits transient excursions to ≤64.5 V, preventing gate oxide rupture in 600 V-class power semiconductors. |
Use Scenario: Input-stage surge suppression on +48 V telecom rectifier outputs exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC output rail prior to point-of-load converters. Use Value: Absorbs 600 W pulses without degradation, maintaining regulated output integrity during EN 61000-4-5 testing. |
| Automotive Body Control Modules | Industrial Sensor Signal Conditioning |
|
Use Scenario: Protection of LIN/CAN transceiver power pins against load dump and jump-start transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply rail upstream of LDO regulators. Use Value: Withstands 100 A surge (IFSM) and clamps to 64.5 V, ensuring transceiver survival during ISO 7637-2 Pulse 5a events. |
Use Scenario: ESD and EFT protection on analog inputs of 4–20 mA transmitter circuits in factory automation. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) unidirectional TVS on signal line referenced to local ground. Use Value: Maintains signal accuracy with sub-µA leakage while suppressing ±8 kV contact ESD per IEC 61000-4-2. |
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; RoHS-compliant but not halogen-free (E3 vs. M3). | Preferred for commercial-grade applications where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 qualification is unnecessary. |
| SMBJ40AHM3_B/H | Identical electrical and mechanical specs; adds AEC-Q101 qualification and 7" tape/reel packaging. | Required for automotive ECUs needing PPAP documentation and extended temperature validation. | Choose for automotive body electronics requiring certified reliability and traceable lot control. |
Compared with SMBJ40A-M3/52, the E3 variant offers identical surge performance at lower cost for non-automotive use, while the HM3_B/H version adds automotive qualification and different packaging - neither is pin-compatible drop-in replacement due to differing qualification status and reel configuration.
Availability
SMBJ40A-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom DC power supplies, and automotive body control modules requiring stable component supply with halogen-free compliance and commercial-grade reliability.
Supply support for SMBJ40A-M3/52 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, rectifiers, and protection devices with emphasis on high-reliability, high-efficiency solutions.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, telecom infrastructure, and automotive subsystems where consistent clamping performance and long-term stability are mandatory.
FAQ
What is the clamping voltage of SMBJ40A-M3/52 at its rated peak pulse current?
The SMBJ40A-M3/52 has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under a 10/1000 µs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ40A-M3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ40A-M3/52 suitable for automotive applications?
The SMBJ40A-M3/52 is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ40AHM3_B/H variant, which carries AEC-Q101 qualification and additional reliability testing. While SMBJ40A-M3/52 may function in benign automotive environments, it lacks the documented qualification required for safety-critical or production ECUs - always verify compliance requirements before selecting SMBJ40A-M3/52 for vehicle systems.
What does the "M3" suffix indicate in SMBJ40A-M3/52?
The "M3" suffix in SMBJ40A-M3/52 denotes halogen-free, RoHS-compliant construction meeting JEDEC J-STD-20 MSL Level 1 and JESD 201 Class 2 whisker resistance. It distinguishes the part from the "E3" (RoHS-compliant only) and "HM3" (AEC-Q101 qualified + halogen-free) variants. This marking confirms compliance with environmental regulations for commercial and industrial equipment without requiring automotive certification - an essential detail when managing material declarations and supply chain sustainability reporting for SMBJ40A-M3/52.
How does SMBJ40A-M3/52 compare to SMAJ40A in terms of surge capability?
The SMBJ40A-M3/52 provides 600 W peak pulse power, whereas the SMAJ40A is rated for 400 W - a 50 % higher surge energy handling capacity. This difference stems from the larger SMB (DO-214AA) package of SMBJ40A-M3/52 versus the smaller SMA (DO-214AC) outline of SMAJ40A. The SMBJ40A-M3/52 also offers lower thermal resistance (RθJL = 20 °C/W vs. ~30 °C/W for SMAJ), improving sustained surge survivability. Select SMBJ40A-M3/52 when higher pulse energy or improved thermal performance is required.
What is the maximum reverse leakage current for SMBJ40A-M3/52 at its stand-off voltage?
The SMBJ40A-M3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 40 V stand-off voltage (VWM) and 25 °C ambient temperature. This low leakage ensures minimal power loss in battery-powered or high-impedance sensing applications. Leakage remains below 5.0 µA up to 85 °C, supporting stable operation in industrial temperature ranges - a key parameter verified in the Vishay SMBJ5.0A–SMBJ188A datasheet revision 09-Jan-2024 for SMBJ40A-M3/52.
SMBJ40A-M3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ40A-M3/52 FAQ
1.How can I place an order for SMBJ40A-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40A-M3/52 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 SMBJ40A-M3/52 reliable?
The price and inventory of SMBJ40A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40A-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ40A-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40A-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40A-M3/52?
SMBJ40A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40A-M3/52 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 SMBJ40A-M3/52?
For technical support, including SMBJ40A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40A-M3/52 requirements.
6.How does Aetrix verify that SMBJ40A-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ40A-M3/52 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 SMBJ40A-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ40A-M3/52?
All SMBJ40A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40A-M3/52, 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 SMBJ40A-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ40A-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40A-M3/52 Tags
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