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Vishay General Semiconductor - Diodes Division SMBJ40A-M3/5B
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- Part No.:
- SMBJ40A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40A-M3/5B.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,339
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Product details
Overview
SMBJ40A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and ESD events on power 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, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, microcontrollers, and sensor interfaces in industrial power supplies and telecom line cards.
For engineers reviewing the SMBJ40A-M3/5B datasheet, SMBJ40A-M3/5B pinout, SMBJ40A-M3/5B application, or SMBJ40A-M3/5B equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature, halogen-free RoHS compliance (M3 suffix), and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamping protection device: under normal conditions it presents high impedance (>1 GΩ) below VWM = 40 V, then rapidly transitions to low-impedance conduction when transient voltage exceeds VBR (min 44.4 V). Its glass-passivated junction ensures stable avalanche characteristics and fast response time (<1 ns).
The SMBJ40A-M3/5B is rated for 600 W peak pulse power (10/1000 µs), 100 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits 0.101 %/°C temperature coefficient of VBR. Thermal resistance is 100 °C/W junction-to-ambient (on 5.0 mm × 5.0 mm copper pads), supporting reliable operation in compact, thermally constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before clamping begins; defines safe operating margin for 36–40 V DC rails. |
| VBR (min/max) | 44.4 V / 49.1 V at IT = 1 mA - Ensures consistent avalanche initiation across production lot; critical for predictable clamping threshold. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 600 W transient; limits downstream IC stress to safe levels under worst-case surge. |
| IPPM | 9.3 A - Peak pulse current capability with 10/1000 µs waveform; determines survivability against IEC 61000-4-5 Level 4 surges. |
| PPPM | 600 W - Peak pulse power handling; enables robust protection without derating in typical 1–2 cm² PCB copper area layouts. |
| TJ range | -55 °C to +150 °C - Supports operation in automotive under-hood, industrial motor drives, and outdoor telecom enclosures. |
| Leakage @ VWM | ≤1.0 µA - Minimizes standby power loss and avoids false triggering in high-impedance sensor bias networks. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, MSL Level 1 (260 °C reflow peak), polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes clamping path during overvoltage events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 40 V rail or signal trace); blocks reverse current until VBR exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 surge test Level 4 (4 kV/2 Ω) on 40 V systems without external series impedance. |
| Glass passivated junction | Ensures stable, repeatable avalanche characteristics over 1000+ surge events and lifetime temperature cycling. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ESD >15 kV), improving clamping precision. |
| MSL Level 1 moisture sensitivity | Eliminates bake-out requirement prior to reflow; supports direct placement into high-volume SMT lines without dry pack handling. |
| Halogen-free, RoHS-compliant (M3) | Meets IPC-1752A material declaration requirements for green electronics manufacturing and end-of-life recycling. |
Applications
| Industrial Motor Drive Power Supply | Telecom Line Card Protection |
|---|---|
|
Use Scenario: Suppresses inductive kickback from relay coils and gate drivers in 48 V DC bus sections. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed across MOSFET drain-source or relay coil terminals. Use Value: Limits transient voltage to ≤64.5 V, preventing gate oxide rupture in 60 V-rated power MOSFETs and ensuring system-level IEC 61000-4-4 compliance. |
Use Scenario: Protects Ethernet PHY interface and PoE controller ICs from lightning-induced surges on RJ45 ports. IC Role / Device Role / Timing Role: Primary-level TVS on differential pairs (e.g., TX+/TX−) referenced to chassis ground. Use Value: Clamps 10/1000 µs surges up to 600 W while maintaining <1.0 µA leakage at 40 V, avoiding signal integrity degradation in 100BASE-TX links. |
| Automotive Body Control Module (BCM) | Consumer Appliance Mainboard |
|
Use Scenario: Shields LIN bus transceivers and microcontroller I/O pins from load dump and jump-start transients in 12 V systems. IC Role / Device Role / Timing Role: Secondary protection stage after upstream fuse and PTC, placed adjacent to protected IC. Use Value: Withstands 150 °C junction temperature and meets AEC-Q101 qualification (via HM3 variant), enabling under-hood deployment. |
Use Scenario: Guards AC-DC converter output rails and microcontroller reset lines against ESD and capacitor discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 3.3 V, 5 V, and 40 V auxiliary rails feeding MCU, display, and motor drivers. Use Value: 40 V VWM provides 20 % margin above nominal 33 V rail, while 64.5 V VC ensures safe headroom for 75 V surge immunity 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-E3/5B | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable for commercial-grade products where halogen-free mandate does not apply. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not needed. |
| SMBJ40CA-M3/5B | Bidirectional version; symmetric VBR = 44.4–49.1 V, same VC = 64.5 V, but no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where reverse polarity surges occur. | Choose only if bidirectional clamping is explicitly required; unidirectional SMBJ40A-M3/5B is optimal for DC rails. |
Compared with SMBJ40A-E3/5B, the M3 variant adds halogen-free compliance without performance trade-offs; compared with SMBJ40CA-M3/5B, the unidirectional configuration offers tighter leakage control and simpler layout integration on grounded DC systems.
Availability
SMBJ40A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom line cards, automotive body control modules, and consumer appliance mainboards requiring stable component supply and halogen-free compliance.
Supply support for SMBJ40A-M3/5B 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, TVS devices, and optoelectronics with emphasis on reliability, power efficiency, and AEC-Q qualified solutions.
The SMBJ series was developed for high-energy transient suppression in space-constrained surface-mount applications, targeting industrial automation, automotive electronics, and communications infrastructure where robustness and repeatability are critical.
FAQ
What is the maximum clamping voltage of SMBJ40A-M3/5B under a 600 W transient?
The SMBJ40A-M3/5B has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current, measured with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and ensures downstream components see no more than 64.5 V during standardized surge events. The SMBJ40A-M3/5B maintains this clamping performance due to its low incremental surge resistance and stable avalanche junction.
Is SMBJ40A-M3/5B suitable for automotive applications?
The SMBJ40A-M3/5B itself is commercial-grade (M3 suffix), but Vishay offers the AEC-Q101 qualified variant SMBJ40A-HM3/5B with identical electrical specs and halogen-free construction. For automotive use, specify the HM3 suffix; the SMBJ40A-M3/5B is appropriate for non-automotive industrial and telecom applications where AEC-Q101 is not mandated.
How does the M3 suffix differ from E3 in SMBJ40A-M3/5B?
The M3 suffix denotes halogen-free, RoHS-compliant construction using bromine-free flame retardants in the molding compound, whereas E3 uses RoHS-compliant materials that may contain halogens. Both meet JEDEC J-STD-020 MSL Level 1 and have identical electrical ratings. The SMBJ40A-M3/5B satisfies strict environmental mandates like IPC-1752A and EU RoHS Annex II updates requiring halogen-free content.
What is the thermal resistance of SMBJ40A-M3/5B, and how does it affect PCB layout?
The SMBJ40A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain TJ ≤ 150 °C at full 5.0 W steady-state dissipation, designers must provide adequate copper area and avoid excessive ambient temperature. The SMBJ40A-M3/5B's low RθJL = 20 °C/W also supports localized heat sinking via thermal vias to inner layers.
Can SMBJ40A-M3/5B be used in bidirectional signal protection?
No - SMBJ40A-M3/5B is unidirectional and conducts only when cathode voltage exceeds anode by ≥VBR. For bidirectional protection (e.g., AC lines, differential buses), use SMBJ40CA-M3/5B, which has symmetric breakdown in both polarities. Using SMBJ40A-M3/5B on bidirectional signals risks forward conduction during negative transients, potentially damaging the device or circuit. Always match polarity to system grounding architecture.
SMBJ40A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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-M3/5B FAQ
1.How can I place an order for SMBJ40A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40A-M3/5B 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 SMBJ40A-M3/5B reliable?
The price and inventory of SMBJ40A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ40A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40A-M3/5B?
SMBJ40A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40A-M3/5B 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 SMBJ40A-M3/5B?
For technical support, including SMBJ40A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40A-M3/5B requirements.
6.How does Aetrix verify that SMBJ40A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ40A-M3/5B 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 SMBJ40A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ40A-M3/5B?
All SMBJ40A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40A-M3/5B, 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 SMBJ40A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ40A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40A-M3/5B Tags
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