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Vishay General Semiconductor - Diodes Division SMBJ40D-M3/I
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- Part No.:
- SMBJ40D-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40D-M3/I.pdf
- Description:
- TVS DIODE 40VWM 63.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,600
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Product details
Overview
SMBJ40D-M3/I 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), 45.1–48.4 V breakdown voltage (VBR) at 1 mA, 63.6 V maximum clamping voltage (VC) at 9.43 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMBJ40D-M3/I datasheet, SMBJ40D-M3/I pinout, SMBJ40D-M3/I application, or SMBJ40D-M3/I equivalent, this device is selected for robust overvoltage protection in DC power rails, I/O interfaces, and MOSFET gate drivers where tight VBR tolerance (±3.5 %), low leakage (<0.5 μA at VWM), and MSL Level 1 reflow compatibility are critical.
Technical Context
The SMBJ40D-M3/I operates as a unidirectional avalanche diode, conducting only when reverse voltage exceeds its specified breakdown range. Its clamping action limits transient voltages to ≤63.6 V under 9.43 A surge, enabling reliable protection of downstream 3.3 V/5 V/12 V logic and power stages without latch-up or thermal runaway.
Thermal performance is defined by RθJA = 125 °C/W (on minimum pad) and RθJM = 20 °C/W, supporting operation up to TJ = 150 °C. The M3 suffix confirms halogen-free, RoHS-compliant construction with matte tin-plated leads qualified to JESD 201 Class 2 whisker resistance and J-STD-002 solderability standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail protection threshold. |
| VBR min/max | 45.1 V / 48.4 V at 1 mA - Tight ±3.5 % tolerance ensures predictable turn-on across production lots. |
| VC @ IPPM | 63.6 V at 9.43 A - Clamped voltage during 10/1000 μs surge; determines maximum stress on protected IC inputs. |
| PPPM | 600 W - Peak transient energy handling capability; supports repetitive surges at 0.01 % duty cycle. |
| ID @ VWM | <0.5 μA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensor circuits. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 2.20 mm height and 5.59 mm length; compatible with automated pick-and-place. |
| Operating TJ | -55 °C to +150 °C - Enables deployment in automotive under-hood, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case meeting UL 94 V-0 flammability rating. Cathode indicated by band at one end; anode is opposite terminal. Terminals are matte tin-plated for reliable solder joint formation per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode | Reference node | Typically tied to system ground or lowest potential reference point; completes clamping path. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Ensures consistent clamping onset across batches-critical for margin-critical 40 V rail protection. |
| 600 W peak pulse power (10/1000 μs) | Handles IEC 61000-4-5 Level 4 surges (4 kV, 2 Ω source) without degradation. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without popcorn or delamination risk. |
| <0.5 μA reverse leakage at 40 V | Minimizes standby power loss in always-on systems such as IoT sensors and battery-backed controllers. |
| Halogen-free, RoHS-compliant (M3) | Fulfills environmental compliance requirements for EU, China RoHS, and JEITA-MITI standards. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver ICs and microcontroller I/O pins against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional TVS placed between driver output and ground to clamp negative transients below -0.7 V and positive spikes above 40 V. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V logic while maintaining <0.5 μA leakage to avoid false wake-up in sleep mode. |
Use Scenario: Input protection for LIN bus transceivers and CAN interface power rails exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply line upstream of LDO regulators, absorbing 600 W pulses without affecting system reset timing. Use Value: Maintains functional safety integrity during ISO 7637-2 Pulse 5a (75 V/350 ms) by limiting clamped voltage to 63.6 V at full surge current. |
| Telecom Power Supplies | Consumer USB-C PD Adapters |
Use Scenario: Secondary-side overvoltage suppression on +48 V PoE injectors and PSE controllers subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping element on DC output rail, coordinated with upstream MOVs to share energy and extend lifetime. Use Value: Delivers 63.6 V clamping at 9.43 A with <1 ns response time-ensuring downstream DC-DC converters remain within absolute maximum ratings. |
Use Scenario: Input-stage transient suppression on 20 V USB-C PD input rails facing ESD and hot-plug overshoot. IC Role / Device Role / Timing Role: Unidirectional TVS between VBUS and GND, sized to absorb 8 kV contact ESD per IEC 61000-4-2 without derating. Use Value: Achieves <0.5 μA leakage at 20 V nominal, preserving efficiency in high-frequency flyback topologies while meeting UL 497B surge protector recognition. |
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-M3/I | Bidirectional variant; symmetric clamping in both polarities (VBR = 45.1–48.4 V, VC = 63.6 V). | Required for AC-coupled lines or differential buses where polarity reversal occurs (e.g., RS-485, Ethernet PHY). | Select SMBJ40A-M3/I only if bidirectional protection is needed; SMBJ40D-M3/I is optimal for DC rails with defined polarity. |
| SMCJ40A-M3/I | Larger SMC (DO-214AB) package; same VWM/VBR, but higher 1500 W PPPM and lower RθJA (65 °C/W). | Suitable for higher-energy surge environments (e.g., outdoor base stations, solar inverters) requiring extended thermal margin. | Choose SMCJ40A-M3/I when board space allows and surge energy exceeds 600 W; SMBJ40D-M3/I fits tighter layouts with adequate 600 W rating. |
Compared with SMBJ40A-M3/I and SMCJ40A-M3/I, the SMBJ40D-M3/I provides optimized unidirectional clamping in the smallest standardized SMB footprint, balancing surge robustness, thermal performance, and PCB area efficiency for cost-sensitive DC power protection.
Availability
SMBJ40D-M3/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for SMBJ40D-M3/I 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, precision, and automotive-grade qualification.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments, targeting applications demanding tight VBR tolerance, low leakage, and MSL Level 1 reflow compatibility across automotive, industrial, and telecom markets.
FAQ
What is the maximum clamping voltage of SMBJ40D-M3/I at its rated peak pulse current?
The SMBJ40D-M3/I has a maximum clamping voltage (VC) of 63.6 V at its rated peak pulse current (IPPM) of 9.43 A, measured using the standard 10/1000 μs double-exponential surge waveform. This value defines the upper voltage limit imposed on protected circuitry during worst-case transient events and is confirmed in Vishay's official datasheet revision 09-Jan-2024 (Document Number: 87606). The SMBJ40D-M3/I maintains this clamping performance across its full operating temperature range.
Is SMBJ40D-M3/I suitable for protecting 3.3 V logic interfaces?
No-SMBJ40D-M3/I is not suitable for direct protection of 3.3 V logic interfaces because its 40 V stand-off voltage (VWM) and 45.1 V minimum breakdown voltage (VBR) far exceed the absolute maximum ratings of typical 3.3 V ICs. It is intended for higher-voltage rails such as 12 V, 24 V, or 48 V systems. For 3.3 V logic, lower-voltage TVS devices like SMBJ3.3A or SMAJ3.3A must be used. The SMBJ40D-M3/I is correctly applied on power distribution networks upstream of regulators feeding those logic stages.
Does SMBJ40D-M3/I meet automotive qualification standards?
The SMBJ40D-M3/I is not AEC-Q200 qualified as a standalone part; however, it meets key automotive-relevant specifications including MSL Level 1 (260 °C peak reflow), -55 °C to +150 °C operating junction temperature, and UL 497B recognition for surge protectors. Many Tier 1 suppliers use SMBJ40D-M3/I in non-safety-critical automotive subsystems (e.g., body electronics) with internal qualification. For AEC-Q200–mandated applications, Vishay offers the AEC-Q200–qualified SMBJ40DHE3_M3/848, which shares identical electrical specs but adds automotive-specific testing and traceability. The SMBJ40D-M3/I remains widely deployed in automotive designs where full qualification is not contractually required.
What is the meaning of the "M3" suffix in SMBJ40D-M3/I?
The "M3" suffix in SMBJ40D-M3/I denotes Vishay's industrial-grade, halogen-free, and RoHS-compliant construction. It specifies matte tin-plated terminals qualified to JESD 201 Class 2 for whisker resistance and J-STD-002 for solderability, along with molding compound compliant with UL 94 V-0 flammability rating. The "I" indicates packaging in 13-inch tape-and-reel format with 3200 units per reel. This suffix differentiates the part from legacy non-RoHS or non-halogen-free variants and confirms suitability for modern lead-free assembly processes. The SMBJ40D-M3/I meets environmental and process requirements for global electronics manufacturing.
How does SMBJ40D-M3/I compare to SMAJ40A in terms of package and performance?
The SMBJ40D-M3/I uses the SMB (DO-214AA) package (5.59 mm × 4.06 mm), while SMAJ40A uses the smaller SMA (DO-214AC) package (4.57 mm × 2.92 mm). Both share identical VWM (40 V), VBR (45.1–48.4 V), and VC (63.6 V), but SMBJ40D-M3/I delivers higher peak pulse power (600 W vs. 400 W for SMAJ40A) and superior thermal resistance (RθJA = 125 °C/W vs. 150 °C/W). The SMBJ40D-M3/I is preferred for higher-energy transients and better thermal margin; SMAJ40A suits ultra-compact layouts where 400 W suffices. The SMBJ40D-M3/I also features tighter VBR tolerance (±3.5 % vs. ±5 % for SMAJ40A).
SMBJ40D-M3/I 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):
- 45.1V
- Voltage - Clamping (Max) @ Ipp:
- 63.6V
- Current - Peak Pulse (10/1000µs):
- 9.43A
- 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)
SMBJ40D-M3/I FAQ
1.How can I place an order for SMBJ40D-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40D-M3/I 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 SMBJ40D-M3/I reliable?
The price and inventory of SMBJ40D-M3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40D-M3/I is usually 5 days.
3.What payment methods are accepted for SMBJ40D-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40D-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40D-M3/I?
SMBJ40D-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40D-M3/I 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 SMBJ40D-M3/I?
For technical support, including SMBJ40D-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40D-M3/I requirements.
6.How does Aetrix verify that SMBJ40D-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40D-M3/I 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 SMBJ40D-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ40D-M3/I?
All SMBJ40D-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40D-M3/I, 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 SMBJ40D-M3/I part is unused and in its original packaging.
Return procedure for SMBJ40D-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40D-M3/I Tags
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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