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Vishay General Semiconductor - Diodes Division SMBJ40D-M3/H
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- Part No.:
- SMBJ40D-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40D-M3/H.pdf
- Description:
- TVS DIODE 40VWM 63.6VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:18,292
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Product details
Overview
SMBJ40D-M3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive load switching surges and lightning-induced transients on 40 V DC power rails and signal lines. It delivers 600 W peak pulse power (10/1000 μs), has a 45.1–48.4 V breakdown voltage at 1 mA, clamps to ≤63.6 V at 9.43 A, and exhibits only 0.5 μA max reverse leakage at 40 V standoff.
For engineers reviewing the SMBJ40D-M3/H datasheet, SMBJ40D-M3/H pinout, SMBJ40D-M3/H application, or SMBJ40D-M3/H equivalent, this page provides verified electrical parameters, thermal derating behavior, clamping performance under standardized surge waveforms, polarity marking convention, and direct alternatives with documented VBR, VC, and IPPM alignment.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, activated when reverse voltage exceeds its specified VBR range (45.1–48.4 V). Its low incremental surge resistance ensures minimal voltage overshoot during 10/1000 μs transients, while the M3 suffix confirms halogen-free, RoHS-compliant construction meeting JESD 201 Class 2 whisker resistance and J-STD-020 MSL Level 1 reflow compatibility.
The device is rated for 150 °C maximum junction temperature and features a thermal resistance of 125 °C/W (junction-to-ambient, mounted on minimum pad layout). Its 40 V working maximum (VWM) and 63.6 V clamping voltage (VC) at 9.43 A define its protection window for 36–44 V nominal systems, such as automotive body control modules and industrial 48 V DC inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 45.1 V / 48.4 V at 1.0 mA - defines reliable turn-on threshold across manufacturing lot and temperature |
| VWM | 40 V - maximum continuous reverse voltage before significant leakage; sets system operating margin |
| VC @ IPPM | ≤63.6 V at 9.43 A - clamping voltage during 600 W 10/1000 μs surge; determines protected IC's voltage stress |
| IPPM | 9.43 A - peak surge current capability under standard waveform; used for PCB trace sizing and fuse coordination |
| PPPM | 600 W - peak pulse power rating per 10/1000 μs waveform; defines transient energy absorption capacity |
| ID @ VWM | ≤0.5 μA - ultra-low reverse leakage at 40 V; critical for battery-powered or high-impedance sensor interfaces |
| TJ max | 150 °C - maximum junction temperature; governs thermal design and derating above 25 °C ambient |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by a band on the case end; polarity must be observed for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms clamping path when cathode is at higher transient voltage |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 40 V rail); absorbs positive transients by avalanche conduction to anode |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise overvoltage protection window without oversizing downstream components |
| 600 W peak pulse power (10/1000 μs) | Supports robust immunity against IEC 61000-4-5 Level 3/4 surges in industrial and automotive environments |
| MSL Level 1, 260 °C peak reflow | Allows single-pass lead-free assembly without moisture sensitivity concerns or baking requirements |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance mandates for global OEM production and end-of-life recycling |
| Low 0.5 μA leakage at VWM | Preserves battery life and avoids false triggering in high-impedance monitoring circuits |
Applications
| Automotive Body Control Module | Industrial 48 V DC Power Input |
|---|---|
|
Use Scenario: Protecting microcontroller I/O and CAN transceiver power rails from load dump and alternator ripple in vehicle door modules. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between 40 V supply and ground to shunt transients exceeding VWM. Use Value: Limits voltage seen by 48 V-rated MCUs to ≤63.6 V during 100 ms load dump events, preventing latch-up or oxide damage. |
Use Scenario: Safeguarding programmable logic controllers (PLCs) receiving 48 V DC from centralized power supplies subject to inductive switching noise. IC Role / Device Role / Timing Role: Primary surge suppression element at main DC input connector, upstream of bulk capacitance and LDOs. Use Value: Absorbs 600 W surges without degradation, maintaining <0.5 μA standby leakage to avoid unnecessary power loss in always-on systems. |
| Telecom Remote Radio Unit | Consumer Smart Home Hub Power Rail |
|
Use Scenario: Shielding RF front-end bias lines and digital control signals in outdoor base station radios exposed to lightning-induced coupling. IC Role / Device Role / Timing Role: Point-of-load TVS on +40 V bias rail feeding power amplifiers and analog front-end ICs. Use Value: Clamps 10/1000 μs surges within 1 ns response time, preserving signal integrity and preventing gate oxide rupture in GaN FET drivers. |
Use Scenario: Securing USB-C PD negotiation circuitry and PMIC inputs in smart home hubs powered via 40 V PoE++ injectors. IC Role / Device Role / Timing Role: Secondary protection stage after primary MOV, placed directly at PMIC VIN pin. Use Value: Provides precise 40 V standoff and sub-64 V clamping to meet UL 62368-1 transient immunity requirements without overdesigning input capacitors. |
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-M3/5B (Vishay) | Same VBR (45.1–48.4 V), identical package and ratings; differs only in tape-and-reel packaging code (5B vs. H) | No functional difference; suitable for same PCB layouts and thermal designs | Select based on preferred reel size (750 vs. 3200 units) and logistics requirements |
| SMCJ40A (Littelfuse) | Higher package thermal resistance (RθJA = 150 °C/W vs. 125 °C/W); same VWM/VC but lower IPPM (8.7 A vs. 9.43 A) at 600 W | Requires larger copper pour or additional thermal relief for equivalent power dissipation | Use only if SMCJ footprint is already established; verify thermal margin at 100 kHz surge repetition |
Compared with SMBJ40D-M3/H, SMBJ40A-M3/5B offers identical electrical and thermal performance in alternate packaging, while SMCJ40A requires thermal redesign due to higher junction-to-ambient resistance and delivers slightly lower surge current handling despite matching peak power rating.
Availability
SMBJ40D-M3/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial 48 V DC power inputs, and telecom remote radio units requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ40D-M3/H 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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMBJ series was engineered specifically for surface-mount transient suppression in space-constrained, high-surge environments-emphasizing tight VBR tolerance, low leakage, and robust MSL Level 1 reflow capability.
FAQ
What is the breakdown voltage range of SMBJ40D-M3/H?
The SMBJ40D-M3/H has a guaranteed breakdown voltage (VBR) range of 45.1 V to 48.4 V at 1.0 mA test current, measured per ANSI/IEEE C62.35 standards. This ±3.5 % tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage margining in 40 V systems. The value is confirmed in Vishay Document Number 87606, Revision 09-Jan-2024.
How does SMBJ40D-M3/H differ from bidirectional variants like SMBJ40CD?
The SMBJ40D-M3/H is unidirectional, with a cathode band indicating polarity and clamping only positive transients relative to ground. In contrast, SMBJ40CD is bidirectional-lacking a cathode band-and clamps both polarities symmetrically. SMBJ40D-M3/H is used where polarity is fixed (e.g., DC power rails), while SMBJ40CD suits AC-coupled or floating signal lines. Both share identical VWM, VC, and PPPM specs.
What is the maximum clamping voltage of SMBJ40D-M3/H under surge conditions?
The SMBJ40D-M3/H clamps to a maximum of 63.6 V when subjected to its rated 9.43 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This clamping voltage defines the upper voltage limit imposed on protected circuitry during transient events and is measured at TA = 25 °C per Vishay's test methodology in Document 87606.
Is SMBJ40D-M3/H compatible with lead-free reflow soldering processes?
Yes, SMBJ40D-M3/H meets J-STD-020 MSL Level 1 and supports peak reflow temperatures up to 260 °C, making it fully compatible with standard lead-free soldering profiles. Its M3 suffix certifies halogen-free, RoHS-compliant construction and JESD 201 Class 2 whisker resistance-ensuring reliability in automated SMT assembly without pre-baking.
What thermal derating applies to SMBJ40D-M3/H above 25 °C ambient?
SMBJ40D-M3/H power dissipation derates linearly above 25 °C ambient: its 1.0 W rating at TA = 25 °C decreases by 8 mW/°C (based on RθJA = 125 °C/W on minimum pad layout). At 85 °C ambient, usable power drops to ~0.52 W. Derating curves are provided in Figure 5 of Vishay Document 87606 for accurate thermal design validation.
SMBJ40D-M3/H 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/H FAQ
1.How can I place an order for SMBJ40D-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40D-M3/H 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/H reliable?
The price and inventory of SMBJ40D-M3/H 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/H is usually 5 days.
3.What payment methods are accepted for SMBJ40D-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40D-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40D-M3/H?
SMBJ40D-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40D-M3/H 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/H?
For technical support, including SMBJ40D-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40D-M3/H requirements.
6.How does Aetrix verify that SMBJ40D-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ40D-M3/H 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/H meets industry standards.
7.What is the process for return or replacement of SMBJ40D-M3/H?
All SMBJ40D-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40D-M3/H, 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/H part is unused and in its original packaging.
Return procedure for SMBJ40D-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40D-M3/H Tags
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