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Vishay General Semiconductor - Diodes Division SMBJ40AHM3/H
- Part No.:
- SMBJ40AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AHM3/H.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,618
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Product details
Overview
SMBJ40AHM3/H 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), 64.5 V maximum clamping voltage at 9.3 A peak pulse current (IPPM), and 600 W peak pulse power capability with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ40AHM3/H datasheet, SMBJ40AHM3/H pinout, SMBJ40AHM3/H application, or SMBJ40AHM3/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 100 °C/W) for board-level surge protection design.
Technical Context
This TVS diode operates as a voltage-clamping device triggered by reverse-biased avalanche breakdown above its stand-off voltage. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at 40 V), while the 10/1000 µs waveform rating reflects standardized lightning/surge immunity testing per ANSI/IEEE C62.35.
The SMBJ40AHM3/H is rated for -55 °C to +150 °C operating junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its 20 °C/W junction-to-lead thermal resistance supports localized heat dissipation during transient events without requiring external heatsinking under typical PCB pad layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 44.4 V / 49.1 V at 1.0 mA - guaranteed breakdown voltage window defining turn-on threshold |
| VC @ IPPM | 64.5 V at 9.3 A - clamped voltage seen by protected circuit during 10/1000 µs surge |
| PPPM | 600 W - peak transient energy absorption capacity under standard surge waveform |
| ID @ VWM | ≤1.0 µA - ultra-low reverse leakage preserving signal integrity and power efficiency |
| TJ max | +150 °C - enables reliable operation in high-temperature industrial environments |
| RθJA | 100 °C/W - thermal resistance indicating junction-to-ambient heating under steady-state conditions |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads solderable per J-STD-002. Cathode indicated by band marking on cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side of protected line; enables forward conduction only during fault conditions |
| Cathode | Avalanche clamping terminal | Banded end; connected to higher-potential side; conducts reverse current when VRM exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) without degradation |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Halogen-free & RoHS | Complies with JEDEC JESD201 Class 2 whisker resistance and environmental regulations |
| Low profile SMB package | Enables automated placement and fits compact layouts where height < 2.2 mm is required |
| Fast response time | Sub-nanosecond clamping onset protects sensitive CMOS inputs from ESD and switching spikes |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoids. IC Role / Device Role / Timing Role: Unidirectional TVS placed across DC bus or control line to clamp transients before they reach logic-level components. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V MCU pins and MOSFET gate oxides during 100 V+ switching events. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Standoff-rated clamping device absorbing ISO 7637-2 Pulse 1/2a/5a energy without affecting signal timing. Use Value: Maintains signal fidelity below 40 V while limiting transient overshoot to ≤64.5 V, ensuring ASIL-B functional safety compliance. |
| Power Supply Input Stages | Industrial Sensor Interface Boards |
Use Scenario: Secondary-side overvoltage protection on 24 V DC input rails feeding isolated DC/DC converters. IC Role / Device Role / Timing Role: Parallel-connected clamping element that activates only during abnormal line surges, not during normal regulation. Use Value: Limits voltage excursion to safe levels for downstream regulators and optocouplers without loading the nominal 24 V rail. |
Use Scenario: Reverse polarity and transient protection on analog output lines (e.g., 4–20 mA transmitters) in factory automation systems. IC Role / Device Role / Timing Role: Unidirectional shunt protector placed between signal line and ground to divert induced noise away from precision DACs. Use Value: Enables operation down to -55 °C ambient while maintaining <1 µA leakage to preserve loop accuracy and long-term calibration stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40AHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Acceptable where halogen content is unrestricted; identical footprint and thermal performance | Select SMBJ40AHM3/H when halogen-free compliance is mandated by OEM or regional environmental policy |
| SMBJ40CAHM3/H | Bidirectional variant with symmetric clamping; VBR = 44.4–49.1 V, same VC and PPPM | Required for AC-coupled or dual-polarity signal lines (e.g., RS-485, CAN FD); not suitable for DC-only protection | Choose SMBJ40CAHM3/H only if bidirectional surge immunity is needed; otherwise SMBJ40AHM3/H offers lower leakage and simpler biasing |
Compared with SMBJ40AHE3/H, SMBJ40AHM3/H adds halogen-free construction without sacrificing surge rating or thermal performance; versus SMBJ40CAHM3/H, it provides superior reverse leakage control and simplified DC circuit integration at the cost of unidirectional-only protection.
Availability
SMBJ40AHM3/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and power supply input stages requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ40AHM3/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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure due to voltage surges must be eliminated through proven clamping performance and qualification rigor.
FAQ
What is the clamping voltage of SMBJ40AHM3/H at its rated peak pulse current?
The SMBJ40AHM3/H has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 9.3 A under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on the protected circuit during surge events and is measured with the device mounted on 0.2" × 0.2" copper pads per JEDEC standards. The SMBJ40AHM3/H maintains this clamping performance across its full operating temperature range.
Is SMBJ40AHM3/H qualified for automotive applications?
Yes, SMBJ40AHM3/H is AEC-Q101 qualified, meaning it has passed stress tests including high-temperature reverse bias, temperature cycling, and ESD per automotive reliability requirements. The "HM3" suffix confirms halogen-free, RoHS-compliant construction with AEC-Q101 validation - making SMBJ40AHM3/H suitable for use in body control modules, lighting systems, and infotainment power supplies where automotive-grade assurance is mandatory.
How does the SMBJ40AHM3/H differ from the SMBJ40AHE3/H variant?
The SMBJ40AHM3/H and SMBJ40AHE3/H share identical electrical specifications, package, and AEC-Q101 qualification, but differ in material composition: SMBJ40AHM3/H is halogen-free, while SMBJ40AHE3/H is RoHS-compliant without halogen restriction. Both meet JESD201 Class 2 whisker resistance and have identical thermal resistance (RθJA = 100 °C/W). SMBJ40AHM3/H is selected when halogen-free compliance is required by OEM or regulatory mandate.
What is the maximum reverse leakage current for SMBJ40AHM3/H at its stand-off voltage?
The SMBJ40AHM3/H exhibits a maximum reverse leakage current (ID) of 1.0 µA at its rated stand-off voltage (VWM) of 40 V and ambient temperature of 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes standby power loss in always-on industrial control circuits. Leakage remains within specification up to +150 °C junction temperature per datasheet derating curves.
Can SMBJ40AHM3/H be used in bidirectional signal protection applications?
No - SMBJ40AHM3/H is a unidirectional TVS diode, intended for DC or single-polarity line protection where the cathode is biased positively relative to the anode. For bidirectional signal lines such as RS-485, CAN, or AC-coupled audio, the bidirectional variant SMBJ40CAHM3/H must be used instead. Using SMBJ40AHM3/H on bidirectional lines risks forward conduction during negative half-cycles and potential device failure.
SMBJ40AHM3/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:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ40AHM3/H FAQ
1.How can I place an order for SMBJ40AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AHM3/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 SMBJ40AHM3/H reliable?
The price and inventory of SMBJ40AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40AHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ40AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AHM3/H?
SMBJ40AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AHM3/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 SMBJ40AHM3/H?
For technical support, including SMBJ40AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AHM3/H requirements.
6.How does Aetrix verify that SMBJ40AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ40AHM3/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 SMBJ40AHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ40AHM3/H?
All SMBJ40AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AHM3/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 SMBJ40AHM3/H part is unused and in its original packaging.
Return procedure for SMBJ40AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AHM3/H Tags
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