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Vishay General Semiconductor - Diodes Division SMBJ40AHM3_B/H
- Part No.:
- SMBJ40AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AHM3_B/H.pdf
- Description:
- 600W,40V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,372
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Product details
Overview
SMBJ40AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails 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 - deployed in automotive power supply inputs, industrial sensor interfaces, and telecom line protection.
For engineers reviewing the SMBJ40AHM3_B/H datasheet, SMBJ40AHM3_B/H pinout, SMBJ40AHM3_B/H application, or SMBJ40AHM3_B/H equivalent, this device delivers AEC-Q101 qualified surge immunity, halogen-free RoHS compliance, and low incremental surge resistance ideal for high-reliability 12 V/24 V system protection where fast response (<1 ns), stable clamping, and MSL Level 1 reflow compatibility are critical.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: under normal bias it presents <1.0 µA reverse leakage at 40 V; when transients exceed VBR, it avalanches into low-impedance conduction to clamp voltage at ≤64.5 V. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability across -55 °C to +150 °C operating range.
The device is optimized for 10/1000 µs surge waveforms per IEC 61000-4-5 and ANSI/IEEE C62.35, with thermal resistance RθJA = 100 °C/W (on 0.2" × 0.2" copper pads) and RθJL = 20 °C/W, enabling effective heat dissipation during repetitive surge events at 0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse working voltage before leakage exceeds 1.0 µA; defines safe operating margin for 36 V nominal DC systems. |
| VBR @ IT = 1 mA | 44.4–49.1 V - Breakdown voltage range ensuring reliable avalanche initiation without premature conduction in 40 V rail applications. |
| VC @ IPPM = 9.3 A | 64.5 V - Clamped voltage during 600 W 10/1000 µs surge; limits downstream IC stress to safe levels below typical 70 V absolute max ratings. |
| PPPM | 600 W - Peak pulse power handling capability; supports EN 61000-4-5 Level 4 (4 kV/2 Ω) surge testing on protected lines. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); enables survival of accidental polarity reversals or load dump events. |
| TJ max. | +150 °C - Maximum junction temperature; allows operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place and J-STD-020 reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry / Surge return path | Connected to system ground or low-side reference; completes clamping loop during transient events. |
| Cathode | Reverse-biased terminal / Protected line connection | Connected to the line being protected (e.g., 40 V rail input); avalanche conduction initiates here when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control units and ADAS power supplies. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IEC 61249-2-21 and JEDEC J-STD-20 MSL Level 1 requirements - eliminates toxic off-gassing during reflow and end-of-life disposal. |
| 600 W peak pulse power (10/1000 µs) | Handles repeated surges per IEC 61000-4-5 without parameter shift - enables single-device protection for CAN, LIN, and 24 V sensor bus interfaces. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes let-through energy during clamping - reduces stress on downstream MOSFETs, regulators, and microcontrollers in compact PCB layouts. |
| Fast response time (<1 ns) | Activates before most semiconductor damage thresholds are exceeded - protects against ESD (IEC 61000-4-2) and fast-rising inductive switching spikes. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs from load dump transients (ISO 16750-2) and jump-start voltage spikes. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND, clamping surges above 44.4 V while maintaining <1 µA leakage at 40 V. Use Value: Limits peak voltage to 64.5 V during 600 W surges, preventing damage to 75 V-rated DC-DC controllers and CAN transceivers. |
Use Scenario: Safeguarding analog outputs of pressure/temperature sensors in factory automation PLC modules exposed to relay coil kickback. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted directly at sensor connector, suppressing sub-microsecond inductive spikes before they reach ADC front-end. Use Value: Clamps 9.3 A transients within 1 ns while adding only 0.1 µA leakage at 40 V - preserves signal integrity and measurement accuracy. |
| Telecom DC Power Feeds | Consumer Device USB Power Rail |
|
Use Scenario: Securing -48 V telecom rectifier outputs against lightning-induced surges entering central office equipment. IC Role / Device Role / Timing Role: Unidirectional TVS installed upstream of hot-swap controllers and PMICs, rated for continuous -48 V operation with 40 V VWM. Use Value: Withstands 100 A non-repetitive forward surge (IFSM), surviving accidental reverse polarity connections during field maintenance. |
Use Scenario: Overvoltage suppression on 5 V USB-C PD power delivery paths in smart home hubs and docking stations. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary DC-DC converter, guarding USB port controller ICs from adapter fault conditions. Use Value: Halogen-free HM3 construction meets IEC 62368-1 flammability and environmental compliance for consumer product certifications. |
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_B/H | RoHS-compliant but not halogen-free; uses standard SnPb-free matte tin plating without halogen-free molding compound. | Approved for commercial/industrial use but not automotive AEC-Q101; lacks qualification for under-hood deployment. | Select when halogen-free requirement is waived and cost sensitivity outweighs automotive qualification needs. |
| SMBJ40A-M3/52 | Same electrical specs and SMB package; differs only in packaging format (750-piece 7" reel vs. B/H tape-and-reel variant). | No functional difference - identical surge performance, thermal behavior, and board-level reliability. | Choose based on procurement logistics: B/H denotes specific tape/reel configuration per Vishay's ordering matrix, not electrical distinction. |
Compared with SMBJ40AHM3_B/H, the HE3 variant trades halogen-free compliance for lower cost in non-automotive settings, while the M3/52 offers identical protection in a standard reel format - making SMBJ40AHM3_B/H the optimal choice when both AEC-Q101 validation and halogen-free manufacturing are mandatory.
Availability
SMBJ40AHM3_B/H is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor interface boards, and telecom power feed protection requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ40AHM3_B/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 high-reliability, high-efficiency, and automotive-qualified components.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure due to voltage surges must be eliminated through proven clamping performance and AEC-Q101 validation.
FAQ
What is the maximum clamping voltage of SMBJ40AHM3_B/H at its rated peak pulse current?
The SMBJ40AHM3_B/H has a maximum clamping voltage (VC) of 64.5 V at its specified peak pulse current (IPPM) of 9.3 A, measured using the standardized 10/1000 µs double-exponential waveform. This value ensures that downstream circuitry connected to the protected line remains within safe operating voltage limits during surge events, and is confirmed in Vishay's datasheet Document Number 88392, page 2.
Is SMBJ40AHM3_B/H qualified for automotive applications?
Yes, SMBJ40AHM3_B/H is AEC-Q101 qualified, as explicitly stated in the Vishay datasheet under "MECHANICAL DATA" and "ORDERING INFORMATION" sections. The "HM3" suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction - making SMBJ40AHM3_B/H suitable for engine control units, body electronics, and ADAS power domains where automotive-grade reliability is mandated.
What does the "B/H" suffix mean in SMBJ40AHM3_B/H?
The "B/H" suffix in SMBJ40AHM3_B/H refers to Vishay's internal tape-and-reel packaging designation: "B" indicates the revision code, and "H" specifies the preferred package code for a 750-piece 7-inch diameter plastic tape-and-reel delivery format. This is defined in the "ORDERING INFORMATION" table on page 3 of the SMBJ5.0A–SMBJ188A datasheet (Document Number 88392).
How does SMBJ40AHM3_B/H differ from bidirectional variants like SMBJ40CA?
SMBJ40AHM3_B/H is unidirectional, with polarity marked by a cathode band and intended for DC line protection where reverse conduction is blocked. In contrast, SMBJ40CA is bidirectional - symmetrical in both directions, no polarity marking, and used for AC signal lines or differential buses. Their VBR, VC, and PPPM values differ slightly due to structural asymmetry; SMBJ40AHM3_B/H cannot substitute for SMBJ40CA without circuit redesign.
What is the thermal resistance from junction to ambient for SMBJ40AHM3_B/H?
The typical thermal resistance from junction to ambient (RθJA) for SMBJ40AHM3_B/H is 100 °C/W, measured on a standard 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad layout per JEDEC standards. This value assumes no additional heatsinking and guides thermal design for sustained surge duty cycles - critical when evaluating derating above 25 °C ambient per Figure 2 in the Vishay datasheet.
SMBJ40AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- 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:
- 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_B/H FAQ
1.How can I place an order for SMBJ40AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AHM3_B/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_B/H reliable?
The price and inventory of SMBJ40AHM3_B/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_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ40AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AHM3_B/H?
SMBJ40AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AHM3_B/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_B/H?
For technical support, including SMBJ40AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ40AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ40AHM3_B/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_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ40AHM3_B/H?
All SMBJ40AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AHM3_B/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_B/H part is unused and in its original packaging.
Return procedure for SMBJ40AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AHM3_B/H Tags
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