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Vishay General Semiconductor - Diodes Division SMBJ40AHM3_A/I
- Part No.:
- SMBJ40AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AHM3_A/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,359
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Product details
Overview
SMBJ40AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the 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 industrial motor drives, automotive ECUs, and sensor interface circuits.
For engineers reviewing the SMBJ40AHM3_A/I datasheet, SMBJ40AHM3_A/I pinout, SMBJ40AHM3_A/I application, or SMBJ40AHM3_A/I equivalent, key selection criteria include clamping performance under 8.3 ms surge, thermal resistance (RθJA = 100 °C/W), halogen-free RoHS compliance (HM3 suffix), AEC-Q101 qualification readiness, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its cathode-band polarity marking enables unambiguous orientation during PCB assembly, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak temperature tolerance.
The device is rated for continuous operation from –55 °C to +150 °C junction temperature, dissipates 5.0 W at TA = 50 °C on infinite heatsink, and supports 100 A non-repetitive forward surge current (IFSM) - making it suitable for protecting MOSFET gates, microcontroller I/O, and 40 V nominal supply rails against inductive switching transients and ESD events.
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) | 44.4 V / 49.1 V at IT = 1 mA - Ensures reliable avalanche conduction onset within tight tolerance for predictable clamping behavior. |
| VC @ IPPM | 64.5 V at 9.3 A - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe levels in 40 V systems. |
| PPPM | 600 W - Peak pulse power handling capacity; sustains transient energy without failure under standardized lightning/surge test conditions. |
| IFSM | 100 A - Single half-sine surge current rating (8.3 ms); protects against high-energy inductive kickback in relay or solenoid drivers. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs thermal derating above 25 °C ambient. |
| Package | SMB (DO-214AA) - Low-profile surface-mount outline with 5.59 mm max length, 4.06 mm max width, and 2.20 mm max height for space-constrained layouts. |
Pinout & Package
Package: SMB (DO-214AA), unidirectional configuration with cathode band marking on one end. Matte tin-plated leads meet J-STD-002 solderability and JESD22-B102 whisker resistance Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; forms clamping path when cathode is biased above VWM. |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 40 V rail or signal trace); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 40 V DC bus without degradation. |
| Halogen-free, RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for automotive and industrial OEM programs without compromising surge robustness. |
| AEC-Q101 qualification ready | Base P/NHM3_X variant supports automotive-grade reliability validation; qualified versions available with HE3/HM3 suffixes. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for sensitive 3.3 V or 5 V logic interfaces. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture-induced damage or parametric shift. |
Applications
| Industrial Motor Drive Protection | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Suppressing inductive kickback from 40 V BLDC motor gate drivers and H-bridge freewheeling paths. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed across MOSFET drain-source or supply rail to limit voltage spikes during PWM switching. Use Value: Prevents MOSFET avalanche failure and gate oxide damage by clamping transients to ≤64.5 V, maintaining system uptime in harsh EMI environments. |
Use Scenario: Protecting LIN bus transceivers and microcontroller I/O pins in BCM modules exposed to load dump and jump-start events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V/40 V auxiliary rails and signal lines to absorb ISO 7637-2 Pulse 1/2/5a energy. Use Value: Maintains functional safety integrity by limiting transient voltage to <65 V during 100 V/50 ms load dump, avoiding brownout or latch-up in 32-bit MCUs. |
| Telecom Power Supply Input | Industrial Sensor Interface Protection |
|
Use Scenario: Safeguarding 48 V telecom rectifier outputs and PoE+ midspan injectors against lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-stage TVS on DC input rail upstream of DC-DC converters to shunt surge current before regulation stage. Use Value: Absorbs up to 600 W of transient energy without thermal runaway, preserving converter efficiency and enabling compact heatsinkless design. |
Use Scenario: Shielding analog front-end inputs of 4–20 mA current loop sensors and RTD interfaces in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS on signal lines to suppress ESD (IEC 61000-4-2 ±8 kV contact) while minimizing signal distortion. Use Value: Limits clamping voltage to 64.5 V with <1 nA leakage at 40 V, ensuring measurement accuracy remains unaffected during normal operation. |
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_A/I | RoHS-compliant (E3), non-halogen-free; same electrical specs and AEC-Q101 qualification path but lacks halogen-free certification. | Preferred for commercial/industrial use where halogen-free mandate is not enforced; identical thermal and surge performance. | Select when cost sensitivity outweighs halogen-free requirement and automotive qualification is not mandatory. |
| SMBJ40CAHM3_A/I | Bidirectional variant with symmetric VBR (44.4–49.1 V) and same VC; no polarity marking; ID doubled for VWM ≤10 V (not applicable here). | Required only for AC-coupled or bidirectional signal lines (e.g., RS-485, CAN FD); unsuitable for DC rail protection due to reverse conduction. | Choose only if protecting balanced differential signals; otherwise, unidirectional SMBJ40AHM3_A/I provides superior DC blocking and lower leakage. |
Compared with SMBJ40AHE3_A/I, the HM3 version adds halogen-free compliance without sacrificing surge capability or thermal performance; versus SMBJ40CAHM3_A/I, the unidirectional configuration ensures zero reverse leakage at 40 V and avoids unintended conduction in DC-biased circuits.
Availability
SMBJ40AHM3_A/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supply designs requiring stable component supply, halogen-free compliance, and AEC-Q101 qualification readiness.
Supply support for SMBJ40AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series is engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping, low leakage, and robust SMT manufacturability across wide temperature ranges.
FAQ
What is the maximum clamping voltage of SMBJ40AHM3_A/I at its rated peak pulse current?
The SMBJ40AHM3_A/I has a maximum clamping voltage (VC) of 64.5 V at its rated peak pulse current (IPPM) of 9.3 A under the 10/1000 µs waveform condition. This value is measured per ANSI/IEEE C62.35 standards and ensures predictable overvoltage limiting for 40 V nominal systems. The SMBJ40AHM3_A/I maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBJ40AHM3_A/I suitable for automotive applications requiring AEC-Q101 qualification?
Yes - the HM3 suffix indicates halogen-free, RoHS-compliant construction, and the base part number SMBJ40AHM3_A/I is designated for AEC-Q101 qualification (with "_X" revision code, e.g., A or B). While the base part itself is qualified-ready, final AEC-Q101 certification applies to variants marked HM3_A or HM3_B. The SMBJ40AHM3_A/I shares identical electrical, thermal, and mechanical specifications with qualified versions and is widely used in automotive BCM and ADAS subsystems.
How does the SMBJ40AHM3_A/I differ from the bidirectional SMBJ40CAHM3_A/I variant?
The SMBJ40AHM3_A/I is unidirectional with cathode-band polarity marking and blocks reverse current up to 40 V, whereas SMBJ40CAHM3_A/I is bidirectional with symmetrical breakdown in both directions and no polarity marking. The SMBJ40AHM3_A/I exhibits <1.0 µA reverse leakage at 40 V, while the CA variant doubles leakage spec for VWM ≤10 V (not relevant here). For DC rail protection, SMBJ40AHM3_A/I is preferred; SMBJ40CAHM3_A/I is reserved for AC or differential signal lines like CAN or RS-485.
What is the thermal resistance and power derating behavior of SMBJ40AHM3_A/I?
The SMBJ40AHM3_A/I 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. Its steady-state power dissipation (PD) is rated at 5.0 W at TA = 50 °C, and derating follows the curve in Figure 2 of Vishay document 88392 - linear reduction to zero at 150 °C junction temperature. The SMBJ40AHM3_A/I does not require external heatsinking for typical surge duty cycles (<0.01% duty).
Can SMBJ40AHM3_A/I be used in place of SMAJ40A in existing designs?
No - SMBJ40AHM3_A/I uses the larger SMB (DO-214AA) package (5.59 mm × 4.06 mm), while SMAJ40A uses the smaller SMA (DO-214AC) package (4.57 mm × 2.69 mm). Though both share 40 V VWM and 600 W PPPM, the SMBJ40AHM3_A/I offers higher IPPM (9.3 A vs. 6.4 A for SMAJ40A) and lower RθJA (100 °C/W vs. 130 °C/W), but requires PCB pad redesign. Direct replacement is not possible without layout modification; the SMBJ40AHM3_A/I is selected for higher surge robustness where board space permits.
SMBJ40AHM3_A/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:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SMBJ40AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AHM3_A/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 SMBJ40AHM3_A/I reliable?
The price and inventory of SMBJ40AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ40AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AHM3_A/I?
SMBJ40AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AHM3_A/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 SMBJ40AHM3_A/I?
For technical support, including SMBJ40AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ40AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40AHM3_A/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 SMBJ40AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ40AHM3_A/I?
All SMBJ40AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AHM3_A/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 SMBJ40AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ40AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AHM3_A/I Tags
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Diodes Incorporated
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