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Vishay General Semiconductor - Diodes Division SMBJ40AHM3/I
- Part No.:
- SMBJ40AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40AHM3/I.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,847
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Product details
Overview
SMBJ40AHM3/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features 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.
For engineers reviewing the SMBJ40AHM3/I datasheet, SMBJ40AHM3/I pinout, SMBJ40AHM3/I application, or SMBJ40AHM3/I equivalent, this device is selected for robust overvoltage protection in DC power rails, I/O interfaces, and automotive-grade sensor signal lines where low leakage (<1.0 µA at VWM), fast response time, and AEC-Q101 qualification are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for stable avalanche behavior under surge conditions. Its thermal resistance (RθJA = 100 °C/W) and junction temperature range (–55 °C to +150 °C) support reliable operation in industrial and automotive ambient environments.
The SMBJ40AHM3/I delivers precise clamping performance: at 9.3 A IPPM (10/1000 µs), it limits voltage to ≤64.5 V while maintaining <1.0 µA reverse leakage at 40 V stand-off. Its MSL Level 1 rating (260 °C peak reflow) and halogen-free, RoHS-compliant construction meet stringent manufacturing and environmental requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 44.4 V / 49.1 V at 1 mA - Ensures predictable avalanche onset across production lot |
| VC @ IPPM | 64.5 V at 9.3 A - Limits transient voltage to safe levels for downstream 3.3 V/5 V ICs |
| PPPM | 600 W - Withstands high-energy transients per 10/1000 µs waveform (0.01% duty cycle) |
| ID @ VWM | <1.0 µA - Minimizes standby power loss in battery-powered systems |
| TJ max | +150 °C - Supports operation in under-hood automotive and industrial control enclosures |
| Package | SMB (DO-214AA) - Compatible with standard SMT pick-and-place and reflow profiles |
Pinout & Package
SMBJ40AHM3/I uses the SMB (DO-214AA) surface-mount package: 4.57 mm × 3.94 mm body, 2.20 mm height, matte tin-plated leads, MSL Level 1, 260 °C peak reflow. Polarity is marked by a cathode band on the case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection in unidirectional configuration | Connected to ground or low-voltage reference; completes clamping path during positive transients |
| Cathode | High-side connection with band marking | Connected to protected line (e.g., 40 V rail); conducts avalanche current when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and ADAS sensor interfaces |
| Halogen-free & RoHS-compliant | Meets global environmental compliance mandates without compromising surge robustness |
| 600 W peak pulse power | Clamps high-energy transients (e.g., ISO 7637-2 Pulse 1/2a/5a) without degradation |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response time) |
| MSL Level 1 | Enables single-pass reflow assembly without moisture sensitivity concerns |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V supply lines in vehicle body control modules from load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between power input and DC-DC converter input stage. Use Value: Clamps transients up to 64.5 V to prevent damage to downstream regulators and microcontrollers rated for ≤40 V absolute maximum. | Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Line-side transient suppressor on 4–20 mA or 0–10 V signal paths exposed to EMI and relay switching noise. Use Value: Maintains signal integrity by limiting induced surges to <65 V while contributing <1 µA leakage-no impact on loop accuracy. |
| Telecom DC Power Input Protection | Consumer Device USB/DC Jack Protection |
Use Scenario: Safeguarding primary DC input (e.g., 48 V PoE-derived supply) in network switches and base station radios. IC Role / Device Role / Timing Role: First-line overvoltage clamp upstream of hot-swap controllers and PMICs. Use Value: Absorbs 600 W surge energy per IEC 61000-4-5 Combination Wave test without failure or parameter shift. | Use Scenario: Hardening external DC jack inputs (e.g., 5 V/12 V adapters) in smart home hubs and portable displays. IC Role / Device Role / Timing Role: Standoff-rated TVS placed directly at connector entry point to shunt ESD and plug-in surges. Use Value: Provides 30 kV contact ESD immunity (per IEC 61000-4-2) and clamps 10/1000 µs surges to ≤64.5 V with no system reset or latch-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40AHE3/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Preferred for commercial-grade designs where halogen content is unrestricted | Select when cost optimization is prioritized and halogen-free requirement is absent |
| SMAJ40A-M3/5B | Lower 400 W PPPM, SMA package (smaller footprint, higher RθJA = 140 °C/W) | Suitable for space-constrained consumer PCBs with lower surge threat level | Choose only if board area is critical and peak surge energy remains ≤400 W |
Compared with SMBJ40AHM3/I, SMBJ40AHE3/I offers identical protection performance without halogen-free assurance, while SMAJ40A-M3/5B trades 33% lower surge capacity and reduced thermal margin for smaller size-neither is pin-compatible due to differing package outlines (SMB vs. SMA).
Availability
SMBJ40AHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power supplies, and consumer DC-input protection requiring stable component supply and long-term lifecycle continuity.
Supply support for SMBJ40AHM3/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-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ40AHM3/I at its rated peak pulse current?
The SMBJ40AHM3/I has a maximum clamping voltage (VC) of 64.5 V at 9.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value ensures protected circuits-such as 48 V-tolerant interface ICs or 3.3 V logic with external LDOs-remain within safe operating limits during surge events. The SMBJ40AHM3/I achieves this with low incremental resistance and stable avalanche characteristics across temperature.
Is SMBJ40AHM3/I qualified for automotive use?
Yes, SMBJ40AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" (halogen-free, RoHS-compliant, and AEC-Q101 qualified). It is rated for operation from –55 °C to +150 °C and validated for mechanical shock, temperature cycling, and humidity exposure per automotive stress test standards. The SMBJ40AHM3/I is suitable for under-hood and cabin applications including body control modules and ADAS sensor power conditioning.
What does the "HM3" suffix mean in SMBJ40AHM3/I?
The "HM3" suffix in SMBJ40AHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering nomenclature, "H" denotes halogen-free material, "M3" confirms RoHS compliance and JESD201 Class 2 whisker resistance, and the "/I" denotes 13-inch tape-and-reel packaging (3200 units per reel). This distinguishes it from "HE3" (RoHS only, not halogen-free) and "E3" (commercial-grade, non-automotive).
How does SMBJ40AHM3/I compare to bidirectional TVS diodes like SMBJ40CA?
SMBJ40AHM3/I is unidirectional and intended for DC line protection where polarity is fixed (e.g., +40 V rail to ground), offering lower leakage (<1.0 µA) and forward voltage drop (VF ≤ 3.5 V at 50 A). In contrast, SMBJ40CA is bidirectional, suited for AC or floating signal lines, but exhibits higher leakage and lacks forward conduction capability. The SMBJ40AHM3/I cannot replace SMBJ40CA in AC-coupled applications without circuit redesign.
What is the thermal resistance of SMBJ40AHM3/I, and how does it affect layout?
The SMBJ40AHM3/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. To maintain TJ ≤ 150 °C during repetitive surges, PCB layout must provide adequate copper area and avoid thermal bottlenecks. Reducing pad size or omitting thermal vias increases RθJA, risking premature thermal runaway-designers should follow Vishay's recommended mounting pad layout for SMB (DO-214AA).
SMBJ40AHM3/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:
- 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/I FAQ
1.How can I place an order for SMBJ40AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40AHM3/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/I reliable?
The price and inventory of SMBJ40AHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMBJ40AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40AHM3/I?
SMBJ40AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40AHM3/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/I?
For technical support, including SMBJ40AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40AHM3/I requirements.
6.How does Aetrix verify that SMBJ40AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ40AHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMBJ40AHM3/I?
All SMBJ40AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40AHM3/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/I part is unused and in its original packaging.
Return procedure for SMBJ40AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ40AHM3/I Tags
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DESD3V3E1BL-7B
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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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