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Vishay General Semiconductor - Diodes Division SMBJ43AHM3/I
- Part No.:
- SMBJ43AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43AHM3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,252
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Product details
Overview
SMBJ43AHM3/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 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 8.6 A peak pulse current, and 600 W peak pulse power rating with a 10/1000 µs waveform - deployed in industrial motor drives, automotive ECUs, and telecom power supplies.
For engineers reviewing the SMBJ43AHM3/I datasheet, SMBJ43AHM3/I pinout, SMBJ43AHM3/I application, or SMBJ43AHM3/I equivalent, key selection criteria include its halogen-free RoHS-compliant HM3 suffix, AEC-Q101 qualification status, unidirectional polarity with cathode band marking, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a clamping device that remains non-conductive below 43 V and rapidly transitions to low-impedance conduction above its breakdown threshold to shunt transient energy away from protected circuitry. Its glass-passivated junction ensures stable leakage performance (<1.0 µA at VWM) and fast response time (<1.0 ns), critical for suppressing ESD and inductive switching spikes.
The SMBJ43AHM3/I is rated for repetitive surge duty cycle of 0.01 %, supports 100 A peak forward surge current (IFSM, 8.3 ms half-sine), and maintains operation across -55 °C to +150 °C junction temperature range - enabling use in high-reliability automotive and industrial environments where thermal derating and long-term stability are essential.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before significant leakage; defines safe DC rail protection level. |
| VBR (min/max) | 47.8 V / 52.8 V at IT = 1 mA - Confirmed breakdown window ensuring reliable triggering without premature conduction. |
| VC @ IPPM | 69.4 V at 8.6 A - Clamped voltage during 10/1000 µs surge; determines maximum stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 4 surges. |
| IFSM | 100 A - Single half-sine surge rating (8.3 ms); supports protection of power MOSFETs and gate drivers. |
| TJ max | +150 °C - Maximum junction temperature; enables placement near heat sources in compact industrial modules. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal design. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads solderable per J-STD-002. Cathode indicated by molded band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 43 V supply rail); carries full surge current during clamping. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements - supports use in engine control units and ADAS power stages. |
| Halogen-free HM3 suffix | Meets IEC 61249-2-21 and JEDEC J-STD-203 standards for green manufacturing and end-of-life compliance. |
| 600 W peak pulse power | Withstands 10/1000 µs transients up to 8.6 A - sufficient for ISO 7637-2 Pulse 1/2b and IEC 61000-4-5 Combination Wave testing. |
| Low incremental surge resistance | Enables tight clamping (VC/IPPM ratio = 8.1 Ω) - minimizes voltage overshoot during fast-rising transients. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without preconditioning - simplifies SMT assembly planning. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 42 V battery-fed microcontroller power inputs in engine control modules against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between VCC and GND, triggered within <1 ns to limit voltage excursions to ≤69.4 V. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V LDOs and MCU cores during 12 V/24 V system transients. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector entry point to suppress ESD and cable-coupled surges before signal conditioning stage. Use Value: Maintains signal integrity with <1.0 µA leakage at 43 V, avoiding offset errors in precision current-loop receivers. |
| Telecom DC-DC Converter Input | Motor Drive Gate Driver Supply |
|
Use Scenario: Safeguarding primary-side input of isolated 48 V telecom DC-DC converters exposed to lightning-induced surges on PoE or base station backplanes. IC Role / Device Role / Timing Role: First-line transient suppressor upstream of input filter and active rectification stage. Use Value: Absorbs 600 W pulses without degradation, preserving converter reliability under repeated IEC 61000-4-5 Level 4 stress. |
Use Scenario: Protecting isolated 15 V gate driver supply rails in three-phase inverter modules used in HVAC compressors and EV traction inverters. IC Role / Device Role / Timing Role: Clamp diode placed across gate driver VDD-GND to suppress Miller-induced spikes and shoot-through risks. Use Value: Withstands 100 A surge (8.3 ms) and operates up to +150 °C - matches thermal profile of adjacent power semiconductors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43AHE3/I | RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial-grade industrial equipment where automotive qualification is unnecessary. | Select when cost sensitivity outweighs halogen-free or automotive compliance requirements. |
| SMBJ43CAHM3/I | Bidirectional variant with same VWM (43 V) and VC (69.4 V), but symmetrical clamping in both polarities. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where polarity reversal may occur. | Choose only if bidirectional protection is mandated by interface standard or signal swing range. |
Compared with SMBJ43AHM3/I, the HE3/I alternative trades halogen-free construction and AEC-Q101 validation for lower unit cost, while the SMBJ43CAHM3/I provides polarity-agnostic clamping at identical power ratings - making SMBJ43AHM3/I optimal for cost-sensitive, high-reliability unidirectional DC rail protection.
Availability
SMBJ43AHM3/I is available at Aetrix Electronics and suitable for automotive ECU designs, industrial sensor nodes, telecom power systems, and motor drive gate driver circuits requiring stable component supply with guaranteed long-term manufacturability.
Supply support for SMBJ43AHM3/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 was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where failure modes must be mitigated without compromising signal fidelity or thermal margin.
FAQ
What is the clamping voltage of SMBJ43AHM3/I at its rated peak pulse current?
The SMBJ43AHM3/I has a maximum clamping voltage (VC) of 69.4 V at 8.6 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ43AHM3/I maintains this clamping performance across its specified operating temperature range and is validated per IEC 61000-4-5 test methodology.
Is SMBJ43AHM3/I qualified for automotive applications?
Yes, SMBJ43AHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88392 (Revision 09-Jan-2024). This qualification covers stress tests including high-temperature operating life, temperature cycling, and ESD robustness - making SMBJ43AHM3/I suitable for under-hood and chassis-mounted automotive electronics such as body control modules and ADAS power supplies.
How does the HM3 suffix differ from the E3 or HE3 suffix in SMBJ43A variants?
The HM3 suffix on SMBJ43AHM3/I indicates halogen-free, RoHS-compliant construction with AEC-Q101 qualification. In contrast, E3 denotes RoHS-compliant but non-halogen-free commercial grade, and HE3 adds AEC-Q101 qualification without halogen-free compliance. The SMBJ43AHM3/I therefore meets stricter environmental and reliability requirements than E3 or HE3 versions, particularly for automotive and green industrial programs.
What is the thermal resistance of SMBJ43AHM3/I, and how does it affect PCB layout?
SMBJ43AHM3/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. This value assumes standard FR-4 board material and no internal plane layers. To maintain safe junction temperatures under sustained power dissipation, designers must allocate adequate copper area and avoid routing high-current traces directly beneath the SMBJ43AHM3/I body.
Can SMBJ43AHM3/I be used in bidirectional signal protection applications?
No - SMBJ43AHM3/I is a unidirectional TVS diode, with polarity marked by a cathode band and intended for DC rail protection where reverse voltage is blocked. For bidirectional signal lines (e.g., USB, RS-485, CAN), the bidirectional variant SMBJ43CAHM3/I must be used instead. Using SMBJ43AHM3/I on AC-coupled or floating signals risks reverse breakdown and permanent damage due to lack of symmetrical clamping capability.
SMBJ43AHM3/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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- 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)
SMBJ43AHM3/I FAQ
1.How can I place an order for SMBJ43AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43AHM3/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 SMBJ43AHM3/I reliable?
The price and inventory of SMBJ43AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43AHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ43AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43AHM3/I?
SMBJ43AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43AHM3/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 SMBJ43AHM3/I?
For technical support, including SMBJ43AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43AHM3/I requirements.
6.How does Aetrix verify that SMBJ43AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ43AHM3/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 SMBJ43AHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ43AHM3/I?
All SMBJ43AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43AHM3/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 SMBJ43AHM3/I part is unused and in its original packaging.
Return procedure for SMBJ43AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43AHM3/I Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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