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Vishay General Semiconductor - Diodes Division SMBJ43A-M3/5B
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- Part No.:
- SMBJ43A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43A-M3/5B.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,125
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Product details
Overview
SMBJ43A-M3/5B 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 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 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ43A-M3/5B datasheet, SMBJ43A-M3/5B pinout, SMBJ43A-M3/5B application, or SMBJ43A-M3/5B equivalent, key selection criteria include unidirectional polarity, halogen-free RoHS-compliant construction (M3 suffix), 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This TVS diode operates as a voltage-clamping protection device, conducting only when reverse voltage exceeds its breakdown threshold to shunt transient energy to ground. Its glass-passivated junction ensures stable VBR tolerance (±5%) and fast response time (<1 ns), while the SMB package provides mechanical robustness and thermal performance with RθJA = 100 °C/W.
The SMBJ43A-M3/5B is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports 0.01% duty cycle repetitive operation, and meets J-STD-020 MSL Level 1 with 260 °C reflow peak - confirming suitability for high-reliability commercial PCB assembly without moisture sensitivity concerns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR min/max | 47.8 V / 52.8 V at IT = 1 mA - Confirmed breakdown range ensuring predictable turn-on under ESD or surge events. |
| VC @ IPPM | 69.4 V at 8.6 A - Clamped voltage during 600 W transient; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates immunity to IEC 61000-4-5 Level 4 surges. |
| IPPM | 8.6 A - Peak pulse current capability; sets minimum trace width and grounding path design requirements. |
| TJ max | +150 °C - Maximum junction temperature; enables use in enclosed industrial enclosures without active cooling. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with cathode band marking; compatible with JEDEC MS-012AC. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, and polarity indicated by cathode band on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to protected line (e.g., +12 V rail); must be routed with low-inductance path to ground reference. |
| Cathode | Current exit terminal during reverse clamping | Connected to system ground; requires low-impedance return path to handle 8.6 A transient current without voltage overshoot. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Validates compliance with IEC 61000-4-5 surge immunity up to 4 kV (line-to-ground) in industrial environments. |
| Low clamping voltage (69.4 V) | Ensures protected downstream ICs (e.g., microcontrollers, gate drivers) remain within absolute maximum ratings during transients. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance for global OEM shipments and eliminates corrosive halogen emissions during board rework or failure. |
| MSL Level 1 moisture sensitivity | Enables direct placement from reel without baking; reduces manufacturing overhead and avoids delamination risk. |
| 100 A IFSM surge rating | Supports robustness against accidental DC overvoltage or inrush events in power supply input stages. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver ICs and MOSFETs against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Unidirectional clamping device placed across DC bus or gate-source terminals to limit voltage spikes to ≤69.4 V. Use Value: Prevents destructive avalanche failure in 40 V-rated logic-level MOSFETs during 100 µs–1 ms switching transients. |
Use Scenario: Input line protection for LIN bus transceivers and microcontroller I/O pins exposed to battery dump energy. IC Role / Device Role / Timing Role: Standoff clamp on 12 V supply rail upstream of LDO regulators, activated only during >43 V overvoltage events. Use Value: Maintains functional safety integrity by limiting rail voltage to 69.4 V during ISO 7637-2 Pulse 5a (load dump) tests. |
| Telecom Power Rectifiers | Consumer Appliance Sensor Interfaces |
|
Use Scenario: Secondary-side surge suppression on 48 V telecom power supplies feeding PoE injectors and baseband processors. IC Role / Device Role / Timing Role: Parallel-connected TVS across output capacitor bank to absorb coupled lightning-induced surges. Use Value: Enables sustained operation after 600 W transient without derating output capacitance or adding series impedance. |
Use Scenario: ESD protection for analog sensor outputs (e.g., temperature, humidity) connected to MCU ADC inputs via long flex cables. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) unidirectional clamp on signal line referenced to local ground plane. Use Value: Passes IEC 61000-4-2 ±8 kV contact discharge without signal distortion or ADC offset shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43A-E3/5B | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive commercial equipment). | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and thermal behavior. |
| SMBJ43CA-M3/5B | Bidirectional variant with symmetric VBR (47.8–52.8 V) and same VC; no polarity marking. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN bus) where reverse polarity transients occur. | Choose only if bidirectional clamping is needed; not a drop-in replacement due to polarity independence. |
Compared with SMBJ43A-E3/5B, the SMBJ43A-M3/5B adds halogen-free compliance without sacrificing surge rating or thermal performance; compared with SMBJ43CA-M3/5B, it offers lower leakage and tighter VBR tolerance for DC-biased rails but requires correct cathode orientation during placement.
Availability
SMBJ43A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power rectifiers, and consumer appliance sensor interfaces requiring stable component supply and full halogen-free compliance.
Supply support for SMBJ43A-M3/5B 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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in space-constrained SMT designs, targeting industrial, automotive, and telecom systems where consistent clamping performance and long-term stability are critical.
FAQ
What is the maximum clamping voltage of SMBJ43A-M3/5B at its rated peak pulse current?
The SMBJ43A-M3/5B has a maximum clamping voltage (VC) of 69.4 V at its specified peak pulse current (IPPM) of 8.6 A, measured using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during transient events and is confirmed per Vishay document 88392, page 2. Designers must ensure downstream components tolerate this clamped level under worst-case surge conditions. The SMBJ43A-M3/5B maintains this performance across its full operating temperature range.
Does SMBJ43A-M3/5B meet automotive qualification standards?
No, SMBJ43A-M3/5B is a commercial-grade part with halogen-free RoHS compliance (M3 suffix) but is not AEC-Q101 qualified. For automotive applications, Vishay offers the HM3 variant (e.g., SMBJ43A-HM3/5B), which includes additional stress testing and traceability. The SMBJ43A-M3/5B remains suitable for industrial and telecom uses where AEC-Q101 is not required. Always verify qualification status using the full ordering code - SMBJ43A-M3/5B does not carry HE3 or HM3 automotive suffixes.
How does the M3 suffix affect the material composition of SMBJ43A-M3/5B?
The M3 suffix indicates that SMBJ43A-M3/5B uses halogen-free molding compound and lead finish, meeting IEC 61249-2-21 requirements for bromine and chlorine content (<900 ppm each). This eliminates corrosive halogen gas emission during soldering or field failure, supporting safer recycling and higher reliability in humid environments. Unlike E3 variants, SMBJ43A-M3/5B avoids brominated flame retardants while retaining UL 94 V-0 flammability rating and identical electrical performance.
Can SMBJ43A-M3/5B be used in bidirectional signal protection applications?
No, SMBJ43A-M3/5B is strictly unidirectional and must be oriented with its cathode band toward the positive rail to function correctly. For bidirectional protection (e.g., AC lines, differential buses), the SMBJ43CA-M3/5B variant is required - it features symmetrical breakdown in both directions and no polarity marking. Using SMBJ43A-M3/5B on bidirectional signals risks open-circuit failure during negative transients, as it blocks conduction below −0.7 V forward drop and does not clamp in reverse polarity.
What is the thermal resistance from junction to ambient for SMBJ43A-M3/5B?
The SMBJ43A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pad per terminal, per Vishay document 88392, page 3. This value assumes standard FR-4 PCB with no internal copper planes. Actual RθJA improves with larger copper areas or thermal vias. The SMBJ43A-M3/5B can safely dissipate 5.0 W continuously at 50 °C ambient when properly heatsinked, supporting reliable operation in sealed enclosures.
SMBJ43A-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ43A-M3/5B FAQ
1.How can I place an order for SMBJ43A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43A-M3/5B 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 SMBJ43A-M3/5B reliable?
The price and inventory of SMBJ43A-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ43A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43A-M3/5B?
SMBJ43A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43A-M3/5B 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 SMBJ43A-M3/5B?
For technical support, including SMBJ43A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43A-M3/5B requirements.
6.How does Aetrix verify that SMBJ43A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ43A-M3/5B 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 SMBJ43A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ43A-M3/5B?
All SMBJ43A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43A-M3/5B, 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 SMBJ43A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ43A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43A-M3/5B Tags
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