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Vishay General Semiconductor - Diodes Division SMBJ43AHM3_A/I
- Part No.:
- SMBJ43AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43AHM3_A/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,566
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Product details
Overview
SMBJ43AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the 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 and automotive control modules.
For engineers reviewing the SMBJ43AHM3_A/I datasheet, SMBJ43AHM3_A/I pinout, SMBJ43AHM3_A/I application, or SMBJ43AHM3_A/I equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification status, halogen-free RoHS compliance (HM3 suffix), thermal resistance (RθJA = 100 °C/W), and junction temperature range (–55 °C to +150 °C).
Technical Context
This TVS diode operates as a fast-acting shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 43 V), but switches to low-impedance conduction within <1 ns when transient voltage exceeds VBR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
The SMBJ43AHM3_A/I is rated for 600 W peak pulse power (10/1000 µs), supports 100 A non-repetitive forward surge current (8.3 ms half-sine), and maintains clamping performance across –55 °C to +150 °C operating junction temperature - validated per JESD22-B102 solderability and J-STD-020 MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC or AC RMS working limit. |
| VBR (min/max) | 47.8 V / 52.8 V at IT = 1 mA - guaranteed breakdown onset window; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 69.4 V at 8.6 A - maximum clamped voltage during 600 W transient; determines worst-case overvoltage seen by protected IC. |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform; defines surge energy absorption capability per event. |
| IFSM | 100 A - peak forward surge current (8.3 ms half-sine); supports robust protection against inductive switch-off spikes. |
| TJ Range | –55 °C to +150 °C - full operational junction temperature range; enables use in under-hood automotive and industrial environments. |
| 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. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band at one end; terminals are anode and cathode - no internal circuitry or active control logic.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to lower-potential side of protected line; enables unidirectional clamping from cathode to anode. |
| Cathode | Current exit terminal during forward conduction; marked with band | Connected to higher-potential side (e.g., VCC rail or signal line); conducts surge current to ground or return path when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables protection against high-energy transients such as ISO 7637-2 Pulse 1/2a/5a in automotive electronics without derating. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for engine control units and ADAS sensors. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for industrial and consumer products targeting EU, China, and Japan markets. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for 3.3 V/5 V logic interfaces. |
| MSL Level 1 (260 °C peak) | Allows single-reflow assembly without moisture sensitivity concerns - eliminates baking requirement and reduces manufacturing cost. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Suppresses load-dump and jump-start transients on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VBAT and GND, clamping surges exceeding 43 V. Use Value: Limits peak voltage to ≤69.4 V during 600 W pulses, preventing damage to 75 V-rated power management ICs and microcontrollers. |
Use Scenario: Shields analog front-end inputs of pressure/temperature sensors connected to noisy factory floor wiring. IC Role / Device Role / Timing Role: TVS mounted at connector entry point, referenced to local ground, guarding against ESD and inductive coupling. Use Value: Sub-1 ns response and 1 µA max leakage at 43 V preserve signal integrity while enabling ±8 kV contact ESD immunity per IEC 61000-4-2. |
| DC-DC Converter Input Protection | Telecom Line Card Surge Protection |
|
Use Scenario: Protects input stage of isolated 48 V-to-12 V buck converters in telecom power systems from lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed upstream of input filter capacitor, referenced to system ground. Use Value: Withstands 100 A surge (8.3 ms) and maintains clamping below 70 V, ensuring converter controller ICs remain within absolute maximum ratings. |
Use Scenario: Guards RS-485/RS-232 data lines on base station line cards exposed to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: TVS configured in series-shunt topology with current-limiting resistor, clamping differential-mode transients. Use Value: 69.4 V clamping voltage prevents latch-up in transceivers rated for 70 V abs max, while low capacitance (<100 pF) avoids signal distortion at 10 Mbps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43AHE3_A/I | Same electrical specs, but RoHS-compliant commercial grade (E3) - not AEC-Q101 qualified; lead finish identical, MSL Level 1 retained. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMBJ43AHE3_A/I for cost-sensitive non-automotive applications requiring same clamping performance and footprint. |
| SMAJ43A-M3/A | Lower 400 W PPPM, SMA (DO-214AC) package (smaller footprint: 4.57 mm × 2.69 mm), same VWM/VBR/VC specs, halogen-free. | Reduced surge handling; preferred where board space is constrained and 400 W suffices (e.g., low-power IoT nodes). | Choose SMAJ43A-M3/A only if layout area is critical and transient threat level is lower than automotive/industrial standards require. |
Compared with SMBJ43AHM3_A/I, SMBJ43AHE3_A/I offers identical protection performance without automotive qualification, while SMAJ43A-M3/A trades 33 % lower surge power for 30 % smaller PCB area - both require validation of mechanical fit and thermal dissipation in target layout.
Availability
SMBJ43AHM3_A/I is available at Aetrix Electronics and suitable for automotive control units, industrial sensor interfaces, and telecom power supply designs requiring stable component supply with AEC-Q101 assurance and halogen-free compliance.
Supply support for SMBJ43AHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness, AEC-Q101 compliance, and consistent clamping performance are mandatory.
FAQ
What is the clamping voltage of SMBJ43AHM3_A/I at its rated peak pulse current?
The SMBJ43AHM3_A/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 represents the worst-case voltage imposed on protected circuitry during a full 600 W transient event. The SMBJ43AHM3_A/I achieves this clamping performance while maintaining low incremental surge resistance, making it suitable for safeguarding 70 V-tolerant ICs in automotive and industrial applications.
Is SMBJ43AHM3_A/I qualified for automotive applications?
Yes, SMBJ43AHM3_A/I is AEC-Q101 qualified, as confirmed by the HM3 suffix in its ordering code - indicating halogen-free, RoHS-compliant construction with full automotive reliability testing (including temperature cycling, HTRB, and ESD). This qualification validates SMBJ43AHM3_A/I for use in engine control units, body electronics, and ADAS modules where sustained operation from –40 °C to +125 °C ambient and resistance to mechanical stress are required.
What does the "HM3" suffix mean in SMBJ43AHM3_A/I?
The "HM3" suffix in SMBJ43AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification - distinguishing it from commercial-grade variants like E3. It also specifies tape-and-reel packaging (I = 13-inch reel, 3200 units), matte tin-plated leads compliant with J-STD-002 and JESD22-B102, and MSL Level 1 rating for lead-free reflow up to 260 °C. This makes SMBJ43AHM3_A/I suitable for high-reliability automotive and industrial production.
How does SMBJ43AHM3_A/I compare to bidirectional TVS diodes like SMBJ43CA?
SMBJ43AHM3_A/I is unidirectional and intended for DC line protection where polarity is fixed (e.g., VCC-to-GND), offering lower leakage and sharper knee characteristics. In contrast, SMBJ43CA is bidirectional and suited for AC or floating signal lines (e.g., RS-485), with symmetrical clamping in both directions. The SMBJ43AHM3_A/I cannot replace SMBJ43CA in AC-coupled applications without circuit redesign, as its cathode band enforces polarity-dependent conduction.
What is the thermal resistance of SMBJ43AHM3_A/I, and how does it affect layout design?
The SMBJ43AHM3_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. This value assumes standard PCB layout - designers must provide adequate copper area and avoid excessive trace length to maintain safe junction temperatures under repetitive surge conditions. For high-duty-cycle applications, adding thermal vias or larger copper pours reduces effective RθJA and extends SMBJ43AHM3_A/I service life.
SMBJ43AHM3_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):
- 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_A/I FAQ
1.How can I place an order for SMBJ43AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43AHM3_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 SMBJ43AHM3_A/I reliable?
The price and inventory of SMBJ43AHM3_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 SMBJ43AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ43AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43AHM3_A/I?
SMBJ43AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43AHM3_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 SMBJ43AHM3_A/I?
For technical support, including SMBJ43AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43AHM3_A/I requirements.
6.How does Aetrix verify that SMBJ43AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ43AHM3_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 SMBJ43AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ43AHM3_A/I?
All SMBJ43AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43AHM3_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 SMBJ43AHM3_A/I part is unused and in its original packaging.
Return procedure for SMBJ43AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43AHM3_A/I Tags
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