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Vishay General Semiconductor - Diodes Division SMBJ43AHM3_B/I
- Part No.:
- SMBJ43AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43AHM3_B/I.pdf
- Description:
- 600W,43V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,048
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Product details
Overview
SMBJ43AHM3_B/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 ESD, lightning-induced surges, and inductive switching transients. 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.
For engineers reviewing the SMBJ43AHM3_B/I datasheet, SMBJ43AHM3_B/I pinout, SMBJ43AHM3_B/I application, or SMBJ43AHM3_B/I equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in automotive, industrial, and telecom systems where AEC-Q101 qualification, halogen-free compliance, and MSL Level 1 moisture sensitivity are required.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (<1 µA leakage at 43 V), then rapidly avalanches below 52.8 V to clamp transient energy into ground. Its glass-passivated junction ensures stable breakdown characteristics and low incremental surge resistance.
The SMBJ43AHM3_B/I is rated for 100 A non-repetitive forward surge current (IFSM, 8.3 ms half-sine), supports continuous power dissipation of 5.0 W at 50 °C on infinite heatsink, and maintains operation across -55 °C to +150 °C junction temperature range - enabling use in under-hood automotive and high-ambient industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC rail margin for 48 V nominal systems. |
| VBR (min/max) | 47.8 V / 52.8 V at IT = 1 mA - Confirmed breakdown window ensures reliable triggering without premature conduction. |
| VC @ IPPM | 69.4 V at 8.6 A - Clamping voltage limits downstream IC stress during 10/1000 µs surge events. |
| PPPM | 600 W - Peak pulse power handling capability per standard 10/1000 µs waveform, supporting IEC 61000-4-5 Level 4 immunity. |
| IFSM | 100 A - Single half-sine surge rating enables protection against high-energy inductive kickback (e.g., solenoid drivers). |
| TJ max. | +150 °C - Enables placement near heat sources in engine control units and motor drives without derating. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.21 mm × 4.57 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads meet J-STD-002 solderability and JESD 22-B102 whisker resistance Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or return path; forms current sink during transient clamping. |
| Cathode | High-side protected node terminal | Connected to line being protected (e.g., 48 V rail or sensor input); band denotes cathode end per JEDEC DO-214AA standard. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Supports IEC 61000-4-5 surge immunity up to Level 4 (4 kV line-to-ground) without external series impedance. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC specification. |
| Halogen-free & RoHS-compliant | Meets EU RoHS Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing. |
| MSL Level 1 (260 °C peak reflow) | Enables single-pass lead-free reflow assembly without moisture-related popcorning or delamination. |
| Low clamping ratio (VC/VBR ≈ 1.36) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs (e.g., ADAS camera modules, body control units) from load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly across input rail, clamping surges within nanoseconds. Use Value: Withstands 100 A surge current and maintains clamping below 69.4 V, preventing brownout or reset of 5 V/3.3 V regulators downstream. |
Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors in PLC I/O modules exposed to field wiring noise. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA at 43 V) unidirectional clamp on signal lines referenced to local ground. Use Value: 47.8–52.8 V VBR window avoids false triggering while ensuring sub-70 V clamping during 1 kV EFT bursts. |
| Telecom DC Power Input Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Securing -48 V DC feed inputs in base station power supplies against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional TVS installed between input rail and chassis ground to divert surge energy away from upstream rectifiers. Use Value: 600 W rating handles repetitive 10/1000 µs surges per GR-1089-CORE; halogen-free construction meets telco environmental mandates. |
Use Scenario: Shielding high-side gate drivers in BLDC inverters from Miller-induced voltage spikes during MOSFET switching. IC Role / Device Role / Timing Role: Fast-response (sub-nanosecond) clamp across gate-source terminals to limit VGS excursion. Use Value: 69.4 V clamping voltage prevents gate oxide breakdown in 60 V-rated Si MOSFETs while maintaining <1 µA leakage at 43 V bias. |
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_B/I | Same electrical specs but RoHS-compliant commercial grade (not halogen-free or AEC-Q101 qualified). | Lacks automotive qualification and halogen-free certification; suitable for non-automotive industrial/commercial designs. | Select when AEC-Q101 and halogen-free requirements are not mandated, and cost optimization is prioritized. |
| SMAJ43AHE3/A | Lower 400 W PPPM, SMA (DO-214AC) package (smaller footprint, lower thermal mass), same VWM/VBR. | Reduced surge handling and thermal capacity; limited to lower-energy transients or space-constrained PCBs. | Choose only if board area is critical and peak surge energy remains ≤400 W; verify thermal derating at elevated ambient. |
Compared with SMBJ43AHE3_B/I, the SMBJ43AHM3_B/I adds halogen-free construction and AEC-Q101 qualification without sacrificing electrical performance; versus SMAJ43AHE3/A, it delivers 50 % higher surge power and superior thermal robustness in the larger SMB package - making it the preferred choice for automotive and high-reliability industrial deployments.
Availability
SMBJ43AHM3_B/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom power inputs, and motor drive gate protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ43AHM3_B/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 validation.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 compliance, precise clamping, and robust surge handling are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ43AHM3_B/I at its rated peak pulse current?
The SMBJ43AHM3_B/I has a maximum clamping voltage (VC) of 69.4 V at its specified peak pulse current (IPPM) of 8.6 A, measured using the standard 10/1000 µs double-exponential waveform. This value ensures protected circuits remain below critical overvoltage thresholds during surge events. The SMBJ43AHM3_B/I's low clamping ratio (VC/VBR ≈ 1.36) reflects optimized junction design for minimal overshoot.
Is SMBJ43AHM3_B/I qualified for automotive applications?
Yes, SMBJ43AHM3_B/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix in its ordering code - indicating halogen-free, RoHS-compliant, and automotive-grade reliability validation. It undergoes stress testing including temperature cycling, high-temperature reverse bias, and ESD per AEC-Q101 Rev D. The SMBJ43AHM3_B/I is intended for under-hood and chassis-mounted modules where extended temperature operation and long-term stability are required.
What does the "HM3_B/I" suffix indicate in SMBJ43AHM3_B/I?
The "HM3" denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction; "B" indicates revision level B per Vishay's internal change control; and "I" specifies packaging in 13-inch tape-and-reel format with 3200 units per reel. This full suffix confirms SMBJ43AHM3_B/I meets automotive environmental and logistics requirements - distinct from commercial-grade variants like SMBJ43AHE3_B/I which lack halogen-free and AEC-Q101 certifications.
Can SMBJ43AHM3_B/I be used in bidirectional protection configurations?
No, SMBJ43AHM3_B/I is strictly unidirectional, as indicated by the "A" suffix (vs. "CA" for bidirectional types). Its cathode band marks the high-side terminal, and it conducts only in reverse breakdown - it cannot suppress positive-going transients on grounded lines. For bidirectional protection at ~43 V, the correct variant is SMBJ43CAHM3_B/I, which exhibits symmetrical clamping in both polarities and uses different breakdown test methodology.
What is the thermal resistance from junction to ambient for SMBJ43AHM3_B/I?
The SMBJ43AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes no additional heatsinking; for sustained 5.0 W power dissipation, board layout must provide adequate copper area or forced airflow to maintain TJ ≤ 150 °C. The SMBJ43AHM3_B/I's RθJL of 20 °C/W further supports localized thermal relief via lead conduction.
SMBJ43AHM3_B/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:
- 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:
- 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_B/I FAQ
1.How can I place an order for SMBJ43AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43AHM3_B/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_B/I reliable?
The price and inventory of SMBJ43AHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ43AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43AHM3_B/I?
SMBJ43AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43AHM3_B/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_B/I?
For technical support, including SMBJ43AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ43AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ43AHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ43AHM3_B/I?
All SMBJ43AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43AHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for SMBJ43AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43AHM3_B/I Tags
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