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Vishay General Semiconductor - Diodes Division SMBJ45AHM3_B/H
- Part No.:
- SMBJ45AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AHM3_B/H.pdf
- Description:
- 600W,45V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:8,779
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Product details
Overview
SMBJ45AHM3_B/H 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 a 45 V stand-off voltage (VWM), 50.0–55.3 V breakdown voltage (VBR) at 1 mA, 72.7 V maximum clamping voltage (VC) at 8.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMBJ45AHM3_B/H datasheet, SMBJ45AHM3_B/H pinout, SMBJ45AHM3_B/H application, or SMBJ45AHM3_B/H equivalent, this device is selected for robust overvoltage protection on DC power rails, MOSFET gate drivers, and sensor signal lines in industrial control, automotive subsystems, and telecom infrastructure where AEC-Q101 qualification and halogen-free compliance 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 repetitive surge conditions. Its thermal resistance (RθJA = 100 °C/W) and low incremental surge resistance enable effective energy absorption without thermal runaway during transient events.
The SMBJ45AHM3_B/H is rated for -55 °C to +150 °C operating junction temperature, supports 100 A non-repetitive forward surge current (IFSM), and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its halogen-free, RoHS-compliant construction (HM3 suffix) and AEC-Q101 qualification confirm suitability for automotive-grade designs requiring long-term reliability under harsh environmental stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before clamping initiates; defines safe DC rail operating margin. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lots. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage during 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| 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 current rating (8.3 ms); supports motor drive and relay coil suppression. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive or high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-indicated by band. Dimensions: 5.59 mm × 4.06 mm × 2.20 mm (L × W × H). Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes clamping loop when transient exceeds VWM. |
| Cathode | High-side connection point | Connected to protected line (e.g., 45 V rail); band marking identifies this terminal for correct PCB orientation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronic modules including body control units and ADAS sensor interfaces. |
| Halogen-free & RoHS-compliant (HM3) | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports green manufacturing requirements. |
| 600 W peak pulse power (10/1000 μs) | Withstands repeated 4 kV EFT bursts and 1 kV lightning surges per IEC 61000-4-4/5 without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream ICs such as microcontrollers and CAN transceivers during clamping. |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns; eliminates bake-out requirement. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate driver ICs and bootstrap circuits against inductive kickback from BLDC motor windings. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between high-side gate and source. Use Value: Limits transient voltage to ≤72.7 V, preventing gate oxide rupture in 60 V-rated MOSFETs during 100 A turn-off events. |
Use Scenario: Surge suppression on LIN bus lines and 12 V power inputs in door module ECUs. IC Role / Device Role / Timing Role: Standoff protector on supply rail upstream of LDO regulators and microcontrollers. Use Value: Maintains system uptime during load dump (ISO 7637-2 Pulse 5a) by clamping 60 V transients to safe levels within 1 ns response time. |
| Telecom Power Supplies | Industrial Sensor Signal Conditioning |
Use Scenario: Input-stage protection for 48 V DC-DC converters in base station power distribution units. IC Role / Device Role / Timing Role: Primary overvoltage clamp on secondary-side output rail before point-of-load regulation. Use Value: Absorbs 600 W surges without failure, preserving converter stability and avoiding brownout-induced resets. |
Use Scenario: Reverse-polarity and ESD protection on analog outputs of 4–20 mA current-loop transmitters. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional TVS (cathode grounded) guarding 24 V loop supply input. Use Value: Blocks >800 V transients while maintaining <1 μA leakage at 45 V, ensuring mA-loop accuracy and calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45AHE3_B/H | Same electrical specs but RoHS-compliant (E3), not halogen-free; lacks AEC-Q101 qualification. | Approved for commercial/industrial use only; unsuitable for automotive OEM programs requiring PPAP documentation. | Select when halogen-free content or automotive qualification is not required; lower cost alternative for non-automotive BOMs. |
| SMAJ45A-M3/A | Lower 400 W PPPM rating; SMA package (smaller footprint, higher RθJA = 140 °C/W). | Limited to lower-energy transients; not recommended for IEC 61000-4-5 Level 4 or automotive load dump. | Choose only for space-constrained consumer applications with <400 W surge exposure and ambient <85 °C. |
Compared with SMBJ45AHM3_B/H, the SMBJ45AHE3_B/H offers identical clamping performance but no halogen-free or automotive qualification, while the SMAJ45A-M3/A sacrifices 33 % pulse power headroom and thermal robustness for smaller board area-making SMBJ45AHM3_B/H the optimal choice for mission-critical 45 V rail protection where reliability and regulatory compliance are mandatory.
Availability
SMBJ45AHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ45AHM3_B/H 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, power efficiency, and automotive-grade validation.
The SMBJ series was developed specifically for high-energy transient suppression in automotive, industrial, and telecom systems where consistent clamping, low leakage, and AEC-Q101 compliance are essential design requirements.
FAQ
What is the maximum clamping voltage of SMBJ45AHM3_B/H under standard test conditions?
The SMBJ45AHM3_B/H has a maximum clamping voltage (VC) of 72.7 V when subjected to an 8.3 A peak pulse current with a 10/1000 μs waveform. This value is measured at TA = 25 °C and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ45AHM3_B/H maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C), ensuring consistent protection in demanding environments.
Is SMBJ45AHM3_B/H suitable for automotive applications?
Yes, SMBJ45AHM3_B/H is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials (HM3 suffix), making it suitable for automotive applications including body control modules, lighting drivers, and infotainment power rails. Its 150 °C maximum junction temperature, MSL Level 1 rating, and validated surge performance under ISO 7637-2 load dump conditions confirm its readiness for under-hood and chassis-mounted deployments. The SMBJ45AHM3_B/H meets all stress-test requirements defined in the AEC-Q101 standard for discrete semiconductors.
How does the SMBJ45AHM3_B/H differ from the SMBJ45A-E3 variant?
The SMBJ45AHM3_B/H differs from SMBJ45A-E3 in three key ways: it uses halogen-free molding compound (HM3 vs. E3), carries AEC-Q101 qualification (not present in E3), and is supplied on 7" tape-and-reel with packaging code "H". Electrically, both share identical VWM (45 V), VBR (50.0–55.3 V), and VC (72.7 V) specifications. The SMBJ45AHM3_B/H is therefore the preferred version for automotive Tier 1 suppliers and industrial programs requiring halogen-free compliance and formal automotive qualification-whereas SMBJ45A-E3 serves general-purpose commercial applications.
What is the thermal resistance of SMBJ45AHM3_B/H, and how does it affect layout design?
The SMBJ45AHM3_B/H 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 directly impacts PCB copper pour sizing: to sustain continuous 5.0 W power dissipation without exceeding TJ max. = 150 °C at TA = 50 °C, designers must allocate ≥250 mm² of thermal pad area per terminal with internal plane connections. The SMBJ45AHM3_B/H's RθJL of 20 °C/W further supports efficient heat conduction to PCB traces, reducing localized hot spots during repetitive surge events.
Can SMBJ45AHM3_B/H be used in bidirectional protection configurations?
No, SMBJ45AHM3_B/H is a unidirectional TVS diode, indicated by its "A" suffix and cathode band marking. It conducts only in reverse bias above VBR and blocks forward current beyond VF ≈ 3.5 V at 50 A. For bidirectional protection (e.g., AC lines or differential data buses), the CA-suffixed variant SMBJ45CA must be used instead. Attempting to use SMBJ45AHM3_B/H in bidirectional roles risks forward conduction, excessive leakage, or failure to clamp negative transients-so the SMBJ45AHM3_B/H must be oriented with cathode toward the protected line and anode to ground in all applications.
SMBJ45AHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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)
SMBJ45AHM3_B/H FAQ
1.How can I place an order for SMBJ45AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AHM3_B/H 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 SMBJ45AHM3_B/H reliable?
The price and inventory of SMBJ45AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ45AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AHM3_B/H?
SMBJ45AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AHM3_B/H 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 SMBJ45AHM3_B/H?
For technical support, including SMBJ45AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ45AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ45AHM3_B/H 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 SMBJ45AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ45AHM3_B/H?
All SMBJ45AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AHM3_B/H, 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 SMBJ45AHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ45AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45AHM3_B/H Tags
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