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Vishay General Semiconductor - Diodes Division SMBJ45AHM3/H
- Part No.:
- SMBJ45AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AHM3/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,955
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Product details
Overview
SMBJ45AHM3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. 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 - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMBJ45AHM3/H datasheet, SMBJ45AHM3/H pinout, SMBJ45AHM3/H application, or SMBJ45AHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), clamping performance under surge conditions, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This TVS diode operates as a unidirectional clamping device, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response time and low incremental surge resistance. Its 72.7 V clamping voltage at 8.3 A ensures reliable protection of downstream 48 V nominal systems against ISO 7637-2 pulse 1/2a/5a transients.
The SMBJ45AHM3/H is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020 (260 °C reflow peak), and supports automated SMT placement with matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse working voltage before leakage exceeds 1.0 μA; defines safe operating margin for 48 V rail protection. |
| VBR (min/max) | 50.0 V / 55.3 V at IT = 1 mA - Confirmed breakdown range ensures consistent turn-on behavior across production lots. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamping voltage during 10/1000 μs surge; limits stress on protected ICs to <73 V under worst-case 600 W transient. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 μs waveform; enables compliance with IEC 61000-4-5 Level 4 (4 kV) when properly mounted. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| TJ max. | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments. |
| IFSM | 100 A - Non-repetitive forward surge current rating (8.3 ms half-sine); validates robustness against load dump events. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with cathode band marking on unidirectional devices. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), 0.220" × 0.155" × 0.086".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential node; conducts during positive transients when cathode is biased higher. |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 48 V rail); initiates avalanche breakdown when voltage exceeds VBR, shunting surge to ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock - required for engine control and ADAS power domains. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets IPC-JEDEC J-STD-020 MSL Level 1 and JESD201 Class 2 whisker resistance - ensures long-term solder joint integrity in high-reliability assemblies. |
| 600 W peak pulse power (10/1000 μs) | Enables single-device protection against severe transients like ISO 7637-2 Pulse 5a (load dump), reducing BOM count vs. multi-stage solutions. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during clamping - critical for safeguarding 50 V-rated MOSFETs and CAN FD transceivers. |
| Glass passivated junction | Provides stable leakage (<1.0 μA at VWM) and repeatable VBR over lifetime - essential for low-power always-on sensor nodes. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 48 V battery-fed ECUs from load dump transients up to 60 V and ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between input rail and chassis ground. Use Value: Limits voltage seen by downstream DC-DC converters to ≤72.7 V during 100 ms surges, preventing latch-up or gate oxide damage. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation PLC modules. IC Role / Device Role / Timing Role: Low-capacitance (typ. 120 pF at 0 V) clamping element on 0–10 V or 4–20 mA outputs. Use Value: Suppresses ESD (IEC 61000-4-2 ±8 kV contact) and fast transients without distorting low-bandwidth analog signals. |
| Telecom DC Power Feeds | Motor Drive Gate Driver Supply Rails |
|
Use Scenario: Safeguarding -48 V telecom rectifier outputs against lightning-induced surges on central office equipment. IC Role / Device Role / Timing Role: Standoff-rated TVS on primary-side DC bus, coordinated with upstream MOVs. Use Value: Provides precise 45 V clamping threshold and 600 W energy absorption - avoids premature triggering while ensuring fail-safe shutdown. |
Use Scenario: Protecting isolated gate driver supplies (e.g., 15 V) feeding SiC MOSFET half-bridges in servo inverters. IC Role / Device Role / Timing Role: Fast-response unidirectional suppressor on low-inductance gate supply traces. Use Value: Clamps ringing and cross-talk spikes within 1 ns, preventing false turn-on and shoot-through in high-dV/dt switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45AHE3/H | Same electrical specs, but RoHS-compliant (not halogen-free); lacks JESD201 Class 2 whisker qualification. | Suitable for commercial/industrial use where halogen-free requirement is absent; not approved for automotive AEC-Q101 programs. | Select SMBJ45AHE3/H only if halogen content and whisker resistance are non-critical for the target application. |
| SMAJ45A-M3/H | Lower PPPM (400 W), higher RθJA (140 °C/W), same VWM/VBR/VC; SMA (DO-214AC) package with smaller footprint (4.32 mm × 2.62 mm). | Better suited for space-constrained consumer electronics; insufficient for automotive load dump due to reduced power handling. | Choose SMAJ45A-M3/H only when board area is constrained and surge energy remains below 400 W. |
Compared with SMBJ45AHE3/H and SMAJ45A-M3/H, the SMBJ45AHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and full 600 W surge capability - making it the sole option for automotive 48 V systems requiring both regulatory compliance and robust transient immunity.
Availability
SMBJ45AHM3/H is available at Aetrix Electronics and suitable for automotive ECU power inputs, industrial sensor signal conditioning, telecom DC feeds, and motor drive gate supply rails requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ45AHM3/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure tolerance and long-term stability are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ45AHM3/H under a 10/1000 μs surge?
The SMBJ45AHM3/H has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current with a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for validating compatibility with 50 V-rated components downstream of SMBJ45AHM3/H.
Is SMBJ45AHM3/H qualified for automotive applications?
Yes, SMBJ45AHM3/H 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 temperature cycling, high-temperature operating life, and mechanical shock - making SMBJ45AHM3/H suitable for under-hood and chassis-mounted automotive modules.
What does the "HM3" suffix indicate for SMBJ45AHM3/H?
The "HM3" suffix in SMBJ45AHM3/H denotes halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance requirements, alongside MSL Level 1 moisture sensitivity rating (260 °C peak reflow). It distinguishes SMBJ45AHM3/H from "HE3" (RoHS only) and "E3" (commercial RoHS) variants - confirming suitability for high-reliability automotive and industrial deployments.
How does SMBJ45AHM3/H differ from SMBJ45A-M3/H?
SMBJ45AHM3/H and SMBJ45A-M3/H share identical electrical specifications (VWM = 45 V, VC = 72.7 V, PPPM = 600 W), but SMBJ45AHM3/H adds AEC-Q101 qualification and stricter halogen-free compliance. The "H" in SMBJ45AHM3/H indicates tape-and-reel packaging in 7" reels (750 units), whereas SMBJ45A-M3/H may ship in alternate reel sizes - impacting logistics for high-volume automotive builds.
What is the thermal resistance of SMBJ45AHM3/H, and how does it affect layout?
SMBJ45AHM3/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 requires PCB designers to allocate sufficient copper area and avoid thermal bottlenecks - especially in automotive applications where ambient temperatures exceed 85 °C and sustained power dissipation must remain below 5.0 W to prevent exceeding TJ max. of +150 °C.
SMBJ45AHM3/H 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):
- 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/H FAQ
1.How can I place an order for SMBJ45AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AHM3/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/H reliable?
The price and inventory of SMBJ45AHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMBJ45AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AHM3/H?
SMBJ45AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AHM3/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/H?
For technical support, including SMBJ45AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AHM3/H requirements.
6.How does Aetrix verify that SMBJ45AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ45AHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMBJ45AHM3/H?
All SMBJ45AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AHM3/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/H part is unused and in its original packaging.
Return procedure for SMBJ45AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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