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Vishay General Semiconductor - Diodes Division SMBJ45AHM3_A/H
- Part No.:
- SMBJ45AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AHM3_A/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,241
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Product details
Overview
SMBJ45AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and lightning-induced surges on power and signal lines. It features 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ45AHM3_A/H datasheet, SMBJ45AHM3_A/H pinout, SMBJ45AHM3_A/H application, or SMBJ45AHM3_A/H equivalent, this part delivers verified AEC-Q101 qualified surge protection with halogen-free RoHS compliance, low incremental surge resistance, and fast response time suitable for automotive-grade embedded power rail hardening and I/O line safeguarding.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction to achieve sub-nanosecond response and stable clamping under repetitive 0.01% duty cycle surges. Its thermal resistance (RθJA = 100 °C/W) and junction temperature range (–55 °C to +150 °C) support operation in high-ambient environments without forced cooling when mounted on 5.0 mm × 5.0 mm copper pads.
The SMBJ45AHM3_A/H complies with ANSI/IEEE C62.35 surge standards and meets UL 497B recognition (QVGQ2, E136766) for protector classification. Its M3 suffix confirms halogen-free, RoHS-compliant construction and JESD201 Class 2 whisker resistance, while the "HM3" ordering code denotes AEC-Q101 qualification and 7" tape-and-reel packaging (750 units per reel).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 µA; defines safe DC bias margin for 48 V nominal systems. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown threshold window; ensures reliable turn-on above system overvoltage thresholds. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage during 10/1000 µs surge; limits downstream stress on 75 V-rated components. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 surge immunity testing. |
| IFSM | 100 A - Non-repetitive forward surge current (8.3 ms half-sine); withstands inrush events in DC power distribution paths. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial enclosures without derating. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline (5.21 mm × 4.06 mm × 2.20 mm) compatible with automated pick-and-place and reflow profiles up to 260 °C peak. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102; polarity indicated by cathode band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; forms clamping loop with cathode during transient events. |
| Cathode | High-side connection point | Connected to protected line (e.g., 48 V rail or sensor output); conducts surge current to ground when VIN > VC. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Enables single-device protection against IEC 61000-4-5 4 kV surge tests on 50 Ω source impedance without external series impedance. |
| 72.7 V clamping voltage at 8.3 A | Keeps protected 75 V logic rails and gate drivers within safe operating area during worst-case transients. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics applications requiring zero defect reliability and extended temperature cycling. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow without moisture sensitivity concerns or baking preconditioning. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
Use Scenario: Protects 48 V supply inputs and LIN bus lines in BCMs exposed to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed directly at connector entry point before LDO regulators and microcontroller I/O. Use Value: Limits transient overshoot to ≤72.7 V, preventing latch-up or gate oxide damage in 5 V/3.3 V domain ICs powered from buck-converted 48 V rails. |
Use Scenario: Shields 24 V digital input channels of programmable logic controllers from field-wiring induced surges and relay coil kickback. IC Role / Device Role / Timing Role: Primary front-end surge clamp on each optocoupler input channel, sized to absorb 600 W pulses without degradation. Use Value: Maintains <1 µA leakage at 45 V, ensuring clean logic-level detection while surviving repeated 1 kV/500 A surge events per IEC 61000-4-4. |
| Telecom Power Supply OVP Circuit | Motor Drive Gate Driver Protection |
Use Scenario: Guards secondary-side 48 V DC-DC outputs in telecom rectifiers against lightning-induced common-mode transients on -48 V return paths. IC Role / Device Role / Timing Role: Standoff-clamp TVS connected between output rail and chassis ground, triggered only during overvoltage excursions. Use Value: Provides 50.0–55.3 V VBR tolerance matching telecom nominal voltage tolerances, avoiding false triggering during normal regulation ripple. |
Use Scenario: Safeguards isolated gate driver inputs (e.g., SiC MOSFET drivers) from Miller-induced dv/dt coupling and shoot-through transients. IC Role / Device Role / Timing Role: Local clamping device placed adjacent to driver IC VDD pin, limiting supply rail spikes to 72.7 V during fast switching transitions. Use Value: Fast response (<1 ns) prevents gate oxide overstress during <100 ns transient events typical in high-frequency SiC inverters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45AHE3_A/H | Same electrical specs but E3 suffix: RoHS-compliant, commercial-grade (non-AEC-Q101), tin-lead free but not halogen-free. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMBJ45AHE3_A/H for cost-sensitive non-automotive applications requiring identical clamping performance without halogen-free requirement. |
| SMBJ45CAHM3_A/H | Bidirectional variant with same VWM (45 V), but symmetrical clamping in both polarities; VC = 72.7 V at ±8.3 A. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN FD) where reverse polarity surges occur. | Choose SMBJ45CAHM3_A/H only when protecting bidirectional data lines or transformer-coupled circuits needing equal positive/negative clamping. |
Compared with SMBJ45AHM3_A/H, the E3 variant offers identical surge capability without AEC-Q101 validation or halogen-free assurance, while the CAHM3 variant provides bidirectional symmetry at the expense of unidirectional optimization - making SMBJ45AHM3_A/H the preferred choice for grounded 48 V DC systems requiring automotive-grade reliability.
Availability
SMBJ45AHM3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, telecom power supply overvoltage safeguarding, and motor drive gate driver hardening requiring stable component supply across multi-year production cycles.
Supply support for SMBJ45AHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on high-reliability and automotive-qualified solutions.
The SMBJ series is engineered for robust transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where standardized 600 W surge handling and AEC-Q101 compliance are mandatory design requirements.
FAQ
What is the clamping voltage of SMBJ45AHM3_A/H at its rated peak pulse current?
The SMBJ45AHM3_A/H has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 72.7 V during a full-power surge event, making SMBJ45AHM3_A/H suitable for protecting 75 V-rated devices in 48 V systems.
Is SMBJ45AHM3_A/H qualified for automotive applications?
Yes, SMBJ45AHM3_A/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and Vishay's official documentation. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - validating SMBJ45AHM3_A/H for use in automotive body control modules, infotainment power supplies, and ADAS sensor interface protection where zero-defect reliability is required.
What does the "HM3" suffix in SMBJ45AHM3_A/H indicate?
The "HM3" suffix in SMBJ45AHM3_A/H specifies halogen-free, RoHS-compliant construction with AEC-Q101 qualification and 7" tape-and-reel packaging (750 units per reel). It distinguishes SMBJ45AHM3_A/H from E3 (RoHS, commercial grade) and HE3 (RoHS + AEC-Q101, non-halogen-free) variants - confirming that SMBJ45AHM3_A/H meets strict environmental and automotive reliability mandates simultaneously.
Can SMBJ45AHM3_A/H be used in bidirectional signal protection?
No, SMBJ45AHM3_A/H is a unidirectional TVS diode, intended for DC-biased lines where surge polarity is known and consistent (e.g., 48 V supply rails). For bidirectional signal lines like RS-485 or CAN, the bidirectional variant SMBJ45CAHM3_A/H must be used instead - it provides symmetrical clamping but is not interchangeable with SMBJ45AHM3_A/H due to different polarity behavior and marking conventions.
What is the thermal resistance and maximum junction temperature of SMBJ45AHM3_A/H?
SMBJ45AHM3_A/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, and a maximum junction temperature (TJ) of +150 °C. These values allow SMBJ45AHM3_A/H to operate reliably in sealed enclosures up to +105 °C ambient without active cooling, provided PCB layout follows Vishay's recommended pad dimensions and thermal vias are used for higher-power scenarios.
SMBJ45AHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMBJ45AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AHM3_A/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_A/H reliable?
The price and inventory of SMBJ45AHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ45AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AHM3_A/H?
SMBJ45AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AHM3_A/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_A/H?
For technical support, including SMBJ45AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AHM3_A/H requirements.
6.How does Aetrix verify that SMBJ45AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ45AHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ45AHM3_A/H?
All SMBJ45AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ45AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45AHM3_A/H Tags
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