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Vishay General Semiconductor - Diodes Division SMBJ45AHM3_B/I
- Part No.:
- SMBJ45AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45AHM3_B/I.pdf
- Description:
- 600W,45V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,491
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Product details
Overview
SMBJ45AHM3_B/I 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.
For engineers reviewing the SMBJ45AHM3_B/I datasheet, SMBJ45AHM3_B/I pinout, SMBJ45AHM3_B/I application, or SMBJ45AHM3_B/I equivalent, key selection considerations include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low incremental surge resistance, and suitability for automotive power line and industrial sensor interface protection where fast response (<1 ns), high surge immunity, and stable clamping under repetitive transients are required.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, leveraging a glass-passivated junction to deliver sub-nanosecond response to ESD and lightning-induced transients. Its 100 °C/W junction-to-ambient thermal resistance and 20 °C/W junction-to-lead resistance support reliable operation up to 150 °C junction temperature under defined PCB pad layouts.
The device complies with ANSI/IEEE C62.35 surge standards and meets J-STD-020 MSL Level 1 moisture sensitivity with 260 °C reflow peak. The HM3 suffix confirms halogen-free, RoHS-compliant materials and AEC-Q101 qualification-critical for automotive body electronics and engine control module interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 45 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC rail operating margin. |
| VBR (Breakdown Voltage) | 50.0–55.3 V at 1 mA - Guaranteed avalanche initiation range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 72.7 V at 8.3 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; limits stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 600 W - Sustains 10/1000 µs surges without failure; enables protection against IEC 61000-4-5 Level 4 (4 kV) transients. |
| IPPM (Peak Pulse Current) | 8.3 A - Maximum non-repetitive surge current handled at rated clamping voltage; correlates directly with system-level surge immunity. |
| TJmax | 150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.0 mm × 5.0 mm copper pad requirement; compatible with automated SMT assembly. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or lower-potential node in unidirectional configuration; conducts surge current to reference plane. |
| Cathode | Avalanche clamping terminal | Connected to protected line (e.g., 45 V supply rail); initiates breakdown when voltage exceeds VBR, shunting surge energy. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity requirements for industrial and automotive power inputs. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, humidity bias, and mechanical shock per AEC test plan. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20D; eliminates brominated flame retardants for safer end-of-life processing. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without preconditioning; eliminates moisture-related popcorning during assembly. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 45 V battery-fed ECUs (e.g., HVAC actuators, lighting modules) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power input and ground, absorbing >100 V transients within nanoseconds. Use Value: Limits voltage seen by downstream DC/DC converters and microcontrollers to ≤72.7 V, preventing permanent damage during 12 V system load dump events. |
Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in PLC I/O modules from field-wiring induced surges. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line to chassis ground, activated only during overvoltage excursions exceeding 45 V. Use Value: Maintains signal integrity below 1 µA leakage at 45 V while clamping 8.3 A transients to 72.7 V-preserving ADC accuracy and avoiding false triggers. |
| Telecom DC Power Input Protection | Consumer Device USB Power Rail Protection |
|
Use Scenario: Safeguarding PoE-powered network switches and base stations against AC/DC adapter transients and lightning-coupled surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 48 V DC input rail, coordinated with upstream fuse and downstream filtering. Use Value: Withstands 600 W surges without degradation, enabling single-stage protection architecture that reduces BOM count and board space vs. multi-stage designs. |
Use Scenario: Protecting USB-C PD power delivery circuits (e.g., 20 V @ 5 A mode) in portable monitors and docking stations. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line, positioned after EMI filter but before buck converter input capacitor. Use Value: Clamps 10/1000 µs surges to 72.7 V while maintaining <1 µA leakage at 45 V-ensuring no standby current drain and no interference with PD negotiation. |
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/I | Same electrical specs and SMB package, but RoHS-compliant (E3) without halogen-free certification; not AEC-Q101 qualified. | Suitable for commercial/industrial use where automotive qualification is unnecessary; lower cost for non-automotive BOMs. | Select SMBJ45AHE3_B/I when AEC-Q101 and halogen-free requirements are waived, and cost optimization is prioritized. |
| SMAJ45A-M3 | Lower 400 W PPPM, SMA (DO-214AC) package (smaller footprint, higher RθJA = 140 °C/W), same VWM/VC ratings. | Better suited for space-constrained consumer PCBs with lower surge exposure; not recommended for automotive or industrial 600 W surge environments. | Choose SMAJ45A-M3 only for compact, low-duty-cycle applications where 400 W rating suffices and thermal margin allows higher junction rise. |
Compared with SMBJ45AHM3_B/I, SMBJ45AHE3_B/I offers identical protection performance without automotive qualification or halogen-free assurance, while SMAJ45A-M3 trades 33 % lower surge capability and reduced thermal robustness for smaller size-making SMBJ45AHM3_B/I the optimal choice for AEC-Q101–mandated, high-reliability 600 W surge protection.
Availability
SMBJ45AHM3_B/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, telecom power supplies, and consumer USB-C PD systems requiring stable component supply across extended production lifecycles.
Supply support for SMBJ45AHM3_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 optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments-targeting automotive, industrial, and telecom applications where consistent clamping, long-term stability, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ45AHM3_B/I at its rated peak pulse current?
The SMBJ45AHM3_B/I 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 under standardized test conditions and defines the upper voltage limit imposed on the protected circuit during a full-rated surge event. The SMBJ45AHM3_B/I maintains this clamping performance across its specified operating temperature range and after repeated surges within its duty cycle limit (0.01 %).
Is SMBJ45AHM3_B/I suitable for automotive applications?
Yes, SMBJ45AHM3_B/I is AEC-Q101 qualified and carries the HM3 suffix, confirming halogen-free, RoHS-compliant construction and validation for automotive-grade reliability-including temperature cycling, mechanical shock, and humidity testing. It is explicitly intended for use in automotive power distribution, body control modules, and sensor interfaces where sustained operation at 150 °C junction temperature and immunity to load dump transients are required. The SMBJ45AHM3_B/I meets these criteria without derating.
What does the "HM3" suffix mean in SMBJ45AHM3_B/I?
The "HM3" suffix in SMBJ45AHM3_B/I denotes halogen-free, RoHS-compliant materials and AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS-compliant only) and HE3 (AEC-Q101 + RoHS) versions. HM3 ensures compliance with JEDEC J-STD-20D MSL Level 1, JESD 201 Class 2 whisker resistance, and UL 94 V-0 flammability-making SMBJ45AHM3_B/I appropriate for safety-critical and environmentally regulated deployments where material content and long-term reliability are audited.
How does SMBJ45AHM3_B/I compare to bidirectional TVS diodes like SMBJ45CA?
SMBJ45AHM3_B/I is unidirectional and optimized for DC power line protection where polarity is fixed (e.g., 45 V supply to ground), offering lower leakage and tighter VBR tolerance than bidirectional variants. In contrast, SMBJ45CA protects AC or polarity-agnostic signals but exhibits higher reverse leakage and symmetric clamping in both directions. For 45 V DC rails, SMBJ45AHM3_B/I delivers superior standoff stability and lower system-level noise coupling-making it the preferred choice unless bipolar transient suppression is explicitly required.
What PCB layout guidance applies to SMBJ45AHM3_B/I for optimal thermal and surge performance?
For optimal performance, SMBJ45AHM3_B/I must be mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. This pad area ensures the rated 600 W peak pulse power and 100 °C/W thermal resistance are achieved. Traces to the device should be short and wide to minimize inductance, and ground connections must be low-impedance. Avoid thermal reliefs on pads; use solid copper pours tied to internal ground planes via multiple vias. The SMBJ45AHM3_B/I cathode band must align with the protected line's polarity to prevent forward conduction during normal operation.
SMBJ45AHM3_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):
- 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/I FAQ
1.How can I place an order for SMBJ45AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45AHM3_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 SMBJ45AHM3_B/I reliable?
The price and inventory of SMBJ45AHM3_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 SMBJ45AHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ45AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45AHM3_B/I?
SMBJ45AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45AHM3_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 SMBJ45AHM3_B/I?
For technical support, including SMBJ45AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ45AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ45AHM3_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 SMBJ45AHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ45AHM3_B/I?
All SMBJ45AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45AHM3_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 SMBJ45AHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ45AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45AHM3_B/I Tags
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