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Vishay General Semiconductor - Diodes Division SMBJ45CAHM3_A/H
- Part No.:
- SMBJ45CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAHM3_A/H.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,867
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Product details
Overview
SMBJ45CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. 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 on power rails and signal lines in industrial sensor interfaces.
For engineers reviewing the SMBJ45CAHM3_A/H datasheet, SMBJ45CAHM3_A/H pinout, SMBJ45CAHM3_A/H application, or SMBJ45CAHM3_A/H equivalent, this device is selected for bidirectional surge immunity in automotive-grade industrial control modules, Ethernet PHY protection, and DC power input stages where low-leakage (<1.0 µA at VWM), fast response (<1 ns), and AEC-Q101 qualification are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, enabling clamping during positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5%), low incremental surge resistance, and repeatable clamping performance under repetitive 10/1000 µs surges at 0.01% duty cycle.
Thermally, it delivers 5.0 W steady-state power dissipation at TA = 50 °C with RθJA = 100 °C/W and RθJL = 20 °C/W, supporting reliable operation up to TJ = +150 °C. The halogen-free, RoHS-compliant HM3 suffix confirms compliance with JESD201 Class 2 whisker resistance and MSL Level 1 reflow profile (260 °C peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working margin. |
| VBR (min/max) | 50.0 V / 55.3 V at IT = 1 mA - Confirmed breakdown range ensuring predictable turn-on threshold under surge conditions. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage during 10/1000 µs transient; determines protected circuit's maximum stress level. |
| PPPM | 600 W - Peak pulse power handling capability; enables suppression of high-energy lightning-induced surges. |
| ID @ VWM | ≤1.0 µA - Ultra-low reverse leakage at rated stand-off voltage, minimizing standby power loss in battery-powered systems. |
| TJ max. | +150 °C - Maximum junction temperature; supports deployment in under-hood automotive and high-ambient industrial environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical anode/cathode terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Terminal 1) | Surge return path (bidirectional) | Provides low-impedance conduction path during negative transients; electrically identical to cathode in CA devices. |
| Cathode (Terminal 2) | Surge return path (bidirectional) | Provides low-impedance conduction path during positive transients; functionally interchangeable with anode in SMBJ45CAHM3_A/H. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity constraints. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when properly mounted on 5.0 mm × 5.0 mm copper pads. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics per stress test requirements including HTOL, TC, and HTRB. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for industrial and automotive OEMs; JESD201 Class 2 whisker resistance certified. |
| MSL Level 1 (260 °C peak) | Supports lead-free reflow assembly without pre-baking; eliminates moisture-related popcorning risk during PCB manufacturing. |
Applications
| Industrial Sensor Signal Protection | Automotive Body Control Module (BCM) Power Input |
|---|---|
|
Use Scenario: Protecting 24 V CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground, clamping transients within nanoseconds to limit voltage excursion below IC absolute maximum ratings. Use Value: Prevents latch-up or permanent damage to microcontrollers and interface ICs by holding clamped voltage ≤72.7 V during 8.3 A surges. |
Use Scenario: Safeguarding 12 V/24 V power inputs of BCM ECUs against ISO 7637-2 pulse 1, 2a, 3a/b, and load dump events. IC Role / Device Role / Timing Role: Primary front-end TVS connected directly across input rail and chassis ground, absorbing >90% of surge energy before downstream regulators. Use Value: Enables compliance with automotive EMC standards while maintaining <1.0 µA leakage to avoid battery drain in sleep mode. |
| Ethernet PHY Port Protection | DC Power Supply Rail Clamp |
|
Use Scenario: Shielding RJ45 magnetics and PHY ICs from ESD (IEC 61000-4-2 ±8 kV contact) and EFT (IEC 61000-4-4 ±2 kV) on 10/100BASE-TX pairs. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across each twisted pair, leveraging matched VBR symmetry for balanced clamping. Use Value: Maintains signal integrity by limiting capacitance to <100 pF at zero bias, avoiding data rate degradation in Fast Ethernet links. |
Use Scenario: Suppressing switching noise and cross-talk surges on regulated 3.3 V/5 V rails feeding FPGAs, ADCs, and precision analog circuits. IC Role / Device Role / Timing Role: Low-leakage TVS shunting rail-to-ground to clamp overshoot from LDO transients or hot-swap events. Use Value: Ensures system reliability by limiting VC to 72.7 V even during worst-case 600 W surges, preventing brownout or reset conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CAHE3_A/H | RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker certification. | Suitable for commercial-grade industrial equipment where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs automotive or green-material compliance needs. |
| SMAJ45CAHM3_A/H | Lower PPPM (400 W vs. 600 W); same VWM/VBR/VC specs; SMA package (smaller footprint, higher thermal resistance). | Preferred for space-constrained consumer electronics where full 600 W surge margin is unnecessary. | Choose only if board layout cannot accommodate SMB's larger pad area and thermal mass. |
Compared with SMBJ45CAHE3_A/H, the SMBJ45CAHM3_A/H adds halogen-free construction and whisker resistance for automotive use; versus SMAJ45CAHM3_A/H, it provides 50% higher surge power handling and lower RθJA - critical for sustained transient immunity in harsh environments.
Availability
SMBJ45CAHM3_A/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, Ethernet PHY protection, and DC power supply rail clamping requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ45CAHM3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series targets high-energy transient suppression in automotive, industrial, and telecom infrastructure, engineered for AEC-Q101 qualification, low clamping voltage, and robust surge endurance under real-world electrical stress.
FAQ
What does the "CA" suffix indicate in SMBJ45CAHM3_A/H?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ45CAHM3_A/H clamps voltage transients equally in both polarities, unlike unidirectional "A" variants that conduct only in reverse bias. This makes SMBJ45CAHM3_A/H ideal for protecting AC-coupled lines, differential buses, or floating nodes where polarity is undefined or alternating.
Is SMBJ45CAHM3_A/H suitable for automotive applications?
Yes - the HM3 suffix confirms SMBJ45CAHM3_A/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It has passed high-temperature operating life, temperature cycling, and humidity testing required for under-hood and body electronics, making SMBJ45CAHM3_A/H appropriate for 12 V/24 V power inputs and communication ports in automotive ECUs.
What is the maximum clamping voltage of SMBJ45CAHM3_A/H and at what current is it specified?
The maximum clamping voltage (VC) of SMBJ45CAHM3_A/H is 72.7 V, measured at a peak pulse current (IPPM) of 8.3 A using the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is guaranteed across the full operating temperature range.
How does the SMB package of SMBJ45CAHM3_A/H compare thermally to the SMA package?
SMBJ45CAHM3_A/H in the SMB (DO-214AA) package offers lower thermal resistance than SMA equivalents: RθJA = 100 °C/W versus ~150 °C/W for SMA, and RθJL = 20 °C/W versus ~30 °C/W. This allows SMBJ45CAHM3_A/H to sustain higher surge repetition rates and maintain lower junction temperatures during prolonged transient exposure.
Does SMBJ45CAHM3_A/H require a heatsink for standard operation?
No - SMBJ45CAHM3_A/H is designed for surface-mount operation without external heatsinking. Its 5.0 W steady-state power dissipation rating assumes mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, which provides sufficient thermal conduction. Additional copper pour or thermal vias further improves derating above TA = 25 °C.
SMBJ45CAHM3_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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ45CAHM3_A/H FAQ
1.How can I place an order for SMBJ45CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAHM3_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 SMBJ45CAHM3_A/H reliable?
The price and inventory of SMBJ45CAHM3_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 SMBJ45CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ45CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAHM3_A/H?
SMBJ45CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAHM3_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 SMBJ45CAHM3_A/H?
For technical support, including SMBJ45CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAHM3_A/H requirements.
6.How does Aetrix verify that SMBJ45CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAHM3_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 SMBJ45CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ45CAHM3_A/H?
All SMBJ45CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAHM3_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 SMBJ45CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ45CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CAHM3_A/H Tags
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