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Vishay General Semiconductor - Diodes Division SMBJ45CAHM3_B/H
- Part No.:
- SMBJ45CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAHM3_B/H.pdf
- Description:
- 600W,45V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:2,727
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Product details
Overview
SMBJ45CAHM3_B/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power 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 industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ45CAHM3_B/H datasheet, SMBJ45CAHM3_B/H pinout, SMBJ45CAHM3_B/H application, or SMBJ45CAHM3_B/H equivalent, this device is selected for robust ESD and surge immunity in bidirectional AC-coupled or floating signal paths where low clamping voltage, fast response (<1 ns), and AEC-Q101-qualified reliability are required.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC lines, differential pairs, and ungrounded circuits without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at VWM), while the low incremental surge resistance supports consistent clamping performance under repetitive transients.
The device is rated for 150 °C maximum junction temperature and meets MSL Level 1 per J-STD-020 with 260 °C reflow peak. Its thermal resistance (RθJA = 100 °C/W) reflects standard SMB footprint thermal behavior on 0.2" × 0.2" copper pads, and it complies with UL 497B recognition (QVGQ2) for protector classification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before significant conduction begins; defines safe working range for protected circuit. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage during 10/1000 µs surge; determines worst-case stress on downstream components. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; validates capability against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at stand-off voltage; critical for low-power sensor and battery-backed circuits. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive and 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 placement. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals with identical electrical behavior in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; connected across protected line and return (e.g., Line1–Line2 or Line–Shield); no cathode band marking. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses (e.g., RS-485), and floating grounds without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) when properly mounted. |
| 72.7 V clamping voltage at 8.3 A | Limits transient energy delivered to ICs like microcontrollers or transceivers, reducing risk of latch-up or gate oxide damage. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive subsystems including body electronics and infotainment where reliability under thermal cycling is mandatory. |
| Halogen-free, RoHS-compliant | Meets environmental compliance requirements for industrial and consumer end equipment sold in EU, China, and North America. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of pressure/temperature sensors exposed to motor switching noise and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across signal and return traces to clamp common-mode transients before they reach ADC input or isolation barrier. Use Value: Prevents sensor calibration drift and microcontroller reset caused by >1 kV transients; maintains system uptime in factory automation. |
Use Scenario: Shielding RS-485 transceivers and Ethernet PHYs in outdoor base stations and DSLAMs from induced surges on twisted-pair cabling. IC Role / Device Role / Timing Role: Placed differentially across A/B lines and common-mode across A-GND/B-GND to suppress both differential and common-mode surges. Use Value: Enables compliance with ITU-T K.20/K.21 immunity standards; avoids field failures due to telecom line lightning strikes. |
| Automotive Body Control Module | Consumer Appliance Motor Drive |
|
Use Scenario: Safeguarding LIN bus nodes and window lift control circuits against load dump and inductive kickback in 12 V vehicle systems. IC Role / Device Role / Timing Role: Mounted directly at connector entry point to shunt transients before reaching LIN transceiver or MCU GPIO. Use Value: Meets ISO 7637-2 Pulse 1/2a/3a immunity requirements; eliminates intermittent communication loss in door modules. |
Use Scenario: Protecting microcontroller I/O and optocoupler inputs in washing machine and HVAC fan controllers subjected to relay contact bounce and motor commutation spikes. IC Role / Device Role / Timing Role: Connected between microcontroller input pins and mechanical switch contacts to absorb <100 ns spikes. Use Value: Reduces firmware-level debounce overhead and prevents false edge detection; extends product lifetime in high-vibration environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CAHE3_B/H | Same electrical specs and SMB package; RoHS-compliant but not halogen-free or AEC-Q101 qualified. | Approved for commercial/industrial use only; not certified for automotive under-hood deployment. | Select when AEC-Q101 qualification is unnecessary and cost sensitivity outweighs halogen-free requirement. |
| SMAJ45CAHM3 | Lower PPPM (400 W vs. 600 W); same VWM/VBR/VC; SMA (DO-214AC) package with smaller footprint (4.5 mm × 2.7 mm). | Less robust against high-energy surges; suitable for space-constrained consumer PCBs with lower threat levels. | Choose when board area is critical and surge exposure is limited to IEC 61000-4-2 ESD only - not recommended for IEC 61000-4-5. |
Compared with SMBJ45CAHE3_B/H, the SMBJ45CAHM3_B/H adds halogen-free construction and AEC-Q101 qualification without sacrificing clamping performance; versus SMAJ45CAHM3, it delivers 50 % higher surge power handling in a slightly larger but thermally superior SMB package.
Availability
SMBJ45CAHM3_B/H is available at Aetrix Electronics and suitable for industrial sensor interface, telecom line protection, and automotive body control module applications requiring stable component supply and long-term lifecycle support.
Supply support for SMBJ45CAHM3_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, 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 systems where failure resilience and standardized compliance (UL, AEC-Q101, IEC) are non-negotiable.
FAQ
What does the "CA" suffix indicate in SMBJ45CAHM3_B/H?
The "CA" suffix denotes a bidirectional configuration: SMBJ45CAHM3_B/H conducts symmetrically in both directions, making it suitable for protecting AC-coupled lines, differential buses, and ungrounded circuits. Unlike unidirectional variants (e.g., SMBJ45AHM3_B/H), it has no cathode marking and exhibits identical VBR and VC characteristics regardless of voltage polarity applied across its terminals.
Is SMBJ45CAHM3_B/H suitable for automotive applications?
Yes - the "HM3" suffix confirms SMBJ45CAHM3_B/H is halogen-free, RoHS-compliant, and AEC-Q101 qualified. It is validated for automotive subsystems including body control modules, lighting drivers, and infotainment interfaces where operation from −40 °C to +125 °C ambient and resistance to thermal cycling, vibration, and load dump transients are required.
How does SMBJ45CAHM3_B/H compare to SMAJ45CAHM3 in surge handling?
SMBJ45CAHM3_B/H delivers 600 W peak pulse power (10/1000 µs), whereas SMAJ45CAHM3 is rated for 400 W. This 50 % higher energy capacity allows SMBJ45CAHM3_B/H to withstand more severe surges such as IEC 61000-4-5 Level 4 (4 kV/2 kA), while SMAJ45CAHM3 is typically limited to Level 3 (2 kV/1 kA) in the same layout.
What is the maximum clamping voltage of SMBJ45CAHM3_B/H and under what test condition?
The maximum clamping voltage of SMBJ45CAHM3_B/H is 72.7 V, measured at 8.3 A peak pulse current using the standardized 10/1000 µs double-exponential waveform. This value represents the worst-case voltage imposed on protected circuitry during a surge event and is guaranteed across temperature and production lot variations.
Does SMBJ45CAHM3_B/H require a heatsink for normal operation?
No - SMBJ45CAHM3_B/H is designed for surface-mount operation without external heatsinking. Its RθJA of 100 °C/W assumes mounting on minimum recommended 0.2" × 0.2" copper pads per terminal. For continuous power dissipation, derating applies above 25 °C ambient; however, transient suppression is inherently short-duration and self-limiting.
SMBJ45CAHM3_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:
- -
- 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_B/H FAQ
1.How can I place an order for SMBJ45CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAHM3_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 SMBJ45CAHM3_B/H reliable?
The price and inventory of SMBJ45CAHM3_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 SMBJ45CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ45CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAHM3_B/H?
SMBJ45CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAHM3_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 SMBJ45CAHM3_B/H?
For technical support, including SMBJ45CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ45CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAHM3_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 SMBJ45CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ45CAHM3_B/H?
All SMBJ45CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAHM3_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 SMBJ45CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ45CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CAHM3_B/H Tags
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