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Vishay General Semiconductor - Diodes Division SMBJ45CAHM3/I
- Part No.:
- SMBJ45CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAHM3/I.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,639
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Product details
Overview
SMBJ45CAHM3/I 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 signal or power lines. It features a 45 V standoff 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/I datasheet, SMBJ45CAHM3/I pinout, SMBJ45CAHM3/I application, or SMBJ45CAHM3/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering consistent clamping performance across positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), critical for protecting sensitive analog inputs and digital I/O against ESD and inductive switching spikes.
The device is rated for repetitive surge duty cycle of 0.01 % and derates linearly above 25 °C ambient per Fig. 2, with maximum junction temperature of +150 °C and storage range from –55 °C to +150 °C. Mounting on minimum recommended 0.2" × 0.2" copper pads achieves specified 600 W pulse power handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below system rail. |
| VBR (min/max) | 50.0 V / 55.3 V at 1 mA - Confirmed breakdown threshold range ensuring reliable turn-on during overvoltage events. |
| VC @ IPPM | 72.7 V at 8.3 A - Clamped voltage under 10/1000 µs surge; limits stress on downstream ICs like microcontrollers or RS-485 transceivers. |
| PPPM | 600 W - Peak pulse power dissipation capability with standard 10/1000 µs waveform; supports robust lightning/surge immunity. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage at standoff voltage, minimizing standby power loss in battery-powered sensors. |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in high-ambient industrial environments (e.g., motor drives, PLCs). |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on standard PCB pad layout; informs thermal design margin for sustained surges. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C peak reflow). Matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102. Bidirectional type - no polarity marking on body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative excursions; symmetrical with cathode for bidirectional clamping. |
| Cathode | Transient current entry (positive polarity) | Accepts forward surge current during positive excursions; identical clamping behavior as anode due to bidirectional construction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., CAN bus, RS-485) without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge events when properly mounted on recommended copper area. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for under-hood modules. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V or 5 V logic interfaces. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profile (peak 260 °C), eliminating bake requirements in SMT production. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loop) and digital I/O (e.g., LIN bus) from load dump and inductive kickback in factory automation systems. IC Role / Device Role / Timing Role: Primary transient clamp placed directly at connector entry point, shunting surge energy to ground before reaching ADC or MCU GPIO. Use Value: Prevents latch-up or permanent damage to precision op-amps and SAR ADCs by limiting voltage excursion to ≤72.7 V during 8.3 A surges. |
Use Scenario: Safeguarding LIN transceivers and microcontroller I/O pins in door module ECUs exposed to ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between LIN data line and chassis ground, providing symmetrical clamping for ±100 V transients. Use Value: Maintains signal integrity during cold-crank and load-dump events while meeting AEC-Q101 qualification for automotive deployment. |
| Telecom Line Protection | Consumer USB Port ESD Clamp |
|
Use Scenario: Shielding RS-485 transceiver inputs in networked building control systems from induced lightning surges on long cable runs. IC Role / Device Role / Timing Role: First-line defense at physical layer interface, absorbing up to 600 W of transient energy before it reaches isolated data couplers. Use Value: Enables >15 kV contact ESD immunity (IEC 61000-4-2) and 1 kV surge immunity (IEC 61000-4-5) without additional series impedance. |
Use Scenario: Adding secondary-level ESD protection on USB 2.0 D+/D− lines in smart home hubs where internal SoC ESD diodes are insufficient. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical) bidirectional clamp placed after common-mode choke to avoid signal distortion. Use Value: Limits transient voltage to <73 V during 8 kV air discharge, preventing bit errors and PHY lockup without degrading 480 Mbps signaling. |
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/I | Same electrical specs, but RoHS-compliant commercial grade (not AEC-Q101 qualified); uses standard tin plating instead of whisker-tested matte tin. | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select SMBJ45CAHE3/I for cost-sensitive non-automotive applications requiring identical clamping performance. |
| SMAJ45CAHM3 | Lower peak pulse power (400 W vs. 600 W); same VWM/VBR/VC, but in smaller SMA (DO-214AC) package with higher RθJA (140 °C/W). | Reduced surge handling margin; limited to lower-energy transients or space-constrained layouts where SMB footprint is unavailable. | Choose SMAJ45CAHM3 only when board area is critical and surge threat level is below IEC 61000-4-5 Level 2. |
Compared with SMBJ45CAHE3/I, the SMBJ45CAHM3/I adds AEC-Q101 qualification and enhanced whisker resistance, making it suitable for automotive use; versus SMAJ45CAHM3, it delivers 50 % higher surge power handling and better thermal performance in the larger SMB package.
Availability
SMBJ45CAHM3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom line protection, and consumer USB port ESD protection requiring stable component supply and halogen-free compliance.
Supply support for SMBJ45CAHM3/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 infrastructure where robustness and qualification compliance are mandatory.
FAQ
What is the clamping voltage of SMBJ45CAHM3/I under a 10/1000 µs surge?
The SMBJ45CAHM3/I has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current (IPPM) under the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and reflects worst-case voltage seen by protected circuitry during surge events - critical for verifying margin against downstream IC absolute maximum ratings.
Is SMBJ45CAHM3/I qualified for automotive applications?
Yes, SMBJ45CAHM3/I carries the HM3 suffix, indicating halogen-free, RoHS-compliant construction and full AEC-Q101 qualification. It undergoes stress testing including temperature cycling, highly accelerated life testing (HALT), and ESD verification per automotive standards - making it suitable for body electronics, infotainment, and ADAS subsystems.
What is the standoff voltage rating for SMBJ45CAHM3/I?
The SMBJ45CAHM3/I has a reverse standoff voltage (VWM) of 45 V, meaning it remains in high-impedance state up to this DC or RMS voltage level. This allows integration into 36 V nominal systems (e.g., 12 V/24 V automotive or industrial rails) with sufficient margin to avoid false triggering during normal operation or ripple.
Does SMBJ45CAHM3/I have polarity markings on the package?
No, SMBJ45CAHM3/I is a bidirectional TVS diode and carries no polarity marking on its SMB (DO-214AA) package body. Both terminals are functionally identical - the device clamps symmetrically for positive and negative transients, eliminating orientation concerns during automated placement.
What is the thermal resistance of SMBJ45CAHM3/I in standard mounting conditions?
The SMBJ45CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes still air convection and is essential for calculating junction temperature rise during repetitive surge events.
SMBJ45CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMBJ45CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAHM3/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 SMBJ45CAHM3/I reliable?
The price and inventory of SMBJ45CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ45CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAHM3/I?
SMBJ45CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAHM3/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 SMBJ45CAHM3/I?
For technical support, including SMBJ45CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAHM3/I requirements.
6.How does Aetrix verify that SMBJ45CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAHM3/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 SMBJ45CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ45CAHM3/I?
All SMBJ45CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAHM3/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 SMBJ45CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ45CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CAHM3/I Tags
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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