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Vishay General Semiconductor - Diodes Division SMBJ45CAHM3_B/I
- Part No.:
- SMBJ45CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CAHM3_B/I.pdf
- Description:
- 600W,45V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,275
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Product details
Overview
SMBJ45CAHM3_B/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 power and signal lines. It features a 45 V stand-off voltage (VWM), 72.7 V maximum clamping voltage 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 power supplies and telecom equipment.
For engineers reviewing the SMBJ45CAHM3_B/I datasheet, SMBJ45CAHM3_B/I pinout, SMBJ45CAHM3_B/I application, or SMBJ45CAHM3_B/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, halogen-free RoHS compliance, and thermal resistance (RθJA = 100 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both polarities, enabling robust surge suppression without polarity sensitivity. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance, while the M3 suffix confirms halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance.
The SMBJ45CAHM3_B/I is rated for repetitive 10/1000 µs surges at 0.01% duty cycle and supports operating junction temperatures from –55 °C to +150 °C. It meets UL 497B recognition (QVGQ2) and is qualified to AEC-Q101 for automotive-grade reliability when ordered with HM3 suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse working voltage before clamping begins |
| VBR min/max | 50.0 V / 55.3 V at 1 mA - guaranteed breakdown range defining turn-on threshold |
| VC @ IPPM | 72.7 V at 8.3 A - clamped voltage during 10/1000 µs surge, limiting downstream stress |
| PPPM | 600 W - peak transient energy absorption capacity under standardized waveform |
| RθJA | 100 °C/W - thermal resistance from junction to ambient, requiring minimum 5.0 mm × 5.0 mm copper pads per terminal |
| TJ max | +150 °C - maximum allowable junction temperature for sustained operation |
| MSL Level | Level 1 (J-STD-020) - no floor life limitation; safe for reflow up to 260 °C peak |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H), matte tin-plated leads solderable per J-STD-002 and JESD22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One end of symmetrical avalanche junction; conducts during negative transients |
| Cathode | Transient current entry (positive polarity) | Other end of symmetrical junction; conducts during positive transients; unmarked on bidirectional units |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) on properly laid out PCBs |
| AEC-Q101 qualified (HM3) | Validated for automotive powertrain and body electronics where reliability under thermal cycling is critical |
| Halogen-free & RoHS | Complies with environmental regulations and eliminates corrosive halogen emissions during board rework or failure |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to protected ICs compared to higher-ratio TVS devices |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of gate drivers and microcontroller I/O against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Voltage clamping element placed across DC bus or control signal path to limit transient excursions. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic inputs by holding transients below 73 V during 8.3 A surges. | Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Bidirectional transient shunt protecting communication transceivers and analog front-ends. Use Value: Maintains signal integrity during ISO 7637-2 Pulse 5a (75 V/300 ms) events due to its 150 °C TJ rating and AEC-Q101 validation. |
| Telecom Power Interfaces | Consumer Appliance Control Boards |
Use Scenario: Input-stage protection of AC-DC adapters and PoE injectors against lightning-induced surges on primary-side DC rails. IC Role / Device Role / Timing Role: Primary-level TVS placed after bridge rectifier to clamp differential-mode transients. Use Value: Absorbs 600 W pulses without degradation, enabling compact designs that meet UL 62368-1 surge immunity requirements. | Use Scenario: ESD and surge hardening of touch panel interfaces and display backlight drivers in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Secondary-side clamping device on 12 V/24 V internal distribution rails. Use Value: Halogen-free construction avoids corrosion risks in humid environments; MSL Level 1 enables direct SMT assembly without baking. |
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_B/I | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification | Preferred for commercial-grade systems where halogen content is unrestricted | Select when cost optimization is prioritized over halogen-free compliance |
| SMAJ45CAHM3 | Lower 400 W PPPM rating; SMA package (smaller footprint, higher RθJA = 140 °C/W) | Suitable only for lower-energy transients or space-constrained layouts with active cooling | Choose only if board area is critical and surge threat level is ≤ IEC 61000-4-5 Level 3 |
Compared with SMBJ45CAHM3_B/I, the HE3 variant trades halogen-free material for slightly lower cost without sacrificing AEC-Q101 or electrical performance, while the SMAJ45CAHM3 reduces surge capacity and thermal performance - making SMBJ45CAHM3_B/I optimal for high-reliability 600 W surge environments requiring halogen-free compliance.
Availability
SMBJ45CAHM3_B/I is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power interfaces requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ45CAHM3_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, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was developed for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What does the "CA" suffix indicate in SMBJ45CAHM3_B/I?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ45CAHM3_B/I provides symmetrical clamping for both positive and negative voltage transients. Unlike unidirectional variants (e.g., SMBJ45A), it has no cathode marking and functions identically in either polarity - essential for protecting AC-coupled lines or floating references where polarity cannot be assumed.
Is SMBJ45CAHM3_B/I qualified for automotive use?
Yes, SMBJ45CAHM3_B/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix indicating halogen-free, RoHS-compliant construction with automotive-grade reliability testing. It is approved for use in body electronics, infotainment power rails, and sensor interfaces where thermal cycling, humidity, and long-term stability are critical.
What is the maximum clamping voltage of SMBJ45CAHM3_B/I under surge conditions?
The maximum clamping voltage (VC) of SMBJ45CAHM3_B/I is 72.7 V at 8.3 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
How does the SMB (DO-214AA) package of SMBJ45CAHM3_B/I compare to SMA in thermal performance?
SMBJ45CAHM3_B/I in SMB package offers RθJA = 100 °C/W versus ~140 °C/W for SMA-packaged equivalents like SMAJ45CAHM3. The larger SMB footprint allows better heat spreading across 5.0 mm × 5.0 mm copper pads, enabling higher sustained power dissipation and improved reliability in thermally demanding applications without forced cooling.
Does SMBJ45CAHM3_B/I require special handling during PCB assembly?
No special handling is required: SMBJ45CAHM3_B/I is rated MSL Level 1 per J-STD-020 and supports lead-free reflow up to 260 °C peak temperature. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102, and the halogen-free molding compound eliminates post-soldering corrosion risks - enabling standard SMT processes without baking or dry pack requirements.
SMBJ45CAHM3_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:
- -
- 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/I FAQ
1.How can I place an order for SMBJ45CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CAHM3_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 SMBJ45CAHM3_B/I reliable?
The price and inventory of SMBJ45CAHM3_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 SMBJ45CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ45CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CAHM3_B/I?
SMBJ45CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CAHM3_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 SMBJ45CAHM3_B/I?
For technical support, including SMBJ45CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ45CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ45CAHM3_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 SMBJ45CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ45CAHM3_B/I?
All SMBJ45CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CAHM3_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 SMBJ45CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ45CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CAHM3_B/I Tags
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