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Vishay General Semiconductor - Diodes Division SMBJ45CA-M3/5B
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- Part No.:
- SMBJ45CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CA-M3/5B.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,113
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Product details
Overview
SMBJ45CA-M3/5B 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 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 - used to protect MOSFETs, ICs, and sensor interfaces in industrial motor drives and telecom line cards.
For engineers reviewing the SMBJ45CA-M3/5B datasheet, SMBJ45CA-M3/5B pinout, SMBJ45CA-M3/5B application, or SMBJ45CA-M3/5B equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), JEDEC-compliant SMB package dimensions, and AEC-Q101-qualified alternatives for automotive-grade surge protection design validation.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (50.0 V / 55.3 V), ID ≤ 1.0 μA at VWM, and VC = 72.7 V measured at IPPM = 8.3 A under 10/1000 μs waveform. Its glass-passivated junction ensures stable avalanche characteristics and low incremental surge resistance.
Designed for surface-mount automated assembly, it meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), has matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, and supports repetitive surge duty cycle of 0.01 % without degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/max) | 50.0 V / 55.3 V at IT = 1 mA - guaranteed avalanche breakdown range defining turn-on threshold |
| VC @ IPPM | 72.7 V at 8.3 A - clamped voltage during 10/1000 μs transient, limiting stress on downstream circuitry |
| PPPM | 600 W - peak pulse power handling capability under standardized surge waveform |
| ID @ VWM | ≤ 1.0 μA - ultra-low leakage ensuring minimal standby power loss and signal integrity |
| TJ max. | +150 °C - maximum junction temperature enabling operation in high-ambient industrial environments |
| RθJA | 100 °C/W - thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); cathode band absent (bidirectional type).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Accepts reverse surge current during negative excursions; symmetrical with Cathode |
| Cathode | Transient current entry (positive polarity) | Accepts reverse surge current during positive excursions; symmetrical with Anode |
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 | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 24 V industrial buses |
| 72.7 V clamping voltage | Limits voltage seen by 48 V-rated logic or gate drivers during 8.3 A transient events |
| MSL Level 1 rating | Supports lead-free reflow up to 260 °C without popcorn or delamination risk |
| Halogen-free & RoHS | Complies with IPC-1752A material declaration requirements for green manufacturing |
Applications
| Industrial Motor Drives | Telecom Line Cards |
|---|---|
Use Scenario: Protection of gate driver inputs against inductive kickback from IGBTs in servo inverters. IC Role / Device Role / Timing Role: Bidirectional TVS clamps ±100 V transients induced by 100 A switching currents. Use Value: Prevents latch-up or oxide rupture in isolated gate drivers rated for 60 V absolute maximum. |
Use Scenario: Surge suppression on RS-485 data lines exposed to lightning-induced surges in outdoor base stations. IC Role / Device Role / Timing Role: Fast-response clamping element placed before receiver input pins. Use Value: Limits differential-mode surge to <73 V, preserving signal integrity and avoiding receiver overvoltage shutdown. |
| Automotive Body Control Modules | Consumer Power Adapters |
Use Scenario: CAN bus line protection in 12 V vehicle subsystems subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Secondary-level TVS supplementing primary protection on LIN/CAN physical layer. Use Value: Clamps fast-rising transients (<1 ns rise time) while maintaining <1 pF junction capacitance to avoid signal distortion. |
Use Scenario: Input-stage surge guard for universal-input AC-DC adapters with 24 V DC output rails. IC Role / Device Role / Timing Role: Standoff-rated suppressor placed across bulk capacitor terminals. Use Value: Absorbs 600 W energy from 1.2/50 μs surges without thermal runaway, extending capacitor lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45CA-E3/5B | Same electrical specs; RoHS-compliant but not halogen-free; commercial grade only | Lacks halogen-free certification required for some EU industrial equipment | Select when halogen-free compliance is not mandated and cost optimization is prioritized |
| SMBJ45CAHM3_B/I | AEC-Q101 qualified; same SMB package; halogen-free and RoHS-compliant | Approved for automotive underhood applications with extended temperature cycling | Choose for automotive BOMs requiring qualification evidence and traceable lot control |
Compared with SMBJ45CA-M3/5B, the E3/5B variant offers identical clamping performance at lower cost but lacks halogen-free status, while the HM3_B/I version adds AEC-Q101 qualification for automotive deployment - neither is pin-compatible drop-in replacements due to differing qualification scope and material declarations.
Availability
SMBJ45CA-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom line cards, automotive body control modules, and consumer power adapters requiring stable component supply with halogen-free compliance and commercial-grade reliability.
Supply support for SMBJ45CA-M3/5B 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 ruggedness, precision, and manufacturability.
The SMBJ series targets board-level transient protection in space-constrained applications, delivering high-power surge immunity in low-profile surface-mount packages for industrial, telecom, and automotive systems.
FAQ
What is the clamping voltage of SMBJ45CA-M3/5B at its rated peak pulse current?
The SMBJ45CA-M3/5B has a maximum clamping voltage (VC) of 72.7 V at 8.3 A peak pulse current (IPPM), measured using the standardized 10/1000 μs double-exponential waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is confirmed in Vishay's datasheet revision 09-Jan-2024, Document Number 88392. The SMBJ45CA-M3/5B maintains this clamping performance bidirectionally.
Is SMBJ45CA-M3/5B suitable for automotive applications?
SMBJ45CA-M3/5B is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For non-safety-critical automotive modules such as infotainment or lighting control where qualification is not mandated, it may be used - however, Vishay's SMBJ45CAHM3_B/I variant is the AEC-Q101-qualified alternative. The SMBJ45CA-M3/5B itself does not carry automotive qualification documentation or test reports.
What is the thermal resistance of SMBJ45CA-M3/5B, and how does it affect PCB layout?
The SMBJ45CA-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. To maintain safe operation below +150 °C junction temperature, PCB layout must provide adequate copper area and avoid excessive power dissipation in sustained surge conditions. Derating curves in Figure 2 of the datasheet apply directly to the SMBJ45CA-M3/5B.
Does SMBJ45CA-M3/5B have polarity marking, and how is it identified on the device?
No - SMBJ45CA-M3/5B is a bidirectional TVS diode and carries no cathode band or polarity marking. Unlike unidirectional variants (e.g., SMBJ45A), the CA suffix indicates symmetrical conduction in both directions, and the device functions identically regardless of orientation on the PCB. This simplifies placement and eliminates orientation errors during automated assembly of the SMBJ45CA-M3/5B.
What is the maximum reverse leakage current for SMBJ45CA-M3/5B at its stand-off voltage?
The SMBJ45CA-M3/5B exhibits a maximum reverse leakage current (ID) of 1.0 μA at its 45 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage ensures minimal impact on high-impedance sensor bias networks or battery-powered circuits. The specification is validated per ANSI/IEEE C62.35 and applies equally in both directions due to the device's bidirectional construction.
SMBJ45CA-M3/5B 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ45CA-M3/5B FAQ
1.How can I place an order for SMBJ45CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CA-M3/5B 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 SMBJ45CA-M3/5B reliable?
The price and inventory of SMBJ45CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ45CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CA-M3/5B?
SMBJ45CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CA-M3/5B 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 SMBJ45CA-M3/5B?
For technical support, including SMBJ45CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ45CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ45CA-M3/5B 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 SMBJ45CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ45CA-M3/5B?
All SMBJ45CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CA-M3/5B, 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 SMBJ45CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ45CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ45CA-M3/5B Tags
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