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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

Vishay General Semiconductor - Diodes Division SMBG45A-M3/52

Name: SMBG45A-M3/52
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMBG45A-M3/52
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBG45A-M3/52

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-215AA, SMB Gull Wing

Datasheet:: SMBG45A-M3/52.pdf

Description:: TVS DIODE 45VWM 72.7VC DO215AA

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Product details

Overview

SMBG45A-M3/52 from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 45 V stand-off voltage (V_WM), 50.0–55.3 V breakdown voltage (V_BR) at 1 mA, 72.7 V maximum clamping voltage (V_C) 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 automotive ECUs and industrial sensor interfaces.

For engineers reviewing the SMBG45A-M3/52 datasheet, SMBG45A-M3/52 pinout, SMBG45A-M3/52 application, or SMBG45A-M3/52 equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, halogen-free RoHS compliance (M3 suffix), 150 °C max junction temperature, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This TVS diode operates as a clamping device that remains high-impedance below 45 V and rapidly transitions to low-impedance conduction above its 50.0–55.3 V breakdown threshold. Its glass-passivated junction ensures stable leakage (<1.0 μA at V_WM) and fast response time (<1 ns), enabling suppression of ESD, lightning-induced surges, and inductive switching transients.

The SMBG45A-M3/52 delivers 600 W peak pulse power handling with 0.01% duty cycle, supported by thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead). Its M3 suffix confirms halogen-free, RoHS-compliant construction and JESD201 Class 2 whisker resistance - critical for automotive and industrial long-life deployments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	45 V - Maximum continuous reverse operating voltage before clamping begins
V_BR (min/max)	50.0 V / 55.3 V at 1 mA - Ensures reliable turn-on within defined tolerance band under standardized test conditions
V_C @ I_PPM	72.7 V at 8.3 A - Clamped voltage during 10/1000 μs surge, limiting stress on downstream ICs
P_PPM	600 W - Peak transient power dissipation capability without failure under repetitive 0.01% duty cycle
I_FSM	100 A - Single half-sine surge current rating (8.3 ms), supporting high-energy inductive load switching events
T_J max	+150 °C - Enables operation in under-hood automotive environments and enclosed industrial enclosures
Leakage @ V_WM	≤1.0 μA - Minimizes standby power loss and avoids false triggering in low-current sensor circuits

Pinout & Package

Package: SMBG (DO-215AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode indicated by molded band; polarity-critical for unidirectional operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Low-side reference terminal	Connected to circuit ground or lowest potential node; defines current path during clamping
Cathode	Protected line input terminal	Connected to line being protected (e.g., 45 V supply rail); band-marked end for orientation verification

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards
Halogen-free & RoHS compliant (M3)	Meets environmental compliance requirements for EU and global automotive OEMs without compromising thermal or electrical performance
600 W peak pulse power (10/1000 μs)	Handles high-energy transients common in 12 V/24 V vehicle systems and industrial motor drives
Low incremental surge resistance	Minimizes V_C overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces
MSL Level 1 (260 °C peak reflow)	Compatible with standard lead-free reflow profiles without preconditioning or special handling

Applications

Automotive Power Rail Protection	Industrial Sensor Signal Line Protection
Use Scenario: Protecting 45 V battery-supplied control modules against load dump and alternator ripple in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and chassis ground to shunt surge energy away from MCU and CAN transceivers. Use Value: Limits transient voltage to ≤72.7 V during 8.3 A surges, preserving integrity of 48 V tolerant power management ICs and meeting ISO 7637-2 Pulse 5a requirements.	Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events in factory automation sensors. IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line to ground, activated only during overvoltage events exceeding 45 V. Use Value: Sub-μA leakage ensures no impact on loop accuracy; <1 ns response prevents latch-up in precision op-amps and ADC front-ends.
Telecom DC Power Interface	Consumer Device USB Power Input
Use Scenario: Secondary overvoltage protection on -48 V telecom rectifier outputs feeding base station backplanes. IC Role / Device Role / Timing Role: Unidirectional TVS mounted at board edge to clamp induced surges from nearby lightning strikes or power cross-talk. Use Value: 600 W rating sustains repeated 10/1000 μs transients; 150 °C T_J max supports operation in sealed, fanless telecom cabinets.	Use Scenario: Input-stage surge suppression on USB-C PD power delivery inputs in portable medical monitors. IC Role / Device Role / Timing Role: Clamping device between VBUS and ground, sized to absorb IEC 61000-4-5 Level 3 (1 kV/42 Ω) surges without degradation. Use Value: 72.7 V clamping voltage provides safe margin below typical 20 V PD3.1 overvoltage thresholds, preventing damage to buck controller ICs.

Automotive Power Rail Protection

Industrial Sensor Signal Line Protection

Use Scenario: Protecting 45 V battery-supplied control modules against load dump and alternator ripple in passenger vehicles.

IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and chassis ground to shunt surge energy away from MCU and CAN transceivers.

Use Value: Limits transient voltage to ≤72.7 V during 8.3 A surges, preserving integrity of 48 V tolerant power management ICs and meeting ISO 7637-2 Pulse 5a requirements.

Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loop) from ESD and cable discharge events in factory automation sensors.

IC Role / Device Role / Timing Role: Standoff-connected TVS on signal line to ground, activated only during overvoltage events exceeding 45 V.

Use Value: Sub-μA leakage ensures no impact on loop accuracy; <1 ns response prevents latch-up in precision op-amps and ADC front-ends.

Telecom DC Power Interface

Consumer Device USB Power Input

Use Scenario: Secondary overvoltage protection on -48 V telecom rectifier outputs feeding base station backplanes.

IC Role / Device Role / Timing Role: Unidirectional TVS mounted at board edge to clamp induced surges from nearby lightning strikes or power cross-talk.

Use Value: 600 W rating sustains repeated 10/1000 μs transients; 150 °C T_J max supports operation in sealed, fanless telecom cabinets.

Use Scenario: Input-stage surge suppression on USB-C PD power delivery inputs in portable medical monitors.

IC Role / Device Role / Timing Role: Clamping device between VBUS and ground, sized to absorb IEC 61000-4-5 Level 3 (1 kV/42 Ω) surges without degradation.

Use Value: 72.7 V clamping voltage provides safe margin below typical 20 V PD3.1 overvoltage thresholds, preventing damage to buck controller ICs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient voltage suppression applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBG45A-E3/52	Same electrical specs; RoHS-compliant but not halogen-free (E3 vs. M3)	Acceptable for industrial use where halogen-free requirement is not mandated	Select when cost sensitivity outweighs halogen-free compliance; identical footprint and assembly process
SMBG45AHM3/52	Identical specs plus AEC-Q101 qualification (HM3 suffix denotes AEC-Q101 + halogen-free)	Required for automotive safety-critical subsystems (e.g., ADAS power domains)	Choose for automotive designs needing full AEC-Q101 validation; same thermal and electrical behavior as SMBG45A-M3/52

Compared with SMBG45A-M3/52, SMBG45A-E3/52 lacks halogen-free certification but offers identical surge performance, while SMBG45AHM3/52 adds formal AEC-Q101 qualification - making it suitable for automotive functional safety applications where SMBG45A-M3/52 meets industrial but not automotive qualification requirements.

Availability

SMBG45A-M3/52 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and telecom DC power interface designs requiring stable component supply, halogen-free compliance, and AEC-Q101-aligned reliability.

Supply support for SMBG45A-M3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.

The SMBG series was engineered for high-power transient suppression in space-constrained SMT layouts, targeting automotive, industrial, and telecom applications demanding robustness against ISO 7637, IEC 61000-4-5, and ESD IEC 61000-4-2 threats.

FAQ

What is the clamping voltage of SMBG45A-M3/52 and how is it measured?

The SMBG45A-M3/52 has a maximum clamping voltage (V_C) of 72.7 V, measured at 8.3 A peak pulse current using a 10/1000 μs waveform per IEC 61000-4-5. This value represents the upper limit of voltage seen by protected circuitry during a standardized surge event, ensuring downstream components remain within safe operating limits. The SMBG45A-M3/52 achieves this clamping performance consistently across its rated temperature range.

Is SMBG45A-M3/52 suitable for automotive applications?

SMBG45A-M3/52 is halogen-free and RoHS compliant but not AEC-Q101 qualified. For automotive use, Vishay specifies the SMBG45AHM3/52 variant - which shares identical electrical characteristics and package but adds formal AEC-Q101 qualification. Therefore, SMBG45A-M3/52 is appropriate for non-safety-critical automotive subsystems where halogen-free compliance is required but AEC-Q101 is not mandated.

What does the "M3" suffix mean in SMBG45A-M3/52?

The "M3" suffix in SMBG45A-M3/52 indicates halogen-free, RoHS-compliant construction meeting JESD201 Class 2 whisker resistance requirements. It also signifies industrial-grade qualification and compatibility with standard lead-free reflow profiles (MSL Level 1, 260 °C peak). This distinguishes SMBG45A-M3/52 from E3 (RoHS only) and HM3 (AEC-Q101 + halogen-free) variants.

How does SMBG45A-M3/52 compare to SMBG45A-E3/52 in terms of thermal performance?

SMBG45A-M3/52 and SMBG45A-E3/52 share identical thermal characteristics: both exhibit 100 °C/W junction-to-ambient and 20 °C/W junction-to-lead thermal resistance. The M3 and E3 suffixes denote material composition differences (halogen-free vs. standard RoHS), not thermal design changes. PCB layout and copper pad area (0.2" × 0.2") must be maintained identically for either variant to achieve rated power dissipation.

Can SMBG45A-M3/52 be used in bidirectional configurations?

No - SMBG45A-M3/52 is a unidirectional TVS diode, identifiable by its cathode band marking. Bidirectional operation requires the CA-suffixed variant (e.g., SMBG45CA). Using SMBG45A-M3/52 in reverse-biased AC applications would result in forward conduction and potential failure. Always verify polarity during placement; the SMBG45A-M3/52 functions only when cathode is at higher potential than anode during surge events.

SMBG45A-M3/52 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-215AA, SMB Gull Wing

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

Product Status:: Active

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

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:: -65°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMBG)

SMBG45A-M3/52 FAQ

1.How can I place an order for SMBG45A-M3/52 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBG45A-M3/52 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 SMBG45A-M3/52 reliable?

The price and inventory of SMBG45A-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG45A-M3/52 is usually 5 days.

3.What payment methods are accepted for SMBG45A-M3/52?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG45A-M3/52 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBG45A-M3/52?

SMBG45A-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBG45A-M3/52 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 SMBG45A-M3/52?

For technical support, including SMBG45A-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG45A-M3/52 requirements.

6.How does Aetrix verify that SMBG45A-M3/52 is sourced from the original manufacturer or authorized distributors?

All SMBG45A-M3/52 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 SMBG45A-M3/52 meets industry standards.

7.What is the process for return or replacement of SMBG45A-M3/52?

All SMBG45A-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG45A-M3/52, 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 SMBG45A-M3/52 part is unused and in its original packaging.

Return procedure for SMBG45A-M3/52:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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