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

Vishay General Semiconductor - Diodes Division SMBG43A-E3/5B

Name: SMBG43A-E3/5B
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMBG43A-E3/5B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBG43A-E3/5B

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-215AA, SMB Gull Wing

Datasheet:: SMBG43A-E3/5B.pdf

Description:: TVS DIODE 43VWM 69.4VC DO215AA

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Product details

Overview

SMBG43A-E3/5B from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMBG (DO-215AA) package, designed for clamping transient overvoltages on power and signal lines. It features a 43 V stand-off voltage (V_WM), 47.8–52.8 V breakdown voltage (V_BR) at 1 mA, 69.4 V maximum clamping voltage (V_C) at 8.6 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 automotive and industrial power supplies.

For engineers reviewing the SMBG43A-E3/5B datasheet, SMBG43A-E3/5B pinout, SMBG43A-E3/5B application, or SMBG43A-E3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.

Technical Context

This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while the low R_surge enables effective energy diversion during ESD or lightning-induced transients.

The SMBG43A-E3/5B is rated for 100 A non-repetitive forward surge current (I_FSM, 8.3 ms half-sine), exhibits 1.0 µA max reverse leakage at V_WM, and maintains thermal stability with R_θJA = 100 °C/W and R_θJL = 20 °C/W - enabling reliable operation in high-temperature automotive under-hood environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	43 V - maximum continuous reverse operating voltage before clamping begins
V_BR (min/max)	47.8 V / 52.8 V at I_T = 1 mA - defines precise avalanche onset window for predictable protection threshold
V_C @ I_PPM	69.4 V at 8.6 A - clamping voltage during 10/1000 µs transient, limiting stress on downstream components
P_PPM	600 W - peak pulse power handling capability under standardized surge waveform
I_FSM	100 A - single half-sine surge current rating (8.3 ms), critical for load-dump immunity
T_J max	+150 °C - maximum junction temperature, supporting AEC-Q101 automotive qualification
Leakage @ V_WM	1.0 µA - ultra-low reverse leakage preserves system standby power integrity

Pinout & Package

Package: SMBG (DO-215AA), surface-mount gull-wing leaded case with matte tin-plated terminals; meets UL 94 V-0, MSL Level 1 (260 °C reflow peak), and JESD201 Class 2 whisker resistance.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (banded end)	Transient current sink node	Connected to protected line; conducts avalanche current to ground during overvoltage events
Anode	Reference/ground return path	Typically tied to system ground plane; completes clamping loop with minimal inductance

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including engine control units and ADAS sensor interfaces
Glass passivated junction	Ensures long-term reliability and stable V_BR drift under thermal cycling and humidity stress
600 W peak pulse power (10/1000 µs)	Provides robust immunity against ISO 7637-2 Pulse 1, 2a, 3a/b, and IEC 61000-4-5 surges
Low profile SMBG package	Enables high-density PCB layouts and compatibility with automated pick-and-place equipment
RoHS-compliant, halogen-free option available	E3 suffix indicates industrial-grade RoHS compliance; HE3/HM3 variants support AEC-Q101 + halogen-free requirements

Applications

Automotive Power Supply Protection	Industrial Sensor Interface Protection
Use Scenario: Protecting 12 V/24 V power rails in engine control modules from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage. Use Value: Limits voltage excursion to ≤69.4 V during 100 A load dump events, preventing damage to upstream regulators and microcontrollers.	Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground near sensor connector. Use Value: Clamps ESD strikes up to ±15 kV (IEC 61000-4-2) without distorting mV-level sensor signals due to sub-1 ns response.
Telecom Line Card Surge Protection	Consumer Power Adapter Input Stage
Use Scenario: Safeguarding PoE-powered Ethernet PHY interfaces against induced lightning surges. IC Role / Device Role / Timing Role: TVS array component on primary-side DC input of midspan injector or endpoint switch. Use Value: Absorbs 600 W surge energy per line while maintaining <1.0 µA leakage to avoid phantom power drain.	Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home devices. IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V/9 V/12 V output rail to prevent latch-up during hot-plug events. Use Value: Guarantees 43 V hold-off with 69.4 V clamping, ensuring USB-C PD negotiation remains intact during transient faults.

Automotive Power Supply Protection

Industrial Sensor Interface Protection

Use Scenario: Protecting 12 V/24 V power rails in engine control modules from load dump and alternator transients.

IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and DC-DC converter input stage.

Use Value: Limits voltage excursion to ≤69.4 V during 100 A load dump events, preventing damage to upstream regulators and microcontrollers.

Use Scenario: Shielding analog output lines of pressure/temperature sensors in factory automation systems.

IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and ground near sensor connector.

Use Value: Clamps ESD strikes up to ±15 kV (IEC 61000-4-2) without distorting mV-level sensor signals due to sub-1 ns response.

Telecom Line Card Surge Protection

Consumer Power Adapter Input Stage

Use Scenario: Safeguarding PoE-powered Ethernet PHY interfaces against induced lightning surges.

IC Role / Device Role / Timing Role: TVS array component on primary-side DC input of midspan injector or endpoint switch.

Use Value: Absorbs 600 W surge energy per line while maintaining <1.0 µA leakage to avoid phantom power drain.

Use Scenario: Secondary-side overvoltage suppression in AC/DC adapters for smart home devices.

IC Role / Device Role / Timing Role: Standoff-rated TVS on 5 V/9 V/12 V output rail to prevent latch-up during hot-plug events.

Use Value: Guarantees 43 V hold-off with 69.4 V clamping, ensuring USB-C PD negotiation remains intact during transient faults.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBG43A-M3/5B	Halogen-free construction; identical electrical specs and AEC-Q101 qualification	Required where halogen-free compliance is mandated by OEM environmental policy	Select SMBG43A-M3/5B when RoHS + halogen-free certification is contractually required
SMBG43AHM3/5B	Same halogen-free and AEC-Q101 specs as SMBG43A-M3/5B, but with enhanced process controls for extended lifetime	Targeted at safety-critical automotive subsystems requiring zero-defect traceability	Choose SMBG43AHM3/5B for ASIL-B functional safety domains with full PPAP documentation

Compared with SMBG43A-E3/5B, the M3 variant adds halogen-free compliance without altering clamping behavior, while the HM3 version extends reliability validation for mission-critical automotive use - all share identical SMBG package, pinout, and 43 V/69.4 V protection profile.

Availability

SMBG43A-E3/5B is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface design, and telecom line card development requiring stable component supply and AEC-Q101 assurance.

Supply support for SMBG43A-E3/5B 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 reliability, precision, and automotive-grade qualification.

The SMBG TransZORB® series was engineered specifically for high-energy transient suppression in space-constrained, thermally demanding environments - delivering consistent clamping performance across automotive, industrial, and telecom applications.

FAQ

What is the breakdown voltage range of SMBG43A-E3/5B?

The SMBG43A-E3/5B has a guaranteed breakdown voltage (V_BR) range of 47.8 V to 52.8 V at test current I_T = 1 mA, measured per ANSI/IEEE C62.35 standards. This tight tolerance ensures predictable clamping onset in 43 V nominal systems and supports robust margining against supply rail variations.

Is SMBG43A-E3/5B suitable for automotive applications?

Yes, SMBG43A-E3/5B is AEC-Q101 qualified and rated for operation from –55 °C to +150 °C junction temperature. Its glass-passivated junction, 100 A I_FSM, and 600 W P_PPM make it appropriate for engine control units, body electronics, and ADAS power rails where load dump and ISO 7637-2 immunity are required.

What does the "E3/5B" suffix mean in SMBG43A-E3/5B?

The "E3" denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads; "5B" specifies packaging in 13-inch diameter tape-and-reel format containing 3200 units. This differs from "52" (7-inch reel, 750 units) and "HE3" (AEC-Q101 + RoHS).

How does SMBG43A-E3/5B compare to bidirectional TVS diodes like SMBG43CA?

SMBG43A-E3/5B is unidirectional and intended for DC line protection with cathode-to-rail orientation; SMBG43CA is bidirectional and suited for AC or differential signal lines. They share identical V_WM (43 V), V_BR, and V_C, but differ in polarity marking and leakage symmetry - SMBG43A-E3/5B shows 1.0 µA leakage only in reverse bias.

What is the thermal resistance of SMBG43A-E3/5B?

SMBG43A-E3/5B has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W and junction-to-lead resistance (R_θJL) of 20 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. These values inform derating curves for sustained power dissipation in high-temperature enclosures.

SMBG43A-E3/5B 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):: 43V

Voltage - Breakdown (Min):: 47.8V

Voltage - Clamping (Max) @ Ipp:: 69.4V

Current - Peak Pulse (10/1000µs):: 8.6A

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 (SMBG)

SMBG43A-E3/5B FAQ

1.How can I place an order for SMBG43A-E3/5B through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBG43A-E3/5B 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 SMBG43A-E3/5B reliable?

The price and inventory of SMBG43A-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG43A-E3/5B is usually 5 days.

3.What payment methods are accepted for SMBG43A-E3/5B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG43A-E3/5B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBG43A-E3/5B?

SMBG43A-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBG43A-E3/5B 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 SMBG43A-E3/5B?

For technical support, including SMBG43A-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG43A-E3/5B requirements.

6.How does Aetrix verify that SMBG43A-E3/5B is sourced from the original manufacturer or authorized distributors?

All SMBG43A-E3/5B 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 SMBG43A-E3/5B meets industry standards.

7.What is the process for return or replacement of SMBG43A-E3/5B?

All SMBG43A-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG43A-E3/5B, 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 SMBG43A-E3/5B part is unused and in its original packaging.

Return procedure for SMBG43A-E3/5B:

1.Submit a request within 90 days.

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

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