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

Vishay General Semiconductor - Diodes Division SMBG18A-E3/52

Name: SMBG18A-E3/52
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMBG18A-E3/52
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBG18A-E3/52

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-215AA, SMB Gull Wing

Datasheet:: SMBG18A-E3/52.pdf

Description:: TVS DIODE 18VWM 29.2VC DO215AA

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Product details

Overview

SMBG18A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power and signal lines. It features a 18 V stand-off voltage (V_WM), 20.0–22.1 V breakdown voltage (V_BR) at 1.0 mA, 29.2 V maximum clamping voltage (V_C) at 20.5 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive sensor interfaces, industrial I/O modules, and DC power rail protection.

For engineers reviewing the SMBG18A-E3/52 datasheet, SMBG18A-E3/52 pinout, SMBG18A-E3/52 application, or SMBG18A-E3/52 equivalent, this device is evaluated for ESD and surge immunity in AEC-Q101-compliant systems, PCB-level transient suppression on 12 V/24 V rails, and junction temperature derating above 25 °C per Fig. 2.

Technical Context

This unidirectional TVS operates as a voltage-clamped shunt protector: under normal bias it presents <1.0 μA reverse leakage at 18 V, then rapidly avalanches when transients exceed 20.0 V to clamp energy within 1.0 ns response time. Its glass-passivated junction ensures stable V_BR tolerance (±5 %) and low incremental surge resistance.

Mounted on 5.0 mm × 5.0 mm copper pads, it delivers 600 W pulse power with thermal resistance R_θJA = 100 °C/W and R_θJL = 20 °C/W, supporting operation from –55 °C to +150 °C junction temperature - qualified per AEC-Q101 for automotive under-hood and body electronics.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	18 V - Maximum continuous reverse operating voltage before conduction begins; defines safe DC/AC working margin.
V_BR (min/max)	20.0 V / 22.1 V at 1.0 mA - Ensures reliable avalanche initiation across process variation; ±5 % tolerance enables predictable clamping onset.
V_C @ I_PPM	29.2 V at 20.5 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress to sub-30 V level.
P_PPM	600 W - Peak transient power dissipation capability; supports IEC 61000-4-5 Level 4 (4 kV) surge testing on 50 Ω source impedance.
I_FSM	100 A - Non-repetitive 8.3 ms half-sine surge rating; protects against load dump events in 12 V automotive systems.
Junction Temp	–55 °C to +150 °C - Enables deployment in engine control units, battery management, and industrial motor drives without derating below –40 °C ambient.

Pinout & Package

Package: SMBG (DO-215AA) - low-profile surface-mount case with matte tin-plated leads, UL 94 V-0 molding compound, MSL Level 1 (260 °C reflow peak), and cathode band marking for polarity identification.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry terminal under forward bias	Connected to protected line (e.g., 12 V rail); conducts only during positive transients or forward faults.
Cathode	Current exit terminal; marked with band	Connected to ground or lower-potential reference; establishes unidirectional clamping path to earth/sink.

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, humidity bias, and surge endurance - required for ECU, ADAS, and body control modules.
600 W peak pulse power	Withstands 10/1000 μs surges up to 20.5 A while maintaining V_C ≤ 29.2 V - meets ISO 7637-2 Pulse 1/2/5a/b immunity requirements.
Glass-passivated junction	Ensures stable V_BR drift < ±3 % over lifetime and eliminates moisture-induced parameter shift in humid environments.
Low-profile SMBG package	0.235" × 0.130" footprint with 0.030" height - compatible with automated SMT placement and high-density PCB layouts.

Applications

Automotive Sensor Protection	Industrial I/O Interface
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle cabins. IC Role / Device Role / Timing Role: Unidirectional shunt clamping element placed between signal line and chassis ground. Use Value: Limits transient voltage to ≤29.2 V during 100 V/500 ms load dump events, preserving signal integrity and preventing transceiver latch-up.	Use Scenario: Safeguarding PLC digital input terminals exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines upstream of optocoupler isolation stages. Use Value: Absorbs 600 W surge energy without degradation, enabling compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) standards.
DC Power Rail Protection	Consumer Device USB Port
Use Scenario: Secondary protection on 12 V/24 V power distribution networks feeding microcontrollers and communication ICs. IC Role / Device Role / Timing Role: Fast-response parallel suppressor placed after primary fuse and upstream of LDO regulators. Use Value: Clamps 10/1000 μs surges to 29.2 V within <1 ns, preventing regulator overvoltage failure and system brownout.	Use Scenario: ESD and lightning-induced surge suppression on VBUS and D+/D– lines of USB 2.0 ports in smart home hubs. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) unidirectional TVS tied between data lines and ground plane. Use Value: Maintains signal integrity up to 480 Mbps while passing IEC 61000-4-2 Level 4 (±15 kV air/±8 kV contact) ESD tests.

Automotive Sensor Protection

Industrial I/O Interface

Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and ESD in vehicle cabins.

IC Role / Device Role / Timing Role: Unidirectional shunt clamping element placed between signal line and chassis ground.

Use Value: Limits transient voltage to ≤29.2 V during 100 V/500 ms load dump events, preserving signal integrity and preventing transceiver latch-up.

Use Scenario: Safeguarding PLC digital input terminals exposed to inductive switching noise from solenoids and contactors.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines upstream of optocoupler isolation stages.

Use Value: Absorbs 600 W surge energy without degradation, enabling compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) standards.

DC Power Rail Protection

Consumer Device USB Port

Use Scenario: Secondary protection on 12 V/24 V power distribution networks feeding microcontrollers and communication ICs.

IC Role / Device Role / Timing Role: Fast-response parallel suppressor placed after primary fuse and upstream of LDO regulators.

Use Value: Clamps 10/1000 μs surges to 29.2 V within <1 ns, preventing regulator overvoltage failure and system brownout.

Use Scenario: ESD and lightning-induced surge suppression on VBUS and D+/D– lines of USB 2.0 ports in smart home hubs.

IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at 0 V) unidirectional TVS tied between data lines and ground plane.

Use Value: Maintains signal integrity up to 480 Mbps while passing IEC 61000-4-2 Level 4 (±15 kV air/±8 kV contact) ESD tests.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBG18CA-E3/52	Bidirectional variant; symmetric V_BR = 20.0–22.1 V; no polarity marking; same V_C = 29.2 V at 20.5 A.	Required where AC-coupled signals or dual-polarity transients (e.g., RS-485, Ethernet PHY) demand symmetrical clamping.	Select SMBG18CA-E3/52 only if bidirectional protection is mandated by signal architecture - not a drop-in replacement for SMBG18A-E3/52.
SMAJ18A-E3/52	Same V_WM/V_BR/V_C, but lower P_PPM = 400 W; SMA package (DO-214AC); R_θJA = 125 °C/W; non-AEC-Q101.	Suitable for cost-sensitive consumer or industrial applications lacking automotive qualification requirements.	Choose SMAJ18A-E3/52 only when AEC-Q101 is unnecessary and 400 W pulse power suffices - different footprint requires PCB redesign.

Compared with SMBG18CA-E3/52 and SMAJ18A-E3/52, SMBG18A-E3/52 uniquely combines AEC-Q101 qualification, 600 W surge capacity, and SMBG package compatibility - making it the preferred choice for automotive power-line protection where unidirectional clamping and high-reliability mounting are mandatory.

Availability

SMBG18A-E3/52 is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and DC power supply designs requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.

Supply support for SMBG18A-E3/52 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.

The SMBG Transient Voltage Suppressor family targets high-energy surge immunity in harsh environments - engineered for automotive, industrial, and telecom infrastructure where AEC-Q101 compliance and 600 W pulse handling are critical design requirements.

FAQ

What is the maximum clamping voltage of SMBG18A-E3/52 under standard test conditions?

The SMBG18A-E3/52 has a maximum clamping voltage (V_C) of 29.2 V when subjected to its rated peak pulse current (I_PPM) of 20.5 A using a 10/1000 μs waveform. This value is measured at T_A = 25 °C with specified PCB pad layout (0.2" × 0.2" copper), and represents the upper voltage limit imposed on protected circuitry during transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.

Is SMBG18A-E3/52 qualified for automotive applications?

Yes, SMBG18A-E3/52 is AEC-Q101 qualified, as confirmed in the Vishay datasheet (Document Number: 88456, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, high-temperature operating life, and surge endurance - validating its suitability for under-hood and body electronics such as engine control units, battery management systems, and ADAS sensor interfaces where reliability under thermal and electrical stress is mandatory.

What is the junction-to-ambient thermal resistance of SMBG18A-E3/52?

The SMBG18A-E3/52 has a typical junction-to-ambient thermal resistance (R_θJA) 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 natural convection cooling and directly impacts allowable power dissipation at elevated ambient temperatures - for example, at T_A = 85 °C, the device's usable pulse duty cycle must be reduced to maintain T_J ≤ 150 °C.

How does the SMBG18A-E3/52 differ from the SMBG18CA-E3/52?

The SMBG18A-E3/52 is unidirectional with cathode band marking and blocks reverse current until V_BR is exceeded, whereas SMBG18CA-E3/52 is bidirectional with identical V_BR in both directions and no polarity marking. Both share identical V_WM (18 V), V_C (29.2 V), and P_PPM (600 W), but SMBG18CA-E3/52 is used for AC-coupled or differential signal lines like RS-485 or CAN FD, while SMBG18A-E3/52 is selected for DC power rails and single-ended signal protection.

What packaging format is supplied for SMBG18A-E3/52?

SMBG18A-E3/52 is supplied in 7" diameter plastic tape and reel packaging with a base quantity of 750 units per reel (ordering code /52). The tape conforms to EIA-481 standards, supports automated pick-and-place assembly, and features RoHS-compliant matte tin-plated leads qualified per J-STD-002 and JESD 22-B102 for solderability - essential for high-yield SMT manufacturing in automotive and industrial production lines.

SMBG18A-E3/52 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):: 18V

Voltage - Breakdown (Min):: 20V

Voltage - Clamping (Max) @ Ipp:: 29.2V

Current - Peak Pulse (10/1000µs):: 20.5A

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)

SMBG18A-E3/52 FAQ

1.How can I place an order for SMBG18A-E3/52 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBG18A-E3/52 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 SMBG18A-E3/52 reliable?

The price and inventory of SMBG18A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG18A-E3/52 is usually 5 days.

3.What payment methods are accepted for SMBG18A-E3/52?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18A-E3/52 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBG18A-E3/52?

SMBG18A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBG18A-E3/52 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 SMBG18A-E3/52?

For technical support, including SMBG18A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18A-E3/52 requirements.

6.How does Aetrix verify that SMBG18A-E3/52 is sourced from the original manufacturer or authorized distributors?

All SMBG18A-E3/52 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 SMBG18A-E3/52 meets industry standards.

7.What is the process for return or replacement of SMBG18A-E3/52?

All SMBG18A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18A-E3/52, 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 SMBG18A-E3/52 part is unused and in its original packaging.

Return procedure for SMBG18A-E3/52:

1.Submit a request within 90 days.

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

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