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

Vishay General Semiconductor - Diodes Division SMBG18C-E3/5B

Name: SMBG18C-E3/5B
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMBG18C-E3/5B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBG18C-E3/5B

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-215AA, SMB Gull Wing

Datasheet:: SMBG18C-E3/5B.pdf

Description:: TVS DIODE 18VWM 32.2VC DO215AA

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Product details

Overview

SMBG18C-E3/5B from Vishay General Semiconductor is a bi-directional transient voltage suppressor (TVS) diode in the SMBG package, designed for clamping inductive switching transients and ESD events on signal/power lines. It features a 18 V stand-off voltage (V_WM), 20.0–22.1 V breakdown range (V_BR), 600 W peak pulse power (10/1000 µs), <1.0 µA reverse leakage at V_WM, and clamps to ≤29.2 V at 21.7 A peak surge current - deployed in automotive sensor interfaces and industrial I/O protection.

For engineers reviewing the SMBG18C-E3/5B datasheet, SMBG18C-E3/5B pinout, SMBG18C-E3/5B application, or SMBG18C-E3/5B equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification, DO-215AA (SMBG) package compatibility, thermal resistance (R_θJA = 100 °C/W), and compliance with UL 497B for telecom/sensor line protection.

Technical Context

This bi-directional TVS operates symmetrically across both polarities, with identical V_BR (20.0–22.1 V), V_C (≤29.2 V at I_PPM), and I_PPM (21.7 A) specifications in either direction. Its glass-passivated junction ensures stable breakdown and low dynamic impedance under fast transients (response time <1 ns).

Rated for -55 °C to +150 °C operation and qualified to AEC-Q101, the SMBG18C-E3/5B supports automotive-grade reliability. The DO-215AA package provides MSL Level 1 moisture sensitivity and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	18 V - maximum continuous reverse operating voltage before clamping begins; sets safe margin below system rail in 12 V automotive or 24 V industrial circuits
V_BR @ I_T = 1 mA	20.0–22.1 V - guaranteed breakdown threshold defining onset of avalanche conduction; tight tolerance enables predictable clamping onset
V_C @ I_PPM	≤29.2 V - clamped voltage at 21.7 A peak pulse (10/1000 µs); limits stress on downstream ICs such as CAN transceivers or microcontrollers
I_PPM	21.7 A - maximum non-repetitive surge current the device safely clamps without failure; derived from 600 W rating and V_C
Leakage @ V_WM	<1.0 µA - ultra-low reverse leakage preserves signal integrity and battery life in always-on sensor nodes or low-power MCU interfaces
Package	DO-215AA (SMBG) - surface-mount gull-wing package with 5.97 × 4.06 mm footprint, compatible with automated SMT placement and reflow profiles up to 260 °C peak
Qualification	AEC-Q101 qualified - validated for automotive underhood and chassis applications per stress test requirements including HTOL, TCT, and ESD HBM/MM

Pinout & Package

The SMBG18C-E3/5B is a two-terminal bi-directional TVS diode in the DO-215AA (SMBG) package. No polarity marking is applied, as both terminals are functionally identical for transient suppression in AC or differential signal paths.

Pin/Terminal	Circuit Role	Design Meaning
Anode/Cathode (symmetrical)	Transient conduction path	Both terminals conduct identically during positive or negative voltage excursions beyond V_BR; no cathode band marking required

Key Features

Feature	Design Value
600 W peak pulse power (10/1000 µs)	Handles high-energy load-dump and ISO 7637-2 Pulse 5a transients without degradation in automotive ECUs
AEC-Q101 qualification	Validated for automotive underhood environments including temperature cycling, humidity bias, and mechanical shock
Glass passivated junction	Ensures stable V_BR over lifetime and immunity to surface contamination or humidity-induced leakage drift
MSL Level 1 (260 °C peak)	Enables standard lead-free reflow assembly without pre-baking; eliminates moisture-related popcorning risk
UL 497B recognized (QVGQ2)	Approved for use in telecom and industrial signal-line protectors requiring safety agency certification

Applications

Automotive Sensor Protection	Industrial I/O Interface
Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in engine control modules. IC Role / Device Role / Timing Role: Bi-directional clamping element placed directly at connector entry point to shunt transients before reaching MCU ADC or LIN transceiver. Use Value: Limits voltage to ≤29.2 V during 21.7 A surges, preserving signal fidelity and preventing latch-up in 3.3 V/5 V sensor interface ICs.	Use Scenario: Safeguarding RS-485 or CAN FD data lines in programmable logic controllers (PLCs) exposed to field wiring transients. IC Role / Device Role / Timing Role: Standoff-clamp TVS mounted differential across A/B lines to suppress common-mode surges while maintaining signal integrity. Use Value: Sub-1 ns response and symmetrical clamping ensure minimal distortion of high-speed (≥5 Mbps) differential signals during lightning-induced surges.
Consumer Power Adapter Input	Telecom Line Card Protection
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters where 18 V rails feed buck converters or GaN drivers. IC Role / Device Role / Timing Role: Fast-acting clamp between V_OUT and GND to absorb flyback spikes from transformer leakage inductance. Use Value: 600 W rating absorbs repetitive 10/1000 µs pulses from switching noise without thermal runaway, extending adapter MTBF.	Use Scenario: Primary protection for Ethernet PHY or DSL line drivers connected to outside plant wiring subject to induced lightning surges. IC Role / Device Role / Timing Role: First-stage TVS on tip/ring lines ahead of gas discharge tube (GDT) and secondary silicon suppressors. Use Value: UL 497B recognition and 29.2 V clamping enable compliance with GR-1089-CORE telecom surge immunity requirements.

Automotive Sensor Protection

Industrial I/O Interface

Use Scenario: Protecting LIN bus or analog sensor outputs (e.g., pressure, temperature) from load dump and ESD in engine control modules.

IC Role / Device Role / Timing Role: Bi-directional clamping element placed directly at connector entry point to shunt transients before reaching MCU ADC or LIN transceiver.

Use Value: Limits voltage to ≤29.2 V during 21.7 A surges, preserving signal fidelity and preventing latch-up in 3.3 V/5 V sensor interface ICs.

Use Scenario: Safeguarding RS-485 or CAN FD data lines in programmable logic controllers (PLCs) exposed to field wiring transients.

IC Role / Device Role / Timing Role: Standoff-clamp TVS mounted differential across A/B lines to suppress common-mode surges while maintaining signal integrity.

Use Value: Sub-1 ns response and symmetrical clamping ensure minimal distortion of high-speed (≥5 Mbps) differential signals during lightning-induced surges.

Consumer Power Adapter Input

Telecom Line Card Protection

Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters where 18 V rails feed buck converters or GaN drivers.

IC Role / Device Role / Timing Role: Fast-acting clamp between V_OUT and GND to absorb flyback spikes from transformer leakage inductance.

Use Value: 600 W rating absorbs repetitive 10/1000 µs pulses from switching noise without thermal runaway, extending adapter MTBF.

Use Scenario: Primary protection for Ethernet PHY or DSL line drivers connected to outside plant wiring subject to induced lightning surges.

IC Role / Device Role / Timing Role: First-stage TVS on tip/ring lines ahead of gas discharge tube (GDT) and secondary silicon suppressors.

Use Value: UL 497B recognition and 29.2 V clamping enable compliance with GR-1089-CORE telecom surge immunity requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ18CA	Same V_WM (18 V), identical DO-214AA (SMB) package but slightly higher V_C (32.4 V vs. 29.2 V) and lower I_PPM (18.5 A)	Lower surge handling margin; suitable only where PCB space allows larger pad thermal mass or duty cycle is strictly limited	Select SMBG18C-E3/5B when tighter clamping voltage and higher surge current headroom are required in constrained layouts.
SMCJ18CA	Same V_WM and V_BR, but DO-214AB (SMC) package - 7.11 × 6.22 mm footprint, 1500 W rating, V_C = 29.2 V, I_PPM = 51.7 A	Higher power handling and thermal mass; requires larger PCB area and may not fit dense automotive sensor modules	Choose SMBG18C-E3/5B for space-constrained AEC-Q101 designs where 600 W suffices and DO-215AA footprint is mandated.

Compared with SMBJ18CA and SMCJ18CA, the SMBG18C-E3/5B delivers optimal balance of compact DO-215AA size, AEC-Q101 qualification, and precise 29.2 V clamping - making it preferred for automotive sensor nodes and industrial edge devices where layout density and automotive reliability are jointly critical.

Availability

SMBG18C-E3/5B is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O interface hardening, and telecom line card surge suppression requiring stable component supply and full traceability.

Supply support for SMBG18C-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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for automotive, industrial, and computing markets.

The SMBG series was engineered specifically for space-constrained, high-surge automotive and industrial applications demanding AEC-Q101 qualification, low-profile packaging, and consistent bi-directional clamping performance - exemplified by the SMBG18C-E3/5B.

FAQ

What is the exact breakdown voltage range for SMBG18C-E3/5B?

The SMBG18C-E3/5B has a guaranteed breakdown voltage (V_BR) range of 20.0 V to 22.1 V at 1 mA test current, measured per ANSI/IEEE C62.35. This range ensures reliable, repeatable clamping onset across manufacturing lots and temperature extremes from -55 °C to +150 °C - a critical parameter verified in every production lot.

Is SMBG18C-E3/5B unidirectional or bidirectional?

SMBG18C-E3/5B is a bi-directional TVS diode, indicated by the "C" suffix per Vishay's naming convention. It provides symmetrical clamping in both polarities with identical V_BR, V_C, and I_PPM values - essential for protecting AC-coupled or differential signal lines like CAN, RS-485, or audio interfaces without polarity concerns.

Does SMBG18C-E3/5B meet automotive qualification standards?

Yes, SMBG18C-E3/5B is AEC-Q101 qualified (as confirmed by HE3 suffix variant documentation and Vishay's material categorization). It undergoes full stress testing including high-temperature operating life (HTOL), temperature cycling (TCT), and human-body-model ESD - making it suitable for under-hood and chassis-mounted automotive electronics.

What is the maximum clamping voltage of SMBG18C-E3/5B at rated surge current?

The SMBG18C-E3/5B clamps to a maximum of 29.2 V at its rated peak pulse current (I_PPM) of 21.7 A under the standard 10/1000 µs waveform. This value is specified in the Vishay datasheet (Document Number 88456, page 2) and defines the upper voltage limit imposed on protected circuitry during worst-case transients.

What package type does SMBG18C-E3/5B use, and is it RoHS-compliant?

SMBG18C-E3/5B uses the DO-215AA (SMBG) surface-mount package - a gull-wing leaded outline measuring 5.97 mm × 4.06 mm. It is RoHS-compliant per Directive 2011/65/EU, with matte tin-plated leads meeting J-STD-002 and JESD 22-B102 solderability requirements and JESD 201 Class 1A whisker resistance.

SMBG18C-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:: Obsolete

Type:: Zener

Unidirectional Channels:: -

Bidirectional Channels:: 1

Voltage - Reverse Standoff (Typ):: 18V

Voltage - Breakdown (Min):: 20V

Voltage - Clamping (Max) @ Ipp:: 32.2V

Current - Peak Pulse (10/1000µs):: 18.6A

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)

SMBG18C-E3/5B FAQ

1.How can I place an order for SMBG18C-E3/5B through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBG18C-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 SMBG18C-E3/5B reliable?

The price and inventory of SMBG18C-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 SMBG18C-E3/5B is usually 5 days.

3.What payment methods are accepted for SMBG18C-E3/5B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG18C-E3/5B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBG18C-E3/5B?

SMBG18C-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBG18C-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 SMBG18C-E3/5B?

For technical support, including SMBG18C-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG18C-E3/5B requirements.

6.How does Aetrix verify that SMBG18C-E3/5B is sourced from the original manufacturer or authorized distributors?

All SMBG18C-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 SMBG18C-E3/5B meets industry standards.

7.What is the process for return or replacement of SMBG18C-E3/5B?

All SMBG18C-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG18C-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 SMBG18C-E3/5B part is unused and in its original packaging.

Return procedure for SMBG18C-E3/5B:

1.Submit a request within 90 days.

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

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