Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Vishay General Semiconductor - Diodes Division SMBG33-E3/5B

Name: SMBG33-E3/5B
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMBG33-E3/5B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: SMBG33-E3/5B

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-215AA, SMB Gull Wing

Datasheet:: SMBG33-E3/5B.pdf

Description:: TVS DIODE 33VWM 59VC DO215AA

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:8,411

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

SMBG33-E3/5B from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode in DO-215AA (SMBG) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 33 V stand-off voltage (V_WM), 36.7–40.6 V breakdown voltage (V_BR) at 1 mA, 53.3 V clamping voltage (V_C) at 11.3 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power electronics and industrial sensor interfaces.

For engineers reviewing the SMBG33-E3/5B datasheet, SMBG33-E3/5B pinout, SMBG33-E3/5B application, or SMBG33-E3/5B equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, MSL Level 1 moisture sensitivity, 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 voltage-clamping device in reverse-biased configuration, triggering avalanche conduction when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable leakage performance and fast response time (<1 ns), while low incremental surge resistance enables effective energy diversion during ESD or load-switching transients.

The SMBG33-E3/5B is rated for 100 A non-repetitive forward surge current (I_FSM, 8.3 ms half-sine), exhibits 100 °C/W junction-to-ambient thermal resistance, and maintains ≤1.0 µA reverse leakage at V_WM - supporting reliable operation in high-reliability automotive and industrial environments where thermal derating above 25 °C must be applied per Fig. 2.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	33 V - maximum continuous reverse operating voltage before clamping begins
V_BR (min/max)	36.7 V / 40.6 V at 1 mA - guaranteed avalanche initiation range under standardized test conditions
V_C @ I_PPM	53.3 V at 11.3 A - peak clamped voltage during 600 W transient, defining protected circuit's worst-case overvoltage
P_PPM	600 W - peak pulse power handling with 10/1000 µs waveform, 0.01% duty cycle
I_FSM	100 A - single half-sine surge current rating (8.3 ms), critical for inductive load switching protection
T_J max	+150 °C - maximum junction temperature, enabling use in under-hood automotive locations
MSL Level	Level 1 (J-STD-020) - no floor life limitation; safe for reflow up to 260 °C peak

Pinout & Package

DO-215AA (SMBG) surface-mount package: molded epoxy case meeting UL 94 V-0, matte tin-plated leads solderable per J-STD-002/JESD 22-B102, cathode indicated by band marking.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry / transient return path	Connected to lower-potential side (e.g., ground or return rail) in unidirectional clamp configuration
Cathode	Avalanche conduction terminal / protected line connection	Connected to protected line (e.g., 33 V supply rail); band-marked end defines polarity orientation

Key Features

Feature	Design Value
Glass-passivated junction	Ensures stable V_BR tolerance and low leakage (<1 µA at V_WM) across temperature and lifetime
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness
600 W peak pulse power	Provides sufficient energy absorption for ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 4 transients
Low-profile DO-215AA package	Enables high-density PCB layouts and compatibility with standard SMT pick-and-place equipment
RoHS-compliant, whisker-tested (JESD 201 Class 1A)	Meets automotive supply chain material requirements and mitigates tin whisker risk in long-life applications

Applications

Automotive Power Rail Protection	Industrial Sensor Signal Line Clamping
Use Scenario: Protecting 33 V battery-fed control modules (e.g., body control units) against load-dump and jump-start transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 33 V rail and chassis ground to clamp surges above 53.3 V. Use Value: Prevents damage to downstream regulators and microcontrollers by limiting overvoltage to <54 V during 600 W transients.	Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to EMI and cable coupling. IC Role / Device Role / Timing Role: Bidirectional clamping not applicable; SMBG33-E3/5B used in unidirectional configuration on powered signal lines referenced to local ground. Use Value: Maintains signal integrity by suppressing sub-µs transients without adding capacitance (>100 pF) that would distort loop timing.
DC-DC Converter Input Stage	Telecom Power Supply Surge Suppression
Use Scenario: Input-side protection of 33 V input buck converters in railway signaling equipment subjected to lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter and controller IC. Use Value: Absorbs 600 W pulses without degradation, preserving converter uptime and eliminating need for redundant protection stages.	Use Scenario: Secondary-side 33 V rail protection in telecom rectifier modules compliant with ITU-T K.20/21 immunity standards. IC Role / Device Role / Timing Role: Fast-response clamping element on -48 V derived 33 V distribution bus. Use Value: Meets AEC-Q101 stress requirements and supports 150 °C ambient operation in sealed outdoor cabinets.

Automotive Power Rail Protection

Industrial Sensor Signal Line Clamping

Use Scenario: Protecting 33 V battery-fed control modules (e.g., body control units) against load-dump and jump-start transients.

IC Role / Device Role / Timing Role: Unidirectional TVS placed between 33 V rail and chassis ground to clamp surges above 53.3 V.

Use Value: Prevents damage to downstream regulators and microcontrollers by limiting overvoltage to <54 V during 600 W transients.

Use Scenario: Safeguarding analog output lines (e.g., 4–20 mA current loops) in factory automation sensors exposed to EMI and cable coupling.

IC Role / Device Role / Timing Role: Bidirectional clamping not applicable; SMBG33-E3/5B used in unidirectional configuration on powered signal lines referenced to local ground.

Use Value: Maintains signal integrity by suppressing sub-µs transients without adding capacitance (>100 pF) that would distort loop timing.

DC-DC Converter Input Stage

Telecom Power Supply Surge Suppression

Use Scenario: Input-side protection of 33 V input buck converters in railway signaling equipment subjected to lightning-induced surges.

IC Role / Device Role / Timing Role: Primary overvoltage clamp upstream of input filter and controller IC.

Use Value: Absorbs 600 W pulses without degradation, preserving converter uptime and eliminating need for redundant protection stages.

Use Scenario: Secondary-side 33 V rail protection in telecom rectifier modules compliant with ITU-T K.20/21 immunity standards.

IC Role / Device Role / Timing Role: Fast-response clamping element on -48 V derived 33 V distribution bus.

Use Value: Meets AEC-Q101 stress requirements and supports 150 °C ambient operation in sealed outdoor cabinets.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ33A-E3/5B	Same DO-215AB (SMB) package but slightly larger footprint; identical V_WM/V_C specs and 600 W rating	Not AEC-Q101 qualified; intended for commercial/industrial use only	Select SMBJ33A-E3/5B only if automotive qualification is unnecessary and board space allows minor pad layout change
SMCJ33A-E3/5B	DO-214AB (SMC) package; higher 1500 W P_PPM, same V_WM/V_C, but 3× larger footprint and 2× higher thermal mass	Used where higher surge margin is required and PCB area permits larger device	Choose SMCJ33A-E3/5B when system-level testing demands >1000 W surge capability or extended thermal endurance

Compared with SMBJ33A-E3/5B and SMCJ33A-E3/5B, the SMBG33-E3/5B uniquely combines AEC-Q101 qualification, DO-215AA's compact size, and precise 33 V stand-off in a single RoHS-compliant, whisker-tested package - making it the optimal choice for space-constrained automotive electronics requiring certified reliability.

Availability

SMBG33-E3/5B is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interface protection, and telecom DC distribution systems requiring stable component supply, full traceability, and long-term lifecycle support.

Supply support for SMBG33-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.

The SMBG series was developed specifically for high-reliability surface-mount transient suppression in automotive and industrial environments, balancing compact size, AEC-Q101 compliance, and robust 600 W surge handling in the DO-215AA outline.

FAQ

What is the clamping voltage of SMBG33-E3/5B at its rated peak pulse current?

The SMBG33-E3/5B has a maximum clamping voltage (V_C) of 53.3 V at its specified peak pulse current (I_PPM) of 11.3 A, measured using a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a 600 W transient event and is critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMBG33-E3/5B maintains this clamping performance across its qualified operating temperature range.

Is SMBG33-E3/5B suitable for automotive applications?

Yes, SMBG33-E3/5B is AEC-Q101 qualified and explicitly rated for automotive use. Its construction includes glass-passivated junction, MSL Level 1 moisture sensitivity rating, JESD 201 Class 1A whisker resistance, and guaranteed operation from –55 °C to +150 °C. These attributes make SMBG33-E3/5B appropriate for under-hood and cabin modules where reliability under thermal cycling and vibration is mandatory.

What does the "E3/5B" suffix indicate in SMBG33-E3/5B?

The "E3" denotes RoHS-compliant, commercial-grade construction with matte tin plating and JESD 201 Class 1A whisker testing. The "/5B" specifies packaging: 3200 units per 13-inch diameter plastic tape-and-reel - optimized for high-volume SMT assembly. This differs from "/52", which indicates 750 units per 7-inch reel. Both variants share identical electrical and thermal specifications.

How does SMBG33-E3/5B differ from bi-directional TVS diodes like SMBG33CA?

SMBG33-E3/5B is unidirectional and functions only in reverse-bias avalanche mode, requiring correct polarity installation (cathode to protected line). In contrast, SMBG33CA is bi-directional with symmetrical breakdown in both directions and no polarity marking. The SMBG33-E3/5B offers lower leakage and tighter V_BR tolerance than its CA counterpart, making it preferred for DC rail protection where polarity is fixed and leakage sensitivity matters.

What is the thermal resistance of SMBG33-E3/5B, and how does it affect layout design?

SMBG33-E3/5B has a typical junction-to-ambient thermal resistance (R_θJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimal PCB copper; designers must allocate adequate copper area and consider thermal derating above 25 °C per Fig. 2 in the datasheet. For sustained surge duty, enhancing pad size or adding internal planes improves heat dissipation and preserves SMBG33-E3/5B's 150 °C T_J rating.

SMBG33-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:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 33V

Voltage - Breakdown (Min):: 36.7V

Voltage - Clamping (Max) @ Ipp:: 59V

Current - Peak Pulse (10/1000µs):: 10.2A

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)

SMBG33-E3/5B FAQ

1.How can I place an order for SMBG33-E3/5B through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBG33-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 SMBG33-E3/5B reliable?

The price and inventory of SMBG33-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 SMBG33-E3/5B is usually 5 days.

3.What payment methods are accepted for SMBG33-E3/5B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG33-E3/5B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBG33-E3/5B?

SMBG33-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBG33-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 SMBG33-E3/5B?

For technical support, including SMBG33-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG33-E3/5B requirements.

6.How does Aetrix verify that SMBG33-E3/5B is sourced from the original manufacturer or authorized distributors?

All SMBG33-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 SMBG33-E3/5B meets industry standards.

7.What is the process for return or replacement of SMBG33-E3/5B?

All SMBG33-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG33-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 SMBG33-E3/5B part is unused and in its original packaging.

Return procedure for SMBG33-E3/5B:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-11 Comparator Circuit: Voltage Thresholds, Op-Amp Differences, LM393 and Practical Design

Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.

2026-09-10 Schmitt Trigger Explained: Hysteresis, Circuits, Inverters and Applications

Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …