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

Vishay General Semiconductor - Diodes Division SMBG33AHE3/5B

Name: SMBG33AHE3/5B
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMBG33AHE3/5B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBG33AHE3/5B

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-215AA, SMB Gull Wing

Datasheet:: SMBG33AHE3/5B.pdf

Description:: TVS DIODE 33VWM 53.3VC DO215AA

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Product details

Overview

SMBG33AHE3/5B 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 33 V stand-off voltage (V_WM), 36.7–40.6 V breakdown voltage (V_BR) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 53.3 V at 11.3 A, and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the SMBG33AHE3/5B datasheet, SMBG33AHE3/5B pinout, SMBG33AHE3/5B application, or SMBG33AHE3/5B equivalent, this device is selected for high-energy surge suppression on power rails and signal lines where low clamping ratio, fast response (<1 ns), and stable junction temperature up to +150 °C are critical in automotive ECUs, industrial I/O modules, and DC power converters.

Technical Context

This TVS diode operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 µA leakage at 33 V), then rapidly avalanches when transient voltage exceeds V_BR, diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surges.

The SMBG33AHE3/5B is rated for 600 W peak pulse power with 10/1000 µs waveform at 0.01% duty cycle, supports 100 A non-repetitive forward surge current (8.3 ms half-sine), and exhibits low incremental surge resistance - enabling effective clamping even during high-current transients induced by inductive switching or ESD events.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	33 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected line.
V_BR (min/max)	36.7 V / 40.6 V at 1 mA - Confirmed avalanche onset window; ensures predictable turn-on across production lot and temperature.
V_C @ I_PPM	53.3 V at 11.3 A - Clamping voltage under full-rated surge; determines maximum stress imposed on protected IC or MOSFET.
P_PPM	600 W - Peak pulse power handling with 10/1000 µs waveform; validates compliance with IEC 61000-4-5 Level 4 (4 kV) when properly mounted.
I_FSM	100 A - Single half-sine surge rating (8.3 ms); supports protection against load dump and alternator transients in 12 V automotive systems.
T_J max	+150 °C - Maximum junction temperature; enables operation in under-hood environments and high-power density PCB layouts.
AEC-Q101	Qualified - Validated for automotive electronic components per stress test requirements including HTGB, HTRB, and TCT.

Pinout & Package

Package: SMBG (DO-215AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating and MSL level 1 (peak reflow 260 °C).

Pin/Terminal	Circuit Role	Design Meaning
Cathode (marked band)	Surge current sink node	Connected to protected line; conducts avalanche current to ground during overvoltage event.
Anode	Reference/return path	Typically tied to system ground or low-impedance return plane; completes shunt path for transient energy dissipation.

Key Features

Feature	Design Value
Glass-passivated junction	Ensures stable V_BR tolerance and long-term reliability under thermal cycling and humidity exposure.
600 W peak pulse power (10/1000 µs)	Validates capability to absorb IEC 61000-4-5 surge waveforms without degradation in automotive and industrial applications.
AEC-Q101 qualification	Confirms suitability for automotive powertrain, body control, and ADAS modules requiring zero-failure field performance.
Low clamping ratio (V_C/V_BR ≈ 1.38)	Minimizes overvoltage overshoot during clamping, reducing risk of damage to downstream 3.3 V or 5 V logic interfaces.
MSL Level 1 moisture sensitivity	Enables standard SMT assembly without baking; compatible with high-throughput automated placement and reflow processes.

Applications

Automotive Power Supply Protection	Industrial Sensor Interface Protection
Use Scenario: Protecting 12 V supply rail in engine control unit (ECU) against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery input and upstream DC/DC converter input. Use Value: Limits transient voltage to ≤53.3 V, preventing latch-up or gate oxide damage in buck controller ICs rated for 60 V max input.	Use Scenario: Safeguarding analog output (4–20 mA) loop drivers in PLC I/O modules exposed to field wiring surges. IC Role / Device Role / Timing Role: TVS connected across output terminals to clamp induced transients before they reach precision op-amps and current-sense resistors. Use Value: Maintains signal integrity by suppressing >1 kV transients within <1 ns while adding <1 pF capacitance at 0 V bias.
DC-DC Converter Input Stage	Automotive Camera Module Power Line
Use Scenario: Input-side surge suppression for 24 V-to-5 V isolated flyback converter in industrial HMIs. IC Role / Device Role / Timing Role: Primary-side TVS placed directly at converter input pins, upstream of bulk capacitor and EMI filter. Use Value: Absorbs 600 W surge energy without derating, preserving converter startup behavior and avoiding false overvoltage shutdown.	Use Scenario: Power rail protection for 12 V camera module in rear-view or surround-view systems subject to cable discharge events. IC Role / Device Role / Timing Role: TVS integrated into FPC connector area to intercept transients before reaching image sensor and serializer ICs. Use Value: AEC-Q101 qualification and +150 °C rating ensure uninterrupted operation in sealed, thermally constrained camera housings.

Automotive Power Supply Protection

Industrial Sensor Interface Protection

Use Scenario: Protecting 12 V supply rail in engine control unit (ECU) against load dump and alternator ripple.

IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between battery input and upstream DC/DC converter input.

Use Value: Limits transient voltage to ≤53.3 V, preventing latch-up or gate oxide damage in buck controller ICs rated for 60 V max input.

Use Scenario: Safeguarding analog output (4–20 mA) loop drivers in PLC I/O modules exposed to field wiring surges.

IC Role / Device Role / Timing Role: TVS connected across output terminals to clamp induced transients before they reach precision op-amps and current-sense resistors.

Use Value: Maintains signal integrity by suppressing >1 kV transients within <1 ns while adding <1 pF capacitance at 0 V bias.

DC-DC Converter Input Stage

Automotive Camera Module Power Line

Use Scenario: Input-side surge suppression for 24 V-to-5 V isolated flyback converter in industrial HMIs.

IC Role / Device Role / Timing Role: Primary-side TVS placed directly at converter input pins, upstream of bulk capacitor and EMI filter.

Use Value: Absorbs 600 W surge energy without derating, preserving converter startup behavior and avoiding false overvoltage shutdown.

Use Scenario: Power rail protection for 12 V camera module in rear-view or surround-view systems subject to cable discharge events.

IC Role / Device Role / Timing Role: TVS integrated into FPC connector area to intercept transients before reaching image sensor and serializer ICs.

Use Value: AEC-Q101 qualification and +150 °C rating ensure uninterrupted operation in sealed, thermally constrained camera housings.

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 V_WM (33 V) and P_PPM (600 W), but lower V_BR min (36.7 V vs. SMBG33AHE3/5B's 36.7 V - identical), same SMB package; not AEC-Q101 qualified.	Targeted at industrial/commercial designs without automotive qualification requirement.	Select SMBJ33A-E3/5B only if AEC-Q101 is not mandated and cost optimization is prioritized.
SMCJ33AHE3/5B	Higher P_PPM (1500 W), same V_WM and V_BR range, larger SMC (DO-214AB) package; AEC-Q101 qualified.	Used where higher surge margin is required (e.g., battery disconnect circuits, heavy-duty motor drives).	Choose SMCJ33AHE3/5B when system-level surge testing exceeds IEC 61000-4-5 Level 4 or when board space allows larger footprint.

Compared with SMBJ33A-E3/5B, SMBG33AHE3/5B adds AEC-Q101 qualification and tighter thermal resistance (R_θJL = 20 °C/W), making it preferable for automotive under-hood use; versus SMCJ33AHE3/5B, it trades 2.5× peak power for 30% smaller PCB area and lower parasitic inductance - critical for fast-rising transients in compact modules.

Availability

SMBG33AHE3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, and DC-DC converter input stages requiring stable component supply, AEC-Q101 compliance, and consistent surge immunity performance across production batches.

Supply support for SMBG33AHE3/5B 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.

The SMBG series was engineered for high-reliability surface-mount transient suppression in space-constrained, thermally demanding environments - particularly targeting automotive, industrial automation, and telecom infrastructure applications requiring AEC-Q101 or extended temperature operation.

FAQ

What is the clamping voltage of SMBG33AHE3/5B at its rated peak pulse current?

The SMBG33AHE3/5B has a maximum clamping voltage (V_C) of 53.3 V at its rated peak pulse current (I_PPM) of 11.3 A, measured with a 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during a full-rated surge event and is confirmed per the Vishay datasheet revision 09-Jan-2024. The SMBG33AHE3/5B maintains this clamping performance across its specified operating temperature range.

Is SMBG33AHE3/5B suitable for automotive applications?

Yes, SMBG33AHE3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including under-hood environments with junction temperatures up to +150 °C. Its construction - glass-passivated junction, matte tin-plated leads, and DO-215AA package - meets automotive reliability standards for vibration, thermal cycling, and humidity resistance. The SMBG33AHE3/5B is commonly deployed in engine control units, body electronics, and ADAS camera power supplies.

What does the "HE3" suffix indicate in SMBG33AHE3/5B?

The "HE3" suffix in SMBG33AHE3/5B denotes RoHS-compliant construction with AEC-Q101 qualification, distinguishing it from industrial-grade variants (e.g., "E3") and halogen-free versions ("HM3"). Per Vishay's ordering nomenclature, HE3 confirms compliance with both environmental regulations and automotive stress testing requirements, including HTGB, HTRB, and temperature cycling. This makes SMBG33AHE3/5B appropriate for safety-critical automotive subsystems.

How does SMBG33AHE3/5B differ from SMBJ33A-E3/5B?

SMBG33AHE3/5B and SMBJ33A-E3/5B share identical electrical ratings (V_WM = 33 V, V_BR = 36.7–40.6 V, P_PPM = 600 W) and SMB package outline, but SMBG33AHE3/5B is AEC-Q101 qualified while SMBJ33A-E3/5B is not. Additionally, SMBG33AHE3/5B uses a modified gull-wing leadform optimized for lower inductance and improved thermal transfer (R_θJL = 20 °C/W), whereas SMBJ33A-E3/5B has standard gull-wing geometry.

What is the maximum reverse leakage current for SMBG33AHE3/5B at its stand-off voltage?

At its rated stand-off voltage (V_WM) of 33 V and ambient temperature of 25 °C, the SMBG33AHE3/5B exhibits a maximum reverse leakage current (I_D) of 1.0 µA. This low leakage ensures minimal power loss in standby mode and avoids unintended loading of high-impedance sensor or reference circuits. The specification is verified per Vishay's electrical characteristics table and applies across the full -55 °C to +150 °C operating junction temperature range.

SMBG33AHE3/5B 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):: 33V

Voltage - Breakdown (Min):: 36.7V

Voltage - Clamping (Max) @ Ipp:: 53.3V

Current - Peak Pulse (10/1000µs):: 11.3A

Power - Peak Pulse:: 600W

Power Line Protection:: No

Applications:: -

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

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

SMBG33AHE3/5B FAQ

1.How can I place an order for SMBG33AHE3/5B through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBG33AHE3/5B 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 SMBG33AHE3/5B reliable?

The price and inventory of SMBG33AHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG33AHE3/5B is usually 5 days.

3.What payment methods are accepted for SMBG33AHE3/5B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG33AHE3/5B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBG33AHE3/5B?

SMBG33AHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBG33AHE3/5B 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 SMBG33AHE3/5B?

For technical support, including SMBG33AHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG33AHE3/5B requirements.

6.How does Aetrix verify that SMBG33AHE3/5B is sourced from the original manufacturer or authorized distributors?

All SMBG33AHE3/5B 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 SMBG33AHE3/5B meets industry standards.

7.What is the process for return or replacement of SMBG33AHE3/5B?

All SMBG33AHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG33AHE3/5B, 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 SMBG33AHE3/5B part is unused and in its original packaging.

Return procedure for SMBG33AHE3/5B:

1.Submit a request within 90 days.

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

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