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

Vishay General Semiconductor - Diodes Division SMBG40A-E3/52

Name: SMBG40A-E3/52
Brand: Vishay General Semiconductor - Diodes Division
SKU: SMBG40A-E3/52
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBG40A-E3/52

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-215AA, SMB Gull Wing

Datasheet:: SMBG40A-E3/52.pdf

Description:: TVS DIODE 40VWM 64.5VC DO215AA

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Product details

Overview

SMBG40A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of sensitive electronics. It features 40 V stand-off voltage (V_WM), 44.4–49.1 V breakdown voltage (V_BR) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 64.5 V at 9.3 A, and AEC-Q101 qualification for automotive-grade reliability.

For engineers reviewing the SMBG40A-E3/52 datasheet, SMBG40A-E3/52 pinout, SMBG40A-E3/52 application, or SMBG40A-E3/52 equivalent, key selection criteria include unidirectional polarity, low clamping ratio (VC/VBR ≈ 1.34), 100 A IFSM surge rating, MSL Level 1 reflow compatibility, and RoHS-compliant matte tin terminations - all critical for automotive power rail and sensor line protection.

Technical Context

This TVS diode operates as a clamping device in parallel with protected circuitry, responding to transients within picoseconds via avalanche breakdown. Its glass-passivated junction ensures stable V_BR tolerance (±5 %) and low leakage (<1.0 µA at V_WM), while the SMBG package delivers thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead).

The device is rated for -55 °C to +150 °C operating junction temperature, supports 8.3 ms half-sine surge current up to 100 A (IFSM), and meets UL 497B recognition (QVGQ2) for telecom and industrial protectors. Its bidirectional counterpart SMBG40CA shares identical V_BR and PPPM but differs in polarity marking and dual-direction clamping behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	40 V - maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working margin.
V_BR (min/max)	44.4 V / 49.1 V at 1 mA - precise avalanche onset range; ensures predictable turn-on under transient stress.
V_C @ I_PPM	64.5 V at 9.3 A - clamped voltage during 10/1000 µs surge; limits downstream voltage stress to safe levels.
P_PPM	600 W - peak pulse power handling capability; enables protection against high-energy ESD and load dump events.
I_FSM	100 A - non-repetitive forward surge current rating (8.3 ms half-sine); supports automotive alternator load dump immunity.
T_J max	+150 °C - maximum junction temperature; allows operation in under-hood automotive environments.
AEC-Q101	Qualified - validated for automotive electronic systems 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. Cathode indicated by band on body; polarity critical for unidirectional operation.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Current entry point during forward conduction or clamping	Connected to lower-potential side (e.g., ground or return path); forms cathode-to-anode clamping path.
Cathode	Current exit point during clamping; marked with band	Connected to protected line (e.g., 12 V rail or signal input); determines directionality of suppression.

Key Features

Feature	Design Value
600 W peak pulse power (10/1000 µs)	Enables robust protection against ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surges without derating.
AEC-Q101 qualification	Validates reliability for automotive powertrain, body control, and ADAS modules requiring long-term field stability.
MSL Level 1 (260 °C peak)	Supports standard lead-free reflow assembly without moisture sensitivity concerns or baking requirements.
Glass passivated junction	Delivers tight V_BR tolerance (±5 %), low leakage (<1 µA), and stable performance across temperature and life cycle.
UL 497B recognized (QVGQ2)	Meets safety standards for telecom and industrial interface protection, simplifying system-level certification.

Applications

Automotive Power Rail Protection	Industrial Sensor Interface Protection
Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and ground, absorbing energy before it reaches downstream regulators and microcontrollers. Use Value: Limits clamped voltage to 64.5 V - well below typical 75 V automotive IC absolute maximum ratings - preventing latch-up or permanent damage.	Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation systems. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential or single-ended signal lines to shunt fast transients (<1 ns rise time) to ground. Use Value: Sub-100 pF junction capacitance (typ.) preserves signal integrity up to 10 MHz while clamping ±8 kV contact ESD per IEC 61000-4-2.
Telecom Line Interface Protection	Consumer Power Adapter Input Protection
Use Scenario: Safeguarding Ethernet PHY interfaces and DSL line drivers against lightning-induced surges and AC power cross-talk. IC Role / Device Role / Timing Role: UL 497B-recognized TVS deployed on primary-side data lines, coordinated with gas discharge tubes for multi-stage protection. Use Value: 600 W rating and 64.5 V clamping enable compliance with ITU-T K.20/K.21 surge immunity requirements for Class B equipment.	Use Scenario: Adding secondary-side overvoltage protection to AC/DC adapters used in smart home devices and USB-C PD accessories. IC Role / Device Role / Timing Role: Unidirectional TVS placed after rectifier output to clamp switching spikes and capacitor discharge transients. Use Value: 40 V V_WM matches common 36–42 V adapter output rails; 150 °C T_J max ensures reliability under sustained thermal stress.

Automotive Power Rail Protection

Industrial Sensor Interface Protection

Use Scenario: Protecting 12 V battery-fed ECUs from load dump transients (ISO 7637-2 Pulse 5a) and jump-start spikes.

IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and ground, absorbing energy before it reaches downstream regulators and microcontrollers.

Use Value: Limits clamped voltage to 64.5 V - well below typical 75 V automotive IC absolute maximum ratings - preventing latch-up or permanent damage.

Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) from ESD and cable discharge events in factory automation systems.

IC Role / Device Role / Timing Role: Low-capacitance TVS connected across differential or single-ended signal lines to shunt fast transients (<1 ns rise time) to ground.

Use Value: Sub-100 pF junction capacitance (typ.) preserves signal integrity up to 10 MHz while clamping ±8 kV contact ESD per IEC 61000-4-2.

Telecom Line Interface Protection

Consumer Power Adapter Input Protection

Use Scenario: Safeguarding Ethernet PHY interfaces and DSL line drivers against lightning-induced surges and AC power cross-talk.

IC Role / Device Role / Timing Role: UL 497B-recognized TVS deployed on primary-side data lines, coordinated with gas discharge tubes for multi-stage protection.

Use Value: 600 W rating and 64.5 V clamping enable compliance with ITU-T K.20/K.21 surge immunity requirements for Class B equipment.

Use Scenario: Adding secondary-side overvoltage protection to AC/DC adapters used in smart home devices and USB-C PD accessories.

IC Role / Device Role / Timing Role: Unidirectional TVS placed after rectifier output to clamp switching spikes and capacitor discharge transients.

Use Value: 40 V V_WM matches common 36–42 V adapter output rails; 150 °C T_J max ensures reliability under sustained thermal stress.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ40A-E3/52	Same V_WM/V_BR/P_PPM, but SMB (DO-214AA) package - 1.58 mm height vs. SMBG's 1.1 mm; R_θJA = 110 °C/W vs. 100 °C/W.	Less suitable for ultra-low-profile automotive modules where PCB space is constrained vertically.	Select SMBG40A-E3/52 when board height <1.2 mm is required or thermal performance above 100 °C/W is critical.
SMBG40CA-E3/52	Bidirectional variant: same V_WM/V_BR/P_PPM, but symmetrical clamping in both polarities; no cathode band marking.	Required for AC-coupled lines (e.g., RS-485, CAN FD) or circuits where polarity reversal risk exists.	Choose SMBG40A-E3/52 only for DC-biased unidirectional protection; use SMBG40CA-E3/52 for bidirectional signal paths.

Compared with SMBJ40A-E3/52, SMBG40A-E3/52 offers lower profile and better thermal resistance; compared with SMBG40CA-E3/52, it provides directional clamping essential for DC power rails - making SMBG40A-E3/52 optimal for compact, high-reliability automotive and industrial DC protection.

Availability

SMBG40A-E3/52 is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom line card prototyping requiring stable component supply, AEC-Q101 assurance, and RoHS-compliant sourcing.

Supply support for SMBG40A-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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, precision, and automotive-grade qualification.

The SMBG Transient Voltage Suppressor family targets high-energy surge protection in space-constrained, thermally demanding applications - especially automotive power distribution, industrial I/O modules, and telecom infrastructure where AEC-Q101 and UL recognition are mandatory.

FAQ

What is the clamping voltage of SMBG40A-E3/52 and how does it relate to system protection?

The SMBG40A-E3/52 has a maximum clamping voltage (V_C) of 64.5 V at 9.3 A (10/1000 µs waveform). This value defines the highest voltage seen by downstream circuitry during a surge event. Because SMBG40A-E3/52 clamps at 64.5 V - significantly below typical 75 V automotive IC absolute maximum ratings - it prevents overvoltage damage to regulators, MCUs, and interface ICs connected to the same rail. The low clamping ratio (V_C/V_BR ≈ 1.34) confirms efficient energy diversion without excessive voltage overshoot.

Is SMBG40A-E3/52 suitable for automotive applications, and what qualifications does it hold?

Yes, SMBG40A-E3/52 is explicitly AEC-Q101 qualified per the Vishay datasheet (Document Number: 88456, Revision: 09-Jan-2024), confirming its suitability for automotive electronics. It passes stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). The "E3" suffix denotes RoHS-compliant, industrial-grade construction, and the SMBG package meets MSL Level 1 for lead-free reflow - all essential for under-hood and chassis-mounted modules using SMBG40A-E3/52.

How does the SMBG (DO-215AA) package of SMBG40A-E3/52 differ from the more common SMB (DO-214AA)?

The SMBG (DO-215AA) package used by SMBG40A-E3/52 is dimensionally distinct from SMB (DO-214AA): it is lower profile (1.1 mm max height vs. 1.58 mm), has tighter terminal spacing (2.10 mm vs. 2.29 mm), and achieves lower thermal resistance (R_θJA = 100 °C/W vs. 110 °C/W). These differences make SMBG40A-E3/52 preferable in ultra-thin automotive modules and high-density industrial PCBs where vertical clearance and thermal performance are critical - unlike SMB variants which occupy more board real estate and dissipate heat less efficiently.

Can SMBG40A-E3/52 be used in bidirectional signal lines such as RS-485 or CAN?

No - SMBG40A-E3/52 is a unidirectional TVS diode, meaning it clamps only when the cathode is at higher potential than the anode. For bidirectional signal lines like RS-485 or CAN, where voltage polarity reverses during normal operation, a bidirectional variant such as SMBG40CA-E3/52 must be used. Using SMBG40A-E3/52 on such lines would result in forward conduction during negative half-cycles, causing malfunction or damage. Always match polarity type (unidirectional vs. bidirectional) to the signal architecture when selecting SMBG40A-E3/52.

What is the maximum leakage current of SMBG40A-E3/52 at its stand-off voltage, and why does it matter?

The SMBG40A-E3/52 exhibits a maximum reverse leakage current (I_D) of 1.0 µA at its 40 V stand-off voltage (V_WM). This ultra-low leakage is critical in battery-powered or high-impedance sensor circuits where even nanoamp-level currents can cause measurement drift, false triggering, or accelerated battery drain. The 1.0 µA spec - verified at 25 °C and derated per temperature - ensures minimal loading on protected nodes, preserving accuracy in precision analog front-ends and always-on automotive subsystems relying on SMBG40A-E3/52.

SMBG40A-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):: 40V

Voltage - Breakdown (Min):: 44.4V

Voltage - Clamping (Max) @ Ipp:: 64.5V

Current - Peak Pulse (10/1000µs):: 9.3A

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)

SMBG40A-E3/52 FAQ

1.How can I place an order for SMBG40A-E3/52 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBG40A-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 SMBG40A-E3/52 reliable?

The price and inventory of SMBG40A-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 SMBG40A-E3/52 is usually 5 days.

3.What payment methods are accepted for SMBG40A-E3/52?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG40A-E3/52 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBG40A-E3/52?

SMBG40A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBG40A-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 SMBG40A-E3/52?

For technical support, including SMBG40A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG40A-E3/52 requirements.

6.How does Aetrix verify that SMBG40A-E3/52 is sourced from the original manufacturer or authorized distributors?

All SMBG40A-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 SMBG40A-E3/52 meets industry standards.

7.What is the process for return or replacement of SMBG40A-E3/52?

All SMBG40A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG40A-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 SMBG40A-E3/52 part is unused and in its original packaging.

Return procedure for SMBG40A-E3/52:

1.Submit a request within 90 days.

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

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