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

Vishay General Semiconductor - Diodes Division SA40-E3/73

Name: SA40-E3/73
Brand: Vishay General Semiconductor - Diodes Division
SKU: SA40-E3/73
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SA40-E3/73

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

Package:: DO-204AC, DO-15, Axial

Datasheet:: SA40-E3/73.pdf

Description:: TVS DIODE 40VWM 71.4VC DO204AC

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Product details

Overview

SA40-E3/73 from Vishay General Semiconductor is a uni-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for circuit protection against ESD, lightning-induced surges, and inductive switching transients. It features a 40 V stand-off voltage (V_WM), 44.4–49.1 V breakdown voltage (V_BR) at 1 mA, 64.5 V maximum clamping voltage (V_C) at 7.8 A peak pulse current, and 500 W peak pulse power rating with 10/1000 μs waveform.

For engineers reviewing the SA40-E3/73 datasheet, SA40-E3/73 pinout, SA40-E3/73 application, or SA40-E3/73 equivalent, this device serves as a primary overvoltage clamp on DC power rails and signal lines in automotive body electronics, industrial I/O modules, and telecom interface circuits where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are required.

Technical Context

The SA40-E3/73 operates as a silicon avalanche diode with glass-passivated junction, enabling precise breakdown behavior and stable clamping under repetitive surge conditions. Its uni-directional polarity-marked by cathode band-supports integration into DC-biased circuits without reverse conduction during normal operation.

It delivers 500 W peak pulse power per 10/1000 μs waveform at T_A = 25 °C, derating linearly above 25 °C per Vishay's Fig. 2, and sustains 70 A non-repetitive forward surge current (I_FSM) per 8.3 ms half-sine wave. Junction temperature range spans –55 °C to +175 °C, supporting under-hood and industrial environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC bias margin.
V_BR (min/max)	44.4 V / 49.1 V at I_T = 1 mA - Tight breakdown window ensures predictable turn-on across production lots.
V_C @ I_PPM	64.5 V at 7.8 A - Clamping voltage limits transient energy delivered to downstream ICs during surge events.
P_PPM	500 W - Peak pulse power handling capability with 10/1000 μs waveform supports IEC 61000-4-5 Level 4 compliance.
I_FSM	70 A - Surge current rating enables robustness against motor-commutation spikes in 12 V automotive systems.
T_J max.	+175 °C - High junction temperature rating allows placement near heat sources in engine control units.
Package	DO-204AC (DO-15) - Industry-standard axial leaded package compatible with through-hole assembly and manual rework.

Pinout & Package

DO-204AC (DO-15) package with matte tin-plated leads; cathode indicated by color band on one end. Leads conform to J-STD-002 and JESD 22-B102 solderability standards. Solder dip rated at 275 °C max for 10 s.

Pin/Terminal	Circuit Role	Design Meaning
Anode	Forward current entry point	Connected to lower-potential side of protected line (e.g., ground or return path) in uni-directional configuration.
Cathode (banded end)	Avalanche clamping node	Connected to higher-potential side (e.g., 40 V rail or signal line); conducts during overvoltage to shunt surge to ground.

Key Features

Feature	Design Value
Glass passivated chip junction	Ensures stable V_BR tolerance and long-term reliability under thermal cycling and humidity exposure.
500 W peak pulse power (10/1000 μs)	Supports high-energy transient suppression without degradation in automotive load-dump or ISO 7637-2 Pulse 5a scenarios.
AEC-Q101 qualified	Validated for automotive applications including body control modules, lighting drivers, and sensor interfaces.
Low incremental surge resistance	Minimizes V_C overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic devices.
RoHS-compliant (E3 suffix)	Meets EU Directive 2011/65/EU with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE.

Applications

Automotive Body Control Unit (BCU)	Industrial PLC Digital Input Module
Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power rails from load dump and alternator ripple in 12 V vehicle systems. IC Role / Device Role / Timing Role: Uni-directional TVS clamp placed between 12 V supply and ground, triggered within <1 ns to limit voltage to ≤64.5 V during 100 V/500 ms transients. Use Value: Prevents latch-up and permanent damage to 3.3 V MCU I/O pins and 5 V CAN PHYs while maintaining system uptime per ISO 16750-2.	Use Scenario: Shielding 24 V DC digital input channels from field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to clamp induced transients before they reach optocoupler input stages. Use Value: Enables >100,000 actuation cycles without degradation, meeting IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity requirements.
Telecom Base Station Power Interface	Consumer Appliance Motor Driver Board
Use Scenario: Safeguarding 48 V PoE-powered Ethernet PHYs and DC-DC converters from lightning-induced common-mode surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary front-end clamp on DC input rail, coordinated with secondary GDT and MOV stages for staged energy diversion. Use Value: Reduces failure rate of $20+ PHY ICs by limiting transient voltage to <65 V, extending mean time between failures (MTBF) beyond 10 years.	Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to absorb inductive kickback energy during PWM commutation. Use Value: Eliminates contact arcing in relay drivers and prevents false resets in motor control MCUs during stall conditions.

Automotive Body Control Unit (BCU)

Industrial PLC Digital Input Module

Use Scenario: Protecting microcontroller GPIOs and CAN transceiver power rails from load dump and alternator ripple in 12 V vehicle systems.

IC Role / Device Role / Timing Role: Uni-directional TVS clamp placed between 12 V supply and ground, triggered within <1 ns to limit voltage to ≤64.5 V during 100 V/500 ms transients.

Use Value: Prevents latch-up and permanent damage to 3.3 V MCU I/O pins and 5 V CAN PHYs while maintaining system uptime per ISO 16750-2.

Use Scenario: Shielding 24 V DC digital input channels from field-wiring induced surges in factory automation cabinets.

IC Role / Device Role / Timing Role: Standoff-rated TVS connected across input terminals to clamp induced transients before they reach optocoupler input stages.

Use Value: Enables >100,000 actuation cycles without degradation, meeting IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity requirements.

Telecom Base Station Power Interface

Consumer Appliance Motor Driver Board

Use Scenario: Safeguarding 48 V PoE-powered Ethernet PHYs and DC-DC converters from lightning-induced common-mode surges on outdoor cabling.

IC Role / Device Role / Timing Role: Primary front-end clamp on DC input rail, coordinated with secondary GDT and MOV stages for staged energy diversion.

Use Value: Reduces failure rate of $20+ PHY ICs by limiting transient voltage to <65 V, extending mean time between failures (MTBF) beyond 10 years.

Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in washing machine control boards.

IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals to absorb inductive kickback energy during PWM commutation.

Use Value: Eliminates contact arcing in relay drivers and prevents false resets in motor control MCUs during stall conditions.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ40A-E3/5T	Same V_WM (40 V), identical DO-214AC (SMA) package; 5.0 W steady-state power vs. SA40-E3/73's 3.0 W; slightly higher V_C (69.4 V).	Surface-mount alternative for space-constrained PCBs; lacks AEC-Q101 qualification unless specified as SMAJ40AH.	Select when board area is limited and reflow compatibility is required; verify thermal relief for 3 W dissipation.
1.5KE40A	Higher P_PPM (1500 W), larger DO-201AD package; same V_WM/V_BR range but slower response due to higher junction capacitance (~150 pF vs. ~50 pF).	Better suited for high-energy AC mains protection; less optimal for fast-edge digital signal lines.	Choose for legacy designs requiring higher surge margin or where DO-201AD footprint is already allocated.

Compared with SMAJ40A-E3/5T and 1.5KE40A, the SA40-E3/73 offers AEC-Q101 qualification and tighter V_BR tolerance in a cost-effective through-hole DO-15 package, making it optimal for automotive and industrial applications where reliability, proven qualification, and ease of manual repair are prioritized over ultra-high surge rating or SMT density.

Availability

SA40-E3/73 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input protection, and telecom power interface designs requiring stable component supply, long-lifecycle support, and traceable RoHS-compliant sourcing.

Supply support for SA40-E3/73 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, automotive qualification, and high-volume manufacturability.

The SAxx series is part of Vishay's TRANSZORB® TVS family, engineered specifically for robust transient suppression in harsh environments-including automotive, industrial, and telecom infrastructure-where fast response, stable clamping, and AEC-Q101 validation are mandatory.

FAQ

What is the exact breakdown voltage range for SA40-E3/73?

The SA40-E3/73 has a guaranteed breakdown voltage (V_BR) range of 44.4 V to 49.1 V measured at test current I_T = 1 mA, per Vishay Document 88378. This tight 10.6% tolerance ensures consistent clamping behavior across production batches and supports reliable design margining for 40 V nominal systems.

Is SA40-E3/73 qualified for automotive use?

Yes, SA40-E3/73 is AEC-Q101 qualified, as confirmed in Vishay's datasheet revision 18-Sep-12 (Document Number: 88378). The "E3" suffix denotes RoHS-compliant commercial grade, and the device meets stress testing requirements for temperature cycling, humidity, and mechanical shock applicable to automotive electronic control units.

What is the maximum clamping voltage of SA40-E3/73 under surge conditions?

The SA40-E3/73 exhibits a maximum clamping voltage (V_C) of 64.5 V at peak pulse current (I_PPM) = 7.8 A with a 10/1000 μs waveform. This value is measured per standard test conditions and defines the upper voltage limit imposed on protected circuitry during transient events.

Does SA40-E3/73 have polarity marking, and how is it identified?

Yes, SA40-E3/73 is a uni-directional TVS diode with polarity marking: a single color band on the cathode end. During PCB layout, the banded terminal must connect to the higher-potential side (e.g., 40 V rail), while the anode connects to ground or return path to ensure proper avalanche conduction during overvoltage.

What package type and lead finish does SA40-E3/73 use?

SA40-E3/73 uses the DO-204AC (DO-15) axial-leaded package with matte tin-plated leads. The finish complies with J-STD-002 and JESD 22-B102 solderability standards, and the device passes JESD 201 Class 1A whisker testing, ensuring long-term interconnect reliability in vibration-prone environments.

SA40-E3/73 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

Package/Case:: DO-204AC, DO-15, Axial

Series:: TransZorb®

Packaging:: Tape & Box (TB)

Product Status:: Obsolete

Type:: Zener

Unidirectional Channels:: 1

Bidirectional Channels:: -

Voltage - Reverse Standoff (Typ):: 40V

Voltage - Breakdown (Min):: 44.4V

Voltage - Clamping (Max) @ Ipp:: 71.4V

Current - Peak Pulse (10/1000µs):: 7A

Power - Peak Pulse:: 500W

Power Line Protection:: No

Applications:: General Purpose

Capacitance @ Frequency:: -

Operating Temperature:: -55°C ~ 175°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: DO-204AC (DO-15)

SA40-E3/73 FAQ

1.How can I place an order for SA40-E3/73 through Aetrix?

Please submit a Request for Quotation (RFQ) for SA40-E3/73 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 SA40-E3/73 reliable?

The price and inventory of SA40-E3/73 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40-E3/73 is usually 5 days.

3.What payment methods are accepted for SA40-E3/73?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40-E3/73 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SA40-E3/73?

SA40-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SA40-E3/73 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 SA40-E3/73?

For technical support, including SA40-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40-E3/73 requirements.

6.How does Aetrix verify that SA40-E3/73 is sourced from the original manufacturer or authorized distributors?

All SA40-E3/73 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 SA40-E3/73 meets industry standards.

7.What is the process for return or replacement of SA40-E3/73?

All SA40-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA40-E3/73, 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 SA40-E3/73 part is unused and in its original packaging.

Return procedure for SA40-E3/73:

1.Submit a request within 90 days.

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

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