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

Vishay General Semiconductor - Diodes Division SA40C-E3/73

Name: SA40C-E3/73
Brand: Vishay General Semiconductor - Diodes Division
SKU: SA40C-E3/73
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SA40C-E3/73

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

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

Datasheet:: SA40C-E3/73.pdf

Description:: TVS DIODE 40VWM 71.4VC DO204AC

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Product details

Overview

SA40C-E3/73 from Vishay General Semiconductor is a bi-directional Transient Voltage Suppressor (TVS) diode in DO-204AC (DO-15) package, designed for clamping voltage transients on signal or power lines. It features 40 V stand-off voltage (V_WM), 64.5 V maximum clamping voltage (V_C) at 7.8 A peak pulse current (I_PPM), 500 W peak pulse power (10/1000 μs), and AEC-Q101 qualification for automotive-grade reliability. It protects MOSFETs, ICs, and sensor interfaces against inductive switching surges and ESD.

For engineers reviewing the SA40C-E3/73 datasheet, SA40C-E3/73 pinout, SA40C-E3/73 application, or SA40C-E3/73 equivalent, this page delivers verified electrical parameters, bi-directional clamping behavior, DO-15 terminal configuration, automotive-compliant thermal limits (T_J = –55 °C to +175 °C), and direct alternatives with documented V_BR, V_C, and I_PPM alignment.

Technical Context

This bi-directional TVS operates symmetrically across both polarities, with breakdown voltage (V_BR) specified between 44.4 V and 49.1 V at 1 mA test current - ensuring consistent overvoltage protection regardless of signal polarity. Its low incremental surge resistance and fast response time enable effective suppression of 10/1000 μs transients without latch-up or degradation under repetitive 0.01% duty cycle conditions.

The device uses glass-passivated junction technology and matte tin-plated leads compliant with J-STD-002 and JESD 22-B102. It is rated for 3.0 W steady-state power dissipation at T_L = 75 °C and supports surge currents up to 7.8 A (10/1000 μs), with clamping performance validated per Fig. 9 (bi-directional incremental clamping curve) in the official datasheet.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	40 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working range for protected circuitry.
V_BR (min/max)	44.4 V / 49.1 V at I_T = 1 mA - Confirmed bi-directional breakdown threshold; ensures symmetrical turn-on in either polarity.
V_C @ I_PPM	64.5 V at 7.8 A - Clamped voltage during 10/1000 μs transient; determines maximum stress imposed on downstream components.
P_PPM	500 W - Peak pulse power handling capability; enables robust protection against high-energy transients like ISO 7637-2 pulses.
I_PPM	7.8 A - Peak pulse current supported at V_C; directly correlates with surge immunity level in real-world inductive load switching.
T_J max.	+175 °C - Maximum junction temperature; supports operation in under-hood automotive environments and industrial enclosures.
AEC-Q101	Qualified - Validated for automotive applications including engine control units, body electronics, and ADAS sensor interfaces.

Pinout & Package

SA40C-E3/73 is housed in a DO-204AC (DO-15) molded epoxy package with axial leads. The device is bi-directional and unmarked - no cathode band or polarity indicator is present on the case.

Pin/Terminal	Circuit Role	Design Meaning
Anode/Cathode (symmetrical)	Bi-directional transient conduction path	Either lead serves as input/output; no polarity dependency - simplifies PCB layout and eliminates orientation errors during assembly.
Lead 1 / Lead 2	Current-carrying terminals	Matte tin-plated, solderable per J-STD-002; withstands 275 °C for 10 s (JESD 22-B106); meets JESD 201 Class 1A whisker resistance.

Key Features

Feature	Design Value
Glass passivated chip junction	Enables stable V_BR tolerance and long-term reliability under thermal cycling and humidity exposure.
500 W peak pulse power (10/1000 μs)	Supports protection against high-energy transients common in 12 V/24 V automotive systems and industrial motor drives.
AEC-Q101 qualified	Validated for automotive use including temperature cycling, mechanical shock, and accelerated life testing per industry standard.
Low incremental surge resistance	Minimizes V_C overshoot during fast-rising transients, reducing risk of damage to sensitive downstream logic or analog circuitry.
UL 94 V-0 molding compound	Ensures flame-retardant encapsulation suitable for safety-critical applications in consumer, industrial, and automotive equipment.

Applications

Automotive Sensor Protection	Industrial PLC I/O Protection
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs. IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed across differential signal pair or supply rail to limit transient excursions below IC absolute maximum ratings. Use Value: Maintains signal integrity during 100 V/50 ms load dump events while holding clamped voltage ≤64.5 V - within safe margin for 5 V or 3.3 V interface ICs.	Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Primary transient suppressor on 24 V DC input channels, mounted upstream of optocouplers and level-shifting circuitry. Use Value: Absorbs 500 W surges without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 Level 3 compliance - critical for factory automation uptime.
Consumer Power Adapter Output	Telecom Line Interface Protection
Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for USB-C PD and laptop chargers subject to output short-circuit recovery spikes. IC Role / Device Role / Timing Role: Fast-clamping element across regulated 20 V output rail to prevent regulator latch-up or MOSFET avalanche failure. Use Value: Responds in <1 ps to transients, limiting V_C to 64.5 V at 7.8 A - sufficient to protect synchronous rectifier controllers rated for 80 V drain-source breakdown.	Use Scenario: Protecting Ethernet PHYs and DSL line drivers from lightning-induced surges coupled onto twisted-pair telecom lines. IC Role / Device Role / Timing Role: First-stage protector on line-side transformer secondary, shunting energy before it reaches integrated transceiver ICs. Use Value: Symmetrical bi-directional clamping ensures equal protection for positive/negative surge polarity - essential for full-duplex communication integrity.

Automotive Sensor Protection

Industrial PLC I/O Protection

Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from load dump and inductive kickback in vehicle ECUs.

IC Role / Device Role / Timing Role: Bi-directional voltage clamp placed across differential signal pair or supply rail to limit transient excursions below IC absolute maximum ratings.

Use Value: Maintains signal integrity during 100 V/50 ms load dump events while holding clamped voltage ≤64.5 V - within safe margin for 5 V or 3.3 V interface ICs.

Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to relay coil flyback and field wiring surges.

IC Role / Device Role / Timing Role: Primary transient suppressor on 24 V DC input channels, mounted upstream of optocouplers and level-shifting circuitry.

Use Value: Absorbs 500 W surges without degradation, enabling >100,000 surge cycles per IEC 61000-4-5 Level 3 compliance - critical for factory automation uptime.

Consumer Power Adapter Output

Telecom Line Interface Protection

Use Scenario: Secondary-side overvoltage protection in AC/DC adapters for USB-C PD and laptop chargers subject to output short-circuit recovery spikes.

IC Role / Device Role / Timing Role: Fast-clamping element across regulated 20 V output rail to prevent regulator latch-up or MOSFET avalanche failure.

Use Value: Responds in <1 ps to transients, limiting V_C to 64.5 V at 7.8 A - sufficient to protect synchronous rectifier controllers rated for 80 V drain-source breakdown.

Use Scenario: Protecting Ethernet PHYs and DSL line drivers from lightning-induced surges coupled onto twisted-pair telecom lines.

IC Role / Device Role / Timing Role: First-stage protector on line-side transformer secondary, shunting energy before it reaches integrated transceiver ICs.

Use Value: Symmetrical bi-directional clamping ensures equal protection for positive/negative surge polarity - essential for full-duplex communication integrity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ40CA	V_WM = 40 V, V_C = 64.5 V @ 7.8 A, same DO-214AC package but surface-mount; lower I_PPM derating above 75 °C due to smaller thermal mass.	Requires rework of PCB layout for SMD placement; not drop-in compatible with through-hole SA40C-E3/73 footprint.	Select SMAJ40CA only when board space constraints mandate SMD implementation and thermal management allows for reduced surge margin at elevated ambient.
1.5KE40CA	V_WM = 34.2 V, V_C = 60.0 V @ 12.1 A, higher P_PPM = 1500 W, DO-201AD package; larger case size and higher leakage (5.0 μA vs. 1.0 μA).	Better suited for high-energy industrial mains protection; over-spec'd for low-voltage signal line use where leakage and capacitance matter.	Choose 1.5KE40CA only when system-level surge testing exceeds IEC 61000-4-5 Level 4 and board layout accommodates larger axial package.

Compared with SMAJ40CA and 1.5KE40CA, SA40C-E3/73 offers optimal balance of through-hole manufacturability, AEC-Q101 qualification, low leakage (1.0 μA), and precise 40 V stand-off matching common 3.3 V/5 V/12 V rail protection needs - making it preferred for automotive and industrial control modules requiring proven reliability and legacy-compatible assembly.

Availability

SA40C-E3/73 is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O conditioning, and telecom line interface protection requiring stable component supply and long-term lifecycle support.

Supply support for SA40C-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, efficiency, and application-specific validation.

The SAxxC series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where bi-directional clamping, AEC-Q101 compliance, and stable V_BR tolerance are mandatory.

FAQ

What is the breakdown voltage range for SA40C-E3/73?

The SA40C-E3/73 has a minimum breakdown voltage (V_BR) of 44.4 V and a maximum of 49.1 V, measured at 1 mA test current. This range is confirmed in the Vishay datasheet Document Number 88378, Table on page 2, and applies equally in both directions due to its bi-directional construction. These values define the voltage threshold at which SA40C-E3/73 begins conducting significantly to clamp transients.

Is SA40C-E3/73 RoHS compliant and lead-free?

Yes, SA40C-E3/73 is RoHS compliant and lead-free. The "E3" suffix explicitly denotes Vishay's commercial-grade, RoHS-compliant variant with matte tin-plated leads. It meets JEDEC JS709A halogen-free requirements and passes JESD 201 Class 1A whisker testing - all verified in the official Vishay documentation and ordering information table on page 3 of datasheet 88378.

Does SA40C-E3/73 have polarity markings on the package?

No, SA40C-E3/73 does not have polarity markings. As a bi-directional TVS diode in DO-204AC (DO-15) package, it is symmetric and unmarked - there is no cathode band or other visual indicator. This design eliminates orientation errors during manual or automated insertion and ensures identical clamping behavior regardless of lead assignment.

What is the maximum clamping voltage of SA40C-E3/73 at rated peak pulse current?

The maximum clamping voltage (V_C) of SA40C-E3/73 is 64.5 V at 7.8 A peak pulse current (I_PPM) under the standard 10/1000 μs waveform. This value is specified in the Electrical Characteristics table (page 2 of datasheet 88378) and represents the upper limit of voltage seen by protected circuitry during worst-case transient events - a critical parameter for ensuring downstream ICs remain within absolute maximum ratings.

Can SA40C-E3/73 be used in automotive applications?

Yes, SA40C-E3/73 is AEC-Q101 qualified, making it suitable for automotive applications including engine control units, body control modules, and ADAS sensor interfaces. Its –55 °C to +175 °C operating junction temperature range, glass-passivated junction, and validation per AEC-Q101 stress tests confirm suitability for under-hood and cabin-mounted electronics - as stated in the Features section and Notes on pages 1 and 3 of the Vishay datasheet.

SA40C-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:: -

Bidirectional Channels:: 1

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)

SA40C-E3/73 FAQ

1.How can I place an order for SA40C-E3/73 through Aetrix?

Please submit a Request for Quotation (RFQ) for SA40C-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 SA40C-E3/73 reliable?

The price and inventory of SA40C-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 SA40C-E3/73 is usually 5 days.

3.What payment methods are accepted for SA40C-E3/73?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40C-E3/73 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SA40C-E3/73?

SA40C-E3/73 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SA40C-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 SA40C-E3/73?

For technical support, including SA40C-E3/73 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40C-E3/73 requirements.

6.How does Aetrix verify that SA40C-E3/73 is sourced from the original manufacturer or authorized distributors?

All SA40C-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 SA40C-E3/73 meets industry standards.

7.What is the process for return or replacement of SA40C-E3/73?

All SA40C-E3/73 units undergo pre-shipment inspection (PSI). If there is an issue with SA40C-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 SA40C-E3/73 part is unused and in its original packaging.

Return procedure for SA40C-E3/73:

1.Submit a request within 90 days.

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

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