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

Vishay General Semiconductor - Diodes Division SA40C-E3/54

Name: SA40C-E3/54
Brand: Vishay General Semiconductor - Diodes Division
SKU: SA40C-E3/54
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SA40C-E3/54

Manufacturer:: Vishay General Semiconductor - Diodes Division

Category:: TVS Diodes

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

Datasheet:: SA40C-E3/54.pdf

Description:: TVS DIODE 40VWM 71.4VC DO204AC

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Product details

Overview

SA40C-E3/54 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 a 40 V stand-off voltage (V_WM), 64.5 V maximum clamping voltage (V_C) at 7.8 A peak pulse current (I_PPM), and 500 W peak pulse power (10/1000 μs waveform), making it suitable for protecting MOSFETs and sensor interfaces in industrial control systems.

For engineers reviewing the SA40C-E3/54 datasheet, SA40C-E3/54 pinout, SA40C-E3/54 application, or SA40C-E3/54 equivalent, key selection criteria include bi-directional clamping capability, AEC-Q101 qualification status, DO-15 mechanical compatibility, and verified 175 °C junction temperature rating under transient stress.

Technical Context

The SA40C-E3/54 operates as a bi-directional avalanche diode with symmetrical breakdown characteristics in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable leakage performance and low incremental surge resistance across temperature.

It delivers 500 W peak pulse power handling per the 10/1000 μs standard waveform, with clamping voltage tightly bounded at ≤64.5 V up to 7.8 A, and exhibits a ±5 % breakdown voltage tolerance (min 44.4 V, max 49.1 V at 1 mA test current). The device is rated for continuous power dissipation of 3.0 W on an infinite heatsink at 75 °C lead temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
V_WM	40 V - Maximum reverse stand-off voltage before significant conduction; defines safe operating window for protected circuitry.
V_BR (min/max)	44.4 V / 49.1 V at 1 mA - Confirmed avalanche breakdown range; ensures predictable turn-on during overvoltage events.
V_C @ I_PPM	64.5 V at 7.8 A - Clamped voltage seen by downstream components during 10/1000 μs transient; limits stress on IC inputs.
P_PPM	500 W - Peak pulse power handling capacity; supports robust protection against lightning-induced surges and inductive switching spikes.
I_PPM	7.8 A - Maximum non-repetitive peak pulse current; determines minimum series impedance required for effective clamping.
T_J max.	175 °C - Maximum junction temperature rating; enables reliable operation in high-ambient industrial environments.
Package	DO-204AC (DO-15) - Standard axial-leaded package with UL 94 V-0 molded epoxy; compatible with through-hole assembly and manual repair.

Pinout & Package

SA40C-E3/54 is a two-terminal bi-directional TVS diode in DO-204AC (DO-15) package. No polarity marking is applied; terminals are interchangeable and function identically in either direction.

Pin/Terminal	Circuit Role	Design Meaning
Anode/Cathode (unmarked)	Bi-directional avalanche junction	Either terminal serves as cathode or anode depending on transient polarity; no DC bias dependency.
Lead 1 / Lead 2	Current path for transient energy diversion	Leads conduct surge current to ground or rail; matte tin plating ensures J-STD-002 solderability and whisker resistance (JESD 201 Class 1A).

Key Features

Feature	Design Value
Bi-directional clamping	Enables protection of AC signals, differential buses, or ungrounded nodes without polarity concerns.
AEC-Q101 qualified	Validated for automotive-grade reliability including temperature cycling, humidity, and surge endurance - applicable to industrial applications requiring similar robustness.
500 W peak pulse power (10/1000 μs)	Supports EN 61000-4-5 Level 3/4 surge immunity compliance when properly laid out with low-inductance grounding.
Glass passivated junction	Ensures stable leakage current (<1.0 μA at V_WM) and consistent breakdown behavior over lifetime and temperature.
DO-204AC mechanical form	Standardized footprint allows drop-in replacement in legacy designs and simplifies inventory management across TVS families.

Applications

Industrial Motor Drives	Automotive Sensor Interfaces
Use Scenario: Protection of gate drivers and feedback signal lines against inductive kickback from IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across motor phase outputs or isolated analog sensor inputs. Use Value: Limits transient voltage to ≤64.5 V during 7.8 A surges, preventing latch-up or oxide damage in 3.3 V/5 V interface ICs.	Use Scenario: ESD and load-dump protection on LIN bus or analog output lines of pressure/temperature sensors in engine control modules. IC Role / Device Role / Timing Role: Bi-directional clamping element connected between signal line and chassis ground. Use Value: Withstands repetitive 10/1000 μs surges up to 500 W while maintaining <1.0 μA leakage at 40 V, preserving sensor accuracy.
Telecom Power Feeds	Consumer Appliance Control Boards
Use Scenario: Surge suppression on -48 V DC power input rails of remote radio units and base station backhaul equipment. IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input before DC/DC converter stage. Use Value: Clamps 10/1000 μs transients to 64.5 V at full rated current, allowing upstream fuse coordination and avoiding converter shutdown.	Use Scenario: Protection of microcontroller GPIOs and relay driver outputs in washing machine or HVAC main control boards. IC Role / Device Role / Timing Role: Secondary-level TVS on low-voltage control signals exposed to relay coil flyback or user interface ESD. Use Value: DO-15 package enables manual rework; 175 °C T_J rating supports operation near heat-generating triacs and transformers.

Industrial Motor Drives

Automotive Sensor Interfaces

Use Scenario: Protection of gate drivers and feedback signal lines against inductive kickback from IGBT/MOSFET switching in variable-frequency drives.

IC Role / Device Role / Timing Role: Transient voltage suppressor placed across motor phase outputs or isolated analog sensor inputs.

Use Value: Limits transient voltage to ≤64.5 V during 7.8 A surges, preventing latch-up or oxide damage in 3.3 V/5 V interface ICs.

Use Scenario: ESD and load-dump protection on LIN bus or analog output lines of pressure/temperature sensors in engine control modules.

IC Role / Device Role / Timing Role: Bi-directional clamping element connected between signal line and chassis ground.

Use Value: Withstands repetitive 10/1000 μs surges up to 500 W while maintaining <1.0 μA leakage at 40 V, preserving sensor accuracy.

Telecom Power Feeds

Consumer Appliance Control Boards

Use Scenario: Surge suppression on -48 V DC power input rails of remote radio units and base station backhaul equipment.

IC Role / Device Role / Timing Role: Primary overvoltage clamp on DC input before DC/DC converter stage.

Use Value: Clamps 10/1000 μs transients to 64.5 V at full rated current, allowing upstream fuse coordination and avoiding converter shutdown.

Use Scenario: Protection of microcontroller GPIOs and relay driver outputs in washing machine or HVAC main control boards.

IC Role / Device Role / Timing Role: Secondary-level TVS on low-voltage control signals exposed to relay coil flyback or user interface ESD.

Use Value: DO-15 package enables manual rework; 175 °C T_J rating supports operation near heat-generating triacs and transformers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMBJ40CA	Same V_WM (40 V) and bi-directional configuration, but in SMB (DO-214AA) surface-mount package; 600 W P_PPM, slightly lower V_C (64.3 V).	Requires PCB redesign for SMT placement; better suited for space-constrained or automated production environments.	Select SMBJ40CA when board real estate is limited and reflow assembly is used; verify thermal relief pad design for 3.0 W steady-state dissipation.
1.5KE40CA	Same V_WM and bi-directionality, but in larger DO-201AD package; identical 500 W P_PPM, higher I_PPM (12.3 A), V_C = 64.5 V.	Higher surge margin due to larger junction area; used where longer-life surge endurance or higher single-event energy is required.	Choose 1.5KE40CA for applications subject to frequent high-energy transients (e.g., outdoor power supplies); note larger footprint and weight.

Compared with SMBJ40CA and 1.5KE40CA, SA40C-E3/54 offers identical clamping performance and AEC-Q101 qualification in a cost-optimized through-hole DO-15 package, balancing ease of prototyping, serviceability, and industrial-grade reliability without SMT infrastructure dependency.

Availability

SA40C-E3/54 is available at Aetrix Electronics and suitable for industrial motor drives, automotive sensor interfaces, telecom power feeds, and consumer appliance control boards requiring stable component supply and long-term obsolescence management.

Supply support for SA40C-E3/54 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 part of Vishay's TRANSZORB® TVS family, engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure modes must be mitigated without compromising signal integrity.

FAQ

What is the polarity configuration of SA40C-E3/54?

The SA40C-E3/54 is a bi-directional TVS diode with no polarity marking on the DO-204AC package. Both terminals are functionally identical, enabling symmetrical clamping of positive and negative transients. This eliminates orientation concerns during through-hole assembly and supports AC-coupled or floating signal line protection without external biasing.

Is SA40C-E3/54 qualified to AEC-Q101?

Yes, SA40C-E3/54 is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 18-Sep-12 (Document Number: 88378). This qualification covers stress tests including temperature cycling, humidity, and surge endurance - validating its suitability for automotive and high-reliability industrial applications where extended lifetime and environmental resilience are critical.

What is the maximum clamping voltage of SA40C-E3/54 under rated surge conditions?

The SA40C-E3/54 has a maximum clamping voltage (V_C) of 64.5 V at 7.8 A peak pulse current (I_PPM) using the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and represents the upper voltage limit imposed on protected circuitry during worst-case transient events, ensuring downstream 5 V or 3.3 V ICs remain within safe operating margins.

Can SA40C-E3/54 replace SA40A-E3/54 in a design?

No - SA40C-E3/54 is bi-directional while SA40A-E3/54 is uni-directional. Substituting them requires verifying circuit topology: SA40C-E3/54 may be used only where bidirectional clamping is needed (e.g., AC lines, differential pairs), whereas SA40A-E3/54 provides forward conduction path and must be oriented with cathode toward protected side. Direct replacement risks improper protection or device failure.

What is the RoHS and material compliance status of SA40C-E3/54?

SA40C-E3/54 is RoHS-compliant per Directive 2011/65/EU, as indicated by the "E3" suffix per Vishay's ordering nomenclature. It uses matte tin-plated leads compliant with J-STD-002 and meets JESD 201 Class 1A whisker resistance. The molding compound is UL 94 V-0 rated, and the device conforms to Vishay's Halogen-Free policy per JEDEC JS709A standards.

SA40C-E3/54 Specifications

Product attributes: Attribute value

Manufacturer:: Vishay General Semiconductor - Diodes Division

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

Series:: TransZorb®

Packaging:: Tape & Reel (TR)

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-E3/54 FAQ

1.How can I place an order for SA40C-E3/54 through Aetrix?

Please submit a Request for Quotation (RFQ) for SA40C-E3/54 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-E3/54 reliable?

The price and inventory of SA40C-E3/54 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SA40C-E3/54 is usually 5 days.

3.What payment methods are accepted for SA40C-E3/54?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SA40C-E3/54 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SA40C-E3/54?

SA40C-E3/54 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SA40C-E3/54 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-E3/54?

For technical support, including SA40C-E3/54 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SA40C-E3/54 requirements.

6.How does Aetrix verify that SA40C-E3/54 is sourced from the original manufacturer or authorized distributors?

All SA40C-E3/54 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-E3/54 meets industry standards.

7.What is the process for return or replacement of SA40C-E3/54?

All SA40C-E3/54 units undergo pre-shipment inspection (PSI). If there is an issue with SA40C-E3/54, 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-E3/54 part is unused and in its original packaging.

Return procedure for SA40C-E3/54:

1.Submit a request within 90 days.

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

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