SA40A-E3/73 Equivalent & Substitute Parts

Part Overview

The SA40A-E3/73 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component operates as a Zener-type TVS device in the TransZorb® series, designed for general-purpose transient voltage protection applications. The device is currently in active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

TVS diodes like the SA40A-E3/73 are essential in circuit protection where transient voltage events must be suppressed to prevent damage to sensitive downstream components. Equivalent and substitute parts are identified when they maintain identical or functionally compatible electrical and mechanical parameters within the specified operating range.

Substiute Parts

SA40A-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 32324SA40A-E3/73 Datasheet

Current PartRFQ

SA40A

Taiwan Semiconductor CorporationIn Stock: 1177SA40A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SA40A-E3/73 is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 40V
• Voltage - Breakdown (Min): 44.4V
• Voltage - Clamping (Max) @ Ipp: 64.5V
• Package / Case: DO-204AC (DO-15), Axial
• Mounting Type: Through Hole
• Unidirectional Channels: 1
• Type: Zener

The SA40A manufactured by Taiwan Semiconductor Corporation meets all substitution criteria. While the peak pulse current specification differs slightly (8.1A versus 7.8A), this represents an increase in capability and does not compromise compatibility. The voltage parameters, package configuration, and thermal operating range remain identical, ensuring functional equivalence in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

The SA40A manufactured by Taiwan Semiconductor Corporation is a direct substitute for the SA40A-E3/73. Both components maintain identical voltage specifications, thermal operating range, and package configuration. Both devices carry ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for industrial and commercial applications.

The Taiwan Semiconductor variant offers a marginal increase in peak pulse current capability (8.1A versus 7.8A), which provides additional design margin without introducing any compatibility concerns. The identical 500W peak pulse power rating and DO-204AC through-hole package ensure seamless integration into existing circuit designs.

Selection between these parts should be based on availability, lead time, and supply chain requirements, as both components are functionally equivalent for general-purpose transient voltage suppression applications.

Frequently Asked Questions (FAQ)

Q: Can the SA40A (Taiwan Semiconductor) be used as a direct replacement for the SA40A-E3/73 (Vishay)?

A: Yes. Both components share identical voltage specifications (40V standoff, 44.4V breakdown minimum, 64.5V clamping maximum), operating temperature range (-55 to 175°C), and DO-204AC through-hole package configuration. The Taiwan Semiconductor variant has a slightly higher peak pulse current rating (8.1A versus 7.8A), which is compatible with the original design.

Q: Are there any package or mounting differences between these parts?

A: No. Both the SA40A-E3/73 and SA40A use the DO-204AC (DO-15) axial through-hole package. They are mechanically and electrically interchangeable in PCB layouts designed for this package type.

Q: Do both parts meet the same regulatory and compliance standards?

A: Yes. Both components are ROHS3 compliant and REACH unaffected. They carry identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: What is the significance of the peak pulse current difference (7.8A versus 8.1A)?

A: The Taiwan Semiconductor SA40A has a higher peak pulse current capability. This represents an improvement in transient handling capacity and does not create any compatibility issues. The component will perform the same protective function with additional margin.

Q: Are these parts suitable for power line protection applications?

A: No. Both the SA40A-E3/73 and SA40A are designated for general-purpose applications and do not carry power line protection ratings. They are intended for transient suppression in signal and low-power circuits.