SA40-E3/73 Equivalent & Substitute Parts

Part Overview

The SA40-E3/73 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, part of the TransZorb® series. This component is designed for general-purpose transient voltage suppression applications with a 40V reverse standoff voltage rating and through-hole DO-204AC (DO-15) axial packaging. The SA40-E3/73 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, current handling, and thermal specifications while supporting the same through-hole mounting configuration.

Substiute Parts

SA40-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 1114SA40-E3/73 Datasheet

Current PartRFQ

SA40A-E3/73

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

DirectRFQ

SA40A

Taiwan Semiconductor CorporationIn Stock: 1177SA40A Datasheet

MFR RecommendedRFQ

SA40A-TP

Micro Commercial CoIn Stock: 868SA40A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA40-E3/73 are qualified based on the following electrical and mechanical parameters:

• Reverse standoff voltage: 40V (identical)
• Breakdown voltage minimum: 44.4V (identical)
• Package type: DO-204AC / DO-15 axial through-hole (identical)
• Operating temperature range: -55°C ~ 175°C (identical)
• Peak pulse power rating: 500W (identical)
• Unidirectional configuration with single channel (identical)

Acceptable variations within substitute parts include clamping voltage (64.5V to 71.4V range) and peak pulse current (7A to 8.1A range), provided these variations remain within the electrical stress limits of the application circuit. All substitute parts maintain RoHS3 compliance and REACH unaffected status.

Parameter Comparison

Engineering Selection Recommendations

The SA40-E3/73 is obsolete and requires substitution for new production. All three substitute parts—SA40A-E3/73, SA40A, and SA40A-TP—maintain active product status and full RoHS3 compliance.

SA40A-E3/73 (Vishay) is the direct manufacturer equivalent, offering the same Vishay TransZorb® series lineage with reduced clamping voltage (64.5V vs. 71.4V) and increased peak pulse current capability (7.8A vs. 7A). This part is recommended for designs requiring continuity with the original manufacturer's product line.

SA40A (Taiwan Semiconductor Corporation) provides an alternative from a different manufacturer with comparable electrical performance (64.5V clamping, 8.1A peak pulse current) and maintains identical package and thermal specifications. This option offers broader supply availability.

SA40A-TP (Micro Commercial Co) delivers equivalent electrical performance (64.5V clamping, 7.9A peak pulse current) with active product status. Packaging is specified as DO-15 bulk format, suitable for applications where tape and reel or alternative packaging is not required.

All substitute parts are qualified for general-purpose transient voltage suppression applications within the specified electrical and thermal operating ranges.

Frequently Asked Questions (FAQ)

Q: Can SA40A-E3/73 directly replace SA40-E3/73 in existing designs?

A: Yes. Both parts share identical reverse standoff voltage (40V), breakdown voltage (44.4V), operating temperature range (-55°C ~ 175°C), and DO-204AC through-hole package. The SA40A-E3/73 exhibits lower clamping voltage (64.5V vs. 71.4V) and higher peak pulse current (7.8A vs. 7A), making it suitable for applications where these parameter variations are acceptable.

Q: What is the difference between SA40A and SA40A-E3/73?

A: Both parts share identical electrical specifications (40V standoff, 44.4V breakdown, 64.5V clamping). The primary difference is manufacturer: SA40A-E3/73 is manufactured by Vishay, while SA40A is manufactured by Taiwan Semiconductor Corporation. Both maintain the same DO-204AC package and thermal range.

Q: Is SA40A-TP compatible with the original SA40-E3/73 footprint?

A: Yes. SA40A-TP uses the DO-15 axial through-hole package, which is mechanically and electrically compatible with the original DO-204AC package. Both are axial through-hole configurations suitable for the same PCB mounting holes.

Q: What are the key electrical differences between substitute parts?

A: All substitute parts maintain the 40V reverse standoff and 44.4V breakdown specifications. Clamping voltage is standardized at 64.5V across all substitutes (lower than the original 71.4V). Peak pulse current varies slightly: SA40A-E3/73 at 7.8A, SA40A at 8.1A, and SA40A-TP at 7.9A. These variations remain within the 500W peak pulse power envelope.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. SA40A-E3/73, SA40A, and SA40A-TP are all RoHS3 compliant with REACH unaffected status, matching the compliance profile of the original SA40-E3/73.