SA40C-E3/73 Equivalent & Substitute Parts

Part Overview

The SA40C-E3/73 is a 40V Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, housed in a DO-204AC (DO-15) axial through-hole package. This component is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. The part operates across a temperature range of -55°C to 175°C and provides general-purpose transient voltage suppression with a peak pulse power rating of 500W.

Key Parameters

Parameter	Value
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
Operating Temperature Range	-55°C ~ 175°C (TJ)
Package / Case	DO-204AC, DO-15, Axial
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SA40C-E3/73 is determined by the following critical parameters:

Reverse Standoff Voltage: 40V (nominal)
Breakdown Voltage range: 44.4V minimum
Package configuration: DO-204AC / DO-15 axial through-hole
Bidirectional channel count: 1
Operating temperature range: -55°C to 175°C minimum
Peak pulse power capability: 500W or greater
Zener diode type classification

All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional equivalence in circuit applications designed for the SA40C-E3/73.

Parameter Comparison

Parameter	SA40C-E3/73 (Main)	SA40CA-E3/73	P6KE47CA	SA40CA	SA40CA-TP
Manufacturer	Vishay	Vishay	Diotec	Taiwan Semiconductor	Micro Commercial Co
Product Status	Obsolete	Active	Active	Active	Active
Voltage - Reverse Standoff (Typ)	40V	40V	40.2V	40V	40V
Voltage - Breakdown (Min)	44.4V	44.4V	44.7V	44.4V	44.4V
Voltage - Clamping (Max) @ Ipp	71.4V	64.5V	64.8V	64.5V	64.5V
Current - Peak Pulse (10/1000µs)	7A	7.8A	9.7A	8.1A	7.9A
Power - Peak Pulse	500W	500W	600W	500W	500W
Operating Temperature Range	-55°C ~ 175°C	-55°C ~ 175°C	-50°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Package / Case	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15	DO-15
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

All listed substitute parts maintain active product status, ensuring long-term availability and supply chain stability compared to the obsolete SA40C-E3/73. The SA40CA-E3/73, SA40CA, and SA40CA-TP variants are direct electrical equivalents with identical reverse standoff and breakdown voltage specifications. These parts are ROHS3 compliant and suitable for applications requiring regulatory compliance.

The P6KE47CA from Diotec Semiconductor offers enhanced peak pulse current capability (9.7A versus 7A) and increased peak pulse power (600W versus 500W), providing additional margin in transient suppression applications. This part operates across a slightly reduced minimum temperature range (-50°C versus -55°C), which is acceptable for most general-purpose applications.

For applications requiring exact parameter matching with the original SA40C-E3/73, the SA40CA-E3/73 is the primary recommendation due to its identical electrical specifications and active manufacturing status from Vishay.

Frequently Asked Questions (FAQ)

Q: Can SA40CA-E3/73 directly replace SA40C-E3/73 in existing designs?

A: Yes. The SA40CA-E3/73 maintains identical reverse standoff voltage (40V), breakdown voltage (44.4V minimum), and operating temperature range (-55°C to 175°C). Both are housed in DO-204AC / DO-15 packages and are rated for 500W peak pulse power. The primary difference is product status: SA40CA-E3/73 is active while SA40C-E3/73 is obsolete.

Q: What is the difference between SA40CA-E3/73 and SA40CA?

A: Both parts share identical electrical specifications and are manufactured by Vishay. The primary distinction is packaging: SA40CA-E3/73 is supplied in tape and reel format, while SA40CA is supplied in bulk. Both are suitable for through-hole mounting in DO-204AC / DO-15 packages.

Q: Is P6KE47CA a suitable substitute for SA40C-E3/73?

A: P6KE47CA is electrically compatible with identical reverse standoff voltage (40V nominal) and breakdown voltage (44.7V minimum). However, it exhibits lower clamping voltage (64.8V versus 71.4V) and higher peak pulse current (9.7A versus 7A). The operating temperature minimum is -50°C instead of -55°C. This part is suitable for applications where the lower clamping voltage and higher current capability are acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: SA40CA-E3/73, SA40CA, and P6KE47CA are confirmed ROHS3 compliant. SA40CA-TP compliance status is not specified in available documentation.

Q: What packaging options are available for substitutes?

A: All substitute parts are available in DO-204AC / DO-15 axial through-hole packages. SA40CA-TP is specifically supplied in bulk format, while SA40CA-E3/73 is supplied in tape and reel format. Packaging selection depends on production volume and assembly requirements.

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