SA7.5-E3/73 Equivalent & Substitute Parts

Part Overview

The SA7.5-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 reverse standoff voltage of 7.5V and a maximum clamping voltage of 14.3V at peak pulse current. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar electrical characteristics.

Substiute Parts

SA7.5-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 917SA7.5-E3/73 Datasheet

Current PartRFQ

SA7.5A-E3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 32397SA7.5A-E3/73 Datasheet

DirectRFQ

SA7.5A

Taiwan Semiconductor CorporationIn Stock: 300283SA7.5A Datasheet

MFR RecommendedRFQ

SA7.5A-TP

Micro Commercial CoIn Stock: 804SA7.5A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SA7.5-E3/73 is determined by the following critical electrical and mechanical parameters:

• Reverse Standoff Voltage: 7.5V (all substitutes maintain this specification)
• Voltage - Breakdown (Min): 8.33V (consistent across all alternatives)
• Package / Case: DO-204AC (DO-15), Axial (through-hole mounting requirement)
• Type: Zener, Unidirectional (1 channel)
• Operating Temperature Range: -55°C to 175°C (TJ)
• Power - Peak Pulse: 500W (maintained across all substitutes)

The substitute parts SA7.5A-E3/73, SA7.5A, and SA7.5A-TP meet these core requirements. Variations in clamping voltage (12.9V vs. 14.3V) and peak pulse current (38.8A to 40A vs. 35A) remain within the functional envelope for general-purpose transient suppression applications while maintaining identical standoff and breakdown voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (SA7.5A-E3/73, SA7.5A, and SA7.5A-TP) are active products with current manufacturing status, addressing the obsolescence of the original SA7.5-E3/73. Selection among these alternatives should be based on the following factors:

SA7.5A-E3/73 (Vishay General Semiconductor) maintains direct manufacturer continuity and is ROHS3 compliant. This part offers the closest alignment with the original design lineage while providing improved peak pulse current capability (38.8A vs. 35A).

SA7.5A (Taiwan Semiconductor Corporation) is available in high volume (300,200 pcs) and provides the highest peak pulse current rating (40A). This part is ROHS3 compliant and suitable for applications requiring maximum current handling within the 7.5V standoff voltage class.

SA7.5A-TP (Micro Commercial Co) offers an alternative source with 39.5A peak pulse current capability and is available in bulk packaging. REACH compliance is confirmed; RoHS status is not specified in available documentation.

All substitutes maintain identical reverse standoff voltage (7.5V), breakdown voltage (8.33V), power dissipation (500W), and operating temperature range (-55°C to 175°C). The reduction in clamping voltage from 14.3V to 12.9V across all active substitutes represents an improvement in transient suppression performance.

Frequently Asked Questions (FAQ)

Q: Can SA7.5A-E3/73, SA7.5A, or SA7.5A-TP be used as direct replacements for SA7.5-E3/73?

A: Yes. All three parts maintain the critical electrical specifications: 7.5V reverse standoff voltage, 8.33V minimum breakdown voltage, 500W peak pulse power, and -55°C to 175°C operating temperature range. The DO-204AC (DO-15) axial through-hole package is identical across all parts, enabling direct PCB substitution.

Q: What is the significance of the clamping voltage difference (14.3V vs. 12.9V)?

A: The substitute parts achieve lower clamping voltage (12.9V) while maintaining the same standoff voltage specification. This represents improved transient suppression performance, as the device clamps transient overvoltages to a lower level, providing enhanced circuit protection.

Q: Are all substitute parts RoHS compliant?

A: SA7.5A-E3/73 and SA7.5A are confirmed ROHS3 compliant. SA7.5A-TP RoHS status is not specified in available documentation. All parts are REACH unaffected.

Q: How do the peak pulse current ratings differ among substitutes?

A: SA7.5-E3/73 (original): 35A; SA7.5A-E3/73: 38.8A; SA7.5A: 40A; SA7.5A-TP: 39.5A. All substitutes provide equal or higher peak pulse current capability, supporting applications with equivalent or higher transient current requirements.

Q: What packaging options are available for substitute parts?

A: SA7.5A-E3/73 is supplied in standard packaging (not specified). SA7.5A is available in Tape & Reel (TR) format. SA7.5A-TP is available in bulk packaging. All maintain the DO-204AC (DO-15) axial component form factor for through-hole mounting.

Q: Which substitute part offers the best availability?

A: SA7.5A (Taiwan Semiconductor Corporation) has the highest inventory level at 300,200 pcs. SA7.5A-E3/73 has 32,300 pcs available. SA7.5A-TP has 729 pcs in stock.