SA8.0 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA8.0 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. The device features an 8V reverse standoff voltage with a 14.28V maximum clamping voltage at peak pulse current, housed in a DO-204AC (DO-15) axial through-hole package. The SA8.0 is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Active equivalent models from alternative manufacturers provide identical electrical performance within the specified parameter ranges while maintaining full compatibility with existing circuit designs.

Substiute Parts

SA8.0

Littelfuse Inc.In Stock: 977SA8.0 Datasheet

Current PartRFQ

SA8.0A

Taiwan Semiconductor CorporationIn Stock: 300339SA8.0A Datasheet

DirectRFQ

SA8.0A-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 769SA8.0A-E3/54 Datasheet

MFR RecommendedRFQ

SA8.0A-TP

Micro Commercial CoIn Stock: 1089SA8.0A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA8.0 is determined by strict equivalence across the following critical parameters: reverse standoff voltage (8V nominal), package type (DO-204AC/DO-15 axial through-hole), unidirectional Zener diode topology, and operating temperature range (-55°C to 175°C). The substitute parts listed below maintain these core specifications while operating within acceptable tolerances for clamping voltage (13.6V to 14.28V range) and peak pulse current (36.8A to 38A range). All substitutes are RoHS3 compliant and rated for 500W peak pulse power dissipation. Packaging format variations (Tape & Reel, Cut Tape, Bulk) do not affect electrical equivalence and are determined by procurement requirements rather than functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts (SA8.0A, SA8.0A-E3/54, SA8.0A-TP) are active products with full RoHS3 compliance and REACH unaffected status, providing long-term availability and regulatory compliance advantages over the obsolete SA8.0. The SA8.0A from Taiwan Semiconductor Corporation offers the highest inventory availability (300,300 pcs) and is supplied in Tape & Reel packaging, suitable for automated assembly processes. The SA8.0A-E3/54 from Vishay (TransZorb® series) is manufacturer-recommended and available in Cut Tape format with lower inventory levels (701 pcs), appropriate for lower-volume applications. The SA8.0A-TP from Micro Commercial Co provides bulk packaging with moderate inventory (1,057 pcs) and matches the original peak pulse current specification (37.5A) exactly. Selection should be based on procurement volume requirements, packaging format compatibility with assembly equipment, and supplier lead time considerations.

Frequently Asked Questions (FAQ)

Q: Can SA8.0A substitute directly for SA8.0 in existing designs? A: Yes. The SA8.0A maintains identical reverse standoff voltage (8V), operating temperature range (-55 to 175°C), package type (DO-204AC/DO-15), and power rating (500W). The clamping voltage is 13.6V versus 14.28V on the original, and peak pulse current is 38A versus 37.5A, both within acceptable design tolerances for general-purpose TVS applications.

Q: What is the difference between SA8.0A-E3/54 and SA8.0A? A: Both parts are electrically equivalent with identical voltage and temperature specifications. The primary differences are manufacturer (Vishay versus Taiwan Semiconductor), packaging format (Cut Tape versus Tape & Reel), and inventory availability. The SA8.0A-E3/54 carries Vishay's TransZorb® series designation.

Q: Does packaging format affect electrical performance? A: No. Tape & Reel (TR), Cut Tape (CT), and Bulk packaging formats are procurement and assembly considerations only. All three substitute parts deliver identical electrical performance regardless of packaging format.

Q: Are all substitutes RoHS3 compliant? A: Yes. SA8.0A, SA8.0A-E3/54, and SA8.0A-TP are all RoHS3 compliant. The SA8.0A and SA8.0A-E3/54 are also REACH unaffected.

Q: Which substitute should be selected for new designs? A: For new designs, any of the three active substitutes are acceptable. Selection criteria should include: procurement volume (SA8.0A offers highest availability), packaging compatibility with assembly equipment (Tape & Reel for automated lines, Bulk for manual assembly), and supplier lead time. All three maintain full electrical and thermal equivalence.