SA8.5-E3/54 Equivalent & Substitute Parts

Part Overview

The SA8.5-E3/54 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 protection in through-hole applications using the DO-204AC (DO-15) axial package format.

The SA8.5-E3/54 is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain electrical compatibility within the specified parameter ranges, ensuring continued design support and supply chain availability.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	8.5V
Voltage - Breakdown (Min)	9.44V
Voltage - Clamping (Max) @ Ipp	15.9V
Current - Peak Pulse (10/1000µs)	31.4A
Power - Peak Pulse	500W
Operating Temperature Range	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution for the SA8.5-E3/54 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 8.5V
Voltage - Breakdown (Min): 9.44V minimum
Voltage - Clamping (Max) @ Ipp: Must not exceed 15.9V
Current - Peak Pulse (10/1000µs): Minimum 31.4A
Power - Peak Pulse: Minimum 500W
Operating Temperature Range: -55°C ~ 175°C
Package / Case: DO-204AC / DO-15 axial through-hole
Type: Zener, Unidirectional

Substitute parts must maintain these electrical and mechanical specifications to ensure functional equivalence in circuit protection applications. All identified substitutes meet or exceed these parameters within the allowed tolerance ranges.

Parameter Comparison

Parameter	SA8.5-E3/54 (Main)	SA8.5A-E3/54	P6KE10A	SA8.5A (TSC)	SA8.5A-AP	SA8.5A-BP	SA8.5A-TP
Manufacturer	Vishay	Vishay	Fairchild	Taiwan Semiconductor	Micro Commercial Co	Micro Commercial Co	Micro Commercial Co
Voltage - Reverse Standoff (Typ)	8.5V	8.5V	8.5V	8.5V	8.5V	8.5V	8.5V
Voltage - Breakdown (Min)	9.44V	9.44V	9.5V	9.44V	9.44V	9.44V	9.44V
Voltage - Clamping (Max) @ Ipp	15.9V	14.4V	14.5V	14.4V	14.4V	14.4V	14.4V
Current - Peak Pulse (10/1000µs)	31.4A	34.7A	43A	36A	35.4A	35.4A	35.4A
Power - Peak Pulse	500W	500W	600W	500W	500W	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	-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	DO-15	DO-15
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Type	Zener	Zener	Zener	Zener	Zener	Zener	Zener
Unidirectional Channels	1	1	1	1	1	1	1

Engineering Selection Recommendations

All substitute parts listed are active products with current manufacturing support. Selection should be based on the following criteria:

Vishay SA8.5A-E3/54: Direct manufacturer successor from Vishay General Semiconductor - Diodes Division. Maintains the same base product number (SA8.5) and TransZorb® series designation. Offers improved clamping voltage performance (14.4V vs. 15.9V) and higher peak pulse current (34.7A vs. 31.4A). Supplied in Tape & Reel packaging. RoHS3 compliant.

Fairchild P6KE10A: Cross-manufacturer alternative with superior peak pulse current rating (43A) and power dissipation (600W). Maintains 8.5V standoff voltage and 14.5V clamping voltage. Operating temperature range extends to -50°C minimum. Supplied in bulk packaging. Suitable for applications requiring higher transient current handling.

Taiwan Semiconductor SA8.5A: Alternative source for SA8.5 base product with active product status. Delivers 36A peak pulse current and 14.4V clamping voltage. Supplied in Tape & Reel packaging. RoHS3 compliant. Provides supply chain diversification.

Micro Commercial Co SA8.5A-AP, SA8.5A-BP, SA8.5A-TP: Functionally equivalent variants with identical electrical specifications (35.4A peak pulse, 14.4V clamping). Differentiated by packaging format (bulk) and supplier device package designation (DO-15). Suitable for high-volume applications requiring bulk supply.

Frequently Asked Questions (FAQ)

Q: Can SA8.5A-E3/54 directly replace SA8.5-E3/54 in existing designs?

A: Yes. SA8.5A-E3/54 is the direct successor from Vishay. It maintains the same 8.5V standoff voltage, 9.44V minimum breakdown voltage, and DO-204AC (DO-15) package. The improved clamping voltage (14.4V vs. 15.9V) and higher peak pulse current (34.7A vs. 31.4A) provide enhanced protection margins without requiring circuit modifications.

Q: What is the difference between SA8.5A variants from Micro Commercial Co (SA8.5A-AP, SA8.5A-BP, SA8.5A-TP)?

A: These variants are electrically identical with 8.5V standoff voltage, 14.4V clamping voltage, and 35.4A peak pulse current. Differences are limited to packaging format (all bulk) and supplier device package designation. Selection depends on procurement and assembly requirements rather than electrical performance.

Q: Is P6KE10A suitable for applications requiring -55°C minimum operating temperature?

A: P6KE10A operates from -50°C to 175°C. If the design requires -55°C minimum temperature operation, use SA8.5A-E3/54, Taiwan Semiconductor SA8.5A, or Micro Commercial Co variants, which all support -55°C to 175°C range.

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters are: 8.5V reverse standoff voltage, 9.44V minimum breakdown voltage, clamping voltage not exceeding 15.9V, peak pulse current minimum 31.4A, and 500W minimum power dissipation. All listed substitutes meet or exceed these specifications. Package type (DO-204AC / DO-15 axial through-hole) and mounting method (through-hole) must also match.

Q: Are all substitute parts RoHS3 compliant?

A: Vishay SA8.5A-E3/54 and Taiwan Semiconductor SA8.5A are explicitly RoHS3 compliant. Fairchild P6KE10A and Micro Commercial Co variants do not list RoHS3 status in provided specifications. Verify RoHS compliance requirements with component suppliers if mandated by application standards.

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