SA8.0HE3/73 Equivalent & Substitute Parts

Part Overview

The SA8.0HE3/73 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 transient overvoltage protection in electronic circuits with an 8V reverse standoff voltage and 15V maximum clamping voltage. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	8V
Voltage - Breakdown (Min)	8.89V
Voltage - Clamping (Max) @ Ipp	15V
Current - Peak Pulse (10/1000µs)	33.3A
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 SA8.0HE3/73 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 8V nominal
Voltage - Breakdown (Min): 8.89V minimum
Voltage - Clamping (Max) @ Ipp: 15V maximum
Current - Peak Pulse (10/1000µs): 33.3A minimum
Power - Peak Pulse: 500W minimum
Operating Temperature Range: -55°C ~ 175°C
Mounting Type: Through Hole
Package / Case: DO-204AC or DO-15 compatible
Type: Zener diode, unidirectional

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents: Parts from Vishay with identical base product number (SA8.0) that maintain the same electrical characteristics and automotive-grade qualification (AEC-Q101).

Cross-Manufacturer Alternatives: Parts from Taiwan Semiconductor Corporation, Fairchild Semiconductor, Diotec Semiconductor, and Micro Commercial Co that meet or exceed the electrical performance requirements within the specified parameter ranges.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package	Product Status
SA8.0HE3/73	Vishay	8V	8.89V	15V	33.3A	500W	-55°C ~ 175°C	DO-204AC	Obsolete
SA8.0AHE3/73	Vishay	8V	8.89V	13.6V	36.8A	500W	-55°C ~ 175°C	DO-204AC	Active
SA8.0A	Taiwan Semiconductor Corporation	8V	8.89V	13.6V	38A	500W	-55°C ~ 175°C	DO-204AC	Active
SA8.0A-AP	Micro Commercial Co	8V	8.89V	13.6V	37.5A	500W	-55°C ~ 175°C	DO-15	Active
SA8.0A-BP	Micro Commercial Co	8V	8.89V	13.6V	37.5A	500W	-55°C ~ 175°C	DO-15	Active
SA8.0A-TP	Micro Commercial Co	8V	8.89V	13.6V	37.5A	500W	-55°C ~ 175°C	DO-15	Active
P6KE11A	Taiwan Semiconductor Corporation	9.4V	10.5V	15.6V	38A	600W	Not specified	DO-15	Active
P6KE12A	Fairchild Semiconductor	10.2V	11.4V	16.7V	37A	600W	-50°C ~ 175°C	DO-15	Active
P6KE13A	Diotec Semiconductor	11.1V	12.4V	18.2V	34A	600W	-50°C ~ 175°C	DO-15	Active
SA10A	Taiwan Semiconductor Corporation	10V	11.1V	17V	30A	500W	-55°C ~ 175°C	DO-204AC	Active
SA11A	Taiwan Semiconductor Corporation	11V	12.2V	18.2V	28A	500W	-55°C ~ 175°C	DO-204AC	Active

Engineering Selection Recommendations

Preferred Direct Substitutes:

SA8.0AHE3/73 and SA8.0A are the primary substitutes for SA8.0HE3/73. Both maintain the 8V reverse standoff voltage and 8.89V minimum breakdown voltage. SA8.0AHE3/73 is manufactured by Vishay and retains AEC-Q101 automotive qualification. SA8.0A from Taiwan Semiconductor Corporation is actively produced with higher peak pulse current (38A vs 33.3A) and equivalent power rating. Both are ROHS3 compliant and suitable for direct replacement in existing designs.

Secondary Substitutes (Micro Commercial Co variants):

SA8.0A-AP, SA8.0A-BP, and SA8.0A-TP are functionally equivalent to SA8.0A with identical electrical parameters. These parts differ only in packaging designation (AP, BP, TP suffixes) and are available in active production status. All three maintain the 8V standoff voltage and 13.6V clamping voltage with 37.5A peak pulse current.

Higher Voltage Alternatives:

P6KE11A, P6KE12A, and P6KE13A are cross-manufacturer alternatives with higher reverse standoff voltages (9.4V, 10.2V, and 11.1V respectively). These parts are suitable only when circuit design permits higher voltage thresholds. P6KE11A and P6KE12A offer increased power dissipation (600W vs 500W). These alternatives are not direct replacements but may be used in applications where higher clamping voltages are acceptable.

Not Recommended:

SA10A and SA11A have reverse standoff voltages of 10V and 11V respectively, exceeding the 8V specification of the original part. These are suitable only for circuits designed for higher voltage protection thresholds.

Frequently Asked Questions (FAQ)

Q: Can SA8.0AHE3/73 be used as a direct replacement for SA8.0HE3/73?

A: Yes. SA8.0AHE3/73 maintains identical reverse standoff voltage (8V), breakdown voltage (8.89V), and operating temperature range (-55°C ~ 175°C). The clamping voltage is lower (13.6V vs 15V), and peak pulse current is higher (36.8A vs 33.3A), making it suitable for direct substitution. AEC-Q101 qualification is retained.

Q: What is the difference between SA8.0A variants from Micro Commercial Co (AP, BP, TP)?

A: SA8.0A-AP, SA8.0A-BP, and SA8.0A-TP are electrically identical with the same 8V standoff voltage, 13.6V clamping voltage, and 37.5A peak pulse current. The suffix designations indicate different packaging or supplier configurations. All three are suitable replacements for SA8.0HE3/73 in applications where the lower clamping voltage is acceptable.

Q: Can P6KE series parts replace SA8.0HE3/73?

A: P6KE series parts have higher reverse standoff voltages (9.4V to 11.1V) than the original 8V specification. These are not direct replacements but may be used in circuit designs that tolerate higher voltage thresholds. Verify circuit requirements before substitution.

Q: What is the significance of the DO-204AC and DO-15 package designations?

A: DO-204AC and DO-15 are equivalent axial through-hole package designations for this diode category. Parts specified as DO-204AC or DO-15 are mechanically and electrically compatible for board-level substitution.

Q: Is automotive qualification (AEC-Q101) required for my application?

A: AEC-Q101 qualification is present in SA8.0HE3/73 and SA8.0AHE3/73 from Vishay. If automotive-grade qualification is mandatory for your application, these Vishay parts are required. Taiwan Semiconductor Corporation and other cross-manufacturer alternatives may not carry this certification.

Q: What is the impact of using a substitute with higher peak pulse current?

A: Substitutes with higher peak pulse current (36.8A to 38A vs 33.3A) provide improved transient suppression capability without negative effects on the circuit. This represents enhanced performance and is acceptable for direct replacement.

Q: Are all substitute parts ROHS3 compliant?

A: SA8.0AHE3/73, SA8.0A, and P6KE13A are explicitly ROHS3 compliant. Compliance status for other alternatives should be verified with the respective manufacturer datasheets.

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