SA120A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA120A is a unidirectional Zener-type transient voltage suppressor diode designed for general-purpose overvoltage protection applications. Manufactured by onsemi in DO-15 axial package configuration, this component provides 120V reverse standoff voltage with 193V maximum clamping voltage and 2.7A peak pulse current capability.

The SA120A has reached obsolete product status. Identifying equivalent and substitute parts ensures design continuity and maintains supply chain reliability for applications requiring 120V TVS diode protection.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	120	V
Voltage - Breakdown (Min)	133	V
Voltage - Clamping (Max) @ Ipp	193	V
Current - Peak Pulse (10/1000µs)	2.7	A
Power - Peak Pulse	500	W
Type	Zener	-
Unidirectional Channels	1	-
Mounting Type	Through Hole	-
Package / Case	DO-204AC, DO-15, Axial	-

Substitute Part Grouping Explanation

Substitute parts for the SA120A are qualified based on the following critical parameters:

Voltage - Reverse Standoff (Typ): 120V
Voltage - Breakdown (Min): 133V
Voltage - Clamping (Max) @ Ipp: 193V
Type: Zener, Unidirectional
Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, Axial

Substitute parts maintain identical voltage specifications and package compatibility. Variations in peak pulse current (2.0A to 2.7A) and operating temperature ranges are within acceptable substitution parameters for general-purpose TVS applications. All substitute parts are classified as active products with current manufacturing availability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Product Status	Package
SA120A	onsemi	120V	133V	193V	2.7A	500W	Obsolete	DO-15
SA120A	Taiwan Semiconductor Corporation	120V	133V	193V	2.7A	500W	Active	DO-204AC (DO-15)
SA120A-AP	Micro Commercial Co	120V	133V	193V	2.6A	500W	Active	DO-15
SA120A-BP	Micro Commercial Co	120V	133V	193V	2.6A	500W	Active	DO-15
SA120A-TP	Micro Commercial Co	120V	133V	193V	2.6A	500W	Active	DO-15
P5KE120A-AP	Micro Commercial Co	120V	133V	193V	2.0A	500W	Active	DO-15
P5KE120A-BP	Micro Commercial Co	120V	133V	193V	2.0A	500W	Active	DO-15
P5KE120A-TP	Micro Commercial Co	120V	133V	193V	2.0A	500W	Active	DO-15

Engineering Selection Recommendations

Primary Substitute: SA120A manufactured by Taiwan Semiconductor Corporation provides direct electrical and mechanical equivalence to the obsolete onsemi SA120A. This part maintains identical voltage ratings, peak pulse current (2.7A), and power dissipation specifications. Active product status ensures ongoing availability and supply chain stability.

Secondary Substitutes: SA120A-AP, SA120A-BP, and SA120A-TP from Micro Commercial Co are active alternatives with marginally reduced peak pulse current (2.6A). These parts maintain all critical voltage parameters and package compatibility. Packaging designations (-AP, -BP, -TP) indicate different tape and reel configurations or bulk packaging options.

Alternative Series: P5KE120A-AP, P5KE120A-BP, and P5KE120A-TP from Micro Commercial Co represent an alternative product line with identical voltage specifications but reduced peak pulse current (2.0A). These parts are suitable for applications with lower transient current requirements while maintaining the same clamping voltage performance.

All substitute parts carry REACH Unaffected and EAR99 ECCN classifications, matching the regulatory compliance profile of the original SA120A.

Frequently Asked Questions (FAQ)

Q: Can I substitute the obsolete onsemi SA120A with the Taiwan Semiconductor Corporation SA120A?

A: Yes. Both parts share identical voltage ratings (120V reverse standoff, 193V clamping), peak pulse current (2.7A), and power dissipation (500W). Package compatibility is confirmed for DO-204AC and DO-15 axial configurations. The Taiwan Semiconductor Corporation version maintains active product status.

Q: What is the difference between SA120A and P5KE120A variants?

A: Both product lines maintain identical voltage specifications (120V standoff, 193V clamping). The primary difference is peak pulse current: SA120A variants deliver 2.6A to 2.7A, while P5KE120A variants deliver 2.0A. Selection depends on transient current requirements of the application.

Q: Are the packaging suffixes (-AP, -BP, -TP) electrically significant?

A: No. The suffixes indicate packaging and tape configuration options (bulk, tape and reel variants) from Micro Commercial Co. Electrical specifications remain identical across all three suffix designations for each base part number.

Q: Can I use SA120A-AP with 2.6A peak pulse current in place of the original 2.7A specification?

A: Yes, for general-purpose applications. The 0.1A reduction in peak pulse current remains within acceptable tolerance for transient voltage suppression. Verify application transient current levels do not exceed 2.6A peak pulse rating.

Q: Are all substitute parts compliant with the same regulatory standards?

A: Yes. All substitute parts listed carry REACH Unaffected status and EAR99 ECCN classification, matching the regulatory profile of the original SA120A. Taiwan Semiconductor Corporation SA120A additionally carries RoHS3 Compliance certification.

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