SA120 Equivalent & Substitute Parts

Part Overview

The SA120 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in through-hole applications. The device features a 120V reverse standoff voltage with a 202.65V maximum clamping voltage and 2.6A peak pulse current capability in a DO-204AC (DO-15) axial package. The SA120 is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	120V
Voltage - Breakdown (Min)	126V
Voltage - Clamping (Max) @ Ipp	202.65V
Current - Peak Pulse (10/1000µs)	2.6A
Power - Peak Pulse	500W
Package / Case	DO-204AC, DO-15, Axial
Operating Temperature Range	-55°C ~ 175°C (TJ)
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitute parts for the SA120 are qualified based on the following electrical and mechanical parameters:

Voltage - Reverse Standoff: 120V (identical)
Voltage - Clamping (Max) @ Ipp: 193V to 202.65V (acceptable range for transient suppression)
Current - Peak Pulse: 2.0A to 2.7A (within functional tolerance for general-purpose protection)
Package / Case: DO-204AC, DO-15, Axial (mechanical compatibility)
Power - Peak Pulse: 500W (identical)
Type: Zener, Unidirectional (functional equivalence)
Operating Temperature: -55°C to -65°C minimum, 175°C maximum (compatible ranges)

Substitutes are grouped into two categories: direct manufacturer equivalents (SA120A series from Taiwan Semiconductor Corporation and Micro Commercial Co) and alternative voltage-rated suppressors (P5KE120A series from Micro Commercial Co) that meet the same standoff and clamping voltage specifications.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Operating Temperature	Product Status	Inventory
SA120	Littelfuse Inc.	120V	202.65V	2.6A	500W	-55°C ~ 175°C	Obsolete	944 Pcs
SA120A	Taiwan Semiconductor Corporation	120V	193V	2.7A	500W	-55°C ~ 175°C	Active	1073 Pcs
SA120A-AP	Micro Commercial Co	120V	193V	2.6A	500W	-55°C ~ 175°C	Active	961 Pcs
SA120A-BP	Micro Commercial Co	120V	193V	2.6A	500W	-55°C ~ 175°C	Active	1107 Pcs
SA120A-TP	Micro Commercial Co	120V	193V	2.6A	500W	-55°C ~ 175°C	Active	982 Pcs
P5KE120A-AP	Micro Commercial Co	120V	193V	2.0A	500W	-65°C ~ 175°C	Active	905 Pcs
P5KE120A-BP	Micro Commercial Co	120V	193V	2.0A	500W	-65°C ~ 175°C	Active	866 Pcs
P5KE120A-TP	Micro Commercial Co	120V	193V	2.0A	500W	-65°C ~ 175°C	Active	1022 Pcs

Engineering Selection Recommendations

All substitute parts listed are active products with ROHS3 compliance and REACH unaffected status, providing long-term availability and regulatory compliance advantages over the obsolete SA120.

For applications requiring identical peak pulse current specifications (2.6A), select from the SA120A series (Taiwan Semiconductor Corporation or Micro Commercial Co variants SA120A-AP, SA120A-BP, SA120A-TP). These parts maintain the original 2.6A rating while offering improved clamping voltage performance at 193V.

For applications where peak pulse current can be reduced to 2.0A, the P5KE120A series (P5KE120A-AP, P5KE120A-BP, P5KE120A-TP) provides an alternative with extended low-temperature operating range (-65°C minimum versus -55°C).

All substitute parts maintain identical 120V reverse standoff voltage, 500W peak pulse power, and DO-204AC/DO-15 axial package compatibility with the original SA120.

Frequently Asked Questions (FAQ)

Q: Can SA120A series parts directly replace the SA120?

A: Yes. SA120A variants from Taiwan Semiconductor Corporation and Micro Commercial Co maintain the same 120V reverse standoff voltage, 500W peak pulse power, and DO-204AC/DO-15 package. The clamping voltage is 193V versus the original 202.65V, and peak pulse current is 2.6A to 2.7A, all within functional tolerance for general-purpose transient suppression.

Q: What is the difference between SA120A-AP, SA120A-BP, and SA120A-TP?

A: These designations represent different packaging and distribution formats from Micro Commercial Co for the same electrical specification. All three variants are electrically identical with 120V standoff, 193V clamping, 2.6A peak pulse current, and -55°C to 175°C operating temperature. Selection depends on procurement and inventory requirements.

Q: When should P5KE120A series be used instead of SA120A?

A: The P5KE120A series is suitable when the application can tolerate 2.0A peak pulse current (versus 2.6A) and requires extended low-temperature operation to -65°C. All other electrical parameters remain equivalent: 120V standoff, 193V clamping, 500W peak power, and DO-15 package.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with REACH unaffected status, meeting current regulatory requirements for electronic component procurement.

Q: What is the package compatibility between SA120 and substitute parts?

A: All parts use DO-204AC (DO-15) axial through-hole packages with identical mechanical dimensions and pin configuration, enabling direct board-level substitution without layout modifications.

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