SA110A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA110A is a unidirectional Zener-type transient voltage suppressor diode in DO-15 (DO-204AC) axial package configuration. Manufactured by onsemi, this component is designed for general-purpose transient voltage suppression applications with a 110V reverse standoff voltage and 177V maximum clamping voltage. The SA110A is currently classified as obsolete, necessitating identification of active equivalent and substitute parts to maintain design continuity and ensure component availability for new production and field replacements.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	110V
Voltage - Breakdown (Min)	122V
Voltage - Clamping (Max) @ Ipp	177V
Current - Peak Pulse (10/1000µs)	2.8A
Power - Peak Pulse	500W
Type	Zener
Unidirectional Channels	1
Mounting Type	Through Hole
Package / Case	DO-204AC, DO-15, Axial
Applications	General Purpose

Substitute Part Grouping Explanation

Substitution of the SA110A is determined by strict equivalence across the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 110V
Voltage - Breakdown (Min): 122V
Voltage - Clamping (Max) @ Ipp: 177V
Type: Zener, Unidirectional
Mounting Type: Through Hole
Package / Case: DO-204AC or DO-15 axial configuration
Applications: General Purpose

Substitute parts are classified into two categories:

Direct Equivalents maintain identical electrical specifications and peak pulse current ratings (2.8A, 500W).

Similar Equivalents maintain identical voltage parameters and package configuration but differ in peak pulse current capability (28.8A, 5000W for higher-power applications) or manufacturer sourcing while preserving core electrical performance within the specified voltage window.

Parameter Comparison

Part Number	Manufacturer	VWM (Typ)	VBR (Min)	VC (Max)	Ipp (10/1000µs)	Power	Package	Status
SA110A	onsemi	110V	122V	177V	2.8A	500W	DO-15	Obsolete
SA110A-E3/54	Vishay General Semiconductor - Diodes Division	110V	122V	177V	2.8A	500W	DO-204AC (DO-15)	Active
SA110AHE3/54	Vishay General Semiconductor - Diodes Division	110V	122V	177V	2.8A	500W	DO-204AC (DO-15)	Active
5KP110A-B	Littelfuse Inc.	110V	122V	177V	28.8A	5000W	P600	Active
P5KE110A-AP	Micro Commercial Co	110V	122V	177V	2.8A	500W	DO-15	Active
P5KE110A-BP	Micro Commercial Co	110V	122V	177V	2.8A	500W	DO-15	Active
P5KE110A-TP	Micro Commercial Co	110V	122V	177V	2.8A	500W	DO-15	Active
SA110A	Fairchild Semiconductor	110V	122V	177V	2.9A	500W	DO-204AC (DO-15)	Obsolete
SA110A-AP	Micro Commercial Co	110V	122V	177V	2.9A	500W	DO-15	Active
SA110A-BP	Micro Commercial Co	110V	122V	177V	2.9A	500W	DO-15	Active
SA110A-TP	Micro Commercial Co	110V	122V	177V	2.9A	500W	DO-15	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Electrical Equivalents):

SA110A-E3/54 and SA110AHE3/54 from Vishay General Semiconductor - Diodes Division are direct electrical equivalents with identical voltage and power specifications. Both are active products with ROHS3 compliance. SA110AHE3/54 carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability.

P5KE110A-AP, P5KE110A-BP, and P5KE110A-TP from Micro Commercial Co maintain identical electrical specifications (110V standoff, 177V clamping, 2.8A peak pulse, 500W power) and are all active products. These parts are available in bulk packaging and support extended operating temperature range (-65°C to 175°C).

SA110A-AP, SA110A-BP, and SA110A-TP from Micro Commercial Co provide electrical equivalence with marginally higher peak pulse current (2.9A) and are active products with identical package and voltage specifications.

Higher-Power Alternative:

5KP110A-B from Littelfuse Inc. maintains identical voltage parameters but provides significantly higher peak pulse current (28.8A) and power dissipation (5000W) in P600 package. This part is suitable for applications requiring enhanced transient suppression capability beyond the standard 500W specification.

All substitute parts maintain through-hole axial mounting configuration compatible with DO-15 or DO-204AC footprints. Selection should prioritize active product status and compliance certifications appropriate to the application environment.

Frequently Asked Questions (FAQ)

Q: Can SA110A-E3/54 directly replace the obsolete onsemi SA110A?

A: Yes. SA110A-E3/54 from Vishay maintains identical electrical specifications: 110V reverse standoff, 122V minimum breakdown, 177V maximum clamping voltage, 2.8A peak pulse current, and 500W power dissipation. Both use DO-15 (DO-204AC) axial package. The primary difference is product status (active vs. obsolete) and manufacturer sourcing.

Q: What is the difference between the Vishay SA110A-E3/54 and SA110AHE3/54?

A: Both parts are electrically identical with matching voltage and power specifications. SA110AHE3/54 carries AEC-Q101 automotive qualification and is specified for automotive-grade applications. Selection depends on whether automotive reliability certification is required.

Q: Why does 5KP110A-B have different current and power ratings?

A: 5KP110A-B maintains identical voltage parameters (110V standoff, 177V clamping) but uses P600 package instead of DO-15, enabling higher peak pulse current (28.8A) and power dissipation (5000W). This part is suitable for higher-energy transient suppression applications. Footprint compatibility must be verified before substitution.

Q: Are the Micro Commercial Co variants (P5KE110A and SA110A series) interchangeable?

A: P5KE110A-AP, P5KE110A-BP, P5KE110A-TP, SA110A-AP, SA110A-BP, and SA110A-TP all maintain the required 110V/177V voltage specifications and DO-15 package. Differences exist in peak pulse current (2.8A vs. 2.9A) and operating temperature range. All are active products suitable for general-purpose transient suppression.

Q: What packaging differences exist among substitute parts?

A: Most substitutes use DO-15 or DO-204AC axial package, maintaining footprint compatibility with the original SA110A. The exception is 5KP110A-B, which uses P600 package. Verify PCB footprint compatibility before selecting this higher-power alternative.

Q: Which substitute offers the best compliance for new designs?

A: SA110A-E3/54 and SA110AHE3/54 from Vishay are ROHS3 compliant active products. SA110AHE3/54 additionally carries AEC-Q101 automotive qualification. Micro Commercial Co variants (P5KE110A and SA110A series) are active with REACH compliance. Selection should align with specific application compliance requirements.

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