SA110 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SA110 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. Housed in a DO-204AC (DO-15) axial through-hole package, this component operates across a temperature range of -55°C to 175°C and provides 500W peak pulse power dissipation capability.

The SA110 is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain electrical and mechanical compatibility, enabling continued system design and maintenance without functional compromise.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	110V
Voltage - Breakdown (Min)	115.65V
Voltage - Clamping (Max) @ Ipp	185.85V
Current - Peak Pulse (10/1000µs)	2.9A
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 eligibility for the SA110 is determined by strict alignment across the following critical parameters:

Electrical Compatibility Requirements:

Voltage - Reverse Standoff (Typ): 110V
Voltage - Clamping (Max) @ Ipp: 177V to 185.85V range
Current - Peak Pulse (10/1000µs): 2.8A to 2.9A
Power - Peak Pulse: 500W
Type: Zener
Unidirectional Channels: 1
Applications: General Purpose

Mechanical Compatibility Requirements:

Mounting Type: Through Hole
Package / Case: DO-204AC, DO-15, Axial

All substitute parts listed maintain these electrical and mechanical parameters within the specified tolerances. Substitute parts are grouped by manufacturer and packaging designation while preserving functional equivalence.

Parameter Comparison

Part Number	Manufacturer	Status	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package
SA110	Littelfuse Inc.	Obsolete	110V	115.65V	185.85V	2.9A	500W	-55°C ~ 175°C	DO-204AC (DO-15)
SA110A	Fairchild Semiconductor	Obsolete	110V	122V	177V	2.9A	500W	-55°C ~ 175°C	DO-204AC (DO-15)
P5KE110A-AP	Micro Commercial Co	Active	110V	122V	177V	2.8A	500W	-65°C ~ 175°C	DO-15
P5KE110A-BP	Micro Commercial Co	Active	110V	122V	177V	2.8A	500W	-65°C ~ 175°C	DO-15
P5KE110A-TP	Micro Commercial Co	Active	110V	122V	177V	2.8A	500W	-65°C ~ 175°C	DO-15
SA110A-AP	Micro Commercial Co	Active	110V	122V	177V	2.9A	500W	-55°C ~ 175°C	DO-15
SA110A-BP	Micro Commercial Co	Active	110V	122V	177V	2.9A	500W	-55°C ~ 175°C	DO-15
SA110A-TP	Micro Commercial Co	Active	110V	122V	177V	2.9A	500W	-55°C ~ 175°C	DO-15

Engineering Selection Recommendations

Active Product Availability: The P5KE110A series (P5KE110A-AP, P5KE110A-BP, P5KE110A-TP) and SA110A series (SA110A-AP, SA110A-BP, SA110A-TP) from Micro Commercial Co are classified as active products, ensuring ongoing supply chain availability and manufacturing support.

Compliance Status: All substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original SA110 component. ECCN and HTSUS classifications remain unchanged across all equivalents.

Temperature Operating Range: The P5KE110A series extends the lower operating temperature limit to -65°C compared to the SA110's -55°C minimum. The SA110A series maintains the original -55°C to 175°C range. Selection should align with application thermal requirements.

Peak Pulse Current: The SA110A variants (SA110A-AP, SA110A-BP, SA110A-TP) maintain the original 2.9A peak pulse current specification. The P5KE110A series operates at 2.8A, representing a 3.4% reduction in peak pulse current capacity. This difference remains within the functional envelope for general-purpose transient suppression applications.

Frequently Asked Questions (FAQ)

Q: Can P5KE110A parts directly replace SA110 components? A: Yes. The P5KE110A series maintains electrical compatibility across all critical parameters: 110V reverse standoff voltage, 177V clamping voltage, 500W peak pulse power, and DO-15 axial through-hole packaging. The 2.8A peak pulse current represents a minor reduction from the original 2.9A specification but remains functionally equivalent for general-purpose applications.

Q: What is the difference between SA110A and P5KE110A substitutes? A: Both series are electrically compatible with the original SA110. The SA110A variants maintain the original 2.9A peak pulse current and -55°C lower temperature limit. The P5KE110A variants provide extended temperature operation to -65°C but operate at 2.8A peak pulse current. Selection depends on specific thermal and current requirements.

Q: Are the packaging designations (-AP, -BP, -TP) functionally different? A: The packaging designations indicate different tape and reel configurations for automated assembly. All variants within a series (P5KE110A or SA110A) are electrically and mechanically identical. Selection should be based on procurement and assembly process requirements.

Q: Is the SA110A from Fairchild Semiconductor still available? A: The SA110A from Fairchild Semiconductor is classified as obsolete. Active alternatives are available from Micro Commercial Co under the P5KE110A and SA110A series designations.

Q: Can these parts be used in new designs? A: The P5KE110A and SA110A series from Micro Commercial Co are active products suitable for new design implementations. The original SA110 and Fairchild SA110A are obsolete and should not be specified for new designs.

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