SA110C Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA110C is a through-hole Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., classified as a Zener-type bidirectional TVS device. This component is designed for general-purpose transient voltage protection applications with a 110V reverse standoff voltage rating and 185.85V maximum clamping voltage. The SA110C is currently listed as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and component procurement.

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)
Type	Zener
Bidirectional Channels	1

Substitute Part Grouping Explanation

Substitution of the SA110C is determined by strict equivalence across the following critical parameters:

Reverse standoff voltage: 110V (nominal)
Package type: DO-204AC (DO-15) through-hole axial configuration
Zener diode type with bidirectional single-channel architecture
Peak pulse current capability: 2.8A to 2.9A
Peak pulse power dissipation: 500W
Operating temperature range: minimum -55°C to 175°C

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in clamping voltage (177V to 185.85V) and breakdown voltage (115.65V to 122V) remain within acceptable tolerance bands for general-purpose transient protection applications. Substitute parts are grouped by manufacturer and product status to facilitate procurement decisions.

Parameter Comparison

Parameter	SA110C (Littelfuse)	SA110CA (Fairchild)	P5KE110CA-TP (MCC)	SA110CA-AP (MCC)	SA110CA-BP (MCC)	SA110CA-TP (MCC)
Voltage - Reverse Standoff (Typ)	110V	110V	110V	110V	110V	110V
Voltage - Breakdown (Min)	115.65V	122V	122V	122V	122V	122V
Voltage - Clamping (Max) @ Ipp	185.85V	177V	177V	177V	177V	177V
Current - Peak Pulse (10/1000µs)	2.9A	2.9A	2.8A	2.9A	2.9A	2.9A
Power - Peak Pulse	500W	500W	500W	500W	500W	500W
Operating Temperature Range	-55°C ~ 175°C	-55°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AC (DO-15)	DO-204AC (DO-15)	DO-15	DO-15	DO-15	DO-15
Type	Zener	Zener	Zener	Zener	Zener	Zener
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For new designs and ongoing procurement, the Micro Commercial Co (MCC) variants—SA110CA-AP, SA110CA-BP, and SA110CA-TP—are preferred due to active product status and confirmed availability. These parts maintain full electrical equivalence to the SA110C while offering superior long-term supply chain stability.

The P5KE110CA-TP variant from MCC provides an extended operating temperature range (-65°C to 175°C) compared to the SA110C (-55°C to 175°C), offering additional thermal margin for applications requiring lower temperature operation. Peak pulse current is rated at 2.8A versus the SA110C's 2.9A, representing a 3.4% reduction that remains within acceptable tolerance for general-purpose transient protection.

The SA110CA from Fairchild Semiconductor is functionally equivalent but shares obsolete status with the original SA110C, limiting its suitability for new procurement strategies.

All substitute parts are RoHS3 compliant or REACH unaffected, maintaining environmental and regulatory compliance equivalent to the original component.

Frequently Asked Questions (FAQ)

Q: Can SA110CA, SA110CA-AP, SA110CA-BP, and SA110CA-TP be used interchangeably with SA110C?

A: Yes. All four parts maintain identical reverse standoff voltage (110V), peak pulse power (500W), and through-hole DO-15 package configuration. Clamping voltage variations (177V to 185.85V) and peak pulse current differences (2.8A to 2.9A) fall within acceptable operating margins for general-purpose transient suppression applications.

Q: What is the difference between SA110CA-AP, SA110CA-BP, and SA110CA-TP?

A: These three parts are electrically identical variants from Micro Commercial Co, differentiated by packaging and distribution channel designations (-AP, -BP, -TP suffixes). All three maintain the same electrical specifications and DO-15 through-hole package. Selection between variants depends on procurement source and inventory availability.

Q: Why does P5KE110CA-TP have a lower peak pulse current rating (2.8A vs 2.9A)?

A: The P5KE110CA-TP is rated at 2.8A peak pulse current compared to the SA110C's 2.9A. This 3.4% difference does not affect functional equivalence for general-purpose transient voltage suppression. The part maintains identical 500W peak pulse power and 110V reverse standoff voltage specifications.

Q: Is the extended temperature range of P5KE110CA-TP (-65°C to 175°C) significant?

A: The P5KE110CA-TP extends the lower operating temperature limit from -55°C to -65°C, providing an additional 10°C of thermal margin. This is beneficial for applications operating in extreme cold environments but is not required for standard industrial temperature ranges.

Q: Are all substitute parts RoHS compliant?

A: Yes. The SA110C is ROHS3 compliant. All Micro Commercial Co variants (SA110CA-AP, SA110CA-BP, SA110CA-TP, P5KE110CA-TP) are REACH unaffected, confirming equivalent environmental compliance status.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from the active Micro Commercial Co variants: SA110CA-AP, SA110CA-BP, or SA110CA-TP. These parts offer confirmed long-term availability and active product status. The P5KE110CA-TP is suitable if extended low-temperature operation (-65°C) is required.

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