SA110-B Equivalent & Substitute Parts

Part Overview

The SA110-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for transient overvoltage protection in telecom applications. This component features a 110V reverse standoff voltage with a 177V maximum clamping voltage and 2.9A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package.

The SA110-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance and repairs.

Substiute Parts

SA110-B

Littelfuse Inc.In Stock: 1066SA110-B Datasheet

Current PartRFQ

SA110A

Fairchild SemiconductorIn Stock: 3908SA110A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SA110-B is determined by electrical and mechanical parameter equivalence. The following criteria establish valid substitution:

Electrical Parameters (Critical):

• Voltage - Reverse Standoff (Typ): 110V
• Voltage - Breakdown (Min): 122V
• Voltage - Clamping (Max) @ Ipp: 177V
• Current - Peak Pulse (10/1000µs): 2.9A
• Power - Peak Pulse: 500W
• Type: Zener
• Unidirectional Channels: 1

Mechanical Parameters (Critical):

• Mounting Type: Through Hole
• Package / Case: DO-204AC (DO-15) Axial

Environmental Parameters:

• Operating Temperature Range: -65°C to 175°C (TJ)

The SA110A meets all electrical and mechanical parameter requirements for direct substitution with the SA110-B. Both components are classified as obsolete and share identical voltage ratings, current specifications, power dissipation, package configuration, and temperature operating range.

Parameter Comparison

Engineering Selection Recommendations

The SA110A (Fairchild Semiconductor) is a direct electrical and mechanical equivalent to the SA110-B. Both components are obsolete products with identical voltage ratings, current specifications, power dissipation capabilities, and package configurations.

Compliance Considerations:

Both the SA110-B and SA110A are RoHS compliant. The SA110-B carries RoHS Compliant certification, while the SA110A carries ROHS3 Compliant certification, indicating both meet current environmental and hazardous substance restrictions.

Temperature Operating Range:

The SA110-B operates from -65°C to 175°C (TJ), while the SA110A operates from -55°C to 175°C (TJ). The SA110-B provides a lower minimum operating temperature specification. Applications requiring operation below -55°C must use the SA110-B. For applications within the -55°C to 175°C range, the SA110A is suitable.

Inventory and Availability:

The SA110A is available in higher inventory (3,863 pcs) compared to the SA110-B (1,039 pcs), supporting supply chain continuity for legacy system support and repairs.

Frequently Asked Questions (FAQ)

Q: Can the SA110A replace the SA110-B in all applications?

A: The SA110A is electrically and mechanically equivalent to the SA110-B for applications operating within the -55°C to 175°C temperature range. Applications requiring operation below -55°C must use the SA110-B due to its extended lower temperature specification of -65°C.

Q: Are the packages identical between SA110-B and SA110A?

A: Yes. Both components use the DO-204AC (DO-15) axial through-hole package. No PCB layout or mechanical modifications are required for substitution within the specified temperature operating range.

Q: What are the critical electrical parameters for substitution?

A: The critical electrical parameters are: 110V reverse standoff voltage, 122V minimum breakdown voltage, 177V maximum clamping voltage, 2.9A peak pulse current, and 500W peak pulse power. Both the SA110-B and SA110A meet these specifications identically.

Q: Do both parts meet RoHS requirements?

A: Yes. The SA110-B is RoHS Compliant, and the SA110A is ROHS3 Compliant. Both meet current environmental and hazardous substance restrictions for electronic components.

Q: Why are both parts classified as obsolete?

A: Both the SA110-B and SA110A are obsolete products. Identifying equivalent substitutes is necessary for maintaining legacy systems and ensuring continued availability for repair and replacement applications.

Q: What is the difference in minimum operating temperature between these parts?

A: The SA110-B operates from -65°C minimum, while the SA110A operates from -55°C minimum. Both reach 175°C maximum. For applications requiring operation below -55°C, the SA110-B is required.