SA26-B Equivalent & Substitute Parts

Part Overview

The SA26-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 26V reverse standoff voltage with a 42.1V maximum clamping voltage and 12.1A peak pulse current capability in a through-hole DO-204AC (DO-15) axial package. The SA26-B is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance, repairs, and legacy design support where original components are no longer readily available or where active product alternatives are preferred.

Substiute Parts

SA26-B

Littelfuse Inc.In Stock: 1213SA26-B Datasheet

Current PartRFQ

SA26A

Fairchild SemiconductorIn Stock: 5783SA26A Datasheet

DirectRFQ

SA26A-B

Littelfuse Inc.In Stock: 687SA26A-B Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes is determined by electrical parameter equivalence and mechanical compatibility. The SA26-B can be substituted with alternative parts that maintain identical or compatible specifications across the following critical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 26V
• Voltage - Breakdown (Min): 28.9V
• Voltage - Clamping (Max) @ Ipp: 42.1V
• Current - Peak Pulse (10/1000µs): 12.1A
• Power - Peak Pulse: 500W
• Type: Zener, Unidirectional (1 channel)

Mechanical Compatibility Criteria:

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

Parts meeting these electrical and mechanical specifications are functionally equivalent and can be used as direct replacements in the same circuit application without design modification.

Parameter Comparison

Engineering Selection Recommendations

SA26A (Fairchild Semiconductor): This substitute part is electrically and mechanically identical to the SA26-B across all critical parameters. However, SA26A is classified as obsolete, similar to the main part. This option is suitable only when existing inventory is available and obsolete component sourcing is acceptable. ROHS3 compliance provides regulatory alignment with current environmental standards.

SA26A-B (Littelfuse Inc.): This substitute part is the preferred selection for new designs and ongoing production requirements. SA26A-B maintains complete electrical and mechanical equivalence to SA26-B while offering the advantage of active product status, ensuring continued availability and manufacturer support. The component is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The operating temperature range of -55°C to 175°C is suitable for the majority of industrial and telecom applications, with the exception of systems requiring the extended lower temperature range of -65°C provided by the SA26-B. Bulk packaging availability supports production environments.

For legacy system repairs where the original SA26-B is specified, SA26A-B provides direct functional replacement with superior long-term availability and compliance status.

Frequently Asked Questions (FAQ)

Q: Can SA26A or SA26A-B be used as direct replacements for SA26-B in existing designs?

A: Yes. Both substitute parts maintain identical electrical parameters (26V standoff, 42.1V clamping, 12.1A peak pulse current, 500W peak power) and are packaged in the same DO-204AC (DO-15) through-hole axial format. Direct substitution is possible without circuit modification.

Q: What is the difference between SA26A and SA26A-B?

A: The primary difference is product status. SA26A is obsolete, while SA26A-B is active. Both are electrically and mechanically equivalent. SA26A-B is recommended for new applications and ongoing production due to continued manufacturer support and availability.

Q: Does the operating temperature range difference between SA26-B (-65°C to 175°C) and the substitutes (-55°C to 175°C) affect compatibility?

A: The substitutes have a narrower lower temperature limit of -55°C compared to SA26-B's -65°C. For applications operating below -55°C, the original SA26-B specification must be maintained. For applications within the -55°C to 175°C range, substitutes are fully compatible.

Q: Are there any compliance or regulatory differences between these parts?

A: SA26-B is RoHS Compliant. Both SA26A and SA26A-B are ROHS3 Compliant, representing a more current regulatory standard. SA26A-B additionally carries REACH Unaffected status. All three parts share the same ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Q: What packaging options are available for the substitutes?

A: SA26A is available in standard packaging. SA26A-B is available in bulk packaging, which is suitable for production environments and high-volume applications.

Q: Can these parts be used interchangeably in telecom applications?

A: SA26-B is specified for telecom applications. SA26A and SA26A-B are specified for general purpose applications. However, the electrical and mechanical specifications are identical, making them functionally suitable for the same telecom protection circuits. Application-specific validation is the responsibility of the system designer.