SA26A Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SA26A is an active Littelfuse Inc. Transient Voltage Suppressor (TVS) diode designed for general-purpose voltage transient protection applications. This unidirectional zener-type TVS diode operates through a 26V reverse standoff voltage with a 42.1V maximum clamping voltage and 12.1A peak pulse current capability. The device is packaged in a DO-204AC (DO-15) axial through-hole configuration and is ROHS3 compliant with unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining compatible mechanical packaging and compliance certifications.

Substiute Parts

SA26A

Littelfuse Inc.In Stock: 5792SA26A Datasheet

Current PartRFQ

5KP26A

Littelfuse Inc.In Stock: 46525KP26A Datasheet

MFR RecommendedRFQ

P6KE30A

Taiwan Semiconductor CorporationIn Stock: 25293P6KE30A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA26A are qualified based on the following critical parameters that determine functional equivalence:

• Voltage - Reverse Standoff (Typ): 26V nominal
• Voltage - Clamping (Max) @ Ipp: 42.1V maximum
• Unidirectional zener-type TVS diode configuration
• Through-hole axial package compatibility (DO-204AC or DO-15)
• ROHS3 compliance and unlimited MSL rating
• General-purpose application classification

Parts meeting these criteria can function as direct substitutes in circuits designed for the SA26A, provided the peak pulse current and power dissipation requirements do not exceed the substitute part's ratings.

Parameter Comparison

Engineering Selection Recommendations

5KP26A (Littelfuse Inc.): This part maintains identical voltage specifications (26V reverse standoff, 42.1V clamping) and unidirectional zener configuration as the SA26A. The 5KP26A provides significantly higher peak pulse current (121.1A) and power dissipation (5000W) compared to the SA26A (12.1A, 500W), making it suitable for applications requiring greater transient energy absorption. Both parts are ROHS3 compliant with unlimited MSL ratings and active product status. Package compatibility requires verification: SA26A uses DO-204AC while 5KP26A uses P600 axial packaging. Both are through-hole axial configurations.

P6KE30A (Taiwan Semiconductor Corporation): This part provides closely matched voltage performance with a 25.6V reverse standoff and 41.4V clamping voltage, representing a 0.4V standoff variance and 0.7V clamping variance from the SA26A specifications. Peak pulse current (14.5A) and power dissipation (600W) exceed the SA26A ratings. The P6KE30A is packaged in DO-204AC (DO-15) axial configuration, providing direct mechanical compatibility with the SA26A. ROHS3 compliance and unlimited MSL rating are maintained. Operating temperature range is not specified for the P6KE30A.

Both substitute parts maintain active product status and full compliance certifications. Selection between substitutes depends on application-specific requirements for peak pulse current capacity and mechanical package constraints.

Frequently Asked Questions (FAQ)

Q: Can the 5KP26A directly replace the SA26A in a circuit board layout?

A: Electrical substitution is valid based on voltage specifications. However, mechanical compatibility requires verification. The SA26A uses DO-204AC packaging while the 5KP26A uses P600 packaging. Both are through-hole axial configurations, but physical dimensions and lead spacing may differ. PCB footprint compatibility must be confirmed before substitution.

Q: What is the primary difference between the SA26A and 5KP26A?

A: Both parts share identical voltage ratings (26V standoff, 42.1V clamping). The 5KP26A is rated for significantly higher peak pulse current (121.1A versus 12.1A) and power dissipation (5000W versus 500W). The 5KP26A is suitable for applications requiring greater transient energy absorption capacity.

Q: Is the P6KE30A a direct electrical equivalent to the SA26A?

A: The P6KE30A provides closely matched voltage performance with minor deviations: 25.6V standoff (0.4V lower) and 41.4V clamping (0.7V lower) compared to the SA26A. These variances fall within typical TVS diode tolerance ranges for general-purpose applications. Peak pulse current (14.5A) and power dissipation (600W) exceed SA26A ratings. Direct package compatibility exists as both use DO-204AC (DO-15) axial through-hole configuration.

Q: Are all three parts ROHS3 compliant?

A: Yes. The SA26A, 5KP26A, and P6KE30A are all ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) ratings.

Q: What factors should determine which substitute part to select?

A: Selection criteria include: (1) Peak pulse current requirement—if the application requires current absorption exceeding 12.1A, the 5KP26A (121.1A) or P6KE30A (14.5A) are appropriate; (2) Power dissipation requirement—verify the application's transient energy does not exceed the substitute part's power rating; (3) Mechanical packaging—confirm PCB footprint compatibility with the selected package type; (4) Voltage tolerance—the P6KE30A's 0.4V standoff variance may be acceptable depending on circuit design margins.