Littelfuse 20KPA26C Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The Littelfuse 20KPA26C is a bidirectional Zener-type transient voltage suppressor diode designed for general-purpose overvoltage protection applications. This through-hole component features a 26V reverse standoff voltage with a 46.94V maximum clamping voltage and 451.9A peak pulse current capability. The 20KPA26C is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement continuity.

Substiute Parts

20KPA26C

Littelfuse Inc.In Stock: 89320KPA26C Datasheet

Current PartRFQ

20KPA26CA

MDE Semiconductor IncIn Stock: 166620KPA26CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 20KPA26C is determined by the following critical parameters:

• Reverse Standoff Voltage: Must match 26V (Typ)
• Peak Pulse Current: Must match 451.9A (10/1000µs)
• Peak Pulse Power: Must match 20000W
• Package Type: Must be P600, Axial through-hole configuration
• Bidirectional Channels: Must be 1
• Clamping Voltage: Acceptable range is 44.7V to 46.94V maximum @ Ipp
• Operating Temperature Range: Must support -55°C to 175°C (TJ)
• RoHS Compliance: Must maintain ROHS3 Compliant status

The 20KPA26CA meets all substitution criteria, with the primary difference being a slightly lower maximum clamping voltage (44.7V vs. 46.94V), which remains within acceptable operating parameters for general-purpose transient suppression applications.

Parameter Comparison

Engineering Selection Recommendations

The 20KPA26CA is a direct functional substitute for the obsolete 20KPA26C. Both components maintain identical reverse standoff voltage, peak pulse current, peak pulse power, operating temperature range, and package configuration. The 20KPA26CA offers the advantage of active product status, ensuring continued availability and supply chain reliability.

The 20KPA26CA exhibits a lower maximum clamping voltage (44.7V versus 46.94V), which represents improved clamping performance and provides additional margin for transient suppression in general-purpose applications. Both components maintain ROHS3 compliance and are suitable for direct board-level substitution without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the 20KPA26CA be used as a direct replacement for the 20KPA26C?

A: Yes. Both components share identical reverse standoff voltage (26V), peak pulse current (451.9A), peak pulse power (20000W), operating temperature range (-55°C to 175°C), and P600 axial through-hole package configuration. The 20KPA26CA is electrically and mechanically compatible for direct substitution.

Q: What is the significance of the different clamping voltages?

A: The 20KPA26CA has a maximum clamping voltage of 44.7V compared to the 20KPA26C at 46.94V. A lower clamping voltage indicates more aggressive transient suppression, which is beneficial for protecting sensitive downstream components. This difference does not prevent substitution in general-purpose applications.

Q: Are there any compliance or certification differences?

A: Both the 20KPA26C and 20KPA26CA maintain ROHS3 compliance. The 20KPA26CA additionally specifies REACH Unaffected status and MSL 1 (Unlimited) moisture sensitivity level, indicating enhanced environmental compliance and handling flexibility.

Q: Why is the 20KPA26C listed as obsolete?

A: The 20KPA26C is classified as obsolete by the original manufacturer (Littelfuse Inc.). The 20KPA26CA, produced by MDE Semiconductor Inc., represents an active alternative within the same 20KPA series, ensuring continued component availability for new designs and legacy system support.

Q: Are there any package or pinout considerations for substitution?

A: No. Both components use identical P600 axial through-hole packaging. No PCB layout modifications or rework procedures are required for substitution. The components are pin-compatible and can be installed using existing assembly processes.