Littelfuse 15KP48 Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The Littelfuse 15KP48 is a unidirectional Zener-type transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. Rated at 48V reverse standoff with an 81.59V maximum clamping voltage, this component provides 15kW peak pulse power dissipation in a through-hole P600 axial package.

The 15KP48 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements for systems utilizing this component.

Substiute Parts

15KP48

Littelfuse Inc.In Stock: 85115KP48 Datasheet

Current PartRFQ

30KP48A-TP

Micro Commercial CoIn Stock: 89830KP48A-TP Datasheet

MFR RecommendedRFQ

5KP48AHE3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 11095KP48AHE3/54 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 15KP48 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 48V
• Voltage - Clamping (Max) @ Ipp: within acceptable range for the application (77.4V to 81.6V)
• Type: Zener, unidirectional
• Operating Temperature Range: -55°C to 175°C (TJ)

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: P600 or R-6 axial packages (both are through-hole axial configurations)

Compliance Criteria:

• RoHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The substitute parts identified—30KP48A-TP and 5KP48AHE3/54—maintain the same 48V reverse standoff voltage and clamping voltage range, operate across the same temperature spectrum, and are available in compatible through-hole axial packages. Both substitutes are active products with current manufacturing status and full RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

30KP48A-TP (Micro Commercial Co): This substitute is an active product with higher peak pulse power rating (30kW vs. 15kW). It maintains identical reverse standoff voltage (48V) and nearly identical clamping voltage (81.6V vs. 81.59V). The R-6 axial package is mechanically compatible with through-hole mounting applications. Full RoHS3 compliance and unlimited MSL rating ensure regulatory and environmental compatibility. This option provides enhanced power dissipation capability for applications requiring higher transient energy absorption.

5KP48AHE3/54 (Vishay General Semiconductor - Diodes Division): This substitute is an active product with AEC-Q101 automotive qualification. It maintains the same 48V reverse standoff voltage and operates within the same temperature range. The clamping voltage is lower (77.4V vs. 81.59V), and peak pulse power is reduced (5kW vs. 15kW). The P600 axial package provides direct mechanical compatibility. Full RoHS3 compliance and unlimited MSL rating are confirmed. This option is suitable for applications with lower transient energy requirements or where automotive-grade qualification is beneficial.

Both substitutes are currently in active production status, ensuring long-term supply availability compared to the obsolete 15KP48.

Frequently Asked Questions (FAQ)

Q: Can the 30KP48A-TP directly replace the 15KP48 in my circuit? A: The 30KP48A-TP maintains the same 48V reverse standoff voltage and clamping voltage (81.6V vs. 81.59V), making it electrically compatible. The R-6 axial package is mechanically suitable for through-hole mounting. The higher power rating (30kW vs. 15kW) provides additional margin. Verify that your PCB layout accommodates the R-6 package dimensions.

Q: What is the difference between the two substitute options? A: The 30KP48A-TP offers higher peak pulse power (30kW) with nearly identical clamping voltage. The 5KP48AHE3/54 provides lower peak pulse power (5kW) but includes AEC-Q101 automotive qualification and uses the same P600 package as the original 15KP48. Select based on your application's transient energy requirements and any automotive qualification mandates.

Q: Are both substitutes RoHS3 compliant? A: Yes, both the 30KP48A-TP and 5KP48AHE3/54 are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the compliance profile of the original 15KP48.

Q: Does the package difference between P600 and R-6 affect circuit performance? A: Both P600 and R-6 are through-hole axial packages. The primary difference is physical dimensions. The R-6 package used by the 30KP48A-TP may have different lead spacing or body length. Confirm that your PCB footprint and component placement accommodate the selected package before implementation.

Q: Why is the 15KP48 listed as obsolete? A: The 15KP48 is no longer manufactured by Littelfuse Inc. The identified substitutes—both active products from alternative manufacturers—provide equivalent or enhanced electrical performance while ensuring continued supply chain availability.

Q: Can I use the 5KP48AHE3/54 if my application requires 15kW peak pulse power? A: No. The 5KP48AHE3/54 is rated for 5kW peak pulse power, which is insufficient for applications requiring 15kW dissipation. The 30KP48A-TP, rated at 30kW, is the appropriate choice for such applications.