3KP48CA Transient Voltage Suppressor - Equivalent & Substitute Parts

Part Overview

The 3KP48CA is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component features a 48V reverse standoff voltage with a 77.4V maximum clamping voltage and 38.8A peak pulse current capability at 3000W peak pulse power. The product is currently obsolete, necessitating identification of functionally equivalent alternatives from active manufacturers to maintain design continuity and ensure component availability for new production and field replacements.

Substiute Parts

3KP48CA

Littelfuse Inc.In Stock: 11113KP48CA Datasheet

Current PartRFQ

5KP48CA

Diotec SemiconductorIn Stock: 44145KP48CA Datasheet

DirectRFQ

30KP48CA-TP

Micro Commercial CoIn Stock: 81630KP48CA-TP Datasheet

MFR RecommendedRFQ

3KP48CA-TP

Micro Commercial CoIn Stock: 8513KP48CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP48CA is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 48V
• Voltage - Breakdown (Min): 53.3V minimum
• Voltage - Clamping (Max) @ Ipp: 77.4V maximum
• Type: Zener, bidirectional
• Applications: General Purpose

Mechanical Compatibility Criteria:

• Mounting Type: Through Hole
• Package / Case: Axial configuration (P600 or R-6)
• Bidirectional Channels: 1

Compliance Criteria:

• RoHS Status: ROHS3 Compliant

The substitute parts identified maintain the core voltage protection characteristics (48V standoff, 53.3V breakdown minimum, 77.4V clamping maximum) while offering variations in peak pulse current and power dissipation ratings. All substitutes are active products with current manufacturer support and full RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

Direct Electrical Equivalent (Preferred for Pin-Compatible Replacement): The 3KP48CA-TP from Micro Commercial Co provides identical electrical performance (48V standoff, 53.3V breakdown, 77.4V clamping, 38.8A peak pulse, 3000W peak power) with active product status and full ROHS3 compliance. This part is the primary recommendation for direct substitution in existing designs.

Enhanced Performance Alternative (Higher Power Dissipation): The 5KP48CA from Diotec Semiconductor maintains voltage compatibility (48V standoff, 53.3V breakdown, 77.4V clamping) while offering increased peak pulse current (65A) and power dissipation (5000W). This part is suitable for applications requiring higher transient energy absorption. Operating temperature range is -50 to 175°C, which is acceptable for most industrial applications.

High-Power Alternative (Extreme Transient Protection): The 30KP48CA-TP from Micro Commercial Co provides the same voltage standoff and breakdown characteristics with significantly elevated power dissipation (30000W) and a slightly higher clamping voltage (81.6V). This part is appropriate for high-energy transient environments where maximum protection margin is required.

All substitute parts maintain ROHS3 compliance and are manufactured by established component suppliers with active product support.

Frequently Asked Questions (FAQ)

Q: Can the 5KP48CA be used as a direct replacement for the 3KP48CA? A: The 5KP48CA is electrically compatible, maintaining the same 48V standoff voltage, 53.3V breakdown voltage, and 77.4V clamping voltage. The primary difference is increased peak pulse current (65A vs. 38.8A) and power dissipation (5000W vs. 3000W), which provides enhanced protection capability. Package compatibility depends on PCB layout; both use P600 axial packages. The 5KP48CA is suitable for direct substitution in applications where the higher power rating does not create thermal or layout constraints.

Q: What is the difference between the 3KP48CA-TP and 30KP48CA-TP? A: Both parts maintain the 48V reverse standoff voltage required for circuit protection. The 3KP48CA-TP provides 3000W peak pulse power with 38.8A peak pulse current, matching the original 3KP48CA specification. The 30KP48CA-TP provides 30000W peak pulse power with a slightly higher clamping voltage (81.6V vs. 77.4V). Selection depends on transient energy levels in the application; the 30KP48CA-TP is used for high-energy transient environments.

Q: Are all substitute parts RoHS3 compliant? A: Yes. The 5KP48CA, 3KP48CA-TP, and 30KP48CA-TP are all ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing.

Q: What is the operating temperature range for each substitute? A: The 3KP48CA-TP and 30KP48CA-TP operate from -55 to 175°C, matching the original 3KP48CA specification. The 5KP48CA operates from -50 to 175°C, which is acceptable for most industrial and commercial applications but may require evaluation for extreme low-temperature environments below -50°C.

Q: Can the 30KP48CA-TP be used in place of the 3KP48CA in all applications? A: The 30KP48CA-TP is electrically compatible with the same 48V standoff voltage and breakdown characteristics. However, the higher clamping voltage (81.6V vs. 77.4V) and significantly higher power dissipation (30000W vs. 3000W) may affect circuit behavior in sensitive applications. Use the 30KP48CA-TP only when higher transient protection margin is required or when the application specifically demands higher power dissipation capability.

Q: What packaging differences exist between substitute parts? A: The 3KP48CA and 5KP48CA use P600 axial packages. The 3KP48CA-TP and 30KP48CA-TP use R-6 axial packages. Both package types are through-hole axial configurations suitable for PCB mounting. Verify PCB pad spacing and component placement clearances before substitution to ensure mechanical compatibility.