Equivalent & Substitute Parts for 3KP48A-B TVS Diode

Part Overview

The 3KP48A-B is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 48V reverse standoff voltage, 77.4V maximum clamping voltage, and 3000W peak pulse power rating in a through-hole P600 axial package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

3KP48A-B

Littelfuse Inc.In Stock: 11253KP48A-B Datasheet

Current PartRFQ

5KP48A-B

LittelfuseIn Stock: 10695KP48A-B Datasheet

DirectRFQ

30KP48A-TP

Micro Commercial CoIn Stock: 89830KP48A-TP Datasheet

MFR RecommendedRFQ

3KP48A-TP

Micro Commercial CoIn Stock: 14283KP48A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3KP48A-B is determined by the following critical parameters:

• Voltage Rating Match: Reverse standoff voltage of 48V and breakdown voltage minimum of 53.3V must be maintained
• Clamping Voltage: Maximum clamping voltage at Ipp must not exceed 77.4V to ensure circuit protection integrity
• Package Compatibility: Through-hole axial mounting is required for PCB integration
• Diode Type: Unidirectional Zener configuration for single-direction transient suppression
• Operating Temperature: Full range of -55°C to 175°C must be supported

Three substitute parts meet these criteria with variations in power rating, packaging format, and product status.

Parameter Comparison

Engineering Selection Recommendations

5KP48A-B (Littelfuse): This part maintains identical voltage specifications and clamping characteristics to the 3KP48A-B while offering increased peak pulse current (65.9A) and power rating (5000W). Product status is active with full RoHS3 compliance and unlimited moisture sensitivity rating. Package remains P600 axial for direct mechanical compatibility.

3KP48A-TP (Micro Commercial Co): This part provides equivalent voltage and power specifications (3000W) matching the original 3KP48A-B. Product status is active with full RoHS3 compliance. Package changes to R-6 axial format, requiring PCB footprint verification. Cut tape packaging is available.

30KP48A-TP (Micro Commercial Co): This part maintains the 48V voltage rating with significantly elevated power rating (30000W) and clamping voltage of 81.6V. Product status is active with full RoHS3 compliance. Package is R-6 axial format in tape and reel configuration. Higher clamping voltage requires circuit analysis to confirm acceptability.

Frequently Asked Questions (FAQ)

Q: Can the 5KP48A-B directly replace the 3KP48A-B? A: Yes. The 5KP48A-B maintains identical voltage specifications (48V standoff, 53.3V breakdown, 77.4V clamping) and package format (P600 axial). The increased current and power ratings provide enhanced transient suppression capability without affecting circuit compatibility.

Q: What is the difference between P600 and R-6 packages? A: Both are through-hole axial packages for transient voltage suppressors. P600 and R-6 differ in physical dimensions and lead spacing. PCB footprint verification is required when substituting between these package types.

Q: Is the 30KP48A-TP suitable as a substitute? A: The 30KP48A-TP meets the 48V voltage requirement but has a maximum clamping voltage of 81.6V compared to 77.4V for the original part. Circuit analysis is necessary to determine if the higher clamping voltage is acceptable for your application. The R-6 package also requires footprint compatibility verification.

Q: Why is the 3KP48A-B listed as obsolete? A: Littelfuse has transitioned this part to obsolete status. Active alternatives from both Littelfuse (5KP48A-B) and Micro Commercial Co (3KP48A-TP, 30KP48A-TP) provide equivalent or enhanced functionality for new designs and ongoing production support.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitutes maintain ROHS3 compliance and MSL rating of 1 (unlimited), meeting environmental and reliability standards equivalent to the original 3KP48A-B.

Q: What should I verify before implementing a substitute? A: Confirm voltage specifications match your circuit requirements, verify PCB footprint compatibility with the selected package format (P600 or R-6), and validate that the clamping voltage is acceptable for your application's transient protection threshold.