Equivalent & Substitute Parts for 3KP20 TVS Diode

Part Overview

The 3KP20 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This component features a 20V reverse standoff voltage with a 34.02V maximum clamping voltage and 92.6A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain compatibility with existing circuit designs while meeting current availability and compliance requirements.

Substiute Parts

3KP20

Littelfuse Inc.In Stock: 7973KP20 Datasheet

Current PartRFQ

5KP20A

Diotec SemiconductorIn Stock: 172765KP20A Datasheet

DirectRFQ

5KP20A-TP

Micro Commercial CoIn Stock: 10335KP20A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP20 is determined by the following critical parameters: reverse standoff voltage (20V nominal), unidirectional channel configuration (1 channel), through-hole axial mounting, and general-purpose TVS application classification. The identified substitute parts maintain the 20V reverse standoff voltage specification and unidirectional topology, ensuring functional compatibility in circuit protection applications. Substitute parts may exhibit variations in clamping voltage, peak pulse current, and power dissipation ratings within acceptable engineering tolerances for the TVS diode category. Package variants (P600 vs. R-6) are considered compatible within through-hole axial mounting constraints.

Parameter Comparison

Engineering Selection Recommendations

Both 5KP20A (Diotec Semiconductor) and 5KP20A-TP (Micro Commercial Co) are active product alternatives to the obsolete 3KP20. The 5KP20A from Diotec maintains the P600 axial package format and provides enhanced power dissipation (5000W vs. 3000W) with increased peak pulse current capability (154A vs. 92.6A). The 5KP20A-TP from Micro Commercial Co offers identical electrical performance in an R-6 axial package variant, with operating temperature range matching the original specification (-55°C ~ 175°C). Both alternatives maintain ROHS3 compliance and the critical 20V reverse standoff voltage specification. Selection between these alternatives depends on package footprint compatibility and current availability requirements within your supply chain.

Frequently Asked Questions (FAQ)

Q: Can the 5KP20A directly replace the 3KP20 in existing designs? A: Yes. Both parts maintain the 20V reverse standoff voltage, unidirectional topology, and through-hole axial mounting. The 5KP20A provides superior power handling (5000W vs. 3000W), making it functionally compatible for general-purpose TVS applications.

Q: What is the difference between the P600 and R-6 packages? A: Both are through-hole axial packages for TVS diodes. The P600 is the original package format; the R-6 is an alternative axial variant. Physical dimensions and lead spacing may differ, requiring verification against your PCB layout specifications.

Q: Are there temperature range differences between substitutes? A: The 5KP20A (Diotec) operates from -50°C to 175°C, while the 3KP20 and 5KP20A-TP both operate from -55°C to 175°C. For applications requiring operation below -50°C, the 5KP20A-TP is the appropriate selection.

Q: Do all substitute parts meet RoHS compliance? A: Yes. Both 5KP20A and 5KP20A-TP are ROHS3 compliant, matching the compliance status of the original 3KP20.

Q: What is the significance of the higher peak pulse current in the 5KP20A? A: The 5KP20A provides 154A peak pulse current compared to the 3KP20's 92.6A. This represents enhanced transient protection capability within the same voltage class, offering improved margin for surge events without compromising circuit compatibility.