5KP20-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP20-B is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 20V reverse standoff voltage rating and 5000W peak pulse power handling capability in a through-hole P600 axial package. The 5KP20-B is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility for circuit protection requirements.

Substiute Parts

5KP20-B

Littelfuse Inc.In Stock: 12645KP20-B Datasheet

Current PartRFQ

5KP20A

Diotec SemiconductorIn Stock: 172765KP20A Datasheet

DirectRFQ

5KP20A-B

Littelfuse Inc.In Stock: 9635KP20A-B Datasheet

DirectRFQ

SLD20U-017-B

Littelfuse Inc.In Stock: 831SLD20U-017-B Datasheet

MFR RecommendedRFQ

5KP20A-TP

Micro Commercial CoIn Stock: 10335KP20A-TP Datasheet

MFR RecommendedRFQ

5KP20E3/TR13

Microchip TechnologyIn Stock: 11575KP20E3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 5KP20-B is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Voltage - Reverse Standoff (Typ): 20V (exact match required)
• Voltage - Breakdown (Min): 21.02V to 22.2V (acceptable range)
• Power - Peak Pulse: 5000W (5kW) (exact match required)
• Unidirectional Channels: 1 (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: P600 or R-6 Axial (compatible packages)
• Operating Temperature Range: -55°C minimum to 175°C maximum (minimum requirement)

Voltage - Clamping (Max) @ Ipp varies among substitutes (32.4V to 35.8V), which is acceptable as this parameter represents the maximum transient voltage suppression level and does not prevent functional substitution when other critical parameters align.

All substitute parts listed maintain the same 20V reverse standoff voltage, 5000W peak pulse power rating, unidirectional topology, and through-hole axial mounting configuration as the 5KP20-B.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

5KP20A-B (Littelfuse Inc.) and SLD20U-017-B (Littelfuse Inc.) are the preferred substitutes. Both maintain identical electrical specifications to the 5KP20-B, including the -55°C to 175°C operating temperature range, P600 axial package, and ROHS3 compliance. SLD20U-017-B carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability. Both parts are in active production status with confirmed inventory availability.

Secondary Substitutes (Acceptable Compatibility):

5KP20A (Diotec Semiconductor) and 5KP20E3/TR13 (Microchip Technology) are functionally equivalent with minor parameter variations. The 5KP20A operates at -50°C minimum temperature (versus -55°C for the main part), which may be acceptable depending on application requirements. The 5KP20E3/TR13 exhibits a slightly higher clamping voltage of 35.8V compared to the main part's 34.02V, remaining within acceptable transient suppression performance.

Package Consideration:

5KP20A-TP (Micro Commercial Co) uses an R-6 axial package instead of P600. While electrically equivalent, the R-6 package has different physical dimensions. This substitute is suitable only when PCB layout accommodates the R-6 form factor.

All substitute parts maintain ROHS3 compliance and are suitable for general-purpose transient voltage suppression applications.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP20A-TP as a direct replacement for 5KP20-B?

A: 5KP20A-TP is electrically equivalent but uses an R-6 axial package instead of P600. Direct PCB substitution requires verification that the R-6 package dimensions fit the existing through-hole footprint. If the PCB is designed specifically for P600 spacing, 5KP20A-TP will not mount correctly.

Q: What is the difference between the clamping voltage values across substitute parts?

A: Voltage - Clamping (Max) @ Ipp represents the maximum transient voltage level the diode suppresses during peak pulse conditions. The 5KP20-B clamps at 34.02V, while substitutes range from 32.4V to 35.8V. All values provide adequate overvoltage protection for 20V standoff applications. Lower clamping voltages (32.4V) provide tighter voltage regulation; higher values (35.8V) allow slightly more transient overshoot.

Q: Is SLD20U-017-B suitable for automotive applications?

A: Yes. SLD20U-017-B carries AEC-Q101 automotive qualification and is specifically graded for automotive use. This part is recommended for automotive circuit protection applications requiring qualified component status.

Q: Why does 5KP20A have a -50°C minimum operating temperature instead of -55°C?

A: The 5KP20A from Diotec Semiconductor specifies -50°C as the minimum operating temperature, compared to -55°C for the 5KP20-B. This difference is acceptable for most applications. Selection depends on whether the circuit operates below -50°C; if not, 5KP20A is fully compatible.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (5KP20A, 5KP20A-B, SLD20U-017-B, 5KP20A-TP, and 5KP20E3/TR13) are ROHS3 compliant, matching the environmental compliance status of the 5KP20-B.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in three packaging formats: Tape & Reel (TR) for automated assembly, Bulk for manual assembly, and Cut Tape (CT) for mixed-volume applications. All maintain through-hole axial mounting with P600 or R-6 package options.