5KP43A-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP43A-B is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates across a temperature range of -55°C to 175°C and is ROHS3 compliant. The part is currently active in production with 686 units in stock. Equivalent and substitute parts are identified based on matching electrical characteristics including reverse standoff voltage, clamping voltage, peak pulse current, and power dissipation ratings, as well as compatible package configurations.

Substiute Parts

5KP43A-B

Littelfuse Inc.In Stock: 7095KP43A-B Datasheet

Current PartRFQ

5KP43A

Littelfuse Inc.In Stock: 34105KP43A Datasheet

DirectRFQ

1.5KE47A

Taiwan Semiconductor CorporationIn Stock: 368961.5KE47A Datasheet

MFR RecommendedRFQ

1.5KE51A

MeritekIn Stock: 15511.5KE51A Datasheet

MFR RecommendedRFQ

P6KE51A

Fairchild SemiconductorIn Stock: 18607P6KE51A Datasheet

MFR RecommendedRFQ

5KP43A-TP

Micro Commercial CoIn Stock: 11985KP43A-TP Datasheet

MFR RecommendedRFQ

P6KE51A

Fairchild SemiconductorIn Stock: 18607P6KE51A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5KP43A-B are categorized based on electrical parameter compatibility and package interchangeability. The primary substitution criteria are:

Critical Matching Parameters:

• Voltage - Reverse Standoff (Typ): 43V nominal
• Voltage - Clamping (Max) @ Ipp: 69.4V nominal
• Current - Peak Pulse (10/1000µs): 74.6A nominal
• Power - Peak Pulse: 5000W (5kW)
• Unidirectional Zener type configuration
• Through-hole axial mounting

Package Compatibility:

• P600 axial package (primary equivalent)
• R-6 axial package (compatible alternative)
• DO-201 axial package (compatible alternative for lower power ratings)

Grouping Logic:

Group 1 - Direct Electrical & Package Equivalents (P600/R-6 packages, 5kW power rating):

• 5KP43A (Littelfuse, Cut Tape packaging)
• 5KP43A-TP (Micro Commercial Co, R-6 package variant)

Group 2 - Electrical Alternatives (Lower power rating, DO-201 package, different voltage characteristics):

• 1.5KE47A (Taiwan Semiconductor Corporation, 1.5kW power rating)
• 1.5KE51A (Meritek, 1.5kW power rating)

Group 3 - Limited Data Availability:

• P6KE51A (Fairchild Semiconductor, insufficient parameter data provided)

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (Recommended for 1:1 Replacement):

The 5KP43A (Littelfuse Inc., Cut Tape packaging) and 5KP43A-TP (Micro Commercial Co, R-6 package) are direct electrical equivalents to the 5KP43A-B. Both maintain identical voltage ratings (43V reverse standoff, 69.4V clamping), peak pulse current (74.6A), and power dissipation (5kW). All three parts are ROHS3 compliant, active in production, and operate across the same temperature range (-55°C to 175°C). The primary difference is packaging format: 5KP43A uses P600 axial package in Cut Tape format, while 5KP43A-TP uses R-6 axial package in Cut Tape format. Both are suitable for direct PCB substitution where the axial package footprint is compatible.

Alternative Substitutes (Lower Power Applications):

The 1.5KE47A (Taiwan Semiconductor Corporation) and 1.5KE51A (Meritek) are alternative TVS diodes with reduced power dissipation ratings (1.5kW versus 5kW) and lower peak pulse current capabilities (24A and 21.7A respectively). These parts operate within similar voltage ranges but with different package configurations (DO-201 for 1.5KE47A). These alternatives are suitable only for applications where the lower power rating and reduced current handling are acceptable. Both maintain ROHS3 compliance and active product status.

Limited Data Availability:

The P6KE51A (Fairchild Semiconductor) is listed as a substitute but lacks sufficient electrical parameter data for complete compatibility assessment. This part should be cross-referenced with the manufacturer datasheet before selection.

Frequently Asked Questions (FAQ)

Q: Can I use 5KP43A as a direct replacement for 5KP43A-B?

A: Yes. The 5KP43A is a direct electrical equivalent with identical voltage ratings (43V reverse standoff, 69.4V clamping), peak pulse current (74.6A), and power dissipation (5kW). The primary difference is packaging format (Cut Tape versus Bulk). Both are ROHS3 compliant and active products from Littelfuse Inc.

Q: What is the difference between P600 and R-6 package formats?

A: Both are axial through-hole packages for TVS diodes. The P600 and R-6 are different physical package designations. The 5KP43A-TP uses the R-6 package variant while maintaining identical electrical specifications to the P600-packaged 5KP43A-B. Package selection depends on PCB footprint compatibility and mechanical constraints.

Q: Can I substitute the 1.5KE47A for the 5KP43A-B?

A: The 1.5KE47A is an electrical alternative but not a direct replacement. It has a lower power dissipation rating (1.5kW versus 5kW), reduced peak pulse current (24A versus 74.6A), and different voltage characteristics (40.2V reverse standoff, 64.8V clamping). Use this part only if your application requires lower power handling and the voltage specifications are acceptable.

Q: Are all substitute parts ROHS3 compliant?

A: The 5KP43A, 5KP43A-TP, and 1.5KE47A are confirmed ROHS3 compliant. The 1.5KE51A and P6KE51A have incomplete compliance data in the provided specifications. Verify compliance status with the manufacturer before final selection.

Q: What is the operating temperature range for these TVS diodes?

A: The 5KP43A-B, 5KP43A, 5KP43A-TP, 1.5KE47A, and 1.5KE51A all operate across -55°C to 175°C (junction temperature). This range is consistent across all primary substitute options.

Q: How do I determine which substitute is appropriate for my application?

A: Selection depends on three factors: (1) Required power dissipation and peak pulse current handling, (2) Voltage protection specifications (reverse standoff and clamping voltages), and (3) PCB package footprint compatibility. The 5KP43A and 5KP43A-TP are direct replacements for high-power applications. The 1.5KE series are alternatives for lower-power protection circuits with different voltage ratings.