Equivalent & Substitute Parts for 3KP43C-B TVS Diode

Part Overview

The 3KP43C-B is a through-hole transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., rated at 43V reverse standoff with a 72.87V maximum clamping voltage. This bidirectional zener diode is designed for general-purpose transient protection applications. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain the 43V voltage class and through-hole P600 or R-6 axial package compatibility while meeting or exceeding the electrical performance specifications.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	43	V
Voltage - Breakdown (Min)	45.27	V
Voltage - Clamping (Max) @ Ipp	72.87	V
Current - Peak Pulse (10/1000µs)	43.2	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	-
Package / Case	P600, Axial	-
Type	Zener	-
Bidirectional Channels	1	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution for the 3KP43C-B is determined by the following critical parameters:

Voltage Class: All substitutes must maintain the 43V reverse standoff voltage rating to ensure proper circuit protection thresholds
Package Compatibility: Through-hole axial packages (P600 or R-6) are required for direct mechanical and electrical compatibility
Bidirectional Operation: Single-channel zener diode configuration must be preserved
Operating Temperature Range: -55°C to 175°C (TJ) compatibility required
RoHS3 Compliance: All substitutes must meet ROHS3 requirements

Three substitute parts meet these criteria with varying power ratings and peak pulse current capabilities. The 5KP43CA-B provides a direct series upgrade within the same manufacturer. The 15KP43CA-TP and 15KPA43CAE3/TR13 offer higher power dissipation ratings (15kW vs. 3kW) with different packaging and current handling specifications.

Parameter Comparison

Parameter	3KP43C-B	5KP43CA-B	15KP43CA-TP	15KPA43CAE3/TR13
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Micro Commercial Co	Microchip Technology
Product Status	Obsolete	Active	Active	Active
Voltage - Reverse Standoff (Typ)	43V	43V	43V	43V
Voltage - Breakdown (Min)	45.27V	47.8V	47.8V	48V
Voltage - Clamping (Max) @ Ipp	72.87V	69.4V	69.7V	69.8V
Current - Peak Pulse (10/1000µs)	43.2A	74.6A	-	216.3A
Power - Peak Pulse	3000W	5000W	15000W	15000W
Operating Temperature	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	P600, Axial	P600, Axial	R-6, Axial	P600, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

5KP43CA-B (Littelfuse Inc.): This part is the direct active replacement from the same manufacturer. It maintains P600 axial package compatibility and ROHS3 compliance. The 5KP series provides increased power dissipation (5kW vs. 3kW) and higher peak pulse current (74.6A vs. 43.2A) while preserving the same voltage class and operating temperature range. This is the preferred substitute for direct form-fit-function replacement.

15KP43CA-TP (Micro Commercial Co): This part offers 15kW power dissipation in an R-6 axial package. The different package footprint (R-6 vs. P600) requires PCB layout verification. ROHS3 and REACH compliance are confirmed. Peak pulse current specification is not provided in the data.

15KPA43CAE3/TR13 (Microchip Technology): This part delivers the highest power rating (15kW) with the highest peak pulse current (216.3A) while maintaining P600 package compatibility. It is supplied in tape and reel format and meets ROHS3 and REACH compliance requirements. This option provides maximum transient protection capability within the 43V voltage class.

Frequently Asked Questions (FAQ)

Q: Can I use the 5KP43CA-B as a direct replacement for the 3KP43C-B?

A: Yes. The 5KP43CA-B maintains identical voltage ratings (43V reverse standoff), the same P600 axial through-hole package, and equivalent operating temperature range (-55°C to 175°C). It provides enhanced power dissipation (5kW vs. 3kW) and higher peak pulse current capability, making it a suitable upgrade substitute.

Q: What is the difference between the 15KP43CA-TP and 15KPA43CAE3/TR13?

A: Both parts offer 15kW power dissipation and 43V voltage class operation. The 15KP43CA-TP uses an R-6 axial package, while the 15KPA43CAE3/TR13 uses the P600 axial package. The 15KPA43CAE3/TR13 provides significantly higher peak pulse current (216.3A vs. unspecified). Package selection depends on PCB layout requirements and lead spacing compatibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three substitute parts (5KP43CA-B, 15KP43CA-TP, and 15KPA43CAE3/TR13) are ROHS3 compliant. The 15KP43CA-TP and 15KPA43CAE3/TR13 also carry REACH compliance confirmation.

Q: Can I use a higher power-rated part (15kW) in place of the 3kW original?

A: Yes. Higher power-rated TVS diodes within the same voltage class provide enhanced transient protection capability. The 15KP43CA-TP and 15KPA43CAE3/TR13 maintain the 43V voltage specifications while offering increased energy absorption capacity. Circuit performance remains within design parameters.

Q: What packaging formats are available?

A: The 5KP43CA-B is supplied in bulk packaging. The 15KP43CA-TP is supplied in cut tape format. The 15KPA43CAE3/TR13 is supplied in tape and reel format. All three maintain through-hole axial mounting compatibility with either P600 or R-6 package footprints.

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