5KP43CA-B Equivalent & Substitute Parts

Part Overview

The 5KP43CA-B is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This P600 package device features a 43V reverse standoff voltage with 5000W peak pulse power handling capability and 74.6A peak pulse current. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified based on matching electrical performance parameters within acceptable tolerances for TVS diode applications, including reverse standoff voltage, clamping voltage, peak pulse current, and power dissipation ratings.

Key Parameters

Parameter	5KP43CA-B Value	Unit
Voltage - Reverse Standoff (Typ)	43	V
Voltage - Breakdown (Min)	47.8	V
Voltage - Clamping (Max) @ Ipp	69.4	V
Current - Peak Pulse (10/1000µs)	74.6	A
Power - Peak Pulse	5000	W
Bidirectional Channels	1	—
Operating Temperature Range	-55 to 175	°C (TJ)
Package / Case	P600, Axial	—
Mounting Type	Through Hole	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 5KP43CA-B are categorized by package type and power rating, as these parameters determine mechanical and thermal compatibility in circuit applications.

Grouping Logic:

Direct Package Equivalents (P600 Package): Parts maintaining identical P600 axial package and 5000W power rating enable direct board-level substitution without layout modification.
Lower Power Alternatives (1500W and 600W Packages): Parts with reduced peak pulse power ratings (1500W or 600W) and different package types (DO-201, DO-15) are suitable only where circuit design accommodates lower current handling and thermal dissipation requirements.

Key Parameters Determining Substitution:

Reverse standoff voltage (43V nominal)
Clamping voltage range (69.4V maximum)
Peak pulse current capability (74.6A for direct equivalents)
Power dissipation rating (5000W for direct equivalents)
Package type and mounting configuration
Operating temperature range (-55°C to 175°C)

Parameter Comparison

Part Number	Manufacturer	Reverse Standoff (V)	Clamping Voltage (V)	Peak Pulse Current (A)	Power Rating (W)	Package	RoHS Status
5KP43CA-B	Littelfuse Inc.	43	69.4	74.6	5000	P600	ROHS3
5KP43CA	Littelfuse Inc.	43	69.4	74.6	5000	P600	ROHS3
SLD43-018-B	Littelfuse Inc.	43	69.4	74.6	5000	P600	ROHS3
1.5KE51CA	Taiwan Semiconductor Corporation	43.6	70.1	22	1500	DO-201	ROHS3
1.5KE56CA	Taiwan Semiconductor Corporation	47.8	77	20	1500	DO-201	ROHS3
1.5KE47CA	Diotec Semiconductor	40.2	64.8	24	1500	DO-201	Not applicable
P6KE51CA	Taiwan Semiconductor Corporation	43.6	70.1	8.6	600	DO-15	ROHS3
P6KE56CA	Taiwan Semiconductor Corporation	47.8	77	7.8	600	DO-15	ROHS3
P6KE47CA	Diotec Semiconductor	40.2	64.8	9.7	600	DO-15	ROHS3
SA48CA	Taiwan Semiconductor Corporation	48	77.4	6.7	500	DO-15	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Identical Electrical and Mechanical Performance):

The 5KP43CA (Littelfuse Inc., Cut Tape packaging) and SLD43-018-B (Littelfuse Inc., Bulk packaging) are direct functional equivalents to the 5KP43CA-B. Both maintain identical electrical specifications, P600 package configuration, 5000W power rating, and RoHS3 compliance. Selection between these three parts depends on packaging format requirements (Bulk versus Cut Tape) and inventory availability.

Lower Power Substitutes (Reduced Current and Power Handling):

The 1.5KE series (1.5KE51CA, 1.5KE56CA, 1.5KE47CA) and P6KE series (P6KE51CA, P6KE56CA, P6KE47CA) provide alternative voltage protection with reduced peak pulse current and power dissipation. These parts are suitable only in applications where circuit design accommodates lower current handling (20-24A for 1.5KE series, 7.8-9.7A for P6KE series) and lower power ratings (1500W or 600W respectively).

Compliance and Certification:

All recommended substitutes maintain RoHS3 compliance status. The 1.5KE56CA carries AEC-Q101 automotive qualification and the SLD43-018-B carries AEC-Q101 automotive qualification, suitable for automotive-grade applications where specified.

Frequently Asked Questions (FAQ)

Q: Can the 1.5KE51CA replace the 5KP43CA-B in all applications?

A: The 1.5KE51CA provides equivalent reverse standoff voltage (43.6V) and clamping voltage (70.1V) but handles significantly lower peak pulse current (22A versus 74.6A) and power dissipation (1500W versus 5000W). Substitution is valid only if the application circuit design accommodates these reduced ratings and the DO-201 package is mechanically compatible with the board layout.

Q: What is the difference between the 5KP43CA-B and 5KP43CA?

A: Both parts are electrically and mechanically identical. The primary difference is packaging format: 5KP43CA-B is supplied in Bulk packaging, while 5KP43CA is supplied in Cut Tape (CT) packaging. Selection depends on assembly process requirements and inventory management.

Q: Why do the P6KE series parts have lower peak pulse current ratings?

A: The P6KE series uses the DO-15 (DO-204AC) package, which has lower thermal dissipation capability compared to the P600 package used in the 5KP series. This package limitation restricts peak pulse current to 6.7-9.7A and power dissipation to 500-600W. These parts are suitable for lower-current protection circuits only.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry RoHS3 compliance status except 1.5KE47CA, which shows "Not applicable" RoHS status. Verify compliance requirements for your specific application before selection.

Q: Can the SA48CA be used as a substitute?

A: The SA48CA provides similar reverse standoff voltage (48V) and clamping voltage (77.4V) but is limited to 6.7A peak pulse current and 500W power dissipation. This part is suitable only for low-current protection applications and is not recommended for applications requiring the full 74.6A current handling of the 5KP43CA-B.

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