P4KE43 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The P4KE43 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. The device features a 36.8V reverse standoff voltage with 62.27V maximum clamping voltage and 400W peak pulse power rating in a DO-204AL (DO-41) axial package.

The P4KE43 is classified as obsolete. Equivalent and substitute parts are available from multiple manufacturers with active product status, offering compatible electrical characteristics and identical or enhanced performance parameters within the same package family.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	36.8	V
Voltage - Breakdown (Min)	38.75	V
Voltage - Clamping (Max) @ Ipp	62.27	V
Current - Peak Pulse (10/1000µs)	6.9	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 175	°C (TJ)
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the P4KE43 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 36.8V
Voltage - Clamping (Max) @ Ipp: 59.3V to 62.27V range
Current - Peak Pulse (10/1000µs): 6.9A minimum
Power - Peak Pulse: 400W minimum
Package / Case: DO-204AL (DO-41) or DO-204AC (DO-15) axial through-hole
Operating Temperature: -55°C to 175°C minimum
Type: Zener unidirectional TVS diode
RoHS3 Compliance

Substitute parts are grouped into two categories based on package type:

Category 1: DO-204AL (DO-41) Package Equivalents — Direct mechanical and electrical replacements maintaining the original axial lead configuration and footprint. These include P4KE43A variants from Taiwan Semiconductor Corporation and Micro Commercial Co, as well as P4KE43A-G from Comchip Technology.

Category 2: DO-204AC (DO-15) Package Alternatives — Enhanced performance substitutes with higher peak pulse current ratings (10.1A to 10.6A) and 600W power dissipation, available in the DO-15 package. These include P6KE43A variants from Diotec Semiconductor, Micro Commercial Co, and Comchip Technology. These parts maintain electrical compatibility while offering increased current handling capacity.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Operating Temp (°C)	Product Status
P4KE43	Littelfuse Inc.	36.8	62.27	6.9	400	DO-204AL (DO-41)	-55 to 175	Obsolete
P4KE43A	Taiwan Semiconductor Corporation	36.8	59.3	7.0	400	DO-204AL (DO-41)	-55 to 175	Active
P4KE43A-AP	Micro Commercial Co	36.8	59.3	6.9	400	DO-204AL (DO-41)	-55 to 175	Active
P4KE43A-BP	Micro Commercial Co	36.8	59.3	6.9	400	DO-204AL (DO-41)	-55 to 175	Active
P4KE43A-G	Comchip Technology	36.8	59.3	6.75	400	DO-204AL (DO-41)	-55 to 150	Active
P4KE43A-TP	Micro Commercial Co	36.8	59.3	6.9	400	DO-204AL (DO-41)	-55 to 175	Active
P6KE43A	Diotec Semiconductor	36.8	59.3	10.6	600	DO-204AC (DO-15)	-50 to 175	Active
P6KE43A-AP	Micro Commercial Co	36.8	59.3	10.1	600	DO-204AC (DO-15)	-55 to 175	Active
P6KE43A-BP	Micro Commercial Co	36.8	59.3	10.1	600	DO-204AC (DO-15)	-55 to 175	Active
P6KE43A-HF	Comchip Technology	36.8	59.3	10.12	600	DO-204AC (DO-15)	-55 to 150	Active

Engineering Selection Recommendations

Direct Replacement (Same Package - DO-204AL/DO-41):

For applications requiring identical mechanical fit and footprint compatibility, select from P4KE43A, P4KE43A-AP, P4KE43A-BP, P4KE43A-TP, or P4KE43A-G. All maintain the 36.8V standoff voltage, 400W power rating, and axial through-hole configuration. P4KE43A from Taiwan Semiconductor Corporation and variants from Micro Commercial Co (P4KE43A-AP, P4KE43A-BP, P4KE43A-TP) are recommended for full temperature range operation (-55°C to 175°C). P4KE43A-G from Comchip Technology operates to 150°C maximum junction temperature.

Enhanced Performance Alternative (DO-204AC/DO-15 Package):

For applications where PCB layout permits package substitution, P6KE43A series parts offer increased peak pulse current (10.1A to 10.6A) and 600W power dissipation. These parts maintain the 36.8V standoff voltage and 59.3V clamping voltage while providing superior transient energy absorption. P6KE43A-AP and P6KE43A-BP from Micro Commercial Co support the full -55°C to 175°C temperature range. P6KE43A from Diotec Semiconductor and P6KE43A-HF from Comchip Technology operate to -50°C and -55°C minimum respectively, with 150°C maximum junction temperature for the HF variant.

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

Frequently Asked Questions (FAQ)

Q: Can P4KE43A variants be used as direct replacements for the obsolete P4KE43?

A: Yes. P4KE43A, P4KE43A-AP, P4KE43A-BP, and P4KE43A-TP maintain identical package configuration (DO-204AL/DO-41), reverse standoff voltage (36.8V), and power rating (400W). These parts are mechanically and electrically interchangeable with the original P4KE43 in existing PCB designs.

Q: What is the difference between DO-204AL (DO-41) and DO-204AC (DO-15) packages?

A: Both are axial through-hole packages with identical lead spacing and mounting compatibility. DO-204AC (DO-15) has a slightly larger body diameter, accommodating higher power dissipation. P6KE43A series parts in DO-15 package provide 600W peak pulse power versus 400W for DO-41 variants. PCB footprints are compatible for through-hole mounting.

Q: Should I select P4KE43A or P6KE43A for new designs?

A: Selection depends on transient energy requirements. For applications matching the original 400W specification, P4KE43A variants provide direct equivalence. For circuits requiring enhanced transient suppression with higher peak pulse current handling, P6KE43A series (600W, 10.1A to 10.6A) offers superior performance while maintaining the same voltage protection threshold.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts meet ROHS3 compliance requirements. Littelfuse P4KE43 original part is also ROHS3 compliant.

Q: What is the temperature operating range for each substitute?

A: Most substitutes support -55°C to 175°C junction temperature range. P6KE43A from Diotec operates to -50°C minimum. P4KE43A-G and P6KE43A-HF from Comchip Technology are rated to 150°C maximum junction temperature. Verify application temperature requirements against selected part specifications.

Q: Can I use P6KE43A parts in applications originally designed for P4KE43?

A: Electrically yes, with mechanical considerations. P6KE43A parts maintain the 36.8V standoff and 59.3V clamping voltage. However, the DO-15 package body is larger than DO-41. Verify PCB layout clearance and lead hole spacing compatibility before substitution. If PCB footprint permits, P6KE43A variants provide enhanced transient protection capability.

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