P4KE43A-B Equivalent & Substitute Parts

Part Overview

The P4KE43A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates across a wide temperature range and is ROHS3 compliant. The part is currently in active production status with 1168 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity when the primary part becomes unavailable or when alternative packaging formats are required.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	36.8V
Voltage - Breakdown (Min)	40.9V
Voltage - Clamping (Max) @ Ipp	59.3V
Current - Peak Pulse (10/1000µs)	6.9A
Power - Peak Pulse	400W
Operating Temperature Range	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	DO-204AL (DO-41)
Type	Zener
Unidirectional Channels	1

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE43A-B is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 36.8V
Voltage - Breakdown (Min): 40.9V
Voltage - Clamping (Max) @ Ipp: 59.3V
Unidirectional Channels: 1
Type: Zener
Mounting Type: Through Hole
Applications: General Purpose

Substitute parts must maintain identical voltage specifications (reverse standoff, breakdown, and clamping voltages) and unidirectional topology to ensure functional equivalence in circuit protection applications. Current rating and power dissipation may vary within acceptable ranges for the application category. Package format variations (DO-204AL vs. DO-204AC) are permissible provided the through-hole mounting requirement is maintained. All substitutes must retain active product status and ROHS3 compliance.

Parameter Comparison

Parameter	P4KE43A-B (Littelfuse)	P4KE43A (Taiwan Semiconductor)	P6KE43A (Diotec)
Manufacturer	Littelfuse Inc.	Taiwan Semiconductor Corporation	Diotec Semiconductor
Voltage - Reverse Standoff (Typ)	36.8V	36.8V	36.8V
Voltage - Breakdown (Min)	40.9V	40.9V	40.9V
Voltage - Clamping (Max) @ Ipp	59.3V	59.3V	59.3V
Current - Peak Pulse (10/1000µs)	6.9A	7A	10.6A
Power - Peak Pulse	400W	400W	600W
Operating Temperature Range	-55°C ~ 175°C	-55°C ~ 175°C	-50°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL (DO-41)	DO-204AL (DO-41)	DO-204AC (DO-15)
Type	Zener	Zener	Zener
Unidirectional Channels	1	1	1
Product Status	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Bulk	Tape & Reel (TR)	-
Inventory Status	1168 Pcs	994 Pcs	10300 Pcs

Engineering Selection Recommendations

All three parts maintain identical voltage protection specifications (36.8V reverse standoff, 40.9V breakdown minimum, 59.3V clamping maximum) and are suitable for direct substitution in general-purpose TVS applications. Selection should be based on the following criteria:

P4KE43A (Taiwan Semiconductor Corporation): Direct functional equivalent with matching current rating (7A) and power dissipation (400W). Differs only in packaging format (Tape & Reel vs. Bulk) and manufacturer. Recommended for high-volume production environments requiring automated assembly.

P6KE43A (Diotec Semiconductor): Functionally equivalent with enhanced current handling (10.6A) and power dissipation (600W). Package format differs (DO-204AC vs. DO-204AL), requiring PCB layout verification for pin spacing compatibility. Recommended for applications requiring higher transient current capacity or when DO-15 package footprint is acceptable. Operating temperature minimum is -50°C versus -55°C for primary part.

All substitutes maintain active product status, ROHS3 compliance, and REACH unaffected status. Selection among these parts should be driven by packaging requirements, inventory availability, and PCB design constraints rather than electrical performance, as voltage protection characteristics are identical.

Frequently Asked Questions (FAQ)

Q: Can P4KE43A from Taiwan Semiconductor Corporation replace P4KE43A-B from Littelfuse?

A: Yes. Both parts share identical voltage specifications (36.8V reverse standoff, 40.9V breakdown, 59.3V clamping), current rating (approximately 7A), and power dissipation (400W). The primary difference is packaging format: Littelfuse supplies in Bulk, while Taiwan Semiconductor provides Tape & Reel format. Electrical performance and circuit protection capability are equivalent.

Q: What is the difference between P4KE43A and P6KE43A?

A: Both maintain identical voltage protection parameters. P6KE43A offers higher current capacity (10.6A vs. 7A) and greater power dissipation (600W vs. 400W). The package format differs: P4KE43A uses DO-204AL (DO-41), while P6KE43A uses DO-204AC (DO-15). PCB footprint compatibility must be verified before substitution. P6KE43A has a minimum operating temperature of -50°C compared to -55°C for P4KE43A variants.

Q: Are package format differences between DO-204AL and DO-204AC critical?

A: Yes. DO-204AL (DO-41) and DO-204AC (DO-15) have different physical dimensions and pin spacing. PCB layout and component footprints must accommodate the selected package. Verify board design compatibility before substituting between these package types.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. P4KE43A-B, P4KE43A, and P6KE43A are all ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99. All parts maintain active product status and are suitable for current production applications.

Q: Which substitute should I select for maximum inventory availability?

A: P6KE43A from Diotec Semiconductor currently has the highest inventory level (10,300 units). However, package format compatibility with your PCB design must be confirmed before selection.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message