P4KE550C-B Equivalent & Substitute Parts

Part Overview

The P4KE550C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 495V reverse standoff voltage with 798V maximum clamping voltage and 520mA peak pulse current capability in a through-hole DO-204AL (DO-41) package format.

The P4KE550C-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this TVS diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	495	V
Voltage - Clamping (Max) @ Ipp	798	V
Current - Peak Pulse (10/1000µs)	520	mA
Power - Peak Pulse	400	W
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Operating Temperature Range	-55°C ~ 175°C	TJ
Type	Zener	-
Bidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitute parts for the P4KE550C-B are identified based on the following critical parameters that determine functional equivalence:

Reverse standoff voltage within the P4KE550 series specification
Peak pulse current rating of 520mA
Peak pulse power rating of 400W
Through-hole mounting configuration
DO-204AL / DO-41 package compatibility
Zener diode type with single bidirectional channel
General-purpose application suitability

The substitute parts P4KE550CA and P4KE550CA-B maintain these core electrical and mechanical characteristics, ensuring functional compatibility within the P4KE550 product family.

Parameter Comparison

Parameter	P4KE550C-B (Main)	P4KE550CA (Substitute)	P4KE550CA-B (Substitute)
Manufacturer	Littelfuse Inc.	SMC Diode Solutions	Littelfuse Inc.
Product Status	Obsolete	Active	Active
Voltage - Reverse Standoff (Typ)	495V	-	495V
Voltage - Breakdown (Min)	495V	-	522.5V
Voltage - Clamping (Max) @ Ipp	798V	-	760V
Current - Peak Pulse (10/1000µs)	520mA	-	520mA
Power - Peak Pulse	400W	400W	400W
Operating Temperature Range	-55°C ~ 175°C	-65°C ~ 175°C	-55°C ~ 175°C
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Type	Zener	Zener	Zener
Bidirectional Channels	1	1	1
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
ECCN	EAR99	EAR99	EAR99
HTSUS	8541.10.0080	8541.10.0080	8541.10.0080

Engineering Selection Recommendations

P4KE550CA-B is the primary recommended substitute for the obsolete P4KE550C-B. Both components are manufactured by Littelfuse Inc., share identical reverse standoff voltage (495V), peak pulse current (520mA), and operating temperature range (-55°C ~ 175°C). The P4KE550CA-B maintains active product status with full RoHS3 compliance and REACH unaffected classification. The clamping voltage differential (760V versus 798V) and breakdown voltage variation (522.5V versus 495V minimum) remain within the P4KE550 series design envelope.

P4KE550CA by SMC Diode Solutions serves as an alternative substitute with active product status and extended lower operating temperature limit (-65°C). This component shares identical power rating (400W) and package configuration. However, detailed voltage parameters are not provided for this variant. The P4KE550CA is available in Tape & Reel packaging, offering supply chain flexibility for high-volume applications.

Both substitutes maintain RoHS3 compliance, identical ECCN and HTSUS classifications, and MSL Level 1 rating, ensuring regulatory and environmental compatibility with the original specification.

Frequently Asked Questions (FAQ)

Q: Can P4KE550CA and P4KE550CA-B be used interchangeably with P4KE550C-B?

A: Both P4KE550CA and P4KE550CA-B are functionally equivalent substitutes within the P4KE550 series. They share the same reverse standoff voltage (495V), peak pulse current (520mA), power rating (400W), and through-hole DO-204AL package configuration. Selection between them depends on packaging requirements (Tape & Reel versus Bulk) and manufacturer preference.

Q: What is the significance of the voltage parameter differences between P4KE550C-B and P4KE550CA-B?

A: The P4KE550CA-B exhibits a lower maximum clamping voltage (760V versus 798V) and higher minimum breakdown voltage (522.5V versus 495V). These variations remain within acceptable tolerances for the P4KE550 series and do not compromise functional equivalence for general-purpose transient voltage suppression applications.

Q: Are there packaging differences between the substitute parts?

A: P4KE550CA is supplied in Tape & Reel (TR) format, while P4KE550CA-B is supplied in Bulk packaging. Both maintain identical DO-204AL / DO-41 axial through-hole package specifications. Packaging selection should align with assembly process requirements and inventory management practices.

Q: Do the substitute parts meet the same compliance standards as the original P4KE550C-B?

A: Yes. Both P4KE550CA and P4KE550CA-B are RoHS3 compliant with identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications. MSL Level 1 rating applies to all variants, indicating unlimited moisture sensitivity protection. The P4KE550CA-B is REACH unaffected, while P4KE550CA is REACH affected.

Q: Why is the P4KE550C-B classified as obsolete?

A: The P4KE550C-B has reached end-of-life status. Active substitutes P4KE550CA and P4KE550CA-B provide continued design support and supply availability for applications requiring P4KE550 series TVS diode functionality.

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