P4KE550 Equivalent & Substitute Parts

Part Overview

The P4KE550 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse, rated for 495V reverse standoff voltage with 798V maximum clamping voltage and 520mA peak pulse current. The device is housed in a DO-204AL (DO-41) axial through-hole package and is designed for general-purpose transient voltage protection applications.

The P4KE550 carries an obsolete product status. Identifying equivalent substitute parts ensures design continuity and maintains supply chain reliability for applications requiring this voltage suppression specification.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the P4KE550 are qualified based on the following critical parameters:

Voltage Rating Compatibility: Reverse standoff voltage of 495V and breakdown voltage minimum of 495V
Peak Pulse Current: 520mA (10/1000µs waveform)
Power Dissipation: 400W peak pulse power rating
Package Compatibility: DO-204AL / DO-41 axial through-hole configuration
Device Type: Unidirectional Zener TVS diode
Operating Temperature Range: Minimum -55°C to 175°C junction temperature

Substitute parts must maintain electrical equivalence across these parameters to ensure functional interchangeability in the application circuit. Clamping voltage variations within the specified range do not preclude substitution when other parameters align.

Parameter Comparison

Parameter	P4KE550 (Littelfuse)	P4KE550A (SMC Diode Solutions)	P4KE550A-AP (Micro Commercial Co)	P4KE550A-BP (Micro Commercial Co)	P4KE550A-TP (Micro Commercial Co)
Voltage - Reverse Standoff (Typ)	495V	—	495V	495V	495V
Voltage - Breakdown (Min)	495V	—	522.5V	522.5V	522.5V
Voltage - Clamping (Max) @ Ipp	798V	—	760V	760V	760V
Current - Peak Pulse (10/1000µs)	520mA	—	520mA	520mA	520mA
Power - Peak Pulse	400W	400W	400W	400W	400W
Operating Temperature Range	-55 to 175°C	-65 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute Options: P4KE550A-AP, P4KE550A-BP, and P4KE550A-TP (all manufactured by Micro Commercial Co) are functionally equivalent to the P4KE550. These parts maintain active product status, ensuring long-term availability and supply chain stability. All three variants carry identical electrical specifications and are ROHS3 compliant.

Secondary Option: P4KE550A (SMC Diode Solutions) is electrically compatible based on power rating and package configuration. However, specific voltage parameters are not provided in the datasheet documentation, requiring verification against application requirements before selection.

Compliance Considerations: All substitute parts maintain ROHS3 compliance consistent with the original P4KE550. The Micro Commercial Co variants (P4KE550A-AP, P4KE550A-BP, P4KE550A-TP) are REACH unaffected, while SMC Diode Solutions P4KE550A is REACH affected. Selection should account for regulatory requirements in the target market.

Packaging Variants: The Micro Commercial Co parts are available in bulk packaging, while SMC Diode Solutions offers tape and reel packaging. Packaging selection depends on production volume and assembly process requirements.

Frequently Asked Questions (FAQ)

Q: Can P4KE550A-AP, P4KE550A-BP, and P4KE550A-TP be used interchangeably?

A: Yes. These three Micro Commercial Co variants share identical electrical specifications (495V standoff, 760V clamping, 520mA peak pulse current, 400W power rating) and package configuration (DO-41 axial through-hole). The suffix designations (-AP, -BP, -TP) indicate packaging or tape configuration variants only and do not affect electrical performance.

Q: What is the difference between the P4KE550 clamping voltage (798V) and the substitute parts (760V)?

A: The substitute parts exhibit lower maximum clamping voltage (760V vs. 798V). Both values fall within acceptable transient suppression performance for the 495V standoff voltage class. Application circuits must verify that the 760V clamping level provides adequate protection margin for the protected circuit. This parameter difference does not preclude substitution when circuit analysis confirms compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. The P4KE550A (SMC Diode Solutions), P4KE550A-AP, P4KE550A-BP, and P4KE550A-TP (Micro Commercial Co) are all ROHS3 compliant, matching the compliance status of the original P4KE550.

Q: What is the significance of the operating temperature range difference between P4KE550 (-55 to 175°C) and P4KE550A (-65 to 175°C)?

A: The P4KE550A offers an extended lower temperature limit (-65°C vs. -55°C). This provides additional margin for applications operating in extreme cold environments. For applications within the -55 to 175°C range, both specifications are equivalent.

Q: Does packaging type affect electrical performance?

A: No. Packaging type (bulk vs. tape and reel) does not affect electrical performance. Selection is based on production volume, assembly automation requirements, and inventory management practices.

Q: Is the P4KE550 still available despite its obsolete status?

A: The original P4KE550 (Littelfuse) shows 725 pieces in stock. However, obsolete status indicates discontinued manufacturing. The active substitute parts (P4KE550A variants) ensure continued availability and are recommended for new designs and replenishment orders.

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