P4KE10 Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The P4KE10 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This component features an 8.55V reverse standoff voltage, 15.23V maximum clamping voltage, and 400W peak pulse power rating in a DO-204AL (DO-41) axial package. The P4KE10 is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	8.55	V
Voltage - Breakdown (Min)	9	V
Voltage - Clamping (Max) @ Ipp	15.23	V
Current - Peak Pulse (10/1000µs)	28.3	A
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

Substitution of the P4KE10 is determined by the following critical electrical and mechanical parameters:

Voltage Rating Compatibility: Reverse standoff voltage must be 8.5V to 8.6V; breakdown voltage minimum 9V to 9.5V; clamping voltage maximum 14.4V to 15.23V
Current Handling: Peak pulse current must support the application requirement; the original P4KE10 specifies 28.3A
Power Dissipation: Peak pulse power rating must be sufficient; minimum 400W for direct equivalents
Package Compatibility: Through-hole axial mounting required; DO-204AL (DO-41), DO-15 (DO-204AC), R-6, and DO-201AE packages are acceptable based on board layout constraints
Temperature Range: Operating temperature must span -55°C to 175°C minimum
Product Status & Compliance: Active product status preferred; RoHS3 compliance required for new designs

Substitute parts are grouped into three categories: direct equivalents (P4KE10A series), higher-power alternatives (5KP and 3KP series), and lower-power alternatives (1N8151, P5KE series).

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package	Product Status	RoHS Status
P4KE10	Littelfuse Inc.	8.55	9	15.23	28.3	400	DO-204AL (DO-41)	Obsolete	ROHS3 Compliant
P4KE10A	Taiwan Semiconductor Corporation	8.55	9.5	14.5	29	400	DO-204AL (DO-41)	Active	ROHS3 Compliant
P6KE10A	Fairchild Semiconductor	8.5	9.5	14.5	43	600	DO-204AC (DO-15)	Active	Not specified
1N8151	Microchip Technology	8.5	9.5	14.5	10.3	150	Axial	Active	RoHS non-compliant
3KP8.5A-TP	Micro Commercial Co	8.5	9.44	14.4	208.3	3000	R-6	Active	Not specified
5KP8.5A-G	Comchip Technology	8.5	9.44	14.4	347.22	5000	R-6	Active	ROHS3 Compliant
5KP8.5A-TP	Micro Commercial Co	8.5	9.44	14.4	347	5000	R-6	Active	Not specified
LCE8.5A-TP	Micro Commercial Co	8.5	9.44	14.4	100	1500	DO-201AE	Active	Not specified
P4KE10A-G	Comchip Technology	8.6	9.5	14.5	27.59	400	DO-41	Active	ROHS3 Compliant
P5KE8.5A-AP	Micro Commercial Co	8.5	9.44	14.4	34.7	500	DO-15	Active	Not specified
P5KE8.5A-BP	Micro Commercial Co	8.5	9.44	14.4	34.7	500	DO-15	Active	Not specified

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement)

P4KE10A (Taiwan Semiconductor Corporation) and P4KE10A-G (Comchip Technology) are direct functional equivalents in the same DO-204AL (DO-41) package. Both maintain the 8.55V to 8.6V reverse standoff voltage and 400W power rating. P4KE10A-G offers ROHS3 compliance and active product status, making it the preferred choice for new designs requiring the original form factor.

Higher-Power Alternatives (For Enhanced Transient Protection)

The 5KP8.5A-G and 5KP8.5A-TP series provide 5000W peak pulse power in R-6 packages, suitable for applications requiring greater surge capacity. The 3KP8.5A-TP offers 3000W in the same R-6 package. These alternatives require board layout modification due to different package geometry but maintain voltage compatibility within the 8.5V to 8.6V standoff range.

Intermediate Power Alternative (DO-15 Package)

The P5KE8.5A-AP and P5KE8.5A-BP provide 500W peak pulse power in DO-15 (DO-204AC) packages, offering a middle ground between the original 400W rating and higher-power R-6 options. These are suitable for applications where package size constraints prevent R-6 adoption.

Lower-Power Alternative (Current-Limited Applications)

The 1N8151 (Microchip Technology) provides 150W peak pulse power in an axial package. This part is suitable only for applications with reduced transient current requirements and does not meet RoHS compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can P4KE10A directly replace P4KE10 without board modification?

A: Yes. P4KE10A and P4KE10A-G are pin-compatible replacements in the same DO-204AL (DO-41) package with identical lead spacing and mounting footprint. No board layout changes are required.

Q: What is the difference between P4KE10A and P4KE10A-G?

A: Both are functionally equivalent with matching voltage and power ratings. P4KE10A-G is manufactured by Comchip Technology and carries ROHS3 compliance certification. P4KE10A is manufactured by Taiwan Semiconductor Corporation and also carries ROHS3 compliance. Selection depends on supplier availability and procurement preferences.

Q: Can I use 5KP8.5A-G as a direct replacement?

A: No. While 5KP8.5A-G maintains voltage compatibility, it uses an R-6 package instead of DO-41, requiring board layout modification. The higher 5000W power rating provides enhanced protection but is unnecessary if the original 400W specification is adequate for the application.

Q: Is the 1N8151 suitable for this application?

A: The 1N8151 maintains voltage compatibility but provides only 150W peak pulse power compared to the original 400W specification. It is suitable only for applications with reduced transient current requirements. Additionally, it does not meet RoHS compliance requirements.

Q: What package options are available for substitutes?

A: Substitute parts are available in four package types: DO-204AL (DO-41) for direct replacement, DO-15 (DO-204AC) for intermediate power ratings, R-6 for high-power applications, and DO-201AE for specialized applications. Package selection depends on board layout constraints and power dissipation requirements.

Q: Are all substitute parts RoHS compliant?

A: No. P4KE10A-G, P5KE8.5A-G, and P4KE10A carry ROHS3 compliance. The 1N8151 is RoHS non-compliant. Compliance status for other substitutes is not specified in available documentation. Verify RoHS requirements with your procurement or design standards before final selection.

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

A: Most substitute parts operate from -55°C to 175°C (TJ), matching the original P4KE10 specification. P5KE8.5A-AP and P5KE8.5A-BP extend the lower limit to -65°C. P4KE10A-G and 5KP8.5A-G specify -55°C to 150°C (TJ), which is narrower than the original. Verify temperature requirements against your application specifications.

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