P4KE15 Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The P4KE15 is a unidirectional Zener transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 12.8V reverse standoff voltage, 22.26V maximum clamping voltage, and 400W peak pulse power rating in a through-hole DO-204AL (DO-41) package. The part is currently listed as obsolete, necessitating identification of functionally equivalent active alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	12.8	V
Voltage - Breakdown (Min)	14.65	V
Voltage - Clamping (Max) @ Ipp	22.26	V
Current - Peak Pulse (10/1000µs)	19.3	A
Power - Peak Pulse	400	W
Package / Case	DO-204AL, DO-41, Axial	—
Mounting Type	Through Hole	—
Operating Temperature	-55°C ~ 175°C (TJ)	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the P4KE15 is determined by the following critical parameters:

Voltage Compatibility: Reverse standoff voltage must be 12.8V (±tolerance), with breakdown voltage minimum of 14.65V and clamping voltage maximum of 22.26V at peak pulse current. These parameters define the protection threshold and response characteristics.

Current & Power Rating: Peak pulse current must be at or above 19.3A (10/1000µs), with peak pulse power at or above 400W. Higher ratings provide margin and extended operational life.

Package & Mounting: Through-hole axial packages (DO-204AL/DO-41, DO-204AC/DO-15, or DO-201/DO-27) are mechanically compatible with the original PCB footprint. Package selection affects thermal performance and current handling capacity.

Electrical Type & Configuration: Unidirectional Zener diode with single channel configuration.

Environmental Compliance: ROHS3 compliance and operating temperature range -55°C to 175°C (TJ) are required for regulatory and thermal compatibility.

Substitute parts are grouped into two categories: direct package equivalents (DO-204AL/DO-41) and higher-power alternatives (DO-15 and DO-201 packages) that provide enhanced performance margins.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Clamping (Max) @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package / Case	Product Status	RoHS Status
P4KE15	Littelfuse Inc.	12.8	22.26	19.3	400	DO-204AL (DO-41)	Obsolete	ROHS3 Compliant
P4KE15A	Taiwan Semiconductor Corporation	12.8	21.2	20	400	DO-204AL (DO-41)	Active	ROHS3 Compliant
P4KE16A	Taiwan Semiconductor Corporation	13.6	22.5	18.6	400	DO-204AL (DO-41)	Active	ROHS3 Compliant
P6KE15A	Fairchild Semiconductor	12.8	21.2	29	600	DO-204AC (DO-15)	Active	Not Specified
P6KE16A	Diotec Semiconductor	13.6	22.5	28	600	DO-204AC (DO-15)	Active	ROHS3 Compliant
1.5KE15A	Taiwan Semiconductor Corporation	12.8	21.2	74	1500	DO-201 (DO-27)	Active	ROHS3 Compliant
1.5KE16A	Taiwan Semiconductor Corporation	13.6	22.5	70	1500	DO-201 (DO-27)	Active	ROHS3 Compliant
SA12A-B	Littelfuse Inc.	12	19.9	25.6	500	DO-204AC (DO-15)	Active	ROHS3 Compliant
SA13A	Fairchild Semiconductor	13	21.5	23.7	500	DO-204AC (DO-15)	Obsolete	ROHS3 Compliant
SA14A	Fairchild Semiconductor	14	23.2	22	500	DO-204AC (DO-15)	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

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

P4KE15A from Taiwan Semiconductor Corporation is the primary direct substitute. It maintains identical reverse standoff voltage (12.8V), equivalent clamping voltage (21.2V), and matching 400W power rating in the same DO-204AL package. Peak pulse current is 20A, exceeding the original 19.3A specification. Product status is active with ROHS3 compliance, ensuring long-term availability and regulatory conformance.

P4KE16A provides an alternative with slightly elevated voltage ratings (13.6V standoff, 22.5V clamping) in the same package. This part is suitable when circuit design permits higher voltage thresholds. Active status and ROHS3 compliance are confirmed.

Enhanced Performance Alternatives (DO-15 Package):

P6KE15A and P6KE16A offer 600W peak pulse power in the DO-204AC (DO-15) package, providing 50% power margin over the original specification. These parts accommodate higher transient energy absorption. P6KE15A matches the 12.8V standoff voltage; P6KE16A provides 13.6V. Both are active products. Note: P6KE15A RoHS status is not specified in available data.

SA12A-B from Littelfuse Inc. (the original manufacturer) provides 500W power in DO-15 package with active product status and ROHS3 compliance. Standoff voltage is 12V (slightly lower than 12.8V), suitable for applications with lower voltage thresholds.

Maximum Power Alternatives (DO-201 Package):

1.5KE15A and 1.5KE16A deliver 1500W peak pulse power in the larger DO-201 (DO-27) package. These are appropriate for high-energy transient environments requiring substantial margin. Both are active products with ROHS3 compliance. 1.5KE15A maintains 12.8V standoff; 1.5KE16A provides 13.6V.

Obsolete Alternatives (Not Recommended for New Designs):

SA13A and SA14A are obsolete products and should not be selected for new production designs, despite meeting electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can P4KE15A be used as a direct replacement for P4KE15?

A: Yes. P4KE15A is the recommended direct substitute. It maintains the same reverse standoff voltage (12.8V), equivalent clamping voltage (21.2V), and identical 400W power rating in the DO-204AL package. Peak pulse current is 20A, exceeding the original 19.3A. The part is active and ROHS3 compliant.

Q: What is the difference between DO-204AL and DO-204AC packages?

A: DO-204AL (DO-41) is a smaller axial package used in P4KE15 and P4KE15A. DO-204AC (DO-15) is a larger axial package used in P6KE and SA series parts. Both are through-hole, axial-lead components, but DO-15 provides better thermal dissipation and higher current handling due to larger lead diameter and body size. PCB footprints differ; verify compatibility before substitution.

Q: Can I use a higher-power part like 1.5KE15A instead of P4KE15?

A: Yes, if PCB layout accommodates the larger DO-201 package. The 1.5KE15A provides identical voltage characteristics (12.8V standoff, 21.2V clamping) with 1500W power rating, offering substantial margin for high-energy transient environments. Verify mechanical fit and thermal management requirements before implementation.

Q: Are all substitute parts ROHS3 compliant?

A: Most are. P4KE15A, P4KE16A, P6KE16A, 1.5KE15A, 1.5KE16A, SA12A-B, SA13A, and SA14A are confirmed ROHS3 compliant. P6KE15A RoHS status is not specified in available documentation; verify with the supplier before procurement.

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

A: The original P4KE15 and most substitutes operate from -55°C to 175°C (junction temperature). This range is suitable for industrial and automotive applications. Verify specific part datasheets for any deviations.

Q: Can I substitute a part with higher voltage rating (e.g., P4KE16A instead of P4KE15)?

A: Substitution is possible only if circuit design permits higher voltage thresholds. P4KE16A has 13.6V standoff and 22.5V clamping versus P4KE15's 12.8V and 22.26V. This increases the voltage at which the TVS begins conducting, potentially allowing higher transient voltages to reach protected circuitry. Verify circuit tolerance before substitution.

Q: Why are SA13A and SA14A listed as obsolete?

A: These parts are no longer in active production. While they meet electrical parameters, they should not be selected for new designs due to uncertain long-term availability and potential supply discontinuation. Use active alternatives instead.

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