P4KE16A-B Equivalent & Substitute Parts

Part Overview

The P4KE16A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in through-hole applications. This component features a 13.6V reverse standoff voltage, 22.5V maximum clamping voltage, and 400W peak pulse power rating in a DO-204AL (DO-41) axial package. The part is currently active and ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical performance parameters and compatible package configurations for direct circuit board replacement.

Key Parameters

Parameter	P4KE16A-B
Voltage - Reverse Standoff (Typ)	13.6V
Voltage - Breakdown (Min)	15.2V
Voltage - Clamping (Max) @ Ipp	22.5V
Current - Peak Pulse (10/1000µs)	18.2A
Power - Peak Pulse	400W
Package / Case	DO-204AL, DO-41, Axial
Operating Temperature	-55°C ~ 175°C (TJ)
Type	Zener
Unidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the P4KE16A-B are grouped based on the following substitution criteria:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 12.8V to 14V range
Voltage - Clamping (Max) @ Ipp: 19.9V to 23.2V range
Current - Peak Pulse (10/1000µs): Minimum 18.2A
Power - Peak Pulse: Minimum 400W
Type: Zener, Unidirectional
Mounting Type: Through Hole
Operating Temperature: -55°C minimum to 175°C maximum

Package Compatibility:

Primary: DO-204AL (DO-41) axial package
Secondary: DO-204AC (DO-15) axial package (compatible footprint with minor lead spacing variation)

Substitute parts meeting these electrical and mechanical parameters can be used as direct replacements in circuit applications requiring transient voltage suppression at the specified voltage levels.

Parameter Comparison

Parameter	P4KE16A-B (Littelfuse)	P4KE16A (Taiwan Semi)	1.5KE15A (Taiwan Semi)	P6KE15A (Fairchild)	SA14A (Fairchild)	SA12A (Fairchild)
Voltage - Reverse Standoff (Typ)	13.6V	13.6V	12.8V	12.8V	14V	12V
Voltage - Breakdown (Min)	15.2V	15.2V	14.3V	14.3V	15.6V	13.3V
Voltage - Clamping (Max) @ Ipp	22.5V	22.5V	21.2V	21.2V	23.2V	19.9V
Current - Peak Pulse (10/1000µs)	18.2A	18.6A	74A	29A	22A	25.1A
Power - Peak Pulse	400W	400W	1500W	600W	500W	500W
Package / Case	DO-204AL, DO-41	DO-204AL, DO-41	DO-201AA, DO-27	DO-204AC, DO-15	DO-204AC, DO-15	DO-204AC, DO-15
Operating Temperature	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-50°C ~ 175°C	-55°C ~ 175°C	Not specified
Product Status	Active	Active	Active	Active	Obsolete	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Preferred Direct Replacement: P4KE16A (Taiwan Semiconductor Corporation) provides identical electrical specifications and package configuration to the P4KE16A-B. Both components feature 13.6V reverse standoff voltage, 22.5V clamping voltage, and 400W peak pulse power in DO-204AL (DO-41) packages. This part is active and ROHS3 compliant, making it the optimal equivalent for direct substitution.

Alternative Substitutes with Package Compatibility: P6KE15A (Fairchild Semiconductor) and SA14A (Fairchild Semiconductor) are compatible substitutes with DO-204AC (DO-15) package configurations. These parts operate within the specified voltage and current ranges. P6KE15A is currently active with higher peak pulse power (600W) and peak current (29A) capability. SA14A is obsolete and should be avoided for new designs.

Higher Power Alternative: 1.5KE15A (Taiwan Semiconductor Corporation) offers significantly higher power dissipation (1500W) and peak current (74A) in a DO-201AA (DO-27) package. This part is suitable for applications requiring enhanced transient protection but requires PCB layout modification due to different package geometry.

Parts to Avoid: SA12A (Fairchild Semiconductor) is obsolete with lower clamping voltage (19.9V) and should not be selected for new applications.

Frequently Asked Questions (FAQ)

Q: Can P4KE16A replace P4KE16A-B directly? A: Yes. P4KE16A from Taiwan Semiconductor Corporation provides identical electrical parameters and package configuration. Both are active products with ROHS3 compliance.

Q: What is the difference between DO-204AL and DO-204AC packages? A: DO-204AL (DO-41) and DO-204AC (DO-15) are both axial through-hole packages with different lead spacing. DO-204AL has 0.400 inch lead spacing, while DO-204AC has 0.300 inch spacing. PCB footprint modification is required when substituting between these packages.

Q: Can I use 1.5KE15A as a substitute? A: 1.5KE15A meets the electrical substitution criteria with superior power handling (1500W vs 400W). However, it uses a DO-201AA (DO-27) package requiring different PCB hole spacing and lead diameter. Physical board modification is necessary.

Q: Why are SA12A and SA14A listed as obsolete? A: These Fairchild Semiconductor parts are no longer in active production. SA12A additionally has lower clamping voltage (19.9V) below the specified range. New designs should use active products.

Q: What are the key parameters for substitution compatibility? A: Reverse standoff voltage (12.8V to 14V), clamping voltage (19.9V to 23.2V), peak pulse current (minimum 18.2A), and peak pulse power (minimum 400W) determine substitution viability. Package type and operating temperature range must also be compatible with circuit requirements.

Q: Is RoHS compliance required for substitution? A: RoHS3 compliance is specified for the P4KE16A-B. Substitute parts should maintain this compliance for regulatory consistency. P4KE16A, 1.5KE15A, SA14A, and SA12A are all ROHS3 compliant. P6KE15A compliance status is not specified in available data.

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