P6KE150 Equivalent & Substitute Parts

Part Overview

The P6KE150 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 128V reverse standoff voltage, 217.35V maximum clamping voltage, and 600W peak pulse power rating in a DO-204AC (DO-15) axial through-hole package. The part is currently listed as obsolete, necessitating identification of functionally equivalent alternatives from active product lines that maintain electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	P6KE150 Value	Unit
Voltage - Reverse Standoff (Typ)	128V	V
Voltage - Breakdown (Min)	135.45V	V
Voltage - Clamping (Max) @ Ipp	217.35V	V
Power - Peak Pulse	600W	W
Type	Zener	—
Unidirectional Channels	1	—
Mounting Type	Through Hole	—
Package / Case	DO-204AC, DO-15, Axial	—
Operating Temperature	-55°C ~ 175°C (TJ)	°C

Substitute Part Grouping Explanation

Substitution of the P6KE150 is determined by the following critical parameters:

Electrical Compatibility Criteria:

Voltage - Reverse Standoff (Typ): 128V ± tolerance
Voltage - Clamping (Max) @ Ipp: within acceptable range for circuit protection
Power - Peak Pulse: minimum 600W to maintain protection capability
Type: Zener diode, unidirectional configuration

Mechanical Compatibility Criteria:

Mounting Type: Through Hole
Package / Case: DO-204AC (DO-15) or equivalent axial package
Operating Temperature Range: minimum -55°C to 175°C

Substitute parts are grouped into two categories:

Category A - Direct Package Match (DO-15/DO-204AC): P6KE150A, P6KE160A, P6KE170A. These maintain identical package geometry and can be used as direct board-level replacements with voltage rating adjustments.

Category B - Enhanced Power Rating (DO-201/DO-27): 1.5KE150A, 1.5KE160A, 1.5KE170A, 5KP150A. These offer higher power dissipation (1500W or 5000W) in larger through-hole packages, suitable for applications requiring increased transient energy absorption.

Category C - Reduced Power Rating (DO-204AL/DO-41): P4KE150A, P4KE160A, P4KE170A. These provide 400W power rating in smaller DO-41 packages, applicable where space constraints exist and lower energy transients are present.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Current - Peak Pulse (10/1000µs)	Package / Case	Product Status	Operating Temperature
P6KE150	Littelfuse Inc.	128V	217.35V	600W	—	DO-204AC, DO-15	Obsolete	-55°C ~ 175°C
P6KE150A	Diotec Semiconductor	128V	207V	600W	3A	DO-204AC, DO-15	Active	-50°C ~ 175°C
P6KE160A	Fairchild Semiconductor	136V	219V	600W	2.8A	DO-204AC, DO-15	Active	-50°C ~ 175°C
P6KE170A	Fairchild Semiconductor	145V	234V	600W	2.6A	DO-204AC, DO-15	Active	-50°C ~ 175°C
1.5KE150A	Taiwan Semiconductor Corporation	128V	207V	1500W	7.6A	DO-201AA, DO-27	Active	-55°C ~ 175°C
1.5KE160A	Diotec Semiconductor	136V	219V	1500W	7.1A	DO-201AA, DO-27	Active	-50°C ~ 175°C
1.5KE170A	Taiwan Semiconductor Corporation	145V	234V	1500W	6.7A	DO-201AA, DO-27	Active	-55°C ~ 175°C
5KP150A	Littelfuse Inc.	150V	243V	5000W	21A	P600	Active	-55°C ~ 175°C
P4KE150A	Taiwan Semiconductor Corporation	128V	207V	400W	2A	DO-204AL, DO-41	Active	-55°C ~ 175°C
P4KE160A	Taiwan Semiconductor Corporation	136V	219V	400W	1.9A	DO-204AL, DO-41	Active	-55°C ~ 175°C
P4KE170A	Taiwan Semiconductor Corporation	145V	234V	400W	1.8A	DO-204AL, DO-41	Active	-55°C ~ 175°C

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

P6KE150A (Diotec Semiconductor) is the preferred direct substitute. It maintains identical reverse standoff voltage (128V), equivalent clamping voltage (207V vs. 217.35V), matching 600W power rating, and identical DO-15 package geometry. Product status is active with ROHS3 compliance. Operating temperature range is -50°C to 175°C, which covers most industrial applications, though the lower minimum temperature (-50°C vs. -55°C) should be verified for extreme cold-weather applications.

Secondary Substitutes (Voltage-Adjusted Alternatives):

P6KE160A and P6KE170A provide higher voltage ratings (136V and 145V standoff respectively) while maintaining 600W power dissipation and DO-15 package compatibility. These are suitable for circuits requiring higher transient voltage suppression thresholds. Both are active products from Fairchild Semiconductor.

Higher Power Alternatives (Enhanced Protection):

1.5KE150A, 1.5KE160A, and 1.5KE170A offer 1500W peak pulse power in DO-27 packages. These are appropriate for applications experiencing higher energy transients or where increased safety margin is required. 1.5KE150A and 1.5KE170A maintain full temperature range (-55°C to 175°C) with ROHS3 compliance.

5KP150A (Littelfuse Inc.) provides maximum power dissipation (5000W) in P600 package for high-energy transient environments. This option is suitable only where board space permits larger package footprint.

Lower Power Alternatives (Space-Constrained Applications):

P4KE150A, P4KE160A, and P4KE170A deliver 400W power in compact DO-41 packages. These are applicable only where transient energy levels are confirmed to be below 400W and space constraints are critical. All three maintain full -55°C to 175°C operating range with ROHS3 compliance.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance and EAR99 export classification. Moisture sensitivity level is 1 (Unlimited) for all active alternatives, matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can P6KE150A be used as a direct replacement for P6KE150?

A: Yes. P6KE150A is the direct substitute, maintaining 128V reverse standoff voltage, 600W power rating, and DO-15 package. The clamping voltage is 207V compared to 217.35V in the original, which is within acceptable suppression range. Operating temperature minimum is -50°C instead of -55°C; verify this meets your application requirements.

Q: What is the difference between P6KE, 1.5KE, and P4KE series?

A: These represent different power ratings and package sizes. P6KE series provides 600W in DO-15 packages. 1.5KE series offers 1500W in larger DO-27 packages. P4KE series delivers 400W in smaller DO-41 packages. Selection depends on transient energy levels and available board space.

Q: Can I use a 1.5KE150A instead of P6KE150 in my circuit?

A: Yes, if board layout permits the larger DO-27 package. The 1.5KE150A maintains identical 128V reverse standoff voltage and provides higher power dissipation (1500W vs. 600W), offering increased protection margin. This is a conservative upgrade suitable for applications where transient energy may exceed 600W.

Q: Are voltage-rated variants (160A, 170A) interchangeable with 150A?

A: No. These represent different voltage ratings. P6KE150A has 128V standoff, P6KE160A has 136V, and P6KE170A has 145V. Selection must match your circuit's nominal voltage and transient suppression requirements. Using a higher-rated variant may reduce protection effectiveness; using a lower-rated variant risks component failure.

Q: What is the significance of the "A" suffix in part numbers?

A: The "A" suffix indicates a specific voltage tolerance grade and performance specification within the series. All listed substitutes include this suffix, indicating they meet the same tolerance and performance standards as the original P6KE150.

Q: Can P4KE150A replace P6KE150 in all applications?

A: Only if your application's peak transient energy is confirmed below 400W. The P4KE150A provides lower power dissipation (400W vs. 600W) in a smaller DO-41 package. This is a downgrade suitable only for low-energy transient environments or space-critical designs. Verify transient specifications before selection.

Q: Are all substitutes ROHS3 compliant?

A: All active product substitutes listed maintain ROHS3 compliance. This matches the original P6KE150 specification and ensures compatibility with modern manufacturing and environmental regulations.

Q: What is the operating temperature range difference between substitutes?

A: Most substitutes operate from -55°C to 175°C, matching the original. P6KE150A, P6KE160A, P6KE170A, 1.5KE160A, and P6KE170A have a minimum of -50°C instead of -55°C. Verify this meets your application's cold-temperature requirements before selection.

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