5KP170 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP170 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 170V reverse standoff voltage with a 288.75V maximum clamping voltage and 5000W peak pulse power rating in a through-hole P600 axial package.

The 5KP170 is classified as obsolete. Substitute parts are necessary to maintain design continuity and ensure component availability for new production and field replacements. Equivalent alternatives are available from active product lines that maintain compatible electrical and mechanical specifications.

Key Parameters

Parameter	5KP170 Value	Unit
Voltage - Reverse Standoff (Typ)	170	V
Voltage - Breakdown (Min)	179.1	V
Voltage - Clamping (Max) @ Ipp	288.75	V
Power - Peak Pulse	5000	W
Operating Temperature Range	-55 to 175	°C
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 5KP170 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): Must be 170V to maintain circuit protection threshold
Voltage - Clamping (Max) @ Ipp: Must be within the range of 275V to 288.75V to ensure adequate transient suppression
Power - Peak Pulse: Must be 5000W (5kW) or higher to handle the same energy dissipation requirements
Type: Must be Zener unidirectional TVS diode
Unidirectional Channels: Must be 1 channel
Operating Temperature Range: Must support -55°C to 175°C minimum
Mounting Type: Must be through-hole axial configuration
RoHS Compliance: Must maintain ROHS3 compliance

Substitute parts are grouped into two categories based on package compatibility:

Category A - P600 Package (Direct Package Match): 5KP170A maintains identical P600 axial packaging with improved specifications (Active product status, higher peak pulse current specification of 18.5A).

Category B - Alternative Packages (Functional Equivalents): 1.5KE and P6KE series parts provide functional voltage suppression within the specified voltage window but use different package formats (DO-201 or DO-15). These require mechanical redesign considerations but maintain electrical compatibility within the defined parameter ranges.

Parameter Comparison

Parameter	5KP170	5KP170A	1.5KE180A	1.5KE200A	1.5KE220A	P6KE180A	P6KE200A	P6KE220A	P6KE200A-AP
Voltage - Reverse Standoff (Typ)	170V	170V	154V	171V	185V	154V	171V	185V	171V
Voltage - Breakdown (Min)	179.1V	189V	171V	190V	209V	171V	190V	209V	190V
Voltage - Clamping (Max) @ Ipp	288.75V	275V	246V	274V	328V	246V	274V	328V	274V
Current - Peak Pulse (10/1000µs)	—	18.5A	6.4A	5.7A	4.8A	2.5A	2.2A	1.9A	2.2A
Power - Peak Pulse	5000W	5000W	1500W	1500W	1500W	600W	600W	600W	600W
Operating Temperature Range	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C	-50 to 175°C	-50 to 175°C	-50 to 175°C	-55 to 175°C
Package / Case	P600, Axial	P600, Axial	DO-201AA, DO-27, Axial	DO-201AA, DO-27, Axial	DO-201AA, DO-27, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	—	—	—

Engineering Selection Recommendations

Primary Recommendation: 5KP170A

The 5KP170A is the preferred direct substitute for the obsolete 5KP170. This part maintains identical P600 axial packaging, matching mechanical footprint and PCB layout requirements without redesign. The 5KP170A is in active production status with ROHS3 compliance certification. Electrical parameters remain within the specified voltage window (170V standoff, 275V clamping), and the 5000W peak pulse power rating matches the original specification. This substitute requires no circuit board modifications and provides the highest design continuity.

Secondary Recommendations: 1.5KE Series (1.5KE180A, 1.5KE200A, 1.5KE220A)

The 1.5KE series from Taiwan Semiconductor Corporation provides functional voltage suppression within the acceptable clamping voltage range (246V to 328V). These parts are in active production with ROHS3 compliance. However, the 1.5KE series operates at 1500W peak pulse power, which is lower than the original 5000W specification. These parts use DO-201 axial packaging, requiring PCB layout modifications. The 1.5KE220A carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

Tertiary Recommendations: P6KE Series (P6KE180A, P6KE200A, P6KE220A, P6KE200A-AP)

The P6KE series from Fairchild Semiconductor and Micro Commercial Co provides functional voltage suppression within the acceptable clamping voltage range (246V to 328V). These parts are in active production status. The P6KE series operates at 600W peak pulse power, significantly lower than the original 5000W specification. These parts use DO-15 (DO-204AC) axial packaging, requiring PCB layout modifications. The P6KE200A-AP variant from Micro Commercial Co includes automotive-grade designation and operates across the full -55°C to 175°C temperature range. Selection of P6KE series substitutes is appropriate only for applications where the reduced power dissipation capacity is acceptable.

Frequently Asked Questions (FAQ)

Q: Can the 5KP170A be used as a direct replacement for the 5KP170?

A: Yes. The 5KP170A maintains the same P600 axial package, reverse standoff voltage of 170V, and 5000W peak pulse power rating. No PCB modifications are required. The 5KP170A is in active production with ROHS3 compliance.

Q: What is the key difference between the 5KP170A and the 1.5KE series substitutes?

A: The 5KP170A maintains 5000W peak pulse power and P600 packaging. The 1.5KE series reduces peak pulse power to 1500W and uses DO-201 packaging, requiring PCB redesign. The 1.5KE series is suitable only for applications where reduced power dissipation is acceptable.

Q: Can P6KE series parts replace the 5KP170?

A: P6KE series parts provide voltage suppression within the acceptable clamping voltage range but operate at only 600W peak pulse power. These parts use DO-15 packaging, requiring PCB layout modifications. Selection is appropriate only for applications where the significantly reduced power capacity is acceptable.

Q: What are the voltage compatibility limits for substitution?

A: Substitute parts must maintain a reverse standoff voltage of 170V (±tolerance) and a clamping voltage between 275V and 328V to remain within the functional suppression window. The 1.5KE180A and P6KE180A operate at 154V standoff voltage, which falls outside the specified 170V requirement and should be avoided.

Q: Are all substitute parts RoHS compliant?

A: The 5KP170A, 1.5KE180A, 1.5KE200A, and 1.5KE220A carry ROHS3 compliance certification. The P6KE series parts do not specify RoHS status in the provided data. Verify RoHS compliance requirements with your design specifications before selection.

Q: Which substitute is recommended for automotive applications?

A: The 1.5KE220A carries AEC-Q101 automotive qualification. The P6KE200A-AP includes automotive-grade designation. Both are suitable for automotive applications, though the 1.5KE220A maintains higher power dissipation capacity at 1500W versus 600W for the P6KE200A-AP.

Q: Do package differences affect circuit performance?

A: Package differences do not affect electrical performance but require PCB layout modifications. The 5KP170A uses identical P600 packaging and requires no layout changes. The 1.5KE series uses DO-201 packaging, and the P6KE series uses DO-15 packaging, both requiring mechanical redesign of the PCB footprint and trace routing.

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