Equivalent & Substitute Parts for 5KP170-B

Part Overview

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

The 5KP170-B is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	5KP170-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener, Unidirectional
Voltage - Reverse Standoff (Typ)	170V
Voltage - Breakdown (Min)	179.1V
Voltage - Clamping (Max) @ Ipp	288.75V
Power - Peak Pulse	5000W (5kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the 5KP170-B is determined by the following critical parameters:

Voltage - Reverse Standoff: 170V nominal
Voltage - Clamping (Max) @ Ipp: Range 275V to 328V
Power - Peak Pulse: Minimum 1500W
Type: Zener, Unidirectional
Mounting Type: Through Hole
Operating Temperature: -55°C minimum to 175°C maximum
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category 1: Direct Littelfuse Equivalents (Same Manufacturer, P600 Package)

5KP170A and 5KP170A-B maintain identical reverse standoff voltage (170V) and package form factor with active product status and improved availability.

Category 2: Cross-Manufacturer Alternatives (Different Package, Comparable Performance)

1.5KE series (Taiwan Semiconductor Corporation, DO-201 package): Lower power rating (1500W) but compatible voltage ranges.
P4KE series (Taiwan Semiconductor Corporation, DO-204AL package): Lower power rating (400W) with compatible voltage specifications.
P6KE series (Fairchild Semiconductor, DO-204AC package): 600W power rating with compatible voltage ranges.
SA160A (Fairchild Semiconductor, DO-204AC package): Obsolete status, 500W power rating, compatible voltage range.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
5KP170-B	Littelfuse Inc.	170V	179.1V	288.75V	5000W	P600, Axial	Obsolete	ROHS3 Compliant
5KP170A	Littelfuse Inc.	170V	189V	275V	5000W	P600, Axial	Active	ROHS3 Compliant
5KP170A-B	Littelfuse Inc.	170V	189V	275V	5000W	P600, Axial	Active	ROHS3 Compliant
1.5KE180A	Taiwan Semiconductor Corporation	154V	171V	246V	1500W	DO-201AA, Axial	Active	ROHS3 Compliant
1.5KE200A	Taiwan Semiconductor Corporation	171V	190V	274V	1500W	DO-201AA, Axial	Active	ROHS3 Compliant
1.5KE220A	Taiwan Semiconductor Corporation	185V	209V	328V	1500W	DO-201AA, Axial	Active	ROHS3 Compliant
P4KE180A	Taiwan Semiconductor Corporation	154V	171V	246V	400W	DO-204AL, Axial	Active	ROHS3 Compliant
P6KE180A	Fairchild Semiconductor	154V	171V	246V	600W	DO-204AC, Axial	Active	Not specified
P6KE200A	Fairchild Semiconductor	171V	190V	274V	600W	DO-204AC, Axial	Active	Not specified
P6KE220A	Fairchild Semiconductor	185V	209V	328V	600W	DO-204AC, Axial	Active	Not specified
SA160A	Fairchild Semiconductor	160V	178V	259V	500W	DO-204AC, Axial	Obsolete	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended)

The 5KP170A and 5KP170A-B are the preferred substitutes for the 5KP170-B. Both parts maintain identical reverse standoff voltage (170V), identical package form factor (P600, Axial), and identical power rating (5000W). Both are active products with ROHS3 compliance and REACH unaffected status, ensuring long-term supply chain availability and regulatory compliance. The 5KP170A is available in Cut Tape packaging, while the 5KP170A-B is available in Bulk packaging.

Secondary Substitutes (Cross-Manufacturer, Different Package)

Cross-manufacturer alternatives are suitable when package form factor change is acceptable:

1.5KE200A (Taiwan Semiconductor Corporation): Provides 171V reverse standoff voltage and 274V clamping voltage in DO-201 package. Power rating is reduced to 1500W. Active product status with ROHS3 compliance.
P6KE200A (Fairchild Semiconductor): Provides 171V reverse standoff voltage and 274V clamping voltage in DO-204AC package. Power rating is 600W. Active product status with high inventory availability (165,200 pcs).
P6KE220A (Fairchild Semiconductor): Provides 185V reverse standoff voltage and 328V clamping voltage in DO-204AC package. Power rating is 600W. Active product status with substantial inventory (25,300 pcs).

Obsolete Alternatives (Not Recommended for New Designs)

SA160A is classified as obsolete and should not be selected for new designs despite active inventory. The 5KP170-B itself is obsolete; migration to active products (5KP170A or 5KP170A-B) is required.

Frequently Asked Questions (FAQ)

Q: Can 5KP170A directly replace 5KP170-B without circuit modification?

A: Yes. The 5KP170A and 5KP170A-B maintain identical reverse standoff voltage (170V), identical package (P600, Axial), and identical power rating (5000W). Both are pin-compatible and functionally equivalent. The primary difference is product status: 5KP170A and 5KP170A-B are active products with improved availability.

Q: What is the difference between 5KP170A and 5KP170A-B?

A: Both parts are electrically identical. The difference is packaging: 5KP170A is supplied in Cut Tape (CT) packaging, while 5KP170A-B is supplied in Bulk packaging. Selection depends on procurement and assembly requirements.

Q: Can I use 1.5KE200A as a substitute if power dissipation is not critical?

A: 1.5KE200A can be used if the application power dissipation requirement does not exceed 1500W. The reverse standoff voltage (171V) and clamping voltage (274V) are compatible with the 5KP170-B specification. However, the package changes from P600 (Axial) to DO-201 (Axial), requiring PCB layout modification. This substitute is suitable only when package change is acceptable and power requirements are confirmed below 1500W.

Q: Why is P6KE200A listed as a substitute despite lower power rating?

A: P6KE200A provides compatible voltage specifications (171V reverse standoff, 274V clamping) and is an active product with high inventory availability. It is listed as a secondary substitute for applications where 600W power dissipation is sufficient. The package changes from P600 to DO-204AC, requiring PCB layout modification. This substitute is suitable only when power requirements do not exceed 600W and package change is acceptable.

Q: What are the key parameters that determine substitutability?

A: Substitutability is determined by: (1) Reverse Standoff Voltage within the 170V nominal range, (2) Clamping Voltage (Max) within acceptable range for the application, (3) Power Rating sufficient for application requirements, (4) Unidirectional Zener type, (5) Through-hole mounting capability, (6) Operating temperature range -55°C to 175°C minimum, and (7) ROHS3 compliance for regulatory requirements.

Q: Is package compatibility required for substitution?

A: Package compatibility depends on application requirements. Direct substitutes (5KP170A, 5KP170A-B) maintain the P600 package and require no PCB modification. Cross-manufacturer alternatives (1.5KE, P4KE, P6KE series) use different packages (DO-201, DO-204AL, DO-204AC) and require PCB layout modification. Package selection must be confirmed with circuit design and assembly capabilities.

Q: Are all substitute parts ROHS3 compliant?

A: The 5KP170A, 5KP170A-B, 1.5KE series, P4KE series, and SA160A are confirmed ROHS3 compliant. P6KE series RoHS status is not specified in the provided data. Regulatory compliance must be confirmed with the component supplier before final selection.

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