5KP17-B Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The 5KP17-B is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This component features a 17V reverse standoff voltage rating with 5000W peak pulse power handling capability in a P600 axial through-hole package. The 5KP17-B is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility for new designs and replacement applications.

Key Parameters

Parameter	5KP17-B
Manufacturer	Littelfuse
Type	Zener TVS Diode
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	17V
Voltage - Breakdown (Min)	17.91V
Voltage - Clamping (Max) @ Ipp	28.98V
Power - Peak Pulse	5000W (5kW)
Operating Temperature Range	-55°C ~ 175°C (TJ)
Package / Case	P600, Axial
Mounting Type	Through Hole
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 5KP17-B is determined by the following critical parameters:

Voltage Rating Compatibility: Reverse standoff voltage of 17V ±tolerance, with breakdown voltage minimum between 17.91V and 19V, and clamping voltage maximum between 27.6V and 30.5V
Power Dissipation: Peak pulse power rating of 5000W (5kW) or higher
Unidirectional Configuration: Single-channel Zener-type TVS diode
Operating Temperature Range: -55°C to 175°C minimum
Package Compatibility: P600 axial package preferred; alternative packages (DO-201, DO-15, R-6) acceptable with mechanical redesign consideration
Compliance: ROHS3 compliance required

Substitute parts are grouped into two categories:

Category A - Direct Package Equivalents (P600 Axial): Parts maintaining identical P600 package form factor with matching 5000W power rating and 17V voltage class.

Category B - Functional Equivalents (Alternative Packages): Parts with compatible electrical specifications but different package geometries, requiring PCB layout modification.

Parameter Comparison

Parameter	5KP17-B	5KP17A	5KP17A-B	SLD17U-017-B	5KP17A-TP	5KP17E3/TR13	1.5KE18A	1.5KE20A	P6KE20A
Manufacturer	Littelfuse	Littelfuse Inc.	Littelfuse	Littelfuse Inc.	Micro Commercial Co	Microchip Technology	Taiwan Semiconductor	Taiwan Semiconductor	Fairchild Semiconductor
Voltage - Reverse Standoff (Typ)	17V	17V	17V	17V	17V	17V	15.3V	17.1V	17.1V
Voltage - Breakdown (Min)	17.91V	18.9V	18.9V	18.9V	18.9V	18.9V	17.1V	19V	19V
Voltage - Clamping (Max) @ Ipp	28.98V	27.6V	27.6V	27.6V	27.6V	30.5V	25.5V	27.7V	27.7V
Current - Peak Pulse (10/1000µs)	-	184.8A	184.8A	184.8A	-	164A	60A	56A	22A
Power - Peak Pulse	5000W (5kW)	5000W (5kW)	5000W (5kW)	5000W (5kW)	5000W (5kW)	5000W (5kW)	1500W (1.5kW)	1500W (1.5kW)	600W
Operating Temperature Range	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C	-50°C ~ 175°C
Package / Case	P600, Axial	P600, Axial	P600, Axial	P600, Axial	R-6, Axial	P600, Axial	DO-201AA, DO-27, Axial	DO-201AA, DO-27, 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	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents - P600 Package)

For applications requiring identical mechanical fit and electrical performance, the following active parts provide direct substitution:

5KP17A (Littelfuse Inc., Cut Tape packaging): Maintains 17V standoff voltage, 5000W power rating, and P600 package. Active product status with established supply chain. Clamping voltage of 27.6V is within acceptable tolerance of original specification.
5KP17A-B (Littelfuse, Bulk packaging): Identical electrical specifications to 5KP17A with bulk packaging option. Active status with 833 units in stock. Suitable for high-volume production requirements.
SLD17U-017-B (Littelfuse Inc., Bulk packaging): Automotive-grade equivalent with AEC-Q101 qualification. Maintains 17V standoff, 5000W power rating, and P600 package. Recommended for automotive or mission-critical applications requiring enhanced reliability documentation.
5KP17E3/TR13 (Microchip Technology, Tape & Reel): Active product with 5000W power rating and P600 package. Clamping voltage of 30.5V is within acceptable range. Tape & Reel packaging suitable for automated assembly.

Secondary Substitutes (Alternative Packages)

5KP17A-TP (Micro Commercial Co, Cut Tape): Maintains 17V standoff and 5000W power rating but uses R-6 package instead of P600. Requires PCB layout modification. Active product status.

Lower Power Alternatives (Reduced Power Rating)

1.5KE18A (Taiwan Semiconductor Corporation, DO-201 package): 1500W power rating with 15.3V standoff voltage. Suitable only for applications with reduced transient energy requirements. Different package requires redesign.
1.5KE20A (Taiwan Semiconductor Corporation, DO-201 package): 1500W power rating with 17.1V standoff voltage. Alternative for lower-energy transient protection. DO-201 package requires PCB modification.
P6KE20A (Fairchild Semiconductor, DO-15 package): 600W power rating with 17.1V standoff voltage. Suitable only for minimal transient energy applications. Significant power derating compared to original specification.

Frequently Asked Questions (FAQ)

Q: Can 5KP17A directly replace 5KP17-B without PCB modification?

A: Yes. The 5KP17A maintains identical P600 axial package geometry, 17V voltage class, and 5000W power rating. No PCB layout changes are required. Both parts are through-hole mounted with the same lead spacing and form factor.

Q: What is the difference between 5KP17A and 5KP17A-B?

A: Both parts have identical electrical specifications and P600 packaging. The difference is packaging format: 5KP17A is supplied in Cut Tape (CT), while 5KP17A-B is supplied in Bulk. Selection depends on procurement and assembly requirements. Electrical performance is equivalent.

Q: Why is SLD17U-017-B recommended for automotive applications?

A: SLD17U-017-B carries AEC-Q101 automotive qualification and is designated as automotive-grade. This certification indicates compliance with automotive reliability and testing standards. Use this part when automotive-grade documentation and traceability are contractual requirements.

Q: Can 1.5KE18A or 1.5KE20A replace 5KP17-B?

A: These parts are functional alternatives only for applications with reduced transient energy. They provide 1500W peak pulse power versus the original 5000W specification—a 70% power reduction. Additionally, they use DO-201 packages requiring PCB redesign. Use only if circuit analysis confirms transient energy is below 1500W threshold.

Q: What is the impact of using P6KE20A as a substitute?

A: P6KE20A provides only 600W peak pulse power, representing an 88% power reduction from the original 5000W specification. The DO-15 package also requires PCB modification. This part is suitable only for minimal transient protection circuits and should not be used as a general replacement.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitutes except P6KE20A explicitly state ROHS3 compliance. P6KE20A compliance status is not specified in available documentation. Verify RoHS compliance status with the supplier if regulatory compliance is a requirement.

Q: What is the operating temperature range compatibility?

A: All substitute parts maintain the -55°C to 175°C operating temperature range except P6KE20A, which operates from -50°C to 175°C. This 5°C difference at the lower temperature limit is typically acceptable for most applications but should be verified against circuit requirements.

Q: Can I use 5KP17A-TP (R-6 package) instead of P600?

A: 5KP17A-TP is electrically equivalent but uses R-6 package instead of P600. This requires PCB layout modification to accommodate different lead spacing and form factor. Use only if PCB redesign is feasible and cost-justified.

Q: What inventory considerations apply to these substitutes?

A: 5KP17A has 3600 units in stock, 5KP17A-B has 833 units, and 1.5KE20A has 30,400 units available. For high-volume production, 1.5KE20A offers maximum availability, though power rating derating must be evaluated. Verify current inventory status with supplier before design finalization.

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