5KP17C-B Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The 5KP17C-B is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 17V reverse standoff voltage, 28.98V maximum clamping voltage, and 5000W peak pulse power rating in a through-hole P600 axial package. The product is currently obsolete, necessitating identification of functionally equivalent active alternatives that maintain electrical and mechanical compatibility for circuit protection requirements.

Key Parameters

Parameter	5KP17C-B
Manufacturer	Littelfuse Inc.
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Bidirectional 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	-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 of the 5KP17C-B is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff: 17V nominal
Voltage - Clamping (Max) @ Ipp: within acceptable range (27.6V to 28.98V)
Power - Peak Pulse: 5000W minimum
Bidirectional operation: 1 channel
Mounting Type: Through Hole
Package compatibility: P600 axial preferred; DO-201 and DO-15 packages acceptable with mechanical adaptation

Substitution Groups:

Group 1 - Direct P600 Package Equivalents (Preferred): Parts maintaining identical P600 axial package and 5000W power rating with matching voltage specifications.

Group 2 - Alternative Package Equivalents (Lower Power Rating): Parts with different package types (DO-201, DO-15) and reduced power ratings (1500W, 600W) but compatible voltage characteristics for applications with lower transient energy requirements.

Parameter Comparison

Parameter	5KP17C-B	5KP17CA	5KP17CA-B	SLD17-018-B	1.5KE18CA	1.5KE20CA	P6KE18CA	P6KE20CA	SA15CA	SA15CA-B
Manufacturer	Littelfuse	Littelfuse	Littelfuse	Littelfuse	Taiwan Semi	Taiwan Semi	Diotec	Fairchild	Taiwan Semi	Littelfuse
Voltage - Reverse Standoff (Typ)	17V	17V	17V	17V	15.3V	17.1V	15.3V	17.1V	15V	15V
Voltage - Breakdown (Min)	17.91V	18.9V	18.9V	18.9V	17.1V	19V	17.1V	19V	16.7V	16.7V
Voltage - Clamping (Max) @ Ipp	28.98V	27.6V	27.6V	27.6V	25.5V	27.7V	25.2V	27.7V	24.4V	24.4V
Current - Peak Pulse (10/1000µs)	—	184.8A	184.8A	184.8A	60A	56A	25A	22A	21A	20.9A
Power - Peak Pulse	5000W	5000W	5000W	5000W	1500W	1500W	600W	600W	500W	500W
Operating Temperature	-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	-50°C ~ 175°C	-55°C ~ 175°C	-55°C ~ 175°C
Package / Case	P600, Axial	P600, Axial	P600, Axial	P600, 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
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not applicable	Not specified	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended):

5KP17CA and 5KP17CA-B are the primary substitutes for 5KP17C-B. Both maintain identical electrical specifications (17V standoff, 27.6V clamping, 5000W power rating), P600 axial package, and operating temperature range. Both are active products with ROHS3 compliance. The distinction between these parts is packaging format: 5KP17CA is supplied in Cut Tape (CT), while 5KP17CA-B is supplied in Bulk. Selection depends on procurement and assembly requirements.

SLD17-018-B is an automotive-grade alternative (AEC-Q101 qualified) with identical electrical and package specifications. This part is suitable for applications requiring automotive qualification or enhanced reliability standards.

Tier 2 - Functional Equivalents with Package Variation:

1.5KE18CA and 1.5KE20CA (Taiwan Semiconductor Corporation) provide equivalent voltage protection in DO-201 axial packages with reduced power rating (1500W). These parts are suitable for applications where transient energy levels are lower than the original 5000W specification. Both maintain ROHS3 compliance and active product status.

P6KE18CA (Diotec Semiconductor) and P6KE20CA (Fairchild Semiconductor) offer 600W power rating in DO-15 axial packages. These are appropriate for low-energy transient suppression applications. Note that P6KE18CA RoHS status is not applicable, and P6KE20CA RoHS compliance is not specified.

Tier 3 - Lower Voltage Alternatives:

SA15CA and SA15CA-B provide 15V standoff voltage with 500W power rating in DO-15 packages. These parts are suitable only for applications with lower voltage thresholds and reduced transient energy requirements.

Compliance Considerations:

All Tier 1 and Tier 2 substitutes from Littelfuse and Taiwan Semiconductor Corporation maintain ROHS3 compliance. Applications requiring automotive qualification should specify SLD17-018-B. For general industrial applications, 5KP17CA or 5KP17CA-B provide direct electrical and mechanical equivalence.

Frequently Asked Questions (FAQ)

Q: Can 5KP17CA directly replace 5KP17C-B without circuit modification?

A: Yes. 5KP17CA maintains identical electrical parameters (17V standoff, 27.6V clamping, 5000W power rating) and P600 axial package configuration. No circuit modifications are required. The primary difference is product status: 5KP17C-B is obsolete while 5KP17CA is active.

Q: What is the difference between 5KP17CA and 5KP17CA-B?

A: Both parts are electrically identical with matching specifications. The difference is packaging format: 5KP17CA is supplied in Cut Tape (CT) for automated assembly, while 5KP17CA-B is supplied in Bulk for manual assembly or alternative handling. Selection depends on manufacturing process requirements.

Q: Can I use 1.5KE18CA or 1.5KE20CA as replacements?

A: These parts provide equivalent voltage protection but with reduced power rating (1500W versus 5000W) and different package type (DO-201 versus P600). They are suitable only if the application's transient energy is confirmed to be below 1500W. DO-201 packages require different PCB footprints than P600.

Q: What is the difference between P6KE18CA and P6KE20CA?

A: P6KE18CA has 15.3V standoff voltage with 25.5V clamping, while P6KE20CA has 17.1V standoff voltage with 27.7V clamping. Both provide 600W power rating in DO-15 packages. P6KE20CA more closely matches the original 5KP17C-B voltage specifications but with significantly reduced power handling.

Q: Is SLD17-018-B suitable for automotive applications?

A: Yes. SLD17-018-B is AEC-Q101 qualified and designated as automotive grade. It maintains identical electrical specifications to 5KP17CA and 5KP17CA-B while meeting automotive reliability standards. Use this part for automotive or safety-critical applications.

Q: What are the package compatibility considerations?

A: The original 5KP17C-B uses P600 axial package. Direct replacements (5KP17CA, 5KP17CA-B, SLD17-018-B) use identical P600 packages and are pin-compatible. Alternative packages (DO-201, DO-15) require different PCB footprints and cannot be used as direct drop-in replacements without board redesign.

Q: Are all substitute parts ROHS3 compliant?

A: Most substitutes are ROHS3 compliant. P6KE18CA (Diotec) has not applicable RoHS status, and P6KE20CA (Fairchild) compliance is not specified. For applications requiring ROHS3 certification, use Littelfuse or Taiwan Semiconductor Corporation parts.

Q: What inventory levels are available for each substitute?

A: 5KP17CA has 1102 pcs in stock, 5KP17CA-B has 858 pcs, SLD17-018-B has 1070 pcs, 1.5KE18CA has 12300 pcs, 1.5KE20CA has 15100 pcs, P6KE18CA has 20587 pcs, P6KE20CA has 38300 pcs, SA15CA has 16100 pcs, and SA15CA-B has 721 pcs available.

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