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

Part Overview

The 5KP17 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features a 17V reverse standoff voltage, 5000W peak pulse power rating, and P600 axial through-hole packaging. The 5KP17 is classified as obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility while meeting current procurement requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17	V
Voltage - Breakdown (Min)	17.91	V
Voltage - Clamping (Max) @ Ipp	28.98	V
Power - Peak Pulse	5000	W
Mounting Type	Through Hole	—
Package / Case	P600, Axial	—
Operating Temperature	-55 to 175	°C
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the 5KP17 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 30.5V)
Power - Peak Pulse: minimum 5000W for direct replacement; lower ratings acceptable for reduced-power applications
Unidirectional Channels: 1 (single channel required)
Type: Zener diode
Operating Temperature Range: -55°C to 175°C minimum
RoHS Compliance: ROHS3 Compliant

Package Compatibility Tiers:

Tier 1 (Direct): P600 axial package (5KP17A, SLD17U-017-B, 5KP17E3/TR13)
Tier 2 (Functional): R-6 axial package (5KP17A-TP)
Tier 3 (Reduced Power): DO-201 or DO-15 packages with lower power ratings (1.5KE18A, 1.5KE20A, P6KE20A, SA15A-B, P5KE17A-TP)

Substitutes within Tier 1 and Tier 2 maintain full electrical and mechanical compatibility. Tier 3 substitutes require application review due to reduced power dissipation capability.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Package / Case	Product Status
5KP17	Littelfuse Inc.	17	17.91	28.98	—	5000	P600, Axial	Obsolete
5KP17A	Littelfuse Inc.	17	18.9	27.6	184.8	5000	P600, Axial	Active
SLD17U-017-B	Littelfuse Inc.	17	18.9	27.6	184.8	5000	P600, Axial	Active
5KP17E3/TR13	Microchip Technology	17	18.9	30.5	164	5000	P600, Axial	Active
5KP17A-TP	Micro Commercial Co	17	18.9	27.6	—	5000	R-6, Axial	Active
1.5KE18A	Taiwan Semiconductor Corporation	15.3	17.1	25.5	60	1500	DO-201AA, DO-27, Axial	Active
1.5KE20A	Taiwan Semiconductor Corporation	17.1	19	27.7	56	1500	DO-201AA, DO-27, Axial	Active
P6KE20A	Fairchild Semiconductor	17.1	19	27.7	22	600	DO-204AC, DO-15, Axial	Active
SA15A-B	Littelfuse Inc.	15	16.7	24.4	20.9	500	DO-204AC, DO-15, Axial	Active
P5KE17A-TP	Micro Commercial Co	17	18.9	27.6	16.1	500	DO-204AC, DO-15, Axial	Active

Engineering Selection Recommendations

Recommended Direct Replacements (Tier 1 - Full Compatibility):

5KP17A (Littelfuse Inc.) is the primary direct replacement. It maintains identical reverse standoff voltage (17V), equivalent clamping voltage (27.6V), full 5000W power rating, and P600 axial packaging. Product status is active with ROHS3 compliance and unlimited moisture sensitivity level. This part provides the highest compatibility with existing PCB layouts and thermal management designs.

SLD17U-017-B (Littelfuse Inc.) offers identical electrical specifications to 5KP17A with automotive-grade qualification (AEC-Q101) and active product status. Selection of this variant is appropriate for applications requiring automotive-grade components or enhanced reliability documentation.

5KP17E3/TR13 (Microchip Technology) maintains 17V reverse standoff voltage, 5000W power rating, and P600 packaging. Clamping voltage is slightly elevated at 30.5V. Active product status and ROHS3 compliance support procurement continuity.

Alternative Replacement (Tier 2 - Package Variation):

5KP17A-TP (Micro Commercial Co) provides equivalent electrical performance with R-6 axial packaging instead of P600. This substitution requires PCB layout verification to confirm mechanical fit and thermal dissipation adequacy. Active product status and ROHS3 compliance are confirmed.

Reduced-Power Alternatives (Tier 3 - Application-Dependent):

1.5KE18A and 1.5KE20A (Taiwan Semiconductor Corporation) offer 1500W peak pulse power in DO-201 packaging. These parts are suitable only for applications where peak pulse power requirements do not exceed 1500W. Voltage parameters remain within acceptable ranges for 17V protection circuits.

P6KE20A (Fairchild Semiconductor) and SA15A-B (Littelfuse Inc.) provide 600W and 500W peak pulse power respectively in DO-15 packaging. These are appropriate for low-power transient suppression only and require explicit application validation.

P5KE17A-TP (Micro Commercial Co) maintains 17V standoff voltage with 500W power rating in DO-15 packaging. Extended operating temperature range (-65°C to 175°C) may be advantageous in specific thermal environments.

Frequently Asked Questions (FAQ)

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

A: Yes. 5KP17A is the direct replacement with identical P600 axial through-hole packaging, 17V reverse standoff voltage, and 5000W power rating. No PCB layout changes are required.

Q: What is the difference between 5KP17A and SLD17U-017-B?

A: Both parts share identical electrical specifications (17V standoff, 27.6V clamping, 5000W power, P600 package). SLD17U-017-B carries automotive-grade qualification (AEC-Q101), making it suitable for automotive applications requiring enhanced reliability documentation and traceability.

Q: Can I use 1.5KE18A or 1.5KE20A as replacements?

A: These parts are functionally compatible for voltage protection but provide only 1500W peak pulse power compared to 5000W for the 5KP17. Use only if your application's transient energy does not exceed 1500W. Package change from P600 to DO-201 requires PCB modification.

Q: What is the significance of the clamping voltage difference between 5KP17A (27.6V) and 5KP17E3/TR13 (30.5V)?

A: Both values fall within acceptable operating ranges for 17V protection circuits. The 5KP17E3/TR13 exhibits slightly higher clamping voltage, which may result in marginally higher transient voltage peaks. Select based on specific circuit protection requirements and transient energy specifications.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended Tier 1 and Tier 2 substitutes (5KP17A, SLD17U-017-B, 5KP17E3/TR13, 5KP17A-TP) are ROHS3 compliant. Tier 3 alternatives (1.5KE18A, 1.5KE20A, P6KE20A, SA15A-B, P5KE17A-TP) are also ROHS3 compliant. Verify compliance documentation for specific procurement requirements.

Q: What packaging options are available for 5KP17 substitutes?

A: Primary option is P600 axial (5KP17A, SLD17U-017-B, 5KP17E3/TR13). Alternative axial packages include R-6 (5KP17A-TP) and DO-15/DO-201 (reduced-power variants). Package selection depends on PCB layout constraints and thermal dissipation requirements.

Q: Can I mix different substitute parts in the same design?

A: Yes, provided all parts meet the application's voltage protection and power dissipation requirements. Ensure consistent sourcing and qualification documentation for production designs. Tier 1 parts (P600 package) are mechanically and electrically interchangeable. Tier 2 and Tier 3 parts require individual application validation.

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