Equivalent & Substitute Parts for 3KP17C-B TVS Diode

Part Overview

The 3KP17C-B is a Littelfuse transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This bidirectional Zener diode features a 17V reverse standoff voltage and 28.98V maximum clamping voltage with 108.7A peak pulse current capability in a through-hole P600 axial package. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts maintain the core electrical characteristics while offering improved availability and active product status.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	17	V
Voltage - Breakdown (Min)	17.91	V
Voltage - Clamping (Max) @ Ipp	28.98	V
Current - Peak Pulse (10/1000µs)	108.7	A
Power - Peak Pulse	3000	W
Operating Temperature Range	-55 to 175	°C (TJ)
Mounting Type	Through Hole	-
Package / Case	P600, Axial	-
Type	Zener	-
Bidirectional Channels	1	-

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP17C-B is determined by the following critical parameters:

Voltage Rating Match: Reverse standoff voltage of 17V and breakdown voltage minimum of 17.91V
Clamping Voltage Compatibility: Maximum clamping voltage within acceptable range (27.6V to 29.3V)
Package Compatibility: Through-hole axial mounting (P600 or R-6 packages)
Temperature Range: Operating range of -55°C to 175°C (TJ)
Bidirectional Configuration: Single-channel Zener diode type
Compliance: ROHS3 compliant with MSL rating of 1 (Unlimited)

The three qualified substitutes meet these criteria while offering improved product status (Active vs. Obsolete) and enhanced power handling or current capabilities.

Parameter Comparison

Parameter	3KP17C-B (Main)	5KP17CA-B	15KP17CA-TP	15KPA17CAE3/TR13
Manufacturer	Littelfuse	Littelfuse Inc.	Micro Commercial Co	Microchip Technology
Product Status	Obsolete	Active	Active	Active
Voltage - Reverse Standoff (Typ)	17V	17V	17V	17V
Voltage - Breakdown (Min)	17.91V	18.9V	18.9V	18.99V
Voltage - Clamping (Max) @ Ipp	28.98V	27.6V	29.3V	29.3V
Current - Peak Pulse (10/1000µs)	108.7A	184.8A	-	515.4A
Power - Peak Pulse	3000W	5000W	15000W	15000W
Operating Temperature	-55 to 175°C	-55 to 175°C	-55 to 175°C	-55 to 175°C
Package / Case	P600, Axial	P600, Axial	R-6, Axial	P600, Axial
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

5KP17CA-B (Littelfuse Inc.) - Direct replacement from the same manufacturer. Maintains P600 package compatibility and identical voltage ratings. Offers 5kW peak pulse power (67% increase) and 184.8A peak pulse current (70% increase) compared to the main part. Active product status ensures long-term availability. Suitable for applications requiring equivalent or enhanced transient protection within the same form factor.

15KP17CA-TP (Micro Commercial Co) - Alternative source with R-6 axial package. Delivers 15kW peak pulse power (400% increase) with identical voltage ratings. Package change from P600 to R-6 requires PCB layout verification. Active product status and ROHS3 compliance maintained. Recommended for designs where higher energy dissipation capability is beneficial and package footprint adjustment is feasible.

15KPA17CAE3/TR13 (Microchip Technology) - Highest performance option with 15kW peak pulse power and 515.4A peak pulse current. Maintains P600 package compatibility with the main part. Tape & Reel packaging (TR13) supports automated assembly. Active product status with ROHS3 and REACH compliance. Optimal choice for applications requiring maximum transient suppression capability within the original package footprint.

All substitutes maintain ROHS3 compliance, MSL rating of 1 (Unlimited), and operating temperature range of -55°C to 175°C (TJ), ensuring regulatory and environmental compatibility with the original design.

Frequently Asked Questions (FAQ)

Q: Can 5KP17CA-B be used as a direct drop-in replacement for 3KP17C-B?

A: Yes. Both parts share identical voltage ratings (17V reverse standoff, 17.91V minimum breakdown), P600 axial package, and through-hole mounting. The 5KP17CA-B provides higher peak pulse power (5kW vs. 3kW) and current (184.8A vs. 108.7A), making it functionally compatible and capable of handling equivalent or greater transient events.

Q: What is the difference between P600 and R-6 packages?

A: Both are through-hole axial packages for TVS diodes. P600 and R-6 differ in physical dimensions and lead spacing. The 15KP17CA-TP uses R-6 packaging, requiring PCB layout verification to confirm pad spacing compatibility before substitution.

Q: Why do the substitute parts have higher power ratings?

A: The 5KP17CA-B, 15KP17CA-TP, and 15KPA17CAE3/TR13 represent newer product generations with improved thermal management and semiconductor design. Higher power ratings (5kW and 15kW) reflect enhanced capability while maintaining the same voltage protection characteristics.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All three substitute parts carry ROHS3 compliance certification, matching the original 3KP17C-B. The 15KPA17CAE3/TR13 additionally carries REACH compliance status.

Q: Which substitute should I select for new designs?

A: Selection depends on application requirements. For equivalent performance in the same package, use 5KP17CA-B. For maximum transient suppression in P600 package, use 15KPA17CAE3/TR13. For R-6 package applications, use 15KP17CA-TP. All three are active products with confirmed long-term availability.

Q: Is the current rating difference between substitutes significant?

A: Current ratings (184.8A for 5KP17CA-B, 515.4A for 15KPA17CAE3/TR13) indicate peak pulse handling capability. Higher current ratings provide greater margin for transient suppression but do not affect voltage protection characteristics. Selection should align with circuit peak current requirements.

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