Equivalent & Substitute Parts for 3KP9.0C-B

Part Overview

The 3KP9.0C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse, rated at 9V reverse standoff with a 16.17V maximum clamping voltage and 194.8A peak pulse current. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing circuit protection applications requiring general-purpose transient voltage suppression in through-hole P600 axial packages.

Key Parameters

Parameter	3KP9.0C-B
Manufacturer	Littelfuse
Series	3KP
Product Status	Obsolete
Type	Zener
Bidirectional Channels	1
Voltage - Reverse Standoff (Typ)	9V
Voltage - Breakdown (Min)	9.5V
Voltage - Clamping (Max) @ Ipp	16.17V
Current - Peak Pulse (10/1000µs)	194.8A
Power - Peak Pulse	3000W (3kW)
Operating Temperature	-55°C ~ 175°C (TJ)
Mounting Type	Through Hole
Package / Case	P600, Axial
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 3KP9.0C-B is determined by the following critical parameters:

Voltage Parameters: Reverse standoff voltage (9V nominal), breakdown voltage minimum (9.5V), and clamping voltage maximum (16.17V) define the protection threshold and response characteristics.

Current and Power Ratings: Peak pulse current (194.8A) and peak pulse power (3000W) establish the transient energy handling capability.

Package and Mounting: Through-hole axial configuration with P600 package footprint.

Environmental and Compliance: Operating temperature range (-55°C to 175°C), RoHS3 compliance, and MSL rating (1).

Substitute parts are grouped into two categories:

Category 1 - Direct Voltage Match (9V Standoff): Parts with 9V reverse standoff voltage and comparable clamping characteristics, including 5KP9.0CA-B, SA9.0CA, and SA8.5CA.

Category 2 - Voltage Proximity (8.5V to 9.4V Standoff): Parts with standoff voltages within the acceptable range for general-purpose transient suppression, including 1.5KE10CA, 1.5KE11CA, P4KE11CA, P4KE9.1CA, P6KE10CA, P6KE11CA, and SA8.0CA.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Package / Case	Product Status	RoHS Status
3KP9.0C-B	Littelfuse	9V	9.5V	16.17V	194.8A	3000W	P600, Axial	Obsolete	ROHS3 Compliant
5KP9.0CA-B	Littelfuse Inc.	9V	10V	15.4V	331.2A	5000W	P600, Axial	Active	ROHS3 Compliant
1.5KE10CA	Taiwan Semiconductor Corporation	8.55V	9.5V	14.5V	108A	1500W	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
1.5KE11CA	Taiwan Semiconductor Corporation	9.4V	10.5V	15.6V	100A	1500W	DO-201AA, DO-27, Axial	Active	ROHS3 Compliant
P4KE11CA	Taiwan Semiconductor Corporation	9.4V	10.5V	15.6V	27A	400W	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant
P4KE9.1CA	Taiwan Semiconductor Corporation	7.78V	8.65V	13.4V	31A	400W	DO-204AL, DO-41, Axial	Active	ROHS3 Compliant
P6KE10CA	Fairchild Semiconductor	8.5V	9.5V	14.5V	43A	600W	DO-204AC, DO-15, Axial	Active	Not specified
P6KE11CA	Taiwan Semiconductor Corporation	9.4V	10.5V	15.6V	38A	600W	DO-204AC, DO-15, Axial	Active	ROHS3 Compliant
SA8.0CA	Taiwan Semiconductor Corporation	8V	8.89V	13.6V	38A	500W	DO-204AC, DO-15, Axial	Active	ROHS3 Compliant
SA8.5CA	Taiwan Semiconductor Corporation	8.5V	9.44V	14.4V	36A	500W	DO-204AC, DO-15, Axial	Active	ROHS3 Compliant
SA9.0CA	Taiwan Semiconductor Corporation	9V	10V	15.4V	34A	500W	DO-204AC, DO-15, Axial	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - 5KP9.0CA-B: This Littelfuse part maintains identical reverse standoff voltage (9V) and operates in the same P600 axial package. It offers superior current handling (331.2A versus 194.8A) and power dissipation (5000W versus 3000W), providing enhanced protection margin. Product status is active with ROHS3 compliance.

Secondary Substitutes - SA Series (SA9.0CA, SA8.5CA, SA8.0CA): Taiwan Semiconductor Corporation SA series parts provide active product status and ROHS3 compliance. SA9.0CA matches the 9V standoff voltage with 15.4V clamping, though in a smaller DO-15 package. SA8.5CA and SA8.0CA offer voltage proximity with slightly lower standoff ratings but maintain adequate clamping characteristics for general-purpose applications.

Alternative Substitutes - P6KE Series (P6KE11CA, P6KE10CA): These parts provide 600W power rating in DO-15 packages with active status. P6KE11CA matches 9.4V standoff with 15.6V clamping. P6KE10CA operates at 8.5V standoff with 14.5V clamping.

Lower Power Alternatives - 1.5KE and P4KE Series: These parts are suitable only for applications where reduced current and power handling are acceptable. 1.5KE10CA and 1.5KE11CA provide 1500W rating in DO-201 packages. P4KE series parts provide 400W rating in DO-41 packages. All maintain active product status and ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can 5KP9.0CA-B directly replace 3KP9.0C-B?

A: Yes. Both parts share identical 9V reverse standoff voltage, comparable clamping voltage (15.4V versus 16.17V), and the same P600 axial through-hole package. The 5KP9.0CA-B provides higher current and power ratings, making it a direct upgrade.

Q: What is the difference between P600 and DO-15 packages?

A: P600 is a larger axial package rated for higher power dissipation (3000W for 3KP series). DO-15 (DO-204AC) is a smaller axial package with lower power ratings (500W for SA series). Physical dimensions and PCB footprints differ; mechanical compatibility must be verified.

Q: Can SA9.0CA replace 3KP9.0C-B in all applications?

A: SA9.0CA matches the 9V standoff voltage and provides 15.4V clamping, but operates in a DO-15 package with 500W power rating versus the original 3000W. Substitution is valid only if circuit board layout accommodates the smaller package and application transient energy does not exceed 500W.

Q: Why do some substitutes have different standoff voltages?

A: Standoff voltages between 8V and 9.4V are acceptable for general-purpose transient suppression when clamping voltages remain within acceptable limits. Parts like SA8.0CA (8V) and P4KE9.1CA (7.78V) provide functional equivalence for applications with slightly lower voltage thresholds.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitutes except P6KE10CA (Fairchild Semiconductor) explicitly state ROHS3 compliance. Verify compliance documentation for P6KE10CA before use in regulated applications.

Q: What is the impact of lower peak pulse current ratings?

A: Parts with lower peak pulse current (such as P4KE series at 27-31A or 1.5KE series at 100-108A) handle reduced transient energy. Substitution is valid only if circuit transient current does not exceed the substitute part's rating.

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