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

Part Overview

The 3KP9.0CA-B is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient protection applications. This part operates with a 9V reverse standoff voltage and provides 15.4V maximum clamping voltage at peak pulse current. The 3KP9.0CA-B is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

3KP9.0CA-B

Littelfuse Inc.In Stock: 7933KP9.0CA-B Datasheet

Current PartRFQ

5KP9.0CA-B

Littelfuse Inc.In Stock: 8585KP9.0CA-B Datasheet

DirectRFQ

1.5KE10CA

Taiwan Semiconductor CorporationIn Stock: 10761.5KE10CA Datasheet

MFR RecommendedRFQ

P6KE10CA

Fairchild SemiconductorIn Stock: 9077P6KE10CA Datasheet

MFR RecommendedRFQ

3KP9.0CA-TP

Micro Commercial CoIn Stock: 10163KP9.0CA-TP Datasheet

DirectRFQ

1N6144

Microchip TechnologyIn Stock: 11501N6144 Datasheet

MFR RecommendedRFQ

P6KE10CA

Fairchild SemiconductorIn Stock: 9077P6KE10CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP9.0CA-B is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): 9V nominal
• Voltage - Clamping (Max) @ Ipp: 15.4V maximum
• Current - Peak Pulse (10/1000µs): 194.8A minimum
• Power - Peak Pulse: 3000W (3kW) minimum
• Bidirectional operation: 1 channel
• Mounting Type: Through Hole
• Operating Temperature: -55°C ~ 175°C

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical performance and package compatibility within the same series or equivalent mechanical footprint.

Functional Alternatives provide equivalent voltage protection and current handling but may differ in package type, peak pulse power rating, or manufacturer, requiring mechanical or layout verification.

Parameter Comparison

Engineering Selection Recommendations

5KP9.0CA-B is the primary direct equivalent. This Littelfuse Inc. part maintains identical voltage specifications (9V standoff, 15.4V clamping) and identical package (P600, Axial). The 5KP9.0CA-B offers higher peak pulse current (331.2A vs. 194.8A) and greater peak pulse power (5000W vs. 3000W), providing enhanced transient protection margin. Product status is Active, ensuring long-term availability and ROHS3 compliance.

3KP9.0CA-TP is a direct electrical equivalent from Micro Commercial Co, maintaining identical voltage and current specifications (194.8A peak pulse, 3000W power). The package differs (R-6 vs. P600), requiring mechanical verification for PCB layout compatibility. Product status is Active.

1.5KE10CA from Taiwan Semiconductor Corporation provides functional protection with slightly lower voltage specifications (8.55V standoff, 14.5V clamping) and reduced peak pulse current (108A). This part is suitable for applications with lower transient energy requirements. Product status is Active with ROHS3 compliance.

1N6144 from Microchip Technology offers functional protection with higher clamping voltage (16.9V) and lower peak pulse current (88.8A). This part is RoHS non-compliant, limiting use in regulated environments. Product status is Active.

P6KE10CA from Fairchild Semiconductor provides the lowest peak pulse current (43A) and power rating (600W), suitable only for low-energy transient applications. Package differs (DO-15 vs. P600). Product status is Active.

Frequently Asked Questions (FAQ)

Q: Can 5KP9.0CA-B directly replace 3KP9.0CA-B without circuit modification?

A: Yes. The 5KP9.0CA-B maintains identical voltage specifications and package type (P600, Axial). The higher peak pulse current and power rating provide additional protection margin without requiring circuit changes.

Q: What is the primary difference between 3KP9.0CA-B and 3KP9.0CA-TP?

A: Both parts have identical electrical specifications (9V standoff, 15.4V clamping, 194.8A peak pulse). The difference is the package type: 3KP9.0CA-B uses P600 package while 3KP9.0CA-TP uses R-6 package. PCB footprint compatibility must be verified before substitution.

Q: Why is 1.5KE10CA listed as a substitute if it has lower current rating?

A: The 1.5KE10CA provides equivalent voltage protection (8.55V standoff, 14.5V clamping) for applications where peak pulse current requirements are lower than 194.8A. It is suitable for lower-energy transient environments but not for applications requiring the full 194.8A protection capability.

Q: Is 1N6144 suitable for new designs?

A: The 1N6144 is RoHS non-compliant, making it unsuitable for applications subject to RoHS regulations. For new designs, select from ROHS3-compliant alternatives such as 5KP9.0CA-B or 1.5KE10CA.

Q: What package considerations apply when selecting P6KE10CA?

A: The P6KE10CA uses DO-15 (DO-204AC) package instead of P600. This requires PCB layout verification. Additionally, the 43A peak pulse current is significantly lower than the 194.8A specification of the main part, limiting its use to low-energy transient applications only.

Q: Which substitute offers the best long-term availability?

A: The 5KP9.0CA-B from Littelfuse Inc. has Active product status, ROHS3 compliance, and identical electrical and mechanical specifications, making it the optimal choice for long-term design support and procurement.