Equivalent & Substitute Parts for 3KP9.0CA TVS Diode

Part Overview

The 3KP9.0CA is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 9V reverse standoff voltage, 15.4V maximum clamping voltage, and 3000W peak pulse power rating in a P600 axial through-hole package. The part is currently obsolete, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for circuit protection requirements.

Substiute Parts

3KP9.0CA

Littelfuse Inc.In Stock: 11703KP9.0CA Datasheet

Current PartRFQ

5KP9.0CA

LittelfuseIn Stock: 43645KP9.0CA Datasheet

DirectRFQ

1.5KE10CA

Taiwan Semiconductor CorporationIn Stock: 10761.5KE10CA Datasheet

MFR RecommendedRFQ

P6KE10CA

Fairchild SemiconductorIn Stock: 9077P6KE10CA Datasheet

MFR RecommendedRFQ

1N6144

Microchip TechnologyIn Stock: 11501N6144 Datasheet

MFR RecommendedRFQ

P6KE10CA

Fairchild SemiconductorIn Stock: 9077P6KE10CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3KP9.0CA are selected based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Voltage - Reverse Standoff (Typ): 9V ± tolerance
• Voltage - Breakdown (Min): 10V minimum
• Voltage - Clamping (Max) @ Ipp: 15.4V or lower
• Bidirectional operation (1 channel)
• Through-hole axial mounting
• Operating temperature range: -55°C to 175°C minimum

Secondary Considerations:

• Peak pulse power rating (3000W or higher preferred for direct replacement)
• Peak pulse current capability (194.8A or higher preferred)
• RoHS3 compliance for regulatory alignment

The substitute parts listed below meet the voltage and thermal specifications of the original component. Variations in package type (P600 vs. DO-201 vs. DO-15) and peak power ratings reflect available alternatives with equivalent electrical protection characteristics.

Parameter Comparison

Engineering Selection Recommendations

5KP9.0CA (Littelfuse) — Preferred Direct Replacement This part maintains identical voltage specifications (9V standoff, 15.4V clamping) and the same P600 axial package as the original 3KP9.0CA. The 5KP9.0CA is currently in active production status with higher peak pulse power (5000W vs. 3000W) and increased current capability (331.2A vs. 194.8A), providing enhanced protection margin. ROHS3 compliance is maintained. This is the optimal choice for direct PCB substitution without layout modifications.

1.5KE10CA (Taiwan Semiconductor Corporation) — Voltage-Compatible Alternative This part operates within acceptable voltage parameters (8.55V standoff, 14.5V clamping) and maintains the full operating temperature range. Active product status and ROHS3 compliance are confirmed. The DO-201 package differs from the original P600, requiring PCB footprint verification. Peak power rating (1500W) is lower than the original specification, suitable for applications with reduced transient energy requirements.

P6KE10CA (Fairchild Semiconductor) — Lower Power Alternative This part meets voltage specifications (8.5V standoff, 14.5V clamping) with active product status. The DO-15 package requires PCB footprint modification. Peak power rating (600W) is significantly reduced compared to the original 3000W specification, limiting application to circuits with lower transient energy levels. Use only when power requirements are confirmed compatible.

1N6144 (Microchip Technology) — Marginal Compatibility This part exhibits higher clamping voltage (16.9V vs. 15.4V) and lower peak current (88.8A vs. 194.8A) compared to the original specification. RoHS non-compliance presents regulatory concerns for new designs. The C axial package requires footprint verification. This option is suitable only for legacy system maintenance where regulatory compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can the 5KP9.0CA directly replace the 3KP9.0CA without PCB modifications? A: Yes. The 5KP9.0CA maintains identical voltage ratings and the same P600 axial through-hole package, enabling direct PCB substitution. The increased power rating (5000W vs. 3000W) provides additional protection margin without circuit impact.

Q: What is the primary difference between the 3KP9.0CA and 5KP9.0CA? A: Both parts share identical voltage specifications (9V standoff, 15.4V clamping). The 5KP9.0CA provides higher peak pulse power (5000W vs. 3000W) and peak current (331.2A vs. 194.8A), representing an enhanced version of the same electrical protection function.

Q: Why do substitute parts have different package types? A: The 1.5KE10CA uses DO-201 packaging, and the P6KE10CA uses DO-15 packaging, reflecting different manufacturer design standards. These packages are physically distinct from the original P600 package and require PCB footprint modifications for installation.

Q: Are all substitute parts RoHS3 compliant? A: The 5KP9.0CA, 1.5KE10CA, and P6KE10CA are ROHS3 compliant. The 1N6144 is RoHS non-compliant and should not be used in applications requiring regulatory compliance.

Q: What is the operating temperature range for these TVS diodes? A: All substitute parts operate within -55°C to 175°C (junction temperature), matching or exceeding the original 3KP9.0CA specification. The P6KE10CA has a minimum operating temperature of -50°C, which is acceptable for most applications.

Q: Can the 1.5KE10CA or P6KE10CA be used as direct replacements? A: These parts are voltage-compatible but require PCB footprint modifications due to different package types. The 1.5KE10CA and P6KE10CA are suitable for redesigned circuits where package changes are accommodated. Peak power ratings should be verified against application transient energy requirements.

Q: What does "peak pulse power" mean in TVS diode specifications? A: Peak pulse power (measured in watts) indicates the maximum energy the TVS diode can dissipate during a transient overvoltage event. Higher ratings provide greater protection margin for high-energy transients. The original 3KP9.0CA is rated for 3000W; lower-rated alternatives may not provide equivalent protection in high-energy applications.

Q: Is the 1N6144 suitable for new product designs? A: The 1N6144 is not recommended for new designs due to RoHS non-compliance. It is suitable only for legacy system maintenance where regulatory compliance is not required. For new designs, select from the ROHS3-compliant alternatives.