3KP9.0A-B Equivalent & Substitute Parts

Part Overview

The 3KP9.0A-B is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This component features a 9V reverse standoff voltage, 15.4V maximum clamping voltage, and 3000W peak pulse power rating in a through-hole P600 axial package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement.

Substiute Parts

3KP9.0A-B

Littelfuse Inc.In Stock: 9653KP9.0A-B Datasheet

Current PartRFQ

5KP9.0A-B

Littelfuse Inc.In Stock: 12025KP9.0A-B Datasheet

DirectRFQ

1.5KE10A

Taiwan Semiconductor CorporationIn Stock: 43181.5KE10A Datasheet

MFR RecommendedRFQ

P6KE10A

Fairchild SemiconductorIn Stock: 5025P6KE10A Datasheet

MFR RecommendedRFQ

3KP9.0A-TP

Micro Commercial CoIn Stock: 9553KP9.0A-TP Datasheet

DirectRFQ

5KP9.0A-TP

Micro Commercial CoIn Stock: 63685KP9.0A-TP Datasheet

MFR RecommendedRFQ

P6KE10A

Fairchild SemiconductorIn Stock: 5025P6KE10A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP9.0A-B is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - Reverse Standoff: 9V (±tolerance)
• Voltage - Clamping (Max) @ Ipp: 15.4V (±tolerance)
• Current - Peak Pulse (10/1000µs): minimum 194.8A
• Power - Peak Pulse: minimum 3000W
• Type: Zener, Unidirectional
• Mounting Type: Through Hole
• Operating Temperature Range: -55°C to 175°C minimum

Secondary Compatibility Factors:

• Package compatibility (P600 axial preferred; alternative axial packages acceptable with mechanical verification)
• RoHS3 compliance
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories: direct electrical equivalents with identical or superior electrical specifications, and functional alternatives with comparable voltage and power ratings that meet application requirements.

Parameter Comparison

Engineering Selection Recommendations

Tier 1 - Direct Electrical Equivalents (Preferred):

5KP9.0A-B and 3KP9.0A-TP are the primary substitutes for the 3KP9.0A-B. Both maintain identical voltage specifications (9V reverse standoff, 15.4V clamping) and equal or superior current/power ratings. The 5KP9.0A-B offers enhanced power dissipation (5000W vs. 3000W) while maintaining the same package footprint (P600 axial). The 3KP9.0A-TP provides identical electrical performance with an alternative R-6 axial package. Both are active products with ROHS3 compliance and MSL 1 rating, ensuring long-term availability and environmental compliance.

Tier 2 - Enhanced Power Rating Alternative:

5KP9.0A-TP combines the voltage specifications of the original part with 5000W peak pulse power in an R-6 axial package. This option provides superior transient protection capability while maintaining active product status and ROHS3 compliance.

Tier 3 - Functional Alternatives (Lower Power Applications):

1.5KE10A and P6KE10A are functional alternatives for applications where the full 3000W power rating is not required. The 1.5KE10A maintains the 9V nominal voltage class with 1500W power rating in a DO-201 package. The P6KE10A operates at 8.5V nominal with 600W power rating in a DO-15 package. These options are suitable only for reduced transient energy applications and require circuit-level verification of adequacy.

Compliance Considerations:

All Tier 1 and Tier 2 substitutes maintain ROHS3 compliance and MSL 1 rating, ensuring compatibility with modern manufacturing and storage requirements. The 1.5KE10A and P6KE10A are active products with ROHS3 compliance; however, the P6KE10A does not specify MSL rating.

Frequently Asked Questions (FAQ)

Q: Can the 5KP9.0A-B directly replace the 3KP9.0A-B?

A: Yes. The 5KP9.0A-B is a direct electrical equivalent with identical voltage specifications (9V reverse standoff, 15.4V clamping) and superior power rating (5000W vs. 3000W). Both use the P600 axial package. The higher power rating provides enhanced transient suppression capability without compromising circuit compatibility.

Q: What is the difference between the 3KP9.0A-TP and 5KP9.0A-TP?

A: Both parts maintain identical voltage specifications and use the R-6 axial package. The primary difference is power rating: 3KP9.0A-TP is rated at 3000W, while 5KP9.0A-TP is rated at 5000W. The 5KP9.0A-TP provides superior transient energy absorption capability.

Q: Are package changes acceptable when substituting?

A: Package changes from P600 to R-6 axial are acceptable from an electrical standpoint, as both are through-hole axial configurations. However, mechanical verification is required to confirm PCB layout compatibility, lead spacing, and mounting clearances. DO-201 and DO-15 packages represent larger dimensional changes and require full mechanical and thermal analysis.

Q: Why are 1.5KE10A and P6KE10A listed as alternatives?

A: These parts are functional alternatives for applications where transient energy levels are lower than the original 3000W specification. The 1.5KE10A maintains the 9V voltage class with reduced power rating (1500W). The P6KE10A operates at 8.5V nominal with 600W power rating. Both are active products but require circuit-level verification that the reduced power rating is adequate for the application.

Q: What is the significance of the "Obsolete" status for the 3KP9.0A-B?

A: Obsolete status indicates the part is no longer manufactured by Littelfuse Inc. and future availability cannot be guaranteed. Substitution with an active product (5KP9.0A-B, 3KP9.0A-TP, or 5KP9.0A-TP) ensures long-term supply chain continuity and access to technical support.

Q: Are all substitute parts ROHS3 compliant?

A: All Tier 1 and Tier 2 substitutes (5KP9.0A-B, 3KP9.0A-TP, 5KP9.0A-TP) explicitly specify ROHS3 compliance. The 1.5KE10A also specifies ROHS3 compliance. The P6KE10A does not specify RoHS status in the provided data and requires verification before use in RoHS-restricted applications.

Q: What is MSL 1 (Unlimited) and why does it matter?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture-controlled storage or handling. All Tier 1 and Tier 2 substitutes maintain MSL 1 rating, ensuring compatibility with standard warehouse and manufacturing environments without additional moisture management procedures.