5KP9.0 Equivalent & Substitute Parts

Part Overview

The 5KP9.0 is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection applications. This unidirectional zener diode operates with a 9V reverse standoff voltage and provides 5000W peak pulse power dissipation in a through-hole P600 axial package. The 5KP9.0 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across voltage ratings, clamping characteristics, and thermal operating ranges while accommodating available packaging options.

Substiute Parts

5KP9.0

Littelfuse Inc.In Stock: 9255KP9.0 Datasheet

Current PartRFQ

5KP9.0A

LittelfuseIn Stock: 33145KP9.0A Datasheet

DirectRFQ

SA9.0A

Taiwan Semiconductor CorporationIn Stock: 300450SA9.0A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5KP9.0 are selected based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 9V (exact match required)
• Voltage - Breakdown (Min): 9.5V or higher
• Voltage - Clamping (Max) @ Ipp: 15.4V to 16.17V range
• Power - Peak Pulse: 500W minimum (5000W preferred for direct replacement)
• Operating Temperature: -55°C ~ 175°C (TJ)
• Mounting Type: Through Hole
• Type: Unidirectional Zener Diode
• RoHS Compliance: ROHS3 Compliant

The 5KP9.0A represents a direct manufacturer upgrade within the same 5KP series, maintaining identical electrical specifications while offering active product status and improved availability. The SA9.0A, manufactured by Taiwan Semiconductor Corporation, provides electrical compatibility with the same voltage ratings and clamping characteristics but operates at reduced peak pulse power (500W versus 5000W) and uses an alternative DO-204AC package format.

Parameter Comparison

Engineering Selection Recommendations

The 5KP9.0A is the primary recommended substitute for the obsolete 5KP9.0. Both parts maintain identical electrical specifications, thermal operating ranges, and package formats. The 5KP9.0A is manufactured by Littelfuse and holds active product status with significantly higher inventory availability (3300 pcs versus 887 pcs), ensuring supply chain continuity for new designs and production runs.

The SA9.0A, manufactured by Taiwan Semiconductor Corporation, provides an alternative substitute when package flexibility is acceptable. This part maintains voltage compatibility and thermal specifications but operates at reduced peak pulse power (500W versus 5000W) and uses the DO-204AC package instead of P600. Selection of SA9.0A is appropriate only for applications where peak pulse power requirements do not exceed 500W and where package substitution does not create mechanical or thermal management constraints.

Both substitute parts carry ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), matching the environmental and regulatory requirements of the original 5KP9.0.

Frequently Asked Questions (FAQ)

Q: Can the 5KP9.0A be used as a direct replacement for the 5KP9.0?

A: Yes. The 5KP9.0A maintains identical electrical specifications, including 9V reverse standoff voltage, 15.4V maximum clamping voltage, 5000W peak pulse power, and -55°C to 175°C operating temperature range. Both parts use the P600 axial package format. The primary difference is product status: 5KP9.0A is active with higher inventory availability.

Q: What are the limitations of using SA9.0A as a substitute?

A: The SA9.0A maintains voltage compatibility (9V standoff, 15.4V clamping) and thermal specifications but operates at 500W peak pulse power compared to the 5000W rating of the 5KP9.0. Additionally, SA9.0A uses the DO-204AC (DO-15) package instead of P600, requiring PCB layout and mechanical accommodation changes. SA9.0A is suitable only for applications where peak pulse power does not exceed 500W.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 5KP9.0A and SA9.0A are both ROHS3 compliant, matching the environmental compliance of the original 5KP9.0.

Q: What is the difference in peak pulse current between the substitute parts?

A: The 5KP9.0A specifies 331.2A peak pulse current at 10/1000µs, while SA9.0A specifies 34A. This difference reflects the 10:1 power rating difference (5000W versus 500W). Selection depends on application transient current requirements.

Q: Can package format be changed from P600 to DO-204AC in existing designs?

A: Package substitution from P600 to DO-204AC requires PCB layout modification, including lead spacing and mounting hole adjustments. Thermal management characteristics may also differ. Package changes should be evaluated against mechanical and thermal design constraints before implementation.