5KP8.5CA-B Equivalent & Substitute Parts

Part Overview

The 5KP8.5CA-B is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This through-hole component operates with an 8.5V reverse standoff voltage and provides 5000W peak pulse power dissipation. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across the specified parameter range.

Substiute Parts

5KP8.5CA-B

Littelfuse Inc.In Stock: 8405KP8.5CA-B Datasheet

Current PartRFQ

5KP8.5CA

Diotec SemiconductorIn Stock: 42515KP8.5CA Datasheet

MFR RecommendedRFQ

SA8.5CA

Taiwan Semiconductor CorporationIn Stock: 16110SA8.5CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 5KP8.5CA-B are qualified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 8.5V
• Voltage - Clamping (Max) @ Ipp: 14.4V
• Voltage - Breakdown (Min): 9.44V
• Bidirectional Channels: 1
• Type: Zener
• Mounting Type: Through Hole
• Package compatibility: P600 or equivalent axial through-hole package

Two substitute parts meet these criteria with allowable variations in peak pulse current and power dissipation capacity, provided the application does not exceed the substitute part's rated specifications.

Parameter Comparison

Engineering Selection Recommendations

5KP8.5CA (Diotec Semiconductor): This substitute maintains identical voltage specifications and package form factor (P600, Axial) with peak pulse current of 347A and 5000W power dissipation. Operating temperature range is -50 to 175°C, which covers the primary operating window of the original part. ROHS3 compliance is confirmed. This substitute is suitable for direct replacement in applications where the original 5KP8.5CA-B is specified and peak pulse current requirements do not exceed 347A.

SA8.5CA (Taiwan Semiconductor Corporation): This substitute maintains identical voltage specifications and operating temperature range (-55 to 175°C) with ROHS3 compliance. However, the package form factor differs (DO-204AC/DO-15 instead of P600) and peak pulse current is limited to 36A with 500W power dissipation. This substitute is applicable only in applications where peak pulse current does not exceed 36A and the DO-204AC package footprint is acceptable for the circuit board layout.

Frequently Asked Questions (FAQ)

Q: Can the 5KP8.5CA (Diotec) be used as a direct replacement for the 5KP8.5CA-B?

A: Yes, the 5KP8.5CA from Diotec Semiconductor qualifies as a direct substitute. Both parts share identical voltage ratings (8.5V standoff, 14.4V clamping), the same P600 axial package, and equivalent power dissipation (5000W). Peak pulse current differs slightly (347A vs. 354.2A), but this remains within acceptable tolerance for most general-purpose applications. Verify that your application does not require the full 354.2A peak pulse current specification.

Q: What are the limitations of the SA8.5CA substitute?

A: The SA8.5CA maintains voltage compatibility but operates at significantly reduced power levels (500W vs. 5000W) and peak pulse current (36A vs. 354.2A). Additionally, the package form factor is DO-204AC (DO-15) rather than P600, requiring circuit board layout modification. Use this substitute only in low-current transient suppression applications where peak pulse current does not exceed 36A.

Q: Are all three parts ROHS3 compliant?

A: Yes, all three parts—5KP8.5CA-B (Littelfuse), 5KP8.5CA (Diotec), and SA8.5CA (Taiwan Semiconductor)—are ROHS3 compliant and suitable for applications requiring environmental compliance certification.

Q: What is the temperature operating range difference between substitutes?

A: The 5KP8.5CA-B and SA8.5CA both operate from -55 to 175°C. The 5KP8.5CA (Diotec) operates from -50 to 175°C, a 5°C difference at the lower temperature limit. For applications requiring operation below -50°C, the Diotec substitute is not suitable.

Q: Can package differences affect circuit performance?

A: Package differences affect board layout and mechanical integration but do not alter electrical performance if voltage and current ratings are respected. The P600 package (5KP8.5CA-B and 5KP8.5CA) and DO-204AC package (SA8.5CA) are both axial through-hole designs. Verify that the substitute package footprint is compatible with your circuit board design before implementation.