Equivalent & Substitute Parts for 3KP36 Transient Voltage Suppressor

Part Overview

The 3KP36 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose voltage protection applications. This component features a 36V reverse standoff voltage with a 61.01V maximum clamping voltage and 51.6A peak pulse current capability in a through-hole P600 axial package. The 3KP36 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute components must maintain electrical compatibility across voltage ratings, current handling, and thermal specifications while meeting modern compliance standards.

Substiute Parts

3KP36

Littelfuse Inc.In Stock: 10793KP36 Datasheet

Current PartRFQ

5KP36A

Diotec SemiconductorIn Stock: 41685KP36A Datasheet

DirectRFQ

5KP36A-TP

Micro Commercial CoIn Stock: 26415KP36A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3KP36 is determined by the following critical parameters:

• Voltage - Reverse Standoff: Must be 36V (±tolerance as per manufacturer specifications)
• Voltage - Clamping (Max) @ Ipp: Must not exceed 61.01V to ensure circuit protection integrity
• Current - Peak Pulse (10/1000µs): Must be ≥51.6A to handle transient events
• Power - Peak Pulse: Must be ≥3000W to dissipate energy without thermal failure
• Operating Temperature Range: Must encompass -55°C to 175°C or be compatible with application requirements
• Package / Case: Must be P600 or R-6 axial through-hole configuration
• Type: Must be Zener unidirectional TVS diode
• Unidirectional Channels: Must be 1 channel
• RoHS Compliance: Must meet ROHS3 standards

The identified substitute parts (5KP36A and 5KP36A-TP) meet these criteria with enhanced performance characteristics, particularly in peak pulse current and power dissipation ratings.

Parameter Comparison

Engineering Selection Recommendations

Both 5KP36A and 5KP36A-TP are qualified substitutes for the obsolete 3KP36. Selection between these alternatives should be based on the following factors:

5KP36A (Diotec Semiconductor): This part offers superior performance with 86A peak pulse current and 5000W power dissipation, exceeding the original 3KP36 specifications. The lower clamping voltage (58.1V vs. 61.01V) provides enhanced circuit protection. This part is supplied in Tape & Reel packaging and maintains ROHS3 compliance. The operating temperature range is -50 to 175°C, which covers most industrial applications, though the lower minimum temperature (-50°C vs. -55°C) may be a consideration for extreme cold environments.

5KP36A-TP (Micro Commercial Co): This variant matches the original 3KP36 operating temperature range (-55 to 175°C) and provides 5000W power dissipation. It is supplied in Cut Tape packaging and is ROHS3 compliant with REACH Unaffected status. The R-6 package is mechanically compatible with through-hole PCB layouts, though physical dimensions may differ slightly from the P600 package.

Both substitutes are active products with established supply chains and modern compliance certifications, making them suitable for production environments where the 3KP36 is no longer available.

Frequently Asked Questions (FAQ)

Q: Can the 5KP36A and 5KP36A-TP be used interchangeably with the 3KP36?

A: Both parts are electrically compatible substitutes for the 3KP36 within the specified application parameters. The primary difference is packaging: 5KP36A uses P600 axial configuration, while 5KP36A-TP uses R-6 axial configuration. Both are through-hole mounted and functionally equivalent for general-purpose TVS applications.

Q: What is the significance of the lower clamping voltage in the substitute parts?

A: The 5KP36A and 5KP36A-TP both feature a maximum clamping voltage of 58.1V compared to the 3KP36's 61.01V. This lower clamping voltage provides superior transient suppression, limiting voltage spikes to a lower level and offering better circuit protection. This is an improvement over the original specification.

Q: Are there temperature range considerations when substituting?

A: The 5KP36A operates from -50 to 175°C, while the 3KP36 and 5KP36A-TP both operate from -55 to 175°C. For applications requiring operation below -50°C, the 5KP36A-TP is the preferred choice to maintain full temperature range compatibility.

Q: How do the peak pulse current ratings affect substitution?

A: The 5KP36A provides 86A peak pulse current compared to the 3KP36's 51.6A. This higher current rating ensures the substitute can handle transient events with greater margin. The 5KP36A-TP does not specify peak pulse current in the provided data but maintains the same 5000W power dissipation rating, ensuring adequate energy handling capability.

Q: What packaging considerations apply to these substitutes?

A: The 3KP36 uses P600 axial packaging, the 5KP36A uses P600 axial packaging, and the 5KP36A-TP uses R-6 axial packaging. All three are through-hole mounted components. PCB layout compatibility should be verified, as the R-6 package may have different lead spacing or physical dimensions compared to P600.

Q: Are all substitute parts RoHS compliant?

A: Yes, both 5KP36A and 5KP36A-TP are ROHS3 compliant, matching the compliance status of the original 3KP36. This ensures compatibility with modern manufacturing and environmental regulations.