3KP28C-B Equivalent & Substitute Parts

Part Overview

The 3KP28C-B is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 28V reverse standoff voltage with a 47.67V maximum clamping voltage and 66.1A peak pulse current capability in a through-hole P600 axial package. The product is currently obsolete, making identification of suitable equivalent and substitute parts essential for ongoing system maintenance, repairs, and redesigns where this component is specified.

Substiute Parts

3KP28C-B

Littelfuse Inc.In Stock: 10913KP28C-B Datasheet

Current PartRFQ

5KP28CA-B

Littelfuse Inc.In Stock: 10765KP28CA-B Datasheet

DirectRFQ

15KP28CA-TP

Micro Commercial CoIn Stock: 109215KP28CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3KP28C-B is determined by the following critical parameters that must remain consistent across equivalent parts:

• Voltage - Reverse Standoff (Typ): 28V — all substitutes must maintain this standoff voltage to ensure proper circuit protection thresholds
• Bidirectional Channels: 1 — single-channel configuration required
• Mounting Type: Through Hole — mechanical compatibility with existing PCB layouts
• Package / Case: P600 or R-6 Axial — physical form factor compatibility
• Operating Temperature Range: -55°C ~ 175°C (TJ) — thermal operating envelope
• Type: Zener — diode technology classification
• RoHS Status: ROHS3 Compliant — regulatory compliance requirement

Voltage - Clamping (Max) @ Ipp, Current - Peak Pulse, and Power - Peak Pulse may vary within acceptable ranges for the application, as these parameters define the protection capability level rather than the fundamental circuit compatibility.

Parameter Comparison

Engineering Selection Recommendations

5KP28CA-B (Littelfuse Inc.) — This substitute maintains identical standoff voltage, breakdown voltage characteristics, and thermal operating range as the 3KP28C-B. The component is in active production status, ensuring long-term availability. It provides enhanced peak pulse current (112.3A versus 66.1A) and power dissipation (5kW versus 3kW), offering improved protection margins. The P600 axial package provides direct mechanical compatibility with existing through-hole PCB layouts. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) align with the original specification.

15KP28CA-TP (Micro Commercial Co) — This substitute maintains the same 28V standoff voltage and thermal operating range. It offers the highest power dissipation capability (15kW) among available substitutes, providing maximum protection headroom. The R-6 axial package is mechanically compatible with through-hole mounting, though physical dimensions may differ slightly from the P600 package. The component is in active production with ROHS3 compliance and REACH unaffected status. Selection of this part is appropriate where maximum transient energy absorption is required or where PCB layout permits the R-6 package form factor.

Frequently Asked Questions (FAQ)

Q: Can the 5KP28CA-B directly replace the 3KP28C-B in existing designs?

A: Yes. Both components share the same 28V reverse standoff voltage, identical operating temperature range (-55°C ~ 175°C), and P600 axial through-hole package. The 5KP28CA-B provides higher peak pulse current and power dissipation, making it functionally compatible and offering improved protection capability.

Q: What is the difference between the P600 and R-6 packages?

A: Both are axial through-hole packages for TVS diodes. The P600 package is the original form factor for the 3KP28C-B. The R-6 package used by the 15KP28CA-TP is also an axial configuration but may have different physical dimensions. Verify PCB layout compatibility before selecting the 15KP28CA-TP as a substitute.

Q: Why do the substitute parts have different peak pulse current and power ratings?

A: The 5KP28CA-B and 15KP28CA-TP are designed for higher energy transient suppression applications. While they maintain the same 28V standoff voltage and clamping characteristics, they provide enhanced current handling and power dissipation. These differences do not affect circuit compatibility; they represent improved protection margins.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. Both the 5KP28CA-B and 15KP28CA-TP are ROHS3 compliant, matching the regulatory status of the original 3KP28C-B component.

Q: Which substitute should I select for a new design?

A: The 5KP28CA-B is recommended for direct replacement applications due to identical package compatibility and active production status from the original manufacturer. The 15KP28CA-TP is suitable where maximum transient energy absorption is required and R-6 package dimensions are acceptable for the PCB layout.