LCE28 Equivalent & Substitute Parts

Part Overview

The LCE28 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. Rated at 28V reverse standoff voltage with a 47.78V maximum clamping voltage and 33A peak pulse current capability, the LCE28 operates across the temperature range of -55°C to 175°C in a through-hole DO-201 package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

LCE28

Littelfuse Inc.In Stock: 936LCE28 Datasheet

Current PartRFQ

LCE28A

Littelfuse Inc.In Stock: 2122LCE28A Datasheet

DirectRFQ

3KP28A-TP

Micro Commercial CoIn Stock: 19123KP28A-TP Datasheet

MFR RecommendedRFQ

5KP28E3/TR13

Microchip TechnologyIn Stock: 8675KP28E3/TR13 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LCE28 is determined by the following critical parameters: 28V reverse standoff voltage, through-hole axial mounting, operating temperature range of -55°C to 175°C, and ROHS3 compliance. Substitute parts must maintain the same voltage class and thermal operating range to ensure functional equivalence in general-purpose overvoltage protection circuits.

The substitute parts identified are grouped by their adherence to these core electrical and mechanical specifications:

• LCE28A: Direct Littelfuse equivalent with identical standoff voltage, same package type, and active product status
• 3KP28A-TP: Micro Commercial Co alternative with matching 28V standoff voltage and through-hole axial configuration
• 5KP28E3/TR13: Microchip Technology alternative with matching 28V standoff voltage and through-hole axial configuration

All substitutes maintain the 28V reverse standoff voltage, -55°C to 175°C operating temperature range, through-hole mounting, and ROHS3 compliance required for functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

LCE28A is the primary substitute for the obsolete LCE28. Both parts are manufactured by Littelfuse Inc., share identical electrical specifications for standoff voltage and peak pulse current, and maintain the same operating temperature range and package configuration. LCE28A holds active product status with higher inventory availability, ensuring long-term procurement viability.

3KP28A-TP (Micro Commercial Co) and 5KP28E3/TR13 (Microchip Technology) are alternative substitutes that maintain the 28V standoff voltage and through-hole axial mounting required for circuit compatibility. Both alternatives are active products with ROHS3 compliance. The 3KP28A-TP offers comparable power dissipation to the LCE28, while the 5KP28E3/TR13 provides enhanced power handling (5000W) and peak pulse current (100A) for applications requiring higher transient energy absorption.

All substitute parts meet the compliance requirements (ROHS3, MSL 1) and thermal operating range (-55°C to 175°C) of the original LCE28.

Frequently Asked Questions (FAQ)

Q: Can LCE28A be used as a direct replacement for LCE28? A: Yes. LCE28A is manufactured by the same supplier (Littelfuse Inc.) and maintains identical reverse standoff voltage (28V), peak pulse current (33A), power dissipation (1500W), operating temperature range (-55°C to 175°C), and through-hole axial package configuration. LCE28A is the recommended substitute due to its active product status.

Q: What is the difference between the clamping voltages of LCE28 (47.78V) and its substitutes? A: The clamping voltage represents the maximum voltage across the TVS diode during transient suppression at peak pulse current. LCE28 clamps at 47.78V, while LCE28A clamps at 45.5V, 3KP28A-TP at 45.4V, and 5KP28E3/TR13 at 50V. All values remain within acceptable ranges for 28V standoff voltage applications. Circuit design should account for the specific clamping voltage of the selected substitute.

Q: Are the package types interchangeable between LCE28, 3KP28A-TP, and 5KP28E3/TR13? A: All three parts are through-hole axial packages suitable for PCB mounting. LCE28 and LCE28A use DO-201AA/DO-27 packages, 3KP28A-TP uses R-6 package, and 5KP28E3/TR13 uses P600 package. Physical dimensions differ between package types; verify PCB footprint compatibility before substitution.

Q: Which substitute offers the highest transient energy protection? A: The 5KP28E3/TR13 provides the highest power dissipation (5000W) and peak pulse current (100A), making it suitable for applications requiring enhanced transient suppression capability. LCE28A and 3KP28A-TP are appropriate for applications matching the original LCE28 specifications (1500W, 33A).

Q: Do all substitutes meet RoHS and environmental compliance requirements? A: Yes. All substitute parts (LCE28A, 3KP28A-TP, 5KP28E3/TR13) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the original LCE28.