LC26 Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The LC26 is an active Microchip Technology transient voltage suppressor (TVS) diode designed for general-purpose overvoltage protection applications. This unidirectional zener-type device operates through a DO-13 (DO-202AA) through-hole package and provides 26V reverse standoff voltage with 46.6V maximum clamping voltage at peak pulse current.

The LC26 is classified as an active product with current inventory availability. Substitute parts are identified based on equivalent electrical performance within the transient voltage suppression category, allowing for component interchangeability in circuit designs where voltage regulation and surge protection requirements align with the specified parameters.

Substiute Parts

LC26

Microchip TechnologyIn Stock: 692LC26 Datasheet

Current PartRFQ

LCE28A

Littelfuse Inc.In Stock: 2122LCE28A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LC26 is determined by electrical equivalence within the transient voltage suppression category. The primary substitution criteria are:

Voltage Parameters: The reverse standoff voltage, breakdown voltage minimum, and clamping voltage maximum must remain within acceptable tolerance ranges for the protected circuit. The LC26 operates at 26V standoff with 46.6V maximum clamp voltage.

Current Handling: Peak pulse current rating (10/1000µs pulse) must equal or exceed the application requirement. The LC26 is rated for 32A peak pulse current.

Power Dissipation: Peak pulse power rating must support the transient energy absorption requirement. The LC26 is rated for 1500W peak pulse power.

Package Compatibility: Through-hole mounting packages (DO-13, DO-201, DO-27) are mechanically and electrically interchangeable in PCB designs utilizing axial lead component footprints.

Temperature Range: Operating temperature range must encompass the application environment. The LC26 operates from -65°C to 175°C junction temperature.

The LCE28A from Littelfuse Inc. qualifies as a substitute based on comparable voltage regulation characteristics, equivalent peak pulse current and power ratings, and compatible through-hole package options.

Parameter Comparison

Engineering Selection Recommendations

LC26 Selection: The LC26 remains the primary component choice for applications requiring Microchip Technology sourcing, RoHS non-compliant specifications, or DO-13 package constraints. The device is active and maintains current inventory status.

LCE28A Selection: The LCE28A from Littelfuse Inc. is selected as a substitute when ROHS3 compliance is required, when DO-201 or DO-27 axial package formats are preferred for PCB layout, or when higher peak pulse current capacity (33A versus 32A) provides design margin. The LCE28A operates within a reduced lower temperature bound (-55°C versus -65°C), which is acceptable for most industrial and commercial applications.

Both devices share equivalent peak pulse power ratings (1500W), unidirectional zener topology, and general-purpose application classification. The voltage parameters differ by approximately 2V in standoff and breakdown specifications, which is within typical tolerance ranges for transient suppression circuits.

Frequently Asked Questions (FAQ)

Q: Can the LCE28A directly replace the LC26 in an existing circuit?

A: The LCE28A is electrically equivalent for transient voltage suppression applications. The 2V difference in reverse standoff voltage (28V versus 26V) and clamping voltage (45.5V versus 46.6V) falls within acceptable substitution tolerance for general-purpose protection circuits. Physical package differences (DO-201 versus DO-13) require PCB footprint compatibility verification.

Q: What is the significance of the voltage parameter differences between LC26 and LCE28A?

A: The LC26 operates at 26V reverse standoff with 46.6V maximum clamp voltage. The LCE28A operates at 28V reverse standoff with 45.5V maximum clamp voltage. These differences represent approximately 7.7% and 2.4% variations respectively. For circuits protecting 24V or 28V nominal supplies, the respective device should be selected to ensure proper standoff voltage margin.

Q: Are the through-hole packages (DO-13 and DO-201) mechanically interchangeable?

A: DO-13 (DO-202AA) and DO-201 packages are both axial through-hole formats with compatible lead spacing for standard 0.3-inch PCB hole patterns. Physical package dimensions differ slightly; PCB footprint design must accommodate the specific package geometry selected.

Q: What is the impact of the operating temperature range difference?

A: The LC26 operates from -65°C to 175°C junction temperature, while the LCE28A operates from -55°C to 175°C. The LCE28A has a 10°C higher minimum operating temperature. For applications requiring operation below -55°C, the LC26 is required. For standard industrial and commercial temperature ranges, both devices are equivalent.

Q: Does RoHS compliance affect substitution decisions?

A: The LC26 is RoHS non-compliant, while the LCE28A is ROHS3 compliant. Applications subject to RoHS regulatory requirements must use the LCE28A. Applications without RoHS constraints may use either device based on electrical and package requirements.

Q: How do the peak pulse current ratings compare?

A: The LC26 is rated for 32A peak pulse current (10/1000µs), while the LCE28A is rated for 33A. The 1A difference (3.1% higher capacity in LCE28A) provides additional design margin for transient current absorption without affecting substitution compatibility.