LC24 TVS Diode Equivalent & Substitute Parts

Part Overview

The LC24 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection applications. This through-hole component operates with a 24V reverse standoff voltage and provides 43V maximum clamping voltage at peak pulse current. The part is currently in active production status with 905 units available in bulk packaging.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges for this TVS diode category. The primary substitute identified is the LCE28A from Littelfuse Inc., which operates at a higher voltage rating but maintains compatible peak pulse power handling and through-hole mounting configuration.

Substiute Parts

LC24

Microchip TechnologyIn Stock: 943LC24 Datasheet

Current PartRFQ

LCE28A

Littelfuse Inc.In Stock: 2122LCE28A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for TVS diodes in this category is determined by the following criteria:

Mandatory Compatibility Parameters:

• Unidirectional channel configuration (1 channel required)
• Through-hole mounting type
• Peak pulse power rating of 1500W minimum
• Peak pulse current rating within ±10% of 35A
• Clamping voltage within acceptable system protection limits
• Operating temperature range covering -55°C minimum to 175°C maximum

Voltage Rating Consideration: The LCE28A operates at 28V reverse standoff voltage, which is 4V higher than the LC24. This represents a higher protection threshold and is acceptable for circuits designed to tolerate the LC24's 24V standoff specification, as the substitute provides equivalent or superior clamping performance at comparable peak pulse levels.

Packaging Compatibility: Both the LC24 (DO-13/DO-202AA) and LCE28A (DO-201AA/DO-27 Axial) are through-hole packages with compatible lead spacing for standard PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

LC24 Selection Criteria: The LC24 remains the primary choice for applications requiring a 24V reverse standoff voltage specification with bulk packaging availability. This part is suitable for general-purpose transient suppression in circuits where the exact 24V threshold is a design requirement. Current inventory of 905 units supports immediate procurement needs.

LCE28A Selection Criteria: The LCE28A is suitable as a substitute when circuit design permits operation at 28V reverse standoff voltage. The higher voltage rating provides additional margin in overvoltage protection scenarios. The LCE28A offers ROHS3 compliance, which may be required for applications subject to environmental or regulatory restrictions. Cut tape packaging provides flexibility for automated assembly processes. Higher inventory availability (2040 units) supports volume production requirements.

Compliance Considerations: The LC24 is RoHS non-compliant, while the LCE28A is ROHS3 compliant. Selection between these parts should account for end-product regulatory requirements. Both parts are REACH unaffected and classified under ECCN EAR99 for export purposes.

Temperature Range: The LC24 operates from -65°C to 175°C, providing a 10°C lower minimum operating temperature than the LCE28A (-55°C to 175°C). Applications requiring operation below -55°C must use the LC24.

Frequently Asked Questions (FAQ)

Q: Can the LCE28A directly replace the LC24 in existing PCB designs?

A: Physical replacement is possible due to compatible through-hole mounting. However, the 28V reverse standoff voltage of the LCE28A is 4V higher than the LC24's 24V rating. Circuit designs must tolerate this higher protection threshold. Verify that the protected circuit can operate safely with the LCE28A's 45.5V maximum clamping voltage versus the LC24's 43V specification.

Q: What is the difference between DO-13 and DO-201 packages?

A: Both are through-hole axial packages used for TVS diodes. The DO-13 (DO-202AA) and DO-201 (DO-27) packages have different physical dimensions and lead spacing. PCB layout compatibility must be confirmed before substitution. Consult package datasheets for exact pin-to-pin measurements.

Q: Are there differences in peak pulse current handling between these parts?

A: The LC24 handles 35A peak pulse current while the LCE28A handles 33A. This 2A difference (approximately 6% lower on the substitute) falls within acceptable tolerance for most general-purpose applications. Applications with marginal current headroom should retain the LC24.

Q: Does the RoHS compliance difference affect electrical performance?

A: RoHS compliance relates to material composition and environmental restrictions, not electrical performance. Both parts deliver equivalent electrical characteristics within their specified parameter ranges. RoHS compliance is a regulatory and procurement consideration, not a performance factor.

Q: What inventory considerations apply to these parts?

A: The LC24 is available in bulk packaging with 905 units in stock. The LCE28A is available in cut tape packaging with 2040 units in stock. Bulk packaging suits component distributors and large-volume manufacturers, while cut tape supports automated pick-and-place assembly. Lead time and packaging format should align with production requirements.

Q: Can the LC24 be used in applications designed for the LCE28A?

A: The LC24's lower 24V reverse standoff voltage provides more aggressive protection than the LCE28A's 28V rating. This may cause nuisance triggering in circuits designed for the higher threshold. Use the LC24 only if the circuit design explicitly requires 24V standoff protection.