LC24A Transient Voltage Suppressor (TVS) Equivalent & Substitute Parts

Part Overview

The LC24A is an active Microchip Technology transient voltage suppressor diode designed for general-purpose overvoltage protection applications. This unidirectional zener-type TVS diode features a 24V reverse standoff voltage with a maximum clamping voltage of 38.9V at peak pulse current. The device is packaged in a through-hole DO-13 (DO-202AA) configuration and operates across an extended temperature range of -65°C to 175°C.

The LC24A maintains active product status with 1021 units currently in stock. Identification of equivalent and substitute parts becomes necessary when addressing supply chain constraints, packaging preferences, compliance requirements, or specific application performance parameters that may benefit from alternative electrical characteristics within the TVS diode category.

Substiute Parts

LC24A

Microchip TechnologyIn Stock: 1087LC24A Datasheet

Current PartRFQ

LCE28A

Littelfuse Inc.In Stock: 2122LCE28A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LC24A with alternative TVS diodes is determined by electrical parameter compatibility within the transient voltage suppression category. The primary substitution criteria are:

Voltage Parameters: The reverse standoff voltage, breakdown voltage, and clamping voltage must remain within acceptable tolerance ranges for the protected circuit. The LC24A operates at 24V standoff with a 38.9V maximum clamp.

Current Handling: Peak pulse current capacity (39A for the LC24A) must meet or exceed the transient energy requirements of the application.

Power Dissipation: Peak pulse power rating (1500W) establishes the thermal management capability during transient events.

Thermal Performance: Operating temperature range (-65°C to 175°C) ensures functionality across the intended deployment environment.

Packaging and Mounting: Through-hole configuration and DO-series package compatibility determine physical and electrical interface requirements.

The LCE28A from Littelfuse Inc. is identified as a substitute part. While it operates at a higher standoff voltage (28V) and exhibits different clamping characteristics (45.5V), it maintains equivalent peak pulse power rating (1500W) and through-hole mounting compatibility. The LCE28A is suitable for applications requiring higher voltage protection thresholds within the same power dissipation envelope.

Parameter Comparison

Engineering Selection Recommendations

LC24A Selection Criteria: The LC24A remains the primary choice for applications requiring a 24V protection threshold with maximum clamping at 38.9V. This device offers the highest peak pulse current capacity (39A) and maintains full operational capability across the extended lower temperature limit (-65°C). The LC24A is RoHS non-compliant; applications subject to RoHS3 compliance requirements must evaluate alternative solutions.

LCE28A Selection Criteria: The LCE28A is suitable for circuits requiring higher voltage protection thresholds (28V standoff, 45.5V clamp). This substitute maintains equivalent peak pulse power dissipation (1500W) and offers RoHS3 compliance, addressing regulatory requirements where applicable. The LCE28A operates within a narrower lower temperature range (-55°C minimum), which may limit deployment in extreme cold environments. Peak pulse current capacity is reduced to 33A compared to the LC24A.

Compliance Considerations: The LC24A carries RoHS non-compliant status. The LCE28A is RoHS3 compliant. Both devices are REACH unaffected and classified under ECCN EAR99. Selection between these parts should account for end-product regulatory requirements and supply chain compliance mandates.

Packaging Compatibility: The LC24A uses DO-13 (DO-202AA) packaging. The LCE28A offers multiple package options including DO-201AA, DO-27, and axial configurations. Physical board layout and PCB footprint requirements determine packaging suitability.

Frequently Asked Questions (FAQ)

Q: Can the LCE28A directly replace the LC24A in all applications?

A: Direct replacement depends on circuit voltage requirements. The LCE28A operates at a higher standoff voltage (28V vs. 24V) and exhibits higher clamping voltage (45.5V vs. 38.9V). Circuits designed for 24V protection will experience different transient suppression characteristics with the LCE28A. Substitution is valid only when the protected circuit can tolerate the higher voltage thresholds.

Q: What is the significance of the different peak pulse current ratings?

A: The LC24A provides 39A peak pulse current capacity while the LCE28A provides 33A. Both devices deliver equivalent peak pulse power (1500W). The difference in current capacity reflects different impedance characteristics. Applications with high transient current demands may require the LC24A's superior current handling.

Q: Are there temperature range limitations when substituting the LCE28A?

A: The LCE28A operates from -55°C to 175°C, compared to the LC24A's -65°C to 175°C range. The LCE28A cannot be deployed in applications requiring operation below -55°C. Verify minimum operating temperature requirements before substitution.

Q: How do packaging differences affect circuit board design?

A: The LC24A uses DO-13 (DO-202AA) packaging. The LCE28A offers DO-201AA, DO-27, and axial options. Each package has distinct footprint dimensions and lead spacing. PCB layout modifications may be necessary when switching between these packages. Verify footprint compatibility with existing board designs.

Q: What compliance differences exist between these parts?

A: The LC24A is RoHS non-compliant while the LCE28A is RoHS3 compliant. Both are REACH unaffected. Products destined for markets with RoHS3 requirements must use the LCE28A or identify alternative compliant solutions.

Q: Can capacitance specifications influence substitution decisions?

A: The LC24A specifies 100pF capacitance at 1MHz. The LCE28A does not provide capacitance data in the available specifications. High-frequency circuit applications sensitive to parasitic capacitance effects should verify LCE28A capacitance characteristics through the manufacturer before substitution.

Q: What inventory considerations apply to these parts?

A: The LC24A has 1021 units in stock (Bulk packaging). The LCE28A has 2040 units available (Cut Tape packaging). Packaging format differences may affect procurement workflows and minimum order quantities.