USB50824C/TR7 Equivalent & Substitute Parts

Part Overview

The USB50824C/TR7 is a Transient Voltage Suppressor (TVS) diode manufactured by Microchip Technology, designed for surface mount applications in Ethernet protection circuits. This bidirectional 24V Zener device is currently in active production status. Alternative component identification becomes necessary when primary suppliers have limited inventory availability, require alternative sourcing channels, or when design specifications allow for compatible derivatives meeting equivalent electrical and mechanical criteria.

Substiute Parts

USB50824C/TR7

Microchip TechnologyIn Stock: 834USB50824C/TR7 Datasheet

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LCDA24.TBT

Semtech CorporationIn Stock: 3957LCDA24.TBT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the USB50824C/TR7 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Criteria:

• Bidirectional channel configuration: 2 channels
• Reverse standoff voltage: 24V
• Breakdown voltage minimum: 26.7V
• Package type: 8-SOIC (0.154", 3.90mm Width)
• Peak pulse current rating: 5A (8/20µs)
• Mounting type: Surface Mount

Secondary Parameters:

• Clamping voltage maximum @ Ipp
• Peak pulse power rating
• Operating temperature range
• Capacitance characteristics
• Compliance certifications

The LCDA24.TBT from Semtech Corporation meets the primary electrical criteria with identical standoff voltage, breakdown voltage, channel configuration, and peak pulse current. Both devices share the same 8-SOIC package footprint and surface mount technology. Variations exist in clamping voltage specification (55V vs. 57V), peak pulse power capability (300W vs. 500W), and compliance status.

Parameter Comparison

Engineering Selection Recommendations

Primary Device (USB50824C/TR7): This Microchip device maintains active product status. Selection is appropriate for legacy design continuity where the existing part number is established in production documentation. The RoHS non-compliant status requires consideration within supply chain and regulatory frameworks applicable to the end-use application.

Substitute Device (LCDA24.TBT): The Semtech LCDA24.TBT substitute offers ROHS3 compliance, addressing regulatory requirements where RoHS adherence is mandated. This device shares identical standoff voltage, breakdown voltage, channel configuration, peak pulse current, package footprint, and mounting technology. The lower clamping voltage specification (55V vs. 57V) and reduced peak pulse power rating (300W vs. 500W) require circuit-level evaluation to confirm adequacy within specific application parameters. The narrower operating temperature range (-55°C to 125°C vs. -55°C to 150°C) may be limiting in high-temperature environments. Both devices maintain MSL Level 1 moisture sensitivity and active product status.

Frequently Asked Questions (FAQ)

Q: Can the LCDA24.TBT replace the USB50824C/TR7 directly in PCB assembly without layout modifications?

A: Yes. Both devices share the identical 8-SOIC package footprint (0.154" width, 3.90mm), surface mount technology, and pin configuration for bidirectional TVS diode applications. PCB layout and footprint remain unchanged.

Q: What is the significance of the 2V difference in clamping voltage (57V vs. 55V)?

A: Clamping voltage determines the maximum voltage presented to protected circuitry during transient events. The USB50824C/TR7 clamps at 57V maximum, while the LCDA24.TBT clamps at 55V maximum. This 2V differential represents improved overvoltage suppression with the Semtech device. Circuit-level transient analysis is required to confirm the lower clamping voltage remains within acceptable margins for the protected circuit.

Q: Why does the USB50824C/TR7 support 500W peak pulse power while the LCDA24.TBT supports only 300W?

A: Peak pulse power ratings reflect device thermal dissipation capability during transient suppression events. The higher rating on the Microchip device indicates greater thermal design margin for high-energy transients. Substitution feasibility depends on the actual transient energy profile specified in circuit design documentation.

Q: Does RoHS compliance status affect electrical performance or substitutability?

A: RoHS compliance status does not affect electrical performance or functional substitutability. It reflects manufacturing process constraints regarding restricted hazardous substances. ROHS3 compliance of the LCDA24.TBT is significant for supply chain and regulatory compliance in jurisdictions where RoHS adherence is mandatory.

Q: Are there constraints related to the 25°C difference in maximum operating temperature?

A: The USB50824C/TR7 operates to 150°C (TJ), while the LCDA24.TBT operates to 125°C (TJ). This 25°C difference may be limiting for applications requiring operation in high-temperature environments or where thermal design margins are minimal. Application-specific thermal analysis determines whether the lower temperature specification is acceptable.

Q: How do capacitance differences between the two devices affect circuit performance?

A: The USB50824C/TR7 exhibits 3pF capacitance at 1MHz, while the LCDA24.TBT exhibits 5pF. Higher capacitance can affect signal integrity on high-speed data lines. For Ethernet protection applications, this differential may require circuit simulation to confirm compatibility, particularly in high-frequency signal paths.