USB50805C/TR13 Equivalent & Substitute Parts

Part Overview

The USB50805C/TR13 is a bidirectional transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for protection in Ethernet applications. This surface-mount component operates with a 5V reverse standoff voltage and provides 13V clamping at peak pulse current. The device is classified as Active product status and is currently in production.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter tolerances while maintaining compatibility with the 8-SOIC package footprint. Substitution becomes necessary due to inventory availability, supply chain considerations, or design flexibility requirements.

Substiute Parts

USB50805C/TR13

Microchip TechnologyIn Stock: 1006USB50805C/TR13 Datasheet

Current PartRFQ

LCDA05.TBT

Semtech CorporationIn Stock: 18303LCDA05.TBT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the USB50805C/TR13 is determined by the following critical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff: 5V (matching specification)
• Voltage - Breakdown (Min): 6V (matching specification)
• Current - Peak Pulse (8/20µs): 5A (matching specification)
• Bidirectional Channels: 2 (matching specification)

Mechanical Compatibility Criteria:

• Package / Case: 8-SOIC (0.154", 3.90mm Width) footprint
• Mounting Type: Surface Mount

Acceptable Variation:

• Voltage - Clamping (Max) @ Ipp: Substitute parts with clamping voltage at or below the main part specification (13V maximum) are acceptable, as lower clamping voltages provide equivalent or superior transient suppression performance.

The LCDA05.TBT from Semtech Corporation meets all substitution criteria with an 11V clamping voltage, which operates within the acceptable range for this application category.

Parameter Comparison

Engineering Selection Recommendations

Primary Part (USB50805C/TR13): The USB50805C/TR13 maintains Active product status with established supply availability (941 pcs in stock). This part is suitable for applications requiring the full -55°C to 150°C operating temperature range and 500W peak pulse power rating. The part is RoHS non-compliant, which may be acceptable for legacy designs or applications without RoHS requirements.

Substitute Part (LCDA05.TBT): The LCDA05.TBT from Semtech Corporation is suitable as a direct substitute where the following conditions are met:

• Operating temperature requirements do not exceed 125°C (TJ)
• Peak pulse power dissipation does not exceed 300W
• RoHS3 compliance is required or preferred
• Lower clamping voltage (11V vs. 13V) is acceptable for the application

The LCDA05.TBT offers superior inventory availability (18,251 pcs in stock) and improved regulatory compliance status. The lower clamping voltage provides enhanced transient suppression performance in Ethernet protection applications.

Frequently Asked Questions (FAQ)

Q: Can the LCDA05.TBT replace the USB50805C/TR13 in existing designs?

A: Yes, the LCDA05.TBT is electrically and mechanically compatible for applications where the operating temperature does not exceed 125°C and peak pulse power remains below 300W. The lower clamping voltage (11V) provides equivalent or superior transient suppression performance.

Q: What is the significance of the different clamping voltages (13V vs. 11V)?

A: The clamping voltage determines the maximum voltage the TVS diode allows across its terminals during a transient event. The LCDA05.TBT's 11V clamping voltage is lower than the USB50805C/TR13's 13V specification, which results in more aggressive transient suppression. This is compatible with the application and does not represent a limitation.

Q: Are both parts pin-compatible?

A: Yes. Both parts use the 8-SOIC (0.154", 3.90mm Width) package with identical pinout and footprint. No PCB layout modifications are required for substitution.

Q: What is the difference in RoHS compliance between these parts?

A: The USB50805C/TR13 is RoHS non-compliant, while the LCDA05.TBT is ROHS3 compliant. If your application or supply chain requires RoHS3 compliance, the LCDA05.TBT is the appropriate selection.

Q: How do the operating temperature ranges differ?

A: The USB50805C/TR13 operates from -55°C to 150°C (TJ), while the LCDA05.TBT operates from -55°C to 125°C (TJ). For applications requiring operation above 125°C, the USB50805C/TR13 is required. For standard industrial and commercial temperature ranges, both parts are suitable.

Q: What is the impact of the different peak pulse power ratings?

A: The USB50805C/TR13 is rated for 500W peak pulse power, while the LCDA05.TBT is rated for 300W. For applications with peak pulse power dissipation below 300W, both parts are suitable. For higher power transient events, the USB50805C/TR13 is required.

Q: Are there any differences in capacitance that affect circuit performance?

A: The USB50805C/TR13 has 3pF capacitance at 1MHz, while the LCDA05.TBT has 5pF. This minor variation (2pF difference) is negligible for Ethernet protection applications and does not affect substitution compatibility.