USB50805C-A/TR13 Equivalent & Substitute Parts

Part Overview

The USB50805C-A/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 with 893 pieces available in inventory.

Finding equivalent and substitute parts becomes necessary when addressing supply chain constraints, lead time requirements, or when design specifications permit alternative electrical characteristics within acceptable operating parameters. Substitute parts must maintain compatibility with the 8-SOIC package footprint and preserve core protection functionality for the target application.

Substiute Parts

USB50805C-A/TR13

Microchip TechnologyIn Stock: 915USB50805C-A/TR13 Datasheet

Current PartRFQ

SMDA05C.TBT

Semtech CorporationIn Stock: 8161SMDA05C.TBT Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Package Compatibility: Both the main part and substitute must use the 8-SOIC (0.154", 3.90mm Width) surface-mount package to ensure PCB footprint compatibility without redesign.

Voltage Protection Characteristics: The reverse standoff voltage (5V typical) and breakdown voltage (6V minimum) establish the trigger threshold for TVS activation. Substitute parts must maintain these voltage thresholds to protect the same circuit nodes.

Clamping Voltage: The maximum clamping voltage of 13V at peak pulse current defines the maximum transient voltage the protected circuit will experience. Substitute parts with lower clamping voltages provide enhanced protection; higher clamping voltages may exceed component ratings in the protected circuit.

Peak Pulse Current Rating: The 5A (8/20µs) specification indicates the surge current the TVS must safely conduct. Substitute parts with equal or higher current ratings maintain or improve protection capability.

Bidirectional Channel Configuration: The 2-channel bidirectional configuration protects differential signal pairs. Substitute parts with 4-channel configurations provide additional protection channels but remain compatible with 2-channel applications through selective use.

Operating Temperature Range: The -55°C to 150°C range defines the thermal operating envelope. Substitute parts must support this range or a subset thereof to ensure reliability across the intended application environment.

Parameter Comparison

Engineering Selection Recommendations

SMDA05C.TBT Substitution Criteria:

The SMDA05C.TBT from Semtech Corporation qualifies as a functional substitute for the USB50805C-A/TR13 based on the following engineering parameters:

Package Compatibility: Both devices use identical 8-SOIC (0.154", 3.90mm Width) surface-mount packaging, enabling direct PCB footprint compatibility without layout modifications.

Voltage Protection Alignment: Both parts maintain 5V reverse standoff voltage and 6V minimum breakdown voltage, ensuring equivalent trigger thresholds for transient event detection.

Clamping Voltage Advantage: The SMDA05C.TBT provides 11V maximum clamping voltage compared to 13V for the USB50805C-A/TR13. This lower clamping voltage delivers superior transient suppression, reducing peak voltage stress on protected components.

Peak Pulse Current Enhancement: The SMDA05C.TBT supports 17A peak pulse current versus 5A for the USB50805C-A/TR13, providing increased surge handling capacity and improved protection margin.

Compliance Status: The SMDA05C.TBT holds ROHS3 compliance, whereas the USB50805C-A/TR13 is RoHS non-compliant. Selection of the SMDA05C.TBT satisfies regulatory requirements in applications subject to RoHS directives.

Temperature Range Consideration: The SMDA05C.TBT operates across -55°C to 125°C, which is 25°C narrower than the USB50805C-A/TR13 (-55°C to 150°C). Verification of the application's maximum operating temperature requirement is necessary to confirm compatibility.

Capacitance Difference: The SMDA05C.TBT exhibits 350pF capacitance at 1MHz compared to 3pF for the USB50805C-A/TR13. This higher capacitance may affect high-frequency signal integrity in bandwidth-sensitive applications such as high-speed Ethernet interfaces.

Frequently Asked Questions (FAQ)

Q: Can the SMDA05C.TBT directly replace the USB50805C-A/TR13 without PCB modifications?

A: Yes. Both devices use the 8-SOIC (0.154", 3.90mm Width) package with identical pin configurations and footprints. No PCB layout changes are required for mechanical and electrical connectivity.

Q: What is the significance of the lower 11V clamping voltage in the SMDA05C.TBT?

A: Lower clamping voltage reduces the peak transient voltage that reaches protected components, providing enhanced protection. The SMDA05C.TBT's 11V clamping is 2V lower than the USB50805C-A/TR13's 13V, resulting in reduced stress on downstream circuitry during transient events.

Q: Does the higher capacitance of the SMDA05C.TBT affect signal integrity?

A: The SMDA05C.TBT's 350pF capacitance at 1MHz is significantly higher than the USB50805C-A/TR13's 3pF. In high-frequency applications, this increased capacitance may introduce signal attenuation or phase shift. Applications operating below 100 MHz typically experience negligible effects; high-speed Ethernet (1 GbE and above) requires verification through signal integrity analysis.

Q: Why does the SMDA05C.TBT have 4 bidirectional channels instead of 2?

A: The SMDA05C.TBT integrates 4 protection channels within the same 8-SOIC package, providing protection for additional signal pairs or differential lines. In applications requiring only 2-channel protection, the additional channels remain unused but do not degrade performance.

Q: Is the SMDA05C.TBT suitable for applications requiring operation above 125°C?

A: No. The SMDA05C.TBT's maximum operating temperature is 125°C, whereas the USB50805C-A/TR13 supports 150°C. Applications with maximum junction temperatures exceeding 125°C require the USB50805C-A/TR13 or alternative parts with higher temperature ratings.

Q: What is the advantage of ROHS3 compliance in the SMDA05C.TBT?

A: ROHS3 compliance indicates the device meets Restriction of Hazardous Substances directives, restricting lead, cadmium, mercury, and other hazardous materials. Applications subject to RoHS regulations, including consumer electronics and EU-market products, require ROHS3-compliant components. The USB50805C-A/TR13's RoHS non-compliance may restrict its use in regulated markets.

Q: Can the SMDA05C.TBT's higher 17A peak pulse current rating be utilized in the same circuit as the USB50805C-A/TR13?

A: Yes. The SMDA05C.TBT's 17A rating exceeds the USB50805C-A/TR13's 5A specification, providing additional surge handling capacity. The circuit design determines actual peak pulse current; the higher rating ensures the SMDA05C.TBT operates within safe margins under identical transient conditions.

Q: What inventory considerations apply to these parts?

A: The USB50805C-A/TR13 has 893 pieces in stock, while the SMDA05C.TBT has 8076 pieces available. The SMDA05C.TBT's significantly higher inventory may provide supply chain advantages for high-volume production or urgent procurement requirements.