USB5742T-I/2G Equivalent & Substitute Parts

Part Overview

The USB5742T-I/2G is a USB Hub Controller manufactured by Microchip Technology, designed for USB 2-port hub applications with SPI interface capability. This component operates across dual supply voltages (1.2V and 3.3V) and is housed in a 56-VQFN (7x7) package with exposed pad. The part is currently classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and production continuity.

Substiute Parts

USB5742T-I/2G

Microchip TechnologyIn Stock: 2388USB5742T-I/2G Datasheet

Current PartRFQ

USB5742BT-I/2G

Microchip TechnologyIn Stock: 3554USB5742BT-I/2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the USB5742T-I/2G is determined by strict alignment of the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 56-VQFN (7x7) package with exposed pad to ensure PCB footprint compatibility without redesign.

Functional Equivalence: The substitute must perform the USB Hub Controller function with 2-port capability and maintain SPI interface support for host communication.

Supply Voltage Compatibility: The substitute must operate within overlapping voltage ranges. The USB5742T-I/2G operates at 1.2V and 3.3V. The substitute USB5742BT-I/2G operates at 1.08V ~ 1.32V and 3V ~ 3.6V, providing compatible voltage windows for both supply rails.

Thermal Operating Range: The substitute must support the same or broader operating temperature range (-40°C ~ 85°C) to maintain performance across equivalent environmental conditions.

Compliance & Certification: Both parts must maintain ROHS3 compliance, identical MSL rating (3, 168 Hours), and equivalent regulatory classifications (ECCN, HTSUS) to ensure supply chain and regulatory continuity.

USB Standards Support: While the main part specifies USB 3.1, the substitute USB5742BT-I/2G supports USB 2.0 and USB 3.2, providing backward and forward compatibility within the USB ecosystem.

Parameter Comparison

Engineering Selection Recommendations

The USB5742BT-I/2G is the manufacturer-recommended substitute for the obsolete USB5742T-I/2G. Selection is justified on the following engineering grounds:

Product Status & Availability: The USB5742BT-I/2G maintains Active product status with confirmed inventory (3451 Pcs New Original In Stock), ensuring long-term supply continuity compared to the obsolete main part.

Regulatory & Compliance Alignment: Both parts maintain identical ROHS3 compliance, MSL rating, ECCN classification (EAR99), and HTSUS code (8542.39.0001), eliminating regulatory reclassification requirements.

Electrical Compatibility: Supply voltage ranges overlap sufficiently (1.08V ~ 1.32V for 1.2V rail; 3V ~ 3.6V for 3.3V rail), permitting direct substitution in existing power delivery architectures without modification.

Package & Footprint Equivalence: Identical 56-VQFN (7x7) package with exposed pad ensures PCB layout compatibility without redesign or re-qualification.

Interface & Protocol Support: The substitute retains SPI interface support while adding SMBus capability, maintaining backward compatibility with existing host communication protocols.

Frequently Asked Questions (FAQ)

Q: Can the USB5742BT-I/2G be used as a direct replacement for the USB5742T-I/2G without PCB modifications?

A: Yes. Both parts use the identical 56-VQFN (7x7) package with exposed pad, ensuring footprint compatibility. No PCB layout changes are required.

Q: Are the supply voltage requirements compatible between these parts?

A: Yes. The USB5742T-I/2G operates at 1.2V and 3.3V. The USB5742BT-I/2G operates at 1.08V ~ 1.32V and 3V ~ 3.6V. These ranges overlap sufficiently for direct substitution in standard power delivery designs.

Q: What is the difference in USB standards support?

A: The USB5742T-I/2G supports USB 3.1. The USB5742BT-I/2G supports USB 2.0 and USB 3.2. Both maintain USB protocol compatibility for hub controller applications.

Q: Does the substitute part support the same interface protocols?

A: The USB5742T-I/2G uses SPI interface. The USB5742BT-I/2G supports both SMBus and SPI interfaces, providing equivalent SPI functionality with additional SMBus capability.

Q: Are there any compliance or regulatory differences?

A: No. Both parts maintain identical ROHS3 compliance, MSL rating (3, 168 Hours), ECCN classification (EAR99), and HTSUS code (8542.39.0001).

Q: What is the operating temperature range for the substitute part?

A: The USB5742BT-I/2G operates across -40°C ~ 85°C (TA), matching the thermal specification of the main part.

Q: Is the substitute part currently available?

A: Yes. The USB5742BT-I/2G maintains Active product status with 3451 Pcs New Original In Stock, ensuring supply continuity.