74CB3Q3305DCURE4

Overview

The 74CB3Q3305DCURE4 is a dual FET bus switch manufactured by Texas Instruments. It operates within a supply voltage range of 2.3 V to 3.6 V and supports data I/O voltages from 0 V to 5.5 V. The device features two independent switches with typical ON-state resistance (ron) of 3 Ω at 3.3 V and 3.5 Ω at 2.5 V. It provides high-bandwidth data paths up to 500 MHz, low input/output capacitance of 3.5 pF typical, and near-zero propagation delay. The component is housed in an 8-pin VSSOP package.

Feature Summary

• High-bandwidth data path supporting frequencies up to 500 MHz
• Low and flat ON-state resistance for minimal signal distortion
• Ioff circuitry enables partial-power-down mode operation
• 5-V tolerant I/Os compatible with various logic levels

Applications

• Wired and wireless IP phones
• Optical modules and networking equipment
• Video over fiber and EPON systems
• USB and differential signal interfaces

Procurement Notes

Verify the specific ordering suffix DCURE4 corresponds to the VSSOP-8 package and lead finish details. Confirm RoHS compliance status and moisture sensitivity level requirements for your assembly process. Ensure control inputs are tied to valid logic levels during operation to prevent undefined states.

Selection Notes

Select this component when bidirectional switching between 2.5-V and 3.3-V domains with 5-V tolerant I/Os is required. The low on-resistance and capacitance make it suitable for high-speed data buses. Verify that the operating temperature range of -40°C to 85°C meets system environmental constraints.

Part Context

This part belongs to the SN74CB3Q family of low-voltage, high-bandwidth bus switches. It utilizes a charge pump to maintain low ON-state resistance across the entire operating voltage and temperature range. The device is designed for applications requiring fast switching and minimal signal degradation on data-intensive interfaces.

Replacement Considerations

SN74CB3Q3305DCUR is a direct equivalent variant within the same product line.