Texas Instruments 74CB3Q3306ADCURG4

Overview

74CB3Q3306ADCURG4 from Texas Instruments is a dual 1-bit FET bus switch optimized for high-bandwidth signal routing in 2.5-V/3.3-V systems. It features bidirectional switching, 4 Ω typical ON-state resistance (ron), rail-to-rail 0–5 V signal support, and 5-V-tolerant I/Os with VCC powered up or down. Used in USB interface isolation and differential signal gating where low distortion and sub-nanosecond propagation delay are critical.

For engineers reviewing the 74CB3Q3306ADCURG4 datasheet, 74CB3Q3306ADCURG4 pinout, 74CB3Q3306ADCURG4 application, or 74CB3Q3306ADCURG4 equivalent, key selection criteria include partial-power-down Ioff capability, 20 MHz maximum OE switching frequency, 3.5 pF typical OFF-state I/O capacitance, and VSSOP-8 (DCU) package compatibility with high-density PCB layouts.

Technical Context

The 74CB3Q3306ADCURG4 implements two independent FET-based bus switches with charge-pump-enhanced gate drive to maintain flat, low ron across input voltage (VI) from 0 V to 5 V. Each switch has separate output-enable inputs (1OE, 2OE) supporting independent control of 1A↔1B and 2A↔2B paths.

It operates over VCC = 2.3 V to 3.6 V, supports 0–5 V signaling on data I/Os regardless of VCC level (e.g., 0–5 V switching with 3.3-V VCC), and includes undershoot clamp diodes on all data and control inputs. Ioff circuitry ensures isolation during partial power-down, preventing backflow current when VCC = 0 V.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.3 mm × 2.0 mm footprint, 0.5 mm pitch, 0.9 mm max height, lead-free NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus switch applications.

Compared with SN74CB3Q3306APWR and 74CBTLV3306PWR, the 74CB3Q3306ADCURG4 delivers superior high-frequency performance per unit area due to its VSSOP-8 package, lower Cio(OFF), and flatter ron profile - making it optimal for space-constrained, multi-gigabit signal routing where signal fidelity and density are prioritized.

Availability

74CB3Q3306ADCURG4 is available at Aetrix Electronics and suitable for USB interface isolation, differential signal gating, and FPGA I/O expansion requiring stable component supply across industrial temperature ranges (–40°C to 85°C).

Supply support for 74CB3Q3306ADCURG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies with broad industrial and automotive design expertise.

The CB3Q family, including the 74CB3Q3306ADCURG4, was designed for high-bandwidth, low-distortion signal routing in communications infrastructure, networking equipment, and data-intensive computing systems.

FAQ

What is the maximum operating frequency supported by the 74CB3Q3306ADCURG4 for data signals?

The 74CB3Q3306ADCURG4 supports high-bandwidth data paths up to 500 MHz, enabled by its low 3.5 pF OFF-state I/O capacitance and 4 Ω typical ON-state resistance. This specification is validated under recommended operating conditions (VCC = 2.3–3.6 V, TA = –40°C to 85°C) and applies to bidirectional signal routing without level translation. Performance remains stable across 0–5 V signal swings.

Does the 74CB3Q3306ADCURG4 support partial-power-down operation?

Yes, the 74CB3Q3306ADCURG4 includes Ioff circuitry that actively blocks current flow between A and B ports when VCC = 0 V, limiting Ioff to 1 mA maximum. This feature prevents backfeeding and latch-up during power sequencing or hot-swap events, ensuring safe operation in systems with staggered power rails. The device maintains high-impedance isolation even with 0–5.5 V present on I/O pins.

What is the pin-compatible alternative to the 74CB3Q3306ADCURG4 in TSSOP-8 packaging?

The SN74CB3Q3306APWR is the functionally identical TSSOP-8 (PW) variant of the 74CB3Q3306ADCURG4, sharing the same electrical specifications, logic behavior, and functional pinout. Its larger 4.3 mm × 3.1 mm footprint and higher thermal resistance (θJA = 88°C/W) make it suitable for designs where board space is available and thermal constraints permit.

Can the 74CB3Q3306ADCURG4 interface between 3.3-V and 5-V logic domains without external components?

Yes, the 74CB3Q3306ADCURG4 supports 0–5 V signaling on all data and control I/Os while powered from 2.3–3.6 V VCC - enabling direct connection between 3.3-V controllers and 5-V peripherals. Its 5-V-tolerant inputs eliminate the need for discrete level shifters or resistive dividers in USB, sensor, or legacy interface applications.

What is the typical ON-state resistance (ron) of the 74CB3Q3306ADCURG4 and how does it vary with input voltage?

The 74CB3Q3306ADCURG4 exhibits a typical ron of 4 Ω at VCC = 3.3 V and VI = 0 V, rising to 5–6 Ω across VI = 0–5 V. Its charge-pump architecture ensures flat ron response - variation stays within ±1 Ω over most of the range - minimizing signal-dependent insertion loss and preserving rise/fall time consistency in high-speed digital and analog paths.