Texas Instruments SN74CBT3306CPWRE4

Overview

SN74CBT3306CPWRE4 from Texas Instruments is a dual 1-bit high-speed FET bus switch IC with bidirectional signal routing, 3 Ω typical ON-state resistance (ron), −2 V undershoot protection on A/B ports, and 0.15 ns propagation delay at 5 V. It operates from 4 V to 5.5 V and supports mixed-voltage I/O (0.8 V to 5 V) in USB interface and bus isolation applications.

For engineers reviewing the SN74CBT3306CPWRE4 datasheet, SN74CBT3306CPWRE4 pinout, SN74CBT3306CPWRE4 application, or SN74CBT3306CPWRE4 equivalent, key selection criteria include undershoot tolerance, partial-power-down (Ioff) capability, TSSOP-8 package compatibility, and TTL/CMOS-compatible control inputs.

Technical Context

The SN74CBT3306CPWRE4 implements two independent FET-based analog switches with active undershoot-protection circuitry that clamps A/B port voltages down to −2 V while maintaining OFF-state isolation. Each switch features separate OE control (1OE, 2OE) enabling independent enable/disable of 1-bit paths.

It uses Ioff partial-power-down architecture to block backflow current when VCC = 0 V, ensuring system-level isolation during power sequencing. The device supports bidirectional data flow with near-zero propagation delay due to low ron and minimal Cio(OFF) = 5 pF, making it suitable for high-fidelity signal gating in mixed-voltage domains.

Key Specifications

Pinout & Package

TSSOP-8 package (PW), 3.0 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NIPDAU/SN lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74CBT3306CPWRE4, SN74CBTD3306PWRE4 adds bus-hold functionality at higher quiescent current, while 74LVC1G3157DPWR offers lower ron but lacks undershoot protection and mixed-voltage robustness-making SN74CBT3306CPWRE4 optimal for USB and industrial bus isolation where transient immunity and voltage flexibility are critical.

Availability

SN74CBT3306CPWRE4 is available at Aetrix Electronics and suitable for USB interface design, industrial bus isolation, and low-distortion analog signal routing requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.

Supply support for SN74CBT3306CPWRE4 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 leader specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in high-reliability components.

The SN74CBT3306CPWRE4 belongs to TI's CBT (Crossbar Bus Transceiver) family, engineered for high-speed, low-distortion signal routing in mixed-voltage systems where undershoot resilience and partial-power-down safety are mandatory.

FAQ

What is the maximum undershoot voltage the SN74CBT3306CPWRE4 can tolerate on its A/B ports?

The SN74CBT3306CPWRE4 provides active undershoot protection up to −2 V on both A and B ports, verified per test conditions in the SCDS127A datasheet. This clamping function remains effective across the full operating temperature range (−40°C to 85°C) and prevents false switching or damage during negative transients, making SN74CBT3306CPWRE4 suitable for noisy industrial environments.

Does the SN74CBT3306CPWRE4 support partial-power-down operation, and how does it behave when VCC = 0 V?

Yes, the SN74CBT3306CPWRE4 supports partial-power-down via its Ioff feature. When VCC = 0 V, the device limits reverse current to ≤10 µA while maintaining high-impedance isolation between A and B ports. This behavior ensures safe hot-swap capability and prevents backfeeding into powered-down sections of the system, a key requirement in modular electronics using SN74CBT3306CPWRE4.

Can the SN74CBT3306CPWRE4 interface between 1.8-V and 5-V logic domains without external level shifters?

Yes, the SN74CBT3306CPWRE4 supports 0–5.5 V signaling on its A/B I/O ports while accepting standard TTL/CMOS control inputs (VIH ≥ 2 V, VIL ≤ 0.8 V). This allows direct connection between 1.8-V microcontrollers and 5-V peripherals, eliminating external level shifters in applications such as FPGA I/O adaptation or sensor hub interfacing using SN74CBT3306CPWRE4.

What is the typical ON-state resistance (ron) of the SN74CBT3306CPWRE4, and how does it affect signal integrity?

The SN74CBT3306CPWRE4 has a typical ON-state resistance of 3 Ω at VCC = 4.5 V and IO = 30 mA. This low ron minimizes voltage drop and insertion loss, preserving signal amplitude and edge rate-especially critical in high-speed digital gating and low-distortion analog routing applications where SN74CBT3306CPWRE4 is deployed.

Is the SN74CBT3306CPWRE4 pin-compatible with other devices in the SN74CBT3306x family?

Yes, all variants of the SN74CBT3306x series-including SN74CBT3306CPWRE4, SN74CBT3306CDR, and SN74CBT3306CPWR-share identical TSSOP-8 or SOIC-8 pinouts and functional logic. The SN74CBT3306CPWRE4 maintains full electrical and mechanical compatibility with these variants, enabling drop-in substitution based on package or tape-and-reel requirements without PCB redesign.