Texas Instruments 74CBT1G384DBVRG4

Overview

74CBT1G384DBVRG4 from Texas Instruments is a single-channel FET bus switch used for high-speed digital signal routing in 5-V systems. It features 5-Ω on-state resistance, TTL-compatible control input levels (VIH = 2 V, VIL = 0.8 V), and operates from –40°C to 85°C. It serves as an active-low enable-controlled bidirectional switch between A and B ports in data path isolation applications.

For engineers reviewing the 74CBT1G384DBVRG4 datasheet, 74CBT1G384DBVRG4 pinout, 74CBT1G384DBVRG4 application, or 74CBT1G384DBVRG4 equivalent, key selection criteria include on-resistance consistency at 4–5.5 V supply, sub-1 ns propagation delay, low 3 pF control input capacitance, and SOT-23 (DBV) package compatibility with space-constrained PCB layouts.

Technical Context

This device implements a single NMOS transmission gate with no internal level-shifting circuitry. Its OE input directly controls conduction between A and B terminals using a standard TTL logic threshold, enabling seamless integration into 5-V CMOS/TTL logic families without external biasing.

The switch exhibits symmetric bidirectional behavior with typical on-resistance of 5 Ω at VCC = 4.5 V and II = 30 mA, and maintains low off-capacitance (4 pF) to minimize signal crosstalk during disable. Propagation delay is dominated by RC time constant of r_on and load capacitance, not gate drive timing.

Key Specifications

Pinout & Package

SOT-23 (DBV) 5-pin plastic package, 1.45 mm max height, JEDEC MO-178 compliant, footprint compatible with standard SOT-23 land patterns (1.9 mm × 2.6 mm body, 0.95 mm pin pitch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G3157DBVR and 74AUP1G3157GW,125, the 74CBT1G384DBVRG4 delivers the lowest on-resistance and fastest propagation in 5-V-only systems, making it optimal for timing-critical bus isolation where signal fidelity outweighs voltage flexibility or ultra-low power.

Availability

74CBT1G384DBVRG4 is available at Aetrix Electronics and suitable for industrial automation interfaces, embedded communication modules, and FPGA-based prototyping platforms requiring stable component supply and long-term manufacturability.

Supply support for 74CBT1G384DBVRG4 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The CBT (CrossBar Technology) family, including the 74CBT1G384DBVRG4, was engineered specifically for high-speed, low-distortion digital signal routing in 5-V logic systems with strict timing and impedance requirements.

FAQ

What is the maximum continuous current rating for the 74CBT1G384DBVRG4?

The 74CBT1G384DBVRG4 supports a maximum continuous channel current of 128 mA, verified under recommended operating conditions (VCC = 4–5.5 V, TA = –40°C to 85°C). This rating applies to steady-state DC conduction through the A–B switch path and assumes adequate PCB copper area for thermal dissipation. Exceeding this current may cause thermal runaway due to the device's 206°C/W junction-to-ambient thermal resistance in the DBV package.

Does the 74CBT1G384DBVRG4 support level shifting between different logic families?

No, the 74CBT1G384DBVRG4 does not provide voltage level translation. It operates only at the VCC supply voltage applied to Pin 5 and passes signals bi-directionally with no internal biasing or threshold adjustment. When used between mismatched logic families (e.g., 3.3-V MCU and 5-V peripheral), external level shifters or clamping circuits are required to avoid violating absolute maximum input ratings (VI = –0.5 V to 7 V).

What is the function of the OE pin on the 74CBT1G384DBVRG4?

The OE (Output Enable) pin on the 74CBT1G384DBVRG4 is an active-low control input that enables conduction between A and B terminals when driven low (≤0.8 V) and disconnects them when driven high (≥2 V). During high-OE state, the A and B ports present high-impedance isolation with only 4 pF off-capacitance, preventing signal leakage or loading in bus-sharing configurations.

Can the 74CBT1G384DBVRG4 be used in hot-swap applications?

Yes, the 74CBT1G384DBVRG4 supports hot-swap operation due to its undervoltage lockout-free design and robust ESD protection (per JEDEC JS-001 Class 2). Its OE pin allows controlled turn-on after power stabilization, and the 5-Ω r_on limits inrush current during plug-in events. However, external series resistors or slew-rate limiting may still be needed on A/B lines to meet system-level hot-swap specifications.

Is the 74CBT1G384DBVRG4 RoHS compliant and lead-free?

Yes, the 74CBT1G384DBVRG4 is RoHS compliant and lead-free, with "Green (RoHS & no Sb/Br)" eco plan designation and CU NIPDAU | CU SN lead finish. It meets JEDEC MSL Level-1 moisture sensitivity classification and is qualified for lead-free reflow soldering at peak temperatures up to 260°C, as documented in TI's packaging addendum dated 11-May-2019.