Texas Instruments SN74LVC1G18DSFR

Overview

SN74LVC1G18DSFR from Texas Instruments is a 1-of-2 noninverting demultiplexer with 3-state deselected outputs, designed for 1.65-V to 5.5-V V_CC operation. It routes input A to Y0 (when S = LOW) or Y1 (when S = HIGH), with ±24-mA output drive at 3.3 V, 3.4-ns max propagation delay, and I_off support for live insertion in data center switches and baseband units.

For engineers reviewing the SN74LVC1G18DSFR datasheet, SN74LVC1G18DSFR pinout, SN74LVC1G18DSFR application, or SN74LVC1G18DSFR equivalent, key selection criteria include its NanoFree™ 1.00 mm × 1.00 mm SON-6 package, –40°C to +125°C operating range, 5.5-V overvoltage-tolerant inputs, and 3-state output behavior enabling bus sharing in compact industrial and wireless infrastructure designs.

Technical Context

This device implements a single-channel 1:2 demultiplexing function using standard CMOS logic with balanced 3-state outputs. Its select input (S) controls output routing without inversion, while I_off circuitry disables all I/O pins during partial power-down to prevent back-drive current.

It supports voltage-level translation: inputs accept up to 5.5 V regardless of V_CC, enabling interfacing between 1.8-V, 2.5-V, 3.3-V, and 5-V domains. The 3-state outputs exhibit low ground bounce (<0.8 V) and undershoot (>2 V) at 3.3 V, critical for signal integrity in high-speed digital systems.

Key Specifications

Pinout & Package

SN74LVC1G18DSFR uses a 1.00 mm × 1.00 mm NanoFree™ SON-6 package - the die itself serves as the package, eliminating bond wires and mold compound for ultra-low profile (0.35 mm typical height) and improved thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 1-of-2 noninverting demultiplexer applications.

Compared with SN74LVC1G175DSFR and SN74LVC1G3157DSFR, the SN74LVC1G18DSFR uniquely combines digital demultiplexing, 3-state isolation, and overvoltage-tolerant inputs - making it irreplaceable for logic-level signal routing where bus contention avoidance and mixed-voltage compatibility are mandatory.

Availability

SN74LVC1G18DSFR is available at Aetrix Electronics and suitable for data center switches, baseband units, and Wi-Fi access points requiring stable component supply across automotive-grade temperature ranges and long production lifecycles.

Supply support for SN74LVC1G18DSFR 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 communications markets.

The SN74LVC1G18DSFR belongs to TI's LVC logic family - engineered for low-voltage, high-speed operation with robust noise immunity and mixed-voltage interface capability in space- and power-constrained systems.

FAQ

What is the package type and dimensions of the SN74LVC1G18DSFR?

The SN74LVC1G18DSFR uses a NanoFree™ 6-pin SON package measuring 1.00 mm × 1.00 mm with a typical height of 0.35 mm. This die-as-package construction eliminates traditional leadframe and molding, achieving the smallest footprint in TI's LVC demultiplexer portfolio and enabling ultra-thin PCB designs for notebook PCs and wired speakers.

Does the SN74LVC1G18DSFR support level shifting between different supply voltages?

Yes, the SN74LVC1G18DSFR supports down-translation: its inputs accept voltages up to 5.5 V regardless of V_CC, allowing 5-V control signals to safely interface with a 1.8-V or 2.5-V system. This eliminates external level shifters in mixed-voltage baseband units and active antenna systems where SN74LVC1G18DSFR is deployed.

How does the I_off feature work in the SN74LVC1G18DSFR?

The I_off circuitry in the SN74LVC1G18DSFR disables all inputs and outputs when V_CC = 0 V, limiting leakage to ±10 µA. This prevents back-drive current from neighboring powered circuits during hot-swap events - a critical requirement for SN74LVC1G18DSFR use in data center switch line cards and industrial monitor expansion modules.

What is the maximum capacitive load the SN74LVC1G18DSFR can drive while maintaining specified timing?

The SN74LVC1G18DSFR is characterized for CL ≤ 50 pF in its switching specifications, with guaranteed t_pd ≤ 3.4 ns at 3.3 V. While loads up to 70 pF are usable, TI recommends staying within 50 pF for full datasheet compliance - especially in SN74LVC1G18DSFR applications like Wi-Fi access point antenna control where timing margin is critical.

Can unused inputs on the SN74LVC1G18DSFR be left floating?

No - all unused inputs on the SN74LVC1G18DSFR must be tied to V_CC or GND to prevent undefined logic states and excessive current draw. TI specifies this in the Recommended Operating Conditions; for example, in SN74LVC1G18DSFR-based coffee machine control boards, unconnected S or A inputs have caused erratic demux behavior until properly terminated with 10-kΩ pull-up/down resistors.