Texas Instruments SN74LVC1G18DBVRG4

Overview

SN74LVC1G18DBVRG4 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 buffered input A to either Y0 or Y1 based on select input S (LOW → Y0, HIGH → Y1), features ±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 SN74LVC1G18DBVRG4 datasheet, SN74LVC1G18DBVRG4 pinout, SN74LVC1G18DBVRG4 application, or SN74LVC1G18DBVRG4 equivalent, this page delivers verified functional mode behavior, confirmed thermal metrics for SOT-23-6, real-world 3-state timing constraints, and precise I_off/V_I tolerance specs critical for partial-power-down system design.

Technical Context

The SN74LVC1G18DBVRG4 implements a single-channel 1-of-2 demux with noninverting data path and independent 3-state control via S input. Its balanced CMOS outputs deliver symmetrical ±24-mA drive at 3.3 V while maintaining VOL ≤ 0.55 V and VOH ≥ 2.3 V under full load.

It supports down-translation (inputs tolerate up to 5.5 V independent of V_CC) and includes I_off circuitry that disables all I/Os during power-down, limiting leakage to ±10 µA and enabling hot-plug capability in industrial monitors and Wi-Fi access points.

Key Specifications

Pinout & Package

SOT-23 (6-pin) package with 2.90 mm × 2.80 mm body size and NanoFree™ die-as-package construction for minimal PCB footprint and thermal resistance (R_θJA = 236.1°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G18DBVRG4, SN74LVC1G18DBVT offers identical performance with optimized packaging for SMT lines, while SN74LVC1G19DBVR introduces mandatory logic inversion - making DBVRG4 the only drop-in solution for noninverting 1-of-2 routing in safety-critical industrial monitors and BBU designs.

Availability

SN74LVC1G18DBVRG4 is available at Aetrix Electronics and suitable for data center switches, baseband units, and Wi-Fi access points requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC1G18DBVRG4 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 delivering analog, embedded processing, and connectivity solutions with over 90 years of innovation in power management, signal chain, and logic devices.

The SN74LVC1G18DBVRG4 belongs to TI's LVC low-voltage CMOS logic family, engineered for high-speed, low-power signal routing in space-constrained, thermally demanding applications such as 5G infrastructure and industrial IoT edge nodes.

FAQ

What is the maximum capacitive load SN74LVC1G18DBVRG4 can drive while meeting datasheet timing specs?

The SN74LVC1G18DBVRG4 is characterized for CL ≤ 50 pF in switching specifications, with guaranteed t_pd ≤ 3.4 ns at 3.3 V. While it can drive up to 70 pF per application guidance, exceeding 50 pF may increase propagation delay beyond datasheet limits and degrade edge fidelity - especially at 125°C. For reliable 3.4-ns performance, keep total load (trace + receiver input + probe) ≤ 50 pF in SN74LVC1G18DBVRG4 designs.

Does SN74LVC1G18DBVRG4 support mixed-voltage operation where input signals exceed V_CC?

Yes. SN74LVC1G18DBVRG4 inputs (A and S) tolerate voltages up to 5.5 V regardless of V_CC level - enabling direct connection to 5-V microcontrollers while powered from a 3.3-V rail. This over-voltage tolerance is explicitly specified in the Recommended Operating Conditions table and validated across –40°C to +125°C, eliminating need for external level shifters in SN74LVC1G18DBVRG4-based interfaces.

How does the I_off feature protect SN74LVC1G18DBVRG4 during partial power-down sequences?

When V_CC is removed or ramped down, SN74LVC1G18DBVRG4's I_off circuitry places all inputs and outputs into high-impedance states, limiting leakage current to ±10 µA. This prevents damaging back-current flow from live system buses into the unpowered device - a critical safeguard during FPGA reconfiguration or hot-swap events in data center switches using SN74LVC1G18DBVRG4 for control signal routing.

What is the thermal resistance (R_θJA) of SN74LVC1G18DBVRG4 in its SOT-23-6 package?

SN74LVC1G18DBVRG4 in the SOT-23-6 (DBV) package has a junction-to-ambient thermal resistance (R_θJA) of 236.1°C/W, as measured per JEDEC JESD51 standards. This value assumes standard 2-layer PCB layout with 1-in² copper pour; actual thermal performance improves with enhanced copper area or thermal vias - critical for sustained ±24-mA output loading in industrial monitor backlight drivers using SN74LVC1G18DBVRG4.

Can unused inputs on SN74LVC1G18DBVRG4 be left floating?

No. All unused inputs on SN74LVC1G18DBVRG4 must be terminated to V_CC or GND to prevent undefined logic states, oscillation, and excessive ICC. The datasheet mandates this in Section 6.3 and Application Note SCBA004. For example, if S is unused in a fixed-Y0 configuration, tie S to GND; if A is unused, tie it to V_CC or GND depending on required default output state - a requirement strictly enforced in SN74LVC1G18DBVRG4 production validation.