Texas Instruments SN74LVC1G18DCKRE4

Overview

SN74LVC1G18DCKRE4 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), supports ±24-mA output drive at 3.3 V, achieves 3.4 ns max propagation delay at 3.3 V, and operates across –40°C to +125°C - used in Wi-Fi access points and baseband units for signal path selection.

For engineers reviewing the SN74LVC1G18DCKRE4 datasheet, SN74LVC1G18DCKRE4 pinout, SN74LVC1G18DCKRE4 application, or SN74LVC1G18DCKRE4 equivalent, key selection criteria include its I_off-enabled partial-power-down capability, over-voltage tolerant inputs up to 5.5 V, 3-state output behavior during deselection, and SC70-6 package compatibility with space-constrained PCB layouts.

Technical Context

This device implements a single-channel 1:2 noninverting demux with active-high select logic and true 3-state outputs. Its balanced CMOS output structure enables symmetrical sourcing/sinking (±24 mA at 3.3 V), while I_off circuitry disables all I/O pins during power-down to prevent back-drive current.

The SN74LVC1G18DCKRE4 features over-voltage tolerant inputs (up to 5.5 V independent of V_CC), supports voltage translation down to V_CC, and maintains specified timing (t_pd ≤ 4.7 ns at 3.3 V, –40°C to 125°C) and DC parameters (V_OH ≥ V_CC – 0.1 V, V_OL ≤ 0.4 V at 16 mA) across its full operating range.

Key Specifications

Pinout & Package

SN74LVC1G18DCKRE4 uses the SC70-6 (DCK) package: 2.00 mm × 1.10 mm body, 0.65 mm pitch, 6-pin surface-mount outline with gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G19DCKR, SN74LVC1G18DCKRE4 avoids firmware-level polarity inversion; compared with 74LVC1G18GW,125, it provides higher HBM ESD immunity essential for field-deployed infrastructure equipment.

Availability

SN74LVC1G18DCKRE4 is available at Aetrix Electronics and suitable for Wi-Fi access points, baseband units, and industrial monitors requiring stable component supply, long-term lifecycle assurance, and automotive-qualified traceability.

Supply support for SN74LVC1G18DCKRE4 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 logic solutions, with leadership in high-reliability industrial and communications ICs.

SN74LVC1G18DCKRE4 belongs to the LVC low-voltage CMOS logic family, engineered for interoperability across mixed-voltage systems and robust operation in thermally demanding infrastructure applications.

FAQ

What is the maximum allowable input voltage for SN74LVC1G18DCKRE4 when V_CC = 1.8 V?

The SN74LVC1G18DCKRE4 accepts input voltages up to 5.5 V regardless of V_CC level, as confirmed in the Recommended Operating Conditions table. At V_CC = 1.8 V, this over-voltage tolerance enables direct connection to 3.3-V or 5-V control signals without external level-shifting circuitry - a key advantage in mixed-supply systems. This specification is validated across the full –40°C to +125°C temperature range.

Does SN74LVC1G18DCKRE4 support hot-swap or live-insertion applications?

Yes, SN74LVC1G18DCKRE4 supports live insertion via its I_off feature, which disables all inputs and outputs when V_CC = 0 V, limiting I/O leakage to ±10 µA. This prevents damaging back-current flow into powered-down sections of a backplane or modular system. The feature is explicitly characterized in the Electrical Characteristics table and validated per JESD78 Class II latch-up standards.

What is the worst-case propagation delay for SN74LVC1G18DCKRE4 at 125°C and 3.3 V?

At V_CC = 3.3 V and T_A = –40°C to +125°C, the maximum propagation delay (t_pd) for SN74LVC1G18DCKRE4 is 4.7 ns, as specified in Section 6.7 (Switching Characteristics, –40 to 125°C) of the datasheet. This value applies to the A→Y path under CL = 30 pF or 50 pF loading and represents the guaranteed upper limit for timing closure in high-temperature industrial deployments.

Can unused inputs on SN74LVC1G18DCKRE4 be left floating?

No, unused inputs on SN74LVC1G18DCKRE4 must be terminated to either V_CC or GND to ensure predictable logic states and prevent increased ICC or oscillation. The datasheet mandates this in Section 6.3 (Recommended Operating Conditions) and Section 11 (Layout), citing TI application report SCBA004. A 10-kΩ pull-up or pull-down resistor is recommended for unused pins to balance leakage control and transition speed.

What decoupling capacitance is recommended for SN74LVC1G18DCKRE4?

Texas Instruments recommends a 0.1-µF ceramic decoupling capacitor placed physically adjacent to the V_CC and GND pins of SN74LVC1G18DCKRE4, as specified in Section 10 (Power Supply Recommendations) and Figure 8 of the datasheet. This minimizes high-frequency supply noise and ensures stable switching performance - especially critical given the device's 3.4-ns propagation delay and ±24-mA drive capability.