Texas Instruments 74LVC2G157DCUTG4

Overview

74LVC2G157DCUTG4 from Texas Instruments is a single 2-line to 1-line data selector multiplexer with true and complementary outputs (Y and Y), designed for 1.65-V to 5.5-V V_CC operation, supporting 5-V I/O tolerance, 6-ns max propagation delay at 3.3 V, ±24-mA output drive, and I_off partial-power-down capability - used in sensor signal routing on embedded PC and HVAC control boards.

For engineers reviewing the 74LVC2G157DCUTG4 datasheet, 74LVC2G157DCUTG4 pinout, 74LVC2G157DCUTG4 application, or 74LVC2G157DCUTG4 equivalent, key selection criteria include V_CC voltage range compatibility (1.65–5.5 V), dual-output logic state integrity, I_off-enabled live insertion support, and NanoFree™ VSSOP package thermal performance (R_θJA = 289.9°C/W).

Technical Context

This device implements a positive-logic 2:1 multiplexer with active-low common strobe (G) controlling data routing: when G = LOW, output Y reflects A or B based on A/B select input, while Y provides the complement; when G = HIGH, Y = LOW and Y = HIGH regardless of A/B or data inputs. It uses standard CMOS inputs and balanced high-drive push-pull outputs.

Its I_off circuitry disables outputs during power-down to prevent back-drive current, enabling safe hot-plug operation. Input voltage tolerance up to 5.5 V allows down-translation from higher-voltage sources (e.g., 5-V sensors) into lower V_CC domains (e.g., 1.8-V or 3.3-V microcontrollers), verified across –40°C to 85°C operating temperature.

Key Specifications

Pinout & Package

74LVC2G157DCUTG4 is packaged in an 8-pin VSSOP (DCU) measuring 2.30 mm × 2.00 mm, optimized for space-constrained PCB layouts and offering improved thermal resistance over SSOP (R_θJA = 289.9°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 2:1 multiplexer applications.

Compared with SN74LVC1G157DBVR, 74LVC2G157DCUTG4 delivers dual-output logic and certified I_off protection essential for fault-tolerant designs; versus 74LVC2G157GM,115, it offers superior thermal dissipation in constrained VSSOP layouts despite identical functionality.

Availability

74LVC2G157DCUTG4 is available at Aetrix Electronics and suitable for embedded PC, HVAC control, and field transmitter applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for 74LVC2G157DCUTG4 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 over 50 years of leadership in high-reliability interface and signal-path ICs.

The SN74LVC2G157 belongs to TI's LVC low-voltage CMOS logic family, engineered for voltage-flexible, low-power, and robust signal routing in space- and power-constrained industrial and computing systems.

FAQ

What is the maximum input voltage rating for 74LVC2G157DCUTG4?

The 74LVC2G157DCUTG4 supports input voltages up to 5.5 V regardless of V_CC level - enabling direct interfacing with 5-V sensors or controllers even when powered from 1.8 V or 2.5 V. This is confirmed in the Absolute Maximum Ratings table (VI = –0.5 V to 6.5 V) and Recommended Operating Conditions (VI = 0 to 5.5 V), and applies to all inputs including A, B, A/B, and G.

Does 74LVC2G157DCUTG4 provide both true and inverted outputs?

Yes, the 74LVC2G157DCUTG4 provides simultaneous true (Y) and complementary (Y) outputs. When the strobe G is LOW and A/B selects A or B, Y reflects the chosen input while Y delivers its logical inverse. This dual-output capability is explicitly defined in the Functional Description, Logic Diagram, and Pin Functions table - and eliminates the need for external inverters in enable/flag or differential signaling paths.

Can 74LVC2G157DCUTG4 be used in partial-power-down systems?

Yes, the 74LVC2G157DCUTG4 incorporates I_off circuitry that disables outputs when V_CC = 0 V, limiting leakage current to ±10 µA and preventing damaging back-current from live inputs. This feature is fully characterized per JESD78 Class II latch-up testing and is validated in partial-power-down applications such as hot-pluggable modules and multi-rail power sequencing - as documented in Section 8.1 and Table 6.5.

What is the propagation delay of 74LVC2G157DCUTG4 at 3.3 V?

The maximum propagation delay (t_pd) of the 74LVC2G157DCUTG4 is 6 ns at V_CC = 3.3 V ± 0.3 V, measured from any input (A, B, A/B, or G) to either output (Y or Y). This value is specified in the Switching Characteristics table (Section 6.6) under recommended operating conditions and is guaranteed across the full –40°C to +85°C temperature range.

Which package type does 74LVC2G157DCUTG4 use?

The 74LVC2G157DCUTG4 uses the 8-pin VSSOP (Very Small Outline Package) with body size 2.30 mm × 2.00 mm, identified by the DCU suffix and marked "C57R" on the top surface. This NanoFree™-compatible package is distinct from SSOP (DCT) and DSBGA (YZP) variants - and is confirmed in TI's Orderable Addendum and Mechanical Drawings (SLYS222C).