Texas Instruments SN74LVC2G157YZAR

Overview

SN74LVC2G157YZAR from Texas Instruments is a single 2-line to 1-line data selector multiplexer in an 8-pin DSBGA (NanoFree™) package, supporting 1.65-V to 5.5-V V_CC, delivering true and complementary outputs (Y and Y), with 6 ns max propagation delay at 3.3 V and ±24-mA output drive. It enables signal routing in compact embedded sensor interfaces and low-power portable systems.

For engineers reviewing the SN74LVC2G157YZAR datasheet, SN74LVC2G157YZAR pinout, SN74LVC2G157YZAR application, or SN74LVC2G157YZAR equivalent, key selection criteria include I_off-enabled partial-power-down operation, 5.5-V-tolerant inputs for level translation, low ICC (10 µA max), and NanoFree™ package suitability for space-constrained PCB layouts.

Technical Context

The SN74LVC2G157YZAR implements a positive-logic 2:1 multiplexer with a common strobe (G) input controlling output enable: when G is high, both outputs are forced (Y = L, Y = H); when G is low, the A/B select line routes either A or B to Y/Y. Its standard CMOS inputs accept up to 5.5 V independent of V_CC, enabling down-translation from higher-voltage domains.

It features balanced high-drive CMOS push-pull outputs capable of ±24 mA at 3.3 V, with controlled ground bounce (V_OLP < 0.8 V) and undershoot (V_OHV > 2 V). The I_off circuitry disables outputs during power-down, preventing back-drive current and supporting live insertion in multi-rail systems.

Key Specifications

Pinout & Package

SN74LVC2G157YZAR uses an 8-pin DSBGA (Die Size Ball Grid Array) package measuring 1.91 mm × 0.91 mm, leveraging Texas Instruments' NanoFree™ technology where the silicon die serves as the package - eliminating mold compound and leadframe for minimal footprint and thermal resistance (R_θJB = 27.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G157DCURG4, SN74LVC2G157YZAR offers 45% smaller footprint and lower thermal resistance, while SN74LVC1G157DBVR sacrifices functional completeness (no Y) for cost and size reduction - making SN74LVC2G157YZAR optimal for miniaturized, high-integration designs requiring both outputs.

Availability

SN74LVC2G157YZAR is available at Aetrix Electronics and suitable for barcode scanners, field transmitters, and e-book display controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVC2G157YZAR 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 specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in power management and signal chain technologies.

The SN74LVC2G157YZAR belongs to TI's LVC logic family - designed for low-voltage, high-speed, mixed-signal interfacing in portable, industrial, and communications equipment where space, power, and reliability are critical.

FAQ

What is the operating voltage range for SN74LVC2G157YZAR?

The SN74LVC2G157YZAR operates from 1.65 V to 5.5 V on V_CC. Its inputs tolerate up to 5.5 V regardless of V_CC level, enabling robust level translation - for example, interfacing a 5-V sensor to a 1.8-V microcontroller. This range is fully specified across –40°C to +85°C ambient temperature.

Does SN74LVC2G157YZAR support partial power-down functionality?

Yes, SN74LVC2G157YZAR includes I_off circuitry that disables outputs when V_CC = 0, limiting leakage current to ±10 µA. This prevents damaging back-current flow during hot-insertion or multi-rail sequencing - a key requirement in server PSUs and modular field transmitters where subsystems power up/down independently.

What is the significance of the NanoFree™ package in SN74LVC2G157YZAR?

The NanoFree™ DSBGA package in SN74LVC2G157YZAR uses the silicon die itself as the package - eliminating traditional leadframe and mold compound. At 1.91 mm × 0.91 mm, it delivers the smallest footprint in the LVC2G157 family, with R_θJB = 27.8°C/W for improved thermal performance in thermally constrained spaces like wearable biometric modules.

Can SN74LVC2G157YZAR drive a 50-pF load while meeting timing specs?

Yes, SN74LVC2G157YZAR is characterized to drive up to 50 pF while maintaining its 6 ns max t_pd at 3.3 V. The datasheet confirms full specification compliance under 50-pF capacitive loading conditions - typical for routing to multiple CMOS inputs or short PCB traces in embedded PC and NAS controller designs.

How does the SN74LVC2G157YZAR handle unused inputs?

All unused inputs on SN74LVC2G157YZAR - including A, B, A/B, and G - must be terminated to either V_CC or GND to prevent floating states and undefined logic behavior. A 10-kΩ pull-up or pull-down resistor is recommended for configurable inputs; direct connection suffices for permanently fixed control lines in applications like fixed-function field transmitters.