Texas Instruments SN74LVC2G157YZPR

Overview

SN74LVC2G157YZPR from Texas Instruments is a single 2-line to 1-line data selector multiplexer in an 8-pin DSBGA package, supporting 1.65 V to 5.5 V supply operation, delivering true and complementary outputs (Y and Y), with 6 ns max propagation delay at 3.3 V and ±24 mA output drive capability - used for signal routing in compact sensor interface and embedded control systems.

For engineers reviewing the SN74LVC2G157YZPR datasheet, SN74LVC2G157YZPR pinout, SN74LVC2G157YZPR application, or SN74LVC2G157YZPR equivalent, key selection criteria include Ioff-enabled partial-power-down support, 5.5 V-tolerant inputs for level translation, low ICC (10 µA max), NanoFree™ die-as-package construction, and verified operation across –40°C to 85°C industrial temperature range.

Technical Context

The SN74LVC2G157YZPR implements a positive-logic 2:1 multiplexer with active-low common strobe (G) controlling data routing: when G is high, both outputs are forced (Y = L, Y = H); when G is low, A/B selects between data inputs A and B to drive Y (true) and Y (complementary). Its standard CMOS inputs accept up to 5.5 V regardless of VCC, 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 Ioff circuitry that disables outputs during power-down to prevent back-drive current. The device meets JESD 78 Class II latch-up (>100 mA) and exceeds JESD 22 ESD ratings (2000-V HBM, 1000-V CDM).

Key Specifications

Pinout & Package

SN74LVC2G157YZPR uses an 8-pin DSBGA (Die Size Ball Grid Array) package measuring 1.91 mm × 0.91 mm with bottom-side ball terminations - a NanoFree™ implementation where the silicon die serves as the mechanical package, optimized for ultra-compact PCB layouts and thermal performance (RθJB = 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 SN74LVC2G157YZPR, SN74LVC1G157DCKR saves board area but sacrifices inverted output and Ioff protection, while NC7SZ157P6X offers faster timing but lacks power-down safety and true/complementary pair delivery - making SN74LVC2G157YZPR uniquely suited for compact, mixed-voltage, and power-gated embedded sensor hubs.

Availability

SN74LVC2G157YZPR is available at Aetrix Electronics and suitable for barcode scanner interfaces, embedded PC sensor hubs, fingerprint biometric modules, HVAC field transmitters, and network-attached storage (NAS) controller boards requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.

Supply support for SN74LVC2G157YZPR 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, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LVC2G157YZPR belongs to TI's LVC logic family - designed specifically for low-voltage, high-speed, mixed-signal interfacing in space- and power-constrained embedded systems, with emphasis on voltage translation, Ioff safety, and ultra-small packaging.

FAQ

What is the function of the G (strobe) pin on the SN74LVC2G157YZPR?

The G pin on the SN74LVC2G157YZPR is an active-high common strobe input. When G is high, both outputs are forced to fixed states: Y = low and Y = high, regardless of A/B or data inputs. When G is low, the device operates as a normal 2:1 multiplexer, routing either A or B to Y and Y based on the A/B selector. This enables precise timing control and output blanking in synchronous systems.

Does the SN74LVC2G157YZPR support level translation between different supply voltages?

Yes, the SN74LVC2G157YZPR supports down-translation: its inputs tolerate up to 5.5 V regardless of VCC, allowing 5 V sensor signals to be safely routed to a 3.3 V or 1.8 V MCU domain. The outputs swing rail-to-rail between GND and the applied VCC, so output levels match the host supply - making SN74LVC2G157YZPR ideal for mixed-voltage board-level interfacing without external translators.

What is the significance of Ioff in the SN74LVC2G157YZPR, and how does it affect system design?

Ioff in the SN74LVC2G157YZPR disables all outputs and blocks current flow when VCC = 0 V, preventing damaging back-drive current from live signal lines into a powered-down section of the system. This enables safe hot-plug operation, partial power-down sequencing, and robust behavior in modular or multi-rail designs - a critical feature confirmed in the datasheet for SN74LVC2G157YZPR and essential for industrial and embedded PC applications.

Can unused inputs on the SN74LVC2G157YZPR be left floating?

No, unused inputs on the SN74LVC2G157YZPR must be terminated to either VCC or GND using a pull-up or pull-down resistor (typically 10 kΩ), as stated in Section 9.2.1.2 of the official datasheet. Floating CMOS inputs can cause oscillation, excessive current draw, and unpredictable output states - especially problematic in the SN74LVC2G157YZPR due to its high-speed characteristics and sensitivity to slow edge rates.

What is the maximum capacitive load the SN74LVC2G157YZPR can drive while maintaining specified timing?

The SN74LVC2G157YZPR is characterized to drive up to 50 pF while meeting all switching specifications (e.g., 6 ns max tpd at 3.3 V). While loads up to 70 pF are permissible per TI application guidance, exceeding 50 pF may increase propagation delay and degrade edge integrity - particularly relevant for SN74LVC2G157YZPR's use in high-density DSBGA layouts where trace capacitance must be carefully managed.