Texas Instruments SN74LVC2G157DCTR

Overview

SN74LVC2G157DCTR from Texas Instruments is a single 2-line to 1-line data selector multiplexer in an 8-pin SSOP package, supporting 1.65–5.5 V operation, delivering 6 ns max propagation delay at 3.3 V, ±24 mA output drive, and Ioff-enabled live insertion for partial-power-down systems. It routes true/complementary outputs (Y/Y) based on A/B select and G strobe control, used in sensor multiplexing on embedded PC and HVAC controller boards.

For engineers reviewing the SN74LVC2G157DCTR datasheet, SN74LVC2G157DCTR pinout, SN74LVC2G157DCTR application, or SN74LVC2G157DCTR equivalent, key selection criteria include VCC range compatibility (1.65–5.5 V), dual-output logic behavior (Y/Y), Ioff back-drive protection, and NanoFree™-compatible SSOP footprint for space-constrained industrial interfaces.

Technical Context

The SN74LVC2G157DCTR implements a positive-logic 2:1 multiplexer with independent true (Y) and inverted (Y) outputs, controlled by a common strobe (G) and select (A/B) inputs. Its Standard CMOS inputs accept up to 5.5 V regardless of VCC, enabling level translation from higher-voltage sensors into lower-VCC logic domains.

It features balanced high-drive CMOS push-pull outputs capable of sourcing/sinking ±24 mA at 3.3 V, with Ioff circuitry that disables outputs during power-down to prevent current backflow. Latch-up performance exceeds 100 mA per JESD 78 Class II, and ESD robustness includes 2000-V HBM and 1000-V CDM ratings.

Key Specifications

Pinout & Package

SN74LVC2G157DCTR uses an 8-pin SSOP (DCT) package measuring 2.95 mm × 2.80 mm, compatible with standard surface-mount reflow profiles and offering improved thermal resistance (RθJA = 192°C/W) versus smaller-footprint variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G157DCTR, SN74LVC1G157DCKR saves board area but sacrifices design flexibility via missing Y output, while 74AUP1G157GW,125 trades off voltage compatibility for lower static current - neither matches the full feature set of true+complementary outputs, 5.5-V input tolerance, and Ioff in an industry-standard SSOP package.

Availability

SN74LVC2G157DCTR is available at Aetrix Electronics and suitable for embedded PC, HVAC controller, and field transmitter applications requiring stable component supply, long-lifecycle assurance, and RoHS-compliant manufacturing.

Supply support for SN74LVC2G157DCTR 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 50 years of innovation in high-reliability interface and signal-path components.

The SN74LVC2G157DCTR belongs to TI's LVC logic family, designed specifically for low-voltage, mixed-signal industrial and computing applications demanding robust level translation, low power, and seamless integration with microcontrollers and sensors.

FAQ

What is the maximum operating voltage for SN74LVC2G157DCTR inputs?

The SN74LVC2G157DCTR inputs tolerate up to 5.5 V regardless of VCC level, enabling direct connection to 5-V sensors or legacy logic while operating at 1.65–5.5 V supply. This down-translation capability eliminates external level shifters in mixed-voltage systems and is confirmed in the Recommended Operating Conditions table of the official datasheet.

Does SN74LVC2G157DCTR provide both true and inverted outputs?

Yes, SN74LVC2G157DCTR provides simultaneous true (Y) and complementary (Y) outputs. When G = LOW and A/B selects an input, Y reflects the selected bit while Y delivers its logical inverse - verified in the Logic Diagram, Function Table, and Pin Functions sections of the SCES207N datasheet.

Can SN74LVC2G157DCTR be used during partial power-down?

Yes, SN74LVC2G157DCTR supports partial power-down via Ioff circuitry, limiting off-state current to ±10 µA maximum. This prevents damaging back-current when VCC = 0 but inputs remain active - a key requirement for hot-swap and low-power sleep modes, explicitly documented in Features and Detailed Description sections.

What is the propagation delay of SN74LVC2G157DCTR at 3.3 V?

The maximum propagation delay (tpd) of SN74LVC2G157DCTR is 6 ns at VCC = 3.3 V, measured from any input (A, B, or A/B) to either output (Y or Y). This value is specified in the Switching Characteristics table under "VCC = 3.3 V ± 0.3 V" and applies across –40°C to 85°C operating temperature.

Which package type does SN74LVC2G157DCTR use?

SN74LVC2G157DCTR uses the 8-pin SSOP (DCT) package with nominal dimensions 2.95 mm × 2.80 mm. This is confirmed in the Device Information table and Mechanical, Packaging, and Orderable Information section of the datasheet, distinguishing it from DCU (VSSOP) and YZP (DSBGA) variants.