Texas Instruments 74LVC2G157DCTRE4

Overview

74LVC2G157DCTRE4 from Texas Instruments is a single 2-line to 1-line data selector multiplexer in an 8-pin SSOP 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 - used for signal routing in embedded PC and sensor interface applications.

For engineers reviewing the 74LVC2G157DCTRE4 datasheet, 74LVC2G157DCTRE4 pinout, 74LVC2G157DCTRE4 application, or 74LVC2G157DCTRE4 equivalent, key selection criteria include Ioff-enabled partial-power-down capability, 5.5 V-tolerant inputs for level translation, low ICC (10 µA max), and NanoFree™-compatible SSOP packaging for space-constrained designs.

Technical Context

The 74LVC2G157DCTRE4 implements a positive-logic 2:1 multiplexer with active-low common strobe (G) controlling data flow: when G = L, output Y reflects A or B based on A/B select; when G = H, Y = L and Y = H regardless of A/B. It features standard CMOS inputs with 5 pF typical input capacitance and balanced high-drive push-pull outputs.

Its Ioff circuitry ensures isolation during partial power-down, preventing back-drive current when VCC = 0 while inputs remain at up to 5.5 V. The device supports down-translation - e.g., 5-V sensor signals routed into a 3.3-V MCU system - without external level shifters.

Key Specifications

Pinout & Package

Package: SSOP (DCT), 8-pin, body size 2.95 mm × 2.80 mm, RoHS-compliant, NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G157DCKR, the 74LVC2G157DCTRE4 provides both true and inverted outputs in a robust SSOP package - essential for noise-immune sampling and legacy footprint compatibility. Against 74LVC2G157DCURG4, it trades slightly larger size for easier hand-soldering and broader distributor availability in tape-and-reel formats.

Availability

74LVC2G157DCTRE4 is available at Aetrix Electronics and suitable for embedded PC, field transmitter, and e-book applications requiring stable component supply, long-lifecycle assurance, and RoHS-compliant sourcing.

Supply support for 74LVC2G157DCTRE4 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 low-power, high-reliability interface ICs for industrial and consumer markets.

The SN74LVC2G157 product line delivers compact, voltage-flexible multiplexers optimized for sensor aggregation, signal routing, and mixed-voltage system integration in space- and power-constrained applications.

FAQ

What is the function of the G (strobe) pin on the 74LVC2G157DCTRE4?

The G pin is an active-low common strobe input that globally enables or disables the multiplexer. When G = H, both outputs are forced to fixed states (Y = L, Y = H), irrespective of A, B, or A/B. When G = L, the device operates normally - routing either A or B to Y based on A/B. This allows synchronous blanking of outputs during system initialization or fault conditions.

Can the 74LVC2G157DCTRE4 interface a 5-V sensor with a 1.8-V microcontroller?

Yes. The 74LVC2G157DCTRE4 accepts input voltages up to 5.5 V regardless of VCC level, enabling direct connection of 5-V sensor outputs to its A, B, or A/B pins while operating from a 1.8-V supply. Its outputs swing rail-to-rail (0 V to 1.8 V), making it compatible with 1.8-V MCU inputs without external level shifting.

Does the 74LVC2G157DCTRE4 support hot-swap or live insertion?

Yes. Its Ioff specification (±10 µA max) ensures outputs remain high-impedance and non-destructive when VCC = 0, even with input or output pins biased to 5.5 V. This protects downstream circuitry during board replacement or modular system upgrades - a requirement verified per JESD78 Class II latch-up testing.

What is the maximum capacitive load the 74LVC2G157DCTRE4 can drive while maintaining timing specs?

The 74LVC2G157DCTRE4 is characterized for loads ≤50 pF at VCC = 3.3 V (per Switching Characteristics test conditions). While it can drive up to 70 pF with acceptable performance degradation, exceeding 50 pF may increase propagation delay beyond the 6 ns max spec and induce ringing due to its ±24 mA drive strength - especially on longer traces without series termination.

How does the 74LVC2G157DCTRE4 differ from the SN74LVC1G157 in practical design use?

The 74LVC2G157DCTRE4 provides both true (Y) and inverted (Y) outputs in an 8-pin SSOP package, whereas the SN74LVC1G157 offers only Y in a 5-pin SC70 package. This makes the 74LVC2G157DCTRE4 suitable for applications requiring complementary signals (e.g., differential sampling, clock domain crossing), while the 1G variant saves board space where only one output polarity is needed.