Texas Instruments SN74LVC157ADRG4

Overview

SN74LVC157ADRG4 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in 16-pin SOIC (D) package, operating from 1.65V to 3.6V supply, supporting –40°C to 125°C temperature range, with 5.2ns max propagation delay at 3.3V and 5.5V-tolerant inputs. It enables signal routing in mixed-voltage digital systems such as FPGA I/O expansion and microcontroller peripheral selection.

For engineers reviewing the SN74LVC157ADRG4 datasheet, SN74LVC157ADRG4 pinout, SN74LVC157ADRG4 application, or SN74LVC157ADRG4 equivalent, key selection criteria include its 16-pin SOIC thermal profile (R_θJA = 118.1°C/W), active-low output strobe (G), address-select control (A/B), and compatibility with both 3.3V and 5V logic families without level-shifting circuitry.

Technical Context

The SN74LVC157ADRG4 implements four independent 2:1 multiplexers sharing one common strobe (G) and one address select (A/B) input. When G is high, all outputs (1Y–4Y) are forced low regardless of A/B or data inputs; when G is low, each Y output reflects either the corresponding A or B input based on A/B state.

Its CMOS design supports 5.5V-tolerant inputs across the full 1.65V–3.6V V_CC range, enabling direct interfacing with legacy 5V logic while powered from modern low-voltage rails. Output drive strength scales with V_CC, delivering ±24mA at 3.0V and ±4mA at 1.65V per channel.

Key Specifications

Pinout & Package

SN74LVC157ADRG4 uses a 16-pin SOIC (D) package measuring 9.90 mm × 6.00 mm (body: 9.90 mm × 3.90 mm), with gull-wing leads and RoHS-compliant NiPdAu plating. Thermal resistance R_θJA = 118.1°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC157ADR and 74LVC157AD, the SN74LVC157ADRG4 offers identical multiplexing performance and SOIC-16 compatibility but guarantees consistent NiPdAu lead finish and full TI production traceability-critical for automotive and medical OEM qualification.

Availability

SN74LVC157ADRG4 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and medical instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SN74LVC157ADRG4 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 reliable, high-performance ICs.

The SN74LVC157ADRG4 belongs to TI's LVC logic family, designed for low-voltage, high-speed digital interfacing in space-constrained and thermally demanding applications where 5V-tolerance and wide V_CC range are essential.

FAQ

What is the maximum clock/data rate supported by the SN74LVC157ADRG4?

The SN74LVC157ADRG4 has a maximum propagation delay of 5.2ns at 3.3V, supporting data switching up to approximately 100MHz in non-critical timing paths. For synchronous applications, designers should verify setup/hold margins using the 3.3V t_pd = 5.2ns and t_sk(o) = 1.5ns values from the datasheet. The SN74LVC157ADRG4 does not include internal clock circuitry-it functions as combinational logic only.

Can the SN74LVC157ADRG4 interface directly with 5V microcontrollers?

Yes, the SN74LVC157ADRG4 accepts input voltages up to 5.5V regardless of V_CC level (1.65V–3.6V), allowing direct connection to 5V GPIOs without external level shifters. Its outputs swing rail-to-rail (0V to V_CC), so interfacing with 5V receivers requires pull-up resistors or compatible 5V-tolerant inputs. The SN74LVC157ADRG4 is commonly used in mixed-voltage systems for this exact purpose.

Does the SN74LVC157ADRG4 require external pull-up or pull-down resistors on unused inputs?

Yes, all unused inputs of the SN74LVC157ADRG4-including A/B, G, and any unconnected 1A/1B through 4A/4B-must be terminated to V_CC or GND. Floating CMOS inputs cause increased ICC, unpredictable output states, and potential device malfunction. TI recommends tying unused inputs directly to V_CC or GND with short PCB traces; the SN74LVC157ADRG4 does not include internal termination resistors.

What is the thermal performance of the SN74LVC157ADRG4 in its SOIC package?

The SN74LVC157ADRG4 in SOIC (D) package has a junction-to-ambient thermal resistance (R_θJA) of 118.1°C/W. At maximum rated power dissipation (500mW below 70°C ambient), junction temperature rise is ~59°C-well within safe limits for continuous operation at 125°C ambient when mounted on standard FR-4 with 1 oz copper. No heatsink is required for typical digital logic loads.

How does the strobe (G) pin affect output behavior in the SN74LVC157ADRG4?

The G pin on the SN74LVC157ADRG4 is an active-low output enable. When G = HIGH, all four outputs (1Y–4Y) are forced LOW independently of A/B state or input values. When G = LOW, outputs reflect the selected inputs (A or B per channel) as determined by A/B. This allows synchronous bus isolation-e.g., disabling all outputs during reset or power-down sequences. The SN74LVC157ADRG4 does not support three-state outputs.