Texas Instruments SN74LV157AD

Overview

SN74LV157AD from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer operating from 2 V to 5.5 V, with 7.5 ns max propagation delay at 5 V, 50 µA max ICC at 5.5 V, and latch-up immunity exceeding 100 mA per JESD78 Class II - used for signal routing in LED display column drivers and I/O expander data path selection.

For engineers reviewing the SN74LV157AD datasheet, SN74LV157AD pinout, SN74LV157AD application, or SN74LV157AD equivalent, key selection criteria include VCC range compatibility (2–5.5 V), output drive capability (±25 mA), ground bounce performance (<0.8 V), and SOIC-16 package thermal resistance (73 °C/W).

Technical Context

The SN74LV157AD implements four independent 2:1 multiplexers with a common active-low strobe (G) and shared address select (A/B) input, enabling simultaneous 4-bit word selection from dual sources. Each channel outputs true (non-inverted) data, with no internal inversion between inputs and Y outputs.

It supports mixed-voltage interfacing: inputs tolerate up to 5.5 V regardless of VCC, allowing connection to higher-voltage logic while powered from 2.5 V or 3.3 V supplies. Switching performance is characterized across three VCC levels (2.5 V, 3.3 V, 5 V) with load capacitances of 15 pF and 50 pF.

Key Specifications

Pinout & Package

SN74LV157AD is supplied in a 16-pin SOIC (D) package measuring 10.3 mm × 7.5 mm with 1.27 mm lead pitch and 2.00 mm max height. Thermal resistance is 73 °C/W (junction-to-ambient).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LV157ADR, SN74LV157AD offers identical functionality in tube packaging for flexibility in small-batch builds; versus 74LVC157PW, SN74LV157AD provides broader voltage range and 5.5 V input tolerance at the cost of slightly higher propagation delay in 3.3 V operation.

Availability

SN74LV157AD is available at Aetrix Electronics and suitable for LED display column drivers, industrial I/O expanders, and network switch control plane designs requiring stable component supply across extended product lifecycles.

Supply support for SN74LV157AD 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 industrial, automotive, and communications markets.

The SN74LV157A family delivers low-voltage, high-noise-immunity multiplexing for mixed-signal systems where interoperability across 2.5 V, 3.3 V, and 5 V logic domains is essential.

FAQ

What is the maximum supply voltage rating for SN74LV157AD?

The absolute maximum VCC rating for SN74LV157AD is 7 V, but the recommended operating range is 2 V to 5.5 V. Operation above 5.5 V voids guaranteed functionality and may cause permanent damage. All electrical characteristics - including propagation delay, output drive, and noise margins - are specified and validated only within the 2–5.5 V range per the official TI datasheet revision March 2023.

Does SN74LV157AD support 5 V logic inputs when powered from 3.3 V?

Yes, SN74LV157AD inputs tolerate up to 5.5 V regardless of VCC level. When powered from 3.3 V, it reliably accepts 5 V TTL/CMOS signals on all input pins (A/B, 1A–4B, G), eliminating the need for external level-shifting circuitry in mixed-voltage systems such as industrial I/O expanders interfacing with legacy 5 V sensors.

What is the function of the G pin on SN74LV157AD?

The G pin is an active-low output strobe that globally enables or disables all four Y outputs. When G = L, outputs reflect the selected A/B inputs; when G = H, all Y outputs enter high-impedance state. This feature allows bus sharing and glitch-free state transitions - critical in motor driver interface logic where synchronized gating prevents unintended actuator movement.

Is SN74LV157AD pin-compatible with older 74LS157 or 74HC157 devices?

No, SN74LV157AD is not pin-compatible with 74LS157 or 74HC157. While all are quad 2:1 multiplexers, SN74LV157AD uses a distinct pinout: G (strobe) is on pin 15, whereas 74LS157 places the strobe on pin 5 and lacks dedicated A/B select (uses separate S0/S1). Physical substitution would require PCB redesign and logic re-implementation.

What thermal performance can be expected from SN74LV157AD in SOIC packaging?

SN74LV157AD in SOIC (D) package has a junction-to-ambient thermal resistance (RθJA) of 73 °C/W under standard JEDEC test conditions. At 25 °C ambient and 5.5 V supply with typical 12.1 pF power dissipation capacitance, steady-state junction temperature rise remains below 30 °C at 10 MHz toggle rate - well within safe operating limits for continuous operation in enclosed industrial enclosures.