Texas Instruments CD74AC157M96

Overview

CD74AC157M96 from Texas Instruments is a quadruple 2-line to 1-line data selector/multiplexer in SOIC-16 package, operating from 1.5V to 5.5V, with ±24mA output drive, balanced propagation delay, and active-low strobe (G) enabling simultaneous channel disable. It routes four independent 2:1 data paths for bus switching in digital control systems.

For engineers reviewing the CD74AC157M96 datasheet, CD74AC157M96 pinout, CD74AC157M96 application, or CD74AC157M96 equivalent, key selection criteria include VCC range compatibility (1.5–5.5V), guaranteed 24mA drive at 4.5–5.5V, 7.7ns max tPHL at 5V/85°C, SOIC-16 thermal metrics (RθJA = 73°C/W), and true-output logic behavior under strobe control.

Technical Context

The CD74AC157M96 implements four independent 2:1 multiplexers sharing one address input (A/B) and one active-low strobe (G). When G is high, all Y outputs are forced low regardless of A/B or data inputs; when G is low, each Yx selects between corresponding Ax and Bx based on A/B state.

It uses silicon-gate CMOS technology with balanced push-pull outputs capable of sourcing/sinking equal current (±24mA), standard CMOS inputs requiring fast transitions (≤20 ns/V at 3.6–5.5V), and internal clamp diodes protecting against ESD (±2000V HBM).

Key Specifications

Pinout & Package

CD74AC157M96 is supplied in a 16-pin SOIC (D) package measuring 9.9mm × 6.0mm (body: 9.9mm × 3.91mm), with gull-wing leads, RoHS-compliant NIPDAU finish, and moisture sensitivity level 1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AC157DR and 74LVC157PW,118, CD74AC157M96 uniquely supports full 1.5–5.5V operation with guaranteed 24mA drive across that range, making it the sole option for mixed-voltage or extended-temperature industrial systems requiring single-part qualification.

Availability

CD74AC157M96 is available at Aetrix Electronics and suitable for industrial PLCs, automated test equipment, embedded microcontroller bus expansion, and legacy interface bridging requiring stable component supply across temperature extremes and long production lifecycles.

Supply support for CD74AC157M96 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 logic ICs.

CD74AC157M96 belongs to the CD74AC high-speed CMOS logic family, designed specifically for industrial and automotive applications demanding wide VCC range, robust ESD tolerance, and guaranteed performance across extreme temperatures.

FAQ

What is the maximum clock/data rate supported by CD74AC157M96?

The CD74AC157M96 does not operate on a clock; it is asynchronous. Its maximum usable data rate is determined by propagation delay: at VCC = 5V and TA = 85°C, tPHL is 7.7ns max, supporting reliable data switching up to ~100 MHz in well-terminated systems. The CD74AC157M96's 2.1ns min tPLH at 5V/25°C further confirms suitability for high-speed routing where setup/hold margins allow.

Does CD74AC157M96 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs on CD74AC157M96 must be terminated to either VCC or GND. Floating CMOS inputs cause excessive power consumption and potential oscillation. A 10kΩ resistor is recommended for pull-up/pull-down; direct connection is acceptable if the input is permanently inactive. This requirement applies to A/B, G, and any unused data inputs (1A–4B), as specified in the TI datasheet Section 7.3.2.

Can CD74AC157M96 drive a 50Ω transmission line directly?

No - CD74AC157M96 is not designed for 50Ω line driving. Its output structure targets logic-level interfacing, not RF or high-speed serial signaling. The datasheet specifies CL ≤ 50pF for full spec compliance; driving 50Ω loads risks exceeding VOL/VOH limits and violating absolute max ratings. For 50Ω applications, use a dedicated line driver or buffer after the CD74AC157M96.

Is CD74AC157M96 pin-compatible with CD74HC157M96?

Yes - CD74AC157M96 and CD74HC157M96 share identical SOIC-16 pinout, pin functions, and truth table. However, they differ electrically: CD74AC157M96 offers faster speed (7.7ns vs. 21ns max tPHL at 5V), wider VCC range (1.5–5.5V vs. 2–6V), and higher drive (±24mA vs. ±7.8mA). Substitution requires verifying timing and drive requirements.

What is the thermal resistance (RθJA) of CD74AC157M96 in its SOIC package?

The CD74AC157M96 in SOIC (D) package has RθJA = 73°C/W, as documented in Section 5.4 of the TI datasheet. This value assumes standard JEDEC 2-layer board conditions. Actual junction temperature rise depends on PCB copper area, airflow, and power dissipation - the CD74AC157M96's typical Cpd of 156pF enables precise dynamic power calculation for thermal modeling.