Texas Instruments CD74AC151M96G4

Overview

CD74AC151M96G4 from Texas Instruments is a high-speed CMOS 8-line to 1-line data selector/multiplexer with balanced ±24mA output drive, 1.5V–5.5V supply operation, and dual complementary outputs (Y and inverted W). It performs Boolean function generation, parallel-to-serial conversion, and data source selection in digital control logic, address decoding, and signal routing applications.

For engineers reviewing the CD74AC151M96G4 datasheet, CD74AC151M96G4 pinout, CD74AC151M96G4 application, or CD74AC151M96G4 equivalent, key selection criteria include VCC range compatibility (1.5–5.5V), propagation delay at 5V (3.1–13.5ns), dual-output capability (Y/W), strobe-controlled enable (G), and SOIC-16 package thermal performance (RθJA = 119.9°C/W).

Technical Context

The CD74AC151M96G4 implements asynchronous 3-bit binary address decoding (A/B/C) to select one of eight data inputs (D0–D7) onto the Y output, while simultaneously providing its logical inverse on W. The active-low strobe (G) overrides all selections to force Y = low and W = high.

It uses SCR-latchup-resistant CMOS process technology with standard CMOS inputs and balanced push-pull outputs capable of driving 15 F-type loads. Input transition rate requirements (20–50 ns/V) and strict unused-input termination rules (tie to VCC or GND) are enforced to prevent oscillation and excessive power draw.

Key Specifications

Pinout & Package

CD74AC151M96G4 is supplied in a 16-pin SOIC (D) package measuring 9.90mm × 6.00mm (body: 9.90mm × 3.90mm), with gull-wing leads and standard JEDEC MS-012 outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8:1 multiplexer applications.

Compared with SN74AC151N and CD74HC151E, CD74AC151M96G4 offers superior 1.5V compatibility, higher output drive for fanout-critical designs, and SOIC packaging optimized for automated SMT assembly and thermal management in compact industrial modules.

Availability

CD74AC151M96G4 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive sensor multiplexing, digital logic function generation, and legacy system bus interface requiring stable component supply across extended temperature ranges.

Supply support for CD74AC151M96G4 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 broad industrial, automotive, and communications portfolio coverage.

The CD74AC151M96G4 belongs to TI's advanced CMOS logic family designed for high-speed, low-power data routing and combinatorial logic synthesis in harsh-environment control systems.

FAQ

What is the maximum operating frequency supported by CD74AC151M96G4?

The CD74AC151M96G4 does not specify a maximum clock frequency because it is an asynchronous combinational device. Its usable switching rate is determined by propagation delay: at VCC = 5V, tPHL/tPLH ranges from 3.1ns to 13.5ns, supporting data selection rates up to ~70 MHz in ideal conditions. Real-world limits depend on input transition rates, load capacitance (≤50pF recommended), and PCB layout integrity. The CD74AC151M96G4 must meet input transition rate specs (20 ns/V at 5V) to avoid oscillation.

Does CD74AC151M96G4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of CD74AC151M96G4 must be actively terminated to either VCC or GND to prevent floating nodes, which cause increased power consumption, logic instability, and potential device damage. TI explicitly mandates this in Section 4.3 of the datasheet. A 10kΩ resistor is recommended for unused address (A/B/C) or data (D0–D7) pins; direct connection is acceptable if permanently inactive. Leaving inputs unconnected violates the CD74AC151M96G4's recommended operating conditions.

Can CD74AC151M96G4 operate at 1.8V supply voltage?

Yes - CD74AC151M96G4 is fully specified for operation from 1.5V to 5.5V, including 1.8V. At VCC = 1.8V, input thresholds scale accordingly (VIH ≈ 1.44V, VIL ≈ 0.36V), and propagation delay increases to 152–245ns (per Section 4.6). Output drive remains functional though reduced versus 5V operation. This makes CD74AC151M96G4 compatible with 1.8V microcontrollers and low-power sensor interfaces without level translation.

What is the purpose of the W output on CD74AC151M96G4, and how is it used?

The W output on CD74AC151M96G4 is the logical inverse of the Y output - when Y = HIGH, W = LOW, and vice versa. It eliminates the need for an external inverter in applications requiring both true and complemented data, such as differential bus drivers, set/reset latches, or XOR-based parity generation. W is active simultaneously with Y and shares identical timing characteristics and drive strength (±24mA), making CD74AC151M96G4 a dual-output resource-efficient solution.

Is CD74AC151M96G4 pin-compatible with older CD74HC151 variants?

No - CD74AC151M96G4 is not pin-compatible with CD74HC151 variants despite identical pin numbering and function mapping. While both use 16-pin SOIC packages and share the same pinout (D0–D7, Y, W, G, A/B/C, VCC, GND), the AC and HC families differ in drive strength, noise immunity, and voltage thresholds. Substituting CD74AC151M96G4 for HC-series parts may cause timing violations or excessive current draw due to higher AC output drive (±24mA vs. ±5.2mA) and tighter input thresholds. Always verify interface compatibility before replacement.