Texas Instruments CD74HC154MG4

Overview

CD74HC154MG4 from Texas Instruments is a high-speed CMOS 4-to-16-line decoder/demultiplexer with dual enable inputs (E1, E2), operating from 2V to 6V, featuring 24-pin SOIC packaging, -55°C to +125°C temperature range, and propagation delay of 30 ns (typ) at 6V with 50 pF load. It performs address decoding in memory expansion and I/O selection in industrial control systems.

For engineers reviewing the CD74HC154MG4 datasheet, CD74HC154MG4 pinout, CD74HC154MG4 application, or CD74HC154MG4 equivalent, this page delivers verified functional identity, validated pin-level circuit roles, confirmed timing and voltage specifications, real-world use cases in embedded decoding, and two technically documented alternative parts for design flexibility.

Technical Context

The CD74HC154MG4 implements active-low 4-bit binary decoding logic: four address inputs (A0–A3) select one of sixteen outputs (Y0–Y15), while both enables must be low for valid decoding; a high on either E1 or E2 forces all outputs high. Its architecture supports cascading via enable chaining and demultiplexing by routing data through one enable input.

It uses standard HC CMOS process technology, delivering rail-to-rail output swing, high noise immunity (NIL/NIH = 30% of VCC at 5V), and balanced tPLH/tPHL transition times - critical for synchronous bus decoding where skew between address and enable paths must be minimized.

Key Specifications

Pinout & Package

CD74HC154MG4 is housed in a 24-pin SOIC (DW) package with 0.300-inch body width, gull-wing leads, and RoHS-compliant NiPdAu lead finish. Pin 1 is located in Quadrant Q1 per tape-and-reel orientation standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-to-16 decoder/demultiplexer applications.

Compared with SN74HC154N, CD74HC154MG4 enables automated SMT placement and improves thermal performance (θJA = 46°C/W vs. 67°C/W); compared with CD74HCT154M96, it supports 3.3V microcontroller interfaces natively and reduces quiescent current by ~20% at 5V operation.

Availability

CD74HC154MG4 is available at Aetrix Electronics and suitable for industrial control systems, avionics subsystems, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC154MG4 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 decades of heritage in high-reliability logic families including the CD74HC series.

The CD74HC154MG4 belongs to TI's High-Speed CMOS Logic portfolio, designed specifically for robust, low-power address decoding and signal routing in mission-critical industrial, aerospace, and defense applications.

FAQ

What is the function of the CD74HC154MG4?

The CD74HC154MG4 is a 4-to-16 line decoder/demultiplexer with two active-low enable inputs (E1 and E2). It accepts four binary address inputs (A0–A3) and drives exactly one of sixteen active-low outputs (Y0–Y15) when both enables are asserted low. When either E1 or E2 is high, all outputs go high. This behavior enables cascading and demultiplexing functions in digital systems. The CD74HC154MG4 is widely used for memory chip selection and I/O expansion.

Does the CD74HC154MG4 support 3.3V operation?

Yes, the CD74HC154MG4 fully supports 3.3V operation as part of its 2V to 6V supply range. At VCC = 3.3V, it maintains guaranteed VIH = 2.31V (70% of VCC) and VIL = 0.99V (30% of VCC), ensuring reliable interfacing with 3.3V microcontrollers and FPGAs. Its HC logic family guarantees rail-to-rail output swing and noise margins even at reduced supply voltages, making the CD74HC154MG4 suitable for mixed-voltage designs.

What is the maximum propagation delay of the CD74HC154MG4 at 5V?

At VCC = 5V and CL = 50 pF, the CD74HC154MG4 has a maximum propagation delay of 44 ns (tPLH/tPHL) over the full operating temperature range (-55°C to +125°C). This value is specified in the official Texas Instruments datasheet (SCHS152D) and reflects worst-case timing under industrial temperature extremes. The typical delay is 14 ns at 25°C, confirming consistent high-speed performance across voltage and temperature conditions for the CD74HC154MG4.

Can the CD74HC154MG4 be used as a demultiplexer?

Yes, the CD74HC154MG4 can function as a 1-to-16 demultiplexer by using one enable input (e.g., E1) as the data input and holding the other enable (E2) low, while applying address bits A0–A3 to select the destination output. In this configuration, a high on E1 propagates to the selected Yx output (active-low), and a low on E1 forces all outputs high. This demultiplexing capability is explicitly documented in the CD74HC154MG4 datasheet truth table and functional description.

Is the CD74HC154MG4 pin-compatible with the CD74HCT154M96?

Yes, the CD74HC154MG4 is pin-compatible with the CD74HCT154M96: both use the same 24-pin SOIC (DW) package, identical pin assignments for A0–A3, E1, E2, Y0–Y15, GND, and VCC, and share mechanical dimensions and tape-and-reel specifications. However, they differ electrically - the CD74HC154MG4 accepts 2V–6V supplies and has CMOS-input thresholds, while the CD74HCT154M96 requires 4.5V–5.5V and features TTL-compatible inputs. The CD74HC154MG4 cannot be substituted for CD74HCT154M96 in pure 5V TTL systems without verifying input voltage compatibility.