Texas Instruments CD74HC154M

Overview

CD74HC154M 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 supply, featuring 24-pin SOIC package, -55°C to +125°C temperature range, and propagation delay of 30 ns (typ) at 6V with 50 pF load. It enables address decoding in industrial control logic and memory select circuits.

For engineers reviewing the CD74HC154M datasheet, CD74HC154M pinout, CD74HC154M application, or CD74HC154M equivalent, this page delivers verified functional identity, validated SOIC-24 pin mapping, confirmed HC-series voltage and timing specs, and two technically documented alternative parts for system-level design continuity.

Technical Context

The CD74HC154M implements active-low 4-bit binary decoding: inputs A0–A3 select one of sixteen Y0–Y15 outputs, while both E1 and E2 must be low for normal operation-either high forces all outputs high. Its architecture supports cascading via enable chaining and demultiplexing by routing data through one enable input.

It uses standard CMOS logic with rail-to-rail output swing, exhibits balanced tPLH/tPHL propagation delays (≤45 ns max over full temperature range), and maintains consistent transition times (≤19 ns typ at 4.5V). Input leakage remains ≤±1 µA across -55°C to +125°C, supporting robust operation in harsh environments.

Key Specifications

Pinout & Package

CD74HC154M is housed in a 24-pin SOIC (DW) package with 0.300-inch body width, gull-wing leads, and RoHS-compliant NiPdAu lead finish. Thermal resistance θJA is 46°C/W, supporting reliable operation up to 150°C junction temperature.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC154M, SN74HC154DR offers identical performance with active manufacturing status and enhanced traceability, while MC74HC154ADR2G provides a qualified second source with minor timing and power trade-offs acceptable in non-real-time systems.

Availability

CD74HC154M is available at Aetrix Electronics and suitable for industrial PLCs, memory subsystems, automated test equipment, and aerospace avionics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for CD74HC154M 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 ICs, with decades of heritage in high-reliability logic families including the 74HC series.

The CD74HC154M belongs to TI's industry-standard 74HC logic family, designed specifically for low-power, high-noise-immunity digital control in industrial, automotive, and defense applications where wide temperature operation and predictable timing are critical.

FAQ

What is the exact function of the CD74HC154M?

The CD74HC154M is a 4-to-16 line decoder/demultiplexer with two active-low enable inputs (E1 and E2). When both enables are low, it decodes the 4-bit binary input (A0–A3) to assert exactly one of sixteen active-low outputs (Y0–Y15). If either E1 or E2 is high, all outputs go high. This behavior is confirmed in the truth table and functional diagram of the official TI datasheet SCHS152D.

Does the CD74HC154M support 3.3V operation?

Yes, the CD74HC154M supports 3.3V operation as part of its specified 2V to 6V supply range. At VCC = 3.3V, it maintains valid VIH (≥2.1V) and VIL (≤1.1V) thresholds, delivers VOH ≥3.2V and VOL ≤0.1V under 25 mA load, and achieves typical propagation delay of ~40 ns with 50 pF load - all verified in TI's DC and switching specifications tables.

Is the CD74HC154M pin-compatible with the CD74HCT154M?

No - although both share the same 24-pin SOIC package and pinout, the CD74HC154M (HC logic) and CD74HCT154M (HCT logic) differ in input threshold compatibility: HC accepts 2V–6V supplies and has CMOS-compatible inputs, while HCT requires 4.5V–5.5V and accepts TTL-level inputs (VIH ≥2V, VIL ≤0.8V). Interchangeability depends on system voltage and driver type, not pin mapping alone.

What is the maximum output current per pin for the CD74HC154M?

The CD74HC154M supports ±25 mA DC output source/sink current per pin, as specified in the Absolute Maximum Ratings table of SCHS152D. This rating applies across the full -55°C to +125°C operating range and allows direct driving of LSTTL loads or small relays without external buffers - confirmed under "DC Output Source or Sink Current per Output Pin, IO".

Can the CD74HC154M be used in cascaded decoder configurations?

Yes, the CD74HC154M is explicitly designed for cascading via its dual enable inputs: one CD74HC154M can enable another by connecting its output to E1 or E2 of a downstream device. The datasheet's Functional Diagram and description confirm this capability for building 5-to-32 or 6-to-64 decoders - no additional logic gates are required for inter-stage control.