Nexperia USA Inc. 74HCT154D,653

Overview

74HCT154D,653 from Nexperia is a TTL-level-compatible 4-to-16 line decoder/demultiplexer in SO24 package, featuring active-LOW 16 outputs (Y0–Y15), dual active-LOW enable inputs (E0, E1), and operation across 4.5 V to 5.5 V supply. It decodes binary address inputs A0–A3 to select exactly one output per cycle and supports demultiplexing by routing data through an enable pin. Used in memory address decoding and I/O port expansion for industrial microcontroller systems.

For engineers reviewing the 74HCT154D,653 datasheet, 74HCT154D,653 pinout, 74HCT154D,653 application, or 74HCT154D,653 equivalent, this device serves as a deterministic 1-of-16 selection element with guaranteed timing at 5 V, TTL-compatible input thresholds, and robust latch-up immunity - critical for reliable address decoding in noise-prone embedded control environments.

Technical Context

The 74HCT154D,653 implements combinational logic decoding using standard CMOS process with TTL-input threshold compatibility (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V). Its two enable inputs operate in OR logic: either E0 or E1 HIGH forces all outputs HIGH (disabled state); only when both are LOW does decoding activate.

Propagation delay from address input to output is 16 ns (typ) / 53 ns (max) at VCC = 4.5 V and CL = 50 pF; enable-to-output delay matches closely at 15 ns (typ) / 48 ns (max). Output drive capability is ±4 mA at VOH ≥ 3.7 V and VOL ≤ 0.4 V under full temperature range (−40 °C to +125 °C).

Key Specifications

Pinout & Package

74HCT154D,653 uses the SO24 (SOT137-1) plastic small outline package: 24-pin, 7.5 mm body width, 1.27 mm pitch, gull-wing leads. Pin 1 index located at top-left corner with notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC154D,653, the 74HCT154D,653 offers tighter input compatibility with legacy TTL sources and lower static current, while SN74LS154N trades higher power and speed penalty for proven bipolar robustness in vintage test equipment.

Availability

74HCT154D,653 is available at Aetrix Electronics and suitable for memory address decoding, I/O port expansion, industrial bus arbitration, and LED matrix row selection requiring stable component supply across extended temperature ranges.

Supply support for 74HCT154D,653 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

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HCT series targets interoperability between TTL and CMOS systems, emphasizing low-power, wide-supply, and industrial-grade reliability - specifically engineered for robust address decoding and signal routing in harsh environments.

FAQ

What is the maximum clock frequency supported for address changes?

The 74HCT154D,653 has no internal clock; it is purely combinational. Maximum reliable address update rate depends on propagation delay (≤53 ns max) and setup/hold margins. For clean transitions, keep address changes ≥100 ns apart at VCC = 4.5 V to avoid glitches on multiple outputs during transition.

Can Y0–Y15 drive LEDs directly?

Yes - each output sinks up to 4 mA at VOL ≤ 0.4 V (VCC = 4.5 V, −40 °C to +125 °C), sufficient for low-current indicator LEDs (e.g., 2 mA @ 1.8 V forward voltage with 1 kΩ series resistor). Do not exceed 4 mA per pin or 50 mA total package current.

Why do both E0 and E1 need to be LOW for decoding?

E0 and E1 implement OR logic: if either is HIGH, all outputs go HIGH (disabled). This allows hierarchical decoding - e.g., one 74HCT154D,653 can be enabled only when a higher-order address bit is LOW, enabling modular address space partitioning without additional gates.

Is the SO24 package RoHS-compliant and lead-free?

Yes - the 74HCT154D,653 in SOT137-1 (SO24) package is RoHS-compliant and fully lead-free per Nexperia's product compliance documentation (reference: Nexperia Declaration of Conformity DOC-2023-00124). Terminal finish is matte tin, compatible with standard Pb-free reflow profiles.