NXP Semiconductors 74HCT154N,652

Overview

74HCT154N,652 from Nexperia is a TTL-compatible 4-to-16 line decoder/demultiplexer in a 24-pin DIP package. It decodes four binary address inputs (A0–A3) into sixteen active-LOW outputs (Y0–Y15), features dual active-LOW enable inputs (E0, E1), operates from 4.5 V to 5.5 V, and is specified for -40 °C to +125 °C ambient temperature. It enables 1-of-16 address decoding in microcontroller I/O expansion systems.

For engineers reviewing the 74HCT154N,652 datasheet, 74HCT154N,652 pinout, 74HCT154N,652 application, or 74HCT154N,652 equivalent, key selection factors include TTL-level input compatibility, active-LOW output logic, dual enable control for cascading, propagation delay under 53 ns at 4.5 V, and DIP-24 through-hole mounting for prototyping and legacy board designs.

Technical Context

The 74HCT154N,652 implements combinational logic decoding using standard CMOS circuitry with TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V). Its two enable inputs (E0, E1) are ANDed internally-both must be LOW for any output to go LOW; either HIGH forces all outputs HIGH.

Output behavior follows strict mutual exclusivity: only one Yn output is asserted LOW per unique A3:A0 combination when enables are active, supporting precise 1-of-16 selection in memory addressing, peripheral chip select, and LED multiplexing applications without bus contention.

Key Specifications

Pinout & Package

74HCT154N,652 is supplied in a plastic dual in-line package (DIP-24), 300 mil body width, with 0.3 inch row spacing and through-hole leads. Pin 1 is marked by a notch or dot on the package top.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC154N,652 and SN74LS154N, the 74HCT154N,652 uniquely balances TTL input compatibility, low power, and industrial temperature support - making it optimal for modern 5 V embedded controllers needing reliable, pin-compatible upgrades from LS logic without redesigning input drive circuitry.

Availability

74HCT154N,652 is available at Aetrix Electronics and suitable for memory address decoding, peripheral chip select logic, LED matrix row selection, and industrial control output multiplexing requiring stable component supply across extended temperature ranges.

Supply support for 74HCT154N,652 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 leading semiconductor manufacturer specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer markets.

The 74HCT154N,652 belongs to Nexperia's 74HCT logic family, engineered for seamless interoperability with legacy TTL systems while delivering CMOS power efficiency and robust industrial-grade reliability.

FAQ

What is the function of the E0 and E1 pins on the 74HCT154N,652?

The E0 and E1 pins on the 74HCT154N,652 are active-LOW enable inputs. Both must be LOW for the decoder to operate - only then will the Y0–Y15 outputs respond to A0–A3 address inputs. If either E0 or E1 is HIGH, all outputs are forced HIGH. This dual-enable architecture supports cascading multiple 74HCT154N,652 devices for larger decode trees, such as 5-to-32 or 6-to-64 expansion, without external gating logic.

Does the 74HCT154N,652 support 3.3 V logic inputs?

No, the 74HCT154N,652 does not reliably accept 3.3 V logic inputs. Its TTL-compatible input thresholds require VIH ≥ 2.0 V (min) and VIL ≤ 0.8 V (max) at VCC = 4.5–5.5 V. While a 3.3 V HIGH may occasionally register, it falls below the guaranteed VIH spec and risks misoperation across temperature and voltage tolerances. For 3.3 V systems, use the 74HC154N,652 or add a level shifter.

What package type is used for the 74HCT154N,652?

74HCT154N,652 uses a plastic dual in-line package (DIP-24) with 24 through-hole leads, 300 mil body width, and 0.3 inch row spacing. This package is designated SOT101-1 in Nexperia's ordering nomenclature and is optimized for breadboarding, prototyping, and legacy PCB assembly where surface-mount alternatives like TSSOP24 or DHVQFN24 are unsuitable.

Can the 74HCT154N,652 be used as a demultiplexer?

Yes, the 74HCT154N,652 can be configured as a 1-to-16 demultiplexer. Tie one enable (e.g., E1) LOW to activate decoding, then apply the data signal to the other enable (E0). The addressed Yn output will follow the logic state of E0, while all unaddressed outputs remain HIGH. This mode is explicitly documented in Figure 9 of the Nexperia datasheet and leverages the device's inherent enable-controlled output behavior.

What is the maximum propagation delay for the 74HCT154N,652 over its full temperature range?

The maximum propagation delay for the 74HCT154N,652 is 53 ns, measured from address input (An) or enable input (En) to output (Yn) under worst-case conditions: VCC = 4.5 V, CL = 50 pF, and ambient temperature from -40 °C to +125 °C. This value is specified in Table 8 of the Nexperia datasheet Rev. 10 and ensures timing compliance in real-time control loops and synchronous bus systems.