Nexperia USA Inc. 74HC154BQ,118

Overview

74HC154BQ,118 from Nexperia is a 4-to-16 line decoder/demultiplexer in DHVQFN24 package, decoding binary inputs A0–A3 into 16 active-LOW outputs (Y0–Y15), with dual active-LOW enable inputs (E0, E1) and CMOS-level compatibility. It operates from 2.0 V to 6.0 V across –40 °C to +125 °C, enabling address selection in memory mapping and I/O expansion for microcontroller-based industrial control systems.

For engineers reviewing the 74HC154BQ,118 datasheet, 74HC154BQ,118 pinout, 74HC154BQ,118 application, or 74HC154BQ,118 equivalent, key selection criteria include propagation delay (10–45 ns at VCC = 6.0 V / 2.0 V), output drive capability (±25 mA), thermal-enhanced DHVQFN24 packaging, and compatibility with 74HCT154BQ for TTL-level input interfacing.

Technical Context

This device implements a combinational logic decoder with two independent enable paths: both E0 and E1 must be LOW for any output to activate; a HIGH on either forces all outputs HIGH. Its internal architecture supports direct use as a 1-to-16 demultiplexer when one enable serves as data input and the other as strobe control.

Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The DHVQFN24 package (SOT815-1) features an exposed thermal pad (non-electrical, optional connection to VCC or floating) and 24 terminals in a 3.5 × 5.5 × 0.85 mm footprint, optimized for high-density PCB layouts requiring low thermal resistance.

Key Specifications

Pinout & Package

DHVQFN24 package (SOT815-1): 3.5 × 5.5 × 0.85 mm body, no leads, 24 copper terminals, thermal pad (terminal 1 index area, non-electrical, optional VCC or floating connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC154BQ,118, the 74HCT154BQ,118 offers superior TTL input compatibility at the expense of slightly higher quiescent current, while SN74HC154PWR trades thermal performance for finer-pitch manufacturability - choice depends on interface voltage family and thermal/power budget constraints.

Availability

74HC154BQ,118 is available at Aetrix Electronics and suitable for industrial control systems, automated test equipment, and embedded memory expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC154BQ,118 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 delivering high-performance, reliable logic, analog, and discrete components with focus on efficiency, miniaturization, and robustness for industrial and automotive markets.

The 74HC154BQ,118 belongs to Nexperia's HC logic family - designed for low-power, high-noise-immunity digital interfacing in space- and energy-constrained embedded systems operating across harsh environmental conditions.

FAQ

Can 74HC154BQ,118 operate at 3.3 V supply?

Yes. The 74HC154BQ,118 is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, VIH is guaranteed ≥ 2.31 V and VIL ≤ 1.09 V, with typical propagation delay of ~18 ns (CL = 50 pF). All DC and AC parameters remain valid per datasheet Table 5 and Table 8.

What is the function of the exposed thermal pad on the DHVQFN24 package?

The exposed pad (terminal 1 index area) is non-electrical and has no mandatory solder requirement. If soldered, it must remain electrically floating or be connected to VCC - not GND - to avoid violating internal bias conditions. Its primary role is thermal conduction to the PCB, reducing θJA by up to 35% compared to leaded packages.

How does the dual-enable architecture prevent output contention?

E0 and E1 are OR'd internally: if either is HIGH, all Y0–Y15 outputs go HIGH (inactive state). Only when both are LOW does the decoder respond to A0–A3. This ensures that partial address transitions or enable glitches never assert multiple outputs simultaneously, eliminating bus contention in dynamic address decoding.

Is 74HC154BQ,118 pin-compatible with 74HC154D (SO24) or 74HC154PW (TSSOP24)?

No. While functional and logic-pin equivalent (same signal names and positions), the DHVQFN24 (SOT815-1) has different physical pin numbering and layout versus SO24 (SOT137-1) and TSSOP24 (SOT355-1). Pin 1 (Y12) in BQ differs from pin 1 (Y0) in D/PW packages; PCB redesign is required for package substitution.