Nexperia USA Inc. 74HCT259BZX

Overview

74HCT259BZX from Nexperia is an 8-bit addressable latch with TTL-compatible inputs, operating from 4.5 V to 5.5 V, supporting four distinct modes (addressable latch, memory, 3-to-8 demultiplexing, and reset), and delivering 5.2 mA output drive at V_CC = 5.0 V - used in industrial I/O expansion and LED matrix control.

For engineers reviewing the 74HCT259BZX datasheet, 74HCT259BZX pinout, 74HCT259BZX application, or 74HCT259BZX equivalent, this page delivers verified functional modes, real-world timing values (e.g., 22 ns LE→Q_n @ 4.5 V), package-specific thermal limits (250 mW for DHXQFN16), and validated alternative parts with documented electrical and mode-level differences.

Technical Context

The device implements a dual-path logic architecture: one path routes D input through address decoding (A0–A2) to select one of eight outputs in demux mode; another path enables random-access latching via LE and MR control signals. All outputs retain state in memory mode when LE and MR are HIGH.

Input thresholds follow TTL levels (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V at V_CC = 5.0 V), ensuring compatibility with legacy 5 V microcontrollers. The DHXQFN16 package (SOT8016-1) provides 0.4 mm pitch, 2.0 × 2.4 mm body, and thermal pad for enhanced power dissipation up to 250 mW at T_amb ≤ +125 °C.

Key Specifications

Pinout & Package

DHXQFN16 (SOT8016-1) package: leadless, 2.0 mm × 2.4 mm × 0.48 mm body, 0.4 mm pitch, exposed thermal pad (non-electrical unless connected to GND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit addressable latch applications.

Compared with 74HCT373PW and SN74LV8154IPW, the 74HCT259BZX uniquely integrates address decoding, latch, and reset in one 16-pin package - eliminating external logic while supporting both random-access and demux functions without firmware overhead.

Availability

74HCT259BZX is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, LED matrix row driving, microcontroller peripheral interfacing, and test equipment signal routing requiring stable component supply across extended temperature ranges.

Supply support for 74HCT259BZX 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 specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer markets.

The 74HCT259BZX belongs to Nexperia's 74HCT logic family, designed specifically for robust 5 V TTL-compatible interfacing in harsh environments where reliability, wide temperature range, and low static power are critical.

FAQ

What is the function of the MR (Master Reset) pin?

The MR pin is an active-LOW asynchronous reset that forces all eight outputs (Q0–Q7) LOW regardless of LE, address, or D input states. It overrides all other control signals and remains effective even when LE is HIGH or the device is in memory mode. No setup/hold timing is required relative to MR assertion.

Can the 74HCT259BZX operate at 3.3 V?

No - the 74HCT259BZX is specified only for 4.5 V to 5.5 V supply. Its TTL-compatible inputs require V_IH ≥ 2.0 V and V_IL ≤ 0.8 V, which are guaranteed only within that V_CC range. At 3.3 V, input thresholds and output drive fall outside specification, risking unreliable operation.

How does the DHXQFN16 package affect thermal design?

The SOT8016-1 package has a maximum P_tot of 250 mW at T_amb ≤ +125 °C, significantly lower than SO16 (500 mW). To achieve rated power, the exposed thermal pad must be soldered to a minimum 100 mm² copper pour connected to GND. Without thermal pad connection, derating to ~120 mW is required.

Is the 74HCT259BZX pin-compatible with the 74HC259BZX?

Yes - both share identical pinout, package dimensions, and footprint (SOT8016-1), but differ in input threshold behavior: 74HC259BZX uses CMOS thresholds (V_IH ≈ 0.7×V_CC), while 74HCT259BZX uses fixed TTL thresholds. Swapping requires verifying source driver compatibility with respective input voltage requirements.