Nexperia USA Inc. 74HC259PW,112

Overview

74HC259PW,112 from Nexperia is an 8-bit addressable latch IC with four operational modes: addressable latch, memory, 3-to-8 demultiplexing, and reset. It operates from 2.0 V to 6.0 V, supports -40 °C to +125 °C ambient range, features TTL-compatible inputs (74HCT variant), and delivers 8 independent latch outputs (Q0–Q7) with active-low LE and MR controls. It is used in serial-to-parallel data conversion for microcontroller I/O expansion.

For engineers reviewing the 74HC259PW,112 datasheet, 74HC259PW,112 pinout, 74HC259PW,112 application, or 74HC259PW,112 equivalent, this device serves as a configurable latch/demux solution where precise output addressing, low-power CMOS logic, and deterministic reset behavior are required in industrial control interfaces and embedded peripheral management.

Technical Context

The 74HC259PW,112 implements a combinational address decoder driving eight individual D-type latches, each selectable via three address lines (A0–A2). Its mode selection depends on the logic states of LE (latch enable, active LOW) and MR (master reset, active LOW), enabling deterministic state control without clock edges.

It integrates input clamp diodes for overvoltage tolerance, supports CMOS-level inputs (74HC) or TTL-level inputs (74HCT), and provides simultaneous access to all eight latch outputs - making it suitable for static output configuration in systems requiring non-volatile data retention during address transitions.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1); 16 leads; body width 4.4 mm; 0.65 mm pitch; exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC259PW,112, the 74HCT259PW,112 offers guaranteed TTL input compatibility at 5 V but sacrifices 2 V operation, while SN74LV259APWR reduces power and improves 3.3 V performance but narrows voltage and temperature margins - choice depends on system-level voltage architecture and environmental requirements.

Availability

74HC259PW,112 is available at Aetrix Electronics and suitable for industrial I/O expansion, LED matrix control, programmable logic interfaces, and test fixture signal routing requiring stable component supply across extended temperature ranges.

Supply support for 74HC259PW,112 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 logic, analog, and discrete components, with global R&D and manufacturing infrastructure.

The 74HC259 product line delivers standardized, pin-compatible logic functions optimized for industrial reliability, low power, and wide supply voltage operation - targeting embedded control, automation, and signal routing applications.

FAQ

What is the difference between 74HC259PW and 74HCT259PW?

The 74HC259PW uses CMOS-level input thresholds (VIH ≥ 70% VCC), while the 74HCT259PW uses TTL-compatible thresholds (VIH ≥ 2.0 V at VCC = 4.5–5.5 V). Both share identical pinout, functionality, and packaging. The HCT version ensures reliable interfacing with legacy 5 V TTL outputs without level shifting, whereas HC supports broader VCC scaling down to 2.0 V.

Can 74HC259PW,112 operate at 3.3 V supply?

Yes - the 74HC259PW,112 is fully specified from 2.0 V to 6.0 V, including 3.3 V operation. At VCC = 3.3 V, VIH = 2.31 V (min), VIL = 1.0 V (max), VOH = 3.15 V (min at IO = –4 mA), and VOL = 0.26 V (max at IO = 4 mA), meeting standard 3.3 V LVTTL and LVCMOS interface requirements.

How does the reset (MR) pin interact with latch enable (LE)?

MR (active LOW) has unconditional priority: when MR = LOW, all Qn outputs force LOW regardless of LE, D, or address states. When MR = HIGH, LE determines mode - LE = LOW enables addressable latching, LE = HIGH enables memory mode. MR is asynchronous and overrides all other inputs.

Is Pin 15 (NC) required to be grounded?

No - Pin 15 is internally unconnected. Nexperia's datasheet states it may be left floating or tied to GND per PCB layout preference; no electrical requirement exists. If soldered, the pad must remain electrically floating or connected to GND - never to VCC or signal nets.