Nexperia USA Inc. 74HC259DB,118

Overview

74HC259DB,118 from Nexperia is an 8-bit addressable latch IC with four operational modes: addressable latch, memory, 3-to-8 demultiplexing, and reset. It features CMOS-level inputs, operates from 2.0 V to 6.0 V, supports -40 °C to +125 °C ambient range, and delivers 17 ns propagation delay at 6.0 V - used in industrial I/O expansion and serial-to-parallel data conversion.

For engineers reviewing the 74HC259DB,118 datasheet, 74HC259DB,118 pinout, 74HC259DB,118 application, or 74HC259DB,118 equivalent, this device serves as a configurable latch/demux for microcontroller peripheral interfacing, LED matrix control, and address-decoded memory mapping where selective output updating and common reset are required.

Technical Context

The 74HC259DB,118 implements a dual-function architecture combining an 8-bit latch array with a 3-to-8 decoder. Its mode selection is determined by the logic states of MR (active LOW reset) and LE (active LOW latch enable), enabling deterministic state control without clock edges.

Each of the eight Q outputs reflects D input only when its A0–A2 address matches and LE is asserted; non-addressed latches retain prior states. In demux mode (MR = L, LE = L), exactly one output follows D while others drive LOW - supporting active-HIGH decoding without external inverters.

Key Specifications

Pinout & Package

74HC259DB,118 is packaged in SSOP16 (SOT338-1), a 16-pin shrink small outline package with 0.65 mm pitch, 4.4 mm body width, and exposed thermal pad - optimized for high-density PCB layouts with improved thermal performance over SO16.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT259DB,118, the original part offers superior noise immunity in CMOS-only systems, while SN74HC259N trades miniaturization for mechanical robustness and hand-soldering compatibility - making each optimal for distinct design phases and integration contexts.

Availability

74HC259DB,118 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, LED matrix row driving, and microcontroller peripheral interfacing requiring stable component supply across extended temperature ranges.

Supply support for 74HC259DB,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 leading semiconductor manufacturer specializing in high-performance logic, analog, and discrete components, with global R&D and manufacturing facilities focused on reliability and energy efficiency.

The 74HC259 belongs to Nexperia's HC-series high-speed CMOS logic family, designed for low-power, wide-supply-range digital interfacing in industrial, automotive, and consumer applications demanding robust static and dynamic performance.

FAQ

What are the key differences between 74HC259DB,118 and 74HCT259DB,118?

The 74HC259DB,118 uses CMOS-level inputs (VIH ≥ 70% VCC), while the 74HCT259DB,118 features TTL-compatible inputs (VIH = 2.0 V min at VCC = 4.5–5.5 V). Both share identical pinout, packaging, and functional behavior. The HCT variant ensures reliable interfacing with legacy 5 V TTL outputs without level shifting, whereas HC offers better noise margin in pure CMOS systems.

Can 74HC259DB,118 operate reliably at 2.0 V supply?

Yes - the device is fully specified from 2.0 V to 6.0 V. At 2.0 V, it maintains guaranteed VIH (1.5 V min) and VOL (0.1 V max at 20 μA), with 185 ns maximum propagation delay. This makes it suitable for battery-powered or ultra-low-voltage systems where 3.3 V regulation is unavailable.

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

MR is prioritized over LE: when MR = LOW, all Q outputs force LOW regardless of LE, address, or D state. Only when MR = HIGH does LE control latch behavior. This hierarchy ensures fail-safe reset capability - critical for safety-critical I/O control where outputs must default to known states during faults.

Is the SSOP16 (SOT338-1) package thermally adequate for continuous 25 mA output loading?

Yes - the SSOP16 package has a thermal resistance θJA of ~120 K/W. With 8 outputs sourcing/sinking 25 mA each at 6.0 V (max 120 mW total dissipation), junction temperature rise remains within limits at ≤+85 °C ambient. For +125 °C operation, derating to ≤15 mA per output is recommended per Nexperia's Ptot derating curves.