Nexperia USA Inc. 74HC259BQ,115

Overview

74HC259BQ,115 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 74HC259BQ,115 datasheet, 74HC259BQ,115 pinout, 74HC259BQ,115 application, or 74HC259BQ,115 equivalent, key selection criteria include its dual-mode functionality (latch + decoder), active-low LE/MR control logic, DHVQFN16 thermal-enhanced package, and compatibility with 3.3 V/5 V mixed-signal systems.

Technical Context

The device implements a combinational address decoder driving eight independent D-type latches, where A0–A2 select one of eight outputs for data capture on the falling edge of LE. Its MR input forces all Qn outputs LOW independently of address or data state.

Input clamp diodes enable safe interfacing with voltages exceeding VCC when current-limiting resistors are used. The latch retains state during memory mode (LE HIGH, MR HIGH), enabling non-volatile hold without clocking.

Key Specifications

Pinout & Package

DHVQFN16 (SOT763-1) package: 2.5 × 3.5 × 0.85 mm body, 16-terminal leadless construction with exposed thermal pad; optimized for high-density PCBs and improved thermal performance over SO16/TSSOP.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC259BQ,115, the 74HCT259BQ,115 offers guaranteed TTL input compatibility at the cost of slightly higher ICC, while SN74HC259PWR trades DHVQFN's thermal advantage for broader assembly ecosystem support - selection depends on signal threshold requirements and manufacturing infrastructure.

Availability

74HC259BQ,115 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, test equipment signal routing, and consumer appliance control panels requiring stable component supply across extended temperature ranges.

Supply support for 74HC259BQ,115 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 core expertise in energy-efficient, automotive-qualified devices.

The 74HC259 product line delivers robust, multi-function logic building blocks for industrial and automotive control systems - designed to reduce component count and improve reliability in space-constrained, thermally demanding applications.

FAQ

What is the function of the MR pin on the 74HC259BQ,115?

The MR (Master Reset) pin is an active-LOW asynchronous input that forces all eight Qn outputs LOW regardless of LE, address, or data state. It does not affect internal latch states - outputs return to prior values when MR is deasserted, unless LE triggers a new update. This enables fail-safe shutdown in safety-critical systems.

Can the 74HC259BQ,115 operate at 2.5 V supply voltage?

Yes - the 74HC259BQ,115 is fully specified from 2.0 V to 6.0 V. At 2.5 V, VIH is 1.75 V min and VOL is 0.26 V max at 4.0 mA load, ensuring reliable noise margins with 2.5 V microcontrollers. Propagation delay increases to 58 ns (max), supporting ~10 MHz update rates.

How does the addressable latch mode differ from memory mode?

In addressable latch mode (LE LOW, MR HIGH), only the Qn output selected by A0–A2 follows the D input on LE edge; others retain state. In memory mode (LE HIGH, MR HIGH), all Qn outputs freeze - no change occurs even if D or A0–A2 change. This enables static output retention during MCU sleep or interrupt latency.

Is the thermal pad on the DHVQFN16 package electrically connected?

No - the exposed thermal pad (terminal 1) is not electrically connected to any internal node. It must be soldered to a PCB ground plane solely for thermal conduction. If connected, it must remain floating or tied to GND; no voltage or signal routing is permitted to this pad.