Nexperia USA Inc. 74HCT259PW,118

Overview

74HCT259PW,118 from Nexperia is an 8-bit addressable latch with TTL-compatible input levels, operating from 4.5 V to 5.5 V, supporting four functional modes (addressable latch, memory, 3-to-8 demultiplexing, and reset), and delivering 4.32 V VOH at 4.5 V supply with 4 mA sink/source - used in industrial I/O expansion and microcontroller peripheral interfacing.

For engineers reviewing the 74HCT259PW,118 datasheet, 74HCT259PW,118 pinout, 74HCT259PW,118 application, or 74HCT259PW,118 equivalent, key selection criteria include its active-low LE/MR control logic, 37 ns typical propagation delay (VCC = 4.5 V), TSSOP16 thermal performance, and compatibility with 5 V TTL bus systems requiring deterministic output state control.

Technical Context

This device implements a dual-function architecture: an 8-bit parallel latch array with individual address decoding (A0–A2) and a 3-to-8 active-HIGH decoder, both sharing D, LE, and MR inputs. Its mode selection depends solely on the logic states of LE and MR per Table 4 - no internal clock or state machine governs operation.

All eight Q outputs are individually accessible and retain state in memory mode (LE = HIGH, MR = HIGH); in demux mode (LE = LOW, MR = LOW), only the addressed output follows D while others drive LOW. Input clamp diodes enable safe interfacing to voltages exceeding VCC when current-limiting resistors are used.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1), 16-pin, 4.4 mm body width, 0.65 mm pitch, exposed pad not electrically connected - optimized for automated assembly and moderate thermal dissipation (500 mW max at Tamb ≤ 91 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC259PW,118 and SN74LS259N, the 74HCT259PW,118 uniquely balances TTL input compatibility, low power, and integrated reset - making it optimal for modern 5 V embedded systems requiring deterministic, low-risk I/O expansion.

Availability

74HCT259PW,118 is available at Aetrix Electronics and suitable for industrial I/O expansion, microcontroller peripheral interface, automotive body control modules, and test equipment signal routing requiring stable component supply across extended temperature ranges.

Supply support for 74HCT259PW,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 specializing in high-volume, high-reliability logic, analog, and MOSFET solutions - founded as part of NXP and now independently focused on essential semiconductor components.

The 74HCT series targets 5 V TTL-compatible digital logic applications, designed specifically to bridge legacy TTL systems with modern low-power CMOS processes while maintaining pin-for-pin compatibility and robust industrial qualification.

FAQ

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

The MR pin is an asynchronous, active-LOW input that forces all eight outputs (Q0–Q7) to LOW regardless of LE, D, or address states. It operates independently of clock or enable signals, providing immediate hardware-level reset - critical for safety-critical or initialization sequences in automotive and industrial systems.

Can 74HCT259PW,118 operate at 3.3 V supply?

No - the 74HCT259PW,118 is specified only for 4.5 V to 5.5 V operation per Table 6. At 3.3 V, input thresholds (VIH ≥ 2.0 V) may still be met, but VOH drops below TTL HIGH recognition limits and propagation delays increase beyond specification; use 74HC259PW,118 instead for 3.3 V systems.

How does the addressable latch mode differ from demultiplexer mode?

In addressable latch mode (LE = LOW, MR = HIGH), only the addressed Qn follows D while other outputs retain prior values. In demultiplexer mode (LE = LOW, MR = LOW), the addressed Qn follows D and all unaddressed Qn drive LOW - enabling single-channel signal routing rather than selective storage.

Is the TSSOP16 package RoHS-compliant and lead-free?

Yes - the 74HCT259PW,118 in SOT403-1 (TSSOP16) packaging meets RoHS Directive 2011/65/EU and is fully lead-free, with matte tin (Sn) termination finish and halogen-free molding compound, certified per Nexperia's material declarations and IPC-J-STD-609.