Nexperia USA Inc. 74HCT259PW-Q100,11

Overview

74HCT259PW-Q100 from Nexperia is an automotive-qualified 8-bit addressable latch with TTL-compatible inputs, operating from 4.5 V to 5.5 V across –40 °C to +125 °C. It supports four functional modes-addressable latch, memory, 3-to-8 demultiplexing, and reset-and delivers 23 ns propagation delay (D→Qn) at 4.5 V, enabling precise serial-to-parallel data routing in body control modules.

For engineers reviewing the 74HCT259PW-Q100 datasheet, 74HCT259PW-Q100 pinout, 74HCT259PW-Q100 application, or 74HCT259PW-Q100 equivalent, this device serves as a drop-in-replaceable, AEC-Q100 Grade 1–qualified alternative to legacy 74HCT259 variants in space-constrained automotive PCBs requiring deterministic latch timing and robust ESD immunity (HBM >2000 V).

Technical Context

The 74HCT259PW-Q100 implements a synchronous addressable latch architecture with active-low LE and MR controls, where A0–A2 select one of eight Q outputs for data capture while non-addressed outputs retain state. Its TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V) ensure compatibility with legacy microcontroller GPIOs without level-shifting.

Mode selection is determined solely by LE and MR logic states: LE = LOW + MR = HIGH enables addressable latching; LE = HIGH + MR = HIGH holds all outputs; LE = LOW + MR = LOW activates 3-to-8 demultiplexing; LE = HIGH + MR = LOW forces all outputs LOW. Output drive strength is ±4.0 mA (VOH/VOL) at VCC = 4.5 V, supporting direct LED or small-signal transistor interfacing.

Key Specifications

Pinout & Package

TSSOP16 plastic thin shrink small outline package (SOT403-1), 4.4 mm body width, 0.65 mm lead pitch, side-wettable flanks for AOI-compatible solder joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT259D-Q100 and 74HCT259BQ-Q100, the 74HCT259PW-Q100 balances compactness (4.4 mm width), manufacturability (side-wettable flanks), and thermal margin (8.5 mW/K derating), making it optimal for mid-volume automotive modules targeting IPC-A-610 Class 3 assembly.

Availability

74HCT259PW-Q100 is available at Aetrix Electronics and suitable for automotive body control modules, instrument cluster driver circuits, and door module actuator interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT259PW-Q100 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, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HCT259-Q100 series belongs to Nexperia's automotive-qualified logic portfolio, engineered specifically for robust serial-to-parallel data expansion in harsh-environment electronic control units with AEC-Q100 Grade 1 compliance.

FAQ

What is the minimum setup time required for the D input relative to the LE falling edge?

The 74HCT259PW-Q100 requires a minimum D input setup time (tsu) of 17 ns before the LE falling edge at VCC = 4.5 V, as specified in Table 8. This ensures reliable data capture into the addressed latch without metastability. Violating this timing may result in indeterminate Q output states, particularly under worst-case temperature and voltage conditions.

Can the MR pin be left unconnected if reset functionality is not used?

No - the MR pin must be actively driven HIGH (to VCC) via a pull-up resistor if not used, because it is active LOW and internally uncommitted. Leaving it floating risks unintended reset events due to noise coupling, especially in automotive EMI environments. A 10 kΩ pull-up to VCC is recommended per Nexperia application guidance.

Does the 74HCT259PW-Q100 support hot insertion or live insertion into a powered backplane?

No - the 74HCT259PW-Q100 lacks hot-swap protection circuitry such as power-on reset, I²C-style slew-rate limiting, or back-drive immunity. Applying VCC before GND or inserting into a live system may cause latch-up or permanent damage due to input clamping diode conduction paths. Power sequencing per JESD78 Class II Level B is mandatory.

How does the device behave when A0–A2 are changed while LE is HIGH and MR is HIGH?

When LE = HIGH and MR = HIGH, the device operates in memory mode: all Q outputs retain their previously latched states regardless of changes to A0–A2 or D inputs. Address lines become irrelevant in this mode, and no output transitions occur - this behavior is explicitly defined in Table 4 and verified across –40 °C to +125 °C.