Nexperia USA Inc. 74HCT259BQ-Q100,11

Overview

74HCT259BQ-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 D-to-Q propagation delay at 4.5 V. Used in body control modules for selective LED driver enablement and I/O expansion in automotive microcontroller subsystems.

For engineers reviewing the 74HCT259BQ-Q100 datasheet, 74HCT259BQ-Q100 pinout, 74HCT259BQ-Q100 application, or 74HCT259BQ-Q100 equivalent, this page provides verified functional mode behavior, DHVQFN16 package terminal mapping, AEC-Q100 Grade 1 qualification evidence, and direct comparison against 74HCT259PW-Q100 and SN74HCT259N alternatives.

Technical Context

The device implements a synchronous 8-bit latch array with independent address decoding (A0–A2), active-low latch enable (LE), and active-low master reset (MR). Its four-mode operation is controlled solely by LE and MR logic levels per Table 4 - no internal state machine or clock domain crossing is involved.

All outputs are buffered CMOS push-pull with ±4.0 mA drive capability at 4.5 V, and input clamping diodes support interfacing to voltages beyond VCC. The DHVQFN16 package features side-wettable flanks for AOI-compatible solder joint inspection in automotive PCB assembly.

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1) with 16 terminals, no leads, thermal pad exposed on underside, side-wettable flanks for automated optical inspection. Body dimensions: 2.5 mm × 3.5 mm × 0.85 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT259PW-Q100, the BQ variant offers 35% lower θ_JA and AOI support; versus SN74HCT259N, it adds AEC-Q100 Grade 1 qualification, extended temperature range, and automotive-specific ESD robustness - making it the sole choice for production automotive systems.

Availability

74HCT259BQ-Q100 is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC I/O expansion, HVAC panel interfaces, and ADAS sensor power management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT259BQ-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 discrete components, with leadership in automotive-qualified devices.

This device belongs to Nexperia's automotive logic portfolio, designed specifically for AEC-Q100-compliant control and interface functions in harsh-environment electronic control units.

FAQ

What distinguishes 74HCT259BQ-Q100 from the HC variant?

The 74HCT259BQ-Q100 uses TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at 4.5 V), enabling direct connection to legacy 5 V TTL outputs without level shifters. In contrast, the 74HC259BQ-Q100 requires CMOS-level inputs (VIH ≥ 3.15 V at 4.5 V), limiting interoperability with older microcontrollers and peripheral ICs.

Can MR and LE be asserted simultaneously?

Yes - asserting both MR (LOW) and LE (LOW) places the device in reset mode per Table 4, forcing all Q0–Q7 outputs LOW regardless of D or address inputs. This behavior is explicitly defined and electrically guaranteed; no contention or undefined state occurs.

Is the exposed thermal pad on the DHVQFN16 package required to be soldered?

No - the thermal pad (terminal 1) has no electrical function and requires no solder connection. If soldered, it must remain floating or be connected to GND; it is not internally bonded to any signal or power net per SOT763-1 mechanical drawing and datasheet note.

How does the device behave during power-up at VCC = 4.5 V?

At power-up, all outputs enter high-impedance until VCC exceeds 2.0 V and stabilizes; then MR and LE determine initial state. With MR = HIGH and LE = HIGH, the device enters memory mode - preserving previous latch states if powered from backup supply, or presenting indeterminate but non-damaging outputs if cold-started.