Nexperia USA Inc. 74HCT4040BQ-Q100X

Overview

74HCT4040BQ-Q100 from Nexperia is an AEC-Q100 Grade 1 qualified 12-stage binary ripple counter with asynchronous master reset (MR), clock input (CP), and twelve TTL-level outputs (Q0–Q11). It advances on the HIGH-to-LOW CP edge, clears all stages when MR is HIGH, and operates from 4.5 V to 5.5 V across –40 °C to +125 °C - used in automotive timing control and frequency division circuits.

For engineers reviewing the 74HCT4040BQ-Q100 datasheet, 74HCT4040BQ-Q100 pinout, 74HCT4040BQ-Q100 application, or 74HCT4040BQ-Q100 equivalent, key selection factors include its automotive qualification, DHVQFN16 package with side-wettable flanks for AOI, TTL-compatible inputs, 12-bit ripple architecture, and guaranteed propagation delay ≤60 ns at 4.5 V.

Technical Context

This device implements a cascaded chain of 12 static toggle flip-flops, where each stage divides the preceding stage's output by two - resulting in Qn = CP ÷ 2ⁿ. The asynchronous MR overrides all clocking behavior, forcing Q0–Q11 LOW regardless of CP state.

Input clamping diodes enable safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Its CMOS core delivers low power dissipation (ICC ≤160 μA at 5.5 V, –40 °C to +125 °C) while maintaining TTL-level input thresholds (VIH ≥2.0 V, VIL ≤0.8 V at VCC = 4.5 V–5.5 V).

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1) with 16 terminals, no leads, side-wettable flanks for automated optical inspection, and exposed thermal pad (non-electrical, floating or GND-connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit ripple counter applications.

Compared with 74HC4040BQ-Q100 and SN74LV4040APWR, the 74HCT4040BQ-Q100 uniquely balances automotive qualification, TTL compatibility, and DHVQFN reliability - making it the only choice for safety-critical 5 V timing in production vehicles.

Availability

74HCT4040BQ-Q100 is available at Aetrix Electronics and suitable for automotive lighting control, engine timing reference, and infotainment clock management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT4040BQ-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 leading semiconductor manufacturer specializing in high-performance, reliable logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74HCT4040BQ-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically for robust timing, counting, and signal conditioning in harsh-temperature vehicle subsystems.

FAQ

What is the maximum clock frequency supported by the 74HCT4040BQ-Q100?

The device supports a maximum clock frequency of 24 MHz at VCC = 4.5 V and Tamb = –40 °C to +85 °C, dropping to 20 MHz at +125 °C ambient. This is derived from the CP-to-Q0 propagation delay specification (≤60 ns at 4.5 V, CL = 50 pF) and accounts for cumulative ripple delay across all 12 stages.

Can the 74HCT4040BQ-Q100 be used with a 3.3 V microcontroller?

No - the 74HCT4040BQ-Q100 requires VCC = 4.5–5.5 V and has TTL-level inputs (VIH ≥2.0 V), but its minimum high-level input voltage is specified only at 4.5–5.5 V supply. Driving CP or MR from a 3.3 V MCU violates recommended operating conditions and risks unreliable switching; a level shifter or 74HC4040 variant is required.

Is the exposed thermal pad on the DHVQFN16 package electrically connected?

No - the exposed pad (terminal 1 index area) is not electrically connected to any internal node. Per Nexperia's datasheet, it has no electrical or mechanical requirement to be soldered; if soldered, it must remain floating or be connected to GND to avoid unintended coupling or thermal stress.

How does the asynchronous master reset (MR) behave during power-up?

MR is active HIGH and asynchronous - asserting MR forces Q0–Q11 LOW immediately, regardless of CP state or power-rail stability. To ensure known initial state, MR should be held HIGH until VCC reaches minimum operating voltage (4.5 V) and stabilized, then released. An RC-based power-on reset circuit is recommended for automotive systems.