Nexperia USA Inc. 74HCT4040DB-Q100J

Overview

74HCT4040DB-Q100 from Nexperia is an automotive-grade 12-stage binary ripple counter with TTL-compatible inputs, asynchronous master reset (MR), and twelve outputs (Q0–Q11) advancing on HIGH-to-LOW clock transitions. It operates from 4.5 V to 5.5 V, supports -40 °C to +125 °C ambient range, and delivers propagation delay as low as 19 ns (CP→Q0 at VCC = 4.5 V). It is used in automotive timing control circuits requiring AEC-Q100 Grade 1 qualification.

For engineers reviewing the 74HCT4040DB-Q100 datasheet, 74HCT4040DB-Q100 pinout, 74HCT4040DB-Q100 application, or 74HCT4040DB-Q100 equivalent, this device serves as a high-reliability frequency divider and time-delay counter in engine control units, body electronics, and ADAS subsystems where deterministic ripple counting and robust reset behavior are required.

Technical Context

The 74HCT4040DB-Q100 implements a cascaded chain of twelve static toggle flip-flops, each triggered by the falling edge of its preceding stage's output - resulting in inherent ripple propagation delay between Qn and Qn+1. Its MR input overrides all stages asynchronously, forcing Q0–Q11 LOW regardless of CP state.

TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5 V) ensure compatibility with legacy 5 V logic families, while CMOS output drive (VOH ≥ 3.98 V, VOL ≤ 0.26 V at IO = ±4 mA) maintains noise margin across automotive load conditions.

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1): 2.5 × 3.5 × 0.85 mm body, side-wettable flanks for AOI, no leads, 16 terminals, thermal pad (non-electrical, optional GND connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4040BQ-Q100 and SN74LV4040APWR, the 74HCT4040DB-Q100 uniquely balances TTL input compatibility, AEC-Q100 Grade 1 qualification, and DHVQFN thermal performance - making it the sole option for safety-critical 5 V automotive timing where legacy logic interfacing and under-hood temperature resilience are mandatory.

Availability

74HCT4040DB-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS sensor modules, and instrument cluster timing circuits requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT4040DB-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, discrete, and MOSFET solutions with leadership in automotive qualification and miniaturized packaging.

The 74HCT4040DB-Q100 belongs to Nexperia's automotive logic portfolio, designed specifically for timing-critical functions in powertrain, chassis, and body electronics where AEC-Q100 compliance and thermal robustness are non-negotiable.

FAQ

What is the maximum clock frequency supported by the 74HCT4040DB-Q100?

The 74HCT4040DB-Q100 supports a maximum clock frequency of 72 MHz (typical) at VCC = 4.5 V and CL = 50 pF. At worst-case conditions (-40 °C to +125 °C, VCC = 4.5 V), fmax drops to 20 MHz. This limit arises from cumulative ripple delay across 12 stages - Q11 exhibits ~12× the CP→Q0 delay - so reliable operation requires derating based on target output stage.

How does the master reset (MR) interact with the clock input (CP)?

The MR input is asynchronous and active HIGH: asserting MR immediately forces Q0–Q11 LOW, irrespective of CP state or transition. No setup/hold timing relative to CP is required. When MR returns LOW, the counter resumes from zero on the next CP falling edge - there is no metastability risk because reset overrides all internal flip-flop states directly.

Can the 74HCT4040DB-Q100 be used with a 3.3 V microcontroller output as clock source?

No - the 74HCT4040DB-Q100 requires TTL-level inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V). A 3.3 V MCU GPIO may not guarantee sufficient noise margin: its VOH (typically 3.0–3.3 V) falls near the 74HCT's VIH threshold, risking marginal triggering. Use a level shifter or select 74HC4040BQ-Q100 for guaranteed 3.3 V compatibility.

Why does the DHVQFN package include two GND pins (pins 1 and 14)?

Pins 1 and 14 are separate GND terminals to minimize ground loop inductance and reduce simultaneous switching noise. Pin 1 connects to the primary ground plane under the package; pin 14 provides a dedicated return path for output switching currents. Both must be connected to the same low-impedance GND plane - splitting them degrades EMI performance and increases propagation delay variation.