Nexperia USA Inc. 74HCT4040D-Q100J

Overview

74HCT4040D-Q100 from Nexperia is an AEC-Q100 Grade 1 qualified 12-stage binary ripple counter with asynchronous master reset (MR), clock input (CP) triggering on HIGH-to-LOW transitions, and twelve buffered Q0–Q11 outputs. It operates from 4.5 V to 5.5 V across –40 °C to +125 °C, delivers ≤60 ns CP-to-Q0 propagation delay at VCC = 4.5 V, and supports automotive timing, frequency division, and control counting applications.

For engineers reviewing the 74HCT4040D-Q100 datasheet, 74HCT4040D-Q100 pinout, 74HCT4040D-Q100 application, or 74HCT4040D-Q100 equivalent, this device serves as a TTL-level–compatible, high-noise-immunity ripple counter for automotive-grade clock division, time-delay generation, and sequential state tracking where latch-up immunity (>100 mA) and HBM ESD robustness (>2000 V) are required.

Technical Context

This device implements a cascaded chain of twelve static toggle flip-flops, each advancing only upon the falling edge of the preceding stage's output-resulting in inherent ripple propagation delay between Qn and Qn+1. Its asynchronous MR input forces all outputs LOW independently of CP timing, enabling deterministic reset without clock synchronization.

The 74HCT variant features TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), ensuring direct interfacing with legacy 5 V logic families. Input clamp diodes allow safe operation with current-limiting resistors when driven from voltages exceeding VCC.

Key Specifications

Pinout & Package

74HCT4040D-Q100 uses the SO16 (SOT109-1) package: plastic small outline, 16-pin, 3.9 mm body width, 1.27 mm lead pitch. Pin 1 index located at top-left corner with notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4040D-Q100 and SN74LV4040APWR, the 74HCT4040D-Q100 uniquely balances automotive qualification, TTL compatibility, and 5 V system integration-making it the only choice for AEC-compliant designs interfacing legacy 5 V logic without level translation.

Availability

74HCT4040D-Q100 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, body control units, and consumer appliance power sequencers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT4040D-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, high-reliability logic, analog, and discrete components for automotive, industrial, and consumer markets.

The 74HCT4040-Q100 belongs to Nexperia's automotive-qualified logic portfolio, designed specifically to meet stringent AEC-Q100 Grade 1 requirements for under-hood and safety-critical timing applications.

FAQ

What is the maximum clock frequency supported by the 74HCT4040D-Q100?

The maximum clock frequency is 72 MHz at VCC = 4.5 V and Tamb = 25 °C, decreasing to 24 MHz at –40 °C to +125 °C operating range. This limit is defined by the CP-to-Q0 propagation delay (60 ns max) and accounts for cumulative ripple delay across all 12 stages. Exceeding this frequency risks missed counts due to insufficient setup/hold margins at downstream stages.

Can the 74HCT4040D-Q100 be used with a 3.3 V microcontroller output as the clock source?

No - the 74HCT4040D-Q100 requires a minimum VIH of 2.0 V, but its input threshold is optimized for 5 V TTL levels. A 3.3 V logic HIGH may fall below guaranteed recognition at temperature extremes or with trace loading. Use a level shifter or select the 74HC4040D-Q100 variant, which accepts CMOS-level inputs down to 30% of VCC.

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

The MR pin is active-HIGH and overrides all clock activity. During power-up, if MR is held HIGH until VCC stabilizes above 4.5 V, the counter initializes to zero with all Q outputs LOW. To ensure deterministic startup, tie MR to a power-on reset (POR) circuit or microcontroller GPIO that asserts HIGH for ≥100 ns after VCC reaches regulation.

Is the SO16 package (SOT109-1) compatible with standard reflow profiles for lead-free soldering?

Yes - the SO16 package is qualified for IPC/JEDEC J-STD-020 moisture sensitivity level 1 (MSL1) and supports peak reflow temperatures up to 260 °C. Standard lead-free reflow profiles with ramp rates ≤3 °C/s, soak at 150–200 °C for 60–120 s, and peak at 235–245 °C for 40–80 s are appropriate. Ensure board layout includes thermal relief on GND/VCC pads to prevent tombstoning.