NXP Semiconductors 74HCT4040D,652

Overview

74HCT4040D,652 from Nexperia is a 12-stage asynchronous binary ripple counter IC with TTL-compatible inputs, 16-pin SO16 package, operating from 4.5 V to 5.5 V, delivering up to 72 MHz maximum clock frequency at VCC = 4.5 V and CL = 50 pF, used in frequency division and timing control circuits for industrial instrumentation and digital logic systems.

For engineers reviewing the 74HCT4040D,652 datasheet, 74HCT4040D,652 pinout, 74HCT4040D,652 application, or 74HCT4040D,652 equivalent, key selection criteria include its HIGH-to-LOW edge-triggered clock input (CP), active-HIGH asynchronous master reset (MR), twelve independent Q0–Q11 outputs, guaranteed operation from –40 °C to +125 °C, and compatibility with standard TTL logic levels.

Technical Context

This device implements a cascaded chain of twelve static toggle flip-flops, advancing on each HIGH-to-LOW transition of CP. Its ripple architecture inherently introduces cumulative propagation delay across stages-e.g., 19 ns (typ) from CP to Q0 and 10 ns (typ) between adjacent outputs at VCC = 4.5 V-making it unsuitable for synchronous high-speed counting but ideal for low-jitter divide-by-N applications where output phase alignment is not required.

The MR input forces all Q outputs LOW asynchronously and independently of CP state, enabling deterministic system initialization. Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors, and the device meets JESD7A (2.0 V–6.0 V) and JESD8C (2.7 V–3.6 V) standards, with HBM ESD rating >2000 V and CDM >1000 V.

Key Specifications

Pinout & Package

74HCT4040D,652 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads, 3.9 mm body width, and gull-wing surface-mount terminals. Pin 1 is marked by a notch or index area on the package top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4040D,652 and SN74LV4040APWR, the 74HCT4040D,652 uniquely bridges legacy 5 V TTL systems and modern CMOS loads, offering deterministic reset behavior and guaranteed 125 °C operation - making it optimal for industrial control panels where interoperability and thermal resilience outweigh ultra-low power needs.

Availability

74HCT4040D,652 is available at Aetrix Electronics and suitable for frequency division, time delay generation, control sequencing, and LED blink rate control requiring stable component supply across automotive under-hood, industrial automation, and instrumentation applications.

Supply support for 74HCT4040D,652 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-volume, high-reliability logic, analog, and discrete components, with manufacturing rooted in process technology leadership and automotive-grade quality systems.

The 74HCT4040 belongs to Nexperia's industry-standard logic portfolio, designed specifically for robust, drop-in replacement of legacy 74-series TTL and CMOS counters in industrial control, power management, and timing-critical embedded subsystems.

FAQ

What is the maximum clock frequency supported by 74HCT4040D,652?

The 74HCT4040D,652 supports a maximum clock frequency of 72 MHz at VCC = 4.5 V and CL = 50 pF, as specified in Table 7 of the datasheet. This value decreases to 60 MHz at VCC = 5.0 V and further to 24 MHz at the full –40 °C to +125 °C temperature range due to increased propagation delay. Operation above these limits risks metastability or missed counts.

Can 74HCT4040D,652 be used with a 3.3 V microcontroller output?

No - the 74HCT4040D,652 requires a minimum VIH of 2.0 V at VCC = 5 V, but its input thresholds are optimized for 5 V TTL. A 3.3 V GPIO may not reliably exceed VIH (2.0 V) with sufficient noise margin, especially over temperature. Use 74LVC4040 or level-shifting circuitry instead for 3.3 V drive.

How does the master reset (MR) behave during clock activity?

The MR input is asynchronous and active-HIGH: asserting MR immediately forces all Q0–Q11 outputs LOW, regardless of CP state or timing. The counter remains held in reset until MR returns LOW, after which the next CP falling edge initiates counting from zero - no setup/hold timing relative to CP is required.

Is there a recommended decoupling capacitor for 74HCT4040D,652?

Yes - place a 100 nF X7R ceramic capacitor between VCC (pin 16) and GND (pin 8), located within 5 mm of the SO16 package. This suppresses switching noise generated during output transitions, particularly critical for maintaining noise immunity on the MR and CP lines in noisy industrial environments.