Nexperia USA Inc. 74HCT4040D,653

Overview

74HCT4040D,653 from Nexperia is a 12-stage asynchronous binary ripple counter IC with TTL-compatible inputs, operating from 4.5 V to 5.5 V, featuring a HIGH-to-LOW clock edge trigger, active-HIGH asynchronous master reset (MR), and twelve buffered Q0–Q11 outputs. It delivers 72 MHz maximum clock frequency at VCC = 4.5 V and CL = 50 pF, and is rated for operation from −40 °C to +125 °C in SO16 (SOT109-1) package. It is used in digital timing control circuits requiring precise frequency division by powers of two.

For engineers reviewing the 74HCT4040D,653 datasheet, 74HCT4040D,653 pinout, 74HCT4040D,653 application, or 74HCT4040D,653 equivalent, key selection considerations include its TTL-level input compatibility, 12-bit ripple architecture, propagation delay consistency across stages (e.g., Qn→Qn+1 = 10–25 ns at 4.5 V), thermal stability over extended temperature range, and SO16 package suitability for industrial PCB layouts with legacy footprint support.

Technical Context

This device implements a cascaded chain of 12 static toggle flip-flops, where each stage divides the incoming clock by two, resulting in cumulative division ratios up to 2¹² = 4096. The counter advances only on the HIGH-to-LOW transition of CP, and MR forces all outputs LOW asynchronously-bypassing clock dependency.

Its TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure direct interfacing with legacy 5 V logic families, while its CMOS output structure provides rail-to-rail swing (VOH ≥ 3.98 V, VOL ≤ 0.26 V at IO = ±4 mA) and low quiescent supply current (ICC ≤ 8 μA typical).

Key Specifications

Pinout & Package

74HCT4040D,653 is housed in a plastic small outline package (SO16, SOT109-1) with 16 leads, 3.9 mm body width, and standard JEDEC MS-012 footprint. Pin 1 is marked by a notch or dot; the package is RoHS-compliant and rated for reflow soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4040D,653 and SN74LV4040APWR, the 74HCT4040D,653 uniquely bridges legacy 5 V TTL logic domains without level shifters while maintaining industrial temperature resilience and SO16 footprint compatibility-making it optimal for retrofitting or upgrading existing 5 V control boards.

Availability

74HCT4040D,653 is available at Aetrix Electronics and suitable for frequency division, time delay generation, control sequencing, and digital logic timing applications requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.

Supply support for 74HCT4040D,653 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 delivering high-performance, reliable discrete, logic, and MOSFET solutions with emphasis on efficiency, miniaturization, and robustness for industrial, automotive, and computing markets.

The 74HCT4040 belongs to Nexperia's 74HCT logic family, engineered specifically for seamless integration between legacy TTL systems and modern CMOS-based designs-prioritizing input compatibility, thermal stability, and long-term manufacturability in harsh environments.

FAQ

What is the maximum clock frequency supported by the 74HCT4040D,653?

The 74HCT4040D,653 supports a maximum clock frequency of 72 MHz at VCC = 4.5 V and CL = 50 pF over the full −40 °C to +125 °C operating range. At VCC = 5.0 V and CL = 15 pF, it achieves up to 79 MHz. These values are measured from CP input to Q0 output and assume proper signal integrity, decoupling, and load conditions per the datasheet test circuit.

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

The MR input operates asynchronously and independently of CP: a HIGH on MR immediately forces all Q0–Q11 outputs LOW, regardless of CP state, edge timing, or current count value. No clock edge is required for reset action, and the counter remains held in reset until MR returns LOW, after which the next HIGH-to-LOW CP transition resumes counting from zero.

Can the 74HCT4040D,653 be used with a 3.3 V supply?

No-the 74HCT4040D,653 is specified only for VCC = 4.5 V to 5.5 V. Its TTL-compatible input thresholds require ≥2.0 V VIH, which cannot be reliably met with a 3.3 V supply. For 3.3 V systems, use the pin-compatible 74LVC4040 or 74LV4040, which feature LV logic thresholds and 3.3 V-rated operation.

Why does propagation delay increase from Q0 to Q11 in ripple counter operation?

Ripple counters propagate clock edges sequentially through each flip-flop stage, so Q11 experiences cumulative delay equal to the sum of 12 individual stage delays. At VCC = 4.5 V, CP→Q0 is ~19 ns, while Q10→Q11 adds ~10–20 ns per stage, resulting in total CP→Q11 delay exceeding 200 ns. This inherent skew limits maximum usable frequency in applications requiring simultaneous multi-bit sampling.