Nexperia USA Inc. 74HCT4040PW,118

Overview

74HCT4040PW,118 from Nexperia is a 12-stage asynchronous binary ripple counter IC with TTL-compatible inputs, operating from 4.5 V to 5.5 V, delivering Q0–Q11 outputs on HIGH-to-LOW clock transitions and featuring an active-HIGH asynchronous master reset (MR). It supports frequency division by up to 4096 and is rated for operation from −40 °C to +125 °C in TSSOP16 packaging. Used in timing control circuits requiring precise cascaded division.

For engineers reviewing the 74HCT4040PW,118 datasheet, 74HCT4040PW,118 pinout, 74HCT4040PW,118 application, or 74HCT4040PW,118 equivalent, key selection criteria include its 12-bit ripple architecture, TTL-level input compatibility, propagation delay ≤60 ns at 4.5 V, MR-to-Qn timing ≤68 ns, and guaranteed operation across industrial and extended temperature ranges.

Technical Context

This device implements a cascaded chain of 12 static toggle flip-flops, where each stage divides its input by two. The counter advances solely on the HIGH-to-LOW edge of CP, with no internal synchronization - resulting in inherent ripple propagation delay between stages (e.g., Qn to Qn+1 ≤30 ns at 4.5 V).

MR asserts asynchronously and forces all Q outputs LOW regardless of CP state. Inputs feature clamp diodes enabling safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Output drive capability is ±4 mA at VCC = 4.5 V, with VOL ≤0.4 V and VOH ≥3.7 V under load.

Key Specifications

Pinout & Package

TSSOP16 package (SOT403-1): 4.4 mm body width, 0.65 mm lead pitch, 16-terminal surface-mount plastic thin shrink small outline package rated for −40 °C to +125 °C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4040PW,118 and SN74LV4040APWR, the 74HCT4040PW,118 uniquely bridges legacy 5 V TTL systems and modern mixed-signal boards via its strict TTL input thresholds and robust 4.5–5.5 V operation - making it irreplaceable where signal integrity with older microcontrollers or bus transceivers is mandatory.

Availability

74HCT4040PW,118 is available at Aetrix Electronics and suitable for frequency division, time delay generation, control counting, and LED blink sequencing requiring stable component supply across automotive, industrial, and communications equipment lifecycles.

Supply support for 74HCT4040PW,118 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 focused on essential efficiency technologies, delivering high-performance, reliable standard products including logic, discretes, MOSFETs, and ESD protection devices.

The 74HCT4040 belongs to Nexperia's 74HCT logic family - engineered for seamless integration into 5 V TTL-based digital systems while maintaining CMOS power efficiency and industrial temperature resilience.

FAQ

What is the maximum clock frequency supported by the 74HCT4040PW,118?

The 74HCT4040PW,118 supports a maximum clock frequency of 72 MHz at VCC = 4.5 V with CL = 15 pF, as specified in Table 7 of the Nexperia datasheet Rev. 8. At 5.0 V and CL = 15 pF, fmax rises to 79 MHz. These values assume proper PCB layout, local decoupling, and load capacitance within specification.

Can the 74HCT4040PW,118 be operated at 3.3 V supply?

No - the 74HCT4040PW,118 is specified only for 4.5 V to 5.5 V operation per Table 5. At 3.3 V, VIH and VIL thresholds fall outside TTL compatibility, and static/dynamic parameters are not guaranteed. For 3.3 V systems, use SN74LV4040APWR or 74LVC4040PW instead.

Is the master reset (MR) synchronous or asynchronous?

The MR input is fully asynchronous: asserting MR HIGH immediately forces all Q0–Q11 outputs LOW, regardless of CP state or timing. This behavior is confirmed in Section 7.1 Function Table and Figure 5 timing diagram, where MR overrides ongoing counting without waiting for the next clock edge.

Does the 74HCT4040PW,118 require external pull-up or pull-down resistors on unused inputs?

No - all inputs (CP and MR) have internal clamp diodes and defined logic thresholds. Unused inputs must be tied HIGH or LOW to prevent floating states that cause increased ICC and potential oscillation. Per Section 1 of the datasheet, "Inputs include clamp diodes" but do not eliminate the need for definite DC biasing of unterminated pins.