NXP Semiconductors 74HCT4040DB,112

Overview

74HCT4040DB,112 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 qualified for industrial temperature range (−40 °C to +125 °C) in SSOP16 package. Used in frequency division and timing control circuits where low-power CMOS logic meets legacy TTL signal levels.

For engineers reviewing the 74HCT4040DB,112 datasheet, 74HCT4040DB,112 pinout, 74HCT4040DB,112 application, or 74HCT4040DB,112 equivalent, key selection considerations include its TTL-level input compatibility, 12-bit ripple architecture, propagation delay consistency across stages (10–20 ns Qn→Qn+1 at 4.5 V), MR-to-Qn timing (23–68 ns), and SSOP16 thermal performance under sustained clock loads.

Technical Context

This device implements a cascaded chain of 12 static toggle flip-flops, advancing only on the HIGH-to-LOW transition of the CP input. Its asynchronous MR input forces all Q outputs LOW independently of CP state, enabling immediate counter reset without clock synchronization.

The 74HCT4040DB,112 uses buffered complementary MOS (CMOS) output stages with rail-to-rail swing and TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), ensuring interoperability with legacy 5 V TTL systems while maintaining CMOS power efficiency and noise immunity.

Key Specifications

Pinout & Package

74HCT4040DB,112 is housed in a 16-lead SSOP (Shrink Small Outline Package), SOT338-1, with 0.65 mm lead pitch and body dimensions 4.4 × 5.3 × 1.8 mm. Pin 1 is marked by a notch or dot; leads are gull-wing shaped for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC4040DB,112 and SN74LV4040APWR, the 74HCT4040DB,112 uniquely bridges legacy 5 V TTL signal integrity and modern CMOS power efficiency - making it the only choice when retrofitting TTL-driven equipment with low-power counting functionality.

Availability

74HCT4040DB,112 is available at Aetrix Electronics and suitable for frequency division, time-delay generation, control sequence logic, and event counting applications requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.

Supply support for 74HCT4040DB,112 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 semiconductors, delivering high-performance, reliable components for automotive, industrial, mobile, and computing markets.

The 74HCT4040DB,112 belongs to Nexperia's 74HCT logic family - engineered specifically for seamless integration between legacy TTL systems and energy-efficient CMOS circuitry in industrial control and instrumentation applications.

FAQ

What is the maximum clock frequency supported by the 74HCT4040DB,112?

The 74HCT4040DB,112 supports a maximum clock frequency of 72 MHz at VCC = 4.5 V and CL = 50 pF, as specified in Table 7 of the Nexperia datasheet Rev. 8. This value decreases to 60 MHz at VCC = 4.5 V with CL = 15 pF due to reduced capacitive loading. The limiting factor is the cumulative propagation delay across 12 ripple stages, not the first-stage CP→Q0 delay alone.

Can the 74HCT4040DB,112 be used with a 3.3 V supply?

No - the 74HCT4040DB,112 is not rated for 3.3 V operation. Its recommended supply range is strictly 4.5 V to 5.5 V, per Table 5. At 3.3 V, input thresholds (VIH ≥ 2.0 V) may still be met, but output drive strength, timing margins, and DC parameters fall outside specification. For 3.3 V systems, use the 74LV4040 or 74AHC4040 variants instead.

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

The MR input is fully asynchronous and overrides all clock activity: when MR is HIGH, all Q0–Q11 outputs force LOW immediately, independent of CP state or transitions. No clock edge is required for reset execution. Once MR returns LOW, the next CP falling edge resumes counting from zero - there is no metastability or race condition between MR deassertion and CP arrival.

Is the 74HCT4040DB,112 pin-compatible with other 74xx4040 variants in SSOP16?

Yes - the 74HCT4040DB,112 shares identical pinout (SOT338-1) with 74HC4040DB,112 and earlier 74HCT4040 variants in the same package. All 16 pins map identically per Table 2: MR (1), Q0 (2), Q1 (3), ..., VCC (16). However, electrical behavior differs: HCT offers TTL input compatibility, while HC requires CMOS-level inputs - direct substitution affects signal integrity if driving sources are mismatched.