Nexperia USA Inc. 74HC4040BQ-Q100X

Overview

74HC4040BQ-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 2.0 V to 6.0 V across –40 °C to +125 °C and delivers 98 MHz maximum clock frequency at VCC = 6.0 V. Used in automotive timing control and frequency division circuits requiring high noise immunity and latch-up robustness.

For engineers reviewing the 74HC4040BQ-Q100 datasheet, 74HC4040BQ-Q100 pinout, 74HC4040BQ-Q100 application, or 74HC4040BQ-Q100 equivalent, this device serves as a low-power, automotive-grade ripple counter where precise cascaded timing, deterministic reset behavior, and CMOS-level input compatibility are required - especially in engine control modules, body electronics timers, and infotainment system clock dividers.

Technical Context

This device implements a synchronous-cascade-free 12-bit binary counter using twelve static toggle flip-flops, each advancing only upon the falling edge of its preceding stage's output - resulting in inherent ripple propagation delay. Its asynchronous MR input forces all Q outputs LOW independently of CP state, enabling immediate global reset without clock dependency.

Input clamp diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. The DHVQFN16 package (SOT763-1) features side-wettable flanks for AOI-compatible solder joint inspection and thermal enhancement suitable for under-hood automotive environments.

Key Specifications

Pinout & Package

DHVQFN16 package (SOT763-1): 2.5 × 3.5 × 0.85 mm body, no leads, 16 terminals, side-wettable flanks for automated optical inspection. Exposed thermal pad (terminal 1 index area) may be left floating or connected to GND per layout requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT4040BQ-Q100, the HC variant gives higher noise immunity in 3.3 V domains, while SN74LV4040APWR trades automotive reliability for broader voltage flexibility and lower cost - making it unsuitable for safety-critical vehicle subsystems.

Availability

74HC4040BQ-Q100 is available at Aetrix Electronics and suitable for engine control units, body control modules, and infotainment systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HC4040BQ-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 74HC4040BQ-Q100 belongs to Nexperia's automotive-qualified HC logic family, designed specifically for timing-critical automotive subsystems requiring robustness against voltage transients, thermal stress, and electromagnetic interference.

FAQ

What is the maximum allowable clock frequency for reliable operation at 125 °C ambient?

At Tamb = +125 °C and VCC = 6.0 V, the maximum guaranteed clock frequency is 24 MHz per Table 7 - derived from worst-case propagation delay (38 ns CP→Q0) and cumulative ripple delay across 12 stages. Operation above this limit risks metastability or missed toggles due to accumulated timing skew.

Can the MR pin be driven by an open-drain microcontroller GPIO without a pull-up resistor?

No. MR is active-HIGH and lacks an internal pull-up; driving it open-drain without external pull-up risks indeterminate reset state during power-up or MCU reset. A 10 kΩ external pull-down is recommended if MR must remain inactive by default, or a pull-up if reset-on-power-up is required.

Does the DHVQFN16 package require solder paste on the exposed thermal pad?

The exposed pad (terminal 1 index area) has no electrical requirement for soldering. If soldered, it must remain electrically floating or be connected to GND - never to VCC or signal nets. Thermal performance improvement is marginal; mechanical anchoring is the primary benefit.

How does input clamping diode protection affect interfacing with 12 V wake-up signals?

Clamp diodes allow safe connection of 12 V signals via a series current-limiting resistor (e.g., 10 kΩ), limiting IIK to ±20 mA per JESD78. At 12 V, this yields ~1 mA forward current into the VCC rail - requiring adequate VCC decoupling to absorb transient energy without rail collapse.