STMicroelectronics HCF4040BEY

Overview

HCF4040BEY from STMicroelectronics is a 12-stage ripple-carry binary counter IC in 16-pin DIP package, featuring buffered CMOS inputs/outputs, common asynchronous RESET, Schmitt-trigger clock input (Φ), and operation across 3–20 V supply. It advances on negative clock edge, delivers 80 ns typical propagation delay at 10 V, and supports up to 16 MHz max clock frequency at VDD = 10 V. Used in digital timing, frequency division, and event counting circuits.

For engineers reviewing the HCF4040BEY datasheet, HCF4040BEY pinout, HCF4040BEY application, or HCF4040BEY equivalent, key selection factors include its 12-bit binary count depth, rail-to-rail output swing, wide VDD range (3–20 V), Schmitt-trigger noise immunity on Φ, and guaranteed quiescent current ≤300 µA at 10 V over temperature.

Technical Context

The HCF4040BEY implements a synchronous-reset-free, master-slave flip-flop-based ripple counter with no internal carry lookahead-propagation delay accumulates across stages (e.g., Q1→Q2: 40 ns typ. @10 V). Its Schmitt-trigger input on pin 10 enables robust clocking with unlimited rise/fall times, critical for noisy industrial environments.

All 12 outputs (Q1–Q12) are fully buffered, delivering symmetrical VOH/VOL (≥9.95 V / ≤0.05 V @10 V) and ±1.1 mA drive capability. RESET (pin 11) is active-high asynchronous, forcing all outputs low regardless of clock state-a hard reset essential for system initialization and fault recovery.

Key Specifications

Pinout & Package

Package: 16-pin plastic dual in-line package (DIP-16), 0.3-inch body width, through-hole mounting. Pin pitch: 2.54 mm (0.1 inch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4040BE and MC14040BDR2G, the HCF4040BEY offers superior noise immunity (Schmitt input), wider temperature rating (−55°C to +125°C), and tighter quiescent current control-making it optimal for ruggedized timing in instrumentation and control systems.

Availability

HCF4040BEY is available at Aetrix Electronics and suitable for industrial timer modules, digital panel meters, power supply sequencers, and legacy equipment interface adapters requiring stable component supply and long-term obsolescence support.

Supply support for HCF4040BEY 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The HCF4040BEY belongs to ST's legacy high-voltage CMOS logic family, engineered specifically for robust, wide-supply-range digital timing in industrial control, test equipment, and retrofit applications.

FAQ

What is the maximum operating voltage for HCF4040BEY?

The HCF4040BEY supports a recommended operating supply voltage from 3 V to 20 V DC, with absolute maximum rating of −0.5 V to +22 V on VDD relative to VSS. Operation above 20 V risks exceeding safe power dissipation limits and is not guaranteed per specification.

Does HCF4040BEY require an external pull-up resistor on the RESET pin?

No. The RESET input is active-high CMOS-compatible and internally biased; it requires only a clean logic HIGH (≥VDD × 0.7) to assert reset. External pull-up is unnecessary unless interfacing with open-drain or mechanical switch sources where debouncing or default-high bias is needed.

Can HCF4040BEY drive LEDs directly from its Q outputs?

Yes-each Q output can sink or source up to ±1.1 mA @10 V, sufficient to illuminate low-current indicator LEDs (e.g., 2 mA @2 V drop) with appropriate series resistors. For higher-brightness or multiplexed displays, external transistor buffering is recommended to avoid output voltage droop.

Is HCF4040BEY still in active production?

While marked "Obsolete Product(s)" in the provided documentation, HCF4040BEY remains available through authorized STMicroelectronics distributors and Aetrix Electronics' extended-life inventory program, with full traceability and guaranteed form-fit-function compliance for legacy design refresh and repair.