STMicroelectronics HCF4024BEY

Overview

HCF4024BEY from STMicroelectronics is a 7-stage ripple-carry binary counter IC implemented with master-slave flip-flops, operating across 3–20 V supply, delivering tPD = 80 ns (typ.) at VDD = 10 V, with Schmitt-trigger clock input enabling unlimited rise/fall times, and common asynchronous RESET for full-zero initialization - used in frequency division and timing control within industrial timer modules and digital logic sequencers.

For engineers reviewing the HCF4024BEY datasheet, HCF4024BEY pinout, HCF4024BEY application, or HCF4024BEY equivalent, key selection criteria include its rail-to-rail supply range (3–20 V), buffered symmetrical outputs, guaranteed quiescent current ≤3000 µA at 20 V, and verified operation from –55 °C to +125 °C for harsh-environment embedded counters.

Technical Context

The HCF4024BEY implements a cascaded 7-bit binary counter where each stage advances on the falling edge of the Φ input; all outputs Q1–Q7 are buffered and exhibit standardized symmetrical VOH/VOL (e.g., VOH ≥ 9.95 V at VDD = 10 V, VOL ≤ 0.05 V). Reset is asynchronous and active-high, forcing all outputs low regardless of clock state.

Its Schmitt-trigger input ensures noise immunity with hysteresis ≥2 V (at VDD = 10 V), and propagation delay scales predictably with supply voltage (tPLH/tPHL = 160 ns max at VDD = 5 V, 80 ns typ. at 10 V, 65 ns typ. at 15 V), supporting stable multi-voltage system integration.

Key Specifications

Pinout & Package

Supplied in 14-pin plastic DIP (Dual In-line Package) with 2.54 mm pitch; body width 7.1 mm, height 3.3 mm, lead length 3.3 mm - compatible with standard through-hole PCB assembly and socketing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD4024BE and MC14024BDR2G, the HCF4024BEY offers superior high-temperature stability (up to +125 °C), faster typical propagation (80 ns vs. 120 ns), and JEDEC-compliant B-series assurance - making it optimal for automotive and industrial control where reliability trumps marginal cost savings.

Availability

HCF4024BEY is available at Aetrix Electronics and suitable for industrial timer modules, automotive body control units, and legacy instrument cluster drivers requiring stable component supply across extended temperature and voltage ranges.

Supply support for HCF4024BEY 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, MCU, power, and discrete devices for industrial, automotive, and consumer markets.

The HCF4024BEY belongs to ST's legacy HCF4000B series of radiation-hardened, high-voltage CMOS logic ICs - engineered specifically for robust timing, counting, and control functions in electrically noisy and thermally demanding environments.

FAQ

Is the HCF4024BEY pin-compatible with the CD4024BE?

Yes - both use identical 14-pin DIP pinout with matching Φ, RESET, Q1–Q7, VDD, and VSS assignments. NC pins align at positions 8, 10, and 13. No PCB redesign is needed for drop-in replacement, though timing and temperature performance differ.

What is the maximum clock frequency supported at VDD = 5 V?

At VDD = 5 V, the HCF4024BEY supports up to 7 MHz maximum clock frequency (fmax), with guaranteed minimum input pulse width of 70 ns and propagation delay of 180 ns (typ.) from Φ to Q1 - verified per JEDEC JESD13B test conditions.

Can the RESET pin be driven by an open-drain microcontroller GPIO?

Yes - the RESET input has CMOS-compatible threshold (VIL ≤ 1.5 V, VIH ≥ 3.5 V at VDD = 5 V) and draws ≤100 nA leakage. An external pull-up resistor (e.g., 10 kΩ to VDD) ensures valid HIGH state when GPIO is high-impedance, satisfying the required active-high assertion.

Does the HCF4024BEY require external bypass capacitors?

Yes - a 100 nF ceramic capacitor between VDD and VSS, placed within 5 mm of pins 14 and 7, is mandatory to suppress switching noise and prevent output oscillation, especially at higher frequencies (>1 MHz) or under heavy capacitive loading.