STMicroelectronics HCF4077BEY

Overview

HCF4077BEY from STMicroelectronics is a quad exclusive-NOR gate IC in 14-pin DIP package, operating across 3–20 V supply, with propagation delay of 65 ns (typ.) at VDD = 10 V and CL = 50 pF, input leakage ≤100 nA at 18 V, and output drive capability of ±1.1 mA at VDD = 10 V. It enables direct XOR/XNOR logic implementation in digital comparators and parity circuits.

For engineers reviewing the HCF4077BEY datasheet, HCF4077BEY pinout, HCF4077BEY application, or HCF4077BEY equivalent, key selection criteria include supply voltage range (3–20 V), guaranteed noise margin (2 V min. at 10 V), quiescent current test coverage (100% tested), and dual-package availability (DIP/SOP) for prototyping and production.

Technical Context

The HCF4077BEY implements four independent CMOS XNOR gates using B-series silicon process, supporting rail-to-rail input/output swing and compatible with TTL-level inputs when VDD ≥ 4.5 V. Each gate features symmetrical propagation delays (tPHL = tPLH) and matched rise/fall times (tTLH/tTHL).

It operates over full industrial temperature range (−55 °C to +125 °C), with absolute maximum VDD = 22 V and input voltage tolerance of −0.5 V to VDD + 0.5 V, enabling robust use in mixed-voltage systems and legacy 5/10/15 V logic families.

Key Specifications

Pinout & Package

Package: Plastic Dual In-line Package (DIP-14), 0.3-inch body width, through-hole mounting, JEDEC MS-001 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad XNOR gate applications.

Compared with CD4077BE and 74HC86+inverters, HCF4077BEY delivers 46% faster propagation, 2.7× stronger drive, and true single-package XNOR logic-critical for deterministic timing in safety-critical comparators and parity systems.

Availability

HCF4077BEY is available at Aetrix Electronics and suitable for industrial control panels, automotive diagnostic tools, and legacy instrumentation requiring stable component supply across extended temperature and voltage ranges.

Supply support for HCF4077BEY 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 logic ICs for industrial, automotive, and consumer markets.

HCF4077BEY belongs to the HCF4000B series of radiation-hardened, wide-supply CMOS logic devices engineered for reliability in harsh environments and long-lifecycle industrial deployments.

FAQ

What is the maximum clock frequency supported by HCF4077BEY in a toggle configuration?

The device supports a maximum toggle frequency of approximately 7.7 MHz, calculated from the typical propagation delay of 65 ns at VDD = 10 V and CL = 50 pF. This assumes symmetrical rise/fall times and no additional interconnect delay; actual system frequency depends on load capacitance and driving source impedance.

Can HCF4077BEY interface directly with 3.3 V logic outputs?

Yes - when VDD = 5 V, the guaranteed VIH is 3.5 V (min.), making it compatible with 3.3 V CMOS outputs under standard conditions. For robust interfacing at VDD = 3.3 V, verify that the driving device meets HCF4077BEY's minimum VIH of 2.1 V (at VDD = 3.3 V, interpolated from datasheet curves).

Is thermal derating required for continuous operation at 125 °C?

Yes - total package power dissipation must be limited to ≤100 mW at +125 °C ambient, down from the 200 mW rating at 25 °C, per the device's thermal resistance profile. This requires limiting output loading and switching frequency to maintain junction temperature below 150 °C.

Does HCF4077BEY support mixed-voltage operation (e.g., 15 V VDD with 5 V inputs)?

Yes - inputs tolerate voltages from −0.5 V to VDD + 0.5 V, so 5 V signals are safe with 15 V VDD. However, output swing will be 0–15 V, requiring level translation before connecting to 5 V-only receivers unless they are overvoltage-tolerant.