onsemi MC74HC4075N

Overview

MC74HC4075N from ON Semiconductor (formerly Motorola) is a triple 3-input OR gate in high-performance silicon-gate CMOS technology, pin-compatible with MC14075B. It operates from 2 V to 6 V, delivers ±25 mA output drive per pin, supports 10 LSTTL loads, and features low input current (≤1 µA) and high noise immunity. It is used in digital logic interfacing, bus arbitration, and discrete combinational control circuits.

For engineers reviewing the MC74HC4075N datasheet, pinout, applications, or equivalent options, this page provides verified functional specifications, package mapping, real-world use scenarios, and validated alternative options for industrial and embedded logic design.

Technical Context

The MC74HC4075N implements three independent 3-input OR gates (Y = A + B + C) using standard CMOS logic architecture. Each gate exhibits rail-to-rail output swing, with VOH ≥ 5.9 V and VOL ≤ 0.1 V at VCC = 6.0 V under light load (20 µA).

It supports mixed-voltage interfacing: inputs are compatible with standard CMOS outputs and-when pulled up-LSTTL outputs. Propagation delay ranges from 20 ns (VCC = 6.0 V) to 175 ns (VCC = 2.0 V, TA = 125°C), with output transition time ≤19 ns under same conditions.

Key Specifications

Pinout & Package

MC74HC4075N is supplied in a 14-pin plastic dual in-line package (PDIP), case 646–06, with 0.3-inch body width and through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triple 3-input OR gate applications.

Compared with MC74HC4075N, SN74HC4075N offers improved output drive consistency at mid-supply voltages, while CD74HC4075E adds military-grade screening options-neither is pin-compatible in terms of full temperature or reliability certification scope, but all three share identical logic behavior and PCB footprint.

Availability

MC74HC4075N is available at Aetrix Electronics and suitable for industrial control logic, power sequencing monitors, and digital test fixture applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC74HC4075N 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

ON Semiconductor is a global semiconductor supplier delivering energy-efficient, high-performance silicon solutions for automotive, industrial, cloud computing, medical, and IoT applications.

The MC74HC4075N belongs to the HC (High-Speed CMOS) logic family, designed for pin-compatible upgrades from older TTL and CD4000-series devices while delivering lower power consumption and higher noise immunity in industrial and embedded systems.

FAQ

What logic family does the MC74HC4075N belong to, and how does it differ from the original 74LS4075?

The MC74HC4075N belongs to the 74HC (High-Speed CMOS) logic family. Unlike the bipolar 74LS4075, it uses silicon-gate CMOS technology, resulting in significantly lower static power consumption (µA vs. mA), wider supply range (2–6 V vs. 4.75–5.25 V), higher noise immunity, and rail-to-rail output swing. The MC74HC4075N maintains identical pinout and logic function to enable drop-in replacement where voltage and speed requirements align.

Can the MC74HC4075N operate reliably at 3.3 V, and what are its output voltage levels at that supply?

Yes, the MC74HC4075N is fully specified for operation at 3.3 V. At VCC = 3.3 V and TA = 25°C, VOH is guaranteed ≥3.15 V (with |Iout| ≤ 20 µA) and ≥2.9 V (with |Iout| ≤ 4.0 mA); VOL is guaranteed ≤0.1 V (light load) and ≤0.33 V (4.0 mA sink). These levels ensure robust interfacing with 3.3 V CMOS and LVTTL inputs.

Is the MC74HC4075N pin-compatible with the MC14075B, and what does that mean for legacy designs?

Yes, the MC74HC4075N is explicitly stated to be identical in pinout to the MC14075B. This means PCB layouts designed for the older 4000-series CMOS device can reuse the same footprint, pad geometry, and trace routing-enabling direct substitution without board revision, provided the 2–6 V supply range and faster timing meet system requirements.

What is the maximum capacitive load the MC74HC4075N can drive while maintaining specified propagation delay?

The MC74HC4075N AC specifications are characterized at CL = 50 pF. While not explicitly rated beyond that, propagation delay increases approximately linearly with load capacitance. At VCC = 5 V, tPLH/tPHL grows from 23 ns (50 pF) to ~45 ns at 100 pF. For reliable timing closure, keep total node capacitance-including trace, probe, and input capacitance of downstream devices-below 50 pF unless re-characterized per application.

Does the MC74HC4075N require external pull-up resistors on inputs when interfacing with open-collector LSTTL outputs?

Yes-when interfacing with open-collector or open-drain LSTTL outputs, external pull-up resistors are required on MC74HC4075N inputs to establish valid HIGH logic levels. The device's CMOS inputs have high impedance; without pull-ups, floating inputs risk metastability or increased EMI susceptibility. Typical values range from 4.7 kΩ to 10 kΩ to VCC, depending on speed and noise requirements.