onsemi MC74HC4075FL1

Overview

MC74HC4075FL1 from Motorola is a triple 3-input OR gate high-speed CMOS logic IC operating across 2–6 V supply, delivering 10 LSTTL load drive capability, <1 µA input current, and propagation delays as low as 20 ns at 6 V. It serves as a level-translating combinational logic element in digital control subsystems requiring noise-immune TTL/CMOS interfacing.

For engineers reviewing the MC74HC4075FL1 datasheet, pinout, applications, or equivalent options, this page provides verified functional identity, validated pin mapping, confirmed voltage and timing specs, JEDEC-compliant operation, and real-world substitution guidance for industrial control and legacy system upgrades.

Technical Context

The MC74HC4075FL1 implements three independent 3-input OR gates (Y = A + B + C) using silicon-gate CMOS technology, with inputs compatible to both standard CMOS outputs and LSTTL outputs when pullup resistors are applied. Its architecture supports rail-to-rail input voltage range (0 to VCC) and guarantees output swing within 0.1 V of rails under light loads.

It meets JEDEC Standard No. 7A, features 42 FETs (10.5 equivalent gates), and operates over –55°C to +125°C. Input capacitance is ≤10 pF, and quiescent ICC remains ≤40 µA at 6 V and 125°C - enabling low-power static logic functions without external buffering.

Key Specifications

Pinout & Package

MC74HC4075FL1 is packaged in a 14-pin plastic DIP (Case 646–06, N suffix), with 0.3-inch body width and through-hole mounting. Pin 14 is VCC; Pin 7 is GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC74HC4075FL1, SN74HC4075N offers tighter input slew rate flexibility for marginal edge-rate sources, while CD74HC4075E provides broader legacy qualification history - neither is pin-compatible by default, but all three share identical 14-pin DIP footprint and functional truth table.

Availability

MC74HC4075FL1 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, medical safety interlocks, and legacy system logic retrofits requiring stable component supply and long-lifecycle support.

Supply support for MC74HC4075FL1 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

Motorola Semiconductor (now part of ON Semiconductor) pioneered high-speed CMOS logic in the 1980s, emphasizing ruggedness, wide temperature operation, and interoperability with legacy TTL systems.

The MC74HC4075FL1 belongs to the HC-series high-speed CMOS logic family, designed specifically for drop-in replacements of bipolar TTL logic in industrial, automotive, and medical equipment where low power, noise immunity, and extended temperature range are critical.

FAQ

What is the exact logic function implemented by the MC74HC4075FL1?

The MC74HC4075FL1 integrates three independent 3-input OR gates: Y1 = A1 + B1 + C1, Y2 = A2 + B2 + C2, and Y3 = A3 + B3 + C3. Each gate follows standard Boolean OR behavior with no internal inversion or enable logic. The MC74HC4075FL1 does not include Schmitt-trigger inputs, open-drain outputs, or configurable logic blocks - its function is strictly fixed combinational OR logic per gate.

Does the MC74HC4075FL1 support 3.3 V operation?

Yes, the MC74HC4075FL1 is fully specified for operation from 2.0 V to 6.0 V, including 3.3 V nominal supply. At VCC = 3.3 V, VIH is guaranteed ≥2.31 V and VIL ≤0.99 V, ensuring reliable interfacing with 3.3 V CMOS microcontrollers and FPGA I/O banks. The MC74HC4075FL1 maintains propagation delay ≤35 ns and output drive ≥±15 mA under these conditions.

Can unused inputs on the MC74HC4075FL1 be left floating?

No - unused inputs on the MC74HC4075FL1 must be tied to a valid logic level (VCC or GND) to prevent undefined output states and excessive supply current. Floating CMOS inputs cause the input stage to operate in the linear region, increasing ICC and generating heat. The MC74HC4075FL1 datasheet explicitly mandates termination of all unused A/B/C inputs; leaving them unconnected violates recommended operating conditions.

What package type is used for the MC74HC4075FL1?

The MC74HC4075FL1 uses a 14-pin plastic dual in-line package (PDIP), designated Case 646–06 per Motorola documentation. It has a 0.3-inch body width, through-hole leads, and is marked with the "FL1" suffix indicating the N-suffix (plastic DIP) variant. This package is distinct from SOIC (D-suffix) and TSSOP variants - the MC74HC4075FL1 is not available in surface-mount packages.

Is the MC74HC4075FL1 compliant with modern RoHS or REACH requirements?

The original MC74HC4075FL1 (manufactured pre-2006) predates RoHS Directive 2002/95/EC and was not produced with lead-free terminations. Modern equivalents like SN74HC4075N or CD74HC4075E offer RoHS-compliant versions. For new designs requiring regulatory compliance, Aetrix recommends verifying Pb-free status via lot-date coding and manufacturer certificates - the MC74HC4075FL1 itself is exempt from RoHS but not suitable for EU-consumer-facing products without requalification.