onsemi MC74HC4075FR2

Overview

MC74HC4075FR2 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 control systems requiring discrete combinational logic with TTL/CMOS interfacing.

For engineers reviewing the MC74HC4075FR2 datasheet, pinout, applications, or equivalent options, key selection considerations include supply voltage range (2–6 V), propagation delay (20 ns @ 6 V), output drive capability (±25 mA), input compatibility with LSTTL (with pullups), and SOIC-14 package constraints.

Technical Context

The MC74HC4075FR2 implements three independent 3-input OR gates (Y = A + B + C) using silicon-gate CMOS process technology. Each gate exhibits rail-to-rail output swing, guaranteed VOH ≥ 5.9 V and VOL ≤ 0.1 V at VCC = 6.0 V with 20 µA load, and supports operation across –55 °C to +125 °C.

Input thresholds are defined by VIH ≥ 4.2 V and VIL ≤ 1.2 V at VCC = 6.0 V, ensuring robust noise margins. Propagation delays are characterized up to 175 ns at worst-case temperature (125 °C) and VCC = 2.0 V, with transition times ≤19 ns under same conditions.

Key Specifications

Pinout & Package

MC74HC4075FR2 is housed in a 14-pin SOIC package (Case 751A–03), with 1.27 mm pitch, body width 3.80–4.00 mm, and total length 8.55–8.75 mm. Pin 14 is VCC; Pin 7 is GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC4075DR and 74VHC4075M, the MC74HC4075FR2 uniquely supports –55 °C to +125 °C operation and 6 V supply while maintaining pin compatibility - making it the only option among the three qualified for aerospace-grade thermal cycling and legacy 5 V/6 V mixed-rail systems.

Availability

MC74HC4075FR2 is available at Aetrix Electronics and suitable for industrial control logic, automotive body controllers, consumer appliance UIs, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC74HC4075FR2 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 manufacturer specializing in energy-efficient electronics, with roots in Motorola's semiconductor division and expertise in analog, logic, and power management ICs.

The MC74HC4075FR2 belongs to the HC-series high-speed CMOS logic family, designed for drop-in replacement of older TTL and CD4000-series devices while delivering lower power, higher noise immunity, and broader supply voltage flexibility.

FAQ

What logic function does the MC74HC4075FR2 implement?

The MC74HC4075FR2 implements three independent 3-input OR gates, each following the Boolean expression Y = A + B + C. All inputs and outputs are fully buffered, and the device is functionally identical to MC14075B in pinout and truth table. The MC74HC4075FR2 does not include internal inverters, latches, or enable controls - it is purely combinational logic with no memory or sequencing behavior.

Is the MC74HC4075FR2 compatible with 3.3 V logic systems?

Yes, the MC74HC4075FR2 operates over 2.0 V to 6.0 V, making it fully compatible with 3.3 V logic systems. At VCC = 3.3 V, VIH is guaranteed ≥ 2.31 V and VIL ≤ 0.99 V, providing >0.8 V noise margin. Its outputs swing rail-to-rail, so a 3.3 V-powered MC74HC4075FR2 drives other 3.3 V CMOS inputs directly without level translation. The MC74HC4075FR2 also accepts 5 V-tolerant inputs when used with appropriate pullup resistors in mixed-voltage interfaces.

What is the maximum operating temperature for the MC74HC4075FR2?

The MC74HC4075FR2 is rated for operation from –55 °C to +125 °C across all package variants, including the FR2 (SOIC-14) variant. This extended temperature range is validated per JEDEC Standard No. 7A and confirmed in the DC and AC electrical characteristics tables across all three temperature bins (–55 °C, 25 °C, and +125 °C). The MC74HC4075FR2 maintains full functionality - including propagation delay, output drive, and noise immunity - throughout this range without derating.

Does the MC74HC4075FR2 require external pull-up resistors for LSTTL compatibility?

Yes, the MC74HC4075FR2 inputs are compatible with LSTTL outputs only when external pull-up resistors are used. LSTTL outputs cannot reliably drive CMOS inputs to VIH without pullups due to weak high-side drive. A typical 10 kΩ pull-up to VCC ensures the input reaches ≥4.2 V at VCC = 6.0 V, satisfying the guaranteed VIH threshold. The MC74HC4075FR2 itself does not integrate pull-ups; unused inputs must be tied to VCC or GND - never left floating - to prevent increased ICC and potential oscillation.

What package type is used for the MC74HC4075FR2?

The MC74HC4075FR2 uses a 14-pin Small Outline Integrated Circuit (SOIC) package, designated Case 751A–03 by ON Semiconductor. It has a 1.27 mm lead pitch, body width of 3.80–4.00 mm, and overall length of 8.55–8.75 mm. This surface-mount package is RoHS-compliant, moisture-sensitive level 1 (MSL-1), and optimized for automated reflow assembly. The FR2 suffix explicitly denotes this SOIC-14 configuration - distinct from the N-suffix plastic DIP (Case 646–06) variant.