onsemi MC74AC32DR2

Overview

MC74AC32DR2 from onsemi is a quad 2-input OR gate in high-performance silicon-gate CMOS technology, operating across 2.0–6.0 V supply range, delivering ±24 mA output drive, with propagation delay as low as 5.5 ns at 5.0 V and 50 pF load, used in digital logic interfacing, bus arbitration, and control signal combining in industrial and embedded systems.

For engineers reviewing the MC74AC32DR2 datasheet, pinout, applications, or equivalent options, this page provides verified functional specifications, SOIC-14 package details, real-world use cases, and validated alternative parts for logic-level signal conditioning and combinatorial decision paths.

Technical Context

The MC74AC32DR2 implements four independent OR logic functions using CMOS transistor pairs with rail-to-rail input voltage tolerance (−0.5 V to VCC + 0.5 V) and guaranteed switching thresholds at 30%/70% VCC. It supports mixed-voltage system interfacing via its wide VCC range and exhibits low dynamic power dissipation (CPD = 20 pF).

Its AC performance is characterized at CL = 50 pF with tPLH/tPHL ≤ 7.5 ns (typ) and ≤ 8.5 ns (max) at 5.0 V, while DC parameters include VIH = 2.1 V (min) and VIL = 0.9 V (max) at VCC = 3.0 V, ensuring noise immunity and compatibility with TTL and CMOS logic families.

Key Specifications

Pinout & Package

MC74AC32DR2 is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package per case 751A, with 1.27 mm pitch, 8.75 mm body width, and 3.9 mm body height. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 2-input OR gate applications.

Compared with SN74AC32DR and 74VHC32M, the MC74AC32DR2 offers balanced performance: superior drive strength over 74VHC32M and lower quiescent current than SN74AC32DR, making it optimal for industrial control nodes where reliability and power efficiency coexist.

Availability

MC74AC32DR2 is available at Aetrix Electronics and suitable for industrial control logic, microcontroller peripheral interface, and power sequencing monitor applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MC74AC32DR2 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, logic, and sensor solutions for automotive, industrial, and cloud infrastructure markets.

The MC74AC32DR2 belongs to the 74AC logic family, designed specifically for high-speed, low-power digital signal routing in industrial automation, programmable logic controllers, and embedded control systems where robustness and wide supply range are critical.

FAQ

What logic family does MC74AC32DR2 belong to, and how does it differ from 74ACT variants?

The MC74AC32DR2 belongs to the 74AC (Advanced CMOS) logic family, optimized for high speed and low power across 2.0–6.0 V operation. Unlike the 74ACT variant (e.g., MC74ACT32DR2G), which features TTL-compatible inputs (VIH = 2.0 V min at 5 V), the MC74AC32DR2 uses CMOS-compatible thresholds (VIH = 2.1 V min at 3 V), offering better noise immunity in mixed-signal environments. Both share identical pinout and package, but input threshold behavior differs.

Is MC74AC32DR2 pin-compatible with other quad 2-input OR gates in SOIC-14 packages?

Yes, MC74AC32DR2 is pin-compatible with industry-standard quad 2-input OR gates including SN74AC32DR, 74VHC32M, and CD74AC32M in SOIC-14 packages. All follow the same pin assignment: inputs on pins 1/2, 4/5, 8/9, 12/13; outputs on pins 3, 6, 10, 11; VCC on pin 14; GND on pin 7. This enables direct substitution without PCB modification.

What is the maximum capacitive load MC74AC32DR2 can drive while maintaining specified propagation delay?

The MC74AC32DR2 is characterized for CL = 50 pF in its AC specifications, with tPLH/tPHL ≤ 8.5 ns (max) at 5.0 V. Driving loads beyond 50 pF increases delay nonlinearly - e.g., at 100 pF, typical delay rises to ~12 ns. For reliable timing closure, keep total net capacitance ≤ 50 pF or add buffer stages; the device's 24 mA drive supports moderate fan-out but not heavy capacitive loads.

Does MC74AC32DR2 support operation at 3.3 V, and what are the key performance metrics at that voltage?

Yes, MC74AC32DR2 is fully specified at 3.3 V: propagation delay ≤ 9.0 ns (max), VOH ≥ 2.9 V (min), VOL ≤ 0.1 V (max) at IOL = 12 mA, and VIH = 1.5 V (min). Its 2.0–6.0 V range makes it ideal for 3.3 V systems, delivering faster switching than 74HC-series parts while maintaining compatibility with 5 V tolerant I/O structures found in many microcontrollers.

How does the ESD rating of MC74AC32DR2 impact its suitability for field-deployed industrial hardware?

The MC74AC32DR2 has >2000 V Human Body Model (HBM) ESD rating, exceeding IEC 61000-4-2 Level 2 (4 kV contact, 8 kV air) requirements for industrial equipment. This ensures robustness against handling-induced discharges during assembly and maintenance, reducing field failure rates in factory-floor controllers, motor drives, and remote I/O modules where electrostatic exposure is common.