onsemi MC74HC32AFELG

Overview

MC74HC32AFELG from onsemi is a quad 2-input OR gate in high-performance silicon-gate CMOS technology, operating from 2.0 V to 6.0 V supply, delivering 10 LSTTL load drive capability with propagation delay as low as 13 ns at 6.0 V, and used in digital logic interfacing, level translation, and combinational signal routing in industrial control and instrumentation systems.

For engineers reviewing the MC74HC32AFELG datasheet, pinout, applications, or equivalent options, key selection criteria include supply voltage range (2.0–6.0 V), guaranteed propagation delay (≤19 ns at 4.5 V), input compatibility with CMOS/LSTTL (with pullups), output drive strength, and SOIC-14 package thermal performance (θ_JA = 116 °C/W).

Technical Context

The MC74HC32AFELG implements four independent OR logic functions (Y = A + B) using standard CMOS transistor pairs per gate, with inputs tolerant of LSTTL levels when externally pulled up. It features rail-to-rail output swing and exhibits high noise immunity due to its CMOS architecture and defined VIH/VIL thresholds across temperature.

Its DC characteristics are fully specified over –55 °C to +125 °C, with input leakage ≤ ±1.0 µA at 6.0 V and quiescent ICC ≤ 40 µA at 125 °C. AC performance is characterized with 50 pF load and includes transition times ≤19 ns at 4.5 V, supporting reliable operation in synchronous and asynchronous combinatorial logic paths.

Key Specifications

Pinout & Package

MC74HC32AFELG is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, case 751A, with 1.27 mm pitch, 8.75 mm × 3.90 mm body, and θ_JA = 116 °C/W. Pin 1 is index-marked; Pin 7 is GND; Pin 14 is V_CC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC32DR and 74VHC32M, MC74HC32AFELG provides the widest operating temperature range (–55 °C to +125 °C) and full 6.0 V support, making it uniquely suitable for under-hood automotive and high-reliability industrial deployments where thermal margin and voltage flexibility are design constraints.

Availability

MC74HC32AFELG is available at Aetrix Electronics and suitable for industrial PLCs, automotive body controllers, digital power sequencers, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC74HC32AFELG 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 silicon solutions for automotive, industrial, cloud computing, and IoT applications.

The MC74HC32AFELG belongs to onsemi's legacy HC logic family, designed for drop-in replacement of TTL logic while delivering CMOS power efficiency, wide voltage operation, and robust industrial temperature performance.

FAQ

What logic family does MC74HC32AFELG belong to, and how does it differ from the HCT variant?

MC74HC32AFELG belongs to the high-speed CMOS (HC) logic family. It differs from the HCT variant (e.g., MC74HCT32A) in input threshold compatibility: HC inputs require CMOS-level signals (VIH ≥ 3.15 V at 4.5 V), while HCT inputs are TTL-compatible (VIH = 2.0 V). MC74HC32AFELG operates from 2.0 V to 6.0 V, whereas HCT is limited to 4.5–5.5 V. Both share identical pinout and OR functionality.

Is MC74HC32AFELG pin-compatible with older 74LS32 devices?

Yes, MC74HC32AFELG is pin-compatible with the 74LS32 TTL quad OR gate. Its pinout matches LS32 exactly (14-pin SOIC), allowing direct PCB replacement. However, because MC74HC32AFELG is CMOS, unused inputs must be tied to V_CC or GND - unlike LS32, which tolerates floating inputs - to prevent increased ICC and potential oscillation.

What is the maximum capacitive load MC74HC32AFELG can drive while maintaining guaranteed timing?

MC74HC32AFELG is characterized with a 50 pF load for AC specifications including t_PLH, t_PHL, and transition times. Driving loads significantly above 50 pF increases propagation delay nonlinearly and may violate setup/hold timing in synchronous systems. For >50 pF loads, buffer stages or lower-capacitance PCB layout practices are recommended to maintain guaranteed 13–22 ns timing performance.

Does MC74HC32AFELG support mixed-voltage interfacing, such as 3.3 V inputs driving a 5 V-powered device?

No - MC74HC32AFELG does not support mixed-voltage interfacing in that configuration. Its inputs are referenced to its own V_CC; applying 3.3 V to an input while V_CC = 5 V is within the absolute maximum rating (VIN ≤ V_CC + 0.5 V), but VIH is specified as ≥3.15 V at V_CC = 4.5 V, so 3.3 V may not guarantee logic-high recognition. For reliable 3.3 V → 5 V translation, use a dedicated level shifter or the MC74HCT32A variant instead.

What packaging and marking details confirm MC74HC32AFELG is Pb-free and RoHS-compliant?

MC74HC32AFELG uses a Pb-free SOIC-14 package (case 751A) with "G" suffix in the ordering code and "G" or microdot marking on the device body. Per the datasheet, it is halogen-free/BFR-free and compliant with RoHS Directive 2011/65/EU. The "−Q" suffix denotes AEC-Q100 qualification; MC74HC32AFELG lacks "−Q", confirming it is industrial-grade, not automotive-qualified.