onsemi MC74ACT32NG

Overview

MC74ACT32NG from onsemi is a quad 2-input OR gate in SOIC-14 package, featuring TTL-compatible inputs, ±24 mA output drive, 5.0 V nominal supply operation, and guaranteed propagation delay ≤10 ns at 5.0 V/50 pF. It serves as a logic-level combiner in industrial control signal routing, microcontroller peripheral interfacing, and digital bus arbitration circuits.

For engineers reviewing the MC74ACT32NG datasheet, pinout, applications, or equivalent options, key selection criteria include input compatibility with legacy TTL systems, output current capability under 5.0 V supply, thermal performance in SOIC-14 (116 °C/W θ_JA), and RoHS-compliant Pb-free packaging for industrial-grade reliability.

Technical Context

The MC74ACT32NG implements four independent 2-input OR logic functions using high-performance silicon-gate CMOS technology. Its TTL-compatible inputs accept VIH ≥2.0 V and VIL ≤0.8 V at VCC = 4.5–5.5 V, enabling direct interface with 5 V TTL outputs without level shifting.

Each output delivers VOH ≥4.4 V at IOH = −24 mA and VOL ≤0.44 V at IOL = 24 mA under 5.0 V supply, supporting robust fanout to multiple CMOS or TTL loads. Propagation delays are specified at tPLH/tPHL ≤10.0 ns (max) over −40°C to +85°C with CL = 50 pF.

Key Specifications

Pinout & Package

MC74ACT32NG is housed in a 14-lead SOIC package (Case 751A, Pb-free), measuring 8.75 mm × 4.00 mm × 1.75 mm with 1.27 mm pitch. The package features gull-wing leads, exposed copper pad not present, and is compatible with standard reflow profiles per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT32DR and 74VHC32M, MC74ACT32NG offers the strictest TTL input compatibility and highest guaranteed output drive at 5 V, making it optimal for legacy interface consolidation where signal integrity and load capacity are prioritized over minimal propagation delay or wide supply flexibility.

Availability

MC74ACT32NG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, microcontroller-based sensor hubs, and legacy system upgrades requiring stable component supply with full industrial temperature support and RoHS compliance.

Supply support for MC74ACT32NG 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 focused on energy-efficient electronics, delivering power management, analog, logic, and sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC74ACT32NG belongs to onsemi's 74ACT logic family, engineered specifically for seamless interoperability between TTL and CMOS systems in industrial control and instrumentation applications where reliability and input compatibility are critical.

FAQ

What logic family does MC74ACT32NG belong to, and how does it differ from standard 74AC devices?

The MC74ACT32NG belongs to the 74ACT logic family, distinguished by TTL-compatible input thresholds (VIH ≥2.0 V, VIL ≤0.8 V at 5 V), unlike standard 74AC devices which require CMOS-level inputs (VIH ≥3.15 V). This allows MC74ACT32NG to interface directly with legacy 74LS and 74F outputs without level-shifting circuitry, while retaining CMOS output drive strength and noise immunity. The MC74ACT32NG maintains identical pinout and DC/AC specifications to its 74AC counterpart except for input voltage requirements.

Can MC74ACT32NG operate reliably at 3.3 V supply voltage?

No, MC74ACT32NG is not rated for 3.3 V operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, and its TTL-compatible inputs are characterized only within that range. At 3.3 V, VIH and VIL thresholds become undefined per datasheet, and output drive degrades significantly below specification. For 3.3 V systems, consider 74LVC32 or 74AUP32 variants instead. MC74ACT32NG must be used at 5.0 V nominal with tight regulation (±5%) to meet guaranteed timing and drive performance.

What is the maximum capacitive load MC74ACT32NG can drive while maintaining specified propagation delay?

MC74ACT32NG's AC characteristics-including tPLH/tPHL ≤10.0 ns-are specified with CL = 50 pF. Driving loads beyond 50 pF increases propagation delay nonlinearly; at 100 pF, typical delay exceeds 15 ns and may violate setup/hold timing in high-speed designs. For loads >50 pF, add series termination or buffer stages. The MC74ACT32NG's output structure supports this load via its ±24 mA drive, but timing margins must be verified per actual layout parasitics-not just discrete capacitor value.

Does MC74ACT32NG support hot-swap or live-insertion into powered systems?

No, MC74ACT32NG is not hot-swap rated. Its absolute maximum ratings do not include powered insertion stress conditions, and the device lacks bus-hold or I_OFF protection. Applying VCC before GND, or connecting inputs while VCC is ramping, risks latch-up or ESD damage per JEDEC JESD78 testing. Always power the MC74ACT32NG board fully before applying input signals, and follow controlled power sequencing: GND → VCC → inputs. No special circuitry enables safe live insertion of MC74ACT32NG.

How is the "G" suffix in MC74ACT32NG interpreted per onsemi's marking convention?

The "G" suffix in MC74ACT32NG explicitly denotes Pb-free (lead-free) construction and RoHS compliance per EU Directive 2011/65/EU. It appears in the device marking as part of the package code (e.g., "ACT32G") and confirms that solderability, thermal profile compatibility, and material content meet IPC-J-STD-020 and JEDEC JS-001 standards. The "G" does not indicate tape-and-reel packaging or temperature grade-it solely certifies Pb-free finish on all terminations and internal die attach. All MC74ACT32NG units shipped by Aetrix Electronics carry this designation.