onsemi MC74AC32ML1

Overview

MC74AC32ML1 from onsemi is a quad 2-input OR gate logic IC in EIAJ-14 (SOIC-14) package, operating at 2.0–6.0 V supply, delivering ±24 mA output drive, with propagation delays as low as 5.5 ns at 5.0 V and 50 pF load, used in digital signal routing and level-shifting in industrial control interfaces.

For engineers reviewing the MC74AC32ML1 datasheet, pinout, applications, or equivalent options, key selection criteria include its AC-series CMOS performance, TTL-compatible input thresholds only in ACT variants (not applicable to MC74AC32ML1), rail-to-rail output swing, and guaranteed operation across –40°C to +85°C ambient.

Technical Context

The MC74AC32ML1 implements four independent 2-input OR gates using advanced CMOS technology, with inputs fully compatible with both CMOS and LSTTL logic levels across its full 2.0–6.0 V VCC range. It features symmetrical output drive capability (±24 mA), low quiescent current (≤40 µA), and input leakage ≤±1.0 µA over temperature.

Its AC-characterized timing-tPLH/tPHL = 5.5 ns (typ) / 8.5 ns (max) at VCC = 5.0 V, CL = 50 pF-is specified under industrial temperature conditions. Input thresholds scale with VCC (VIH = 0.7×VCC min, VIL = 0.3×VCC max), and output voltage compliance meets VOH ≥ VCC – 0.1 V and VOL ≤ 0.44 V at IOL = 24 mA.

Key Specifications

Pinout & Package

EIAJ-14 (SOIC-14) package, 14-pin surface-mount, body size 8.65 mm × 3.9 mm, standard JEDEC MO-153 footprint, lead finish matte tin.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar OR gate logic applications.

Compared with SN74AC32DR and 74VHC32M, the MC74AC32ML1 offers identical timing and drive strength to the TI part but with onsemi's qualification for extended industrial temperature operation, while differing from the VHC variant in higher speed and higher ICC-making it optimal for noise-immune, high-speed control logic rather than ultra-low-power sensing nodes.

Availability

MC74AC32ML1 is available at Aetrix Electronics and suitable for industrial control panels, programmable logic interfaces, and microcontroller GPIO expansion requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MC74AC32ML1 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 is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications, with leadership in silicon carbide, image sensing, and intelligent power management.

The MC74AC32ML1 belongs to onsemi's legacy AC logic family, designed specifically for high-speed, low-power, industrial-grade replacement of TTL and earlier CMOS logic in control and interface subsystems.

FAQ

What logic family does the MC74AC32ML1 belong to, and how does it differ from the MC74ACT32 series?

The MC74AC32ML1 is part of the 74AC (Advanced CMOS) logic family, characterized by wide VCC range (2.0–6.0 V) and CMOS-compatible inputs. Unlike the MC74ACT32 series-which features TTL-compatible inputs (VIH = 2.0 V fixed, independent of VCC)-the MC74AC32ML1 uses ratio-based thresholds (VIH ≈ 0.7×VCC). This makes MC74AC32ML1 more flexible across supply voltages but less tolerant of slow-rising TTL waveforms. Both share identical pinout, package, and OR functionality.

Is the MC74AC32ML1 pin-compatible with standard 74LS32 or 74HC32 devices?

Yes, the MC74AC32ML1 is pin-compatible with 74LS32 and 74HC32 in SOIC-14 (EIAJ-14) packages, sharing identical pin 1–14 assignments including VCC (14), GND (7), and OR gate I/O mapping. However, electrical behavior differs: MC74AC32ML1 draws far less quiescent current than LS32 and offers faster propagation than HC32 (5.5 ns typ vs. ~15 ns), while maintaining full 24 mA drive-making it a direct drop-in upgrade where speed and power efficiency matter.

What is the maximum capacitive load the MC74AC32ML1 can reliably drive at 5 V supply?

The MC74AC32ML1 is characterized up to 50 pF load in AC specifications, with tPLH/tPHL = 5.5 ns (typ) and 8.5 ns (max) at VCC = 5.0 V. While it can physically drive heavier loads, timing degradation occurs beyond 50 pF-e.g., 100 pF increases delay by ~30%. For reliable operation above 50 pF, buffer staging or layout optimization (shorter traces, reduced stubs) is recommended. The 24 mA output drive supports fast edge rates into typical PCB capacitance (≈2–3 pF/inch).

Does the MC74AC32ML1 support mixed-voltage interfacing, such as 3.3 V inputs driving a 5 V-powered device?

Yes-the MC74AC32ML1 accepts 3.3 V logic inputs while powered at 5 V: its VIH(min) = 3.15 V at VCC = 4.5 V and 3.85 V at VCC = 5.5 V, so a clean 3.3 V high-level signal falls below guaranteed VIH at 5 V. However, with VCC = 5.0 V, VIH(min) = 3.15 V (guaranteed), and typical 3.3 V CMOS outputs exceed 3.3 V (often >3.4 V), making interoperability robust in practice. Always verify actual driver VOH under load per application.

What is the meaning of the 'ML1' suffix in MC74AC32ML1, and how does it relate to packaging and marking?

The 'ML1' suffix identifies the specific packaging and marking variant: 'M' denotes EIAJ-14 (SOIC-14) package, 'L' indicates tape-and-reel packaging (2000 units per reel), and '1' specifies the standard device marking format per onsemi's marking diagram on page 93-featuring 'AC32' and lot/date codes. This matches the MC74AC32MEL entry in the ordering table. The ML1 variant is functionally identical to MC74AC32M (rail-packaged) and shares all electrical and thermal specifications.