onsemi MC74ACT810N

Overview

MC74ACT810N from ON Semiconductor is a quad 2-input exclusive-NOR (XNOR) gate logic IC operating at 4.5–5.5 V supply, delivering ±24 mA output drive, 8.5 ns typical propagation delay (tPLH/tPHL @ 5 V), and TTL-compatible input thresholds. It performs bitwise logical equivalence in digital control paths, bus arbitration, and status comparison circuits within industrial PLC I/O modules.

For engineers reviewing the MC74ACT810N datasheet, pinout, applications, or equivalent options, key selection criteria include its ACT-series 5 V operation, guaranteed 24 mA sink/source per output, 50 pF load timing performance, and PDIP-14 N-suffix package compatibility with legacy through-hole designs.

Technical Context

The MC74ACT810N implements four independent 2-input XNOR gates using advanced bipolar-CMOS (ACT) process technology, ensuring TTL-level input compatibility (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5.5 V) and CMOS-level output swing (VOH ≥ 4.4 V, VOL ≤ 0.44 V at 24 mA). Each gate features symmetrical propagation delays (tPLH/tPHL ≤ 10.5/11 ns over –40°C to +85°C).

It operates strictly within 4.5–5.5 V supply range with quiescent ICC ≤ 40 µA, supports 50 pF capacitive loads, and maintains input leakage ≤ ±1.0 µA across temperature. The device is not Schmitt-triggered and requires clean input rise/fall times (≤10 ns/V at 5.5 V) for reliable switching.

Key Specifications

Pinout & Package

MC74ACT810N is housed in a 14-pin plastic dual in-line package (PDIP), case number 646-06, with 0.300-inch body width and 0.100-inch lead pitch. Pin 7 is GND; Pin 14 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT810N and MC74ACT810DR2, the MC74ACT810N offers identical electrical behavior but provides mechanical compatibility with legacy through-hole manufacturing infrastructure - critical for repair, prototyping, or low-volume industrial control boards where hand-soldering or socketing is used.

Availability

MC74ACT810N is available at Aetrix Electronics and suitable for industrial PLC I/O modules, legacy bus parity generation, digital panel indicator logic, and motor control enable validation requiring stable component supply and long-term obsolescence management.

Supply support for MC74ACT810N 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 supplier focused on energy-efficient electronics, delivering power management, analog, logic, and discrete solutions for automotive, industrial, and cloud infrastructure markets.

The MC74ACT810N belongs to ON Semiconductor's legacy 74ACT logic family, engineered for robust 5 V TTL-compatible digital interfacing in industrial control, test equipment, and retrofit applications where reliability and long-lifecycle support are essential.

FAQ

What logic family does MC74ACT810N belong to, and how does it differ from 74AC variants?

The MC74ACT810N belongs to the 74ACT logic family, characterized by TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and CMOS output drive. Unlike the 74AC variant, which operates from 2.0–6.0 V and has higher input thresholds, the MC74ACT810N is strictly 4.5–5.5 V only and ensures seamless interoperability with legacy TTL systems without level shifters. This distinction is critical when selecting MC74ACT810N for mixed-logic upgrades.

Can MC74ACT810N operate at 3.3 V supply voltage?

No, MC74ACT810N cannot operate reliably at 3.3 V. Its recommended operating supply range is strictly 4.5–5.5 V, and its TTL-compatible input thresholds require ≥2.0 V for high-level recognition - below specification at 3.3 V. Attempting 3.3 V operation risks undefined logic states and increased static current. For 3.3 V systems, consider dedicated 74LVC or 74ALVC XNOR devices instead of MC74ACT810N.

What is the maximum capacitive load MC74ACT810N can drive while maintaining specified timing?

The MC74ACT810N is characterized for 50 pF capacitive loads, with propagation delays (tPLH/tPHL) guaranteed up to 10.5/11 ns under that condition. Driving >50 pF increases delay nonlinearly and may cause marginal timing in high-speed designs. For loads exceeding 50 pF, buffer stages or lower-capacitance routing should be used. The 25 pF CPD value in the MC74ACT810N datasheet helps estimate dynamic power but does not define safe load limits.

Does MC74ACT810N have Schmitt-trigger inputs for noisy signal conditioning?

No, MC74ACT810N does not feature Schmitt-trigger inputs. Its input thresholds are fixed (VIH = 2.0 V, VIL = 0.8 V at 5.5 V), with no hysteresis. In electrically noisy environments, externally added RC filtering or dedicated Schmitt-trigger buffers (e.g., 74ACT14) are required before feeding signals into MC74ACT810N. This absence of hysteresis is explicitly noted in the AC characteristics section of the MC74ACT810N datasheet.

Is MC74ACT810N pin-compatible with MC74AC810N?

Yes, MC74ACT810N is pin-compatible with MC74AC810N - both are quad 2-input XNOR gates in PDIP-14 (N-suffix) packages with identical pinouts. However, they differ electrically: MC74AC810N supports 2.0–6.0 V operation and has higher input thresholds (VIH = 3.85 V at 5.5 V), while MC74ACT810N is 4.5–5.5 V only with TTL-compatible thresholds. Substitution requires verifying supply and input source compatibility - MC74ACT810N is not a drop-in replacement in 3.3 V or mixed-voltage systems.