onsemi MC74HCT366ADR2G

Overview

MC74HCT366ADR2G from onsemi is a high-speed hex 3-state inverting buffer with two common active-low output enables, designed for bus interface and data routing in industrial control and embedded systems. It operates from 2.0 V to 6.0 V, delivers ±25 mA output drive per pin, supports LSTTL-compatible inputs, and features inverting logic with high-impedance outputs when enabled.

For engineers reviewing the MC74HCT366ADR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its dual active-low enable architecture, 16-pin SOIC package, guaranteed propagation delay of 16 ns at 6.0 V, and AEC-Q100 qualification for automotive-grade reliability.

Technical Context

The MC74HCT366ADR2G implements six independent inverting buffers, each with output controlled by shared OE1 and OE2 signals-both must be low for valid output; either high forces all Y outputs into high-impedance state. Its CMOS silicon-gate process ensures compatibility with both CMOS and LSTTL logic families across the full 2.0–6.0 V supply range.

It exhibits rail-to-rail output swing (VOH ≥ 5.9 V, VOL ≤ 0.26 V at 6.0 V/6.0 mA), low input leakage (±1.0 µA max), and robust noise immunity per JEDEC Std 7A. Propagation delays are asymmetric: tPLH/tPHL = 16 ns (6.0 V), while enable-to-output delays (tPLZ/tPHZ) reach 37 ns under same conditions.

Key Specifications

Pinout & Package

MC74HCT366ADR2G is supplied in a 16-pin Small Outline Integrated Circuit (SOIC-16) package, 9.90 mm × 3.90 mm × 1.37 mm, with 1.27 mm pitch and Pb-free (RoHS-compliant) finish.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar hex inverting buffer applications.

Compared with MC74HCT366ADR2G, SN74HCT366N offers through-hole convenience but lacks automotive qualification and Pb-free compliance, while 74HCT366PW reduces board area by 55% at the cost of slightly higher thermal resistance - making MC74HCT366ADR2G optimal for production-grade SOIC-reliant designs needing AEC-Q100 traceability.

Availability

MC74HCT366ADR2G is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for MC74HCT366ADR2G 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 sensing solutions for automotive, industrial, and cloud infrastructure markets.

The MC74HCT366ADR2G belongs to the HCT logic family - engineered for TTL-compatible CMOS performance with wide voltage operation and enhanced noise immunity for mission-critical control interfaces.

FAQ

What is the maximum operating frequency supported by MC74HCT366ADR2G?

The MC74HCT366ADR2G does not specify a maximum clock frequency in its datasheet, but its propagation delay of 16 ns at 6.0 V implies usable operation up to approximately 30 MHz in synchronous bus applications. Real-world frequency limits depend on load capacitance, trace impedance, and enable timing margins - design validation with actual PCB layout and worst-case loading is required.

Does MC74HCT366ADR2G support 3.3 V-only operation?

Yes, MC74HCT366ADR2G fully supports 3.3 V operation: VIH is guaranteed at 2.0 V (well below 3.3 V), VOL remains ≤0.26 V at 3.3 V/6.0 mA, and ICC stays within 160 µA. Its 2.0–6.0 V range makes it interoperable with both 3.3 V and 5 V logic families without external level shifters.

Can MC74HCT366ADR2G replace 74LS366 in an existing design?

Yes, MC74HCT366ADR2G is pinout-identical to 74LS366 and provides LSTTL-compatible inputs and outputs. It offers lower power consumption, wider supply range, and improved noise immunity. No PCB changes are needed, though decoupling and thermal layout should be verified due to CMOS's higher speed and lower current draw.

What is the purpose of having two output enable pins (OE1 and OE2) on MC74HCT366ADR2G?

The dual active-low enables (OE1 and OE2) provide OR logic control: if either is high, all six outputs go high-impedance. This allows flexible bus arbitration - e.g., OE1 tied to system reset and OE2 to software-controlled GPIO - enabling fail-safe isolation or hierarchical enable schemes without additional logic gates.

Is MC74HCT366ADR2G qualified for automotive applications?

The base MC74HCT366ADR2G is not AEC-Q100 qualified; however, the pin-compatible MC74HCT366ADTR2G−Q variant is explicitly rated for automotive use and PPAP-capable. For automotive designs, that Q-suffix part must be specified - MC74HCT366ADR2G itself is intended for industrial and commercial applications.