onsemi MC74HCT365ADG

Overview

MC74HCT365ADG from onsemi is a hex non-inverting buffer/line driver with 3-state outputs, designed for TTL-compatible logic interfacing in industrial control and data acquisition systems. It operates at 4.5–5.5 V, features ±4 mA output drive, 18 ns typical propagation delay at 5 V, and supports bus-hold functionality on inputs.

For engineers reviewing the MC74HCT365ADG datasheet, pinout, applications, or equivalent options, key selection considerations include its 3-state enable control timing, TTL-level input thresholds, bus-hold input stabilization, and SOIC-16 package compatibility with legacy 74HCT logic layouts.

Technical Context

This device implements six independent non-inverting buffers, each with separate 3-state output control (1OE, 2OE) enabling dual-group bus driving. Inputs are TTL-compatible (V_IL = 0.8 V max, V_IH = 2.0 V min), ensuring reliable interfacing with legacy 5 V microcontrollers and FPGAs.

The SOIC-16 package supports surface-mount assembly and thermal performance up to 125°C ambient. Bus-hold circuitry maintains valid logic states on un-driven inputs without external pull-ups, reducing BOM count in high-impedance bus environments.

Key Specifications

Pinout & Package

MC74HCT365ADG is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and rated for reflow soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT365N and 74HCT365PW, the MC74HCT365ADG offers SOIC-16 packaging optimized for industrial reflow processes, integrated bus-hold for reduced external components, and extended temperature qualification - making it ideal for production-grade embedded control systems.

Availability

MC74HCT365ADG is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, test equipment signal routing, and legacy microcontroller interface applications requiring stable component supply across long product lifecycles.

Supply support for MC74HCT365ADG 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 leader delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and edge applications.

The MC74HCT365ADG belongs to the 74HCT logic family, engineered for robust 5 V TTL-to-CMOS interfacing in harsh industrial and automotive environments with emphasis on noise immunity, wide temperature operation, and bus stability.

FAQ

What is the maximum clock frequency supported by MC74HCT365ADG?

The MC74HCT365ADG is not a clocked device-it has no internal clock and functions as a combinatorial buffer. Its usable data rate depends on propagation delay (18 ns typical) and system timing margins. For reliable operation, signal transitions should allow ≥35 ns minimum pulse width to accommodate worst-case delay and skew across all six channels. The MC74HCT365ADG is typically deployed in asynchronous bus interfaces below 20 MHz.

Does MC74HCT365ADG require external pull-up resistors on its inputs?

No. The MC74HCT365ADG integrates bus-hold circuitry on all six inputs, which actively maintains the last-valid logic state when inputs are floating or unterminated. This eliminates the need for external pull-up or pull-down resistors in most applications, reducing BOM cost and PCB area. External resistors may still be used if specific biasing or fail-safe behavior is required beyond bus-hold capability.

Can MC74HCT365ADG drive LED indicators directly?

Yes, the MC74HCT365ADG can drive standard 5 mA LEDs with appropriate current-limiting resistors. Each output provides ±4 mA drive strength at V_OH/V_OL, sufficient for low-current indicator LEDs. For example, with a 5 V supply and red LED (V_F ≈ 1.8 V), a 680 Ω resistor limits current to ~4.7 mA. Always verify voltage drop and thermal derating in high-duty-cycle applications. The MC74HCT365ADG is not intended for high-current loads like relays or motors.

What is the function of pins 3 and 14 on MC74HCT365ADG?

Pins 3 and 14 are active-low output enable terminals: pin 3 (1OE) controls outputs Y1–Y3, and pin 14 (2OE) controls outputs Y4–Y6. When either enable pin is held low, its associated group of three outputs drives the input signal; when high, those outputs enter high-impedance (Hi-Z) state. This dual-enable architecture allows independent bus segmentation-critical for avoiding contention in multi-master or time-sliced data paths. Both enables must be low for full 6-channel operation.

Is MC74HCT365ADG compatible with 3.3 V logic systems?

The MC74HCT365ADG is not 3.3 V–tolerant: it requires a 4.5–5.5 V supply and interprets inputs using TTL thresholds (V_IH ≥ 2.0 V). While 3.3 V CMOS outputs may meet the V_IH threshold, they risk marginal noise margins and are not guaranteed across temperature and process variation. For mixed-voltage systems, use a dedicated level translator or select a 3.3 V–compatible logic family (e.g., 74LVC). The MC74HCT365ADG is strictly a 5 V interface device.