onsemi MC74HCT365ADTG

Overview

MC74HCT365ADTG from onsemi is a hex non-inverting buffer/line driver with 3-state outputs, designed for bus interface applications requiring high noise immunity and TTL-compatible inputs. It operates at 4.5–5.5 V, supports 8 mA output drive, features 18 ns typical propagation delay at 5 V, and is rated for industrial temperature range (−40°C to +85°C). It is used in microcontroller I/O expansion and address/data bus buffering.

For engineers reviewing the MC74HCT365ADTG datasheet, pinout, applications, or equivalent options, key selection criteria include 3-state control timing, input hysteresis for noise rejection, output drive capability into capacitive loads, and compatibility with legacy 5 V TTL logic systems.

Technical Context

The MC74HCT365ADTG integrates six independent non-inverting buffers, each with separate 3-state enable control (1OE, 2OE) active-low. Its CMOS HCT process ensures TTL-level input thresholds while delivering CMOS-level output swing and low static current.

All inputs include hysteresis (typically 0.6 V), enhancing noise immunity in noisy industrial environments. Outputs are specified for symmetrical sourcing/sinking (±8 mA) and support fan-out of 10 LS-TTL loads per channel at 5 V.

Key Specifications

Pinout & Package

MC74HCT365ADTG is housed in a 16-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm lead pitch, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT365PW and 74VHC365M, the MC74HCT365ADTG offers superior noise immunity due to built-in input hysteresis and is optimized for stable 5 V industrial bus interfaces where reliability trumps raw speed.

Availability

MC74HCT365ADTG is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant manufacturing.

Supply support for MC74HCT365ADTG 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 IoT applications.

The MC74HCT365ADTG belongs to onsemi's HCT logic family, engineered specifically for seamless interoperability with legacy TTL systems while delivering CMOS efficiency and noise-hardened performance in industrial control environments.

FAQ

What is the maximum clock frequency supported by MC74HCT365ADTG?

The MC74HCT365ADTG is not a clocked device-it has no internal clock and functions as a combinational buffer. Its usable data rate depends on propagation delay (18 ns typical) and load capacitance. For a 15 pF load, it reliably supports bus toggle frequencies up to approximately 25 MHz, assuming proper PCB layout and termination.

Does MC74HCT365ADTG support mixed-voltage operation (e.g., 3.3 V inputs with 5 V supply)?

No. The MC74HCT365ADTG requires TTL-compatible input voltages referenced to its 5 V supply. Inputs below 0.8 V are recognized as LOW; above 2.0 V as HIGH. Applying 3.3 V signals directly is acceptable since they exceed V_IH, but 3.3 V–only logic families may not reliably drive it without a level shifter due to insufficient noise margin.

Can MC74HCT365ADTG outputs be paralleled for higher current drive?

No. Paralleling outputs of the MC74HCT365ADTG is not recommended. Even with matched enable timing, minor propagation delay mismatches can cause momentary shoot-through currents. For higher drive, use a dedicated high-current buffer or discrete MOSFET stage instead of output paralleling.

Is MC74HCT365ADTG pin-compatible with older 74LS365 devices?

Yes. The MC74HCT365ADTG maintains identical pinout, logic function, and DC electrical behavior as the 74LS365, making it a direct drop-in replacement. Key improvements include lower power consumption, higher noise immunity via input hysteresis, and improved output drive capability-no PCB changes required.

What is the purpose of the dual output enable pins (1OE and 2OE) on MC74HCT365ADTG?

The dual active-low output enables (1OE on pin 3, 2OE on pin 8) independently control two groups of three buffers each (Y1–Y3 and Y4–Y6). This allows partial bus isolation-for example, enabling only address lines while holding data lines in high-Z during memory access cycles-reducing bus contention and dynamic power.