NXP Semiconductors 74HCT366DB,112

Overview

74HCT366DB,112 from Nexperia is a hex inverting buffer/line driver with 3-state outputs, designed for bus interface and data routing in industrial control and embedded systems. It features TTL-compatible inputs (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), operates from -40 °C to +125 °C, delivers ±6 mA output drive at 4.5 V, and supports 3-state enable control via two independent active-low OE inputs (pins 1 and 15).

For engineers reviewing the 74HCT366DB,112 datasheet, 74HCT366DB,112 pinout, 74HCT366DB,112 application, or 74HCT366DB,112 equivalent, this device is selected for high-noise-immunity digital buffering where level-shifting between TTL logic families and CMOS loads is required, especially in space-constrained PCB layouts using SO16 packaging.

Technical Context

The 74HCT366DB,112 implements six independent inverting buffers, each with a dedicated input (1A–6A) and output (1Y–6Y), controlled by two shared 3-state enable inputs (OE1, OE2). Its TTL-level input thresholds ensure compatibility with legacy 5 V logic while driving CMOS loads with rail-to-rail swing.

Each buffer exhibits propagation delay ≤36 ns (max, VCC = 4.5 V, -40 °C to +125 °C), enable/disable times ≤53 ns, and transition time ≤18 ns under 50 pF load - enabling reliable operation in synchronous bus architectures up to ~10 MHz.

Key Specifications

Pinout & Package

74HCT366DB,112 is supplied in SO16 (SOT109-1) package: plastic small outline, 16-pin, 3.9 mm body width, 1.27 mm pitch, gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HCT366DB,112, the 74HCT366D,112 offers identical performance in a functionally interchangeable SO16 package optimized for pick-and-place, while SN74HCT366N provides through-hole compatibility at the cost of higher board area and no surface-mount scalability.

Availability

74HCT366DB,112 is available at Aetrix Electronics and suitable for industrial automation, embedded control, and test instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 74HCT366DB,112 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

Nexperia is a global semiconductor expert delivering high-performance, reliable logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.

The 74HCT366DB,112 belongs to Nexperia's 74HCT logic family, engineered for TTL-to-CMOS interfacing in industrial and automotive-adjacent applications demanding robustness and wide operating margins.

FAQ

What is the maximum clock frequency supported by the 74HCT366DB,112?

The 74HCT366DB,112 is not a clocked device but a combinational buffer - it has no internal clock. Its usable signal frequency depends on propagation delay (≤36 ns max) and load capacitance. For a 50 pF load, it reliably handles digital edges up to ~10 MHz in typical bus applications. The 74HCT366DB,112 does not impose a fixed clock limit but must meet setup/hold timing relative to system clocks.

Can the 74HCT366DB,112 drive LEDs directly?

No - the 74HCT366DB,112 is not designed for direct LED driving. Its outputs source/sink only ±6 mA (max), insufficient for most indicator LEDs requiring 10–20 mA. Using it for LED drive risks exceeding output current limits and degrading VOL/VOH specs. For LED interfacing, pair the 74HCT366DB,112 with external current-limiting resistors and/or transistor drivers.

Is the 74HCT366DB,112 pin-compatible with the 74HC366 series?

Yes - the 74HCT366DB,112 shares identical pinout, package (SO16), and functional diagram with the 74HC366 series. However, input thresholds differ: 74HCT366DB,112 accepts TTL levels (VIH ≥ 2.0 V), while 74HC366 requires CMOS levels (VIH ≥ 3.15 V at VCC = 4.5 V). Swapping them may cause logic misreads if driven by 5 V TTL sources.

Does the 74HCT366DB,112 require external pull-up or pull-down resistors on its OE pins?

No - OE1 and OE2 are active-low CMOS inputs with negligible leakage (<±1.0 μA). When driven actively (e.g., by MCU GPIO), no external resistors are needed. If left unconnected, they float HIGH, forcing all outputs into high-impedance state - which is safe but nonfunctional. For deterministic startup, tie OE1/OE2 to VCC via 10 kΩ resistors or drive them from a known logic source.

What is the thermal derating behavior of the 74HCT366DB,112 in SO16 package?

The 74HCT366DB,112 in SO16 (SOT109-1) package has total power dissipation (Ptot) rated at 500 mW at ≤110 °C ambient. Above 110 °C, Ptot derates linearly at 12.4 mW/K. At 125 °C ambient, maximum allowable power drops to ~481 mW. This derating ensures safe junction temperature (Tj) under continuous operation when PCB copper area and airflow are nominal.