onsemi MC74LCX06D

Overview

MC74LCX06D from onsemi is a low-voltage CMOS hex inverter with open-drain outputs and 5 V-tolerant inputs, operating from 1.65 V to 5.5 V supply. It delivers 24 mA sink capability at 3.0 V, supports wired-OR/AND logic functions, and features near-zero static supply current (10 µA). It is used in level-shifting interfaces between mixed-voltage systems such as 3.3 V microcontrollers driving 5 V peripherals.

For engineers reviewing the MC74LCX06D datasheet, pinout, applications, or equivalent options, key selection criteria include open-drain output configuration, 5 V input tolerance, propagation delay ≤3.2 ns at 5 V, SOIC-14 package compatibility, and LVTTL/LVCMOS interoperability in multi-rail digital systems.

Technical Context

The MC74LCX06D implements six independent inverting buffers with high-impedance TTL-compatible inputs and open-drain NMOS outputs. Its VIH/VIL thresholds scale with VCC (e.g., VIH = 0.7×VCC at 4.5–5.5 V), enabling robust interfacing across 1.65–5.5 V logic domains. Input leakage remains ≤±5 µA over full temperature range.

Each output supports active-low OR and wired-AND configurations via external pull-up; output voltage swing is externally defined without impacting propagation delay. The device exhibits latchup immunity >100 mA and ESD robustness >2000 V HBM, meeting industrial reliability requirements.

Key Specifications

Pinout & Package

MC74LCX06D is supplied in a 14-lead SOIC-14 package (Case 751A), with 1.27 mm pitch, 8.75 mm × 3.9 mm body size, and Pb-free (G) finish. Pin 1 is index-marked; pin 7 is GND and pin 14 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC06A and 74AHC06, the MC74LCX06D uniquely supports full 5 V operation *and* 5 V input tolerance simultaneously, making it the only option among the three qualified for true mixed-supply environments where 5 V signals drive a sub-5 V powered device.

Availability

MC74LCX06D is available at Aetrix Electronics and suitable for industrial automation interfaces, automotive body control modules, and IoT sensor hub designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MC74LCX06D 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 MC74LCX06D belongs to the LCX low-voltage logic family, designed specifically for interoperability across 1.65–5.5 V mixed-rail digital systems-emphasizing voltage translation, low static power, and robust I/O tolerance in space-constrained embedded applications.

FAQ

What is the maximum supply voltage for MC74LCX06D?

The MC74LCX06D supports a DC supply voltage (VCC) from −0.5 V to +6.5 V absolute maximum, but its recommended operating range is 1.65 V to 5.5 V. Operation above 5.5 V risks parametric degradation and reduced reliability, even though the absolute rating permits brief excursions to 6.5 V under non-operational conditions. Always maintain VCC within 1.65–5.5 V during active use to ensure guaranteed timing, logic thresholds, and output drive performance for MC74LCX06D.

Does MC74LCX06D support true 5 V operation on both inputs and supply?

Yes - MC74LCX06D operates with VCC up to 5.5 V and accepts input voltages up to 5.5 V regardless of VCC level, including when VCC = 1.65 V. This dual 5 V tolerance enables reliable interfacing between 5 V legacy components and sub-3.3 V logic domains without external protection. The MC74LCX06D datasheet explicitly confirms VI = −0.5 V to +6.5 V and VCC = 1.65 V to 5.5 V as concurrent specifications.

Can MC74LCX06D outputs be wire-OR'd together?

Yes - all six outputs of MC74LCX06D are open-drain, allowing multiple outputs to share a common pull-up resistor and form a wired-OR (active-low) or wired-AND (active-high) node. This is explicitly supported per the datasheet's "Wired-OR, Wired-AND" feature and Figure 2 logic diagram. No additional components or isolation are needed, and propagation delay remains unaffected by external pull-up value within specified loading limits for MC74LCX06D.

What is the typical propagation delay of MC74LCX06D at 3.3 V?

At VCC = 3.0–3.6 V and TA = −40 °C to +85 °C, the MC74LCX06D exhibits a maximum propagation delay (tPLZ/tPZL) of 3.7 ns. This value is measured from input transition to output transition under loaded conditions (CL = 50 pF), and represents worst-case delay across temperature and process corners. Typical delay is lower, but design margins should use the 3.7 ns max for timing closure in synchronous control paths using MC74LCX06D.

Is MC74LCX06D pin-compatible with other hex inverters like 74HC06?

No - MC74LCX06D uses the same 14-pin SOIC layout as standard hex inverters (pin 1 = A0, pin 2 = O0, etc.), but differs electrically: 74HC06 has push-pull outputs and no 5 V input tolerance when VCC < 5 V. While physical pinout matches, substituting 74HC06 for MC74LCX06D will cause functional failure in open-drain or level-shift applications. Always verify output structure and voltage ratings before replacement - MC74LCX06D is not a drop-in substitute for 74HC06.