onsemi MC74LCX14MELG

Overview

MC74LCX14MELG from onsemi is a low-voltage CMOS hex Schmitt-trigger inverter operating from 1.65 V to 5.5 V, featuring 5.0 V-tolerant inputs, 24 mA balanced output drive, and hysteresis-enabled noise immunity for slow or noisy signal conditioning. It serves as a robust line receiver or waveform squaring element in mixed-voltage digital interfaces.

For engineers reviewing the MC74LCX14MELG datasheet, pinout, applications, or equivalent options, this device is selected for level-shifting, input debouncing, clock conditioning, and legacy TTL-to-LVCMOS interfacing where supply voltage flexibility and input hysteresis are critical.

Technical Context

The MC74LCX14MELG implements six independent Schmitt-trigger inverters with asymmetric input thresholds (VT+ = 1.2–3.6 V, VT− = 0.2–1.2 V at VCC = 1.65–5.5 V), delivering 0.7–1.7 V hysteresis. Its 5.5 V absolute maximum input rating enables safe interfacing with 5 V TTL logic while powered from 1.65–3.3 V supplies.

Each inverter provides rail-to-rail CMOS-compatible outputs with ±24 mA drive capability, near-zero quiescent current (10 µA typical), and dynamic switching performance down to 5.6 ns propagation delay (VCC = 4.5–5.5 V). Input capacitance is 7 pF and output capacitance is 8 pF at 25 °C.

Key Specifications

Pinout & Package

TSSOP-14 package (Case 948G), 4.9 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, Pb-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC14APWR and 74AHC14PW,118, the MC74LCX14MELG uniquely guarantees 5.0 V input tolerance across its entire 1.65–5.5 V supply range-enabling simpler, more robust mixed-voltage interface designs without supply dependency constraints.

Availability

MC74LCX14MELG is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB power management, low-power IoT timing, and legacy bus bridging requiring stable component supply and long-term manufacturability.

Supply support for MC74LCX14MELG 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 technologies for automotive, industrial, and cloud infrastructure markets.

The MC74LCX14MELG belongs to the LCX low-voltage logic family, designed specifically for mixed-supply systems requiring interoperability between 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains with robust noise immunity.

FAQ

What is the maximum input voltage rating for MC74LCX14MELG?

The MC74LCX14MELG has a DC input voltage rating of −0.5 V to +6.5 V, with guaranteed 5.0 V tolerance across its full 1.65–5.5 V supply range. This allows safe interfacing with 5 V TTL outputs even when the device is powered from 1.8 V or 2.5 V, eliminating the need for external level shifters in mixed-voltage systems.

Does MC74LCX14MELG support true Schmitt-trigger behavior across all supply voltages?

Yes, the MC74LCX14MELG delivers verified Schmitt-trigger functionality across its entire 1.65–5.5 V VCC range, with hysteresis voltage (VH) ranging from 0.1 V to 1.7 V depending on supply. Thresholds VT+ and VT− scale predictably with VCC, ensuring consistent noise margin and edge discrimination at 1.8 V, 2.5 V, 3.3 V, and 5 V operation.

What is the typical propagation delay of MC74LCX14MELG at 3.3 V supply?

At VCC = 3.3 V and TA = +25 °C, the MC74LCX14MELG exhibits a typical propagation delay of 6.5 ns (tPLH/tPHL), with a maximum of 6.5 ns over −40 °C to +125 °C. This performance enables reliable use in clock conditioning, data recovery, and high-speed debounce applications up to ~150 MHz effective edge rate.

Can MC74LCX14MELG drive standard LVTTL loads?

Yes, the MC74LCX14MELG provides ±24 mA output drive capability, exceeding the LVTTL specification (±8 mA) and supporting fan-out of ≥10 LVTTL inputs at 3.3 V. Its rail-to-rail CMOS-compatible outputs ensure full logic swing and noise margin compatibility with downstream LVTTL receivers.

Is MC74LCX14MELG pin-compatible with other hex inverters like MC74LCX04?

Yes, the MC74LCX14MELG shares identical pin configuration and function with the MC74LCX04, differing only in input hysteresis. Pin 1–14 mapping (A1–A6 inputs, Y1–Y6 outputs, VCC, GND) is identical, allowing drop-in replacement where Schmitt-trigger behavior is needed-no PCB layout changes required.