NXP Semiconductors 74HCT14D/C4118

Overview

74HCT14D/C4118 from Nexperia is a hex inverting Schmitt trigger IC designed for digital signal conditioning in TTL-level interfacing applications. It features six independent Schmitt-trigger inverters with hysteresis (V_H = 0.4 V min at V_CC = 4.5 V), operates from 4.5 V to 5.5 V, and delivers propagation delay of 20 ns typical (V_CC = 4.5 V, C_L = 50 pF). It is used in waveform shaping circuits where noise immunity and clean edge regeneration are required.

For engineers reviewing the 74HCT14D/C4118 datasheet, 74HCT14D/C4118 pinout, 74HCT14D/C4118 application, or 74HCT14D/C4118 equivalent, this device is selected when precise TTL-compatible threshold levels (V_T+ = 1.2 V min, V_T− = 0.5 V max at V_CC = 4.5 V), low static current (I_CC ≤ 40 μA at −40 °C to +125 °C), and robust ESD protection (HBM > 2000 V) are critical for reliable input signal cleanup in industrial control and sensor interface systems.

Technical Context

The 74HCT14D/C4118 implements six independent CMOS Schmitt-trigger inverters with TTL-compatible input thresholds-V_T+ = 1.2–1.9 V and V_T− = 0.5–1.2 V across V_CC = 4.5–5.5 V-enabling direct connection to legacy TTL outputs without level-shifting. Its input clamp diodes allow safe interfacing to voltages exceeding V_CC when used with current-limiting resistors.

Each inverter provides sharp output transitions (t_t = 7–15 ns typical) and jitter-free output generation from slowly varying inputs. The device complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), supports unlimited input rise/fall times, and exhibits latch-up immunity >100 mA per JESD78 Class II Level B.

Key Specifications

Pinout & Package

74HCT14D/C4118 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width. The package is RoHS-compliant, surface-mountable, and rated for operation from −40 °C to +125 °C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC14D and SN74LV14APW, the 74HCT14D/C4118 provides optimal balance of TTL-level compatibility, industrial temperature support, and low static power-making it the preferred choice for legacy 5 V digital systems requiring robust noise immunity without redesigning supply or interface networks.

Availability

74HCT14D/C4118 is available at Aetrix Electronics and suitable for industrial control panels, sensor interface modules, and embedded power management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74HCT14D/C4118 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 specializing in high-performance, energy-efficient logic, analog, and discrete components for automotive, industrial, and consumer applications.

The 74HCT14D/C4118 belongs to Nexperia's industry-standard 74HCT logic family, engineered specifically for seamless interoperability with legacy TTL systems while delivering CMOS power efficiency and robustness in harsh environments.

FAQ

What is the maximum supply voltage rating for the 74HCT14D/C4118?

The absolute maximum supply voltage (V_CC) for the 74HCT14D/C4118 is +7.0 V, but the recommended operating range is strictly 4.5 V to 5.5 V. Operation above 5.5 V risks violating the TTL input compatibility specification and may increase static current beyond datasheet limits. Always use a regulated 5 V source with local 100 nF decoupling for reliable performance of the 74HCT14D/C4118.

Does the 74HCT14D/C4118 support operation at −40 °C to +125 °C?

Yes, the 74HCT14D/C4118 is fully specified and tested for operation across −40 °C to +125 °C ambient temperature. All key parameters-including propagation delay, threshold voltages, and supply current-are guaranteed within this range per the Nexperia datasheet Rev. 10. This makes the 74HCT14D/C4118 suitable for under-hood automotive modules, industrial motor drives, and outdoor equipment where thermal extremes occur.

Can the 74HCT14D/C4118 safely interface with 12 V signals?

Yes-the 74HCT14D/C4118 includes input clamp diodes that allow safe interfacing with voltages exceeding V_CC, provided an external current-limiting resistor is used. For a 12 V source, a 10 kΩ resistor limits input current to <1 mA, keeping it within the ±20 mA clamp rating. This capability enables direct connection to 12 V sensors or industrial I/O without level-shifter ICs-critical for compact 74HCT14D/C4118-based designs.

What is the typical propagation delay of the 74HCT14D/C4118 at 5 V supply?

At V_CC = 5.0 V with C_L = 15 pF, the 74HCT14D/C4118 exhibits a typical propagation delay (t_pd) of 17 ns, as confirmed in Table 7 of the Nexperia datasheet. At the more common 50 pF load and 4.5 V supply, the typical delay is 20 ns. These values are measured between 10 %/90 % points and include both t_PLH and t_PHL; actual system delay depends on trace capacitance and loading, so the 74HCT14D/C4118 should be characterized in situ for timing-critical paths.

Is the 74HCT14D/C4118 pin-compatible with other 74-series hex Schmitt triggers?

Yes-the 74HCT14D/C4118 uses the industry-standard SO14 (SOT108-1) pinout defined in JEDEC MS-012, matching 74HC14D, 74LV14APW, and SN74LVC14APW. Pin 1 is input 1A, pin 2 is output 1Y, ..., pin 7 is GND, pin 14 is V_CC. This allows drop-in replacement in existing layouts when migrating between HCT, HC, or LV families-provided voltage and timing requirements align. Always verify threshold and drive specs before substituting the 74HCT14D/C4118.