onsemi 74HCT14DR2G

Overview

74HCT14DR2G from onsemi is a hex Schmitt-trigger inverter IC with LSTTL-compatible inputs, operating at 4.5–5.5 V, providing 10 LSTTL load drive capability and 0.4–1.5 V hysteresis voltage for noise immunity. It functions as a level converter between TTL/NMOS outputs and high-speed CMOS inputs and is used to square slow input edges in industrial control timing circuits.

For engineers reviewing the 74HCT14DR2G datasheet, pinout, applications, or equivalent options, key selection criteria include its guaranteed hysteresis (0.4–1.5 V), propagation delay ≤48 ns at 125°C, SOIC-14 Pb-free package, and compliance with JEDEC Std. 7A for TTL-level interfacing.

Technical Context

The 74HCT14DR2G implements six independent Schmitt-trigger inverters using high-performance silicon-gate CMOS technology. Each channel features asymmetric input thresholds (VTmin = 0.5–0.6 V, VTmax = 1.9–2.1 V) enabling robust noise rejection in environments with EMI or signal integrity issues.

It operates strictly within 4.5–5.5 V supply range with quiescent ICC ≤40 µA at 125°C and supports direct interface to CMOS, NMOS, and TTL logic families without external level-shifting components.

Key Specifications

Pinout & Package

74HCT14DR2G is housed in a Pb-free SOIC-14 (Case 751A) package measuring 8.75 × 4.00 × 1.75 mm, with standard 1.27 mm pitch and gull-wing leads suitable for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT14N and MC74HCT14AD, the 74HCT14DR2G offers superior thermal performance in surface-mount layouts, guaranteed Pb-free compliance for modern manufacturing, and ongoing supply chain support - making it the optimal choice for volume industrial production.

Availability

74HCT14DR2G is available at Aetrix Electronics and suitable for industrial switch debouncing, waveform squaring, and TTL-to-CMOS level translation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for 74HCT14DR2G 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, sensing, and logic solutions for automotive, industrial, and cloud infrastructure markets.

The 74HCT14DR2G belongs to the HCT logic family designed specifically for TTL-compatible interfacing in mixed-technology systems, emphasizing robustness, low power, and industrial-grade reliability.

FAQ

What is the maximum operating temperature for the 74HCT14DR2G?

The 74HCT14DR2G is rated for continuous operation from −55°C to +125°C across all package types. Its guaranteed AC performance (e.g., propagation delay ≤48 ns) is specified up to 125°C, making it suitable for under-hood automotive modules and industrial motor control enclosures where ambient temperatures exceed 85°C.

Does the 74HCT14DR2G require external pull-up or pull-down resistors on unused inputs?

Yes - the 74HCT14DR2G datasheet explicitly states that unused inputs must not be left open. Each unconnected input must be tied to either VCC or GND to prevent floating nodes, which could cause excessive ICC current, erratic output behavior, or increased susceptibility to EMI. This requirement applies to all six inverters in the 74HCT14DR2G package.

Can the 74HCT14DR2G drive a 50 pF capacitive load at full speed?

Yes - the 74HCT14DR2G's AC characteristics are tested and guaranteed with CL = 50 pF and input rise/fall times of 6.0 ns. Its maximum propagation delay remains ≤48 ns at 125°C under these conditions, confirming reliable operation into typical PCB trace and gate-input capacitances found in industrial control logic networks.

Is the 74HCT14DR2G pin-compatible with the 74LS14?

No - while both are hex Schmitt-trigger inverters, the 74HCT14DR2G uses CMOS output stages with rail-to-rail swing (VOH ≥4.4 V, VOL ≤0.1 V), whereas the 74LS14 has bipolar TTL outputs (VOH ≈2.7 V, VOL ≈0.5 V). Their input thresholds also differ: 74HCT14DR2G accepts LSTTL levels but does not replicate the 74LS14's exact VIH/VIL, so direct substitution may cause logic-level incompatibility.

What is the purpose of the hysteresis in the 74HCT14DR2G?

The hysteresis in the 74HCT14DR2G creates two distinct input threshold voltages (VTmin ≈0.5–0.6 V for negative-going edges; VTmax ≈1.9–2.1 V for positive-going edges), resulting in a 0.4–1.5 V noise margin. This prevents multiple output transitions when input signals cross the threshold slowly or contain noise - a critical feature for debouncing switches or cleaning up sensor outputs in the 74HCT14DR2G.