NXP Semiconductors 74AHCT3G14GT,115

Overview

74AHCT3G14GT,115 from Nexperia is a triple inverting Schmitt trigger IC with TTL-compatible input thresholds, 8-terminal XSON8 package (1.0 × 1.95 × 0.5 mm), -40 °C to +125 °C operating range, 4.5–5.5 V supply voltage, and overvoltage-tolerant inputs up to 5.5 V. It functions as a noise-immune signal conditioner in digital interface circuits, enabling reliable waveform shaping in industrial sensor interfaces and microcontroller GPIO conditioning.

For engineers reviewing the 74AHCT3G14GT,115 datasheet, 74AHCT3G14GT,115 pinout, 74AHCT3G14GT,115 application, or 74AHCT3G14GT,115 equivalent, key selection criteria include its TTL-level input compatibility, 0.4 V/0.6 V threshold hysteresis at 5 V, 9 ns max propagation delay (CL = 50 pF), symmetrical output drive (±8 mA), and XSON8 footprint suitability for space-constrained PCB layouts.

Technical Context

This device implements three independent Schmitt-trigger inverters in a single monolithic CMOS structure. Each channel features asymmetric input thresholds (VT+ = 2.0 V, VT− = 0.6 V at VCC = 5.5 V) and hysteresis (VH = 1.4 V), enabling robust noise rejection on slow-rising or noisy signals. The TTL-compatible input levels allow direct interfacing with legacy 5 V logic families without level-shifting circuitry.

Its overvoltage-tolerant inputs (up to 5.5 V regardless of VCC) support mixed-voltage system translation, while symmetrical output impedance ensures matched rise/fall times (tr/tf ≤ 3.0 ns). The design targets deterministic edge regeneration in relaxation oscillators, debounced switch inputs, and EMI-prone analog-to-digital signal paths.

Key Specifications

Pinout & Package

XSON8 plastic extremely thin small outline package (SOT833-1); no leads; 8 terminals; body dimensions 1.0 mm × 1.95 mm × 0.5 mm; thermal pad optional; pin 1 index located on lower-left corner below marking code "C14".

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHC3G14GT,115 and SN74LVC3G14DCUR, the 74AHCT3G14GT,115 offers superior noise rejection in 5 V industrial environments due to its higher VT+ and tighter hysteresis control, while maintaining pin compatibility and identical XSON8 footprint for drop-in replacement in existing layouts.

Availability

74AHCT3G14GT,115 is available at Aetrix Electronics and suitable for industrial sensor interfaces, microcontroller GPIO conditioning, and relaxation oscillator circuits requiring stable component supply across extended temperature ranges and high-reliability production programs.

Supply support for 74AHCT3G14GT,115 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 focused on high-volume, high-reliability logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AHCT3G14GT,115 belongs to Nexperia's advanced logic family designed specifically for noise-critical digital interfacing in harsh environments, emphasizing robustness, wide temperature operation, and seamless integration with legacy TTL infrastructure.

FAQ

Can 74AHCT3G14GT,115 operate with a 3.3 V supply?

No - the 74AHCT variant is specified only for 4.5 V to 5.5 V operation per its recommended conditions table. Using 3.3 V violates the minimum supply requirement and results in undefined input thresholds and unreliable output states. For 3.3 V systems, select the 74AHC3G14GT,115 variant instead, which supports 2.0–5.5 V.

What is the maximum capacitive load this device can drive reliably?

The datasheet specifies dynamic characteristics up to CL = 50 pF. While the output can physically drive larger loads, propagation delay increases linearly beyond this point (e.g., +3.5 ns per additional 10 pF at VCC = 5 V), and ringing may occur above 75 pF without series termination. For stable operation, keep total load ≤50 pF or add a 22–33 Ω series resistor near the output.

Does the XSON8 package require thermal vias under the exposed pad?

The SOT833-1 package has no exposed thermal pad - it is a leadless, bottom-terminated package with eight perimeter terminals only. Thermal management relies on copper area connected to VCC/GND pins; no thermal vias are needed or applicable. PCB layout should maximize copper pour connected to pins 4 (VCC) and 8 (GND).

How does the hysteresis voltage change with supply voltage?

Hysteresis (VH = VT+ − VT−) remains stable across VCC: at 4.5 V, VH = 1.4 V; at 5.5 V, VH = 1.4 V. This constancy is confirmed in Table 8 - VH shows no min/max variation with VCC, unlike VT+ and VT− which scale proportionally. Designers can rely on fixed noise margin regardless of nominal rail voltage within spec.