NXP Semiconductors 74HC9114D,118

Overview

74HC9114D,118 from Nexperia is a 9-bit inverting Schmitt trigger buffer with open-drain outputs, designed for noise-immune signal conditioning and level translation in mixed-voltage digital systems. It operates from 2.0 V to 6.0 V, features TTL-compatible input thresholds, integrated input clamp diodes, and supports ambient temperatures up to +125 °C - used in industrial sensor interface and legacy bus termination circuits.

For engineers reviewing the 74HC9114D,118 datasheet, 74HC9114D,118 pinout, 74HC9114D,118 application, or 74HC9114D,118 equivalent, key selection criteria include Schmitt hysteresis width (0.5–1.1 V), open-drain output drive capability (±25 mA), propagation delay (10–165 ns depending on VCC and load), and SO20 package thermal derating above 109 °C.

Technical Context

This device implements nine independent inverting Schmitt buffers, each with hysteresis-defined positive- and negative-going input thresholds (e.g., VT+ = 2.30–4.20 V, VT− = 1.80–3.30 V at VCC = 6.0 V) to reject slow-rising noise and eliminate contact bounce artifacts. Input clamp diodes enable safe interfacing to voltages exceeding VCC when used with current-limiting resistors.

The open-drain outputs support wired-AND logic, I²C-compatible bus driving, and flexible pull-up configuration (external resistor value determines rise time and power). Static current consumption is ultra-low (ICC ≤ 160 μA at VCC = 6.0 V, −40 °C to +125 °C), and dynamic power is governed by CPD = 5 pF per buffer.

Key Specifications

Pinout & Package

74HC9114D,118 is housed in a plastic small outline package (SO20), SOT163-1 variant, with 20 leads and 7.5 mm body width. Thermal resistance θJA = 12.3 mW/K above 109 °C; maximum total power dissipation is 500 mW at Tamb ≤ 109 °C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 9-bit Schmitt buffer applications.

Compared with 74HC9114D,118, the 74HCT9114D,118 offers tighter input threshold alignment to TTL logic but sacrifices some low-VCC flexibility; the SN74LVTH162244DGGR provides greater channel density and 3-state control but removes Schmitt noise immunity and open-drain versatility essential for bus arbitration and sensor conditioning.

Availability

74HC9114D,118 is available at Aetrix Electronics and suitable for industrial sensor interface, motor control feedback, power sequencing monitoring, and legacy bus termination requiring stable component supply across extended temperature ranges.

Supply support for 74HC9114D,118 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 power MOSFET solutions for industrial, automotive, and consumer markets.

The 74HC9114 belongs to Nexperia's HC logic family - engineered for low-power, wide-supply-operation digital interfacing in harsh environments where noise immunity and voltage flexibility are critical.

FAQ

Can 74HC9114D,118 drive an LED directly?

Yes - its open-drain outputs support up to ±25 mA per channel. To drive an LED, connect the anode to a positive supply (e.g., 5 V) via a current-limiting resistor, and the cathode to a Yn output. When the input is HIGH, the output pulls LOW, lighting the LED. Ensure total package power dissipation stays below 500 mW at ambient temperature.

What is the minimum recommended pull-up resistor for Yn outputs?

The minimum pull-up resistor depends on required rise time and VCC. For VCC = 5 V and CL = 50 pF, a 1 kΩ resistor yields ~50 ns rise time; a 10 kΩ resistor yields ~500 ns. Use Equation: tr ≈ 2.2 × RPU × CL. Keep RPU ≥ VCC / 25 mA (e.g., ≥200 Ω at 5 V) to avoid exceeding output current rating during LOW transition.

Does 74HC9114D,118 support hot-swap or live-insertion?

No - it lacks explicit hot-swap protection circuitry. While input clamp diodes and latch-up immunity (≥100 mA) improve robustness, uncontrolled VCC ramp-up or floating GND during insertion can cause undefined states or excessive current. Always sequence power and ensure GND connects first in connector designs.

How does hysteresis affect performance in noisy environments?

Hysteresis (0.5–1.1 V typical) creates distinct VT+ and VT− thresholds, preventing multiple output toggles when input voltage slowly crosses the switching point due to noise or EMI. This eliminates false triggering on slow-rising signals like thermistor outputs or mechanical switch bounce - reducing firmware debounce requirements and improving real-time response fidelity.