NXP Semiconductors 74HC9115N,112

Overview

74HC9115N,112 from Nexperia is a nine-channel non-inverting Schmitt trigger buffer with open-drain N-channel MOSFET outputs, designed for signal conditioning and level shifting in digital interface circuits. It operates from 2.0 V to 6.0 V, delivers 12 ns typical propagation delay at 5 V, supports 3.5 pF input capacitance, and enables OR-wired logic or bidirectional level translation via external pull-up. It is used in industrial control I/O expansion where noise-immune signal buffering is required.

For engineers reviewing the 74HC9115N,112 datasheet, 74HC9115N,112 pinout, 74HC9115N,112 application, or 74HC9115N,112 equivalent, key selection criteria include Schmitt-trigger hysteresis (min. 0.4 V at 4.5 V), open-drain output voltage tolerance (up to VOmax), input threshold symmetry (VT+ = 1.75 V / VT− = 1.35 V typ. at VCC = 4.5 V), and compatibility with 74HCT logic families.

Technical Context

The 74HC9115N,112 implements nine independent Schmitt-trigger input stages feeding open-drain NMOS output transistors without internal VCC clamping diodes. Each channel provides hysteresis of 0.4 V (typ.) at 4.5 V supply, enabling reliable digitization of slow or noisy analog-like signals such as rotary encoder waveforms or mechanical switch bounce.

Its open-drain architecture allows output voltages up to VOmax (typically 6.0 V) independent of VCC, supporting HIGH-to-LOW and LOW-to-HIGH level shifting when paired with external pull-ups. The device is specified per JEDEC Standard No. 7A and exhibits MSI-level quiescent current consumption.

Key Specifications

Pinout & Package

74HC9115N,112 is supplied in a 20-pin dual in-line package (DIP) with 0.3-inch body width and through-hole mounting. Pin 10 is GND; Pin 20 is VCC; Inputs A0–A8 occupy pins 1–9; Outputs Y0–Y8 occupy pins 11–19 in reverse order (Y0 = pin 19, Y8 = pin 11).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74HC9115N,112, the 74HC9114N,112 offers identical performance with inverted outputs-ideal for complemented logic paths-while the SN74LVTH162244DGGR trades Schmitt noise immunity and open-drain flexibility for higher channel density and 3.3 V optimization, requiring layout and voltage-domain changes.

Availability

74HC9115N,112 is available at Aetrix Electronics and suitable for industrial control systems, encoder interfaces, wired-OR bus designs, and legacy TTL upgrades requiring stable component supply and long-term sourcing assurance.

Supply support for 74HC9115N,112 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 leader in high-volume production of logic, discrete, and power MOSFET semiconductors, serving automotive, industrial, computing, and consumer markets with AEC-Q101 qualified components and robust supply chain infrastructure.

The 74HC9115N,112 belongs to Nexperia's 74HC/HCT logic family, engineered for drop-in replacement of legacy TTL buffers while delivering lower power, wider supply range, and enhanced noise immunity in industrial and automation applications.

FAQ

What is the maximum allowable output voltage (VOmax) for 74HC9115N,112?

The 74HC9115N,112 supports VOmax = 6.0 V, meaning its open-drain outputs can be safely pulled up to any voltage between GND and 6.0 V-even when VCC is lower (e.g., 3.3 V). This enables level shifting between disparate voltage domains. The 74HC9115N,112 datasheet specifies this limit under absolute maximum ratings, and exceeding it risks permanent damage to the output transistors.

Does 74HC9115N,112 require external pull-up resistors on its outputs?

Yes, 74HC9115N,112 requires external pull-up resistors on all Y0–Y8 outputs to establish a valid HIGH logic level, because its outputs are open-drain NMOS structures with no internal pull-up. The resistor value must balance speed (lower R) against power (higher R); typical values range from 1 kΩ to 10 kΩ depending on bus capacitance and rise-time requirements. Without pull-ups, outputs remain floating in the HIGH state.

How does the Schmitt trigger hysteresis of 74HC9115N,112 improve noise immunity?

The 74HC9115N,112 provides ≥0.4 V hysteresis (VT+ − VT−) at 4.5 V, creating two distinct input thresholds: 1.75 V for rising edges and 1.35 V for falling edges. This prevents multiple toggles when input signals cross a single threshold amid noise. For example, a 1.5 V input with ±300 mV ripple stays within the hysteresis window and produces one clean output transition-critical for switch debouncing or encoder signal integrity. The 74HC9115N,112 achieves this without external components.

Is 74HC9115N,112 pin-compatible with 74HCT9115N,112?

Yes, 74HC9115N,112 and 74HCT9115N,112 share identical pinout, package, and logic function-but differ in input threshold compatibility: 74HC9115N,112 accepts VI = GND to VCC, while 74HCT9115N,112 matches TTL input levels (VI = GND to VCC −1.5 V). Thus, 74HC9115N,112 works directly with CMOS outputs, whereas 74HCT9115N,112 better interfaces with legacy TTL drivers. Both operate identically otherwise.

Can 74HC9115N,112 be used for bidirectional level shifting?

No, 74HC9115N,112 supports unidirectional level shifting only-from low-voltage logic (e.g., 3.3 V VCC) to higher-voltage buses (e.g., 5 V pull-up)-because its inputs are referenced to VCC and cannot tolerate voltages above VCC +0.5 V. For true bidirectional translation (e.g., I²C), dedicated bus switches like NXB0108 are required. The 74HC9115N,112 is optimized for output-side voltage translation with Schmitt-triggered inputs.