Nexperia USA Inc. 74AHC126D,118

Overview

74AHC126D,118 from Nexperia is a quad CMOS buffer/line driver with 3-state outputs, designed for bidirectional bus interfacing and level translation in mixed-voltage systems. It features overvoltage-tolerant inputs (up to 7.0 V), Schmitt-trigger input action, and operates from 2.0 V to 5.5 V supply. Each of its four channels has independent active-HIGH output enable (nOE), enabling precise bus control in industrial I/O expanders and microcontroller peripheral interfaces.

For engineers reviewing the 74AHC126D,118 datasheet, 74AHC126D,118 pinout, 74AHC126D,118 application, or 74AHC126D,118 equivalent, key selection criteria include propagation delay (≤5.5 ns at VCC = 5 V, CL = 15 pF), 3-state enable/disable timing (ten ≤6.5 ns, tdis ≤9.5 ns), input voltage tolerance beyond VCC, and SO14 package compatibility with legacy PCB footprints.

Technical Context

The 74AHC126D implements four independent non-inverting buffers, each with an active-HIGH output enable input controlling high-impedance state on the corresponding output. Its inputs accept voltages up to 7.0 V regardless of VCC, enabling use as a level translator between 3.3 V logic and 5 V or higher domains.

All inputs incorporate Schmitt-trigger action for noise immunity and clean signal regeneration, while static characteristics guarantee VIH ≥3.85 V and VIL ≤1.65 V at VCC = 5.5 V - meeting standard CMOS logic thresholds. The device is specified across -40 °C to +125 °C and supports dynamic operation up to 100 MHz under typical load conditions.

Key Specifications

Pinout & Package

74AHC126D,118 is housed in a plastic small outline package (SO14) per SOT108-1, with 14 leads, 3.9 mm body width, and standard 1.27 mm lead pitch. Pin 1 is marked by a beveled corner or notch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 3-state buffer applications.

Compared with 74AHCT126D,118, the 74AHC126D,118 offers superior noise immunity and voltage translation capability; compared with SN74LVC126APWR, it trades lower drive strength for broader voltage interoperability and industrial temperature support.

Availability

74AHC126D,118 is available at Aetrix Electronics and suitable for industrial automation, embedded control, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC126D,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 delivering high-performance logic, analog, and MOSFET solutions with emphasis on reliability, efficiency, and manufacturability for industrial and automotive markets.

The 74AHC126D,118 belongs to Nexperia's AHC logic family, engineered for low-power, high-speed CMOS operation with enhanced input ruggedness - specifically targeting robust digital interfacing in harsh environments.

FAQ

Can 74AHC126D,118 safely interface a 5 V sensor output to a 3.3 V microcontroller?

Yes. Its inputs tolerate up to 7.0 V regardless of VCC, so with VCC = 3.3 V, it accepts 5 V logic-high signals without damage or external clamping. Outputs swing rail-to-rail (0 V to 3.3 V), ensuring compatible levels for the MCU's GPIO.

What is the maximum clock frequency supported for data throughput?

The device does not operate as a clocked element but as a combinatorial buffer. With tpd ≤5.5 ns (VCC = 5 V, CL = 15 pF), it supports reliable data rates up to ~100 MHz for short traces, assuming proper layout and termination to limit ringing and crosstalk.

Is the SO14 package RoHS-compliant and lead-free?

Yes. The 74AHC126D,118 in SOT108-1 (SO14) packaging meets RoHS Directive 2011/65/EU and is manufactured with lead-free terminations and halogen-free molding compound, per Nexperia's product compliance documentation.

How does the Schmitt-trigger input improve system reliability?

Schmitt-trigger action provides input hysteresis (~0.4 V typical), rejecting noise spikes and preventing false toggling on slowly transitioning or noisy control signals - critical for pushbutton debouncing, encoder inputs, and industrial fieldbus stubs.