Diodes Incorporated 74AHC126S14-13

Overview

74AHC126S14-13 from Diodes Incorporated is a quadruple 3-state non-inverting buffer IC with independent active-high enable inputs, operating across 2.0V–5.5V supply, delivering ±8mA drive at 4.5V, featuring Schmitt-trigger inputs for noise immunity and 5.5V-tolerant inputs enabling mixed-voltage interfacing in logic-level translation applications.

For engineers reviewing the 74AHC126S14-13 datasheet, 74AHC126S14-13 pinout, 74AHC126S14-13 application, or 74AHC126S14-13 equivalent, this device serves as a voltage-translating bus interface buffer with fast propagation delay (3.0 ns typ @ 5V), low power CMOS operation, and robust ESD protection-key selection criteria for industrial control I/O expansion and embedded system data path isolation.

Technical Context

The 74AHC126 implements four independent non-inverting buffers, each with dedicated active-high 3-state enable (OE) controlling high-impedance output states. All inputs incorporate Schmitt-trigger action, providing hysteresis of ~0.3V at 3.3V and improving noise margin in noisy digital environments.

It supports bidirectional voltage translation: 3.3V outputs interface safely with 5V-tolerant inputs, while 5V signals can drive its inputs directly without level-shifting circuitry. Propagation delay is specified down to 3.0 ns (typ, VCC = 5V, CL = 15 pF), and disable time is 4.8 ns (typ) ensuring tight timing control in synchronous bus architectures.

Key Specifications

Pinout & Package

74AHC126S14-13 is housed in a 14-pin SOIC (SO-14) package with 1.27 mm pitch, 8.6 mm × 3.9 mm body size, and gull-wing leads compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHC126DR and 74LVC126APW,118, the 74AHC126S14-13 uniquely balances wide supply range, 5.5V-tolerant inputs, and industrial-grade ESD-making it the sole option among the three qualified for mixed-voltage industrial control and automotive subsystem interfaces.

Availability

74AHC126S14-13 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded system bus isolation, and automotive infotainment subsystem interface applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for 74AHC126S14-13 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, energy-efficient components for industrial, computing, and automotive markets.

The 74AHC logic family targets robust, low-power digital interfacing-designed specifically for voltage translation, bus buffering, and noise-immune signal conditioning in mission-critical embedded systems.

FAQ

Can 74AHC126S14-13 operate reliably at 2.0V supply?

Yes. The device is fully specified from 2.0V to 5.5V, with guaranteed VIH/VIL thresholds, propagation delay (8.0 ns max @ 2.0V), and output drive (±2.5 mA min) across the entire range. It meets all AC/DC parameters at 2.0V per DS35346 Rev. 4–2, making it suitable for ultra-low-voltage battery-powered systems.

Is the SO-14 package of 74AHC126S14-13 compatible with standard reflow soldering profiles?

Yes. The SO-14 package complies with IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) 1 and supports peak reflow temperatures up to 260°C. Its thermal profile aligns with standard SnPb and lead-free processes, and the 1.27 mm pitch ensures compatibility with automated placement and inspection equipment.

What is the maximum capacitive load this buffer can drive while maintaining timing specs?

The datasheet specifies switching characteristics up to 50 pF load capacitance. At CL = 50 pF and VCC = 5V, tPD remains ≤7.5 ns (max), tEN ≤7.5 ns, and tDIS ≤9.0 ns. Driving >50 pF may increase delay and reduce noise margin but does not damage the device-external series termination is recommended beyond this limit.

Do unused inputs require external pull-up or pull-down resistors?

Yes. Per Recommended Operating Conditions (Note 5), unused inputs must be held at VCC or GND to prevent floating nodes that cause increased ICC, oscillation, or ESD susceptibility. A 10 kΩ pull-up to VCC is typical for OE pins; pull-downs are acceptable for A inputs if active-low logic is needed elsewhere in the design.