Diodes Incorporated 74AHC125S14-13

Overview

74AHC125S14-13 from Diodes Incorporated is a quadruple 3-state buffer IC with independent active-low enable inputs, designed for voltage-level translation and bus isolation in mixed-supply systems. It operates from 2.0V to 5.5V, supports 5.5V-tolerant inputs, delivers ±8mA output drive at 4.5V, and features Schmitt-trigger inputs for noise immunity-used in PC peripheral interfaces and set-top box data buses.

For engineers reviewing the 74AHC125S14-13 datasheet, 74AHC125S14-13 pinout, 74AHC125S14-13 application, or 74AHC125S14-13 equivalent, key selection criteria include 3-state timing (tEN ≤ 7.5 ns @ 5V), input voltage tolerance (up to 5.5V), leakage current (±2.5 µA max), and SO-14 package compatibility with legacy 74-series footprints.

Technical Context

This device implements four non-inverting buffer gates, each with dedicated active-low 3-state enable (OE) control, enabling independent bus segment management. All inputs incorporate Schmitt-trigger action, providing hysteresis (typically 0.3V) for robust signal integrity in noisy environments.

It supports dual-voltage operation: logic inputs accept 3.3V or 5.5V signals while powered from as low as 2.0V, making it suitable for level-shifting between 3.3V controllers and 5V peripherals. Propagation delay is specified down to 3.0 ns (typical, CL = 15 pF, VCC = 5V).

Key Specifications

Pinout & Package

74AHC125S14-13 is housed in a 14-pin SOIC (SO-14) package with 1.27 mm pitch, 8.6 mm × 3.9 mm body, and gull-wing leads compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHC125DR and 74LVC125APW,118, the 74AHC125S14-13 uniquely balances wide supply range (2.0–5.5V), guaranteed 5.5V input tolerance, and SO-14 availability-making it optimal for retrofitting legacy 5V systems with modern low-voltage controllers.

Availability

74AHC125S14-13 is available at Aetrix Electronics and suitable for PC peripheral interfaces, set-top box bus isolation, and industrial PLC I/O expansion requiring stable component supply and long-term manufacturability.

Supply support for 74AHC125S14-13 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, industry-qualified components for computing, industrial, and consumer markets.

The 74AHC logic family targets cost-sensitive, mixed-voltage digital interface applications-designed for robustness in commercial and extended temperature environments without sacrificing speed or power efficiency.

FAQ

Can 74AHC125S14-13 operate reliably at 2.0V supply while driving 5.5V-tolerant inputs?

Yes. The device guarantees full functionality-including VIH/VIL thresholds, tPD, and output drive-at VCC = 2.0V. Its 5.5V-tolerant inputs remain valid regardless of VCC level, enabling safe connection to higher-voltage signal sources without damage or logic misinterpretation.

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

The datasheet specifies switching characteristics up to CL = 50 pF. At VCC = 5V, tPD remains within 7.5 ns (max) and tEN/tDIS within 9.0 ns (max) under this load. For heavier loads (>50 pF), propagation delay increases linearly; derating beyond 100 pF requires empirical validation.

Does the SO-14 package of 74AHC125S14-13 support lead-free reflow soldering?

Yes. The part is fully RoHS-compliant and lead-free, qualified for standard Pb-free reflow profiles (J-STD-020D). Peak temperature tolerance is rated to 260°C for 10 seconds, matching IPC/JEDEC specifications for SOIC packages.

How does Schmitt-trigger action improve noise immunity in real-world PCB layouts?

Schmitt-trigger inputs provide ~0.3V hysteresis between rising and falling thresholds, rejecting noise spikes smaller than this window. This prevents multiple transitions on slow-rising clock or enable signals caused by crosstalk, ground bounce, or long trace ringing-critical in dense mixed-signal boards.