Diodes Incorporated 74HC125S14-13

Overview

74HC125S14-13 from Diodes Incorporated is a quadruple 3-state buffer IC with independent active-low enable inputs, designed for bidirectional bus interfacing and signal isolation in digital systems operating from 2.0V to 6.0V. It provides four non-inverting buffers, each sinking or sourcing up to 4mA at V_CC = 4.5V, with Schmitt-trigger inputs for noise immunity and ESD protection exceeding 2kV HBM. It is commonly used in PC peripheral interfaces and storage device data buses.

For engineers reviewing the 74HC125S14-13 datasheet, 74HC125S14-13 pinout, 74HC125S14-13 application, or 74HC125S14-13 equivalent, key selection considerations include its 3-state output timing (t_PD ≤ 30ns @ 4.5V), input hysteresis, SO-14 package thermal profile, and compatibility with 5V/3.3V mixed-voltage logic domains.

Technical Context

The 74HC125S14-13 implements four independent CMOS buffer gates, each with a dedicated active-low 3-state enable (OE) input controlling high-impedance output state. Its Schmitt-trigger inputs provide ≥0.8V hysteresis across the full supply range, enabling robust operation in noisy environments such as motherboard I/O expansion slots.

It operates within a recommended supply range of 2.0V–6.0V and supports industrial temperature range (−40°C to +125°C). Propagation delay (t_PD) is 11ns typical at 4.5V with 50pF load, while enable/disable times (t_EN/t_DIS) are matched at 15ns typical-critical for synchronous bus arbitration in legacy parallel interfaces.

Key Specifications

Pinout & Package

74HC125S14-13 is housed in a 14-pin SOIC (SO-14) package with 1.27mm pitch, 8.6mm × 3.9mm body size, and 1.73mm max height. The package is lead-free, RoHS-compliant, and halogen-free per Diodes Inc. Green definition.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC125N and MC74HC125AD, the 74HC125S14-13 offers balanced performance: superior ESD robustness for field-replaceable modules, verified SO-14 thermal resistance (θ_JA = 130°C/W), and consistent Schmitt input thresholds across voltage and temperature - making it optimal for mixed-signal peripheral interfaces requiring reliability and noise immunity.

Availability

74HC125S14-13 is available at Aetrix Electronics and suitable for PC peripheral interfaces, hard disk drive controller buses, and notebook expansion slot logic requiring stable component supply and long-term industrial availability.

Supply support for 74HC125S14-13 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 applications.

The 74HC logic family targets cost-sensitive, high-volume digital interface applications where robustness, wide supply tolerance, and legacy compatibility are prioritized over ultra-high speed - exemplified by its use in SATA bridge controllers and embedded display timing generators.

FAQ

What is the maximum clock frequency supported by the 74HC125S14-13?

The 74HC125S14-13 is not a clocked device and has no internal clock; its usable data rate depends on propagation delay and load capacitance. With t_PD ≤ 30ns (max) and CL = 50pF, it supports reliable operation up to ~20MHz for clean toggle waveforms in bus applications, assuming proper layout and termination.

Can unused inputs be left floating?

No - unused inputs must be tied to V_CC or GND per Diodes' Recommended Operating Conditions. Floating CMOS inputs cause increased ICC, potential oscillation, and susceptibility to ESD-induced latch-up due to undefined threshold crossing in Schmitt-trigger stages.

Is the 74HC125S14-13 compatible with 5V TTL logic levels?

Yes - VIH(min) = 3.15V and VIL(max) = 1.35V at V_CC = 4.5V meet standard TTL input thresholds. Outputs swing rail-to-rail (VOH ≥ 4.4V, VOL ≤ 0.33V), providing adequate noise margin for TTL loads when V_CC ≥ 4.5V.

Does the SO-14 package support reflow soldering per J-STD-020?

Yes - Diodes' SO-14 package is rated for standard lead-free reflow profiles (peak 260°C, 10s max). The device's MSL level is 1 (unlimited floor life), and its thermal resistance (θ_JA = 130°C/W) is validated for 2-layer PCBs with 1oz copper and 100mm² pad area.