Diodes Incorporated 74HCT125T14-13

Overview

74HCT125T14-13 from Diodes Incorporated is a quadruple 3-state buffer IC with independent active-low enable inputs, designed for bidirectional bus interfacing in 4.5V–5.5V logic systems. It provides four non-inverting buffers, each with TTL-compatible inputs, CMOS power efficiency, and ±4mA drive capability at V_CC = 4.5V. Used in PC motherboard data routing and peripheral interface control.

For engineers reviewing the 74HCT125T14-13 datasheet, 74HCT125T14-13 pinout, 74HCT125T14-13 application, or 74HCT125T14-13 equivalent, key selection criteria include 3-state output timing (t_PD ≤ 38 ns), input voltage compatibility (V_IL = 0.8V, V_IH = 2.0V), ESD robustness (2 kV HBM), and TSSOP-14 package thermal performance.

Technical Context

This device implements four independent non-inverting buffer gates, each controlled by a dedicated active-low 3-state enable input (1OE–4OE). All inputs feature Schmitt-trigger action to suppress noise on slow-rising signals, and outputs are fully specified for high-impedance (Z) state leakage (±10 µA) and rail-to-rail switching.

It operates strictly within 4.5V–5.5V supply range, with guaranteed logic thresholds aligned to TTL levels and output drive strength validated at –4mA (high) and +4mA (low). Propagation delay, enable/disable timing, and transition time are characterized across –40°C to +125°C ambient.

Key Specifications

Pinout & Package

TSSOP-14 surface-mount package (4.9 mm × 4.4 mm × 1.1 mm height), lead-free and RoHS-compliant, optimized for automated assembly and thermal dissipation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT125PW and 74VHC125M, the 74HCT125T14-13 delivers guaranteed 125°C operation, integrated Schmitt triggers, and tighter Z-state leakage-making it optimal for automotive body control modules and industrial HMIs where reliability under thermal stress and EMI is mandatory.

Availability

74HCT125T14-13 is available at Aetrix Electronics and suitable for PC motherboard design, industrial PLC I/O expansion, and optical drive control requiring stable component supply and long-term lifecycle support.

Supply support for 74HCT125T14-13 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 components for industrial, computing, and consumer markets.

The 74HCT logic family targets robust, drop-in replacements for legacy TTL systems-emphasizing noise immunity, wide temperature operation, and compatibility with mixed-voltage board designs.

FAQ

What is the maximum operating temperature for the 74HCT125T14-13?

The device is fully specified from –40°C to +125°C ambient temperature, with all electrical parameters-including propagation delay, output drive, and Z-state leakage-guaranteed across this range. Junction temperature must not exceed +150°C under steady-state conditions, requiring appropriate PCB copper pour and airflow in high-density applications.

Can unused enable inputs be left floating?

No. Unused enable inputs must be tied to V_CC (to disable the corresponding buffer) or GND (to enable it), per Diodes' Recommended Operating Conditions. Floating enables risk indeterminate output states, increased ICC, and potential bus contention due to noise-induced toggling on Schmitt-triggered inputs.

Does the 74HCT125T14-13 support hot-swap insertion?

While not formally qualified for hot-swap, its 2 kV HBM ESD rating, rail-to-rail input tolerance (–0.5V to V_CC +0.5V), and controlled Z-state transition times (t_EN/t_DIS ≤ 42 ns) make it suitable for controlled hot-plug scenarios when used with series current-limiting resistors and proper power-rail sequencing.

How does the Schmitt-trigger input improve system reliability?

The Schmitt-trigger action provides hysteresis (~0.3V typical) on all inputs, rejecting noise spikes and slow edge rates that could cause metastability or double-clocking in enable or data lines-especially critical in industrial environments with relay switching, motor commutation, or long cable runs.