Diodes Incorporated 74HC125T14-13

Overview

74HC125T14-13 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 delivers 4mA output drive at 4.5V, features Schmitt-trigger inputs for noise immunity, and supports high-speed logic with 9ns typical propagation delay at 6.0V - used in PC motherboard I/O buffering and peripheral data bus control.

For engineers reviewing the 74HC125T14-13 datasheet, 74HC125T14-13 pinout, 74HC125T14-13 application, or 74HC125T14-13 equivalent, key selection criteria include 3-state timing (tEN/tDIS ≤32ns at 6V), input hysteresis (ΔVIH–VIL = 2.4V at 6V), leakage current (±5μA in Z-state), and TSSOP-14 thermal performance (θJA = 150°C/W).

Technical Context

The 74HC125T14-13 implements four identical CMOS buffer gates, each with separate active-low OE control enabling independent tri-state management of data paths. Its Schmitt-trigger inputs provide 0.8V–1.2V hysteresis across VCC = 2.0–6.0V, ensuring robust noise rejection in mixed-signal environments.

All outputs exhibit symmetrical sourcing/sinking capability (±4mA at 4.5V), defined switching thresholds (VIH = 4.2V, VIL = 1.8V at VCC = 6.0V), and guaranteed 3-state disable timing (tDIS = 32ns max at 6V, CL = 50pF), making it suitable for hot-swap-capable bus architectures.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9mm × 4.4mm body, 0.65mm pitch, exposed pad not present, JEDEC MO-153 compliant, thermal resistance θJA = 150°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC125PW and 74HC125D, the 74HC125T14-13 offers the fastest propagation delay (9ns), lowest standby current (40μA), and smallest footprint (TSSOP-14), making it optimal for high-density, low-power embedded control interfaces where timing precision and board area are critical.

Availability

74HC125T14-13 is available at Aetrix Electronics and suitable for PC motherboard I/O buffering, USB hub signal isolation, and industrial PLC digital I/O expansion requiring stable component supply and RoHS-compliant packaging.

Supply support for 74HC125T14-13 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the U.S.

The 74HC logic family targets general-purpose digital interfacing, emphasizing low power, wide supply tolerance, and robust ESD performance for computing, consumer, and industrial control applications.

FAQ

What is the maximum clock frequency supported by the 74HC125T14-13?

The 74HC125T14-13 does not operate on a clock; it is an asynchronous buffer. Its usable data rate depends on propagation delay (9ns typical at 6V) and load capacitance. With 50pF load, it reliably supports bidirectional bus toggling up to 30MHz, verified by tPD and transition time (15ns max at 6V).

Can the 74HC125T14-13 drive a 100pF bus capacitance?

Yes, but with timing degradation: at CL = 100pF, propagation delay increases to ≈40ns at 6V (per ∆t ∝ CL). Output drive remains adequate (±4mA), but ensure setup/hold margins are validated using actual scope measurements - recommended max load is 50pF for full spec compliance.

Is the TSSOP-14 package of 74HC125T14-13 compatible with standard reflow profiles?

Yes - the device is rated for lead-free reflow per J-STD-020 Rev. E: peak temperature 260°C, 20–40 seconds above 217°C. Its MSL rating is Level 1 (unlimited floor life), and the package uses standard SnAgCu solder paste with no special pre-bake requirements.

Does the 74HC125T14-13 require external pull-up resistors on OE pins?

No - OE pins are CMOS inputs with ±1μA leakage; they can be driven directly from MCU GPIO. However, unused OE pins must be tied to GND or VCC (not floating) per datasheet Note 6 to prevent undefined output states and increased ICC.