Diodes Incorporated 74AHC125T14-13

Overview

74AHC125T14-13 from Diodes Incorporated is a quadruple 3-state non-inverting 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 8mA output drive at 4.5V, features Schmitt-trigger inputs, and tolerates 5.5V inputs while powered at 3.3V - enabling use in PC peripheral interfaces and embedded control buses.

For engineers reviewing the 74AHC125T14-13 datasheet, 74AHC125T14-13 pinout, 74AHC125T14-13 application, or 74AHC125T14-13 equivalent, key selection criteria include its 3.0–5.5V propagation delay (3.0–7.5 ns), 5.5V-tolerant inputs, TSSOP-14 package footprint, and dual-voltage interface capability in industrial I/O expansion and legacy bus bridging.

Technical Context

This device implements four independent CMOS buffer gates, each with an active-low 3-state enable input controlling high-impedance output states. Its Schmitt-trigger inputs provide noise immunity on slow-rising signals, and input voltage tolerance up to 5.5V allows interfacing between 3.3V logic domains and 5V peripherals without external level shifters.

The 74AHC125T14-13 uses advanced AHC logic family design, delivering low static current (≤40 µA at 3.6V), low dynamic power dissipation (15 pF typical Cpd at 5V), and guaranteed operation across –40°C to +125°C ambient temperature - making it suitable for thermally constrained embedded control modules.

Key Specifications

Pinout & Package

TSSOP-14 package: 4.9 mm × 4.4 mm body, 0.65 mm pitch, exposed pad not present, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125APWR and 74HC125PW,118, the 74AHC125T14-13 uniquely balances 5.5V input tolerance, Schmitt-trigger noise rejection, and sub-5 ns propagation - making it optimal for robust mixed-voltage bus isolation where signal integrity and thermal reliability are critical.

Availability

74AHC125T14-13 is available at Aetrix Electronics and suitable for PC motherboard design, industrial PLC I/O modules, automotive infotainment interfaces, and embedded test equipment requiring stable component supply and long-term lifecycle support.

Supply support for 74AHC125T14-13 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 power management, signal integrity, and protection solutions for industrial, computing, and automotive markets.

The 74AHC logic family targets high-speed, low-power, mixed-voltage interface applications - specifically engineered for robust operation in thermally demanding embedded systems where voltage translation and bus contention control are essential.

FAQ

What is the maximum capacitive load this device can drive reliably?

The 74AHC125T14-13 is characterized up to 50 pF load capacitance in switching specifications, with propagation delay increasing from 3.0 ns (15 pF) to 7.5 ns (50 pF) at 5V. Driving >50 pF may cause excessive rise/fall times or output overshoot; for heavier loads, add series termination or use a buffer with higher drive strength.

Can unused inputs be left floating?

No. Per datasheet Note 5, all unused inputs must be tied to VCC or GND to prevent undefined logic states, increased ICC, and potential oscillation. Floating inputs on Schmitt-trigger devices can cause erratic enable behavior and elevated power consumption due to internal metastability.

Is the TSSOP-14 package RoHS and halogen-free?

Yes. The 74AHC125T14-13 is fully RoHS 2 compliant (2011/65/EU), lead-free, and halogen-free per Diodes Incorporated's "Green" definition: Br < 900 ppm, Cl < 900 ppm (total Br+Cl < 1500 ppm), and Sb < 1000 ppm - verified per JESD22-A112 test methods.

Does this part support hot-swap insertion on live backplanes?

No. While the device has robust ESD ratings (2 kV HBM), it lacks powered-off protection circuitry. Inserting or removing the 74AHC125T14-13 while VCC is applied risks latch-up or output contention if OE and A pins are driven before power stabilization - use hot-swap controllers or sequenced power supplies in such systems.