Texas Instruments 74AHCT1G125DCKTE4

Overview

74AHCT1G125DCKTE4 from Texas Instruments is a single 3-state bus buffer gate with TTL-compatible inputs, operating at 4.5–5.5 V, delivering ≤6 ns propagation delay at 5 V, ±8 mA output drive, and ≤10 µA quiescent supply current. It serves as a level-translating line driver in compact 5-pin SC-70 packages for space-constrained digital interface applications.

For engineers reviewing the 74AHCT1G125DCKTE4 datasheet, 74AHCT1G125DCKTE4 pinout, 74AHCT1G125DCKTE4 application, or 74AHCT1G125DCKTE4 equivalent, key selection criteria include its 3-state control timing (tPZH/tPHZ ≤ 8.5 ns), low-power CMOS operation, SC-70 thermal resistance (RθJA = 289.2 °C/W), and compatibility with 3.3 V-to-5 V up-translation in industrial logic interfaces.

Technical Context

The 74AHCT1G125DCKTE4 implements a noninverting buffer with active-low 3-state enable (OE), where Y follows A when OE is low and enters high-impedance when OE is high. Its TTL-voltage-compatible inputs accept 0.8 V VIL and 2.0 V VIH thresholds, enabling direct interfacing with legacy 3.3 V logic while driving 5 V buses.

Designed for noise-sensitive environments, it features slow edge rates (Δt/Δv = 20 ns/V) to suppress output ringing and overshoot. The device supports full industrial temperature range (–40°C to +125°C) and meets JESD 17 latch-up immunity (>250 mA).

Key Specifications

Pinout & Package

74AHCT1G125DCKTE4 uses the SC-70 (DCK) 5-pin surface-mount package, measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), with 0.65 mm lead pitch and maximum height of 1.1 mm - optimized for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Compared with SN74LVC1G125DCKR and 74AHC1G125SE-7, the 74AHCT1G125DCKTE4 uniquely delivers guaranteed TTL-input compatibility at 5 V while maintaining identical SC-70 footprint and 3-state timing - making it irreplaceable in legacy 5 V bus architectures requiring backward logic-level support.

Availability

74AHCT1G125DCKTE4 is available at Aetrix Electronics and suitable for industrial PLCs, server baseboard management, wireless infrastructure timing interfaces, and automated test equipment requiring stable component supply and long-term production continuity.

Supply support for 74AHCT1G125DCKTE4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications electronics.

The SN74AHCT family targets 5 V logic interface applications requiring TTL compatibility, low power, and robust 3-state control - designed specifically for industrial control, telecom infrastructure, and legacy system upgrades.

FAQ

What is the recommended power supply bypassing for 74AHCT1G125DCKTE4?

Place a 0.1 µF ceramic capacitor between VCC and GND, located within 2 mm of the 74AHCT1G125DCKTE4's pins. This minimizes high-frequency supply noise and ensures stable switching behavior. For systems with multiple 74AHCT1G125DCKTE4 devices, use individual capacitors per device rather than shared bulk capacitance.

Does 74AHCT1G125DCKTE4 support 3.3 V input logic levels?

Yes - the 74AHCT1G125DCKTE4 has TTL-compatible inputs with VIL = 0.8 V and VIH = 2.0 V, allowing reliable recognition of 3.3 V logic HIGH/LOW signals when powered at 5 V. This enables seamless 3.3 V-to-5 V up-translation without external level shifters.

What happens to the output of 74AHCT1G125DCKTE4 during power-up?

During power-up, the 74AHCT1G125DCKTE4 output Y enters an undefined state until VCC stabilizes and OE is asserted. To ensure high-impedance at power-up, tie OE to VCC via a pull-up resistor (e.g., 10 kΩ); this prevents bus contention before firmware initializes the enable signal.

Can 74AHCT1G125DCKTE4 drive a 50 pF load within timing specifications?

Yes - the 74AHCT1G125DCKTE4 guarantees tPLH/tPHL ≤ 9.5 ns and tPZH/tPHZ ≤ 11 ns at CL = 50 pF and VCC = 5 V, meeting timing requirements for moderate-speed digital interfaces such as SMBus, GPIO expansion, and control bus routing.

Is 74AHCT1G125DCKTE4 pin-compatible with other SC-70 5-pin buffers?

Yes - the 74AHCT1G125DCKTE4 uses the standard SC-70 (DCK) 5-pin footprint (2.0 mm × 2.1 mm, 0.65 mm pitch), matching SN74LVC1G125DCKR, SN74AHC1G125DCKR, and other industry-standard SC-70 logic buffers, enabling drop-in replacement where electrical specs align.