Texas Instruments 74AHC1G125DBVTE4

Overview

74AHC1G125DBVTE4 from Texas Instruments is a single 3-state bus buffer gate in SOT-23-5 package, operating from 2 V to 5.5 V with 6 ns max propagation delay at 5 V, ±8 mA output drive, and 10 µA max supply current. It serves as a level-translating line driver in digital interface isolation paths for industrial control and embedded systems.

For engineers reviewing the 74AHC1G125DBVTE4 datasheet, 74AHC1G125DBVTE4 pinout, 74AHC1G125DBVTE4 application, or 74AHC1G125DBVTE4 equivalent, key selection criteria include its 3-state enable control timing, voltage-level translation capability (inputs accept up to 5.5 V at any VCC), low-power CMOS operation, and thermal performance in compact SOT-23 packaging.

Technical Context

The 74AHC1G125DBVTE4 implements a noninverting buffer with active-low 3-state output enable (OE). When OE is low, A is passed to Y; when OE is high, Y enters high-impedance state. Its design supports bidirectional bus isolation and signal conditioning in mixed-voltage systems.

It features balanced CMOS output drive, input overvoltage tolerance up to 5.5 V regardless of VCC, and guaranteed operation across –40°C to +125°C. The device avoids bus contention via strict functional mode control per its truth table and requires no external pull-up on OE for power-up safety if tied to VCC.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.8 mm × 2.8 mm footprint, 2.9 mm × 1.6 mm body, 0.6 mm max height, JEDEC MO-178 compliant. RoHS-compliant, NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125DBVR and 74AUP1G125DBVRE4, the 74AHC1G125DBVTE4 uniquely supports full 2–5.5 V operation with balanced speed-power trade-off, making it the preferred choice for mixed-voltage industrial and consumer mainboards where 5 V legacy compatibility and 6 ns latency are jointly required.

Availability

74AHC1G125DBVTE4 is available at Aetrix Electronics and suitable for industrial motor controls, patient monitoring systems, electronic point-of-sale terminals, and TV/projector mainboards requiring stable component supply and long-term production continuity.

Supply support for 74AHC1G125DBVTE4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog, power management, and logic ICs.

The SN74AHC1G125 belongs to TI's advanced high-speed CMOS (AHC) logic family, designed for robust, low-power, mixed-voltage digital interfacing in industrial, medical, and consumer electronics.

FAQ

What is the maximum propagation delay of the 74AHC1G125DBVTE4 at 5 V?

The 74AHC1G125DBVTE4 has a maximum propagation delay (tPD) of 6 ns at VCC = 5 V ± 0.5 V and CL = 15 pF, measured across the A-to-Y path at 25°C. This value increases to 7 ns over the full –40°C to +125°C operating temperature range, ensuring predictable timing in thermally demanding applications like motor drives and medical equipment.

Can the 74AHC1G125DBVTE4 interface a 1.8 V microcontroller with a 5 V peripheral?

Yes - the 74AHC1G125DBVTE4 accepts input voltages up to 5.5 V regardless of VCC, enabling safe down-translation. When powered at 3.3 V or 5 V, it reliably buffers signals from 1.8 V logic (VIH min = 1.5 V at VCC = 2 V) to 5 V peripherals without external level shifters, preserving signal integrity in mixed-rail systems.

What is the recommended power supply decoupling for the 74AHC1G125DBVTE4?

Texas Instruments recommends a 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC pin of the 74AHC1G125DBVTE4. This minimizes supply noise and transient coupling during output switching. For systems with multiple logic devices, paralleling a 1 µF capacitor improves low-frequency filtering, but the 0.1 µF cap remains mandatory per TI layout guidelines.

Does the 74AHC1G125DBVTE4 require external pull-up resistors on the OE pin?

Yes - to ensure the output remains in high-impedance state during power-up or brown-out, OE should be tied to VCC through a pull-up resistor. TI specifies no minimum resistance value, but typical values range from 4.7 kΩ to 10 kΩ. This prevents unintended bus contention before firmware initializes the enable signal.

Is the 74AHC1G125DBVTE4 suitable for automotive applications?

The 74AHC1G125DBVTE4 is rated for –40°C to +125°C operation and is RoHS-compliant, but it is not AEC-Q100 qualified. For automotive applications, TI offers the pin-compatible SN74AHC1G125-Q1 variant, which undergoes full automotive qualification. Use the 74AHC1G125DBVTE4 only in non-safety-critical automotive subsystems where Q100 certification is not mandated.