Texas Instruments SN74AHC1G125DBVR

Overview

SN74AHC1G125 from Texas Instruments is a single-channel CMOS bus buffer gate with 3-state output, designed for level-shifting and bus isolation in low-power digital systems. It operates from 2 V to 5.5 V, delivers ±8 mA output drive at 5 V, achieves 6 ns max propagation delay, and supports –40°C to +125°C industrial temperature range - used in projector video data routing, server board management interfaces, and motor control logic sequencing.

For engineers reviewing the SN74AHC1G125 datasheet, SN74AHC1G125 pinout, SN74AHC1G125 application, or SN74AHC1G125 equivalent, key selection criteria include its 3-state enable timing (tPZH/tPHZ), input voltage tolerance up to 5.5 V independent of VCC, low ICC (≤10 µA), and SOT-23-5 package compatibility with high-density PCB layouts.

Technical Context

The SN74AHC1G125 implements a noninverting buffer with active-low 3-state output enable (OE), where Y = A when OE = L and Y = high-impedance when OE = H. Its CMOS design ensures rail-to-rail input compatibility and symmetric output drive strength.

It supports down-translation: inputs accept 0–5.5 V regardless of VCC (2–5.5 V), enabling interfacing between 3.3 V logic and 5 V peripherals without external level shifters. Propagation delay varies with load capacitance (e.g., 3.8–7 ns at 5 V/15 pF) and supply voltage.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.8 mm × 2.8 mm footprint, 1.6 mm body width, 0.6 mm max height, gull-wing leads, RoHS-compliant matte tin (Sn) finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHC1G125, SN74LVC1G125 offers higher speed and drive but sacrifices 2 V operation and 5.5 V input tolerance, while 74AUP1G125 provides superior quiescent current at the cost of voltage range and temperature capability - making SN74AHC1G125 the balanced choice for industrial mixed-voltage designs.

Availability

SN74AHC1G125 is available at Aetrix Electronics and suitable for projector video routing, server baseboard management, and AC induction motor control applications requiring stable component supply, long-term lifecycle support, and industrial-grade temperature performance.

Supply support for SN74AHC1G125 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 markets.

The SN74AHC1G125 belongs to TI's AHC logic family, engineered for robustness in mixed-voltage digital systems where level translation, bus isolation, and low-power 3-state control are critical.

FAQ

What is the maximum output current rating for the SN74AHC1G125?

The SN74AHC1G125 supports ±25 mA continuous output current per pin and ±50 mA total device current. However, its specified output drive is ±8 mA at 5 V under switching conditions - this value ensures reliable timing and voltage margins across temperature and process variation. Exceeding ±8 mA may increase propagation delay or cause VOL/VOH degradation beyond datasheet limits.

Does the SN74AHC1G125 support 5 V-tolerant inputs when powered at 3.3 V?

Yes, the SN74AHC1G125 accepts input voltages up to 5.5 V regardless of VCC level - including when VCC = 3.3 V. This 5 V-tolerant input capability is explicitly guaranteed in Section 5.3 (Recommended Operating Conditions) and enables direct interfacing with legacy 5 V peripherals without external level shifters, a key advantage over standard LVC-family buffers.

How should the OE pin be handled during power-up to ensure safe operation of the SN74AHC1G125?

To guarantee high-impedance output at power-up, the OE pin of the SN74AHC1G125 must be held high via a pullup resistor to VCC. TI recommends sizing the resistor based on the driver's sink capability - typically 10 kΩ suffices for most microcontroller outputs. Leaving OE floating risks undefined output states and potential bus contention during startup sequences.

What is the thermal resistance (RθJA) of the SN74AHC1G125 in the DBV (SOT-23-5) package?

The SN74AHC1G125 in the DBV package has a junction-to-ambient thermal resistance (RθJA) of 278 °C/W under standard JEDEC test conditions (1-layer 1-in² copper pad). This value assumes minimal PCB copper; actual thermal performance improves significantly with added thermal vias and internal ground/power planes - critical for sustained operation near 125°C ambient.

Is there an automotive-qualified version of the SN74AHC1G125?

Yes, the SN74AHC1G125-Q1 is the AEC-Q100 qualified automotive variant of the SN74AHC1G125. It undergoes extended temperature testing (–40°C to +125°C), enhanced reliability screening, and is manufactured in IATF 16949-certified facilities - making it suitable for engine control units, ADAS domain controllers, and infotainment systems requiring zero-defect reliability.