Diodes Incorporated 74AHCT1G125W5-7

Overview

74AHCT1G125W5-7 from Diodes Incorporated is a single non-inverting buffer gate with 3-state output, designed for bus driving and signal isolation in 5V TTL-compatible digital systems. It operates from 4.5V to 5.5V, delivers ±8 mA output drive at 5.0V, features Schmitt-trigger inputs for noise immunity, and enters high-impedance state when OE is HIGH - used in PC motherboard I/O expansion and peripheral control logic.

For engineers reviewing the 74AHCT1G125W5-7 datasheet, 74AHCT1G125W5-7 pinout, 74AHCT1G125W5-7 application, or 74AHCT1G125W5-7 equivalent, key selection criteria include 3-state enable timing (t_EN/t_DIS ≤ 7.0 ns), input hysteresis (ΔV_IN ≈ 0.3 V), rail-to-rail output swing, and SOT25 package thermal resistance (θ_JA = 204°C/W).

Technical Context

This device implements a CMOS-based AHCT logic family interface, combining TTL-level input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) with 5V supply operation and low static current (I_CC ≤ 40 μA). Its Schmitt-trigger inputs provide 0.3 V hysteresis, enabling robust operation with slow-rising signals from mechanical switches or legacy controllers.

The 3-state output control is active-low on OE: when OE = LOW, Y follows A; when OE = HIGH, Y enters high-impedance mode with leakage ≤ 10 μA at 5.5V. Propagation delay is specified at CL = 15 pF and CL = 50 pF, supporting both compact PCB layouts and longer trace routing without timing violation.

Key Specifications

Pinout & Package

SOT25 (5-pin small outline transistor) package: 1.3 mm × 2.8 mm footprint, 0.95 mm height, lead-free and RoHS-compliant, optimized for automated placement and reflow soldering on dense PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AHCT1G125DBVR and 74LVC1G125GW,125, the 74AHCT1G125W5-7 offers optimal balance of 5V TTL compatibility, Schmitt-trigger noise rejection, and minimal SOT25 footprint - making it preferred for space-constrained industrial and PC peripheral designs requiring deterministic 3-state behavior.

Availability

74AHCT1G125W5-7 is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial sensor interface modules, and legacy system glue logic requiring stable component supply and long-term manufacturability.

Supply support for 74AHCT1G125W5-7 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, cost-optimized components for industrial, computing, and consumer markets.

The 74AHCT logic family targets 5V TTL-compatible digital interfacing with enhanced noise immunity and low power - specifically engineered for robust signal conditioning in legacy and mixed-signal embedded systems.

FAQ

Can the 74AHCT1G125W5-7 operate reliably at 4.5 V supply?

Yes. The device is fully specified from 4.5 V to 5.5 V, with guaranteed output drive (±8 mA), propagation delay (≤7.0 ns), and input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) across this range. At 4.5 V, VOH remains ≥3.70 V and VOL ≤0.55 V under full load, ensuring noise margins >0.7 V in 5V systems.

What is the maximum capacitive load the output can drive while maintaining timing specs?

The datasheet specifies switching characteristics up to CL = 50 pF, with t_PD ≤ 9.5 ns and t_EN/t_DIS ≤ 11.0 ns at V_CC = 5.0 V. For loads exceeding 50 pF, propagation delay increases linearly (~0.03 ns/pF), and rise/fall times degrade; external series termination or buffer staging is recommended beyond this limit.

Is the SOT25 package compatible with standard SOT-23-5 reflow profiles?

Yes. The SOT25 footprint matches JEDEC MO-178AB, and its thermal profile (θ_JA = 204°C/W) is validated for standard lead-free reflow (peak 260°C, 60–90 sec above 217°C). Pad layout per Diodes AP02001 ensures coplanarity and solder joint reliability without tombstoning.

Does the Schmitt-trigger input affect logic-level compatibility with 3.3 V microcontrollers?

No. The Schmitt-trigger only adds hysteresis to the input threshold; VIH remains 2.0 V min and VIL stays 0.8 V max, fully compatible with 3.3 V CMOS outputs (VOH ≥ 2.4 V, VOL ≤ 0.4 V). Input hysteresis improves noise margin but does not shift DC logic thresholds outside TTL specifications.