Diodes Incorporated 74LVC1G125FX4-7

Overview

74LVC1G125FX4-7 from Diodes Incorporated is a single non-inverting 3-state buffer IC designed for voltage-level shifting and signal isolation in mixed-voltage digital systems. It operates from 1.65V to 5.5V, tolerates 5.5V inputs, delivers ±24mA output drive at 3.3V, and features IOFF circuitry for partial power-down protection-used in notebook I/O expansion, USB peripheral interface logic, and embedded controller bus buffering.

For engineers reviewing the 74LVC1G125FX4-7 datasheet, 74LVC1G125FX4-7 pinout, 74LVC1G125FX4-7 application, or 74LVC1G125FX4-7 equivalent, key selection criteria include its 1.65–5.5V supply range, 5.5V-tolerant inputs, IOFF-enabled power-down safety, and X2-DFN1409-6 chip-scale package footprint for space-constrained portable designs.

Technical Context

This device implements a single-channel CMOS buffer with active-low 3-state output enable (OE), enabling bidirectional bus control and signal gating in low-power digital subsystems. Its IOFF functionality disables both output and input paths during power-down, preventing back-current flow when VCC = 0V while inputs remain biased at up to 5.5V.

The logic is fully specified across –40°C to +125°C ambient, supports TTL-level interfacing, and exhibits propagation delays as low as 0.5ns (typ) at 3.3V. Input transition rate limits (5–20 ns/V) and ESD robustness (2kV HBM, 1kV CDM) ensure reliable operation in noisy industrial and consumer environments.

Key Specifications

Pinout & Package

X2-DFN1409-6 is a 0.4mm-thick, 1.4mm × 0.9mm chip-scale package with six solder pads and no leads; requires controlled thermal pad layout per Diodes Inc. recommended footprint (C = 1.000mm, G = 0.200mm, X = 0.400mm, Y = 0.150mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125DBVR and 74LVC1G125FS3-7, the 74LVC1G125FX4-7 offers superior thermal resistance (θJA = 470°C/W vs. ~200°C/W for SOT-23) and dedicated GND/NC pads for improved signal integrity-making it optimal for thermally constrained, high-reliability portable designs.

Availability

74LVC1G125FX4-7 is available at Aetrix Electronics and suitable for USB peripheral interface, embedded controller bus isolation, and industrial sensor signal conditioning requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74LVC1G125FX4-7 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, low-power solutions for industrial, computing, and consumer markets.

The 74LVC logic family targets space- and power-constrained digital interface applications, emphasizing voltage flexibility, robust ESD performance, and compact packaging for next-generation portable and embedded systems.

FAQ

What is the maximum allowable input voltage when VCC = 0V?

The 74LVC1G125FX4-7 supports 5.5V-tolerant inputs regardless of VCC state. When VCC = 0V, the IOFF circuitry actively disables input and output paths, limiting leakage to ±200μA max. This allows safe "live" signal injection into unpowered systems-common in hot-swap PCIe add-in cards and modular power supplies.

Can the NC pin (Pin 5) be grounded or left floating?

Pin 5 is internally unconnected and must remain unsoldered and unconnected per Diodes Inc. design guidelines. Grounding or routing it risks mechanical stress-induced solder joint fracture due to CTE mismatch, and floating poses no electrical risk. The pad serves only as mechanical anchor and thermal relief-not a functional node.

How does the IOFF feature differ from standard high-impedance output disable?

Standard 3-state disable only isolates the output driver; IOFF additionally disconnects input circuitry from VCC/GND, eliminating leakage paths through input clamps. This prevents back-current flow when downstream circuits remain powered-essential for battery-backed real-time clocks or always-on wake-up logic in portable devices.

Is the X2-DFN1409-6 package RoHS and halogen-free compliant?

Yes. The 74LVC1G125FX4-7 meets EU RoHS Directive 2011/65/EU and is halogen- and antimony-free ("Green"), containing <900ppm bromine, <900ppm chlorine (<1500ppm total Br+Cl), and <1000ppm antimony compounds-verified per Diodes Inc. material declarations and certified test reports.