Diodes Incorporated 74LVC2G125HD4-7

Overview

74LVC2G125HD4-7 from Diodes Incorporated is a dual 3-state buffer gate in an X2-DFN2010-8 package, operating from 1.65V to 5.5V supply. It provides two independent non-inverting buffers with separate output-enable controls (1OE, 2OE), ±24mA drive at 3.3V, and IOFF-enabled partial power-down protection. Used for voltage-level shifting between mixed-supply domains in portable computing peripherals.

For engineers reviewing the 74LVC2G125HD4-7 datasheet, 74LVC2G125HD4-7 pinout, 74LVC2G125HD4-7 application, or 74LVC2G125HD4-7 equivalent, key selection criteria include 3-state isolation timing (tpd ≤ 4.4ns @ 3.3V), IOFF leakage (<±10μA), Schmitt-trigger input hysteresis (~100mV), and DFN thermal resistance (θJA = 313°C/W).

Technical Context

This device implements two independent CMOS buffer channels, each with active-low 3-state enable logic and rail-to-rail input tolerance up to 5.5V. All inputs feature Schmitt-trigger action-critical for noise immunity with slow-rising signals in battery-powered interfaces.

The IOFF circuit actively disables outputs during VCC ramp-down or zero-bias conditions, blocking reverse current flow from powered downstream logic into the unpowered IC. This enables safe hot-insertion and multi-rail power sequencing in compact embedded systems.

Key Specifications

Pinout & Package

X2-DFN2010-8 package: 1.95mm × 1.0mm × 0.4mm body, 0.5mm lead pitch, exposed thermal pad (pin 4 = GND), no leads - requires solder paste stencil optimization and reflow profile validation for void-free thermal pad attachment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G125DPWR and 74LVC2G126GW,125, the 74LVC2G125HD4-7 offers the smallest footprint (1.95mm × 1.0mm) and lowest thermal resistance among DFN variants, making it optimal for thermally dense portable designs where board area and junction temperature are primary constraints.

Availability

74LVC2G125HD4-7 is available at Aetrix Electronics and suitable for USB peripheral control, industrial sensor interface isolation, and embedded display serial interface applications requiring stable component supply and guaranteed long-term manufacturability.

Supply support for 74LVC2G125HD4-7 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 consumer, industrial, and automotive markets.

The 74LVC logic family targets low-voltage, mixed-supply digital interfacing - designed specifically for voltage translation, bus isolation, and power-aware signal routing in space- and energy-constrained systems.

FAQ

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

The 74LVC2G125HD4-7 permits input voltages up to 5.5V regardless of VCC state, thanks to its IOFF protection architecture. When VCC = 0V, inputs remain tolerant to 5.5V, and outputs enter high-impedance mode with leakage limited to ±10μA at 125°C - enabling safe hot-plug operation into live buses.

Can this device translate 5V signals to a 1.8V domain?

Yes - the inputs accept 0–5.5V, and outputs swing rail-to-rail (0V to VCC). With VCC = 1.8V, the device accepts 5V inputs and produces 1.8V-compatible outputs. However, output drive strength drops to ±4mA at 1.65V, so ensure load capacitance and fanout remain within 15pF and one LVC gate respectively.

Is the thermal pad electrically connected internally?

Yes - the exposed thermal pad (pin 4) is internally tied to GND. It must be soldered to a dedicated PCB ground plane with ≥4 thermal vias (0.3mm diameter, spaced ≤1mm apart) to achieve the specified θJA = 313°C/W and prevent junction temperature exceedance above 125°C under full drive conditions.

Does the Schmitt-trigger behavior apply to both inputs of each buffer?

Yes - all four inputs (1A, 1OE, 2A, 2OE) feature identical Schmitt-trigger action with ~100mV hysteresis at VCC = 3.0V. This applies uniformly across the full 1.65–5.5V supply range and ensures noise immunity on both data and enable lines, critical for reliable operation in electrically noisy environments like motor-driven industrial equipment.