Diodes Incorporated 74LVC2G38HD4-7

Overview

74LVC2G38HD4-7 from Diodes Incorporated is a dual 2-input NAND gate with open-drain outputs in an X2-DFN2010-8 package, operating from 1.65V to 5.5V supply, sinking up to 24mA at 3.3V, featuring IOFF partial-power-down protection and Schmitt-trigger inputs with ~100mV hysteresis at 3.0V - used for voltage-level shifting between mixed-voltage domains in portable computing interfaces.

For engineers reviewing the 74LVC2G38HD4-7 datasheet, 74LVC2G38HD4-7 pinout, 74LVC2G38HD4-7 application, or 74LVC2G38HD4-7 equivalent, key selection criteria include open-drain drive capability, wide VCC range compatibility, IOFF-enabled power-down isolation, and input tolerance up to 5.5V in level-shifting and bus-isolation designs.

Technical Context

This device implements two independent NAND logic functions (Y = A·B) with open-drain outputs requiring external pull-ups. Each gate supports bidirectional voltage translation due to 5.5V-tolerant inputs and rail-to-rail output swing capability under active drive.

The IOFF circuit disables both outputs when VCC = 0V, blocking back-current flow during partial power-down - critical for hot-swap and multi-rail system integrity. Schmitt-trigger inputs provide noise immunity with defined hysteresis (~100mV at 3.0V), enabling robust operation with slow-rising control signals.

Key Specifications

Pinout & Package

X2-DFN2010-8 package: 1.95mm × 1.0mm × 0.4mm body, 0.5mm lead pitch, exposed thermal pad (no internal connection), moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual open-drain NAND gate applications.

Compared with SN74LVC2G38DCKR and 74AUP2G38GM,115, the 74LVC2G38HD4-7 uniquely combines 5.5V input tolerance, Schmitt-trigger noise immunity, and thermally enhanced DFN packaging - making it optimal for compact, mixed-voltage interface isolation where reliability under partial power-down is mandatory.

Availability

74LVC2G38HD4-7 is available at Aetrix Electronics and suitable for USB peripheral design, I²C bus interfacing, power-domain isolation, and wearable device GPIO expansion requiring stable component supply and long-term production continuity.

Supply support for 74LVC2G38HD4-7 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, and small-footprint solutions for consumer, computing, and industrial markets.

The 74LVC logic family targets space-constrained, multi-voltage digital interfaces - designed specifically for level translation, bus isolation, and power-aware signal routing in portable and embedded systems.

FAQ

Can the 74LVC2G38HD4-7 drive an I²C bus directly?

Yes - its open-drain outputs support standard I²C bus topologies when paired with appropriate pull-up resistors (e.g., 2.2kΩ to 3.3V). The 24mA sink capability at 3.3V ensures robust low-state drive, and propagation delay <5.2ns meets 400kHz timing budgets. Inputs tolerate 5.5V, allowing direct connection to 5V slave devices.

What happens to the outputs when VCC = 0V?

IOFF circuitry actively disables both outputs, limiting leakage current to ±10μA maximum - preventing back-current from live inputs into the unpowered VCC rail. This protects upstream drivers and maintains signal integrity during hot-plug or power sequencing events in multi-rail systems.

Is a pull-up resistor required on the open-drain outputs?

Yes - open-drain outputs cannot source current; a pull-up resistor to the desired logic-high voltage (e.g., 1.8V, 3.3V, or 5V) is mandatory for proper NAND functionality. Resistor value depends on bus capacitance and speed: 1.8kΩ–10kΩ is typical for I²C, while 4.7kΩ balances rise time and power in GPIO applications.

Does the Schmitt-trigger input affect logic threshold voltages?

Yes - VIH and VIL thresholds are defined with hysteresis: at VCC = 3.0V, VIH ≈ 2.0V (rising) and VIL ≈ 1.9V (falling), giving ~100mV noise margin. This eliminates chatter on slow-rising signals like mechanical switch closures or RC-filtered reset lines without external components.