Diodes Incorporated 74LVC1G126FS3-7

Overview

74LVC1G126FS3-7 from Diodes Incorporated is a single non-inverting 3-state buffer IC designed for voltage-level shifting and bus isolation in mixed-voltage 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-enabling use in portable computing and peripheral interfaces.

For engineers reviewing the 74LVC1G126FS3-7 datasheet, 74LVC1G126FS3-7 pinout, 74LVC1G126FS3-7 application, or 74LVC1G126FS3-7 equivalent, key selection criteria include its 0.8mm × 0.8mm X2-DFN0808-4 package, 3.0ns typical propagation delay at 3.3V, 5.5V-tolerant inputs, IOFF-enabled power-down isolation, and ±24mA drive strength for driving high-capacitance buses.

Technical Context

This device implements a CMOS-based single-buffer architecture with active-high output enable (OE), enabling precise control of signal flow on shared data lines. Its IOFF functionality disables both output and input paths during power-down, preventing back-current flow when VCC = 0V.

The logic is fully specified across 1.65V–5.5V supply range, supports TTL-level input compatibility, and maintains defined VOL/VOH across temperature (−40°C to +125°C) and voltage extremes-critical for reliable inter-rail communication in battery-powered and hot-swap systems.

Key Specifications

Pinout & Package

X2-DFN0808-4 is a 0.8mm × 0.8mm, 4-terminal chip-scale package with diamond pad layout and 0.5mm pad pitch. It features no exposed thermal pad and requires solder paste stencil optimization per Diodes' recommended footprint (C = 0.48mm, X/Y = 0.32mm).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G126DBVR, the 74LVC1G126FS3-7 offers superior power-down safety via IOFF and 64% smaller footprint; versus 74LVC1G125FS3-7, it preserves signal polarity critical for timing-critical control paths without adding logic layers.

Availability

74LVC1G126FS3-7 is available at Aetrix Electronics and suitable for USB peripheral isolation, mobile device power sequencing, and industrial sensor bus interface requiring stable component supply across high-mix, low-volume production runs.

Supply support for 74LVC1G126FS3-7 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with emphasis on power management, signal integrity, and connectivity products for industrial, computing, and consumer markets.

The 74LVC logic family targets low-voltage, high-speed digital interfacing-designed specifically for voltage translation, bus buffering, and power-aware signal routing in space-constrained, energy-efficient electronics.

FAQ

Can 74LVC1G126FS3-7 operate with VCC = 1.5V?

No. The recommended minimum operating voltage is 1.65V per DS32203 Rev. 11–2. At 1.5V, VOH drops below 0.95V (min) and propagation delay exceeds 10.5ns, violating guaranteed timing and logic threshold specifications. Data retention is supported down to 1.5V, but functional operation requires ≥1.65V.

What is the maximum capacitive load this device can drive reliably?

At VCC = 3.3V and TA = 25°C, the device maintains ≤6.0ns tpd driving a 30pF load (per test condition in datasheet Figure 1). For loads >30pF, rise/fall times increase linearly; sustained operation beyond 50pF may violate setup/hold margins in synchronous interfaces unless compensated with series termination.

Is the NC pin on X2-DFN0808-4 internally connected?

No. The X2-DFN0808-4 package has only four terminals (GND, A, OE, Y); there is no NC pin. Pin assignment diagrams in DS32203 confirm GND–A–OE–Y in clockwise order from top-left corner (pin #1 marked by chamfer), with no fifth or sixth terminal present.

Does IOFF protect against reverse current when VCC = 0V and OE = HIGH?

Yes. IOFF activates whenever VCC = 0V, regardless of OE state. When powered down, both input and output MOSFETs are cut off, limiting leakage to ±200μA max-even with OE held HIGH and 5.5V applied to A or Y. This prevents back-driving of powered-down domains in multi-supply systems.