Diodes Incorporated 74LVC1G126SE-7

Overview

74LVC1G126SE-7 from Diodes Incorporated is a single non-inverting 3-state buffer IC designed for voltage-level shifting and bus isolation in mixed-voltage digital systems. It operates from 1.65V to 5.5V, features ±24mA output drive at 3.3V, 5.5V-tolerant inputs, and IOFF partial power-down protection-enabling safe operation during system sleep modes in portable computing and peripheral interfaces.

For engineers reviewing the 74LVC1G126SE-7 datasheet, 74LVC1G126SE-7 pinout, 74LVC1G126SE-7 application, or 74LVC1G126SE-7 equivalent, key selection criteria include its 3-state enable timing (tEN = 0.5–7.0 ns), low 0.65mm-pitch SOT353 package footprint, 5.5V input tolerance for 3.3V-to-5V interfacing, and guaranteed IOFF leakage <±200 µA at 0V supply.

Technical Context

This device implements a CMOS-based non-inverting buffer with active-high output enable (OE), where Y = A when OE = HIGH and Y = high-impedance when OE = LOW. Its IOFF circuit actively disables both output FETs during power-down, preventing back-current flow between powered and unpowered rails-a critical requirement for hot-swap and partial-power-down architectures.

Input thresholds scale with VCC (e.g., VIH = 0.7×VCC at 4.5–5.5V), ensuring reliable TTL- and LVTTL-compatible logic detection across supply voltages. Propagation delay ranges from 0.5 ns (5V) to 3.0 ns (1.8V), while output rise/fall times are controlled by load-dependent slew rate (5–20 ns/V).

Key Specifications

Pinout & Package

SOT353 (2.0mm × 2.0mm × 1.1mm, 0.65mm lead pitch) - ultra-compact 5-pin SC-70 package optimized for space-constrained mobile and wearable PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G126DBVR, the 74LVC1G126SE-7 offers superior partial-power-down safety via IOFF and lower quiescent current, while 74LVC1G125SE-7 provides functional parity with inverted logic-making the SE-7 variant the preferred choice for compact, robust, non-inverting signal conditioning in battery-powered and modular designs.

Availability

74LVC1G126SE-7 is available at Aetrix Electronics and suitable for USB peripheral isolation, mobile SoC signal routing, and industrial I/O module level shifting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for 74LVC1G126SE-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 logic solutions for consumer, computing, communications, and industrial markets, with design centers across Asia, Europe, and the US.

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- and energy-constrained embedded systems.

FAQ

Can 74LVC1G126SE-7 operate with VCC = 1.65V while accepting 5V inputs?

Yes. The device is fully specified for 1.65V–5.5V VCC operation and guarantees 5.5V-tolerant inputs across that entire range. At 1.65V supply, VIH is 0.65×VCC (≥1.07V), ensuring reliable recognition of 5V logic HIGH without damage or excessive leakage.

What is the maximum capacitive load this buffer can drive reliably at 3.3V?

Based on measured Cpd = 19pF and tpd = 2.0–4.5ns at 3.3V, the buffer maintains signal integrity up to 30pF total load (including trace and receiver capacitance). For >30pF, output rise/fall times degrade beyond 5ns, risking setup/hold violations in high-speed interfaces like MIPI or eMMC.

Does the SOT353 package support reflow soldering per IPC-J-STD-020?

Yes. The SOT353 package is rated for standard lead-free reflow profiles (peak 260°C, 20–40 sec above 217°C). Its 2.0mm × 2.0mm body and 0.65mm pitch meet IPC-7351B density Level A guidelines, and thermal resistance θJA = 371°C/W confirms compatibility with standard FR-4 PCBs using recommended pad layout.

How does IOFF behavior differ from standard high-impedance state?

IOFF actively disables both output FETs when VCC = 0V, limiting leakage to ±200µA even with 5.5V applied to Y or A pins. Standard high-Z only gates the output driver; it does not block current flow through parasitic substrate diodes-making IOFF essential for hot-plug and multi-rail power sequencing.