Texas Instruments SN74LVC2G126DCTRE4

Overview

SN74LVC2G126DCTRE4 from Texas Instruments is a dual non-inverting 3-state buffer/line driver with Schmitt-trigger inputs, operating from 1.65 V to 5.5 V supply, supporting 5 V-tolerant I/O, ±24 mA output drive at 3.0 V, and IOFF partial power-down protection. It enables bidirectional voltage translation between 3.3 V and 5 V logic domains in compact embedded bus interfaces.

For engineers reviewing the SN74LVC2G126DCTRE4 datasheet, SN74LVC2G126DCTRE4 pinout, SN74LVC2G126DCTRE4 application, or SN74LVC2G126DCTRE4 equivalent, key selection criteria include 3-state control timing (enable/disable < 6 ns at 3.3 V), input hysteresis for slow-edge noise immunity, IOFF current blocking during power-down, and VSSOP8 package compatibility with high-density PCB layouts.

Technical Context

This device implements two independent non-inverting buffers, each with active-HIGH output enable (nOE) controlling high-impedance OFF-state. Schmitt-trigger inputs provide ≥0.3 V hysteresis across all supply voltages, enabling robust operation with slow-rising signals. The IOFF circuit actively disables outputs when VCC = 0 V, preventing backflow current up to 5.5 V on I/O pins.

It complies with JEDEC standards JESD8-7 (1.65–1.95 V), JESD8-5 (2.3–2.7 V), and JESD8-B/JESD36 (2.7–3.6 V), and supports full operation from −40 °C to +125 °C. Input voltage range extends to 5.5 V regardless of VCC, allowing direct interfacing with 5 V TTL and CMOS logic.

Key Specifications

Pinout & Package

VSSOP8 package: plastic very thin shrink small outline package, 8 leads, body width 2.3 mm, lead pitch 0.5 mm, pin 1 indicator at lower-left corner below marking code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G125DCTRE4, SN74LVC2G126DCTRE4 preserves signal polarity essential for clock and control lines; compared with 74LVC2G126DCUR, it offers easier assembly and thermal relief via gull-wing leads while retaining identical electrical behavior and temperature rating.

Availability

SN74LVC2G126DCTRE4 is available at Aetrix Electronics and suitable for industrial sensor interfaces, FPGA I/O expansion, automotive body control modules, and portable medical monitors requiring stable component supply across extended temperature ranges.

Supply support for SN74LVC2G126DCTRE4 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

Texas Instruments is a global semiconductor company delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

SN74LVC2G126DCTRE4 belongs to the LVC logic family designed for low-voltage, high-speed, 5 V-tolerant interfacing in space-constrained embedded systems with mixed-voltage domains.

FAQ

What is the maximum input voltage allowed on SN74LVC2G126DCTRE4 pins when VCC = 0 V?

The SN74LVC2G126DCTRE4 supports input voltages up to 5.5 V even when powered down (VCC = 0 V), thanks to its IOFF circuitry. This feature prevents damaging backflow current and enables safe hot-swap operation in modular systems where SN74LVC2G126DCTRE4 interfaces with live 5 V buses during power sequencing.

Does SN74LVC2G126DCTRE4 support true bidirectional data flow?

No, SN74LVC2G126DCTRE4 is a dual non-inverting unidirectional buffer with independent 3-state control per channel. Each channel (1A→1Y, 2A→2Y) flows in one direction only. Bidirectional operation requires external control logic or complementary devices like the SN74LVC2G66 for analog switching.

What is the typical propagation delay of SN74LVC2G126DCTRE4 at 3.3 V supply?

At VCC = 3.3 V and ambient temperature, the typical propagation delay (tpd) of SN74LVC2G126DCTRE4 is 2.4 ns, with a maximum of 5.4 ns over −40 °C to +125 °C. This ensures reliable timing closure in 100+ MHz digital interfaces when used for clock fanout or data path extension.

Can SN74LVC2G126DCTRE4 replace older 74LS or 74HC logic in existing designs?

Yes, SN74LVC2G126DCTRE4 can replace 74LS244 or 74HC244 in many cases due to its 5 V-tolerant inputs, compatible pinout (VSSOP8), and improved speed/power trade-off. However, verify that the active-HIGH OE polarity and Schmitt-trigger inputs align with legacy timing requirements before drop-in substitution.

Is SN74LVC2G126DCTRE4 RoHS compliant and halogen-free?

Yes, SN74LVC2G126DCTRE4 is RoHS compliant and halogen-free per Texas Instruments' official product documentation. The "E4" suffix denotes green packaging, confirming compliance with JEDEC JS709 and IPC-1752 standards for environmentally sensitive electronics manufacturing.