Texas Instruments SN74LVC2G126DCUR

Overview

SN74LVC2G126DCUR from Texas Instruments is a dual 3-state bus buffer gate designed for level-shifting and bidirectional bus isolation in low-voltage digital systems. It operates from 1.65 V to 5.5 V, supports 5.5-V-tolerant inputs, delivers ±24 mA output drive at 3.3 V, and achieves 4 ns max propagation delay at 3.3 V - enabling use in high-speed data acquisition, SSD interconnects, and video infrastructure timing paths.

For engineers reviewing the SN74LVC2G126DCUR datasheet, SN74LVC2G126DCUR pinout, SN74LVC2G126DCUR application, or SN74LVC2G126DCUR equivalent, key selection considerations include its Ioff-enabled live insertion capability, 3.3 V/5 V mixed-signal interface compatibility, 8-pin VSSOP package footprint, and verified 125°C operational rating for industrial and broadcast equipment designs.

Technical Context

The SN74LVC2G126DCUR implements two independent noninverting buffers, each with dedicated 3-state output-enable control (1OE, 2OE). Its CMOS design supports voltage translation from 5.5 V down to VCC (e.g., 5 V → 3.3 V or 1.8 V), enabled by input overvoltage tolerance and Ioff circuitry that blocks current flow when VCC = 0 V.

Functional behavior follows Y = A logic with high-impedance outputs asserted when OE is low. Propagation delay (tpd) is specified across –40°C to +125°C and multiple VCC rails (1.8 V to 5 V), with worst-case tpd of 5 ns at 3.3 V and 125°C - confirming suitability for sub-100 MHz digital signal routing where timing margin and power-down safety are critical.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.30 mm × 2.00 mm body, 0.5 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G125DCUR and 74LVC2T45DCUR, the SN74LVC2G126DCUR delivers deterministic noninverting buffering with the lowest tpd (4 ns) and simplest enable architecture - making it optimal for fixed-direction, high-speed digital isolation where polarity preservation and timing predictability are primary requirements.

Availability

SN74LVC2G126DCUR is available at Aetrix Electronics and suitable for high-speed data acquisition, video broadcasting infrastructure, industrial motor control, and SSD internal interconnect applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC2G126DCUR 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 leader specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74LVC2G126DCUR belongs to TI's LVC logic family - engineered for low-voltage operation (1.65–5.5 V), high noise immunity, and robust Ioff protection to serve mixed-signal interface needs in space-constrained, thermally demanding systems.

FAQ

What is the maximum operating temperature for the SN74LVC2G126DCUR?

The SN74LVC2G126DCUR is rated for continuous operation from –40°C to +125°C ambient temperature. This specification is validated per JEDEC JESD78 latch-up testing and thermal characterization in the VSSOP-8 package, making the SN74LVC2G126DCUR suitable for under-hood automotive modules, industrial PLCs, and broadcast equipment enclosures where thermal derating is critical.

Does the SN74LVC2G126DCUR support 5 V to 3.3 V level translation?

Yes, the SN74LVC2G126DCUR supports 5 V to 3.3 V level translation via its 5.5-V-tolerant inputs. When powered at VCC = 3.3 V, the device accepts 0–5.5 V input voltages on 1A and 2A pins while producing valid 3.3 V CMOS-compatible outputs on 1Y and 2Y. This capability is explicitly confirmed in Section 8.3 of the datasheet and does not require external components - a core function of the SN74LVC2G126DCUR.

What is the purpose of the Ioff feature in the SN74LVC2G126DCUR?

The Ioff feature in the SN74LVC2G126DCUR disables all input and output circuitry when VCC = 0 V, limiting leakage current to ±10 µA. This prevents damaging back-current flow during live insertion, partial power-down, or system sleep states - a requirement verified per JESD78 Class II latch-up testing. The Ioff behavior is intrinsic to the SN74LVC2G126DCUR's silicon design and requires no external circuitry.

Can the SN74LVC2G126DCUR drive LEDs directly?

Yes, the SN74LVC2G126DCUR can drive LEDs directly: each output delivers ±24 mA at 3.3 V, sufficient for standard indicator LEDs (2–20 mA typical). Section 9.1 of the datasheet explicitly cites "LED application" as a use case. For reliability, limit continuous current to ≤20 mA per output and ensure proper current-limiting resistors are used - a design practice confirmed for the SN74LVC2G126DCUR in typical application schematics.

Is the SN74LVC2G126DCUR pin-compatible with other VSSOP-8 logic devices?

The SN74LVC2G126DCUR uses the industry-standard VSSOP-8 (DCU) footprint with 0.5 mm pitch and 2.30 mm × 2.00 mm body size, matching TI's own SN74LVC2G125DCUR and 74LVC2T45DCUR. However, pin functions differ: SN74LVC2G126DCUR assigns 1OE/1A/1Y/2A/2OE/2Y/GND/VCC, whereas other families may assign different signals to those positions. Physical compatibility does not imply functional or electrical pin-to-pin equivalence for the SN74LVC2G126DCUR.