Texas Instruments 74LVC1G126DRLRG4

Overview

74LVC1G126DRLRG4 from Texas Instruments is a single 3-state bus buffer gate used for signal isolation and controlled data routing in low-voltage digital systems. It features true (non-inverting) logic, 3.3V/5V-compatible operation, ±24mA output drive at 3.3V, 3.7ns max propagation delay, and Ioff support for live insertion. It is commonly deployed in high-speed data acquisition paths and video infrastructure timing control.

For engineers reviewing the 74LVC1G126DRLRG4 datasheet, 74LVC1G126DRLRG4 pinout, 74LVC1G126DRLRG4 application, or 74LVC1G126DRLRG4 equivalent, key selection criteria include its SOT-5X3 (DRL) package footprint, 1.65V–5.5V supply range, over-voltage tolerant inputs up to 5.5V, and guaranteed 3-state leakage ≤10μA at 125°C.

Technical Context

The 74LVC1G126DRLRG4 implements a non-inverting buffer with active-high output enable (OE), where Y = A when OE = HIGH and Y = high-impedance when OE = LOW. Its CMOS input structure supports voltage translation down to VCC while accepting up to 5.5V on A/OE pins regardless of VCC level.

It uses balanced push-pull CMOS outputs capable of sourcing/sinking ±24mA at 3.3V, with Ioff circuitry ensuring <10μA off-state current when VCC = 0V. Thermal resistance is 364.1°C/W (RθJA) in its DRL package, and it meets JESD78 Class II latch-up immunity (>100mA).

Key Specifications

Pinout & Package

SOT-5X3 (DRL) package: 5-pin, 1.6mm × 1.2mm body, 2.1mm × 1.3mm overall footprint, ultra-compact for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Compared with SN74LVC1G125DRLRG4, the 74LVC1G126DRLRG4 provides true logic for direct signal pass-through, while compared with 74LVC1G126DBVR, it delivers superior thermal performance and 40% smaller area in the same functional role - critical for compact SSD and video module layouts.

Availability

74LVC1G126DRLRG4 is available at Aetrix Electronics and suitable for industrial motor controls, video broadcasting infrastructure, military radar subsystems, and enterprise SSD internal data routing requiring stable component supply and long-term lifecycle assurance.

Supply support for 74LVC1G126DRLRG4 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 SN74LVC1G126 product line delivers ultra-small, low-power, voltage-tolerant logic buffers optimized for signal integrity and mixed-voltage system integration in space- and power-constrained applications.

FAQ

What is the maximum operating temperature for the 74LVC1G126DRLRG4?

The 74LVC1G126DRLRG4 is rated for continuous operation from –40°C to +125°C ambient temperature. This extended range is validated per JEDEC JESD22-A108 and supports deployment in under-hood automotive modules, industrial motor drives, and military radar subsystems where thermal stress is significant. The 74LVC1G126DRLRG4 maintains full electrical specifications across this range, including 3.7ns max tpd at 125°C with 3.3V supply.

Does the 74LVC1G126DRLRG4 support 5V-tolerant inputs when powered from 1.8V?

Yes, the 74LVC1G126DRLRG4 accepts input voltages up to 5.5V on both A and OE pins regardless of VCC level - including when VCC = 1.8V. This over-voltage tolerance is implemented via internal protection circuitry without positive clamp diodes, enabling direct interface with 5V controllers or sensors without external level-shifting components. The 74LVC1G126DRLRG4 maintains full logic functionality and timing specs under these conditions.

Can the 74LVC1G126DRLRG4 be used in hot-swap applications?

Yes, the 74LVC1G126DRLRG4 includes Ioff circuitry that limits off-state current to ±10μA maximum when VCC = 0V, making it suitable for live-insertion scenarios. This feature prevents back-driving of powered backplanes or subsystems during card replacement. The 74LVC1G126DRLRG4 also meets JESD78 Class II latch-up immunity (>100mA), further enhancing reliability in hot-swap infrastructure such as modular video processing racks.

What is the recommended bypass capacitor for the 74LVC1G126DRLRG4?

A 0.1μF ceramic capacitor is recommended directly between VCC and GND pins of the 74LVC1G126DRLRG4, placed as close as possible to the device with minimal trace length. For improved noise rejection across frequency bands, TI recommends paralleling with a 1μF capacitor. This decoupling strategy ensures stable supply voltage during fast output transitions and prevents coupling of switching noise into adjacent analog or RF sections. The 74LVC1G126DRLRG4's low ICC (10μA max) makes it especially sensitive to supply ripple, so proper bypassing is essential.

Is the 74LVC1G126DRLRG4 pin-compatible with other members of the SN74LVC1Gxx family?

The 74LVC1G126DRLRG4 shares the same SOT-5X3 (DRL) pinout with SN74LVC1G125DRLRG4 (inverting buffer) and SN74LVC1G07DRLRG4 (open-drain buffer), enabling drop-in functional substitution where logic behavior permits. However, it is not pin-compatible with DBV, DCK, or DRY variants due to differing pin assignments - for example, OE is on pin 1 in DRL but pin 3 in DRY. Always verify pin mapping using the official TI package drawings before board reuse. The 74LVC1G126DRLRG4's pinout is fixed and documented in the SCES224S datasheet Figure 4.