Texas Instruments 74LVC1G126DBVRE4

Overview

74LVC1G126DBVRE4 from Texas Instruments is a single non-inverting bus buffer gate with 3-state output, designed for level translation 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 3.7 ns max propagation delay (tpd) at 3.3 V - used in high-speed data acquisition, video infrastructure, and motor control timing paths.

For engineers reviewing the 74LVC1G126DBVRE4 datasheet, 74LVC1G126DBVRE4 pinout, 74LVC1G126DBVRE4 application, or 74LVC1G126DBVRE4 equivalent, key selection criteria include 3-state enable timing (ten/tdis ≤ 5.5 ns), Ioff support for live insertion, overvoltage-tolerant inputs up to 5.5 V, and SOT-23-5 NanoFree™ packaging for space-constrained PCB layouts.

Technical Context

The 74LVC1G126DBVRE4 implements a CMOS-based non-inverting buffer with active-high output-enable (OE) control. Its 3-state output architecture enables dynamic bus sharing by placing Y in high-impedance when OE = low, while maintaining rail-to-rail logic compatibility across 1.65–5.5 V supply ranges.

It features balanced CMOS output drivers capable of sourcing/sinking equal current (±24 mA at 3.3 V), Ioff protection that disables all outputs at 0 V VCC, and input clamping diodes rated for ±2000 V HBM ESD. The device does not invert signal polarity and has no internal latch or memory function.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm footprint, 1.6 mm body width, 1.3 mm height, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125DBVR and 74LVC1G175DBVR, the 74LVC1G126DBVRE4 provides deterministic zero-latency signal pass-through essential for real-time bus arbitration and analog-digital interface synchronization - neither alternative replicates its combination of true logic, 3-state control, and overvoltage tolerance in SOT-23-5.

Availability

74LVC1G126DBVRE4 is available at Aetrix Electronics and suitable for high-speed data acquisition, video broadcasting infrastructure, and military radar signal processing requiring stable component supply across extended temperature and long production lifecycles.

Supply support for 74LVC1G126DBVRE4 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 with over 50 years of innovation in high-reliability interface ICs.

The SN74LVC1G126DBVRE4 belongs to TI's LVC logic family - engineered for low-voltage operation, mixed-signal interoperability, and robust performance in industrial, automotive, and communications infrastructure.

FAQ

What is the maximum input voltage the 74LVC1G126DBVRE4 can tolerate?

The 74LVC1G126DBVRE4 accepts input voltages up to 5.5 V regardless of VCC level - a feature known as overvoltage-tolerant inputs. This allows direct interfacing with 5 V systems while operating at lower supply voltages like 1.8 V or 2.5 V, eliminating the need for external level translators in many mixed-voltage designs. Absolute maximum rating is strictly limited to 5.5 V; exceeding it risks permanent damage.

Does the 74LVC1G126DBVRE4 support partial power-down operation?

Yes, the 74LVC1G126DBVRE4 includes Ioff circuitry that disables all outputs when VCC = 0 V, limiting leakage current to ±10 μA. This enables safe live insertion and hot-swap capability in modular systems, prevents back-driving of powered-down sections, and supports staggered power sequencing in complex PCBs - critical for telecom and industrial backplane applications.

What is the typical propagation delay of the 74LVC1G126DBVRE4 at 3.3 V?

The 74LVC1G126DBVRE4 has a maximum propagation delay (tpd) of 3.7 ns at VCC = 3.3 V, CL = 15 pF, and TA = 25°C. Typical values are lower - approximately 0.6 ns under same conditions - making it suitable for high-speed digital interfaces such as FPGA I/O expansion, ADC/DAC data latching, and real-time control loops where sub-nanosecond timing margins matter.

Can the 74LVC1G126DBVRE4 drive a 50 Ω transmission line directly?

Yes - the 74LVC1G126DBVRE4 delivers ±24 mA output drive at 3.3 V, sufficient to drive a 50 Ω load with ~1.6 V swing (VOL ≈ 0.55 V, VOH ≈ 2.75 V). For clean signal integrity, TI recommends adding a small series resistor (e.g., 10–22 Ω) near the output to dampen reflections, especially for traces longer than 12 cm or when driving unterminated lines.

Is the 74LVC1G126DBVRE4 pin-compatible with other SOT-23-5 logic buffers?

The 74LVC1G126DBVRE4 uses the standard DBV (SOT-23-5) pinout: Pin 1 = OE, Pin 2 = A, Pin 3 = GND, Pin 4 = Y, Pin 5 = VCC. It is pin-compatible with SN74LVC1G125DBVR (inverting variant) and SN74LVC1G07DBVR (open-drain buffer), but not with devices having different pin assignments (e.g., DCK or DRY packages). Always verify mechanical fit and thermal derating for your specific layout.