Texas Instruments 74LVC1G126DBVTG4

Overview

74LVC1G126DBVTG4 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 1.65V to 5.5V VCC, accepts inputs up to 5.5V, delivers ±24mA drive at 3.3V, achieves 3.7ns max propagation delay at 3.3V, and supports Ioff for live insertion in partial-power-down systems.

For engineers reviewing the 74LVC1G126DBVTG4 datasheet, 74LVC1G126DBVTG4 pinout, 74LVC1G126DBVTG4 application, or 74LVC1G126DBVTG4 equivalent, key selection criteria include its 3-state enable control timing (ten/tdis ≤5.5ns at 3.3V), overvoltage-tolerant inputs, NanoFree™ SOT-23-5 package footprint, and compatibility with mixed-voltage interface domains (e.g., 5V logic driving 3.3V buses).

Technical Context

The 74LVC1G126DBVTG4 implements a CMOS-based non-inverting buffer with active-high output-enable (OE) control. Its functional mode is defined by OE: when high, A passes directly to Y; when low, Y enters high-impedance state. The device uses standard CMOS inputs with input transition rate limits (≤10 ns/V at 3.3V) and balanced push-pull outputs capable of sourcing/sinking equal current.

It integrates Ioff circuitry that disables all outputs when VCC = 0V, preventing back-drive current and enabling hot-plug capability. Input clamping diodes are present only on the negative side, and inputs tolerate voltages up to 5.5V regardless of VCC - enabling down-translation from higher-voltage logic families into lower-VCC domains without external level shifters.

Key Specifications

Pinout & Package

74LVC1G126DBVTG4 is packaged in Texas Instruments' NanoFree™ DBV (SOT-23-5) package: 2.9mm × 2.8mm body with 0.95mm pitch, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125DBVT and 74LVC1G17GW,125, the 74LVC1G126DBVTG4 provides true (non-inverting) signal pass-through essential for timing-critical control paths, retains superior thermal performance in SOT-23-5, and offers guaranteed 5.5V input tolerance across full temperature range - making it the default choice for deterministic bus management.

Availability

74LVC1G126DBVTG4 is available at Aetrix Electronics and suitable for industrial motor controls, video broadcasting infrastructure, military radar signal conditioning, and power line communication modems requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for 74LVC1G126DBVTG4 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 decades of leadership in high-reliability interface IC design.

The SN74LVC1G126 product line targets low-voltage, high-speed digital interface applications - specifically engineered for mixed-supply domain bridging, bus isolation, and hot-pluggable subsystem interconnect in industrial, automotive, and communications equipment.

FAQ

What is the maximum input voltage the 74LVC1G126DBVTG4 can tolerate?

The 74LVC1G126DBVTG4 accepts input voltages up to 5.5V regardless of VCC level - a key feature enabling down-translation from 5V logic families into 3.3V or 1.8V domains. This specification is validated across the full operating temperature range (–40°C to +125°C) and does not require external clamping components. Exceeding 5.5V violates Absolute Maximum Ratings and risks permanent damage.

Does the 74LVC1G126DBVTG4 support hot-swap or live-insertion applications?

Yes, the 74LVC1G126DBVTG4 supports live insertion via its Ioff feature: when VCC = 0V, all I/O pins enter high-impedance state with leakage limited to ±10μA, preventing back-drive current into powered subsystems. This capability is explicitly characterized per JESD78 Class II latch-up standards and is critical for modular backplane architectures and field-replaceable units using the 74LVC1G126DBVTG4.

What is the recommended bypass capacitor for the 74LVC1G126DBVTG4?

A 0.1μF ceramic capacitor placed as close as possible to the VCC pin (Pin 5) and GND pin (Pin 3) is mandatory for stable operation of the 74LVC1G126DBVTG4. TI further recommends paralleling with a 1μF capacitor to suppress broadband noise. Layout guidelines specify short, wide traces and an unbroken ground plane beneath the device to minimize inductance and ensure effective decoupling at switching frequencies up to 270MHz.

Can the 74LVC1G126DBVTG4 drive a 50Ω transmission line directly?

The 74LVC1G126DBVTG4 can drive a 50Ω load when VCC = 3.3V and output current is limited to ±24mA, satisfying VOH ≥ 2.3V and VOL ≤ 0.55V per datasheet specs. However, TI recommends adding a series damping resistor (typically 22–33Ω) near the output to suppress ringing caused by fast edges into unterminated lines - especially for trace lengths >12cm. This practice preserves signal integrity without degrading timing margins of the 74LVC1G126DBVTG4.

Is the 74LVC1G126DBVTG4 pin-compatible with other SOT-23-5 logic buffers?

The 74LVC1G126DBVTG4 uses the standard DBV (SOT-23-5) pinout: Pin 1 = A, Pin 2 = Y, Pin 3 = GND, Pin 4 = OE, Pin 5 = VCC. This matches TI's SN74LVC1G125DBVT (inverting) and SN74LVC1G07DBVT (open-drain) variants, enabling drop-in substitution where logic function permits. However, pin compatibility does not guarantee functional equivalence - verify OE polarity, output type, and voltage tolerance before replacement in existing designs using the 74LVC1G126DBVTG4.