Texas Instruments SN74LVC126ANSR

Overview

SN74LVC126ANSR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for 1.65V–3.6V V_CC operation and rated for –40°C to +125°C. It features independent line drivers, 5.5V-tolerant inputs, 4.7ns max propagation delay at 3.3V, and supports mixed-voltage translation in SOP-14 systems such as SSD controller interfaces and audio dock data buses.

For engineers reviewing the SN74LVC126ANSR datasheet, SN74LVC126ANSR pinout, SN74LVC126ANSR application, or SN74LVC126ANSR equivalent, key selection criteria include 3-state output timing (t_pd, t_en, t_dis), input overvoltage tolerance, thermal performance in NS package, and compatibility with 3.3V/5V logic level translation in high-density consumer electronics layouts.

Technical Context

The SN74LVC126ANSR implements four independent non-inverting buffers, each controlled by a dedicated output-enable (OE) input. Its CMOS design enables balanced drive strength (±24 mA at 3V) and low dynamic power consumption (C_pd = 22 pF at 3.3V, 10 MHz).

Each buffer operates on positive logic (Y = A), with OE-active-low control ensuring high-impedance outputs when disabled. Input voltage tolerance up to 5.5V allows direct interfacing with legacy 5V logic while powered from 3.3V or lower supplies-critical for voltage translation in multi-rail embedded systems.

Key Specifications

Pinout & Package

SOP-14 (NS) package: 10.2 mm × 7.8 mm body size, 14-pin surface-mount plastic small-outline package with gull-wing leads; thermal pad not present; RoHS-compliant NiPdAu lead finish; MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC125ANSR and 74LVC126PW,118, the SN74LVC126ANSR provides optimal combination of active-low OE control, 24 mA drive, and 4.7ns speed-making it preferred for automotive-grade SSDs and HDMI hub designs requiring precise timing and robust voltage translation.

Availability

SN74LVC126ANSR is available at Aetrix Electronics and suitable for SSD controller interfaces, audio dock data buses, HDMI expansion hubs, and industrial tablet display interfaces requiring stable component supply across automotive and extended-temperature industrial programs.

Supply support for SN74LVC126ANSR 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 specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and high-reliability logic solutions.

The SN74LVC126ANSR belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-signal interface applications in consumer, industrial, and automotive electronics where voltage translation and bus isolation are critical.

FAQ

What is the maximum operating voltage for inputs on the SN74LVC126ANSR?

The SN74LVC126ANSR accepts input voltages up to 5.5V regardless of V_CC level, enabling direct interfacing with 5V logic families while powered from 1.65V–3.6V supplies. This overvoltage tolerance is guaranteed across the full –40°C to +125°C temperature range and eliminates need for external level-shifting components in mixed-voltage systems using the SN74LVC126ANSR.

Does the SN74LVC126ANSR require external pull-down resistors on OE pins?

Yes-the SN74LVC126ANSR requires pulldown resistors on all OE pins (pins 1, 4, 10, 13) to ensure outputs remain in high-impedance state during power-up and power-down sequences. The minimum resistor value depends on the current-sourcing capability of the driving circuit; typical values range from 1 kΩ to 10 kΩ. This requirement applies to every instance of SN74LVC126ANSR in system design.

What is the thermal resistance (RθJA) of the SN74LVC126ANSR in its NS package?

The SN74LVC126ANSR in SOP-14 (NS) package has a junction-to-ambient thermal resistance (RθJA) of 123.8°C/W, measured per JESD 51-7. This value assumes standard JEDEC high-K test board conditions and confirms suitability for operation up to +125°C ambient when mounted with adequate copper pour and thermal vias-critical for sustained performance in compact SSD and audio dock assemblies using SN74LVC126ANSR.

Can the SN74LVC126ANSR drive a 50-pF load at 100 MHz?

The SN74LVC126ANSR is characterized for 50-pF loads in switching tests and achieves 4.7ns max t_pd at 3.3V, supporting reliable operation up to ~100 MHz with appropriate layout (controlled impedance, short traces, proper termination). Its 24 mA drive strength and low C_pd (22 pF) make it capable of driving 50-pF loads at that frequency-provided PCB routing minimizes parasitic inductance and ground bounce, as verified in actual SN74LVC126ANSR application circuits.

Is the SN74LVC126ANSR pin-compatible with other LVC126 variants in different packages?

Yes-the SN74LVC126ANSR shares identical pin configuration and function mapping with all other SN74LVC126A variants (e.g., D, DB, PW, RGY), including pin 1 (1OE), pin 2 (1A), pin 3 (1Y), through pin 14 (V_CC). This uniformity allows drop-in replacement across package types without schematic or layout changes, provided mechanical clearance and thermal design accommodate the specific package dimensions of the SN74LVC126ANSR or alternate variant.