Texas Instruments SN74LVC126ADGVR

Overview

SN74LVC126ADGVR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for 1.65V–3.6V V_CC operation. It provides four independent non-inverting buffers, each with dedicated output-enable (OE) control, 5.5V-tolerant inputs, and maximum 4.7ns propagation delay at 3.3V - enabling reliable level translation and bus isolation in mixed-voltage digital systems such as SSD controllers and AV receivers.

For engineers reviewing the SN74LVC126ADGVR datasheet, SN74LVC126ADGVR pinout, SN74LVC126ADGVR application, or SN74LVC126ADGVR equivalent, key selection criteria include its 14-pin TVSOP package, –40°C to +125°C operating range, 3.3V/5V input compatibility, and precise 3-state timing parameters (t_en, t_dis) critical for synchronous bus arbitration and hot-swap interface design.

Technical Context

The SN74LVC126ADGVR implements four identical CMOS buffer channels, each performing Y = A logic with active-low 3-state control. Its input structure accepts voltages up to 5.5V regardless of V_CC, supporting down-translation from 5V logic to 3.3V or 1.8V domains without external components.

Each channel features independent OE control, enabling selective bus gating. The device uses standard LVC process technology with balanced rise/fall times, specified switching characteristics across full temperature and voltage ranges, and robust ESD protection (±2000V HBM), making it suitable for industrial and consumer-grade board-level signal routing where bus contention avoidance and power-up state control are essential.

Key Specifications

Pinout & Package

SN74LVC126ADGVR is housed in a 14-pin Thin Very Small Outline Package (TVSOP, DGV), measuring 3.60mm × 6.4mm body size with 0.65mm lead pitch. The exposed pad is not present; thermal management relies on PCB copper area under leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC126APWR and SN74LVC126ADR, the SN74LVC126ADGVR offers the smallest footprint among pin-compatible variants (3.60mm × 6.4mm), optimized thermal resistance for high-density layouts, and identical 3.3V/5V translation capability - making it ideal for space-constrained SSD and portable AV designs requiring production scalability.

Availability

SN74LVC126ADGVR is available at Aetrix Electronics and suitable for SSD controller interfaces, AV receiver signal routing, industrial PLC I/O expansion, and tablet display interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC126ADGVR 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 connectivity technologies, with over 90 years of innovation in precision electronics and industrial-grade IC design.

The SN74LVC126A family belongs to TI's LVC logic portfolio, engineered for low-voltage, high-speed digital interfacing in mixed-signal systems - targeting applications where voltage translation, bus isolation, and thermal resilience are critical.

FAQ

What is the maximum input voltage rating for SN74LVC126ADGVR?

The SN74LVC126ADGVR supports input voltages up to 5.5V regardless of V_CC level - a key feature enabling direct interfacing with 5V logic families while operating from 1.65V–3.6V supplies. This tolerance is verified per absolute maximum ratings and applies to all input pins (1A–4A, 1OE–4OE), eliminating need for external clamping or level-shifting circuits in mixed-voltage systems.

Does SN74LVC126ADGVR require external pull-down resistors on OE pins?

Yes - to ensure high-impedance outputs during power-up and power-down sequences, each OE pin of the SN74LVC126ADGVR must be tied to GND through an external pulldown resistor. The minimum resistance value depends on the current-sourcing capability of the driving source; typical values range from 1kΩ to 10kΩ. This requirement is explicitly stated in the functional description and device functional modes section of the datasheet.

What is the thermal resistance (R_θJA) of SN74LVC126ADGVR in its TVSOP package?

The junction-to-ambient thermal resistance (R_θJA) for SN74LVC126ADGVR in the DGV (TVSOP-14) package is 140.9°C/W, measured per JESD 51-7. This value assumes standard JEDEC high-K test board conditions and reflects the package's ability to dissipate heat in typical PCB layouts. For improved thermal performance, designers should maximize copper area connected to GND and V_CC pins.

Can SN74LVC126ADGVR drive 50Ω transmission lines directly?

No - SN74LVC126ADGVR is not designed as a transmission-line driver. Its output structure targets CMOS load conditions (e.g., capacitive loads ≤50pF, fanout to multiple LVC inputs). Driving 50Ω lines requires controlled-impedance line drivers with matched output resistance; using SN74LVC126ADGVR in such configurations may cause signal reflections, overshoot, or timing violations. For 50Ω applications, TI recommends dedicated line drivers like SN65LVDS1 or SN65LVDS2.

Is SN74LVC126ADGVR pin-compatible with other packages in the SN74LVC126A family?

Yes - SN74LVC126ADGVR shares identical pin configuration and function mapping with all other SN74LVC126A variants (e.g., D, DB, PW, RGY), as confirmed by the Pin Functions table and Figure 4-1/4-2 in the datasheet. All 14-pin versions implement the same 1OE–1A–1Y–2OE–2A–2Y–GND–V_CC–3Y–3A–3OE–4Y–4A–4OE ordering, enabling drop-in substitution across packages when thermal and layout constraints permit.