Texas Instruments SN74LVC126APWRE4

Overview

SN74LVC126APWRE4 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 CMOS buffers with 5.5V-tolerant inputs, 4.7ns max propagation delay at 3.3V, and operates across –40°C to +125°C - enabling use in high-speed digital interface isolation and voltage translation between 3.3V and 5V domains in consumer audio/video systems.

For engineers reviewing the SN74LVC126APWRE4 datasheet, SN74LVC126APWRE4 pinout, SN74LVC126APWRE4 application, or SN74LVC126APWRE4 equivalent, key selection considerations include 3-state output timing (t_en/t_dis), input overvoltage tolerance, thermal performance in TSSOP-14, and compatibility with mixed-voltage logic buses in space-constrained AV receivers and SSD controllers.

Technical Context

The SN74LVC126APWRE4 implements four identical non-inverting buffer gates, each controlled by an independent active-low output-enable (OE) input. Its 3-state outputs support bus sharing and signal direction control in multi-driver systems, with guaranteed high-impedance state during power-up when OE is pulled low via external resistor.

It uses advanced LVC CMOS technology to achieve rail-to-rail output swing, sub-5ns propagation delay, and robust ESD protection (±2000V HBM). Input voltage tolerance up to 5.5V enables reliable down-translation from legacy 5V logic into 3.3V or lower domains without level-shifter circuitry.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 5.00mm × 4.40mm body size, 14-pin surface-mount with exposed thermal pad connected to GND for improved thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC126APWRE4, SN74LVC125APWRE4 requires OE polarity adaptation in control logic, while 74LVC126PW,118 offers identical functionality with minor timing trade-off - both preserve TSSOP-14 mechanical compatibility and mixed-voltage interface capability.

Availability

SN74LVC126APWRE4 is available at Aetrix Electronics and suitable for AV receiver signal routing, SSD controller interface buffering, portable audio dock level translation, and industrial HMI display interface requiring stable component supply across automotive, industrial, and consumer electronics programs.

Supply support for SN74LVC126APWRE4 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 consumer markets.

The SN74LVC126APWRE4 belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-signal interface applications where voltage translation, bus isolation, and timing predictability are critical.

FAQ

What is the maximum operating voltage on the inputs of the SN74LVC126APWRE4?

The SN74LVC126APWRE4 inputs tolerate up to 5.5V regardless of V_CC level - enabling direct connection to 5V logic without external protection. This specification is guaranteed across the full operating temperature range (–40°C to +125°C) and applies to all four input pins (1A, 2A, 3A, 4A) of the SN74LVC126APWRE4.

Does the SN74LVC126APWRE4 require external pull-down resistors on OE pins?

Yes - to ensure high-impedance outputs during power-up or brown-out, each OE pin of the SN74LVC126APWRE4 must be tied to GND via a pulldown resistor. The minimum resistance value depends on the current-sourcing capability of the driving source; typical values range from 1kΩ to 10kΩ for most MCU GPIO implementations controlling the SN74LVC126APWRE4.

What is the thermal resistance (RθJA) of the SN74LVC126APWRE4 in its TSSOP-14 package?

The SN74LVC126APWRE4 in the PW (TSSOP-14) package has a junction-to-ambient thermal resistance (RθJA) of 150.8°C/W under standard JEDEC test conditions. This value assumes a two-layer PCB with minimal copper; actual thermal performance improves significantly with internal ground planes and thermal vias connected to the exposed pad.

Can the SN74LVC126APWRE4 drive multiple CMOS inputs simultaneously?

Yes - the SN74LVC126APWRE4 delivers ±24mA per output at V_CC = 3V, allowing it to drive 10–15 standard CMOS inputs (each ~1–2pF) while maintaining specified propagation delay and output voltage levels. Total device output current must remain ≤50mA to avoid exceeding absolute maximum ratings.

Is the SN74LVC126APWRE4 pin-compatible with other members of the SN74LVC126A family?

Yes - all SN74LVC126A variants (e.g., SN74LVC126ADR, SN74LVC126APWR, SN74LVC126ABQAR) share identical pinout and function across SOIC, TSSOP, WQFN, and VQFN packages. The SN74LVC126APWRE4 specifically uses the PW (TSSOP-14) footprint and is mechanically and electrically interchangeable with other PW-packaged versions like SN74LVC126APWR.