Texas Instruments SN74LVC126ADRE4

Overview

SN74LVC126ADRE4 from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for 1.65V–3.6V V_CC operation. It supports 5.5V-tolerant inputs, delivers ≤4.7ns propagation delay at 3.3V, operates across –40°C to +125°C, and drives up to 24mA per output-enabling robust signal buffering in mixed-voltage digital interfaces such as MCU-to-peripheral data buses.

For engineers reviewing the SN74LVC126ADRE4 datasheet, SN74LVC126ADRE4 pinout, SN74LVC126ADRE4 application, or SN74LVC126ADRE4 equivalent, key selection criteria include 3-state control timing (t_en/t_dis), input overvoltage tolerance, thermal performance in SOIC-14, and compatibility with 3.3V/5V logic translation in high-density consumer and industrial PCBs.

Technical Context

The SN74LVC126ADRE4 implements four independent non-inverting buffers (Y = A), each controlled by a dedicated active-low output-enable (OE) input. Its CMOS design ensures rail-to-rail output swing (V_OH ≥ V_CC – 0.3V, V_OL ≤ 0.3V at 125°C) and low dynamic power (C_pd = 22pF at 3.3V, 10MHz).

Each buffer features 5.5V-tolerant inputs regardless of V_CC, enabling down-translation from 5V systems to 3.3V domains without level-shifters. The device requires external pulldown on OE pins during power sequencing to guarantee high-impedance state at startup, with latch-up immunity exceeding 250mA per JESD17.

Key Specifications

Pinout & Package

SN74LVC126ADRE4 uses the SOIC-14 (D) package: 8.65mm × 6.0mm body, 14-pin gull-wing lead frame, RoHS-compliant NiPdAu finish, MSL Level-1, and exposed pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC126ADRE4, SN74LVC125ADRE4 shifts OE polarity but preserves timing and voltage compatibility, while 74LVC126PW,118 trades thermal performance for smaller board area-making SN74LVC126ADRE4 optimal for thermally demanding, pin-compatible SOIC-based designs requiring active-low enable control.

Availability

SN74LVC126ADRE4 is available at Aetrix Electronics and suitable for industrial automation, consumer audio equipment, and solid-state storage applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for SN74LVC126ADRE4 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 decades of expertise in logic IC design and high-volume manufacturing.

The SN74LVC126A family was engineered for robust 3.3V/5V mixed-signal interfacing in cost-sensitive, high-reliability applications-from consumer electronics to industrial control-emphasizing low power, wide temperature range, and pin-compatible scalability.

FAQ

What is the maximum input voltage rating for SN74LVC126ADRE4?

The SN74LVC126ADRE4 supports input voltages up to 5.5V regardless of V_CC level, enabling safe interfacing with 5V logic sources while powered from 1.65V–3.6V supplies. This overvoltage tolerance eliminates external protection components and simplifies mixed-voltage system design. Absolute maximum input rating remains –0.5V to 6.5V per datasheet Section 5.1.

Does SN74LVC126ADRE4 require external pull-down resistors on OE pins?

Yes-SN74LVC126ADRE4 requires external pulldown resistors on all OE pins (1–4) to ensure outputs remain in high-impedance state during power-up and power-down sequences. TI specifies this as mandatory in Section 7.4; failure to implement may cause bus contention or undefined logic states. Resistor value depends on driver sourcing capability but typically ranges from 4.7kΩ to 10kΩ.

What is the typical power dissipation of SN74LVC126ADRE4 at 3.3V and 10MHz?

At V_CC = 3.3V and f = 10MHz, the SN74LVC126ADRE4 exhibits a typical power dissipation capacitance (C_pd) of 22pF per gate with outputs enabled, resulting in dynamic power consumption of approximately 2.4mW per active buffer. Total quiescent ICC is ≤40µA at 125°C, making it suitable for low-power portable and always-on industrial modules.

Can SN74LVC126ADRE4 drive multiple CMOS inputs simultaneously?

Yes-the SN74LVC126ADRE4 can drive up to 10 standard CMOS inputs (each ~10pF) at 3.3V while maintaining specified t_pd and VOH/VOL margins, thanks to its 24mA output drive capability. Layout best practices (short traces, proper termination, local bypassing) are essential to avoid ringing or timing skew when loading >50pF total capacitance.

Is SN74LVC126ADRE4 pin-compatible with other packages in the SN74LVC126A family?

No-SN74LVC126ADRE4 uses the SOIC-14 (D) package, which has different mechanical dimensions and thermal characteristics than WQFN (BQA), TSSOP (PW), or VQFN (RGY) variants. While all share identical pin functions and logic behavior, PCB footprints and reflow profiles differ; direct substitution requires layout revision unless the design incorporates mixed-package compatibility planning.