Texas Instruments SN74ALVC126PWR

Overview

SN74ALVC126PWR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for 1.65-V to 3.6-V V_CC operation. It features four independent non-inverting buffers, each controlled by its own output-enable (OE) input, delivering ±24-mA drive strength at 3.3 V and 3.1-ns max propagation delay. It is used in bidirectional data bus isolation and level translation between mixed-voltage logic domains in industrial control and embedded interface circuits.

For engineers reviewing the SN74ALVC126PWR datasheet, SN74ALVC126PWR pinout, SN74ALVC126PWR application, or SN74ALVC126PWR equivalent, key selection considerations include 14-pin TSSOP package compatibility, 3-state output timing (t_en/t_dis ≤ 3.8 ns), supply voltage flexibility (1.65–3.6 V), and ±24-mA drive capability at 3 V - all critical for low-voltage bus buffering and hot-swap-capable I/O staging.

Technical Context

The SN74ALVC126PWR implements four identical non-inverting buffer stages, each with dedicated active-high output-enable control. Each buffer transitions to high-impedance when its OE input is low, enabling independent channel gating without shared enable logic.

Its CMOS ALVC (Advanced Low-Voltage CMOS) process ensures rail-to-rail input thresholds (V_IH/V_IL scaled to V_CC), latch-up immunity >250 mA per JESD 17, and ESD robustness per JESD 22 (2000-V HBM, 200-V MM, 1000-V CDM), making it suitable for noisy industrial environments and board-level hot insertion.

Key Specifications

Pinout & Package

TSSOP-14 (PW) package: 4.4-mm width, 1.2-mm max height, 0.65-mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC126APWR and 74AVC126TTR, the SN74ALVC126PWR offers guaranteed ±24-mA drive across its full 1.65–3.6-V range and superior industrial ESD robustness (2000-V HBM), making it optimal for mixed-supply systems requiring consistent performance and ruggedness - especially where voltage scaling or field-replaceable modules are involved.

Availability

SN74ALVC126PWR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, low-voltage FPGA I/O expansion, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74ALVC126PWR 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 experience in logic, interface, and power management ICs.

The SN74ALVC126PWR belongs to TI's Advanced Low-Voltage CMOS (ALVC) logic family, engineered for high-speed, low-power, mixed-voltage bus interfacing in industrial, automotive, and communications equipment.

FAQ

What is the recommended power-up sequencing for SN74ALVC126PWR?

TI recommends tying all OE inputs to GND through a pulldown resistor during power-up to ensure outputs remain in high-impedance until V_CC stabilizes. The SN74ALVC126PWR has no strict V_CC/OE sequencing requirement, but this practice prevents bus contention. For the SN74ALVC126PWR, a 10-kΩ resistor suffices given its ±5-µA input leakage.

Can SN74ALVC126PWR operate reliably at 1.65 V with full timing specifications?

Yes - the SN74ALVC126PWR is fully characterized down to 1.65 V. At this minimum V_CC, t_pd is 5.6 ns (vs. 3.1 ns at 3.3 V), and output drive drops to ±4 mA, but all AC/DC specs remain guaranteed per the datasheet's recommended operating conditions table. This makes the SN74ALVC126PWR suitable for battery-powered systems operating near end-of-life voltage.

Is SN74ALVC126PWR pin-compatible with older 74-series logic buffers?

No - the SN74ALVC126PWR uses a 14-pin TSSOP (PW) package with a specific pinout (e.g., OE on pins 1/4/10/13, not shared enable), differing from legacy DIP or SOIC packages like SN74LS126. While functionally equivalent to quad 3-state buffers, physical pin mapping and voltage tolerance are not interchangeable with bipolar or older CMOS families.

Does SN74ALVC126PWR require external pull-up or pull-down resistors on unused inputs?

Yes - TI mandates that all unused inputs (A and OE) be tied to either V_CC or GND to prevent floating nodes, which could cause excessive ICC, oscillation, or ESD susceptibility. For OE pins, grounding is preferred to default outputs to high-Z; for unused A inputs, connection to V_CC or GND is acceptable. This requirement applies strictly to the SN74ALVC126PWR per SCBA004 application report guidance.

What thermal considerations apply to SN74ALVC126PWR in continuous operation?

The SN74ALVC126PWR has a θ_JA of 113°C/W in the PW package. At maximum 24-mA output drive and 3.3-V supply, worst-case power dissipation is ~80 mW per buffer (320 mW total), resulting in ~36°C junction rise above ambient. Ensure adequate PCB copper area and airflow; no heatsink is needed below 70°C ambient. Derating is unnecessary within −40°C to +85°C operating range.