Texas Instruments SN74LVC1G126YZAR

Overview

SN74LVC1G126YZAR from Texas Instruments is a single 3-state noninverting buffer gate designed for 1.65-V to 5.5-V operation, delivering 3.7 ns max propagation delay at 3.3 V, ±24-mA output drive, and Ioff partial-power-down support. It serves as a level-translating bus driver in low-voltage microcontroller I/O expansion, FPGA configuration interfaces, and portable sensor hub signal conditioning.

For engineers reviewing the SN74LVC1G126YZAR datasheet, SN74LVC1G126YZAR pinout, SN74LVC1G126YZAR application, or SN74LVC1G126YZAR equivalent, key selection criteria include its 5-pin NanoFree™ WCSP package, 10-µA max ICC, ±50-mA absolute output current rating, and JESD 78 Class II latch-up compliance - all critical for space-constrained, battery-powered, and mixed-voltage system designs.

Technical Context

This device implements a CMOS-based noninverting buffer with active-high output-enable control (OE), where Y follows A when OE = HIGH and enters high-impedance state when OE = LOW. Its Ioff circuitry actively disables outputs during power-down to prevent backflow current, enabling safe hot-insertion in multi-rail systems.

Input voltage tolerance extends to 5.5 V regardless of VCC (1.65–5.5 V), supporting true 5-V-tolerant inputs on sub-3.3-V supplies. The logic diagram confirms direct signal path from A to Y with no inversion, and absolute maximum ratings specify −0.5 V to 6.5 V on all pins - essential for robustness in noisy or mismatched supply environments.

Key Specifications

Pinout & Package

NanoFree™ WCSP (YZA) package: 5-ball, 0.4-mm pitch, 0.8 mm × 0.8 mm footprint, Pb-free (SnAgCu), bottom-side ball layout with pin 1 marked by • (Pb-free solder bump).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single 3-state buffer applications.

Compared with SN74LVC1G125YZAR and SN74LVC1G17YZAR, the SN74LVC1G126YZAR provides deterministic noninverting behavior and lowest input capacitance - making it optimal for timing-critical, polarity-sensitive, and high-density routing scenarios where signal fidelity and minimal loading are prioritized.

Availability

SN74LVC1G126YZAR is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, and automotive body-control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant nano-packaged logic.

Supply support for SN74LVC1G126YZAR 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, with over 90 years of innovation in high-reliability, energy-efficient components.

The SN74LVC1G126YZAR belongs to TI's LVC logic family - engineered for low-voltage operation, high noise immunity, and seamless integration in space-constrained, battery-powered, and mixed-supply digital systems.

FAQ

What is the recommended power supply decoupling for SN74LVC1G126YZAR?

A 0.1-µF X7R ceramic capacitor placed within 1 mm of the VCC and GND balls is required for stable operation. This minimizes supply bounce during output transitions and ensures consistent 3.7 ns propagation delay performance. The SN74LVC1G126YZAR exhibits 206°C/W thermal resistance in its YZA package, so localized decoupling also prevents localized heating that could affect timing margins in high-duty-cycle applications.

Does SN74LVC1G126YZAR support hot-swap insertion?

Yes, SN74LVC1G126YZAR supports hot-swap insertion due to its Ioff circuitry, which limits current to ±10 µA when VCC = 0 V and any input or output is biased to 5.5 V. This prevents damaging backfeed current into unpowered circuit sections - a requirement verified per JESD 78 Class II latch-up testing and confirmed in the absolute maximum ratings table of the SCES224M datasheet.

Can SN74LVC1G126YZAR drive a 50-pF load at 10 MHz without signal degradation?

Yes, SN74LVC1G126YZAR maintains signal integrity driving a 50-pF load at 10 MHz: its typical output capacitance (Cpd) is 19 pF when enabled, and measured tpd remains ≤4.5 ns under CL = 50 pF conditions at 3.3 V. The ±24-mA drive strength ensures <0.55 V VOL at 24-mA sink, preserving noise margin across the full operating temperature range (−40°C to 85°C).

What is the minimum pull-down resistor value needed on OE for reliable power-up behavior of SN74LVC126YZAR?

The minimum OE pulldown resistor value is determined by the current-sourcing capability of the OE driver - TI recommends ≥10-kΩ for standard CMOS drivers. For SN74LVC1G126YZAR, a 10-kΩ resistor ensures OE remains below 0.8 V (VIL max at 3.3 V) during power ramp, guaranteeing Y stays in high-Z until firmware asserts OE HIGH. This prevents bus contention during boot sequences in systems with multiple SN74LVC1G126YZAR devices.

Is SN74LVC1G126YZAR pin-compatible with other 5-pin LVC single-gate packages like DBV or DCK?

No, SN74LVC1G126YZAR uses a 5-ball NanoFree™ WCSP (YZA) bottom-terminal layout, while DBV (SOT-23) and DCK (SC-70) are top-leaded 5-pin packages with different pin assignments and physical dimensions. Although functional equivalence exists across the SN74LVC1G126 family, mechanical replacement requires PCB redesign - the YZA package has no pin-to-pin mapping to leaded variants.