Texas Instruments SN74AUC1G126DBVR

Overview

SN74AUC1G126DBVR from Texas Instruments is a single-channel CMOS bus buffer gate with tri-state output, designed for 1.65–1.95 V operation and 3.6-V I/O tolerant inputs. It delivers ±8 mA output drive at 1.8 V, achieves 1.6 ns typical propagation delay (CL = 15 pF), and supports partial power-down via Ioff. It is used in portable audio interfaces and LED indicator circuits where low-voltage logic translation and bus isolation are required.

For engineers reviewing the SN74AUC1G126DBVR datasheet, SN74AUC1G126DBVR pinout, SN74AUC1G126DBVR application, or SN74AUC1G126DBVR equivalent, key selection criteria include its 1.8-V optimized timing, 3.6-V input tolerance for mixed-voltage systems, tri-state control via OE, sub-1-V operability, and NanoFree™ SOT-23 package footprint compatibility.

Technical Context

The SN74AUC1G126DBVR implements a non-inverting buffer (Y = A) with active-high output enable (OE). Its balanced CMOS push-pull output stage enables symmetrical sourcing/sinking capability up to ±8 mA at 1.8 V, while standard CMOS inputs support fast edge rates (≤10 ns/V at 1.65–1.95 V) and tolerate voltages up to 3.6 V independent of VCC.

It features integrated negative clamping diodes on all I/O pins, Ioff circuitry that disables outputs and limits leakage to ±10 µA when VCC = 0 V, and guaranteed high-impedance state during power sequencing when OE is pulled low via external resistor. The device operates across –40°C to +85°C with supply range 0.8–2.7 V.

Key Specifications

Pinout & Package

SOT-23 (DBV) 5-pin package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G126DBVR and NC7SZ126P5X, the SN74AUC1G126DBVR offers superior speed and lower VCC minimum for 1.8-V-centric designs, while its 3.6-V input tolerance provides broader interoperability than NC7SZ126P5X's 5.5-V rating without sacrificing nano-footprint efficiency.

Availability

SN74AUC1G126DBVR is available at Aetrix Electronics and suitable for portable audio interfaces, LED indicator circuits, and low-voltage bus isolation requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74AUC1G126DBVR 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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and logic devices.

The SN74AUC1G126DBVR belongs to TI's AUC ultra-low-voltage logic family, engineered specifically for high-speed, low-power operation in portable and battery-constrained applications operating at 1.8 V and below.

FAQ

What is the recommended pull-down resistor value for OE on SN74AUC1G126DBVR?

The OE pin must be tied to GND through a pulldown resistor to ensure high-impedance state during power-up. TI specifies the minimum resistance based on the driver's current-sinking capability - typically 10 kΩ is sufficient for most applications. For high-noise environments, a lower value (e.g., 4.7 kΩ) improves noise immunity without excessive current draw, since ICC remains ≤10 µA.

Can SN74AUC1G126DBVR operate reliably at 0.9 V VCC?

Yes, SN74AUC1G126DBVR is fully specified from 0.8 V to 2.7 V. At 0.9 V, it maintains functional logic behavior with verified VIH/VIL thresholds and sub-10 µA ICC. However, propagation delay increases (e.g., ~4.5 ns at 0.8 V, CL = 15 pF), and output drive drops to ~±0.7 mA - adequate for low-load signaling but not for driving LEDs or heavy capacitive loads.

Does SN74AUC1G126DBVR support hot-swap applications?

Yes, SN74AUC1G126DBVR supports hot-swap via its Ioff feature: when VCC = 0 V, all I/O pins enter high-impedance with ±10 µA leakage, preventing back-drive current into powered circuitry. This makes it suitable for live-insertion scenarios in modular SSDs or field-replaceable embedded modules where rail sequencing is uncontrolled.

Is SN74AUC1G126DBVR pin-compatible with other 5-pin logic buffers?

SN74AUC1G126DBVR uses standard SOT-23 (DBV) pinout (OE-A-GND-Y-VCC), matching industry-standard 5-pin logic buffers like SN74LVC1G126DBVR and NC7SZ126P5X. Mechanical compatibility is confirmed, but electrical differences (VCC range, drive strength, timing) require validation in final design - it is not a drop-in replacement without review.

What is the maximum capacitive load SN74AUC1G126DBVR can drive while maintaining timing specs?

TI characterizes SN74AUC1G126DBVR at CL = 15 pF and CL = 30 pF. At 1.8 V, tpd increases from 1.6 ns (15 pF) to 2.5 ns (30 pF); ten/tdis scale similarly. For reliable timing margin, keep total load ≤30 pF - including trace capacitance (~0.1–0.2 pF/mm), probe effects, and receiver input capacitance. Exceeding this degrades edge integrity and may cause setup/hold violations.