Texas Instruments SN74AHC1G126DCKR

Overview

SN74AHC1G126DCKR from Texas Instruments is a single-channel CMOS bus buffer gate with 3-state output, designed for level-shifting and bus isolation in low-power digital systems. It operates from 2 V to 5.5 V, delivers ±8 mA output drive at 5 V, achieves 6 ns max propagation delay at 5 V, and consumes ≤10 µA ICC. It serves in signal routing between mixed-voltage domains in compact consumer and industrial electronics.

For engineers reviewing the SN74AHC1G126DCKR datasheet, SN74AHC1G126DCKR pinout, SN74AHC1G126DCKR application, or SN74AHC1G126DCKR equivalent, key selection criteria include its 5-pin SC-70 package, 3-state enable control timing (tPZH/tPHZ), 5.5-V-tolerant inputs, and guaranteed high-impedance state during power sequencing.

Technical Context

The SN74AHC1G126DCKR implements a noninverting buffer with active-high output-enable logic: when OE is high, A passes to Y; when OE is low, Y enters high-impedance state. Its CMOS design supports down-translation - inputs accept up to 5.5 V regardless of VCC (2–5.5 V), enabling interfacing between higher-voltage peripherals and lower-voltage controllers.

It features balanced rise/fall times (Δt/Δv = 20 ns/V at 5 V), low dynamic power (Cpd = 14 pF), and robust ESD protection (±1500 V HBM). Thermal resistance in the DCK package is RθJA = 289.2 °C/W, requiring attention to PCB copper area and airflow in thermally constrained layouts.

Key Specifications

Pinout & Package

SN74AHC1G126DCKR uses the SC-70 (DCK) 5-pin surface-mount package, measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), with gull-wing leads optimized for automated assembly and space-constrained PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G126DCKR and 74AUP1G126GW,125, the SN74AHC1G126DCKR uniquely balances wide voltage support (2–5.5 V), 5.5-V-tolerant inputs, and moderate speed/power - making it the only choice for mixed-rail industrial interfaces where reliability across voltage transitions is mandatory.

Availability

SN74AHC1G126DCKR is available at Aetrix Electronics and suitable for projectors, TVs, servers, and patient monitoring equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74AHC1G126DCKR 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 SN74AHC1G126DCKR belongs to TI's AHC logic family, engineered for low-power, high-noise-immunity digital interfacing in space- and energy-constrained applications.

FAQ

What is the maximum operating voltage for SN74AHC1G126DCKR?

The SN74AHC1G126DCKR supports a supply voltage range of 2 V to 5.5 V. Its inputs tolerate up to 5.5 V regardless of VCC level, enabling safe interfacing with 5 V peripherals even when powered from 2.5 V or 3.3 V rails. Absolute maximum VCC is 7 V, but sustained operation above 5.5 V violates recommended conditions and risks reliability degradation.

Does SN74AHC1G126DCKR support level translation?

Yes - the SN74AHC1G126DCKR provides down-translation capability: its inputs accept voltages up to 5.5 V independently of VCC, allowing connection to higher-voltage buses while operating from lower supply rails (e.g., 3.3 V or 2.5 V). It does not support up-translation; outputs swing only between GND and the applied VCC.

How is the high-impedance state ensured during power-up for SN74AHC1G126DCKR?

To guarantee the SN74AHC1G126DCKR output remains in high-impedance during power sequencing, tie OE to GND via a pulldown resistor. TI specifies minimum resistor value based on driver sourcing capability; a 10 kΩ resistor is typical. This prevents unintended bus driving before system controllers initialize OE.

What thermal considerations apply to SN74AHC1G126DCKR in the SC-70 package?

The SN74AHC1G126DCKR in SC-70 has RθJA = 289.2 °C/W. At 8 mA output current and 5 V supply, power dissipation remains <0.5 mW in static operation, but switching increases junction temperature significantly. For continuous 10 MHz toggling, maintain ≥100 mm² of 1-oz copper pour under the package and avoid stacking heat-generating components nearby.

Can SN74AHC1G126DCKR drive multiple 74AHC inputs reliably?

Yes - with ±8 mA output drive at 5 V, the SN74AHC1G126DCKR can drive at least 10 standard 74AHC inputs (each drawing ~1 µA IIL/IIH) while maintaining valid logic levels. For capacitive loads >30 pF or fan-out >20, add series termination or reduce edge rates using input RC filtering to prevent ringing.