Texas Instruments SN74LVC1G126DCKJ

Overview

SN74LVC1G126DCKJ from Texas Instruments is a single non-inverting bus buffer gate with 3-state output, designed for level translation and bidirectional bus isolation in compact logic interfaces. It operates from 1.65V to 5.5V VCC, accepts inputs up to 5.5V, delivers ±24mA drive at 3.3V, achieves 3.7ns max propagation delay, and supports live insertion via Ioff. It is used in high-speed data acquisition systems where space-constrained, low-power, voltage-flexible buffering is required.

For engineers reviewing the SN74LVC1G126DCKJ datasheet, SN74LVC1G126DCKJ pinout, SN74LVC1G126DCKJ application, or SN74LVC1G126DCKJ equivalent, key selection criteria include its 3-state control timing (ten/tdis ≤ 5.5ns at 3.3V), over-voltage tolerant inputs, NanoFree™ SC70-5 package footprint, and compatibility with mixed-voltage signal routing in industrial and communications subsystems.

Technical Context

The SN74LVC1G126DCKJ implements a CMOS-based non-inverting buffer with active-high output-enable (OE) control, enabling true pass-through (A→Y) when OE = HIGH and high-impedance tri-state when OE = LOW. Its balanced CMOS output stage provides symmetrical sourcing/sinking capability up to ±24mA at 3.3V, supporting clean signal integrity into light capacitive loads (≤50pF).

It features Ioff circuitry that disables all outputs during partial power-down (VCC = 0V), limiting leakage to ±10μA, and includes over-voltage tolerant inputs rated to 5.5V independent of VCC - enabling safe interfacing between 5V peripherals and lower-voltage logic domains without external level shifters.

Key Specifications

Pinout & Package

SN74LVC1G126DCKJ uses the Texas Instruments SC70-5 (DCK) package: 2.0mm × 2.1mm body size, 5-pin surface-mount, lead-free and RoHS-compliant. Pin 1 is A (data input), Pin 2 is GND, Pin 3 is Y (3-state output), Pin 4 is OE (output enable), Pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G126DCKJ, SN74LVC1G125DCKR offers identical timing and drive but inverted logic, while NC7SZ126P5X provides AEC-Q100 qualification and tighter production tolerances - making it preferable for automotive or mission-critical industrial use where reliability documentation is mandatory.

Availability

SN74LVC1G126DCKJ is available at Aetrix Electronics and suitable for high-speed data acquisition, cable modem termination systems, and industrial motor control applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.

Supply support for SN74LVC1G126DCKJ 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 decades of expertise in high-reliability, low-power interface ICs.

The SN74LVC1G126DCKJ belongs to TI's LVC logic family - engineered for voltage flexibility, low static/dynamic power, and robust signal integrity in space-constrained, mixed-voltage digital systems.

FAQ

What is the maximum operating temperature for SN74LVC1G126DCKJ?

The SN74LVC1G126DCKJ is rated for operation from –40°C to +125°C ambient temperature. This extended range is validated per JEDEC JESD78 Class II latch-up testing and supported by thermal metrics including RθJA = 371°C/W for the DCK package, enabling reliable deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment where thermal margins are critical. The SN74LVC1G126DCKJ maintains full electrical compliance across this range.

Does SN74LVC1G126DCKJ support 5V-tolerant inputs when VCC = 1.8V?

Yes, SN74LVC1G126DCKJ supports input voltages up to 5.5V regardless of VCC level - including when VCC = 1.8V. This over-voltage tolerance is implemented via internal protection circuitry without positive clamp diodes, allowing direct connection to 5V sources without external components. The SN74LVC1G126DCKJ datasheet explicitly specifies VI = 0 to 5.5V under Recommended Operating Conditions, confirming safe operation in mixed-voltage interfaces.

What is the recommended bypass capacitor for SN74LVC1G126DCKJ?

Texas Instruments recommends a 0.1μF ceramic bypass capacitor placed physically adjacent to the SN74LVC1G126DCKJ VCC and GND pins, with low-inductance routing to minimize supply noise. For enhanced high-frequency noise rejection, a parallel 1μF capacitor is advised. Layout guidelines specify using wide traces, an unbroken ground plane beneath signal paths, and placement on the same PCB layer as the SN74LVC1G126DCKJ to maintain low impedance and ensure stable switching performance.

Can SN74LVC1G126DCKJ be used in hot-swap applications?

Yes, SN74LVC1G126DCKJ supports live insertion via its Ioff feature: when VCC = 0V, all outputs enter high-impedance state with leakage limited to ±10μA, preventing back-driving of powered subsystems. This makes the SN74LVC1G126DCKJ suitable for modular backplanes, pluggable I/O cards, and field-replaceable units where boards may be inserted into live chassis. The device also meets JESD78 Class II latch-up immunity (>100mA), further enhancing hot-swap robustness.

Is SN74LVC1G126DCKJ pin-compatible with other SC70-5 logic buffers?

SN74LVC1G126DCKJ has a fixed 5-pin SC70-5 pinout (A-GND-Y-OE-VCC) that matches industry-standard SC70-5 logic buffers such as SN74LVC1G125 and NC7SZ126. However, functional compatibility requires verification: SN74LVC1G126DCKJ is non-inverting, while SN74LVC1G125 is inverting. Physical pin alignment is identical, but substituting without logic review risks signal inversion errors. Always confirm truth table alignment before drop-in replacement.