Texas Instruments 74AHC1G126DCKRE4

Overview

74AHC1G126DCKRE4 from Texas Instruments is a single 3-state bus buffer gate used for signal isolation and bidirectional bus control 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 features 5.5-V-tolerant inputs - enabling voltage-level translation in mixed-supply interfaces such as microcontroller I/O expansion or LED driver enable logic.

For engineers reviewing the 74AHC1G126DCKRE4 datasheet, 74AHC1G126DCKRE4 pinout, 74AHC1G126DCKRE4 application, or 74AHC1G126DCKRE4 equivalent, key selection criteria include its SC-70-5 package footprint, guaranteed 3-state high-impedance output behavior, input voltage tolerance beyond VCC, and thermal performance under industrial temperature range (–40°C to +125°C).

Technical Context

This device implements a noninverting buffer with active-high output-enable control, where OE = HIGH enables true A→Y signal pass-through and OE = LOW forces Y into high-impedance state. Its CMOS AHC logic family ensures rail-to-rail output swing, low static current (≤10 µA), and compatibility with both 3.3 V and 5 V system domains.

The 74AHC1G126DCKRE4 supports down-translation: inputs accept up to 5.5 V regardless of VCC (e.g., 3.3 V supply with 5 V input signals), while outputs swing between GND and VCC. Its switching characteristics are specified across load capacitances (15 pF and 50 pF) and full industrial temperature range, with propagation delays tightly bounded at 7 ns max (VCC = 5 V, CL = 15 pF, –40°C to +125°C).

Key Specifications

Pinout & Package

74AHC1G126DCKRE4 uses the SC-70 (DCK) 5-pin surface-mount package, measuring 2.0 mm × 2.1 mm (body: 2.0 mm × 1.25 mm), optimized for space-constrained PCB layouts in portable and embedded systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G126DBVR and 74AUP1G126GW,125, the 74AHC1G126DCKRE4 uniquely balances 2 V minimum operation, 5.5 V input tolerance, and industrial temperature support - making it the only choice among the three for robust mixed-voltage industrial control interfaces.

Availability

74AHC1G126DCKRE4 is available at Aetrix Electronics and suitable for industrial motor controls, patient monitoring devices, and electronic points of sale requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC1G126DCKRE4 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 for industrial, automotive, and personal electronics markets.

The SN74AHC1G126 product line delivers single-channel 3-state buffers optimized for voltage translation, bus isolation, and low-power signal routing in space- and power-constrained embedded systems.

FAQ

What is the maximum operating voltage for the 74AHC1G126DCKRE4?

The 74AHC1G126DCKRE4 supports a supply voltage range of 2 V to 5.5 V. Its absolute maximum rating is 7 V on VCC, but functional operation is guaranteed only up to 5.5 V. Exceeding 5.5 V may cause parametric degradation or reliability risk, and is not supported per TI's recommended operating conditions.

Does the 74AHC1G126DCKRE4 support 5 V input signals when powered from 3.3 V?

Yes - the 74AHC1G126DCKRE4 features 5.5-V-tolerant inputs. When VCC = 3.3 V, inputs A and OE can safely accept 0–5.5 V logic levels without damage or clamping diode conduction, enabling seamless down-translation in mixed-voltage systems.

What is the guaranteed propagation delay for the 74AHC1G126DCKRE4 at 125°C?

At VCC = 5 V, CL = 15 pF, and TA = –40°C to +125°C, the 74AHC1G126DCKRE4 has a maximum propagation delay (tPLH/tPHL) of 7 ns. This value is explicitly specified in Section 5.7 of the datasheet and applies across the full industrial temperature range.

How should the OE pin be handled during power-up to avoid undefined output states?

To ensure the 74AHC1G126DCKRE4 output remains in high-impedance during power sequencing, tie OE to GND through a pulldown resistor. TI recommends a value selected based on the driving source's current-sourcing capability - typically 10 kΩ suffices for most MCU GPIOs - to guarantee OE stays LOW until system firmware asserts control.

Is the 74AHC1G126DCKRE4 RoHS compliant and lead-free?

Yes - the 74AHC1G126DCKRE4 is RoHS compliant and features a lead-free NIPDAU (nickel/palladium/gold) terminal finish. Its MSL rating is Level-1 at 260°C, and it ships in tape-and-reel packaging (3000 units per reel) with full traceability documentation available upon request.