Nexperia USA Inc. 74AHC2G126DC,125

Overview

74AHC2G126DC,125 from Nexperia is a dual CMOS buffer/line driver with independent 3-state outputs, designed for bidirectional bus interfacing and voltage-level translation in mixed-supply systems. It operates from 2.0 V to 5.5 V, features overvoltage-tolerant inputs up to 5.5 V, delivers propagation delays as low as 3.4 ns (VCC = 5.0 V, CL = 15 pF), and supports full industrial temperature range (–40 °C to +125 °C). Used in FPGA I/O expansion, microcontroller peripheral buffering, and legacy-to-modern logic interface circuits.

For engineers reviewing the 74AHC2G126DC,125 datasheet, 74AHC2G126DC,125 pinout, 74AHC2G126DC,125 application, or 74AHC2G126DC,125 equivalent, key selection criteria include its dual-channel 3-state control, input level compatibility (CMOS for AHC variant), symmetrical output drive strength, thermal robustness at 125 °C ambient, and VSSOP8 package footprint for high-density PCB layouts.

Technical Context

This device implements two independent non-inverting buffers, each with an active-HIGH output enable (nOE) controlling high-impedance state on the corresponding output (nY). Input logic thresholds are CMOS-compatible (VIH ≥ 3.85 V at VCC = 5.5 V), enabling reliable operation across 2.0–5.5 V supply rails without external level shifters.

Its overvoltage-tolerant inputs (rated to 5.5 V regardless of VCC) allow safe interfacing between higher-voltage peripherals (e.g., 5 V sensors) and lower-voltage controllers (e.g., 3.3 V MCU GPIO), while maintaining rail-to-rail output swing and sub-10 ns propagation delay under typical loads.

Key Specifications

Pinout & Package

VSSOP8 plastic very thin shrink small outline package (SOT765-1); 8 leads; body width 2.3 mm; pin 1 indicator located below marking code in lower-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT2G126DC,125, the AHC variant offers superior noise immunity in mixed-voltage systems due to higher VIH, while SN74LVC2G126DCUR trades industrial temperature capability for lower static current-making the 74AHC2G126DC,125 optimal for thermally demanding, noise-sensitive industrial interfaces.

Availability

74AHC2G126DC,125 is available at Aetrix Electronics and suitable for industrial sensor interface, FPGA I/O expansion, and microcontroller peripheral buffering requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for 74AHC2G126DC,125 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

Nexperia is a global semiconductor expert delivering high-performance logic, discrete, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial and consumer electronics.

The 74AHC series targets high-speed, low-power CMOS logic applications requiring robust noise immunity and wide supply flexibility - especially in space-constrained, thermally demanding systems.

FAQ

Can 74AHC2G126DC,125 operate with VCC = 2.5 V while accepting 5 V inputs?

Yes. Its inputs are overvoltage tolerant up to 5.5 V regardless of VCC level, so it safely accepts 5 V logic signals when powered from 2.5 V. Output swing remains rail-to-rail (0 V to 2.5 V), preserving logic thresholds for downstream 2.5 V receivers. No external clamping or resistive dividers are needed.

What is the maximum capacitive load this device can drive while maintaining specified timing?

The datasheet specifies propagation delay (tpd) and enable/disable times up to 50 pF load capacitance. At CL = 50 pF and VCC = 5.0 V, tpd is 4.8 ns (max), ten is 5.1 ns (max), and tdis is 6.1 ns (max). Driving >50 pF increases delay nonlinearly and may exceed timing budgets in high-speed interfaces like SPI or parallel buses.

Does this part support hot-swap or live-insertion into a powered system?

No. While inputs tolerate overvoltage, the device lacks powered-off protection (Ioff) specification. Applying input signals before VCC ramp-up risks undefined states and potential shoot-through current. Power sequencing must ensure VCC is stable before asserting any inputs or OE signals.

How does the 3-state output behavior change near the upper temperature limit (+125 °C)?

At +125 °C, the high-impedance leakage (IOZ) increases to 10 μA max (vs. 0.25 μA at 25 °C), and VOL rises to 0.55 V (at IO = 8 mA). This may reduce noise margin in high-impedance bus termination schemes. Designers should verify bus hold strength and termination resistor values under worst-case thermal conditions.