Nexperia USA Inc. 74AHC2G126DP,125

Overview

74AHC2G126DP,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 is rated for industrial temperature range (–40 °C to +125 °C). It is commonly used in I²C bus buffering, microcontroller GPIO expansion, and legacy-to-modern logic interface circuits.

For engineers reviewing the 74AHC2G126DP,125 datasheet, 74AHC2G126DP,125 pinout, 74AHC2G126DP,125 application, or 74AHC2G126DP,125 equivalent, key selection criteria include its dual-channel 3-state control architecture, input voltage tolerance enabling level-shifting without external circuitry, symmetrical output drive strength (±8 mA), and TSSOP8 package compatibility with 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). Its CMOS input threshold (VIH = 3.85 V at VCC = 5.5 V; VIL = 1.65 V) ensures robust noise immunity and compatibility with 3.3 V and 5 V logic families.

The functional behavior follows a strict truth table: when nOE = HIGH, nY mirrors nA; when nOE = LOW, nY enters high-Z. Input clamping diodes and ESD protection (HBM > 2000 V, CDM > 1000 V) support rugged operation in noisy industrial environments without external protection components.

Key Specifications

Pinout & Package

TSSOP8 package (SOT505-2): plastic thin shrink small outline, 8-lead, 3 mm body width, 0.65 mm pitch, exposed pad not present. Pin 1 index located at lower-left corner below marking "A26".

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC2G126DP,125, the 74AHC2G126DP,125 offers superior noise immunity at 5 V due to higher VIH and tighter VOL spec, while SN74LVC2G126DCUR provides equivalent performance in a thermally less efficient package but with broader regional distributor stock.

Availability

74AHC2G126DP,125 is available at Aetrix Electronics and suitable for industrial sensor hubs, I²C bus extension modules, and microcontroller GPIO expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC2G126DP,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 specializing in high-performance, reliable standard logic, discrete, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74AHC series targets high-speed, low-power CMOS logic applications demanding wide supply range, robust ESD tolerance, and extended temperature operation - optimized for space-constrained, thermally demanding embedded systems.

FAQ

Can 74AHC2G126DP,125 be used as a level shifter between 3.3 V and 5 V logic?

Yes - its overvoltage-tolerant inputs accept up to 5.5 V regardless of VCC setting, allowing 5 V signals to be safely applied while VCC = 3.3 V. Outputs swing rail-to-rail (0 V to VCC), so 3.3 V outputs require external pull-ups to 5 V for high-level recognition by 5 V receivers. No external diodes or resistors are needed for input protection.

What is the maximum capacitive load this device can drive reliably?

At VCC = 5.0 V, it reliably drives 50 pF loads with propagation delay ≤7.5 ns and output voltage deviation within VOH ≥3.70 V and VOL ≤0.55 V across –40 °C to +125 °C. For loads >50 pF, slew rate degrades and timing margins shrink; use series termination or reduce trace length to maintain signal integrity.

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

Yes - the 3-state outputs and overvoltage-tolerant inputs allow safe insertion into a live 5 V bus even when unpowered (VCC = 0 V), provided input voltages remain ≤5.5 V. However, ICC leakage may rise to 2.0 μA at VCC = 0 V, so ensure downstream logic tolerates weak pull-down states during power-up sequencing.

How does the 74AHC2G126DP,125 differ from the 74AHCT2G126DP variant?

The 74AHC version uses CMOS input thresholds (VIH ≈ 0.7×VCC), while 74AHCT uses TTL-compatible thresholds (VIH = 2.0 V fixed). This makes the AHC variant more noise-immune at 3.3 V but incompatible with true 5 V TTL outputs unless pulled up. The AHCT variant is preferred for legacy 5 V TTL system integration.