Nexperia USA Inc. 74AHCT2G126DC,125

Overview

74AHCT2G126DC,125 from Nexperia is a dual 3-state buffer/line driver with TTL-compatible inputs, operating from 4.5 V to 5.5 V supply, featuring overvoltage-tolerant inputs up to 5.5 V and specified for -40 °C to +125 °C industrial temperature range. It enables bidirectional signal isolation in mixed-voltage bus interfaces and supports high-speed data routing in microcontroller peripheral expansion.

For engineers reviewing the 74AHCT2G126DC,125 datasheet, 74AHCT2G126DC,125 pinout, 74AHCT2G126DC,125 application, or 74AHCT2G126DC,125 equivalent, key selection criteria include TTL-level input compatibility, 3-state enable timing (t_en ≤ 9.5 ns at V_CC = 5 V), output drive capability (±8 mA), propagation delay (t_pd ≤ 7.0 ns), and VSSOP8 package footprint constraints.

Technical Context

This device implements two independent non-inverting buffers, each with active-HIGH 3-state output enable (1OE, 2OE) controlling output impedance. Input logic thresholds are fixed at TTL levels (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V), ensuring direct compatibility with legacy 5 V TTL outputs without level-shifting circuitry.

Each buffer exhibits symmetrical output impedance and balanced propagation delays (t_PLH ≈ t_PHL). The overvoltage-tolerant inputs (up to 5.5 V) allow safe interfacing with higher-voltage signals while powered from a 5 V rail, supporting robust signal translation in heterogeneous voltage domains.

Key Specifications

Pinout & Package

VSSOP8 plastic very thin shrink small outline package (SOT765-1); 8 leads; body width 2.3 mm; lead pitch 0.5 mm; pin 1 indicator located on lower-left corner below marking code 'C26'.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHC2G126DC,125 and SN74LVC2G126DCUR, the 74AHCT2G126DC,125 uniquely bridges legacy 5 V TTL and modern 5 V CMOS systems without external components, offering guaranteed 5 V input compatibility and industrial temperature support not found in LVC variants.

Availability

74AHCT2G126DC,125 is available at Aetrix Electronics and suitable for industrial automation controllers, automotive body electronics, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT2G126DC,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, reliable logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.

The 74AHCT series targets industrial and automotive applications requiring TTL-compatible logic with enhanced ESD robustness, wide temperature operation, and low-power CMOS architecture.

FAQ

What is the maximum clock frequency supported by 74AHCT2G126DC,125 in a data bus application?

The device does not operate as a clocked element but supports data rates up to ~100 MHz in short traces (≤5 cm) with 15 pF load, based on its 7.0 ns max propagation delay and 9.5 ns enable time. Actual usable frequency depends on PCB layout, termination, and fanout - verified up to 80 MHz in 5 V LVTTL bus implementations per Nexperia application note AN10792.

Can 74AHCT2G126DC,125 be used with a 3.3 V supply?

No - the 74AHCT variant is specified only for 4.5 V to 5.5 V operation. At 3.3 V, input thresholds (VIH ≥ 2.0 V) may not be reliably met, and output drive (VOH/VOL) falls outside specification. For 3.3 V systems, use 74AHC2G126DC,125 or SN74LVC2G126DCUR instead.

How does the overvoltage-tolerant input feature protect the device during hot-plug events?

Inputs tolerate up to 5.5 V regardless of V_CC state, allowing safe connection to live 5 V buses before power-up. Internal clamp structures limit input current to <20 mA even if V_CC = 0 V, preventing latch-up per JESD78 Class II Level A and enabling robust field-replaceable module designs.

Is thermal derating required for continuous operation at +125 °C ambient?

Yes - total power dissipation derates linearly at 4.9 mW/K above +99 °C for the VSSOP8 package. At +125 °C ambient, maximum allowed P_tot drops to ~125 mW (250 mW − 4.9 mW/K × 26 K). This permits full-speed operation with ≤2 buffers active and moderate capacitive loading.