Nexperia USA Inc. 74VHCT125D,118

Overview

74VHCT125D,118 from Nexperia is a quad non-inverting 3-state buffer/line driver IC with TTL-compatible inputs, SO14 package, 4.5–5.5 V supply range, <7.0 ns propagation delay at 5 V/50 pF, and -40 °C to +125 °C operating temperature - used for bus isolation and signal routing in industrial control backplanes.

For engineers reviewing the 74VHCT125D,118 datasheet, 74VHCT125D,118 pinout, 74VHCT125D,118 application, or 74VHCT125D,118 equivalent, key selection criteria include TTL-level input compatibility, 3-state output timing (enable/disable), SO14 thermal performance, and guaranteed operation across extended temperature ranges without level-shifting circuitry.

Technical Context

This device implements four independent non-inverting buffers, each with active-low 3-state enable (nOE) controlling high-impedance output states. All inputs accept TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) while driving CMOS-compatible outputs (VOH ≥ 3.7 V, VOL ≤ 0.55 V at 8 mA).

Propagation delay (tpd) is specified at 4.3 ns (typ) / 9.5 ns (max) under 5 V/50 pF conditions; enable time (ten) and disable time (tdis) are 4.9 ns (typ) / 9.5 ns (max) and 6.5 ns (typ) / 11.0 ns (max), respectively - enabling precise bus arbitration in synchronous digital systems.

Key Specifications

Pinout & Package

74VHCT125D,118 uses the SO14 (SOT108-1) plastic small outline package: 14-pin, 3.9 mm body width, 1.27 mm lead pitch, gull-wing leads, JEDEC MS-012 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC125AD,118 and SN74HCT125DR, the 74VHCT125D,118 uniquely combines guaranteed TTL input compatibility, +125 °C operation, and Nexperia's industry-leading ESD robustness - making it optimal for ruggedized industrial and telecom infrastructure designs where both voltage tolerance and thermal resilience are non-negotiable.

Availability

74VHCT125D,118 is available at Aetrix Electronics and suitable for industrial control backplanes, microcontroller GPIO expansion, test equipment signal routing, and legacy system interface adapters requiring stable component supply across extended temperature and ESD-prone environments.

Supply support for 74VHCT125D,118 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 focused on essential efficiency technologies - delivering high-performance logic, analog, and MOSFET solutions optimized for reliability and energy efficiency.

The 74VHCT series targets industrial and automotive applications requiring robust, pin-compatible replacements for legacy TTL logic with enhanced speed, noise immunity, and thermal stability.

FAQ

Can 74VHCT125D,118 operate reliably at 3.3 V supply?

No - the 74VHCT125D,118 is specifically designed for TTL-level compatibility and requires 4.5–5.5 V supply per its recommended operating conditions. At 3.3 V, VIH (2.0 V) exceeds 60% of VCC, violating input threshold ratios and risking unreliable HIGH detection. Use 74LVC125AD,118 instead for 3.3 V systems.

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

The datasheet specifies dynamic characteristics up to 50 pF load capacitance. Driving >50 pF increases propagation delay nonlinearly - e.g., at 100 pF, tpd degrades by ~40% versus 50 pF. For >50 pF loads, add series termination or reduce trace length to maintain signal integrity and meet 9.5 ns max timing budget.

How does the Schmitt-trigger input improve noise immunity in real-world layouts?

Schmitt-trigger inputs provide ≥0.3 V hysteresis, meaning a rising input must exceed VIH (2.0 V) to register HIGH, and falling input must drop below VIH − 0.3 V (~1.7 V) to register LOW. This prevents oscillation on noisy 10–20 cm PCB traces carrying switch debounce or encoder signals in electrically noisy factory environments.

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

Yes - total power dissipation (Ptot) derates linearly at 10.1 mW/K above +100 °C for the SO14 package. At +125 °C, Ptot is reduced from 500 mW to 475 mW. With typical ICC < 20 μA and output loading < 4 mA per channel, self-heating remains negligible, but system-level board layout must ensure ≤25 °C rise above ambient via copper pour and airflow.