Nexperia USA Inc. 74VHC125BQ,115

Overview

74VHC125BQ,115 from Nexperia is a quad non-inverting 3-state buffer/line driver in DHVQFN14 package, operating from 2.0 V to 5.5 V with CMOS logic-level compatibility, propagation delay as low as 3.0 ns (VCC = 4.5–5.5 V, CL = 15 pF), and specified for -40 °C to +125 °C industrial temperature range. It enables bidirectional bus isolation in digital interface circuits such as microcontroller peripheral expansion and memory address/data buffering.

For engineers reviewing the 74VHC125BQ,115 datasheet, 74VHC125BQ,115 pinout, 74VHC125BQ,115 application, or 74VHC125BQ,115 equivalent, key selection criteria include 3-state output timing (enable/disable times ≤ 9.5 ns), input tolerance beyond VCC, Schmitt-trigger inputs for noise immunity, and thermal-enhanced QFN packaging for high-density PCB layouts.

Technical Context

This device implements four independent buffer channels, each with active-low 3-state enable (nOE) controlling high-impedance output states. All inputs feature Schmitt-trigger action for robust signal conditioning, and accept voltages up to 7.0 V regardless of VCC level - enabling mixed-voltage interfacing.

It complies with JEDEC JESD7-A and supports both CMOS (74VHC125) and TTL-compatible (74VHCT125) logic families. The DHVQFN14 package (SOT762-1) provides 14 terminals in a 2.5 × 3 × 0.85 mm footprint with exposed thermal pad, supporting power dissipation up to 500 mW at ambient ≤ 98 °C before derating.

Key Specifications

Pinout & Package

DHVQFN14 package (SOT762-1): 2.5 × 3 × 0.85 mm body, no leads, 14 terminals, exposed thermal pad (pin 7 is GND; pin 14 is VCC). Thermal pad must be soldered to PCB ground plane for rated power dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74VHC125BQ,115, the 74LVC125ABQ,115 offers lower voltage operation but reduced noise margin at 2.0 V, while SN74LVCH125ARGYR delivers stronger drive at the cost of higher quiescent current and stricter layout constraints.

Availability

74VHC125BQ,115 is available at Aetrix Electronics and suitable for microcontroller bus expansion, memory address buffering, industrial sensor interface hubs, and legacy system protocol translation requiring stable component supply across extended temperature ranges.

Supply support for 74VHC125BQ,115 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 discrete, logic, and MOSFET solutions with focus on efficiency, reliability, and miniaturization.

The 74VHC/VHCT logic family targets high-speed, low-power digital interface applications in industrial, computing, and communications systems where pin compatibility with legacy TTL and robust noise immunity are essential.

FAQ

Can 74VHC125BQ,115 operate with VCC = 2.0 V while accepting 5 V inputs?

Yes. Per Table 4 (Limiting Values), input voltage range is -0.5 V to +7.0 V regardless of VCC. At VCC = 2.0 V, inputs tolerate up to 5 V without damage or latch-up, enabling safe interfacing with higher-voltage peripherals without external clamping diodes or level shifters.

What is the recommended PCB layout for thermal management of the DHVQFN14 package?

The exposed thermal pad (connected to pin 7/GND) must be soldered to a minimum 100 mm² copper pour tied to internal/external GND planes via ≥4 thermal vias (0.3 mm diameter). This achieves junction-to-board thermal resistance of ≤45 °C/W, enabling full 500 mW power dissipation at 98 °C ambient before derating begins.

How does the Schmitt-trigger input improve noise immunity compared to standard CMOS inputs?

Schmitt-trigger inputs provide hysteresis (~0.3 V at VCC = 5 V), meaning the threshold for rising-edge detection (VIH ≈ 3.85 V) differs from falling-edge detection (VIL ≈ 1.65 V). This prevents multiple toggles on slow or noisy edges - critical for reliable operation on long cables or near switching power supplies where signal rise/fall times exceed 20 ns/V.

Is 74VHC125BQ,115 pin-compatible with 74VHCT125BQ,115?

Yes - both share identical DHVQFN14 pinout (SOT762-1), same terminal numbering, and identical functional diagram. The only difference is input threshold logic: 74VHC125 uses CMOS-compatible VIH/VIL (e.g., VIH = 3.85 V @ VCC = 5.5 V), while 74VHCT125 uses TTL-compatible thresholds (VIH = 2.0 V min). Electrical substitution is possible only if source drivers meet the target device's input voltage requirements.