Nexperia USA Inc. 74AHCT125BQ-Q100,1

Overview

74AHCT125BQ-Q100 from Nexperia is an automotive-qualified quad 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, ±8 mA output drive, and propagation delay as low as 3.0 ns (VCC = 5 V, CL = 15 pF), used for bidirectional bus interfacing in engine control units and ADAS domain controllers.

For engineers reviewing the 74AHCT125BQ-Q100 datasheet, 74AHCT125BQ-Q100 pinout, 74AHCT125BQ-Q100 application, or 74AHCT125BQ-Q100 equivalent, key selection considerations include its AEC-Q100 Grade 1 qualification (-40 °C to +125 °C), DHVQFN14 package with side-wettable flanks, 3-state enable timing (enable/disable < 9.5 ns), and input-level compatibility with legacy 5 V TTL logic in mixed-voltage automotive subsystems.

Technical Context

This device implements four independent non-inverting buffers, each with active-low 3-state output enable (nOE), enabling precise bus contention control in multiplexed data paths. Its TTL-input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V) ensure reliable interfacing with legacy microcontrollers and sensor interfaces.

All inputs feature Schmitt-trigger action for noise immunity, and the DHVQFN14 package supports automated optical inspection (AOI) via side-wettable flanks. The device meets AEC-Q100 Grade 1 requirements with latch-up immunity >100 mA and HBM ESD >2000 V.

Key Specifications

Pinout & Package

DHVQFN14 (SOT762-1) package: 2.5 mm × 3.0 mm × 0.85 mm body, no leads, 14 terminals, side-wettable flanks for AOI, thermal-enhanced construction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT125PW-Q100, the BQ variant offers superior manufacturability in high-reliability automotive lines via AOI-enabled side-wettable flanks; versus SN74AHCT125QPWRQ1, it delivers identical performance with Nexperia's optimized thermal resistance (125 K/W junction-to-case) and smaller 2.5 × 3 mm footprint.

Availability

74AHCT125BQ-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS sensor hubs, and electric power steering systems requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for 74AHCT125BQ-Q100 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 leading semiconductor manufacturer headquartered in Nijmegen, Netherlands, specializing in high-performance, high-reliability logic, analog, and discrete components for automotive, industrial, and consumer markets.

The 74AHCT series targets automotive signal integrity applications, delivering TTL-compatible logic with AEC-Q100 qualification, robust ESD protection, and thermally enhanced packaging for under-hood and safety-critical subsystems.

FAQ

What is the maximum clock frequency this device can reliably buffer?

The 74AHCT125BQ-Q100 is not a clock-specific device but a general-purpose buffer. Its propagation delay (3.0 ns typ at 5 V) supports data rates up to ~160 MHz for single-bit signals under ideal loading (CL = 15 pF). For sustained high-frequency bus operation, ensure trace impedance control and proper termination to avoid ringing-induced timing violations.

Can this device interface between 3.3 V and 5 V logic domains?

No - the 74AHCT125BQ-Q100 requires VCC = 4.5–5.5 V and has TTL input thresholds, so it cannot accept 3.3 V logic-high signals reliably (VIH min = 2.0 V, but margin is insufficient for robust 3.3 V CMOS interfacing). Use 74AHC125BQ-Q100 instead for true 3.3 V–5 V translation with CMOS input thresholds.

Is the exposed thermal pad (pin 1) required to be soldered to ground?

No - the exposed pad (terminal 1 index area) has no electrical function. Per datasheet note, it may remain unsoldered, or if soldered, must be left floating or connected to GND. It serves only mechanical and thermal purposes; grounding is optional and does not affect electrical performance.

Does this part support hot insertion into a live 5 V bus?

Yes - its overvoltage-tolerant inputs (rated to 5.5 V regardless of VCC state) and high-impedance OFF-state (IOZ ≤ ±10 μA at VCC = 0 V) allow safe connection to an energized 5 V bus. However, VCC must be powered before enabling outputs to avoid undefined behavior during power sequencing.