Nexperia USA Inc. 74AHC245BQ-Q100X

Overview

74AHC245BQ-Q100 from Nexperia is an automotive-grade octal bus transceiver with 3-state outputs, direction control (DIR), and active-low output enable (OE). It operates across 2.0 V to 5.5 V supply, supports bidirectional data flow between A- and B-buses, features overvoltage-tolerant inputs up to 5.5 V, and is qualified to AEC-Q100 Grade 1 (−40 °C to +125 °C) for use in engine control units and ADAS domain controllers.

For engineers reviewing the 74AHC245BQ-Q100 datasheet, 74AHC245BQ-Q100 pinout, 74AHC245BQ-Q100 application, or 74AHC245BQ-Q100 equivalent, key selection considerations include its CMOS-level input compatibility, 3.5 ns typical propagation delay at 5 V/15 pF, DHVQFN20 package with side-wettable flanks for AOI, −40 °C to +125 °C operation, and 8-bit bidirectional translation capability in mixed-voltage automotive subsystems.

Technical Context

This device implements a dual-rail 8-bit bidirectional bus interface with independent DIR and OE controls. Its Schmitt-trigger inputs enhance noise immunity in noisy automotive environments, while overvoltage tolerance enables safe interfacing between 3.3 V and 5 V domains without level-shifting circuitry.

The DHVQFN20 package (SOT764-1) provides thermal enhancement and solder-joint inspectability via side-wettable flanks. The logic function strictly follows the truth table: when OE = LOW, data flows A→B if DIR = HIGH or B→A if DIR = LOW; when OE = HIGH, all outputs enter high-impedance state regardless of DIR.

Key Specifications

Pinout & Package

DHVQFN20 package (SOT764-1), 2.5 × 4.5 × 0.85 mm body, side-wettable flanks for automated optical inspection (AOI) of solder joints. Exposed thermal pad (GND(1)) is electrically isolated but may be floated or connected to system ground per layout requirements.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bus transceiver applications.

Compared with 74AHCT245BQ-Q100, the original part offers tighter VIH/VIL margins for modern low-voltage CMOS interfaces, while SN74LVC245AQPWRQ1 trades Schmitt-trigger robustness for wider supply flexibility and lower quiescent current-making each optimal for distinct automotive subsystem voltage and noise profiles.

Availability

74AHC245BQ-Q100 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and body control modules requiring stable component supply across extended automotive temperature ranges and long production lifecycles.

Supply support for 74AHC245BQ-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 global semiconductor expert focused on essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions optimized for automotive, industrial, and mobile markets.

The 74AHC-Q100 series delivers AEC-Q100-qualified, high-speed, low-power logic devices specifically engineered for automotive subsystems demanding robust mixed-voltage interoperability and extended temperature resilience.

FAQ

What is the maximum allowable input voltage on A/B pins when VCC = 3.3 V?

The device supports overvoltage-tolerant inputs up to 5.5 V regardless of VCC level. When VCC = 3.3 V, A/B pins may safely accept 5 V signals without damage or functional degradation, enabling direct connection to 5 V peripherals without external clamping or level-shifting circuitry.

Can DIR and OE be driven directly from a 3.3 V microcontroller GPIO?

Yes. For 74AHC245BQ-Q100, VIH is 2.1 V (min) at VCC = 3.0 V and 3.85 V (min) at VCC = 5.5 V. A 3.3 V MCU GPIO (VOH ≥ 3.0 V) fully satisfies VIH across the full operating range, ensuring reliable HIGH recognition on both DIR and OE pins without pull-up resistors.

Is the exposed thermal pad (GND(1)) electrically connected to internal ground?

No. Pin 10 (GND) is the functional ground terminal. The exposed pad labeled GND(1) is electrically isolated and has no internal connection. It may be left floating or connected to system ground per PCB thermal design requirements-but must not be used as a current-carrying ground path.

How does propagation delay vary between A→B and B→A directions?

Propagation delay is balanced and symmetric: tpd(A→B) = tpd(B→A) within ±0.2 ns across all voltage/load conditions. This matching is guaranteed by matched internal driver topology and verified in Table 7 of the datasheet, ensuring deterministic timing in bidirectional protocols like SPI multiplexing or shared-memory arbitration.