Nexperia USA Inc. 74AHC245PW-Q100J

Overview

74AHC245PW-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 engine control and body electronics applications.

For engineers reviewing the 74AHC245PW-Q100 datasheet, 74AHC245PW-Q100 pinout, 74AHC245PW-Q100 application, or 74AHC245PW-Q100 equivalent, key selection considerations include voltage translation capability in mixed-supply systems, propagation delay ≤7.0 ns at 5 V/50 pF, 3-state timing (enable/disable), Schmitt-trigger inputs for noise immunity, and TSSOP20 package compatibility with automated optical inspection.

Technical Context

This device implements a dual-rail bidirectional bus interface using CMOS logic with TTL-compatible input thresholds on the AHCT variant and pure CMOS thresholds on the AHC variant. Its DIR pin selects data flow direction (A→B or B→A), while OE independently places all outputs in high-impedance state-enabling shared bus arbitration without contention.

The transceiver integrates Schmitt-trigger inputs for robust noise rejection, overvoltage-tolerant I/O enabling safe interfacing between 3.3 V and 5 V domains, and latch-up immunity exceeding 100 mA per JESD78 Class II Level A. It delivers balanced tPLH/tPHL propagation delays and supports dynamic operation up to 100 MHz under typical load conditions.

Key Specifications

Pinout & Package

TSSOP20 plastic thin shrink small outline package (SOT360-1); 20 leads; body width 4.4 mm; lead pitch 0.65 mm; exposed pad not electrically connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT245PW-Q100, this AHC variant offers superior noise margin in 3.3 V systems due to higher VIH; versus SN74LVC245APWR, it provides guaranteed operation at 5 V and full AEC-Q100 compliance - critical for functional safety validation.

Availability

74AHC245PW-Q100 is available at Aetrix Electronics and suitable for engine control units, body control modules, and infotainment head units requiring stable component supply across extended temperature ranges and automotive lifecycle commitments.

Supply support for 74AHC245PW-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 high-volume, high-reliability logic, discrete, and MOSFET solutions, serving automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

This device belongs to Nexperia's automotive-qualified AHC logic family, engineered specifically for robust bidirectional data exchange in harsh-temperature vehicle networks where voltage translation and bus arbitration are essential.

FAQ

What is the maximum clock frequency supported by 74AHC245PW-Q100?

The device does not operate on a clock signal-it is asynchronous. Its usable data rate depends on propagation delay and load capacitance: at 5 V and 50 pF, tpd ≤7.0 ns supports reliable toggling up to ~70 MHz for burst transfers. System-level timing must account for worst-case enable/disable delays (ten ≤13.5 ns, tdis ≤12.5 ns) in bus arbitration protocols.

Can 74AHC245PW-Q100 interface a 3.3 V MCU with a 5 V EEPROM?

Yes. With VCC = 3.3 V, its overvoltage-tolerant inputs accept 5 V signals safely, and its outputs swing to ≥2.9 V (VOH, IO = −4 mA), which exceeds the 2.0 V VIH threshold of standard 5 V EEPROMs. OE and DIR must be driven from the 3.3 V domain using compatible logic levels.

Is the exposed thermal pad on the TSSOP20 package electrically connected?

No. The exposed pad in SOT360-1 is a mechanical thermal enhancement feature only, with no electrical connection. It may be left floating or soldered to a thermal plane for improved heat dissipation, but must not be tied to VCC or GND unless explicitly confirmed in the latest Nexperia package drawing revision.

How does the Schmitt-trigger input improve noise immunity in automotive environments?

Schmitt-trigger inputs provide ≥0.8 V hysteresis between rising and falling thresholds, rejecting fast transients (<10 ns) induced by ignition noise or relay switching. This prevents false logic transitions on long harness-connected lines, eliminating software debouncing requirements and reducing MCU interrupt load in body electronics modules.