Nexperia USA Inc. 74AHCT245PW,112

Overview

74AHCT245PW,112 from Nexperia is an octal 3-state bus transceiver with TTL-compatible input thresholds, direction control (DIR), and active-low output enable (OE). It operates from 4.5 V to 5.5 V, supports bidirectional data flow between A- and B-buses, and features overvoltage-tolerant inputs up to 5.5 V-enabling level translation in mixed-voltage 5 V/3.3 V system interconnects such as microcontroller-to-peripheral I/O expansion.

For engineers reviewing the 74AHCT245PW,112 datasheet, 74AHCT245PW,112 pinout, 74AHCT245PW,112 application, or 74AHCT245PW,112 equivalent, key selection criteria include its TTL-level input compatibility, 8-bit bidirectional buffering with 3-state outputs, propagation delay ≤7.7 ns (CL = 15 pF, VCC = 5 V), disable time ≤17.5 ns, and TSSOP20 package suitability for space-constrained PCB layouts.

Technical Context

The 74AHCT245PW,112 implements a dual-rail CMOS logic architecture with Schmitt-trigger inputs and TTL-level input voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 4.5–5.5 V), ensuring robust noise immunity and compatibility with legacy 5 V TTL drivers. Its DIR input selects data flow direction (A→B or B→A), while OE controls output tri-state assertion.

It delivers balanced propagation delays (tpd ≤7.7 ns) and fast enable/disable timing (ten ≤10.0 ns, tdis ≤12.5 ns at CL = 15 pF), supporting high-speed bus arbitration in industrial controllers and embedded communication interfaces. Input overvoltage tolerance (up to 5.5 V) enables safe interfacing between 5 V masters and 3.3 V peripherals without external level shifters.

Key Specifications

Pinout & Package

TSSOP20 plastic thin shrink small outline package (SOT360-1); 20 leads; body width 4.4 mm; 0.65 mm pitch; exposed thermal 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,112, the SO20 variant offers easier rework but sacrifices board density, while the TI SN74AHCT245PWR demands layout changes and adds cost unless AEC-Q100 compliance is required-making the Nexperia TSSOP20 version optimal for new high-density industrial and medical designs.

Availability

74AHCT245PW,112 is available at Aetrix Electronics and suitable for industrial automation backplanes, automotive body control modules, embedded test equipment, and medical diagnostic signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHCT245PW,112 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 reliability and energy efficiency in industrial, automotive, and consumer applications.

The 74AHCT245PW,112 belongs to Nexperia's advanced logic family designed specifically for robust bidirectional bus interfacing in mixed-voltage systems-emphasizing noise immunity, wide operating margins, and drop-in compatibility with legacy TTL infrastructure.

FAQ

What is the maximum clock frequency supported by the 74AHCT245PW,112?

The 74AHCT245PW,112 does not operate on a clock; it is an asynchronous transceiver. Its usable data rate depends on propagation delay (≤7.7 ns) and bus loading. With CL = 15 pF and VCC = 5 V, it supports clean toggling up to ~100 MHz on individual lines, assuming proper termination and layout. System-level throughput is limited by enable/disable timing and bus arbitration overhead-not a fixed clock frequency.

Can the 74AHCT245PW,112 interface a 3.3 V microcontroller with a 5 V peripheral?

Yes-its inputs tolerate up to 5.5 V regardless of VCC, allowing safe connection of 5 V peripheral outputs to the A or B ports while VCC = 3.3 V. However, outputs swing to VCC (3.3 V), so driving a 5 V peripheral input requires that the peripheral accept 3.3 V logic-high levels (e.g., TTL-compatible or 5 V tolerant inputs). For guaranteed 5 V output swings, a different device or external pull-ups are needed.

Is the thermal pad on the TSSOP20 package electrically connected?

No-the exposed thermal pad on the SOT360-1 (TSSOP20) package is not electrically connected to any internal node. Per Nexperia's datasheet, it may remain floating or be connected to GND for thermal improvement, but no electrical function is assigned. Soldering it to GND improves thermal performance by ~15 °C/W but is optional and requires no electrical tie to internal circuitry.

How does the 74AHCT245PW,112 differ from the 74AHC245PW variant?

The 74AHCT245PW uses TTL-compatible input thresholds (VIH = 2.0 V, VIL = 0.8 V), making it compatible with 5 V TTL outputs. The 74AHC245PW uses CMOS thresholds (VIH ≈ 0.7×VCC, VIL ≈ 0.3×VCC), requiring higher input voltages at lower VCC. At VCC = 5 V, both behave similarly, but the AHCT version ensures reliable recognition of marginal TTL signals (e.g., 2.4 V logic-high) where the AHC version might misread.