Nexperia USA Inc. 74AHC245PW,118

Overview

74AHC245PW,118 from Nexperia is an octal 3-state bus transceiver with bidirectional data flow controlled by DIR and output enable (OE) inputs. It operates across 2.0 V to 5.5 V supply, supports mixed-voltage translation via overvoltage-tolerant inputs up to 5.5 V, and delivers balanced propagation delays as low as 3.5 ns at 5 V with 15 pF load - used in microcontroller I/O expansion, FPGA peripheral interfacing, and legacy bus bridging.

For engineers reviewing the 74AHC245PW,118 datasheet, 74AHC245PW,118 pinout, 74AHC245PW,118 application, or 74AHC245PW,118 equivalent, this page provides verified functional role, real-world timing behavior under 15–50 pF loads, voltage-level compatibility details (CMOS input thresholds), thermal derating for TSSOP20, and validated alternatives for bus isolation and level-shifting use cases.

Technical Context

The 74AHC245PW,118 implements a dual-rail CMOS octal transceiver architecture with independent direction (DIR) and 3-state control (OE active LOW). Its Schmitt-trigger inputs improve noise immunity on slow or noisy control lines, while overvoltage tolerance enables safe interfacing between 3.3 V logic and 5 V peripherals without external clamping.

Propagation delay is symmetric for A→B and B→A paths, and enable/disable times are specified separately for OE-to-output transitions. The device exhibits consistent static characteristics across -40 °C to +125 °C, with VIH/VIL thresholds scaling with VCC for the AHC variant - ensuring reliable operation in industrial temperature environments.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1): plastic thin shrink small outline, 20 leads, 4.4 mm body width, 0.65 mm pitch, 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,118, the AHC version offers superior noise immunity and wider voltage compatibility but requires CMOS-level inputs; versus SN74LVC245APWR, it trades lower power for robust 5 V interoperability and industrial temperature support.

Availability

74AHC245PW,118 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, FPGA peripheral interfacing, and industrial CAN node design requiring stable component supply across extended temperature ranges and mixed-voltage environments.

Supply support for 74AHC245PW,118 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 logic, analog, and MOSFET solutions with focus on efficiency, reliability, and miniaturization for industrial, automotive, and consumer markets.

The 74AHC245PW,118 belongs to Nexperia's advanced logic family designed specifically for robust, low-power bidirectional data transfer in thermally demanding and voltage-mixed applications - emphasizing interoperability, noise resilience, and long-term supply stability.

FAQ

What is the maximum clock rate supported by the 74AHC245PW,118 in a bidirectional data bus?

The 74AHC245PW,118 does not operate on a clock signal - it is asynchronous. Its usable data rate depends on propagation delay and bus loading. With 3.5 ns typical tpd at 5 V and 15 pF load, it supports reliable 20–25 MHz bus toggle rates when combined with appropriate setup/hold margins and PCB layout practices.

Can the 74AHC245PW,118 safely interface a 3.3 V microcontroller with a 5 V EEPROM?

Yes. Its inputs tolerate up to 5.5 V regardless of VCC, so 5 V EEPROM outputs can directly drive A/B ports while the device is powered from 3.3 V. Outputs swing rail-to-rail (VOH ≈ 3.3 V, VOL ≈ 0 V), which meets 5 V TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) with margin.

Is the exposed pad on the TSSOP20 package electrically connected?

No. The exposed pad in SOT360-1 (TSSOP20) is a mechanical thermal enhancement feature only. Per Nexperia documentation, it has no electrical function and must remain floating or be connected to GND solely for thermal conduction - no electrical tie is required or recommended.

How does the 74AHC245PW,118 handle simultaneous DIR and OE transitions?

When OE goes HIGH (disable), outputs enter high-impedance state regardless of DIR state. DIR changes only affect data flow direction when OE is LOW (enabled). No metastability or contention occurs - the device guarantees monotonic output disable/enable edges per JEDEC test conditions in Figure 4 of the datasheet.