Nexperia USA Inc. 74AHC245D,118

Overview

74AHC245D,118 from Nexperia is an octal 3-state bus transceiver with bidirectional data flow control via DIR and output enable (OE) inputs. It operates across 2.0 V to 5.5 V supply, supports mixed-voltage translation due to overvoltage-tolerant inputs up to 5.5 V, and delivers balanced propagation delays as low as 3.5 ns (VCC = 5 V, CL = 15 pF). It is used in microcontroller I/O expansion, FPGA-to-ASIC data bridging, and legacy parallel bus interfacing.

For engineers reviewing the 74AHC245D,118 datasheet, 74AHC245D,118 pinout, 74AHC245D,118 application, or 74AHC245D,118 equivalent, key selection criteria include voltage-level translation capability, 3-state timing margins (enable/disable times ≤13.5 ns), thermal performance in SO20 package, and compatibility with CMOS logic families across industrial temperature range (–40 °C to +125 °C).

Technical Context

The 74AHC245D implements dual-bus bidirectional data transfer using a single DIR signal to determine direction (A→B or B→A) and an active-low OE to place all outputs in high-impedance state. Its Schmitt-trigger inputs improve noise immunity on slow or noisy control lines like DIR and OE.

It features overvoltage-tolerant inputs (up to 5.5 V independent of VCC), enabling safe interfacing between 3.3 V and 5 V domains without external level shifters. Static and dynamic characteristics are fully specified across –40 °C to +125 °C, with input leakage <2.0 μA and CPD = 12 pF for accurate dynamic power estimation.

Key Specifications

Pinout & Package

74AHC245D,118 uses the SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, 1.27 mm pitch, surface-mount, with gull-wing leads. Pin 1 index located at top-left corner (notch side).

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74AHCT245D,118, the 74AHC245D,118 offers superior noise immunity and broader voltage translation but requires tighter input threshold control; versus SN74LVC245APWR, it trades lower static power for robust 5 V interoperability and industrial temperature support.

Availability

74AHC245D,118 is available at Aetrix Electronics and suitable for microcontroller I/O expansion, FPGA-to-ASIC bridging, and industrial parallel bus interfacing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74AHC245D,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 reliability, efficiency, and miniaturization for industrial, automotive, and computing markets.

The 74AHC245D,118 belongs to Nexperia's advanced high-speed CMOS logic family, engineered specifically for robust bidirectional data transfer in mixed-voltage embedded systems demanding low power, wide temperature operation, and high ESD resilience.

FAQ

Can 74AHC245D,118 operate with VCC = 2.5 V while interfacing with 5 V inputs?

Yes. Its inputs are overvoltage tolerant up to 5.5 V independent of VCC, allowing safe connection to 5 V signals even at VCC = 2.5 V. Output voltage swing remains referenced to VCC (i.e., VOH ≈ 2.5 V), so external pull-ups or level restoration may be needed on the driven side if 5 V logic levels are required.

What is the maximum capacitive load the 74AHC245D,118 can drive while maintaining timing specs?

The device is characterized up to 50 pF load capacitance, with propagation delay ≤7.0 ns and enable/disable times ≤13.5 ns at VCC = 5 V. Driving >50 pF will increase tpd and ten/tdis nonlinearly; for 100 pF loads, add series termination or buffer stages to maintain setup/hold timing margins.

Is the SO20 package (SOT163-1) lead-free and RoHS-compliant?

Yes. The 74AHC245D,118 in SO20 package meets RoHS Directive 2011/65/EU and REACH SVHC requirements. Nexperia confirms lead-free terminations with matte tin plating and JEDEC-standard reflow profiles (peak 260 °C, 10 s max).

How does the Schmitt-trigger action on DIR and OE improve system reliability?

Schmitt-trigger inputs provide hysteresis (~0.5 V typical), rejecting noise spikes and slow-rising edges that could cause metastability or unintended direction changes. This prevents bus contention during power-up, reset, or EMI events-critical in industrial environments with long PCB traces or unshielded cables.