Diodes Incorporated PI74FCT541TSE

Overview

PI74FCT541TSE from Pericom Semiconductor is a fast CMOS non-inverting octal buffer/line driver with 3-state outputs, designed for high-speed bus driving in 5V TTL-compatible systems. It features dual active-low output enable inputs (OEA/OEB), 25Ω series output resistors to suppress reflections, and operates across –40°C to +85°C. Key specs include tPLH/tPHL ≤ 6.0 ns (CL = 50 pF), VOL ≤ 0.55 V at 64 mA, and ICC ≤ 500 µA quiescent current - used in memory address buffering and system clock distribution.

For engineers reviewing the PI74FCT541TSE datasheet, PI74FCT541TSE pinout, PI74FCT541TSE application, or PI74FCT541TSE equivalent, this page delivers verified functional identity, validated pin mapping, confirmed industrial temperature operation, integrated 25Ω output termination, and direct comparison against functionally aligned alternatives for bus interface design.

Technical Context

The PI74FCT541TSE implements two independent 4-bit non-inverting buffers, each controlled by separate active-low 3-state enables (OEA for outputs O0–O3; OEB for O4–O7). Its input hysteresis (200 mV) improves noise immunity on slow-rising signals, while the built-in 25Ω series resistor per output eliminates external termination in point-to-point or lightly loaded stub-bus configurations.

All inputs accept TTL-level thresholds (VIH = 2.0 V min, VIL = 0.8 V max), and outputs drive to full TTL VOH (2.4 V min at –15 mA) and VOL (0.55 V max at 64 mA), ensuring interoperability with legacy 5V logic families without level-shifting. The device uses standard CMOS process with optimized drive strength for low ground bounce and high transient immunity.

Key Specifications

Pinout & Package

PI74FCT541TSE is supplied in a Pb-free and Green 20-pin 300-mil wide plastic SOIC (Small Outline Integrated Circuit) package, with 1.27 mm pitch and standard JEDEC MS-013AC footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-inverting octal buffer applications.

Compared with SN74F541N and 74ACT541SCX, PI74FCT541TSE uniquely combines TTL input compatibility, integrated termination, input hysteresis, and sub-6 ns propagation - making it optimal for retrofitting legacy 5V buses with improved signal integrity and lower component count.

Availability

PI74FCT541TSE is available at Aetrix Electronics and suitable for memory address buffering, system bus isolation, clock distribution, and industrial I/O expansion requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for PI74FCT541TSE 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

Pericom Semiconductor was a fabless provider specializing in high-speed interface, timing, and signal-integrity solutions before its acquisition by Diodes Incorporated in 2016. Its FCT logic family targeted industrial and computing applications demanding TTL compatibility and low-noise performance.

The PI74FCT541TSE belongs to Pericom's Fast CMOS (FCT) logic product line, engineered specifically for 5V bus interface applications where signal fidelity, drive strength, and backward compatibility with TTL systems were critical design requirements.

FAQ

Is PI74FCT541TSE pin-compatible with standard 74LS541 or 74F541 devices?

Yes - PI74FCT541TSE uses the same 20-pin SOIC footprint and identical pinout as 74LS541 and 74F541, including OEA/OEB placement and D0–D7/O0–O7 ordering. This enables drop-in replacement in existing designs without PCB revision, while delivering faster speed, lower power, and integrated termination.

Can PI74FCT541TSE operate reliably at 5.5V supply?

No - the absolute maximum supply voltage is +7.0 V, but DC electrical characteristics (VOH, VOL, VIH, VIL) are only guaranteed over VCC = 5.0 V ±5%, i.e., 4.75 V to 5.25 V. Operation at 5.5 V may cause excessive ICC, timing variation, or accelerated wear; it is outside the validated operating range.

What is the purpose of the 25Ω series resistor on each output?

The 25Ω resistor is integrated into each output driver stage to match typical PCB trace impedance (≈50 Ω single-ended), thereby suppressing signal reflections caused by impedance discontinuities. This eliminates the need for external series termination resistors, saving board space and reducing BOM cost in point-to-point or daisy-chained bus topologies.

Does PI74FCT541TSE support hot-swap or live-insertion?

No - the device lacks powered-off protection (IOFF specification shows 100 µA leakage at VCC = GND, but no rail-to-rail input clamping or back-drive immunity). Applying inputs while VCC is unpowered risks latch-up or damage due to forward-biased ESD diodes; it must be powered before signal application.