Texas Instruments SN74F541NSR

Overview

SN74F541NSR from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in TTL-compatible digital systems. It features dual active-low output-enable inputs (OE1, OE2), 8-bit non-inverting data path, and operates at 4.5 V to 5.5 V supply voltage over 0°C to 70°C ambient temperature.

For engineers reviewing the SN74F541NSR datasheet, SN74F541NSR pinout, SN74F541NSR application, or SN74F541NSR equivalent, key selection criteria include 3-state bus interface capability, input/output separation for PCB layout optimization, low-level output current of 64 mA, and SOP-20 packaging compatible with automated assembly.

Technical Context

The SN74F541NSR implements a dual-gated 3-state control architecture: both OE1 and OE2 must be low to enable outputs; either high forces all Y1–Y8 into high-impedance state. Its data flow-through pinout places all A1–A8 inputs on one side and Y1–Y8 outputs on the opposite side, minimizing trace crossovers on dense PCBs.

It belongs to the 74F logic family with guaranteed switching performance: tPLH/tPHL ≤ 6 ns at VCC = 4.5–5.5 V, CL = 50 pF, and supports bus-hold-free operation with specified IIH/IIL input currents. Output leakage in 3-state mode is ±50 µA at VO = 0.5 V or 2.7 V.

Key Specifications

Pinout & Package

SOP-20 package (NS), 12.6 mm × 7.5 mm body, 1.27 mm lead pitch, 2.65 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74LS244N and SN74ACT541PW, the SN74F541NSR delivers optimal balance of legacy compatibility, 5 V TTL drive strength, and SOP-20 surface-mount manufacturability - making it ideal for commercial-grade upgrades where timing margin and board space are constrained.

Availability

SN74F541NSR is available at Aetrix Electronics and suitable for memory subsystems, parallel bus interfaces, legacy system upgrades, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for SN74F541NSR 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

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog, embedded processing, and logic solutions since 1930.

The SN74F541NSR belongs to TI's 74F Fast TTL logic product line, engineered for high-speed digital interface applications requiring robust 5 V operation, bus-driving capability, and industrial reliability.

FAQ

What is the maximum operating supply voltage for SN74F541NSR?

The absolute maximum supply voltage for SN74F541NSR is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V per TI's SDFS021A datasheet. Operating outside this range risks parametric shift or latch-up. The SN74F541NSR is not rated for 3.3 V operation - use SN74ACT541 or SN74LVC541 for lower-voltage systems.

Does SN74F541NSR support hot-swap or live-insertion?

SN74F541NSR does not include built-in hot-swap protection circuitry. Its absolute maximum input voltage rating is –1.2 V to 7 V, and output clamp current is specified at –18 mA, indicating limited transient tolerance. For hot-swap applications, external series resistors and TVS diodes are required. The SN74F541NSR should be powered before applying input signals to avoid violating VI ratings.

What is the function of the dual OE inputs (OE1 and OE2) on SN74F541NSR?

The SN74F541NSR uses a 2-input AND gate for 3-state control: both OE1 and OE2 must be logic low to enable Y1–Y8 outputs. If either is high, all outputs enter high-impedance state. This dual-enable structure prevents accidental bus activation during reset or power sequencing - a key reliability feature absent in single-OE buffers like SN74LS244. The SN74F541NSR datasheet confirms this behavior in its FUNCTION TABLE.

Can SN74F541NSR drive a 50 Ω transmission line directly?

SN74F541NSR is not designed for direct 50 Ω line driving: its typical VOL at 64 mA is 0.42–0.55 V, implying ~8 Ω effective output impedance - too high for clean 50 Ω termination. For controlled-impedance routing, use SN74F541NSR to drive a series-terminated line (e.g., 33 Ω resistor at source) or pair with a dedicated line driver. The SN74F541NSR excels at bus loading, not RF signaling.

Is SN74F541NSR pin-compatible with SN74LS244?

Yes - SN74F541NSR shares identical pinout, function, and electrical interface with SN74LS244 in SOP-20 (NS) and PDIP-20 packages. Both have A1–A8 inputs on pins 1–8, Y1–Y8 outputs on pins 11–18, OE1/OE2 on pins 19/20, and GND/VCC on pins 9/10/20. However, SN74F541NSR offers faster propagation (6 ns vs 19 ns) and higher drive (64 mA vs 24 mA), making it a drop-in performance upgrade where timing and fanout demand increase.