Texas Instruments SN74HC541PW

Overview

SN74HC541PW from Texas Instruments is an octal non-inverting buffer/line driver with 3-state outputs, designed for bus interface and signal isolation in digital systems. It operates from 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 10 ns (VCC = 6 V, CL = 50 pF), and supports high-current bus driving up to 15 LSTTL loads - commonly used in PC motherboard I/O expansion and industrial control backplanes.

For engineers reviewing the SN74HC541PW datasheet, SN74HC541PW pinout, SN74HC541PW application, or SN74HC541PW equivalent, key selection considerations include its dual active-low output-enable architecture (OE1/OE2), TSSOP-20 package footprint, 3-state timing parameters (ten/tdis), wide supply range compatibility, and input current limitation (≤1 µA max) for low-power system design.

Technical Context

The SN74HC541PW implements eight independent non-inverting buffers, each with true logic polarity and controlled 3-state output via a two-input NOR gate (OE1 and OE2). Both enables must be low to activate outputs; either high forces all Y1–Y8 into high-impedance mode. Its data flow-through pinout places all eight A inputs on one side and Y outputs on the opposite side, simplifying PCB routing and reducing crosstalk.

This device belongs to the 74HC logic family and uses silicon-gate CMOS technology, delivering rail-to-rail output swing, low static current (80 µA max ICC), and ESD robustness (±2000 V HBM). It is specified for operation from –40°C to +85°C and supports load capacitances up to 150 pF with verified switching performance across VCC = 2–6 V.

Key Specifications

Pinout & Package

TSSOP-20 package (6.50 mm × 4.40 mm body size), thin shrink small-outline package with gull-wing leads, optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC541PW, SN74HCT541PW offers superior TTL-input compatibility without layout change, while 74LVC541APW trades 5 V tolerance and robustness for speed and lower voltage operation - making SN74HC541PW the optimal choice for general-purpose 2–6 V bus isolation where interoperability and reliability are prioritized over peak frequency.

Availability

SN74HC541PW is available at Aetrix Electronics and suitable for PC motherboard I/O expansion, industrial PLC backplane interface, and medical sensor hub applications requiring stable component supply and long-term production continuity.

Supply support for SN74HC541PW 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 specializing in analog and embedded processing technologies, with leadership in logic, power management, and signal chain solutions.

The SN74HC541PW belongs to TI's 74HC high-speed CMOS logic family, engineered for robust bus interfacing, signal conditioning, and level translation in industrial, computing, and communications equipment.

FAQ

What is the operating temperature range for the SN74HC541PW?

The SN74HC541PW is rated for industrial operation from –40°C to +85°C. This range is validated per JEDEC JESD78 and applies to all electrical specifications in the datasheet, including propagation delay, output drive, and quiescent current. The TSSOP-20 package's thermal resistance (RθJA = 131.8°C/W) supports this rating under standard PCB copper pour conditions.

Does the SN74HC541PW support 5 V operation?

Yes, the SN74HC541PW fully supports 5 V operation across all parameters: it delivers ±6 mA output drive, maintains VIH/VIL thresholds compatible with TTL logic (VIH = 3.15 V min at VCC = 4.5 V), and achieves 10 ns typical propagation delay at VCC = 6 V. Its 2–6 V supply range makes it ideal for legacy 5 V systems and mixed-voltage designs.

How are the output-enable pins OE1 and OE2 configured in the SN74HC541PW?

In the SN74HC541PW, OE1 (pin 1) and OE2 (pin 19) form a two-input NOR gate controlling all eight outputs. Both must be logic low to enable Y1–Y8; if either is high, all outputs enter high-impedance state. This architecture allows flexible bus arbitration - for example, OE1 can be tied to a system reset line while OE2 connects to a peripheral select signal.

Can the SN74HC541PW drive LEDs directly?

Yes, the SN74HC541PW can drive LEDs directly: each Y output sources or sinks up to ±6 mA at 5 V, sufficient for indicator LEDs (typically 2–5 mA). For common-anode configurations, connect LED cathode to Y and anode to VCC via current-limiting resistor; for common-cathode, connect LED anode to Y and cathode to GND. Ensure total package current remains within ±70 mA limit.

Is the SN74HC541PW pin-compatible with other packages in the SN74HC541 family?

Yes, the SN74HC541PW shares identical pin numbering and function mapping with all SN74HC541 variants (e.g., SN74HC541DB, SN74HC541DW, SN74HC541N). All use 20-pin configurations with identical A1–A8, Y1–Y8, OE1, OE2, VCC, and GND assignments. Only physical dimensions and thermal characteristics differ - enabling drop-in replacement across SOIC, SSOP, PDIP, and TSSOP footprints.