Texas Instruments SN74HC541AN

Overview

SN74HC541AN from Texas Instruments is an octal non-inverting 3-state buffer/line driver used for bus interfacing and signal isolation in digital systems. It features dual active-low output enables (OE1, OE2), CMOS-level input compatibility, ±35 mA output drive capability, and operates across 2.0 V to 6.0 V supply voltage with –40 °C to +125 °C temperature range. It is commonly deployed in microcontroller I/O expansion and memory address/data bus buffering.

For engineers reviewing the SN74HC541AN datasheet, SN74HC541AN pinout, SN74HC541AN application, or SN74HC541AN equivalent, key selection considerations include its dual enable control logic, high-impedance output state behavior, propagation delay at 2.0 V (115 ns max), input clamp diode support for overvoltage-tolerant interfacing, and DIP-20 package mechanical compatibility with legacy through-hole PCB layouts.

Technical Context

The SN74HC541AN implements eight identical non-inverting buffer circuits, each with independent input-to-output signal path and shared 3-state output control via two active-low enable inputs. Its CMOS input structure provides high noise immunity and low static current draw, while output stages are designed for rail-to-rail swing and bidirectional current sourcing/sinking up to ±35 mA per pin.

Input clamp diodes allow safe interface to signals exceeding VCC when used with external current-limiting resistors. The device complies with JEDEC Standard No. 7A and supports operation from –40 °C to +125 °C, making it suitable for industrial and extended-temperature embedded applications where bus loading and signal integrity must be actively managed.

Key Specifications

Pinout & Package

SN74HC541AN uses a 20-pin plastic dual in-line package (PDIP-20), 6.35 mm wide, with 2.54 mm lead pitch and standard through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows counter-clockwise sequence from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC541AN, SN74HCT541N offers improved input compatibility with legacy TTL sources but sacrifices some noise margin at low VCC, while 74HC541D delivers identical functionality in a smaller, surface-mount form factor-neither is pin-compatible with the DIP-20 SN74HC541AN due to differing package footprints and soldering requirements.

Availability

SN74HC541AN is available at Aetrix Electronics and suitable for industrial control panels, retro-computing restoration projects, and sensor interface modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for SN74HC541AN 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 leader specializing in analog, embedded processing, and logic ICs, with decades of heritage in industry-standard 74-series logic families.

The SN74HC541AN belongs to TI's HC (High-Speed CMOS) logic family, designed for low-power, high-noise-immunity digital interfacing in industrial, computing, and communications equipment where reliability and broad supply voltage tolerance are essential.

FAQ

What is the maximum operating supply voltage for SN74HC541AN?

The SN74HC541AN supports a maximum supply voltage of +6.0 V, as specified in its Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term performance, the recommended operating range is 2.0 V to 6.0 V, with typical use at 5.0 V in legacy 5 V systems and 3.3 V in mixed-signal applications. The SN74HC541AN maintains full functionality-including propagation delay and output drive-across this entire range.

Does SN74HC541AN support 3.3 V logic inputs when powered from 5 V?

Yes, SN74HC541AN supports 3.3 V logic inputs when VCC = 5 V. Its CMOS input structure guarantees VIH(min) = 3.15 V at VCC = 4.5 V and 3.5 V at VCC = 5.0 V, providing sufficient margin for standard 3.3 V CMOS outputs (typically 3.0–3.6 V HIGH). This makes the SN74HC541AN ideal for level-shifting between 3.3 V controllers and 5 V peripherals without external translators.

How do the two output enables (OE1 and OE2) function in SN74HC541AN?

In SN74HC541AN, both OE1 (pin 1) and OE2 (pin 19) are active-low enables. If either is HIGH, all eight outputs (Y0–Y7) enter high-impedance (Z) state regardless of input states. Only when both OE1 and OE2 are LOW do outputs reflect their respective inputs (A0–A7). This dual-enable architecture allows flexible bus arbitration-e.g., OE1 controlled by system master, OE2 by local peripheral-without requiring external logic.

Can SN74HC541AN drive a 50 pF load at 2.0 V supply?

Yes, SN74HC541AN is characterized for CL = 50 pF in its dynamic specifications. At VCC = 2.0 V, it delivers tpd ≤ 115 ns and tt ≤ 90 ns into 50 pF, confirming reliable operation under typical board-level capacitive loading. Output drive remains within ±35 mA limits, and VOL stays ≤ 0.1 V at 20 µA sink current-ensuring clean logic transitions even at minimum supply voltage.

Is SN74HC541AN suitable for automotive under-hood applications?

No, SN74HC541AN is not automotive-qualified. While it operates from –40 °C to +125 °C-a range overlapping some automotive ambient conditions-it lacks AEC-Q100 qualification, automotive-grade screening, and guaranteed PPAP documentation. For under-hood use, TI recommends AEC-Q100 qualified alternatives such as the SN74HCS541QPWRQ1. The SN74HC541AN is intended for industrial, computing, and general-purpose embedded applications.