Texas Instruments CD74HC541EE4

Overview

CD74HC541EE4 from Texas Instruments is a non-inverting octal buffer and line driver with three-state outputs, designed for bidirectional bus interfacing in industrial control and data acquisition systems. It operates from 2 V to 6 V, delivers 15 LSTTL load drive capability, exhibits 9 ns typical propagation delay at 5 V/15 pF, and supports –55℃ to 125℃ ambient operation.

For engineers reviewing the CD74HC541EE4 datasheet, CD74HC541EE4 pinout, CD74HC541EE4 application, or CD74HC541EE4 equivalent, key selection criteria include its non-inverting logic function, dual output-enable control (OE1/OE2), wide supply voltage range, high noise immunity (30% of VCC), and compatibility with legacy TTL and modern CMOS buses.

Technical Context

The CD74HC541EE4 implements eight independent non-inverting buffer channels, each with separate input and output terminals, controlled collectively by two active-low output-enable inputs (OE1 and OE2). Both enables must be LOW for valid data transmission; either HIGH forces all outputs into high-impedance state.

Its HC logic family ensures CMOS-level power efficiency and rail-to-rail output swing while maintaining full compatibility with TTL input thresholds when operated at 4.5–5.5 V. Propagation delay and transition times are balanced across temperature extremes, supporting reliable timing in mixed-signal embedded systems.

Key Specifications

Pinout & Package

CD74HC541EE4 uses a 20-pin plastic dual in-line package (PDIP-N) with 25.40 mm × 6.35 mm body size and 2.54 mm lead pitch. Pin 1 is located at the left end of the top row, identified by a notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HC244N and CD74HCT541E, CD74HC541EE4 offers unified 8-bit enable control and optimal noise immunity for CMOS-native designs, making it ideal for centralized bus drivers where consistent timing and simplified logic control are prioritized.

Availability

CD74HC541EE4 is available at Aetrix Electronics and suitable for industrial automation, test equipment, and automotive electronics requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC541EE4 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The CD74HC541EE4 belongs to TI's legacy HC logic family, engineered for high-speed, low-power, and wide-temperature operation in mission-critical digital interfacing applications.

FAQ

What is the logic function of CD74HC541EE4?

CD74HC541EE4 is a non-inverting octal buffer with three-state outputs. Each of its eight channels passes input A0–A7 to corresponding outputs Y0–Y7 without inversion. Its dual output-enable inputs (OE1 and OE2) must both be LOW for data transmission; either HIGH places all outputs in high-impedance state. This behavior is confirmed in the device truth table and functional description in TI's SCHS189E datasheet.

What package type does CD74HC541EE4 use?

CD74HC541EE4 uses a 20-pin plastic dual in-line package (PDIP-N) with dimensions 25.40 mm × 6.35 mm and 2.54 mm lead pitch. This is explicitly documented in TI's package information table and orderable addendum, where CD74HC541EE4 is listed under "PDIP (N) | 20" with tube packaging and RoHS-compliant NIPDAU lead finish.

Can CD74HC541EE4 operate at 3.3 V supply?

Yes, CD74HC541EE4 supports 2 V to 6 V supply operation, fully including 3.3 V. At 3.3 V, it maintains guaranteed logic thresholds (VIH ≥ 2.31 V, VIL ≤ 1.1 V), rail-to-rail output swing, and specified propagation delay (≤28 ns typical at CL = 15 pF). This is validated in the HC-type Recommended Operating Conditions and Electrical Characteristics tables of the datasheet.

How does the dual output-enable feature work on CD74HC541EE4?

The CD74HC541EE4 uses two active-low output-enable inputs (OE1 and OE2) that operate in OR logic: if either OE1 or OE2 is HIGH, all eight outputs enter high-impedance state. Only when both are LOW do outputs reflect their respective inputs. This architecture enables flexible bus arbitration-e.g., one enable tied to system reset, the other to software-controlled bus grant-without external logic.

Is CD74HC541EE4 pin-compatible with CD74HCT541E?

Yes, CD74HC541EE4 and CD74HCT541E share identical 20-pin PDIP (N) packaging, pinout, and functional block diagram. The only differences are input threshold specifications: CD74HC541EE4 uses CMOS-compatible VIH/VIL (30% of VCC), while CD74HCT541E uses TTL-compatible thresholds (VIH = 2 V min, VIL = 0.8 V max). No PCB changes are required for substitution in 5 V systems where input source types match.