Texas Instruments CD74HC541PWR

Overview

CD74HC541PWR from Texas Instruments is a non-inverting octal buffer and line driver with three-state outputs, designed for bus interface and data routing in digital systems. It operates from 2 V to 6 V, delivers 9 ns typical propagation delay at 5 V/15 pF, drives up to 15 LSTTL loads, and supports –55℃ to 125℃ industrial/military temperature range.

For engineers reviewing the CD74HC541PWR datasheet, CD74HC541PWR pinout, CD74HC541PWR application, or CD74HC541PWR equivalent, this page provides verified functional mode behavior, TSSOP-20 package thermal metrics (RθJA = 131.8°C/W), three-state leakage (±10 μA max), and direct comparison against HC541/HCT541 variants for bus isolation and level translation use cases.

Technical Context

The CD74HC541PWR implements dual independent output-enable controls (OE1, OE2): either high forces all eight outputs into high-impedance state, while both low enables non-inverting data transfer from A0–A7 to Y0–Y7. Its CMOS input structure ensures 30% noise immunity at VCC = 5 V, and its output stage sustains ±25 mA per pin under recommended operating conditions.

It belongs to the CD74HC logic family with rail-to-rail input voltage tolerance (0 to VCC), quiescent current ≤160 μA over full temperature range, and power dissipation capacitance of 48 pF - enabling low dynamic power in high-speed bus applications where signal integrity and load driving capability are critical.

Key Specifications

Pinout & Package

TSSOP-20 package (PW), 6.50 mm × 4.40 mm body size, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NIPDAU finish, MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CD74HC541M96 and CD74HCT541PWR, the CD74HC541PWR offers the smallest PCB footprint (TSSOP), widest supply range (2–6 V), and highest temperature resilience (–55℃ to 125℃), making it optimal for space-constrained, wide-input-voltage, and extreme-environment designs.

Availability

CD74HC541PWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, and military data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HC541PWR 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, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The CD74HC541PWR belongs to TI's high-speed CMOS logic portfolio, engineered for robust bus interface, level translation, and signal conditioning in harsh-environment digital systems.

FAQ

What is the maximum clock/data rate supported by CD74HC541PWR?

The CD74HC541PWR does not operate on a clock; it is a combinational buffer. Its 9 ns typical propagation delay at 5 V/15 pF supports reliable data throughput up to ~30 MHz in synchronous bus applications. Maximum usable frequency depends on load capacitance and signal edge rates - measured tPLH/tPHL remains ≤33 ns even at 2 V and full temperature range.

Can CD74HC541PWR drive a 50 Ω transmission line directly?

No, CD74HC541PWR is not designed for 50 Ω line driving. Its output structure targets LSTTL loads (≈1 kΩ pull-up + 50 pF). For 50 Ω impedance matching, use a dedicated line driver IC or add series termination. Attempting direct 50 Ω drive risks excessive current (beyond ±25 mA absolute max) and signal integrity degradation.

Is CD74HC541PWR pin-compatible with CD74HCT541PWR?

Yes, CD74HC541PWR and CD74HCT541PWR share identical TSSOP-20 pinout, terminal functions, and mechanical dimensions. However, they differ electrically: HC operates from 2–6 V with CMOS inputs; HCT is 4.5–5.5 V only with TTL-compatible inputs. Swapping requires verifying supply and input source compatibility.

What is the purpose of having two output-enable pins (OE1 and OE2) on CD74HC541PWR?

The dual OE pins (17 and 19) provide redundant or partitioned bus control. If either OE1 or OE2 is high, all eight outputs go high-impedance. Both must be low for data pass-through. This enables fail-safe arbitration, split-bus enable logic, or redundancy in safety-critical systems where single-point OE failure must not compromise isolation.

Does CD74HC541PWR require external pull-up or pull-down resistors on unused inputs?

Yes. Unused inputs (A0–A7, OE1, OE2) must be tied to VCC or GND per TI layout guidelines. Floating CMOS inputs cause increased ICC, erratic output states, and potential device damage due to shoot-through current. For OE pins, tie to GND to ensure enabled state; for A inputs, tie to GND or VCC based on required default logic level.