Texas Instruments CD74HCT541M

Overview

CD74HCT541M from Texas Instruments is a noninverting octal buffer and line driver with three-state outputs, designed for bidirectional bus interfacing in industrial control and data acquisition systems. It operates at 4.5–5.5 V, delivers 15 LSTTL load drive capability, exhibits 11 ns typical propagation delay (VCC = 5 V, CL = 15 pF), and supports –55°C to +125°C ambient operation.

For engineers reviewing the CD74HCT541M datasheet, CD74HCT541M pinout, CD74HCT541M application, or CD74HCT541M equivalent, this page provides verified functional modes, thermal metrics, truth table behavior, output enable timing, and SOIC-20 package-specific layout guidance - all critical for bus isolation, level translation, and high-reliability digital interface design.

Technical Context

The CD74HCT541M implements dual independent output-enable controls (OE1 and OE2) that place all eight outputs into high-impedance state when either is HIGH; both must be LOW for active data transmission. Its CMOS input structure ensures LSTTL-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) while maintaining low input leakage (≤1 μA) and rail-to-rail output swing under TTL loads.

It features balanced tPLH/tPHL propagation delays (11 ns typ), fast three-state enable/disable times (14 ns typ), and tightly controlled transition times (11 ns typ), enabling clean signal integrity on shared buses. The device's 48 pF power dissipation capacitance (CPD) and 160 μA max ICC support low dynamic power consumption in high-speed digital systems.

Key Specifications

Pinout & Package

CD74HCT541M is supplied in a 20-pin SOIC (DW) package with nominal body dimensions of 12.80 mm × 7.50 mm and 1.27 mm lead pitch. The package is RoHS-compliant, moisture-sensitive level 1 (260°C peak reflow), and marked "HCT541M".

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74HCT244N and 74ACT541PC, CD74HCT541M uniquely supports dual-output-enable arbitration for segmented bus control, maintains full military temperature qualification, and offers optimal balance of speed, drive strength, and low static power in ruggedized 5 V designs.

Availability

CD74HCT541M is available at Aetrix Electronics and suitable for industrial automation, automotive diagnostics, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CD74HCT541M 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 CD74HCT541M belongs to TI's HCT logic family, engineered for direct LSTTL input compatibility and robust operation in high-noise, wide-temperature industrial environments - specifically targeting bus interface, data routing, and system-level isolation.

FAQ

What is the maximum operating temperature for CD74HCT541M?

The CD74HCT541M is rated for continuous operation from –55°C to +125°C ambient temperature. This specification is validated per TI's military-grade qualification testing and applies to the SOIC-20 (DW) package variant. Thermal derating is not required within this range, and the device maintains full electrical performance including propagation delay, output drive, and input thresholds across the entire span.

Does CD74HCT541M require external pull-up or pull-down resistors on its OE pins?

No, CD74HCT541M does not require external pull-up or pull-down resistors on OE1 or OE2. These pins have CMOS input structure with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 5 V. When driven directly by MCU GPIOs or logic gates, they function reliably. However, unused OE pins must be tied to VCC or GND - floating enables cause undefined output states and potential bus contention.

Can CD74HCT541M drive a 50 pF load with guaranteed timing?

Yes, CD74HCT541M guarantees timing performance with 50 pF loads: tPLH/tPHL = 28 ns max (–55°C to +125°C, VCC = 4.5 V), and tPLZ/tPHZ = 42 ns max for enable/disable transitions. These values are specified in Section 5.5 of the official TI datasheet (SCHS189E) and include worst-case process, voltage, and temperature corners - no derating needed for 50 pF capacitive loading in compliant PCB layouts.

What is the pin 1 marking orientation for CD74HCT541M in SOIC packaging?

CD74HCT541M in SOIC-20 (DW) package follows JEDEC MO-153 standard: pin 1 is located at the top-left corner when the part marking "HCT541M" is read left-to-right with the notch or index mark oriented upward. Tape-and-reel packaging places pin 1 in quadrant Q1 per TI's carrier tape specification (A0 = 10.8 mm, B0 = 13.3 mm).

How does CD74HCT541M differ from CD74HC541M in practical design use?

CD74HCT541M differs from CD74HC541M primarily in input threshold compatibility: CD74HCT541M accepts standard TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), while CD74HC541M requires CMOS thresholds (VIH ≥ 3.15 V at VCC = 4.5 V). In 5 V systems with legacy TTL outputs, CD74HCT541M eliminates level-shifting; CD74HC541M may misread logic states without interface conditioning. Both share identical pinout, drive strength, and timing.