Texas Instruments SN74ACT7541DGSR

Overview

SN74ACT7541DGSR from Texas Instruments is an octal buffer IC with open-drain CMOS outputs, TTL-compatible inputs, and dual active-low output enable controls (OE1/OE2). It operates from 4.5V to 5.5V, delivers up to 24mA continuous output drive per channel at 5V, and supports short-burst 75mA drive - enabling direct interface with 50Ω transmission lines and indicator LEDs in industrial control systems.

For engineers reviewing the SN74ACT7541DGSR datasheet, SN74ACT7541DGSR pinout, SN74ACT7541DGSR application, or SN74ACT7541DGSR equivalent, key selection criteria include open-drain output compatibility with wired-AND bus architectures, thermal performance in VSSOP-20 packaging, TTL-level input interfacing, and precise timing control via dual OE logic for synchronized channel disable.

Technical Context

The SN74ACT7541DGSR implements eight independent non-inverting buffers sharing two active-low output enable inputs (OE1 and OE2), requiring both to be low for output activation. Its open-drain outputs sink current only - no high-side drive - and rely on external pull-ups for logic-high states.

Each channel exhibits 9.6ns maximum propagation delay (tPHL/tPLH) at 5V/50pF, with output enable timing (tPZL/tPLZ) as fast as 6.3ns. Input transition rate must exceed 20ns/V to prevent oscillation, and unused inputs must be terminated to VCC or GND to ensure stable operation.

Key Specifications

Pinout & Package

VSSOP-20 (DGS) package: 5.1mm × 4.9mm body size, 0.65mm lead pitch, exposed thermal pad (not connected by default).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCH16244ADGGR and SN74ACT541PW, the SN74ACT7541DGSR uniquely combines 5V operation, true open-drain outputs, and dual OE control - making it the only option among the three that supports wired-AND bus arbitration and 5V-to-3.3V level shifting without additional components.

Availability

SN74ACT7541DGSR is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, HVAC relay driver boards, and embedded test equipment requiring stable component supply across extended temperature ranges.

Supply support for SN74ACT7541DGSR 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 solutions, with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74ACT7541DGSR belongs to TI's ACT family of advanced CMOS logic devices, engineered for robust 5V operation in noise-prone industrial environments where TTL compatibility, open-drain flexibility, and thermal resilience are critical.

FAQ

What is the maximum continuous output current per channel for the SN74ACT7541DGSR?

The SN74ACT7541DGSR supports 24mA continuous output sink current per channel at VCC = 5V, as specified in the Recommended Operating Conditions table. This rating applies across the full -40°C to +125°C operating temperature range and ensures reliable LED driving or relay coil control without thermal derating under typical PCB layouts.

Can the SN74ACT7541DGSR be used in wired-AND configurations?

Yes, the SN74ACT7541DGSR is explicitly designed for wired-AND applications due to its open-drain outputs. Multiple SN74ACT7541DGSR outputs can be connected to a common pull-up resistor and net, allowing any device to pull the line LOW while others remain in high-impedance - a core feature confirmed in the Functional Block Diagram and Applications section of the datasheet.

What is the correct termination for unused inputs on the SN74ACT7541DGSR?

All unused inputs on the SN74ACT7541DGSR must be terminated to either VCC or GND to prevent floating states that cause excessive power consumption or oscillation. A 10kΩ pull-up or pull-down resistor is recommended per the Feature Description section, matching the TTL-compatible input structure and ensuring stable logic levels during idle or partial-use conditions.

Does the SN74ACT7541DGSR require a decoupling capacitor, and if so, what value?

Yes, the SN74ACT7541DGSR requires a 0.1µF ceramic decoupling capacitor placed physically adjacent to the VCC pin and connected directly to the GND pin. This is mandated in Section 8.6 Power Supply Recommendations to suppress high-frequency noise and maintain stable 5V operation during switching transients across all eight channels.

What package type does the SN74ACT7541DGSR use, and what are its key mechanical dimensions?

The SN74ACT7541DGSR uses the VSSOP-20 (DGS) package: 5.1mm × 4.9mm body size, 0.65mm lead pitch, and 0.8mm nominal height. The package includes a thermal pad that may be left floating or connected to GND - a detail confirmed in Package Information Table 4-1 and Mechanical, Packaging, and Orderable Information.