74F381PC

Overview

The onsemi 74F381PC is a 4-bit Arithmetic Logic Unit (ALU) housed in a 20-lead Plastic Dual-In-Line Package (PDIP). It operates within a supply voltage range of +4.5V to +5.5V and supports an ambient temperature range of 0°C to +70°C. The device performs six arithmetic and logic functions, including A Plus B, A Minus B, and A AND B, controlled by three select inputs. It features Carry Generate (G) and Carry Propagate (P) outputs for high-speed expansion using the 74F182 carry lookahead generator. Maximum propagation delays reach 21.5 ns from operand inputs to function outputs.

Feature Summary

• Performs six distinct arithmetic and logic operations on two 4-bit words
• Provides Carry Generate and Carry Propagate outputs for high-speed expansion
• Supports selectable LOW (clear) and HIGH (preset) output functions

Applications

• High-speed arithmetic expansion using carry lookahead generators
• Digital signal processing requiring parallel arithmetic operations
• Control systems utilizing 4-bit word manipulation

Procurement Notes

Verify package compatibility with existing PCB footprints, as the 74F381PC utilizes a 20-lead PDIP configuration. Confirm that the operating environment remains within the specified 0°C to +70°C temperature range. Ensure power supply stability between +4.5V and +5.5V to maintain electrical characteristics. Check for RoHS compliance documentation if required by specific project standards.

Selection Notes

Select this component when designing systems requiring dedicated 4-bit ALU functionality with high-speed carry lookahead capabilities. It is suitable for applications needing multiple arithmetic modes without external microcontroller intervention. Consider the 20-pin DIP package constraints against available board space. Evaluate the fan-out requirements against connected loads to ensure signal integrity across the circuit.

Part Context

The 74F381 belongs to the 74F series of logic integrated circuits, known for fast switching speeds. Originally manufactured by Fairchild Semiconductor, it is now part of the onsemi portfolio. This ALU complements other components like the 74F182 for expanded word lengths. It serves as a foundational building block for complex digital arithmetic units in industrial and computing hardware.

Replacement Considerations

Direct substitutes include the SN74F381N from Texas Instruments. Verify pinout compatibility and electrical specifications before integration. Alternative packages such as SOIC or SOP variants exist under different ordering codes but require physical footprint adjustments.