74ACT251PC

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74ACT251PC is an 8-input digital multiplexer with 3-STATE outputs housed in a 16-Lead Plastic Dual-In-Line Package (PDIP). It operates within a supply voltage range of 4.5V to 5.5V and supports temperatures from -40°C to +85°C. The device features TTL-compatible inputs, providing both true and complementary outputs that source or sink 24 mA. Propagation delays for select-to-output transitions are typically 7.0 ns at 5.0V.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides multifunctional capability as a universal function generator for logic functions of four variables
• Includes on-chip select logic decoding to control the single-pole, 8-position switch operation
• Features inverting and noninverting 3-STATE outputs for bus expansion compatibility

Signal Switches, Multiplexers, Decoders Applications

• Selecting one bit of data from up to eight sources
• Generating any logic function of four variables
• Multiplexer expansion by tying outputs of multiple devices together

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package variant against the datasheet ordering codes. Confirm the manufacturer origin, as Fairchild Semiconductor products are now part of onsemi. Ensure the component meets the required operating temperature range and voltage specifications for the target application environment before finalizing procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Choose this component when an 8-channel multiplexer with 3-STATE output capability is required. The ACT series ensures TTL-compatible input thresholds suitable for standard logic interfaces. Verify that the PDIP package style aligns with the board layout requirements and that the 24 mA output drive current meets the load specifications.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the 74AC/ACT family of high-speed CMOS logic components. It implements an 8-input multiplexer architecture with dedicated select lines and an active-low output enable pin. The product line includes variants in SOIC, SOP, TSSOP, and PDIP packages to accommodate different mounting and density needs.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include other 74ACT251 variants such as 74ACT251SC or 74ACT251MTC if package differences are acceptable. Cross-reference with equivalent parts from other manufacturers adhering to the same JEDEC standards for pinout and electrical characteristics.