74AC139SJ

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74AC139SJ is a dual 2-line to 4-line decoder/demultiplexer from the AC series, housed in a 16-lead Small Outline Package (EIAJ Type II). It operates on a single power supply ranging from 2V to 6V and supports an operating temperature range of -40°C to 85°C. The device features two completely independent decoders with active-low mutually exclusive outputs capable of sourcing and sinking 24mA. Inputs are TTL-compatible, and the circuit includes two enable inputs to simplify cascading.

Signal Switches, Multiplexers, Decoders Feature Summary

• Dual independent 1-of-4 decoding capability within a single package
• Active-low mutually exclusive outputs for precise signal routing
• TTL-compatible inputs ensuring broad interface compatibility
• High drive strength allowing direct output sourcing and sinking

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory decoding systems
• Data-routing applications requiring short propagation delays
• Cascaded logic circuits utilizing enable inputs

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific suffix SJ against the manufacturer datasheet to confirm the EIAJ Type II SOIC package dimensions and marking specifications. Ensure the component meets RoHS requirements if applicable to the target assembly process. Cross-reference the ordering code with official onsemi documentation to validate availability and current production status before finalizing procurement plans.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when dual independent decoding is required alongside high-speed performance characteristics. The AC series offers faster switching speeds compared to standard HC or HCT variants while maintaining CMOS low power consumption. Verify that the 2V to 6V supply voltage range aligns with the system design constraints and that the 16-pin SOIC footprint fits the PCB layout requirements.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74AC logic family, known for high-speed operation and wide voltage tolerance. It serves as a functional equivalent to other manufacturers' 74AC139 devices, such as those from Fairchild or National Semiconductor, provided pinouts and electrical characteristics match. The device is widely used in digital systems requiring efficient address decoding or data distribution.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include the 74AC139SCX and 74AC139MTC from onsemi, which offer identical logical functions but differ in package type. Other manufacturers may provide equivalents like the SN74AC139 or MC74AC139, though package variations must be verified.