HI1-0509-4

Overview

The HI1-0509-4 is a differential 4-channel multiplexer/demultiplexer manufactured by Harris Corporation. It utilizes monolithic CMOS technology with Dielectric Isolation (DI) to eliminate latch-up issues and reduce substrate leakage. The device integrates an array of four analog switches, a digital decoder circuit for channel selection, and an internal voltage reference for logic thresholds. It supports a wide analog signal range of ±15V and operates on a maximum power supply of 44V. Key electrical parameters include a low ON resistance of 180Ω, a transition time of 1.2µs maximum, and an access time of 250ns. The component is rated for harsh environments with a temperature range of -55°C to +125°C.

Feature Summary

• Dielectric Isolation process eliminates latch-up and minimizes parasitic capacitance
• Internal +5V reference establishes guaranteed logic thresholds for TTL/CMOS compatibility
• Break-before-make switching prevents signal shorting during channel transitions
• Integrated transient protection via series resistors and diode clamps on digital inputs

Applications

• Harsh environment data acquisition systems requiring MIL-STD-883 qualification
• Industrial automation control loops utilizing differential analog signals
• Factory automation instrumentation interfacing with CMOS or TTL logic families

Procurement Notes

Verify the specific suffix designation against official Harris documentation to confirm environmental rating and RoHS compliance status. The base part number corresponds to the JAN version of the HI-509. Ensure that ordering specifications explicitly state the required temperature range and package variant, as military-grade variants may differ from commercial equivalents. Cross-reference datasheets for pinout consistency if replacing legacy components.

Selection Notes

Select this component when differential signal integrity is critical in high-noise environments. The DI process makes it suitable where conventional junction-isolated CMOS fails due to latch-up susceptibility. Verify input signal levels do not exceed the ±15V range without external protection. Consider the 250ns access time for timing constraints in high-speed multiplexing applications requiring break-before-make functionality.

Part Context

The HI1-0509-4 belongs to the HI-506/HI-507/HI-508/HI-509 family of monolithic CMOS multiplexers. It serves as the differential 4-channel variant within this lineup, distinct from the single-channel HI-506 and HI-508 models. This family is characterized by its use of Dielectric Isolation technology, which provides superior performance in radiation and high-reliability applications compared to standard CMOS processes.

Replacement Considerations

Publicly confirmed direct replacements include DG506A/DG506AA, DG507A/DG507AA, DG508A/DG508AA, and DG509A/DG509AA. Verify functional equivalence regarding pinouts and electrical characteristics before substitution.