KA555IDTF

Programmable Timers And Oscillators Overview

The Fairchild Semiconductor KA555IDTF is a CMOS timer integrated circuit designed for low-power applications. It operates within a supply voltage range of 2V to 18V and features a typical operating current of 0.3mA, significantly lower than bipolar counterparts. The device includes two independent comparators, an RS flip-flop, and a discharge transistor. It supports both astable and monostable configurations with output currents capable of sourcing or sinking up to 100mA. The component is housed in an 8-pin SOIC surface-mount package.

Programmable Timers And Oscillators Feature Summary

• Ultra-low power consumption with typical operating current of 0.3mA
• Wide supply voltage range from 2V to 18V
• High output drive capability: 100mA source/sink current
• CMOS technology ensures compatibility with TTL and CMOS logic families

Programmable Timers And Oscillators Applications

• Precision timing circuits and pulse generation
• DC-DC converter control loops
• Light flash and LED driver circuits
• Sequential timing events and delay generation

Programmable Timers And Oscillators Procurement Notes

Verify the manufacturer marking on the component body to confirm Fairchild origin, as the NE555/KA555 family is widely produced by multiple vendors. Ensure the suffix 'DTF' corresponds to the specific tape-and-reel packaging and temperature rating required for the assembly process. Cross-reference the datasheet revision date to ensure compliance with current RoHS directives.

Programmable Timers And Oscillators Selection Notes

Select this part when low quiescent current is critical compared to standard bipolar NE555 timers. Verify that the 2V minimum supply voltage meets the system's lowest operating condition. Confirm that the SOIC-8 footprint matches the PCB design, noting that pinouts are generally compatible with DIP-8 equivalents but physical dimensions differ.

Programmable Timers And Oscillators Part Context

The KA555 series represents the CMOS version of the industry-standard 555 timer. While functionally similar to the NE555 (bipolar) and LM555, the KA555 variant offers superior power efficiency. Fairchild Semiconductor, now part of ON Semiconductor, manufactured this component to provide a drop-in replacement for legacy designs requiring reduced power dissipation.

Programmable Timers And Oscillators Replacement Considerations

Compatible replacements include the TLC555, LMC555, and XR-555. These parts share the same functional pinout and electrical characteristics. Verify that the substitute component supports the required 100mA output current and operates within the 2V-18V supply range.