KA555I

Programmable Timers And Oscillators Overview

The KA555I is a single timer integrated circuit manufactured by onsemi, originally produced by Fairchild Semiconductor. It operates within a supply voltage range of 4.5V to 16V and supports an industrial temperature range of -40°C to +85°C. The device provides high current drive capability up to 200mA and features adjustable duty cycle control with timing stability of 0.005%/°C. Electrical characteristics include a typical supply current of 7.5mA at 15V and a turn-off time of less than 2µs. Packaged in an 8-DIP format, it functions as a monostable or astable multivibrator for precision timing applications.

Programmable Timers And Oscillators Feature Summary

• High Current Drive Capability: Supports output sink/source currents up to 200mA.
• Temperature Stability: Maintains timing accuracy with a drift rate of 0.005%/°C.
• Wide Timing Range: Capable of generating precise time delays from microseconds to hours using external RC components.
• Fast Turn-Off Time: Internal discharge transistor turns off in less than 2 µs.

Programmable Timers And Oscillators Applications

• Precision Timing
• Pulse Generation
• Time Delay Generation
• Sequential Timing

Programmable Timers And Oscillators Procurement Notes

Verify component authenticity through authorized distributors, as the part number indicates an industrial grade variant (-40°C to +85°C). Confirm package integrity for the 8-DIP configuration. Check for RoHS compliance status relative to manufacturing date codes. Ensure replacement parts match the specific electrical tolerances and operating temperature ranges required for the target application.

Programmable Timers And Oscillators Selection Notes

Select the KA555I when an industrial temperature range (-40°C to +85°C) is required, distinguishing it from the commercial KA555 (0°C to +70°C). Choose this component if the design demands a high-current output drive of 200mA. Verify that the 8-DIP package fits the PCB layout constraints. Consider the 8-SOP variant (KA555ID) only if surface-mount technology is necessary.

Programmable Timers And Oscillators Part Context

The KA555I is the industrial-grade version of the KA555 series, originally developed by Fairchild Semiconductor before being acquired by onsemi. It belongs to the standard 555 timer family but offers enhanced temperature stability compared to commercial variants. The 'I' suffix specifically denotes the extended operating temperature range suitable for harsher environments.

Programmable Timers And Oscillators Replacement Considerations

Direct substitutes include the KA555D (SOP package) for form-factor changes, or other generic NE555/SA555 equivalents if temperature ratings allow. Verify pin compatibility and electrical parameters such as supply current and output drive capability before substitution.