LM555H/883

Programmable Timers And Oscillators Overview

The LM555H/883 is a military-grade, hermetically sealed timer integrated circuit manufactured by Texas Instruments. It utilizes CMOS technology to provide precise timing functions in an 8-pin ceramic dual in-line package (CDIP). The device operates within a supply voltage range of 4.5 V to 16 V and supports output currents up to 200 mA. Designed for high reliability, it features a wide operating temperature range from -55°C to +125°C and meets MIL-PRF-38534 standards, making it suitable for demanding aerospace and defense applications requiring robust performance under extreme environmental conditions.

Programmable Timers And Oscillators Feature Summary

• Hermetically sealed 8-pin ceramic dual in-line package (CDIP) compliant with MIL-PRF-38534
• CMOS technology enabling low power consumption while maintaining TTL-compatible outputs
• Wide operating temperature range from -55°C to +125°C for harsh environment reliability
• Supply voltage range of 4.5 V to 16 V with 200 mA sink/source output current capability

Programmable Timers And Oscillators Applications

• Aerospace and defense timing circuits requiring radiation hardness and hermetic sealing
• Military-grade pulse generation and waveform shaping systems
• Precision timing applications in space-constrained avionics modules
• High-reliability oscillator circuits for communication equipment

Programmable Timers And Oscillators Part Context

The LM555H/883 belongs to the LM555 family of timers, specifically the military-grade variant distinguished by the 'H' suffix and '/883B' qualification. Unlike commercial counterparts such as the LM555CMX, this component is packaged in a hermetic ceramic DIP to ensure long-term stability and protection against moisture and contaminants. It serves as a direct replacement for other MIL-STD qualified 555 timers in legacy military designs where standard plastic packages are insufficient for environmental resilience.

Programmable Timers And Oscillators Replacement Considerations

When replacing the LM555H/883, verify that substitute components meet MIL-PRF-38534 Class H or K specifications for hermeticity. Ensure the alternative offers equivalent thermal resistance and pinout compatibility in an 8-pin CDIP package. Cross-reference with manufacturers like Analog Devices or Microchip for qualified military-grade alternatives if TI stock is unavailable.