MC1455BD

Programmable Timers And Oscillators Overview

The MC1455BD is a monolithic timing circuit manufactured by onsemi, designed as a direct replacement for NE555 timers. It operates within a supply voltage range of 4.5 V to 16 V and supports both astable and monostable modes. The device features a high-current output capable of sourcing or sinking up to 200 mA, allowing it to drive TTL circuits directly. It offers timing stability of 0.005% per °C and includes dedicated terminals for triggering and resetting. The component is housed in an SOIC-8 package and functions across an ambient temperature range of -40°C to +85°C.

Programmable Timers And Oscillators Feature Summary

• Direct replacement for NE555 timers with adjustable duty cycle
• High current output structure sources or sinks 200 mA
• Operates in astable and monostable modes with timing from microseconds to hours
• Temperature stability of 0.005% per °C

Programmable Timers And Oscillators Applications

• Solid state time delay relay circuits
• Linear voltage ramp generation using constant current sources
• Missing pulse detection systems
• Pulse width modulation applications

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix 'D' corresponds to the SOIC-8 package and the '-40°C to +85°C' operating temperature range. Confirm RoHS compliance status if required, noting that Pb-free variants typically carry a 'G' suffix (e.g., MC1455BDR2G). Ensure the ordering quantity matches the shipping unit of 98 units per rail for this specific package configuration.

Programmable Timers And Oscillators Selection Notes

Select the MC1455BD when a standard 555-timer function is needed with industrial temperature ratings (-40°C to +85°C). Choose this part over the MC1455 (0°C to +70°C) for wider thermal environments. Consider the NCV prefix for automotive applications requiring specific site change controls. Ensure external resistor values limit Pin 7 discharge current below the 200 mA maximum rating.

Programmable Timers And Oscillators Part Context

The MC1455BD belongs to the MC1455 family of monolithic timing circuits produced by onsemi. This family includes variants such as the MC1455 (commercial grade), MC1455B (industrial grade), and NCV1455B (automotive grade). The 'BD' designation specifically identifies the industrial temperature range version packaged in the SOIC-8 format.

Programmable Timers And Oscillators Replacement Considerations

The datasheet explicitly lists the MC1455 as a direct replacement for NE555 timers. No other specific substitute part numbers are provided in the documentation.