SA556DT

Programmable Timers And Oscillators Overview

The SA556DT is a dual CMOS timer integrated circuit manufactured by STMicroelectronics, housed in a 14-SOIC surface-mount package. It serves as a pin-to-pin and functionally compatible replacement for the bipolar NE556 series. The device operates within a wide voltage range of 2 V to 16 V. Key electrical characteristics include a typical supply current of 220 μA at 5 V and 180 μA at 3 V, with a maximum astable frequency of 2.7 MHz. It features high input impedance (10^12 Ω) and output compatibility with TTL, CMOS, and logic MOS families.

Programmable Timers And Oscillators Feature Summary

• Very low power consumption: 220 μA typ at VCC= 5 V; 180 μA typ at VCC= 3 V
• High maximum astable frequency up to 2.7 MHz
• Pin-to-pin and functionally compatible with bipolar NE556
• Wide voltage range operation from 2 V to 16 V

Programmable Timers And Oscillators Applications

• General-purpose timing circuits requiring low power
• Pulse generation and shaping applications
• Replacement for bipolar NE556 timers in existing designs

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix 'DT' corresponds to the 14-SOIC package and temperature grade required for the application. Confirm availability status as component lifecycles may change. Ensure decoupling capacitor values are appropriate for the reduced supply current spikes characteristic of this CMOS device compared to bipolar equivalents.

Programmable Timers And Oscillators Selection Notes

Select the SA556DT when low quiescent current and high-frequency operation are required compared to standard bipolar timers. The CMOS technology allows for minimized timing capacitors due to high input impedance. Verify that the 14-SOIC package fits the PCB layout constraints and thermal requirements of the target design.

Programmable Timers And Oscillators Part Context

The SA556 is part of STMicroelectronics' family of dual CMOS timers. It shares the same core architecture and performance benefits as the single-channel SA555, providing two independent timer channels in one package. This integration supports space-constrained designs needing multiple timing functions without increasing component count.

Programmable Timers And Oscillators Replacement Considerations

The SA556DT is directly compatible with the NE556. No external component changes are typically required for basic functionality. However, verify that the load conditions remain within the specified limits for the CMOS output stage.