NE556DT

Programmable Timers And Oscillators Overview

The NE556DT is a dual monolithic timer manufactured by STMicroelectronics, housed in an 8-pin SOIC surface-mount package. It integrates two independent 555-type timers within a single chip, enabling precise time delays or oscillation generation. The device operates with external resistors and capacitors for timing control. Key specifications include a supply voltage range of 4.5V to 16V, a maximum operating frequency of 100kHz, and a typical supply current of 20mA. It supports both astable and monostable modes and features TTL-compatible outputs.

Programmable Timers And Oscillators Feature Summary

• Dual Timer Configuration: Integrates two independent 555-type timers in one package.
• Surface Mount Package: Available in an 8-lead SOIC (SOP) format for automated assembly.
• Wide Voltage Operation: Functions reliably within a 4.5V to 16V supply range.
• TTL Compatibility: Output levels are compatible with Transistor-Transistor Logic families.

Programmable Timers And Oscillators Applications

• General-purpose pulse generation circuits
• Sequential timing events requiring dual channels
• Oscillator designs for low-frequency signals

Programmable Timers And Oscillators Procurement Notes

Verify the specific manufacturer marking on the component body, as 'NE556' is a generic designation used by multiple vendors including Fairchild and Texas Instruments. Confirm that the 'DT' suffix corresponds to the STMicroelectronics 8-lead SOIC package variant rather than other manufacturers' equivalent packages. Ensure the datasheet matches the required 4.5V-16V operating range and 100kHz frequency limit for the intended application.

Programmable Timers And Oscillators Selection Notes

Select this component when a dual-timer solution is required in a compact surface-mount footprint. Compare against the TS556 if lower power consumption (220μA vs 20mA) or higher frequency operation (2.7MHz vs 100kHz) is necessary. Verify that the bipolar NE556's 100mA output drive capability meets load requirements, as CMOS alternatives may have different drive strengths.

Programmable Timers And Oscillators Part Context

The NE556 series serves as a dual-channel alternative to the single NE555 timer. While the NE555 provides one timer channel, the NE556 consolidates two such channels into a single integrated circuit. This reduces board space and simplifies wiring for applications requiring synchronized or independent dual-timing functions without increasing component count.

Programmable Timers And Oscillators Replacement Considerations

The TS556 is a pin-to-pin and functionally compatible CMOS replacement offering significantly lower power consumption and higher maximum frequency. Other manufacturers produce equivalent parts under similar designations; verify package dimensions and electrical parameters before substitution.