LM556CMX/NOPB

Programmable Timers And Oscillators Overview

The LM556CMX/NOPB is a dual timer integrated circuit manufactured by Texas Instruments, belonging to the LM556 series. It integrates two independent standard 555 timers within a single 14-pin SOIC package. The device operates with a supply voltage range of 4.5 V to 16 V and functions across a commercial temperature range of 0°C to +70°C. Each timer channel provides a TTL-compatible output capable of sourcing or sinking up to 200 mA. The component utilizes surface-mount technology and is supplied in tape-and-reel packaging for automated assembly processes.

Programmable Timers And Oscillators Feature Summary

• Dual Timer Architecture: Contains two independent 555 timers sharing a common power supply and ground.
• High Current Output: Provides 200 mA source and sink current capability per channel, compatible with TTL logic levels.
• Wide Supply Voltage Range: Operates reliably between 4.5 V and 16 V.
• Surface-Mount Packaging: Delivered in a 14-SOIC (Small Outline Integrated Circuit) package suitable for SMD/SMT installation.

Programmable Timers And Oscillators Applications

• Precision timing circuits requiring dual channels
• Pulse generation and width modulation
• Sequential timing events
• Frequency division applications

Programmable Timers And Oscillators Procurement Notes

Verify the specific suffix 'MX' indicates the reel packaging format when ordering. Confirm that the 'NOPB' designation ensures lead-free compliance and RoHS adherence as per Texas Instruments standards. Ensure the procurement quantity aligns with the standard reel size to avoid partial reel handling issues during manufacturing.

Programmable Timers And Oscillators Selection Notes

Select this component when two independent timing channels are required in a compact form factor. The LM556CMX/NOPB is suitable for designs needing high output drive current without external transistors. Consider the 14-pin SOIC footprint for PCB layout constraints. Verify that the operating temperature range of 0°C to +70°C meets the environmental requirements of the target application.

Programmable Timers And Oscillators Part Context

This part is part of the broader LM55x family of timers, which includes single (LM555), dual (LM556), and quad (LM558) variants. The LM556 specifically replaces discrete solutions using two separate LM555 chips, reducing board space and component count. It maintains pin compatibility with legacy NE556 designs while offering modern manufacturing standards through the NOPB designation.

Programmable Timers And Oscillators Replacement Considerations

The LM556CM is a direct functional equivalent without the NOPB suffix, though it may differ in lead-free compliance. Other manufacturers produce pin-compatible dual timers such as the NE556, but electrical parameters like supply voltage ranges and output currents should be verified against the TI datasheet before substitution.