LM211DG

Overview

The LM211DG is a single analog comparator manufactured by onsemi, housed in an SOIC-8 surface-mount package. It operates from a single power supply ranging from 5.0 V to 30 V or split supplies up to ±15 V. The device features a response time of 200 ns and supports output currents up to 50 mA, enabling direct driving of relays, lamps, or solenoids. It includes strobe capability for output control and offers complementary outputs (open collector and open emitter). The input offset voltage is typically 3.0 mV at +25 °C with a source resistance ≤ 50 kΩ.

Feature Summary

• Capable of driving loads referenced to ground, the positive supply, or the negative supply, allowing compatibility with DTL, RTL, TTL, and MOS logic families.
• Output stage can switch voltages up to 50 V at currents reaching 50 mA, suitable for driving high-power loads such as relays and solenoids.
• Includes a strobe pin that allows the output to be disabled independently of the input comparison state when driven by a current source.
• Inputs can be isolated from system ground while maintaining output functionality relative to supply rails.

Applications

• Driving relays, lamps, or solenoids via high-current output switching
• Zero-crossing detection circuits interfacing with CMOS logic
• Voltage monitoring systems requiring isolation between input ground and load reference

Procurement Notes

Verify the specific suffix 'DG' corresponds to the SOIC-8 package configuration as listed in the ordering information table. Confirm RoHS compliance status and Pb-Free marking requirements for the target assembly process. Check for discontinuation notices regarding this specific part number variant before finalizing design-in decisions.

Selection Notes

Select this component when a single-channel comparator with high-voltage output switching capability is required. Ensure the application benefits from the ability to reference the output load to either supply rail rather than just ground. Consider the 200 ns response time against signal speed requirements and verify that the 50 mA output current meets load drive needs without external buffering.

Part Context

The LM211DG belongs to the LM211/LM311 family of single comparators produced by onsemi. It shares functional characteristics with the LM311 but differs in temperature range specifications. The 'D' suffix denotes the SOIC-8 package, while 'G' indicates a Pb-Free manufacturing process. This part is distinct from quad comparator variants like the LM339.

Replacement Considerations

LM211DR2G: Same manufacturer, SOIC-8 package, Tape & Reel shipping instead of Rail.