LB1861M-TLM-E

Overview

The LB1861M-TLM-E is a two-phase half-wave variable speed fan motor driver manufactured by onsemi. It operates within a supply voltage range of 2.5 V to 9 V and supports load voltages of 12 V and 24 V. The device features a surface-mount MFP14S (SOIC14 W) package with a maximum power dissipation of 1.1 W. It functions across an operating temperature range of -30°C to 80°C or -40°C to +85°C depending on specific configuration, with a working supply current of 22 mA.

Feature Summary

• Integrates a two-speed mode select function for full speed and low speed operation requiring minimal external components
• Supports thermistor-controlled continuous speed adjustment for precise thermal management
• Designed specifically for driving two-phase half-wave variable speed fan motors

Applications

• Variable speed fan motor control in consumer electronics
• Thermistor-based cooling systems
• Two-phase half-wave motor applications

Procurement Notes

Verify the exact operating temperature range (-30°C to 80°C vs -40°C to +85°C) against the specific datasheet revision, as sources vary. Confirm the package designation matches MFP14S or SOIC14 W dimensions. Ensure compatibility with 12 V and 24 V load requirements. Check for end-of-life status implications if applicable.

Selection Notes

Select this component for designs requiring integrated two-speed control without complex external circuitry. It is suitable for applications needing thermistor input for automatic speed regulation. Verify that the 1.1 W power dissipation limit accommodates the thermal environment. Ensure the MFP14S package fits the PCB layout constraints.

Part Context

This part belongs to the LB1861 series of motor drivers from onsemi. It is categorized under motor/ motion/ ignition controllers and drivers. The TLM-E suffix indicates a tape and reel packaging format. It is distinct from similar models like the LB1836ML or LB11921T which may have different pinouts or drive capabilities.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.