LM1108SF-1.8

Overview

The LM1108SF-1.8 is a fixed-output CMOS low-dropout regulator manufactured by HTC, providing a regulated 1.8V output with a maximum load current of 300mA. It operates within an ambient temperature range of -40°C to +85°C and features high output voltage accuracy of ±1.5%. The device incorporates over-current and thermal shutdown protection, ensuring stability with a minimum 1µF output capacitor.

Feature Summary

• Ultra-low supply current consumption typically at 50µA under full load conditions
• Integrated thermal shutdown and over-current limiting for enhanced reliability
• Capable of maintaining regulation with standard MLCC output capacitors

Applications

• Battery-operated portable systems
• Portable computers and handheld devices
• Medical instruments requiring stable power rails
• Linear post-regulators for switching power supplies

Procurement Notes

Verify the specific manufacturer origin as TAEJIN may indicate a distributor or secondary source; confirm HTC datasheet alignment. Ensure the SOT-23 package variant matches the required PCB footprint. Validate that the 1.8V fixed output meets the target circuit design specifications before procurement.

Selection Notes

Select this component when low quiescent current and small form factor are critical. The SOT-23 package suits space-constrained designs. Verify input voltage remains above the dropout threshold during peak load to maintain regulation. Consider thermal dissipation limits if operating near maximum current ratings.

Part Context

This part belongs to the LM1108 series of 300mA CMOS LDO regulators from HTC. The SF suffix denotes the SOT-23 three-terminal package configuration. The '1.8' indicates the fixed internal reference voltage setting. This family offers alternatives in SOT-89 and SOT-23-5L packages for different thermal or pin-out requirements.

Replacement Considerations

Direct substitutes include other 300mA CMOS LDOs with 1.8V fixed output in SOT-23 packages. Verify pin compatibility and thermal resistance values. Check if alternative manufacturers offer equivalent dropout voltages and current limits for the specific application environment.