LDO regulator Texas Instruments LM1085 IT5.0 — fixed 5 V, TO-220 package

The Texas Instruments LM1085 IT5.0 is a fixed 5 V low-dropout (LDO) linear voltage regulator supplied in a TO-220 through-hole package. Designed to deliver a stable 5 V output with low dropout voltage, it is intended for board-level regulation where thermal performance and ease of mounting are important. The device integrates internal circuitry to provide output stability and protection features typical of modern linear regulators while remaining simple to implement in power supply designs for electronics, embedded systems, and consumer equipment.

Advantages

The LM1085 IT5.0 offers a low dropout voltage that allows regulation with small input-output differentials, improving efficiency in many 5 V applications. The TO-220 package provides effective heat dissipation and straightforward mounting for through-hole PCBs. Its fixed 5 V output simplifies design by removing the need for external setting resistors, and integrated protection aids reliable operation under varying load and thermal conditions.

Suitable for

• Board-level 5 V power rails for microcontrollers and digital logic
• Embedded systems and small single-board computers requiring regulated supply
• Power supplies for sensors, actuators, and peripheral devices
• Repair or retrofit of equipment where a TO-220 linear regulator is appropriate

Key specifications

• Output voltage: fixed 5 V
• Package type: TO-220 through-hole
• Device type: low-dropout (LDO) linear regulator
• Typical low dropout operation suitable for small input-output differentials
• Integrated protection and stability features for reliable output

How to use

Install the LM1085 IT5.0 on a PCB using the TO-220 mounting holes or a compatible heatsink for improved thermal dissipation when operating at higher currents. Connect the input supply to the regulator input pin, the regulated 5 V output to the load, and the common ground to the circuit ground. Add input and output capacitors as recommended in the device datasheet to ensure stability; place capacitors close to the regulator pins and select values and types that match the manufacturer’s guidance. Observe proper polarity and ensure the input voltage remains above the minimum required for regulation while below the device’s maximum rating.

Recommendations

For reliable performance, use low-ESR capacitors on the output as suggested by Texas Instruments, mount the TO-220 package to an adequate heatsink when drawing significant load current, and verify thermal limits in your application. Keep wiring short and provide adequate ventilation to maintain stable 5 V regulation under varying ambient and load conditions.