BA17818T

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The BA17818T is a fixed positive standard linear voltage regulator manufactured by ROHM Semiconductor. It provides a nominal output voltage of 18V with a maximum output current capability of 1A. The device utilizes a TO-220FP package with three pins and operates within an ambient temperature range of -40°C to +85°C. Key electrical specifications include a maximum absolute input voltage of 35V, a minimum input voltage of 21V, and a maximum input voltage of 33V. The typical dropout voltage is 2V. Line regulation and load regulation are both specified at a maximum of 0.36%. The circuit draws a typical quiescent current of 4.5mA.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Integrated overcurrent protection circuitry prevents damage during short-circuit or overload conditions.
• Built-in thermal shutdown circuit automatically disables the output when excessive junction temperatures are detected.
• Provides stable fixed positive voltage regulation suitable for standard power supply applications.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• General-purpose linear power supply circuits requiring a stable 18V rail
• Industrial control systems utilizing through-hole mounting requirements
• Embedded electronics designs needing basic voltage regulation with thermal protection

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify the specific suffix designation (e.g., T, E1, E2) against the manufacturer's datasheet to ensure correct packaging and compliance status. Confirm that the TO-220FP pinout matches the target PCB footprint. Check for end-of-life notices or alternative component recommendations from ROHM, as older series components may have limited availability or be subject to manufacturing changes.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 18V output is required with up to 1A load capacity in a through-hole package. Ensure the input voltage remains between 21V and 33V to maintain proper regulation and avoid exceeding the maximum rating. Consider the thermal dissipation capabilities of the TO-220FP package relative to the expected power loss. Verify that the ±4% output voltage accuracy meets the system requirements.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the BA178xx series of fixed positive linear regulators from ROHM. The series includes various output voltages and packages such as TO-220CP and surface-mount options like TO-252. The BA17818T specifically denotes the 18V variant in the standard TO-220FP through-hole configuration, sharing core features like overcurrent and thermal protection with other members of the family.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

Direct substitutes include BA17818T-E1 and BA17818T-E2, which share identical electrical characteristics and pinouts. These variants differ primarily in packaging compliance codes or minor manufacturing revisions rather than functional performance. Verify compatibility before swapping.