NCP785AH50T1G

Product Overview

The NCP785AH50T1G from onsemi is a single-output positive fixed linear voltage regulator in a surface-mount SOT-89-3 package, corresponding to a TO-243AA case. It provides a 5 V fixed output and a rated output current of 10 mA, with a maximum input voltage of 450 V. The device has a quiescent current of 21 µA and a power-supply rejection ratio of 70 dB at 1 kHz. Built-in protection includes over-current and over-temperature limiting, and the specified operating temperature range is -40 °C to 85 °C. This regulator is suited to compact board designs where a stable 5 V rail is required for low-current circuitry, and the 5 V output is fixed rather than adjustable.

Key Features

• Fixed 5 V positive output with a 10 mA output current rating.
• Single regulator configuration in a surface-mount SOT-89-3 package, TO-243AA case.
• Maximum input voltage of 450 V.
• 21 µA quiescent current and 70 dB PSRR at 1 kHz.
• Over-current and over-temperature protection features.
• Operating temperature range from -40 °C to 85 °C.

Applications

• Auxiliary 5 V rail for low-current sensor, measurement, and instrumentation circuits.
• Bias supply for compact control-board, analog interface, and reference-rail circuitry.
• Regulated 5 V output for low-current digital logic or peripheral modules.

Design & Procurement Notes

Design & Procurement Notes: For board layout, the SOT-89-3 surface-mount package supports compact placement, while the 10 mA output current should be treated as a hard limit for load budgeting. The 450 V maximum input rating is useful where the regulator may see a high DC bus, but the 5 V output and low 10 mA current make the device most appropriate for auxiliary or bias rails rather than power delivery. The 21 µA quiescent current and 70 dB PSRR at 1 kHz are relevant when selecting input filtering and assessing supply noise, and the -40 °C to 85 °C operating range should be checked against the final assembly environment. Over-current and over-temperature protection can help with fault containment, but external pass elements, thermal paths, and load transients should still be evaluated. Because the maximum input rating is 450 V, input supply selection and transient handling should be reviewed separately from the 5 V load requirements.