NJM7809FA

Product Overview

Nisshinbo Micro Devices Inc. NJM7809FA is a linear voltage regulator IC that provides a fixed positive 9V output from a single regulator channel. The device is supplied in a through-hole TO-220F package and is rated for up to 1.5A output current. Its specified input voltage maximum is 35V, and it includes over-temperature and short-circuit protection. The operating temperature range is -40°C to 85°C.

Key Features

• Fixed positive 9V output from one regulator channel.
• Output current rating of 1.5A.
• Maximum input voltage of 35V.
• Quiescent current of 6 mA.
• Power-supply rejection ratio of 72dB at 120Hz.
• Over-temperature and short-circuit protection features.
• Operating temperature range of -40°C to 85°C.
• Through-hole TO-220-3 Full Pack package (TO-220F).

Applications

• Fixed 9V supply for control, logic, or instrumentation circuits.
• Linear regulation stage in DC-powered embedded or measurement systems.
• Through-hole power board applications requiring a single positive regulator output.
• Input-to-output voltage conversion within the 35V maximum input limit.

Design & Procurement Notes

When selecting the NJM7809FA, verify that the input voltage is suitable for the 9V fixed output while not exceeding the 35V maximum, and account for the 6 mA quiescent current in the power budget. Because the device uses linear regulation, thermal dissipation increases with input-output voltage differential and load current, so board layout and through-hole TO-220F mounting should support heat removal within the -40°C to 85°C operating range. The PSRR value is specified at 120Hz, so use it for ripple rejection expectations at that test condition rather than assuming broadband behavior. The over-temperature and short-circuit protection features can help in single-output regulator designs, but the fixed 9V output and 1.5A rating define the usable operating envelope.