3.3 V Voltage Regulators

TS2950CT-3.3 Pinout

The TS2950CT-3.3 is a 3.3 V regulator in a TO-92 package. It is a commonly found regulator and very low cost. The diagram above shows the pin configuration of the component, where pin 1 is the regulated output, pin 2 is the ground, and pin 3 is the input. If you are creating Raspberry Pi projects, it is a good idea to use one of these voltage regulators to convert 5 volts to provide a 3.3-volt rail for the projects. Although the Raspberry Pi provides 3.3 V through the GPIO pins, if your project had a short, then you are likely to damage the on-board regulator, and a replacement Raspberry Pi regulator will prove to be costly and time consuming to change.

Pinout

Pinout

The TS2950CT-3.3 is the most widely available voltage regulator in a plastic TO-92 package, and appears as in the diagram shown above. If you are looking at it from the top then the leftmost pin is the output. Most people prefer this side of the pin to be input; however, you can turn it round as shown below to suite your needs.

Pinout by Turning Round

Pinout by Turning Round

The two most commonly available and the cheapest voltage regulators I was able to find were the LP2950, and TS2950. They both follow this same pin configuration. They both have a wide input voltage range of up to 30 V, and rated output current of 100 mA, which is good enough to drive a few logic chips. They have current and thermal limiting features and accuracy of 1.4 % at 25 °C.

Where to Get

There are many shops on Google selling these and are all listed at the top if you use the following search criteria.

  • Maplin
  • “N68CA TS2950CT-3.3”
  • eBay
  • “5 x LP2950 Voltage Regulator”
  • Farnell
  • “LP2950-33LPE3 1755063”