> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 3.3V 800mA Linear Voltage Regulator - LD1117-3.3 TO-220

**Type:** Product page · **SKU:** ADA2165 · **Brand:** [Adafruit](https://core-electronics.com.au/brands/adafruit-australia)
**Page:** https://core-electronics.com.au/3-3v-800ma-linear-voltage-regulator-ld1117-3-3-to-220.html ([markdown](https://core-electronics.com.au/3-3v-800ma-linear-voltage-regulator-ld1117-3-3-to-220.html.md))

## Retired product

This product is retired and no longer available for purchase. Search the catalogue for an alternative.

## How to buy

- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

Ah the esteemed LD1117, who amongst Adafruit has not used this popular low drop voltage regulator? This big chunky regulator will help you get your 4-15V battery or wall adapter down to a nice clean 3.3V with 1% regulation. Perfect for just about all electronics! This is the TO-220 version, with up to 800mA current capability, and has internal current limiting + thermal shut-down protection which makes it sturdy and pretty much indestructible - at least electronics-wise (Adafruit are pretty sure a hammer might work...)

This regulator has a ~1V linear drop-out, better than the 780X series' 2V. That means you must give it at least 4.3V to get a clean 3.3V out. This regulator is often used to get a 5V power supply to a a clean 3.3V. There is a constant 'quiescent' current draw of 5mA.

This regulator can provide up to 800 mA as long as it has proper heat-sinking. The higher your input voltage and output current, the more heat it will generate. Without an extra heatsink, you can burn off up to 2W. Adafruit like this calculator for determining your heat sink requirements It's a TO-220 package, so use 62.5°C/Watt junction thermal resistance. The wattage of your set up is = (*InputVoltage* - 3.3V) \* *AverageCurrentInAmps*. E.g. a 9V power plug and 0.5 Amp of average output current means the regulator is burning off (9 - 3.3)\*0.5 = 2.85 Watts! [This setup would need a heat sink](https://core-electronics.com.au/to-220-clip-on-heatsink.html) Or you could use a 5V power supply for (5-3.3)\*0.5 = 0.85W which would not require a heatsink.

This regulator requires [at least 10uF electrolytic capacitors on both input and output for stability](https://core-electronics.com.au/10uf-50v-electrolytic-capacitors-pack-of-10.html)

## Technical Details

- [Datasheet](https://cdn-shop.adafruit.com/product-files/2165/LD1117.pdf)
- Dimensions: 29mm x 10mm x 4mm / 1.1" x 0.4" x 0.2"
- Pin Length: 13mm / 0.5"
 
 ![](https://core-electronics.com.au/media/wysiwyg/resources/rohs_icon.jpg)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/2/1/2165-00.jpg)