100V, 1A SMD bridge rectifier

These tiny bridges are rated at 100V, 1A maximum continuous and measure around 6mm x 5mm x 1.6mm, not including leads. Leads have a 2.5mm spacing, making these ideal for turning regular polarised LEDs into AC LEDs - you can solder them on top of the LED's leads and then just snip the LED leads between the input and output of the bridge.

Of course, they have many other uses, such as polarity protection on low power circuits, anywhere you would normally use a low power bridge.

Made by DC Components, part number B1BF, datasheet is here.