|Forward voltage drop:||3.2 V|
|Max forward current:||30 mA|
|Luminous intensity:||5000 mCd (@20mA)|
|Lens types:||Water clear|
A video about LED current limits taken from our Ask Kitronik Live event 2012.
Learn how to use a through hole LED in a simple E-Textiles circuit in our easy to follow tutorial.
Learn how to position LEDs through fabric in our easy to follow tutorial.
How many of these will run off a 9v battery and will they need a resistor?
Posted byon Monday, 5 September 2011The forward voltage on the LED is 3.5V, this means that when the LED is lit there will be around 3.5V across it. If you put two in series then across the pair the voltage drop will be 7V. With 3 it would be 10.5V. So to answer the first part of the question you can drive two LEDs from a 9V battery. To answer the second part, as the battery is at 9V and the LEDs have 7V across then the resistor must have 2V across it. Depending on how bright you want the LEDs to be will depend on the resistor value. Lets suppose we go for 20mA flowing through the LEDs, then there will also be 20mA flowing through the resistor. So using Ohms law, if V=2V and I=0.02A then R=100 ohms.
Can these be powered by a USB source? (5volt?)
Posted byon Tuesday, 5 April 2011Yes you can drive this LED from 5V however you MUST USE A CURRENT LIMIT RESISTOR. On the white USB lamp kit we use a 150 ohm resistor, which is plenty bright enough, you can go down to a 100 ohm which will give you about 20mA. If you are unsure about which resistor to use we have a nice tool in the resources section. The USB port can supply 100mA without negotiation so could run up to 5 white LEDs.
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