[TriEmbed] Anyone need some darlington transistors ?

[Scott Hall]

I'm buying a bunch of TIP120 darlington-pair transistors for driving larger
loads from microcontroller I/O pins.
https://www.arrow.com/en/products/tip120/stmicroelectronics?wm_g_phyloc=1023285&wm_g_intloc=&gclid=CP_hkIbJlM8CFQooaQod7A0E4g&utm_source=google&utm_medium=cpc&utm_term=tip120&utm_campaign=us+-+sku+-+stmicroelectronics+-+dynamic+inventory#partsDetailsDatasheet

Rated for up to 60V up to 5A.  In my case 12VDC @ 1.5A

Anybody want some?

For those who aren't familiar with them, a pair of matched transistors in a
Darlington configuration:
[image: Image result]

can switch larger loads than just a single transistor.  Here is a typical
circuit:


By using 5 Volt power supply and DC Motor with 12 Volt and 1 A maximum
operating current:

RC = 0 Ohm (not use, connect directly to the 12 Volt power)
IB = IC / hFE = 1 A / 1000 = 0.001 A
RB = (VPORT – VBE) / IB = (4.2 – 1.4) / 0.001 = 2800 Ohm, use *2K7 Ohm*
resistor
P = (VPORT – VBE) x IB = (4.2 – 1.4) x 0.001 = 0.0028 watt, use *0.25 Watt*
resistor


-- 
Scott G. Hall
Raleigh, NC, USA
scottghall1 at gmail.com
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