A patch resistor is a surface-mounted resistance device, also known as an SMT resistor. It encapsulates the resistive material on a ceramic or plastic sheet and is fixed to the circuit board by surface mounting technology. Compared with traditional plug-in resistors, patch resistors are smaller, more stable, and can be efficiently automated on a large scale, so they are widely used in electronic products.

The relationship between the package and power of the patch resistor is as follows:

Package rated power @ 70°C *** Operating voltage (V) Imperial (mil) Metric (mm) Conventional power series Increased power series

0201 0603 1/20W / 25

0402 1005 1/16W / 50

0603 1608 1/16W 1/10W 50

0805 2012 1/10W 1/8W 150

1206 3216 1/8W 1/4W 200

1210 3225 1/4W 1/3W 200

1812 4832 1/2W / 200

2010 5025 1/2W 3/4W 200

2512 6432 1W / 200

Note: Voltage =√ power x resistance value (P=V2/R) or *** The smaller of the two operating voltage