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Resistor Types

Resistor types

Resistor Type	Ohm range Min	Ohm Range Max	Temp-co Min PPM	Temp-co Max PPM	Parasitics
Carbon	1	22M	400	1300	low
Carbon Film (CF)	10	10M	500	800	Mid
Metal Film (MF)	10	1M	25	1000	mid
Metal Element	.0002	1	75	110	??
Metal Foil	.0001	150k	0.2	150	??
Metal Oxide(MO)	1	30M	100	200	??
Thick Film	.001	100G	80	800	Mid
Thin Film	.001	10M	5	500	Mid
Wire Wound	.005	50K	20	600	High
Diffused	?	?	?	?

Diffused resistors (inside an ICs) track well
Parasitics can be of both capacitance and inductance.
When working with high-voltage - pay attention to the rating
Most applications de-rate the power rating by half.
Metal oxide resistors are often good for more than 1/2 watt applications - tough and withstand transients.

Case to wattage

Case size mils	Case Size metric	Mill Wattage	Wattage	Relative price
01005	0402	0.031
0201	0603	0.05
0402	1005	0.0625	0.167	3.6
0603	1608	0.0625	0.1	2.10
0805	2012	0.100	0.125	2.50
1206*	3216	0.125	0.250	3.90
1210	3225	0.250	0.333
2010	5025	0.500	0.750
2512	6432	1.00
2045	50???	1.00	2

Note - Resistors are normally de-rated by 50% for a good life span. The area of these chip resistors is the same no matter what wattage they are rated - the surface may be a different material, but the insides are still hotter if the manufacturer rates them higher. Conservative design would tell us to use the lower values. ®

Normal 1% (E96 series) values

1.00
1.02
1.05
1.07
1.10
1.13
1.15
1.18
1.21
1.24
1.27
1.30
1.33
1.37
1.40
1.43
1.47
1.50
1.54
1,58
1.62
1.65
1.69
1.74
1.78
1.82
1.87
1.91
1.96
2.00
2.05
2.10
2.16
2.21
2.36
2.32
2.37
2.43
2.49
2.55
2.61
2.67
2.74
2.80
2.87
2.94
3.01
3.09
3.16
3.24
3.32
3.40
3.48
3.57
3.65
3.74
3.83
3.92
4.02
4.12
4.22
4.32
4.42
4.53
4.64
4.75
4.87
4.91
5.11
5.23
5.36
5.49
5.62
5.76
5.90
6.04
6.19
6.34
6.49
6.65
6,81
6.98
7.15
7.32
7.50
7.68
7.87
8.06
8.25
8.45
8.66
8.87
9.09
9.31
9.59
9.76

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