RIEDON
TO-220 Housing
Rated Power 10 Watts
Resistances from 0.5 to 150K Ohms
High Stability Foil Resistance Elements
Resistance Tolerance to ± 0.02%
Operating Temperature -55°C to +155°C
Low Inductance ( <50nH ) and Thermal EMF
PF1220 Series
Precision Foil Power Resistors
Riedon's TO-220 precision foil resistors satisfy demanding applications for high accuracy and
stable power resistors housed in the convenient TO-220 case. The PF1220s Nichrome foil resistance
element makes a wide resistance range available. It is bonded to an Al
2
O
3
substrate ensuring excellent
power dissipation and stability. Careful choice of materials and rugged construction ensure a reliable
component, and the very small tolerance and temperature coefficient provide high precision in difficult
applications.
SPECIFICATIONS
Resistance Range -
0.5 to 150K Ohms
( 100 Ohm Max. for 4-Terminal )
Free Air Power Rating -
1.5 Watts ( Tambient=70°C )
Power Rating on Heatsink -
10 Watts ( Theatsink=25°C )
Thermal Resistance -
10.8°C/W
Temperature Coefficient -
± 1ppm/°C ( +20°C to +60°C )
± 3ppm/°C ( -55°C to +125°C )
± 5ppm/°C ( -55°C to +155°C )
Stability -
0.01%
Thermal EMF -
< 1mV/°C
Proof Voltage -
1KVDC
Maximum Current -
25 A
Operating Temperature -
-55°C to +155°C
Resistance Element -
Nichrome Foil
Substrate -
Al2O3
Housing -
Epoxy or PPS
Leads -
Cu, Tinned, 2 or 4 pin
Ordering information:
Part Number - Resistance - Tolerance - TCR
Example:
PF1220 0.5 Ohm 0.1% 5ppm
Resistance
0.5 to <10W
³10
to <50W
³50W
Tolerances Available (±%)
0.1, 0.25, 0.5, 1
0.05, 0.1, 0.25, 0.5, 1
0.02, 0.05, 0.1, 0.25, 0.5, 1
PF1220
Power Derating Curve
120
100
80
60
40
20
0
Power Level %
25 40 55 70 85 100 115 130
Heatsink Temperature
°C
Riedon Inc.
REV 6/05
300 Cypress Avenue
Alhambra CA 91801
www.riedon.com
(626) 284-9901
Fax: (626) 284-1704
京公网安备 11010802033920号
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