AP851 50 Watts TO-220 High
Power Resistors
A high power TO-220 style resistor package designed for high frequency emitter
circuits in switching power supplies. Also used in voltage regulation and low energy
pulse loading.
50 Watts at 25C case temperature on heat sink
Single screw mounting to heat sink
Moulded case for proctection and easy to mount
Non-inductive design
Electrically isolated case
RoHS Compliant
Characteristics
Power rating: 2.25 Watts in free air
Operating voltage: 420V max
Dielectric strength: 1800Vac
Insulation resistance: 10G min
Temperature coefficient: As specified, referenced to 25C, R taken at +105C
Short time overload: R 0.3%, 2 times rated power with applied voltage not to exceed 1.5 times maximum continuous
operating voltage for 5 seconds
Load life: R 1.0%, 2000 hours at rated power
Damp heat with load: R 0.5%, 40 2C, 90 - 95% R.H max working voltage for 1000 hours with 1.5 hours ON and
0.5 hours OFF
Solderability: 90% min coverage, 245 5C for 3 seconds
Thermal shock: R 0.3%, -65C - 150C, 100 cycles
Terminal strength: R 0.2%, 2.4 N
Vibration and high frequency: R 0.2%, 20g peak
Electrical Specifications Derating Curve
Resistance Available Tolerance & Pref.
Available TCR
Value Range Value Ranges
100
R1 - 1R J (5%) K (10%) Not specified
80
1R02 - 3R 300ppm/C
F (1%) , J (5%) ,
60
100ppm/C
K (10%)
3R01 - 10R
200ppm/C
40
50ppm/C
20
D (0.5%) F (1%) J
10R2 - 10K 100ppm/C
(5%) K (10%)
0
200ppm/C
0 25 50 75 100 125 150 175
Preferred value ranges:
Case Temperature (C)
F (1%) - E96 , J (5%) - E24, K (10%) - E12
ARCOL UK Limited, The information contained herein does not form part of a
Threemilestone Ind. Estate, contract and is subject to change without notice. ARCOL
Truro, Cornwall, TR4 9LG, UK. operate a policy of continual product development, therefore,
T +44 (0) 1872 277431 specifications may change.
F +44 (0) 1872 222002
It is the responsibility of the customer to ensure that the
E sales arcolresistors.com
@
component selected from our range is suitable for the intended
www.arcolresistors.com application. If in doubt please ask ARCOL.
Page 1 of 2 2/13.18
Power Rated %AP851 50 Watts TO-220 High
Power Resistors
Dimensions (mm)
0.115 0.135"
0.40 0.42"
(2.92 3.44mm)
2.92 - 3.44
(10.15 10.67mm)
10.15 - 10.67
0.121 0.129"
(3.08 3.28mm)
3.08 - 3.28
0.045 0.055"
(1.14 1.40mm) 0.016 0.024"
1.14 - 1.40
(0.40 0.60mm)
0.40 - 0.60
0.19 0.21"
0.06 0.08"
(4.82 5.34mm)
4.82 - 5.34
(1.52 2.04mm)
1.52 - 2.04
0.026 0.034"
(0.66 0.86mm)
0.66 - 0.86
ARCOL UK Limited, The information contained herein does not form part of a
Threemilestone Ind. Estate, contract and is subject to change without notice. ARCOL
Truro, Cornwall, TR4 9LG, UK. operate a policy of continual product development, therefore,
T +44 (0) 1872 277431 specifications may change.
F +44 (0) 1872 222002
It is the responsibility of the customer to ensure that the
E sales arcolresistors.com
@
component selected from our range is suitable for the intended
www.arcolresistors.com application. If in doubt please ask ARCOL.
Page 2 of 2
2/13.18
0.115 0.135"
(2.92 3.44mm)
0.10 0.16"
2.92 - 3.44
(2.542.54 - 44.06m.0m6)
0.45 0.55"
0.63 0.65"
(11.43 13.97mm)
11.43 - 13.97
(16.00 16.52mm)
16.00 - 16.52