Resistors
Heatsink Mount High Power Resistors
WMHP Series
TO-220 & TO-247 standard power packages
Very low thermal resistance
Non-inductive thick film technology
20 to 100 watt high power resistors
Single screw mounting to heatsink
Tailored heatsink WMHP-HS available
Suitable for high frequency / fast pulse use
All parts are Pb-free and comply with EU Directive 2011/65/EU (RoHS2)
Electrical Data
WMHP20
Package style
Power rating
Power rating
Limiting element voltage
Resistance range
Dielectric strength
Working temperature range
Insulation resistance
Tolerances
TCR
Standard values
watts
watts
volts
ohms
volts
°C
ohms
%
ppm/°C
-65 to 150
>10G
≤1R0: ±5 >1R0: ±1, ±5
≤R20: ±1000 >R20–3R0: ±300 >3R0-10R: ±100 >10R: ±50
25 to 105°C
E24 preferred
20
1.5
WMHP35
TO-220
35
2.5
350
R05 – 10K
1800
-65 to 175
Between terminals and tab
ac rms for 60s
50
3
WMHP50
WMHP100
TO-247
100
3.5
700
Heatsink with 25°C flange temperature
Without heatsink, in free air 25°C
dc or ac rms
Conditions
Physical Data
Dimensions (mm) & Weight (g)
TO-220
TO-247
A
10.16 ±0.25
15.75 ±0.26
B
15 ±0.3
20.7 ±0.26
C
4.6 ±0.2
4.95 ±0.26
D
3.85 ±0.15
3.63 ±0.1
E
13.75 ±0.5
14.48 ±1.27
F
4 max
2.79 ±0.76
G
5.08 ±0.25
3.63 ±0.18
H
0.78 ±0.08
1.52 ±0.1
J
1.3 ±0.1
10.16 ±0.26
K
6.4 ±0.25
5.33 ±0.26
L
0.51 ±0.15
0.81 ±0.26
M
2.27 ±0.25
2.41 ±0.26
Wt
2.0 nom
3.7 nom
TO-220
TO-247
Performance Data
Load at Rated Power:
2000hrs at rated power
Test
Short Term Overload:
2 x rated power with applied voltage not to exceed 1.5 x maximum continuous operating voltage for 5 seconds
Damp Heat with Load:
40 ±2°C, 90 – 95% RH, maximum working voltage 1.5 hours on, 0.5 hours off, 1000 hours
Thermal Shock:
-65°C/150°C, 100cycles
Terminal Strength:
2.4N pull test
±∆R%
±∆R%
±∆R%
±∆R%
±∆R%
Performance
1
0.5
1
0.3
0.2
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
09.17
Resistors
Heatsink Mount High Power Resistors
WMHP Series
WMHP Series
unt High Power Resistors High Power Resistors
Heatsink Mount
Temperature Derating
Temperature Derating
Mounting
The resistor should be mounted to a heatsink using
a suitable thermal interface material. The maximum
tightening torque for the M3 mounting screw is 0.9Nm.
A tailored heatsink is available which accommodates both
TO-220 and TO-247 package styles. This is WMHP-HS and
product data is available at
http://www.ttelectronics.com/sites/default/files/resistors-
datasheets/WMHP-HS.pdf
TO-247
TO-220
TO-247
TO-220
Pulse Performance
Pulse Performance
Single Pulse (P
mean
<< P
r
) Condition
Typical High Frequency Performance High Frequency Performance
Typical
ingle Pulse (P
mean
<< P
r
) Condition
1000
Peak Power (W)
100
WMHP100
WMHP50
WMHP35
WMHP20
10
0.1
1
10
100
1000
10000
100000
Pulse Duration (ms)
ns ≥1s is dependentPulse performance for durations ≥1s is dependent on mounting conditions. The short term
on mounting conditions. The short term
Typical high frequency characteristics for WMHP35-220R.high frequencyfrequency is 1GHz. WMHP35-220R. Self resonant frequency is 1GHz.
Typical Self resonant characteristics for
wer rating for 5s. overload power limit is 2 x power rating for 5s.
Procedure
Ordering Procedure
0KJ
(WMHP35 at 10 kilohms ±5%, Pb-free)
Example: WMHP35-10KJ
(WMHP35 at 10 kilohms ±5%, Pb-free)
General Note
TT Electronics reserves the right to make changes in product specification without notice or liability.
All information is subject to TT Electronics’ own data and is considered accurate at time of going to print.
BI Technologies IRC Welwyn
www.ttelectronics.com/resistors
© TT Electronics plc
www.ttelectronicsresistors.com
www.ttelectronicsresistors.com
09.17
Embedded System
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