RES-TCH35 Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Very Low Inductance Design

TCH Series
35 Watt TO220 Package Thick Film Power
Ohmite’s TCH35 TO220 package
resistor provides 35W of steady state
power when properly used in today’s
well defined heat sink applications.
These very low induction resistors
are built under proprietary processes
that deliver more power handling
capability than other TO220 package
resistors of similar size.
Standard terminal forms are provid-
ed for manual or automatic insertion.
A single screw mounting tab con-
nects to the heat sink and should be
accompanied by the use of a thermal
compound. The TCH35 Series offers a
low thermal resistance to the heat sink
of <4.28°C/W.
F e at u r e s
• 35W Power Rating @ 25°C
• Very Low Inductance Design
• Single Screw Mounting
• Low Thermal Resistance to
Heat Sink @ RTH<4.28°C/W
• Resistance Element is
Electrically Insulated from
Metal Heat Sink Mounting Tab
a p p l i c at i o n s
• Switching Power Supplies
• Snubbers
• High Frequency
• Voltage Regulation
• Low Energy Pulse Loading
characteristics
Resistance Range 0.05Ω to 10KΩ (higher values on request sub-
ject to derating)
Resistance ± 5% standard; ± 1% available on request
Tolerance:
Temperature Referenced to 25°C, ∆R taken at +105°C
Coefficient 10Ω and above: ±50 ppm°C
For under 10Ω:
0R6 - 9R9: 100PPM
0R4 - 0R59: 150PPM
0R2 - 0R39: 250PPM
0R1 - 0R19: 500PPM
0R05 - 0R09: 1000PPM
Max. Operating 350V
Voltage
Dielectric Strength 1800 VAC
Insulation 10GΩ min.
Resistance
Momentary 2x rated power for 5 seconds as long as the
Overload applied voltage ≤1.5 times the continuous
operating voltage, where ∆R ±(0.3% + 0.01Ω)
max
Terminal Material Copper
Terminal Plating Lead Free Solder (97% Tin, 3% Silver)
Maximum Torque 0.9 Nm
Power Rating 35 Watts @ 25°C case temperature; see derat-
ing curve, below
Working -55°C to +175°C
Temperature
Range
Solder Process The TCH35 cannot exceed 260°C for more
than 10 seconds during soldering process
Test Condition
Load Life MIL-R-39009, 2000 Hours
@ Rated Pwr
Thermal MIL-R-STD-202, Method
Shock 107, Cond. F
High Freq MIL-R-STD-202, Method
Vibration 204, Cond. D
Terminal MIL-R-STD-202, Method
Strength 211, Cond. A (Pull Test)
2.4N
Moisture MIL-R-STD-202, Method
Resistance 106
Result ∆R
±(1.0% +0.01) Ω
±(0.3% +0.01) Ω max
±(0.2% +0.01) Ω max
±(0.2% +0.01) Ω max
± (0.5% +0.01) Ω max
Derating
100
TAH/TCH
20/35
80
16/28
60
12/21
TCH
40
8/14
TAH
20
4/ 7
0
0
0
25
50
75
100
125
150
175
Bottom of base plate Temperature, °C
(continued)
148
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