Power test data with various heat sinks
TCH Series
35 Watt TO220 Package Thick Film Power
Ohmite's TCH35 TO220 package resistor provides 35 watts of steady state power when properly used in today's well defined heat sink applications.
These very low inductance resistors are built under proprietary processes that deliver more power handling capability than other TO-220 package resistors of similar size.
Standard lead forms are provided for manual or automatic insertion.
A single screw mounting tab connects 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.
TEST DATA
| Load Life | MIL-R-39009, 2000 Hours @ Rated Pwr | delta-R = ± (1.0% + 0.01) ohm |
| Thermal Shock | MIL-R-STD-202, Method 107, Cond. F | delta-R = ± (0.3% + 0.01) ohm max |
| High Frequency Vibration | MIL-R-STD-202, Method 204, Cond. D | delta-R = ± (0.2% + 0.01) ohm max |
| Terminal Strength | MIL-R-STD-202, Method 211, Cond. A (Pull Test) 2.4N | delta-R = ± (0.2% + 0.01) ohm max |
| Moisture Resistance | MIL-R-STD-202, Method 106 | delta-R = ± (0.5% + 0.01) ohm max |
APPLICATIONS
- Switching Power Supplies
- Low & High Frequency Snubbers
FEATURES
- 35W Power Rating @ 25°C
- Very Low Inductance Design
- Manufactured in an ISO 9000 Registered Facility
- Single Screw Mounting Simplifies Heat Sink Attachment
- Low Thermal Resistance to Heat Sink @ RTH <4.28°C/W
- Resistance Element is Electrically Insulated from Metal Heat Sink Mounting Tab
SPECIFICATIONS
Electrical
- Resistance Range: 1 ohm to 10K ohm (higher values on request subject to derating)
- Resistance Tolerance: ±1% to ±10%, 5% standard (0.5% available on request)
- Temperature Coefficient: Referenced to 25°C, delta-R taken at +105°C
10 ohm and above ±50 ppm°C
For under 10 ohms:
| 0R6 - 9R9 | 100PPM |
| 0R4 - 0R59 | 150PPM |
| 0R2 - 0R39 | 250PPM |
| 0R1 - 0R19 | 500PPM |
| 0R05 - 0R09 | 1000PPM |
- Max. Operating Voltage: 350V
- Dielectric Strength: 1800 VAC
- Insulation Resistance: 10G ohm min.
- Momentary Overload: 2x rated power for 5 seconds as long as the applied voltage </=1.5 times the continuous operating voltage, where delta-R ±(0.3% + 0.01 ohm) 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 Derating Curve
- Working Temperature Range: -55°C to +175°C
- Solder Process: The TCH35 cannot exceed 260°C for more than 10 seconds during soldering process.
DERATING CURVE
HEAT SINK POWER COMPARISON
HOW TO ORDER
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Standard part numbers
Suggested Heatsinks