The TAH20 is a completely
encapsulated thick film resistor
in the TO220 package outline.
Rated for 20 watts @ 25°C
case temperature, these resis-
tors are electrically isolated,
and molded in a high tempera-
ture case.
Designed for heat sink
mounting, the symmetrical
package is ready for use with
snap-on style heat sinks (we
recommend use of thermal
grease). The TAH20 Series is
very low induction, and avail-
able in a wide range of resis-
tance values in standard 5%
tolerance. 1% tolerance avail-
able by special order.
SPECIFICATIONS
Electrical
Resistance Range:
0.05Ω to
10KΩ, other values available
upon request
Tolerance:
±5% std.
1% Available on request
Temperature Coefficient:
Referenced to 25°C,
ΔR
taken at +105°C;
1 to 10Ω: ±(100ppm+0.002Ω)/°C
10Ω & up: ±50ppm/°C
Max Operating Voltage:
350V
Dielectric Strength:
1,800 VAC
Power Rating:
20W @ 25°C case
temperature; see derating curve,
next page
Insulation Resistance:
10GΩ min.
Momentary Overload:
2x rated power for 5 seconds
where applied voltage
≤1.5
times
max. operating voltage.
ΔR
±
(0.3% + 0.001Ω) max.
Terminal Material:
Copper
Terminal Plating:
Lead Free
Solder (97% Tin, 3% Silver)
Mounting:
Requires the use of a
snap-on style heat sink. A ther-
mal compound should be prop-
erly applied.
Solder Process:
The TAH20 can-
not exceed 260°C for more than
10 seconds during soldering
process.
TAH20 Series
20 Watt TO220 Style
Thick Film Power Resistors
RoHS Compliant
0.400–0.420"
(10.15–10.67mm)
0.115–0.135"
(2.92–3.44mm)
0.630–0.650"
(16.00–16.52mm)
FEATURES
• 20 Watt Power Rating at 25°C
Case Temperature
• High Pulse Tolerant Design
• Quick-snap Molded Package
• Very Low Inductance Design
• Resistor Package Electrically
Isolated from Heat Sink
• Low Thermal Resistance to Heat
Sink @ R
TH
<6.25°C/W
• Tube Packaging Available
0.450–0.550"
(11.43–13.97mm)
0.100–0.160"
(2.54–4.06mm)
0.045–0.055"
(1.14–1.40mm)
0.026–0.034"
(0.66–0.86mm)
0.016–0.024"
(0.40–0.60mm)
0.190–0.210"
(4.82–5.34mm)
Load Life
Thermal Shock
High Freq Vibration
Terminal Strength
0.060–0.080"
(1.52–2.04mm)
ΔR
= ±(1.0% + 0.001)
Ω
ΔR
= ±(0.3% + 0.001)
Ω
max
ΔR
= ±(0.2% + 0.001)
Ω
max
ΔR
= ±(0.2% + 0.001)
Ω
max
ΔR
= ±(0.5% + 0.01)
Ω
max
P E R F O R M A N C E D ATA
MIL-R-39009, 2000 Hours @ Rated Pwr
MIL-R-STD-202, Method 107, Cond. F
MIL-R-STD-202, Method 204, Cond. D
MIL-R-STD-202, Method 211, Cond. A
(Pull Test) 2.4N
Moisture Resistance
MIL-R-STD-202, Method 106
APPLICATIONS
• Frequency Conversion
• High Frequency Balancing
• Snubbers
(continued on next page)
Ohmite’s new 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 proprie-
tary processes that deliver 75%
more power handling capabil-
ity than other TO220 package
resistors of similar size.
Standard lead forms are
provided for manual or auto-
matic 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.
SPECIFICATIONS
FEATURES
• 35W Power Rating @ 25°C
• Very Low Inductance Design
• Single Screw Mounting
• Low Thermal Resistance to Heat
Sink @ R
TH
<4.28°C/W
• Resistance Element is Electrically
Insulated from Metal Heat Sink
Mounting Tab
APPLICATIONS
• Switching Power Supplies
• Snubbers
• High Frequency
• Voltage Regulation
• Low Energy Pulse Loading
Ohmite Mfg. Co.
Electrical
Resistance Range:
0.1Ω to 10KΩ
(higher values on request subject
to derating)
Resistance Tolerance:
± 5% standard
± 1% available on request
Temperature Coefficient:
Referenced to 25°C,
0.390–0.410"
0.047–0.055"
ΔR
taken at +105°C
(9.91–10.41mm)
(1.20–1.40mm)
10Ω and above: ±50 ppm°C
0.112–0.120"
1Ω to10Ω:
(2.85–3.05mm)
±(100ppm +0.002Ω)/°C
0.230–0.250"
Max. Operating Voltage:
350V
(5.85–6.35mm)
0.571–0.591"
Dielectric Strength:
1800 VAC
(14.50–15.00mm)
Insulation Resistance:
10GΩ
min.
Momentary Overload:
2x rated
0.046–0.054"
0.157" max.
0.159–0.190"
power for 5 seconds as long as
(1.17–1.37mm)
(5.00mm)
(4.06–4.82mm)
the applied voltage
≤1.5
times
0.027–0.034"
the continuous operating voltage,
0.022–0.028"
0.500–0.579"
where
ΔR
±(0.3% + 0.01Ω) max
(0.70–0.86mm)
(0.55–0.70mm)
(12.70–14.70mm)
Terminal Material:
Copper
0.080–0.089"
Terminal Plating:
Lead Free
(2.05–2.25mm)
Solder (97% Tin, 3% Silver)
0.190–0.210"
Maximum Torque:
0.9 Nm
(4.83–5.33mm)
Power Rating:
35 Watts @ 25°C
case temperature; see derating
P E R F O R M A N C E D ATA
curve, next page
Load Life
MIL-R-39009, 2000 Hours @ Rated Pwr
ΔR
= ± (1.0% + 0.01)
Ω
Working Temperature Range:
Thermal Shock
MIL-R-STD-202, Method 107, Cond. F
ΔR
= ± (0.3% + 0.01)
Ω
max
-55°C to +175°C
High Freq Vibration
MIL-R-STD-202, Method 204, Cond. D
ΔR
= ± (0.2% + 0.01)
Ω
max
Solder Process:
The TCH35 can-
Terminal Strength
MIL-R-STD-202, Method 211, Cond. A
ΔR
= ± (0.2% + 0.01)
Ω
max
not exceed 260°C for more than
(Pull Test) 2.4N
10 seconds during soldering
Moisture Resistance
MIL-R-STD-202, Method 106
ΔR
= ± (0.5% + 0.01)
Ω
max
process.
TCH35 Series
35 Watt TO220 Style
Thick Film Power Resistors
RoHS Compliant
ø0.139–0.148"
(3.55–3.75mm)
(continued on next page)
1600 Golf Rd., Suite 850, Rolling Meadows, IL 60008 • Tel. 1-866-9-OHMITE • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com
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