RES-TAH Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Frequency Conversion

TAH Series
20 Watt TO220 Package
Thick Film Power
The TAH20 is a completely encapsulated
thick film resistor in the TO220 package
outline. Rated for 20 watts @ 25°C case
temperature, these resistors are elec-
trically isolated, and molded in a high
temperature 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 has very low inductance,
and available in a wide range of resis-
tance values in standard 5% tolerance.
1% tolerance available by special order.
F e at u r e s
• 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 @ RTH<6.25°C/W
• Tube Packaging Available
A p p l i c at i o n s
• Frequency Conversion
• High Frequency Balancing
• Snubbers
characteristics
Resistance Range 0.05Ω to 10KΩ, other values available upon
request
Tolerance <0.1Ω: 5% only
0.1Ω-1MΩ: 5% std.; 1% available
Temperature Referenced to 25°C, ∆R taken at +105°C;
Coefficient 1 to 10Ω: ±(100ppm+0.002Ω)/°C
10Ω & up: ±50ppm/°C
Max Operating 350V
Voltage
Dielectric Strength 1,800 VAC
Power Rating 20W @ 25°C case temperature; see derating
curve, below
Insulation Resistance 10GΩ min.
Momentary Overload 2x rated power for 5 seconds where applied
voltage ≤1.5 times max. operating voltage.
∆R ±(0.3% + 0.001Ω) max.
Case Material KMC-125 epoxy
Terminal Material Copper
Terminal Plating Lead Free Solder (97% Tin, 3% Silver)
Mounting Requires the use of a snap-on style heat
sink. A thermal compound should be properly
applied.
Solder Process The TAH20 cannot exceed 260°C for more
than 10 seconds during soldering process.
Load Life MIL-R-39009, 2000 Hours
@ Rated Pwr
Thermal Shock MIL-R-STD-202, Method
107, Cond. F
High Freq MIL-R-STD-202, Method
Vibration 204, Cond. D
Terminal Strength MIL-R-STD-202, Method
211, Cond. A (Pull Test)
2.4N
Moisture MIL-R-STD-202, Method
Resistance 106
Derating
100
80
60
40
20
0
0
TCH
TAH
25
50
75
100
125
Bottom of base plate Temperature, °C
∆R = ±(1.0%
+ 0.001) Ω
∆R = ±(0.3%
+ 0.001) Ω max
∆R = ±(0.2%
+ 0.001) Ω max
∆R = ±(0.2%
+ 0.001) Ω max
∆R = ±(0.5%
+ 0.01) Ω max
TAH/TCH
20/35
16/28
12/21
8/14
4/ 7
0
150
175
1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax [phone] • www.ohmite.com • [e-mail]
145
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