Datasheet

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152
TRH Series
Thick Film
CHARACTERISTICS PERFORMANCE
SPECIFICATIONS
(continued)
Resistance Range
5Ω to 10 MegΩ, based
on type
Tolerance
1%, 5%, 10%
Power Rating*
30W based on 25°C free
air
Maximum
Operating Volts
15 KV, not to exceed
power rating
Temp Coeff.
Resistance*
≤10Ω: ±400ppm
>10Ω-100MΩ: ±100ppm
TCR Temperature
Range
-55°C to +125°C
Derating
100% @25°C to 0%
@180°C ambient
Substrate
95% Alumina
Resistor
Thick Film Composition
Terminals
Solder Plated Phosphor
Bronze
Operating Temp.
Range
-55°C to +180°C
Coating
Glass or Silicone
Solder
Sn95.5Ag3.0Cu0.5
(SAC305)
*Consult factory for optional power ratings and TCR ranges
Humidity
Mil-Std-202, Method 103B, Condition B ΔR ±0.25%+0.05Ω
Insulation
Resistance
Mil-Std-202, Method 302, Condition B >10,000M or greater Dry
Thermal Shock
Mil-Std-202, Method 107G, Condition B ΔR ±0.20%+0.05Ω
Load Life
Mil-Std-202, Method 108A, Condition
D, 70°C; rated power 90min ON, 30 min
Off, 1000 hrs
ΔR ±1%+0.05Ω
Terminal
Strength
Mil-Std-202, Method 211A, Condition A ΔR ±0.25%+0.05Ω
Shock (Specified
Pulse)
Mil-Std-202, Method 213B, Condition I 100Ω: ΔR ±0.5%+ 0.05Ω
<100Ω: ΔR ±1%+ 0.05Ω
Vibration, High
Frequency
Mil-Std-202, Method 204D, Condition D 100Ω ΔR ±0.5%+ 0.05Ω
<100Ω ΔR ±1%+ 0.05Ω
Solderability
Mil-Std-202, Method 208F >95% Coverage
Short Term
Overload
2.5x rated power, 5 sec, not exceeding
max voltage
ΔR ±0.25%+0.05Ω
Soldering to
Heat
350°C solderpot, 3 sec ΔR ±0.25%+0.05Ω
Dielectric
Withstanding
Voltage
Mil-Std-202, Method 301, 5KVDC thru
back side
ΔR ± 0.25%+ 0.05Ω
Insulation
Resistance
Mil-Std-202, Method302, Condition B >10,000M or greater Dry
Resistance to
Solvents
Mil-Std-202, Method 215G No Degradation of
Coating or Marking
Surge Immunity
(energy type only)
IEC61000-4-5 waveform
1.2μsec/50μsec, 10 pulses applied. up
to 4.5KVD, 100 ohm and up
ΔR less than 1% from
initial value
The Ohmite TRH combines two products in one.
Ohmite uses advanced thick film printing processes
to place a resistor onto an ceramic heatsink. The
TRH series replaces common thick film heatsinkable
products and the heatsink and hardware associ-
ated with them. The resistor and heatsink are one
unit and work together with great thermal efficiency.
The TRH series is designed to be board mounted
and comes in three different application designs.
Special resistance patterns have been designed for
Continuous Power, High Voltage and Surge applica-
tions.
Series Type Resistance Range
TRHP Continuous Power 100Ω to 10KΩ
TRHE Impulse Energy 5Ω to 1KΩ
TRHV High Voltage 100KΩ to 100MΩ
FEATURES
• High-Temp Terminal Construction
• Wide Resistance Range
• Low Inductance (50nH-100nH)
• Easy to install. PC-mountable
• Meets Mil-Std-202
• Meets IEC 61000-4-5