Printable PDF version of datasheet
Advantages
Ohmcraft’s revolutionary fine line, thick film technology provides an entirely new level of performance and stability in chip resistors.
- Resistance Values to 50 Gigohms
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The usual hybrid technologies for manufacturing resistors depend upon composite materials that have limitations. Traditional thick-film methods severely limit performance characteristics and thin-film methods are limited in attainable ohmic values. The Ohmcraft method of manufacturing offers the best characteristics of both methods, plus adds many unique features. Ohmcraft resistors feature a longer, high-aspect ratio trace of lower resistivity film. The combination of long line, high-aspect ratio, and higher conductivity film, give Ohmcraft resistors unmatched design efficiency, versatility, linearity, stability and low noise. The Ohmcraft method allows control of process parameters to very tight tolerances. The result is chip resistors with outstanding stability and performance.
Low Noise Performance
Ohmcraft resistors exhibit exceptional noise characteristics. The graph on the right demonstrates the comparison of a resistor written by Ohmcraft, and an equivalent resistor printed using a standard thick-film process. The longer serpentine path which uses lower resistivity inks, and the smoother edges created by “writing” rather than “screening” combine to make one of the lowest noise generating resistors in the market.
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1 Other customer case sizes are available.
2 The continuous maximum voltage applied cannot exceed the maximum power rating.
Dimensions
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L = Length
W = Width
T = Thickness
D = Pad Dimension
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Custom configurations available: Ohmic values to 50 Gigohms, non-standard case sizes
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How to Order
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HC
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Type
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Case Size
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TCR
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Value
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Tolerance
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Termination
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Wire Bondable Chip
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See dimension table.
Custom case sizes are available.
Please consult factory.
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E
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±25ppm/°C
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H
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±50ppm/°C
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K
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±100ppm/°C
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L
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±200ppm/°C
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Resistance value expressed as a four digit number, where the first three numbers are the significant value, and the fourth number is the number of zeroes.
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D
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±0.5%
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F
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±1.0%
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G
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±2.0%
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J
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±5.0%
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K
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±10%
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L
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±20%
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G
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Wire bondable gold, Au, RoHS
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Typical Performance Characteristics
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Test
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Maximum ΔR
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Moisture Resistance
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0.1%
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Load Life
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0.1%
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Shock (pulse)
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0.1%
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Shock (thermal)
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0.1%
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Overload
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0.1%
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Low VCR
Low Voltage Coefficient of Resistance (VCR) minimizes the
voltage error associated with standard chip resistors
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Parameter
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Typical
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Insulation Resistance
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over 100 Gigohms, dry
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Dielectric Strength
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>1000 Volts
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Solderability
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≥ 95% Coverage
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Appropriate MIL STD specification are utilized as test methods.
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Comparison of Ohmcraft’s Fine Line Patterning & Conventional Thick Film Resistors
If given an equal area on a resistor substrate, and using the patterns specified in the layout on the left, the following parameter comparisons are made:
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Ohmcraft
Line Width: 4 mils
Space: 2 mils
Conventional Thick Film
Line Width: 22 mils
Space: 22 mils
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Ohmcraft
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Conventional
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Ohmcraft Advantage
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Resistance (ohms)
Aspect ratio (unit squares)
Sheet resistivity (ohms/sq)
Resistor Length (mils)
Electric field (volts/mil2)
Current density amps/mil2)
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R
80
p/40
188 mils
V/188
V/4
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R
2
p
33 mils
V/33
V/22
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Equal
40x Higher
40x Longer
5.7x Longer
5.7x Less
5.7x More
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Rated Power
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High Stability
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Rated power is the maximum value of power (watts), which can be continuously applied to a resistor at a rated ambient temperature. The basic mathematical relationships are:
Power = I2 * R = V2/R = I * V
If the circuit designs permits, the choice of a higher ohmic value resistor will minimize the power level and improve the resistor’s performance because it is operating at a lower power and temperature level.
Custom Configurations Available Upon Request
Please consult with our knowledgeable sales staff for help specifying custom parts to meet your needs.
Printable PDF version of datasheet
rev. 1639
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Ohmcraft’s resistors feature low noise, and high stability at high ohmic values due to their high square count and associated design characteristics.
Power Derating Curve
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