Resistor Terms:
'A', 'B', 'C', 'D/E', 'F-L', 'M', 'N', 'O', 'P', 'R', 'S', 'T', 'V-Z'
Tab Mounted Resistor. A mounting method used by some high power resistors. The resistor uses tabs as opposed to leads or metal pads.
Tab Mounting Resistor
Tapped Resistor: A wire-wound, fixed resistor having one or more additional terminals along its length, generally for voltage-divider applications. Potentiometer Manufacturers
TCR: Temperature Coefficient of Resistance. TCR causes the value of the resistance to vary with change in temperature.
Temperature Coefficient: The magnitude of change in resistance due to temperature, usually expressed in percent per degree Celsius or parts per million per degree Celsius (ppm/C).
Termination Resistor: The resistor used to terminate [or match] a load to the incoming line impedance.
MIL-PRF-83401/9 Resistor Network, Fixed, Film, 10 Pin SIP
R1/R2 Resistor values are shown in the tables, below right.
How to calculate a termination resistor value
Parallel Termination Resistor Schematic, MIL-PRF-83401/9
Terminal: The leads of a through-hole resistor, or the end caps of an SMD resistor.
Thermal Noise: [Johnson Noise] The noise caused by the increase of current carries in a resistor due a thermal increase in the device.
Thermal Shock: A sudden change in temperature. Thermal Shock test; The resistors shall then be mounted on a rack of low-heat conducting material, and rated power shall be applied until thermal stability has been reached. The power shall then be removed and within 8 seconds to 12 seconds, the resistors shall be subjected to an air temperature of -55OC +0OC, -5OC for a period of not less than 15 minutes. Measurement of resistance shall be made not less than 2 hours after final exposure.
Thermistor: A resistor whose resistance varies with temperature in a defined manner. A device which produces a large change in resistance due to a change in body temperature. There are two types of Thermistors: PTC and NTC. Companies that Manufacture Thermistors, Thermistor Derating Graph
Thermistor Package
Thick Film Resistor: --- MIL-PRF-55342.
Thin Film Resistor: --- MIL-PRF-55342.
Time Constant: The Time constant is the time it would take for the potential difference across the capacitor [in an RC circuit] to increase to the same level as the applied voltage. The capacitance voltage rises at an exponential rate. The voltage over the capacitor also falls at the same rate. One Time constant [TC] equals R x C. Two TC's equals 2 x[RC], and so on.
RC Time Constant
Tolerance: A permissible deviation from a specified value. A maximum electrical or mechanical variation of specifications that can be tolerated without impairing the operation of a device. Definition of Resistor Tolerance
Trimmer: A variable resistor. Designed for less then frequent changes [occasional]~ a trim pot on a PCB to finalize a circuit resistance. A Trimmer may be Single Turn or Multiturn.
Trimmer, Trim Pot
