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Isolated Voltage Threshold Resistor Calculator

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Isolated Voltage Threshold Resistor

Example datasheet values

What to detect

Input type

Switch-on level (V)

Maximum input (V)

Voltage rating per resistor (V)

Detector thresholds (min / typ / max)

VTH+ min (V)

VTH+ typ (V)

VTH+ max (V)

VTH− min (V)

VTH− typ (V)

VTH− max (V)

ITH+ min (mA)

ITH+ typ (mA)

ITH+ max (mA)

ITH− min (mA)

ITH− typ (mA)

ITH− max (mA)

Readout

SERIES RESISTOR RX (E96)

—

SWITCH-ON LEVEL, MIN – MAX OVER TEMPERATURE

—V

SWITCH-OFF LEVEL, MIN – MAX

—V

CHECKS

—

Single-resistor method from the detector datasheet: V+ = VTH+ + ITH+ × RX. If the switch-on window is too wide for your application, the datasheet's two-resistor method (RX plus a parallel RP) sets both levels more tightly.