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Question
What is the notation and terminology for a Phototransistor output?
Answer
The following table provides a description of notation and terminology used in catalogs for Photomicrosensors built into equipment with a phototransistor output.
Phototransistor Output
| Notation | Item | Description |
| IFP | Pulse forward current | The maximum pulse current that is allowed to flow continuously from the anode to cathode of an LED under a specified temperature, a repetition period, and a pulse width condition. |
| Ic | Collector current | The current that flows to the collector junction of a phototransistor. |
| Pc | Collector dissipation | The maximum power that is consumed by the collector junction of a phototransistor. |
| ID | Dark current | The current leakage of the phototransistor when a specified bias voltage is imposed on the phototransistor so that the polarity of the collector is positive and that of the emitter is negative on condition that the illumination of the Photomicrosensor is 0 lx. |
| IL | Light current | The collector current of a phototransistor under a specified input current condition and at a specified bias voltage. |
| VCE(sat) | Collector-emitter saturated voltage | The ON-state voltage between the collector and emitter of a phototransistor under a specified bias current condition. |
| ILEAK | Leakage current | The collector current of a phototransistor under a specified input current condition and at a specified bias voltage when the phototransistor is not exposed to light. |
| tr | Rising time | The time required for the leading edge of an output waveform of a phototransistor to rise from 10% to 90% of its final value when a specified input current and bias condition is given to the phototransistor. |
| tf | Falling time | The time required for the trailing edge of an output waveform of a phototransistor to decrease from 90% to 10% of its final value when a specified input current and bias condition is given to the phototransistor. |
| VCEO | Collector-emitter voltage | The maximum positive voltage that can be applied to the collector of a phototransistor with the emitter at reference potential. |
| VECO | Emitter-collector voltage | The maximum positive voltage that can be applied to the emitter of a phototransistor with the collector at reference potential. |
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