In a 4-pin DIP or SOP package, “9892” often corresponds to a phototransistor output optocoupler with a CTR (Current Transfer Ratio) of 50-200%. You will see this in isolated power supplies or microcontroller input protection circuits.
| Parameter | Conditions | Min | Typ | Max | Unit | | :--- | :--- | :--- | :--- | :--- | :--- | | CTR (Current Transfer Ratio) | If=5mA, Vce=5V | 50 | 100 | 200 | % | my 9892 datasheet
Meaning: If you drive the LED with 5mA, the output transistor will sink 2.5mA to 10mA (50-200% of 5mA). Design your pull-up resistor accordingly. In a 4-pin DIP or SOP package, “9892”
Based on the official datasheet for the 9892 optocoupler, here is the standard application circuit for isolating a 24V industrial PLC input from a 5V microcontroller. Based on the official datasheet for the 9892
Part Number: TDA9892 (and variants like TDA9895) Manufacturer: NXP Semiconductors (formerly Philips) Category: Sound Processor / TV Audio Decoder