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The PS2561AL2-1-Q-A is a single-element transistor output optocoupler manufactured by CEL. It integrates a GaAs infrared emitting diode and an NPN silicon phototransistor within a lead-free, surface-mount plastic package with four pins (L2 type). The device provides a high isolation voltage of 5000 Vrms between input and output circuits. Key electrical parameters include a minimum collector-emitter breakdown voltage of 70 V, a maximum forward current of 30 mA, and a maximum dark current of 100 nA. It operates within a temperature range of -55 °C to 100 °C.
Verify the specific suffix Q-A against official manufacturer documentation to confirm qualification status and exact pinout compatibility. Ensure the ordering number matches the required tape and reel specifications if applicable. Cross-reference the UL recognition number E72422 for safety compliance in end-use equipment. Confirm that the L2 package dimensions align with the target PCB footprint design constraints.
Select this component when a single-channel transistor output isolator with high voltage withstand capability is required. The L2 package variant is suitable for surface mount technology processes. Consider the 5000 Vrms isolation rating for applications involving hazardous line voltages or significant potential differences between circuit grounds. Verify that the 70 V collector-emitter breakdown voltage meets the load requirements of the receiving side circuitry.
This part belongs to the PS2561A series of photocouplers, which are designed for cost-effective isolation solutions. The series includes DIP and various surface mount packages. The AL2 designation specifically indicates the wide lead bending L2 type optimized for surface mounting. These devices utilize a GaAs LED and silicon phototransistor to achieve reliable optical coupling.
Direct substitutes include PS2561AL2-1-E3-A and PS2561AL2-1-E4-A from the same family. Verify pin compatibility and isolation ratings before substitution. Other manufacturers may offer equivalent transistor output optocouplers with similar 5000 Vrms isolation but different package footprints.