5.3 kV isolation in a 4-SMD gull wing
The SFH610A-3X007T: That isolation rating suits it for galvanic separation in power supplies, motor drives, and industrial I/O where the primary and secondary sides must be electrically isolated to protect low-voltage logic from high-voltage transients. The current transfer ratio (CTR) is binned at 100% to 200% at a forward current of 10 mA, which means the output transistor can sink at least as much current as the LED drives. This CTR range is typical for general-purpose optocouplers used in logic-level signal transmission, where the 10 mA drive is available from a standard microcontroller GPIO or a logic gate output.
Switching speed and output drive
Typical rise and fall times are 2 µs each, with turn-on and turn-off times of 3 µs and 2.3 µs respectively. This places the SFH610A-3X007T in the medium-speed class — adequate for 10-100 kHz switching in feedback loops, status signalling, and isolated serial interfaces like RS-232 or simple I²C level shifting. The output transistor can handle up to 70 V collector-emitter and 50 mA continuous current per channel, with a saturation voltage of 400 mV max at the rated current. The 70 V ceiling means it can interface with 24 V industrial logic rails and 48 V telecom supplies without an external level translator.
Package and temperature grade
The gull-wing leads provide a visual solder-joint inspection point and good thermal cycling reliability compared to leadless packages. The 100°C upper limit is the junction temperature of the phototransistor; in a 70°C ambient with moderate self-heating, the device stays well within its derating curve.