5300Vrms isolation in a rework-friendly package
The SFH6106-4X001T is a Vishay 1-channel phototransistor optocoupler with a 5300Vrms isolation rating — enough to separate a 400VAC motor-drive control signal from the low-voltage logic side without a separate isolation barrier IC. The 4-SMD Gull Wing package (supplier device package 4-SMD) is a standard footprint that reflows cleanly under a hot-air station — the gull-wing leads are visible for inspection and touch-up, unlike a BGA or QFN where the joint hides under the body.
CTR and switching speed — what they mean for the BOM
Current transfer ratio spans 160% to 320% at 10mA forward current — this wide bin means the output transistor can saturate a logic input with as little as 3mA on the LED side, giving headroom for degraded LED output over temperature or lifetime. Typical turn-on time is 3µs and turn-off 2.3µs, with rise/fall times of 2µs each — fast enough for 100kHz PWM feedback or serial data isolation at 115kbps, but not for high-speed CAN or Ethernet isolation where a digital isolator would be needed. Maximum Vce saturation of 400mV at the output transistor means the logic-side pull-up resistor sees a clean low-level voltage — the downstream gate or microcontroller input stays below its VIL threshold without an extra level-shift stage.
Temperature range and deployment context
Operating temperature spans -55°C to 100°C — the full industrial band covers outdoor telecom cabinets, motor-drive enclosures, and automotive auxiliary circuits that see under-hood ambient without active cooling. Maximum DC forward current of 60mA on the input LED and 50mA per channel on the output transistor — the output current limit is the binding constraint when driving a relay coil or a logic input with a weak pull-up. Maximum output voltage of 70V means the transistor can switch a 24V or 48V industrial bus rail directly — no external level translator needed between the optocoupler and the PLC input module.