Automotive-grade isolation for signal and control
The Vishay VOMA617A-8X001T is a single-channel phototransistor optocoupler designed for automotive and industrial applications where galvanic isolation and reliability under harsh conditions are required. It carries AEC-Q101 qualification, making it suitable for under-hood and chassis-domain electronics, battery management systems, and motor drive feedback paths. Rated for 3750Vrms isolation, this part provides safe signal transfer between high-voltage and low-voltage domains, with a maximum output voltage of 80V and output current capability of 50mA per channel.
The current transfer ratio (CTR) is specified at 130% minimum and 260% maximum at a forward current of 5mA. This bin (the '-8' suffix) gives designers a predictable LED drive current range: at 5mA input, the output transistor can sink between 6.5mA and 13mA. That margin absorbs LED degradation over temperature and lifetime, important for automotive 15-year service targets. Typical turn-on time is 4.9µs and turn-off time is 3.3µs, with rise and fall times of 2.3µs and 3.2µs respectively. These are adequate for low-speed signal isolation — think status feedback, fault detection, or PWM gate drive at frequencies below 50 kHz. For faster switching, a logic-output optocoupler would be needed. Vce saturation is 400mV maximum, which keeps the output voltage drop low when the transistor is fully on — important for maintaining logic-level thresholds on the receiving side.
Package and mounting for production
Housed in a 4-SMD gull wing package (4-SOP supplier device package), it is a surface-mount component suited for automated assembly. The gull-wing leads provide good visual solder-joint inspection access. Reflow profile follows standard MSL guidelines — no special handling beyond normal moisture sensitivity precautions.
Lifecycle and supply continuity
For BOM planning: the AEC-Q101 qualification and Active status make this a low-risk choice for automotive and industrial designs that need a qualified, stable supply of phototransistor optocouplers.