Isolation and transfer ratio — the two numbers that decide the BOM fit
The MOC8102 is a 1-channel optocoupler with a transistor output, rated for 5300Vrms isolation between input and output — this is the figure that governs safety spacing in a power-supply feedback loop or a PLC digital input where the field side must be galvanically separated from the controller side.
Switching speed and output drive
Rise and fall times are 2µs typical each, with turn-on time of 3µs and turn-off time of 2.3µs — the output transistor switches at a rate that suits 10-100 kHz isolated communication links or PWM gate drive signals, but not high-speed serial buses above 1 Mbps. Maximum output voltage is 30V and continuous output current per channel is 50mA — the transistor can drive a small relay coil, an LED indicator, or a logic-level input directly, but needs an external driver for higher-current loads. Forward voltage is 1.25V typical at 10mA, and the absolute maximum forward current is 60mA — the LED side runs from a standard 3.3V or 5V logic rail with a series resistor sized to keep the drive within the 73-117% CTR window.
Package, temperature, and compliance
Housed in a 6-DIP through-hole package with 0.300-inch (7.62mm) body width — the standard DIP footprint that hand-assembly and wave-solder lines handle without special tooling; the supplier device package is listed as 6-DIP. Lifecycle status is active and the part is ROHS3 compliant — no last-time-buy pressure for existing designs, and the lead-free finish matches current assembly requirements.