These are used extensively in audio compressors, audio level controls, limiters, expanders, noise gates, tremolo effects, guitar amplifiers etc. 400R ON resistance.
Xvive VTL5C10 Optocoupler. Package/Case: 4 pin, Leaded. This offers a low on resistance at low drive currents, a fast response time, and has a smaller temperature coefficient than the VTL5C9.
Xvive VTL5C3/2 Optocoupler. Package/Case: 5 pin, Leaded. Propagation Delay: 150uS. Voltage Rating: 50V. Mounting Type: Through Hole. Number of Channels:2. The VTL5C3/2 is a dual element Axial Vactrol with steep slope, good dynamic range, a very low temperature coefficient of resistance and a small light history memory.
Xvive VTL5C4/2 Optocoupler. Package/Case: 5 pin, Leaded.Propagation Delay: 6uS. Voltage Rating: 30V. Mounting Type: Through Hole. Number of Channels: 2. The VTL5C4/2 features a very low on resistance, fast response time, with a smaller temperature coefficient of resistance than VTL5C1.
Macron MI1210CLE-R is similar to VTL5C1. 1,0-2,0K, Off resistance > 50 Megohms. Will also work as a substitute for VTL5C9 if you give it more drive current. May be used as substitute fot VTL5C6 with minimal trimming of other components.
The Opto-switcher module pre-soldered assembly can be used or any application where you need a 6v directly driven photocell based optocoupler. This can be used as a 6v version of the Fender style optoisolator and uses the same photocell.
Original NOS Vactrol Optocoupler. Package/Case: 4 pin, Leaded. Propagation Delay: 35uS. Voltage Rating: 100V. Mounting Type: Through Hole. Number of Channels: 1.