Check the listing for details. VTL5C3 Vactrol / Optocoupler. Condition: New. Listed at 2.99 USD. The VTL5C3 has a steep slope, high isolation, good dynamic range, low drive current, a very low temperature coefficient of resistance, and a small light history memory. It can be used in a wide range of products, and is ideal for use in audio limiting, compression, remote gain control and many other applications.We offer two types, an economy vactrol and high quality Xvive vactrol. Vactrols will always have a pretty low tolerance on their specifications, but the Xvive vactrols are a little more consistent. They are also sealed better so that outside light won't affect the LDR as easily.Specifications:On resistance: 30k @ 1mA5 ohm @ 10mA1.5 ohm @ 40mAOff resistance: 10M ohmSlope: 20 (typ)Dynamic Range: 75db (typ)Turn on: 2.5msTurn off: 35msPackage/Case: 4 pinLeadedPropagation Delay: 35uSVoltage Rating: 250VMounting Type: Through HoleNumber of Channels:1 Please note: The VTL5C3 will work in place of the NSL-7053 vactrol in products such as the DLY module, Roboto, etc. For the LPG, use the VTL5C4.