New hybrid solid-state relays can reliably replace mechanical types

The first three devices in its new 1 Form A VOR family of hybrid solid-state relays have been introduced by Vishay. They are designed to deliver high reliability and noiseless switching for telecommunications, industrial, security system, and metering applications. As replacements for traditional mechanical relays with lower reliability and shorter lifetimes, the new VOR1142A6, VOR1142B6, and VOR1142M4 provide high input-to-output isolation, current limit protection, and low power consumption. The relays are normally-open single-pole, single-throw (SPST) switches. Allowing for simple customization, the devices feature a modular construction consisting of a GaAIAs (gallium aluminium arsenide) IRED actuation control and MOSFETs for the switch output. The single-channel relays are offered in DIP-6 (VOR1142A6), SMD-6 (VOR1142B6), and SOP-4 (VOR1142M4) packages. Devices in the SMD-6 and DIP-6 packages offer a high isolation test voltage of 5300 V/1 min, while devices in the smaller SOP-4 offer an isolation test voltage of 3750 V/1 min. All relays offer low typical on-resistance of 22ohm, high load current of 140mA, load voltage of 400V, and very low turn-on current of 0.25mA typical. The devices are VDE-and UL-certified to meet reinforced insulation requirements for most applications. Electronically isolated, the VOR1142A6, VOR1142B6, and VOR1142M4 offer clean, bounce-free switching over an ambient temperature range of -40C to +100C. Typical applications include line, load, ground, signal, and alarm switches; I/O cards; ground isolation; electro-mechanical noise isolation; automation; automatic test equipment; and motor drives. Available in tape-and-reel and tube packing, the devices are RoHS-compliant and halogen-free, says the company.