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Digital isolator flaunts 10kV surge protection

Posted: 04 Nov 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Silicon Labs? digital isolator? electric vehicle? base station? power supplies?

Silicon Labs has announced a line-up of multi-channel digital isolators boasting a high-voltage isolation barrier geared to withstand 10kV surge hits. Based on the company's proprietary capacitive isolation technology, the Si86xxxT devices offer robust protection against secondary lightning strikes and enhances system reliability in various industrial applications, stated Silicon Labs.

The Si86xxxT digital isolator family claims to deliver the industry's fastest, most accurate timing specifications, highest noise immunity and reliability, lowest electromagnetic noise emissions and longest lifetimes under high-voltage conditions. The Si86xxxT digital isolators are intended for applications that must withstand a 10kV hit such as microinverters, base station power supplies, process manufacturing equipment, motor controls and drives, industrial uninterruptible power supplies, metering equipment and battery management systems for electric vehicles.

Developers of industrial applications expect reinforced isolation products to provide fail-safe protection from secondary lightning strikes, especially in applications where equipment is installed outdoors and where exposed cables or wires are vulnerable to lightning. In addition, industrial equipment developers also demand isolation products with fast timing, high noise immunity, long lifetimes at high voltages, and a wide VDD and temperature range. These specifications help developers enhance the efficiency, effectiveness and safety of their system designs. The Si86xxxT family provides a best-in-class 10kV isolation solution by satisfying all of these design requirements.

The Si86xxxT family includes a range of dual- to quad-channel devices in wide-body packages to accommodate diverse application needs with higher isolation ratings. Pin-compatible with existing digital isolators from Silicon Labs and other isolation suppliers, the Si86xxxT family offers substantial data rate, propagation delay, power, size, reliability and external bill of materials (BOM) advantages over legacy isolation technologies, the company stated.

The operating parameters of Si86xxxT digital isolators remain stable across wide temperature ranges and throughout the device service life for ease of design and highly uniform performance. The 10kV surge capability qualifies Si86xxxT isolators as "Reinforced VDE" components, a standard of high importance for many industrial, telecom and automotive applications. Long lifetimes are particularly important to meet typical product lifetime for industrial uses.

All Si86xxxT digital isolators have Schmitt trigger inputs for high noise immunity, and these highly integrated devices only require VDD bypass capacitors, reducing BOM cost and complexity. The Si86xxxT devices support data rates up to 150Mb/s with propagation delays of 10ns. Enable inputs provide a single point of control for enabling and disabling the output drive.

The Si86xxxT digital isolator family boasts accurate timing specs with low skew (1ns); noise immunity (CMTI) of 100kV/?s and low electromagnetic noise emissions (20dB lower than competing digital isolators); long lifetimes under high-voltage conditions (100 years at 1kV); low-power isolation solution with 1.8mA maximum power per channel at 10Mb/s; and flexible ordering options: multiple channels, package configurations and a selectable fail-safe operating mode to control the default output state during power loss

Samples and production quantities of the Si86xxxT digital isolators are available in a variety of compact wide-body packages. Pricing in 10,000-unit quantities begins at $1.52 for a two-channel Si862xxT device; $2.17 for a three-channel Si863xxT device; and $2.93 for a four-channel Si864xxT device. The Si86xxTISO-KIT evaluation kit, priced at $29, is available to help developers evaluate and implement 10kV isolation barriers in their applications.

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