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Optoisolators offer 1kV isolation in TX, TXV, COTS

Posted: 03 Sep 2010 ?? ?Print Version ?Bookmark and Share

Keywords:optoisolators? TX? TXV? COTS?

TT electronics, OPTEK Technology has developed a series of high-reliability, optically coupled isolators that provide up to 1kV electrical isolation with a high current transfer ratio. These isolators providing military electronics design engineers with the ability to optically isolate sensitive circuit elements. Designated the 4N2x and 4N4x Series, the optically coupled isolators come in hermetically sealed metal packages, either surface mount 6-pin leadless chip carriers, or through-hole TO-78 metal cans, which are processed to TX and TXV MIL-PRF-19500/486 and /548 specifications. COTS-level devices are also available.

Outlining the ruggedness and quality of these products, VP of optoelectronic components for OPTEK Technology, Rodney Bailey says, "They are ideal for any high reliability circuit requiring high voltage isolation between input and output, especially in harsh environments."

The optically coupled isolators are made of a 935nm (4N2x Series) or an 890nm (4N4x Series) wavelength infrared-emitting diode and a NPN silicon photo-transistor mounted in a hermetically sealed metal package, with a base contact provided for conventional transistor biasing. These devices are also available with the collector pin electrically isolated from the case.

The devices within the 4N2X Series all exhibit input diode forward current (IF) of 40mA (max), 10mA (typical); collector-emitter voltage (VCE) is rated at 35V (max); with 1kVDC voltage isolation. Their operating temperature range is from -65 degree C to +125 degrees C. To enumerate: 4N22 Series devices feature a minimum current transfer ratio (CTR) of 25 percent ; 4N23 Series = minimum CTR of 60 percent; 4N24 Series devices = minimum CTR of 100 percent .

Meanwhile, the devices within the 4N4x Series all exhibit input diode forward current (IF) of 40mA (max); collector-emitter voltage (VCE) is rated at 40V or 45V (max), depending on package style; with 1kVDC voltage isolation. Their operating temperature range is from -55?C to +125?C. To enumerate: 4N47 Series devices feature (CTR) of 50 percent; 4N48 Series = minimum CTR of 100 percent; N49 Series = minimum CTR of 200 percent .

The 4N2x Series (TX, TXV) devices are processed to MIL-PRF-19500/486 standards; and the 4N4x Series (TX, TXV) are processed to MIL-PRF-19500/548 standards. Burn-in condition for all devices is as follows: VCE = 10V, IF = 40mA, PD = 275mW, TA = 25?C.

Packaging options for the 4Nxx Series optically-coupled isolators is a choice between a standard TO-78 metal can through-hole package, or a surface mount leadless chip carrier (designated with a "U" suffix to the part number). Both package types are hermetically sealed and compatible with high temperature soldering processes.

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