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The FOD2742 Optically Isolated Amplifier consists of the popular KA431 precision programmable shunt reference and an optocoupler. The optocoupler is a gallium arsenide (GaAs) light emitting diode optically coupled to a silicon phototransistor. It comes in 3 grades of reference voltage tolerance = 2%, 1%, and 0.5%.
The Current Transfer Ratio (CTR) ranges from 100% to 200%. It also has an outstanding temperature coefficient of 50 ppm/°C. It is primarily intended for use as the error amplifier/reference voltage/optocoupler function in isolated ac to dc power supplies and dc/dc converters.
When using the FOD2742, power supply designers can reduce the component count and save space in tightly packaged designs. The tight tolerance reference eliminates the need for adjustments in many applications. The device comes in a 8-pin small outline package.
FOD2742A Maximum Ratings
Product
Product status
Eco Status
Pricing*
Package type
Leads
Packing method
Package Drawing
FOD2742A
Full Production
RoHS Compliant
$0.471
SOIC
8
BOX
TBD
FOD2742AR1
Lifetime Buy
RoHS Compliant
N/A
SOIC
8
TAPE REEL
TBD
FOD2742AR1V
Lifetime Buy
RoHS Compliant
N/A
SOIC
8
TAPE REEL
TBD
FOD2742AR2
Full Production
RoHS Compliant
$0.50
SOIC
8
TAPE REEL
TBD
FOD2742AR2V
Full Production
RoHS Compliant
$0.50
SOIC
8
TAPE REEL
TBD
FOD2742AV
Full Production
RoHS Compliant
$0.471
SOIC
8
BOX
TBD
* Fairchild 1,000 piece Budgetary Pricing
** A sample button will appear if the part is available through Fairchild's on-line samples program. If there is no sample button, please contact a Fairchild distributor to obtain samples
FOD2742A Features
Optocoupler, precision reference and error amplifier in single package 2.5V reference CTR 100% to 200% 2,500V RMS isolation UL approval E90700, Volume 2 BSI approval 8661, 8662 VDE approval 136616 CSA approval 1113643 Low temperature coefficient 50 ppm/°C max FOD2742A: tolerance 0.5% FOD2742B: tolerance 1% FOD2742C: tolerance 2%