specifications subject to change without notice. please check our website for latest information. smt current sensors C cst series document 385-1 document 385-1 revised 10/21/04 primary terminating volt-time part number 1 turns ratio inductance 2 dcr max (ohms) current 3 resistor 4 product 5 color cst1 cst2 pri : sec min (h) primary secondary (a) (ohms) (v-sec) dot cst1-020x_ cst2-020x_ 1 : 20 81.0 0.006 0.400 10 2.0 16 red cst1-030x_ cst2-030x_ 1 : 30 180.0 0.006 0.870 10 3.0 24 orange cst1-040x_ cst2-040x_ 1 : 40 320.0 0.006 1.140 10 4.0 32 yellow cst1-050x_ cst2-050x_ 1 : 50 500.0 0.006 1.500 10 5.0 41 green cst1-060x_ cst2-060x_ 1 : 60 730.0 0.006 1.980 10 6.0 49 blue cst1-070x_ cst2-070x_ 1 : 70 980.0 0.006 4.750 10 7.0 57 violet cst1-100x_ cst2-100x_ 1 : 100 2000.0 0.006 5.500 10 10.0 81 gray cst1-125x_ cst2-125x_ 1 : 125 3000.0 0.006 6.500 10 12.5 101 black 8 sec (n turns) pri (1 turn) 7 6 4 terminating resistor (r ) t v ref current i pri the cst surface mount current sens ing transformers are designed for use from 50 khz to nearly 1 mhz to sense continuous currents to 10 amps and greater. the cst1 and cst2 differ in pinout numbering and layout in order to meet the requirements of different applications. these transformers feature very low dc resistance and 500 v isolation between windings. they are available in eight different turns ratios to meet a wide variety of requirements. they are ideal for use in switching power supply applications. coilcraft designer?s kit c189 contains samples of each of the standard parts shown. to order, contact coilcraft or visit http://order.coilcraft.com . 1. when ordering, please specify packaging code: cstx-125x c packaging: c =7 machine-ready reel. eia-481 embossed plastic tape (250 parts per full reel). b = less than full reel. in tape, but not machine ready. to have a leader and trailer added ($25 charge), use code letter c instead. d =13 machine-ready reel. eia-481 embossed plastic tape (1000 parts per full reel). 2. inductance measured between secondary pins at 100 khz, 0.1 vrms. 3. primary current of 10 a causes approximately 25c temperature rise above 25c ambient. higher current causes a greater tempera- ture rise (see temperature rise vs current curve). 4. terminating resistor value is based on 1 volt output with 10 amps flowing through the primary. to determine the value for other input currents, refer to the schematic and use the following formula: r t ( ) = v ref * n sec / i pri. 5. volt-time product is a maximum value for the secondary. 6. storage and operating temperature range -40c to +85c. 7. electrical specifications at 25c. schematics cst1 8 sec (n turns) pri (1 turn) 7 1 3 terminating resistor (r ) t v ref current i pri cst2
cst series current sensors specifications subject to change without notice. please check our website for latest information. 0.079 0.008 2,0 0,2 0.073 0.008 1,85 0,2 0.023 0.008 0,6 0,2 0.320 8,13 color dot by pin 1 indicates part number max 0.004 / 0,10 0.047 1,2 0.118 3,0 0.051 1,3 0.051 1,3 0.063 1,6 0.098 2,5 0.106 2,7 0.073 1,85 recommended land pattern 0.315 8,0 0.230 5,84 0.240 6,10 0.209 5,3 max max dimensions document 385-2 document 385-2 revised 01/12/05 tape and reel: 250/7 reel; 1000/13 reel 16 mm tape width for packaging data see tape and reel specifications section. 80 70 60 50 40 30 20 0 10 temperature rise (from 25c) current (a rms) 4 2 08 612 10 16 18 14 20 temperature rise vs current pinouts 8 7 3 4 1 6 7 8 3 4 1 6 cst1 bottom view bottom view cst2
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