specifcations subject to change without notice. please check our website for latest information. 0603 chip inductors document st773-1 revised 10/28/11 core material ferrite terminations matte tin over nickel over silver-platinum-glass frit. weight 4.3 C 5.7 mg ambient temperature C40c to +85c with i rms current, +85c to +100c with derated current storage temperature component: C55c to +100c. packaging: C55c to +80c resistance to soldering heat max three 40 second refows at +260c, parts cooled to room temperature between cycles temperature coeffcient of inductance (tcl) +50 to +300 ppm/c moisture sensitivity level (msl) 1 (unlimited foor life at <30c / 85% relative humidity) packaging 2000 per 7 reel; paper tape: 8 mm wide, 1.0 mm thick, 4 mm pocket spacing inductance 2 impedance typ (ohms) srf min 4 dcr max 5 i max color part number 1 5% (nh) q min 3 100 mhz 500 mhz (mhz) (ohms) (a) code st312ram15njrz 15 @ 7.9 mhz 10@ 7.9 mhz 10 42 2800 0.023 1.7 yellow st312ram33njrz 33 @ 7.9 mhz 10@ 7.9 mhz 19 90 1840 0.028 1.7 red st312ram111jrz 110 @ 7.9 mhz 12 @ 7.9 mhz 70 350 980 0.060 1.4 red st312ram121jrz 120 @ 7.9 mhz 12 @ 7.9 mhz 76 410 920 0.089 1.4 black st312ram241jrz 240 @ 7.9 mhz 12 @ 7.9 mhz 140 810 720 0.12 0.68 violet ST312RAM271JRZ 270 @ 7.9 mhz 12 @ 7.9 mhz 173 1023 600 0.22 0.68 brown st312ram471jrz 470 @ 7.9 mhz 12 @ 7.9 mhz 306 2253 460 0.37 0.61 orange st312ram561jrz 560 @ 7.9 mhz 12 @ 7.9 mhz 371 3180 400 0.49 0.53 blue st312ram681jrz 680 @ 7.9 mhz 12 @ 7.9 mhz 420 3620 420 0.46 0.53 orange st312ram821jrz 820 @ 7.9 mhz 12 @ 7.9 mhz 507 3300 260 0.58 0.53 green st312ram102jrz 1000 @ 7.9 mhz 13 @ 7.9 mhz 663 9823 320 0.84 0.40 black st312ram222jrz 2200 @ 7.9 mhz 12 @ 2.5 mhz 5220 129 65 1.10 0.40 red st312ram472jrz 4700 @ 7.9 mhz 12 @ 7.9 mhz 2100 220 45 1.50 0.40 yellow st312ram103jrz 10000 @ 2.5 mhz 9 @ 2.5 mhz 1400 150 30 4.50 0.40 gray higher inductance values than ceramic 0603 inductors heavier gauge wire for low dcr ferrite construction for high current handling inductance values from 15 nh to 10 h 1. when ordering, please specify termination and testing codes: st312ram103j rz termination: r = rohs compliant matte tin over nickel over silver- platinum-glass frit. special order: q = rohs tin-silver-copper (95.5/4/0.5) over tin over nickel over silver-platinum-glass frit or p = non-rohs tin-lead (63/37) over tin over nickel over silver-platinum-glass frit. testing: z = cots h = screening per coilcraft cp-sa-10001 2. inductance measured using a coilcraft smd-a fxture in an agilent/ hp 4286a impedance analyzer or equivalent with coilcraft-provided correlation pieces. 3. q measured at the same frequency as inductance using an agilent/ hp 4291a with an agilent/hp 16197a test fxture or equivalents. 4. srf measured using an agilent/hp 8753es network analyzer or equivalent and a coilcraft smd-d test fxture. 5. dcr measured on a keithley 580 micro-ohmmeter or equivalent and a coilcraft ccf1010 test fxture. 6. electrical specifcations at 25c. refer to doc 362 soldering surface mount components before soldering. chip inductors for critical applications st312ram 1102 silv er lak e road car y il 60013 phone fa x 800-981-0363 847-639-1508 e-mail we b cps@coilcraft.com www .coilcraft-cps .com ? ? coilcraft, inc. 2012
specifcations subject to change without notice. please check our website for latest information. 0603 chip inductors document st733-2 revised 10/28/11 st312ram series (0603) typical q vs frequency current derating typical l vs frequency typical impedance vs frequency -40 -20 02 04 06 08 0 100 120 ambient temperature (c) 120 110 100 90 80 70 60 50 40 30 20 10 0 pe r cent of rated rms i 25c a b c d max max max ref e f g h i j 0.071 0.044 0.036 0.015 0.030 0.013 0.034 0.040 0.025 0.025 inches 1,80 1,12 0,91 0,38 0,76 0,33 0,86 1,02 0,64 0,64 mm 100 1000 10000 11 0 1000 100 frequenc y (mhz) inductance (nh) 1000 nh 470 nh 270 nh 120 nh 680 nh 2200 nh 4700 nh 560 nh 11 0 100 1000 0 20 18 16 14 12 10 8 6 4 2 22 q f actor frequency (mhz ) 1000 nh 560 nh 470 nh 270 nh 120 nh 680 nh 2200 nh 4700 nh 1 10 100 1000 100000 10000 impedance (ohms) 100 10 1 1000 10000 frequenc y (mhz) 1000 nh 560 nh 680 nh 2200 nh 4700 nh 470 nh 270 nh 120 nh a b ov erall c pic k and place mater ial d te r minal wraparound: appro x 0.008/0,20 both ends i i j f f g h e ter minal recommended land p attern suggested land pattern note: dimensions are before optional solder application. for maximum overall dimensions including solder, add 0.0025 in / 0,064 mm to b and 0.006 in / 0,15 mm to a and c . 1102 silv er lak e road car y il 60013 phone fa x 800-981-0363 847-639-1508 e-mail we b cps@coilcraft.com www .coilcraft-cps .com ? ? coilcraft, inc. 2012
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