®
© Coilcraft, Inc. 2013
1102 Silver Lake Road
Cary, IL 60013
Phone 800-981-0363
Fax 847-639-1508
Email cps@coilcraft.com
www.coilcraft-cps.com
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specifications subject to change without notice.
Please check our web site for latest information.
Chip Inductors for Critical Applications ST312RAA
0603 CHIP INDUCTORS
Document ST195-1 Revised 06/12/13
Small size, exceptional Q and high SRFs make these
inductors ideal for high frequency applications where
size is at a premium. They also have excellent DCR and
current carrying characteristics.
Typical L vs Frequency
Typical Q vs Frequency
A B C D
max max max ref E F G H I J
0.071 0.044 0.040 0.015 0.030 0.013 0.034 0.040 0.025 0.025
1,80 1,12 1,02 0,38 0,76 0,33 0,86 1,02 0,64 0,64
Current Derating
Core material Ceramic
Terminations Silver-palladium-platinum-glass frit. Other termina-
tions available at additional cost.
Ambient temperature –40°C to +125°C with Imax current, +125°C
to +140°C with derated current
Storage temperature Component: –55°C to +140°C.
Tape and reel packaging: –55°C to +80°C
Resistance to soldering heat Max three 40 second reflows at
+260°C, parts cooled to room temperature between cycles
Temperature Coefficient of Inductance (TCL) +25 to +155 ppm/°C
Moisture Sensitivity Level (MSL) 1 (unlimited floor life at <30°C /
85% relative humidity)
Packaging 2000 per 7″ reel Paper tape: 8 mm wide, 1.0 mm thick,
4 mm pocket spacing
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.
I
I
J
H
A
B
overall
F
G
E
terminal
F
C
D
Te rminal wraparound:
approx 0.007/0,18 both ends
Suggested
Land Pattern
-40 -20 020406080100 140120
Ambient temperature (°C)
120
110
100
90
80
70
60
50
40
30
20
10
0
Percent of rated rmsI
25°C
10 100
Frequency (MHz)
Inductance (nH)
1000 10000
200
175
0
25
50
75
100
125
150
120 nH
68 nH
33 nH
3.9 nH
12 nH
120 nH
33 nH
3.9 nH
68 nH
12 nH
0
10
20
30
40
50
60
70
80
90
100
110
120
Q Factor
11010000100 1000
Frequency (MHz)
®
© Coilcraft, Inc. 2013
1102 Silver Lake Road
Cary, IL 60013
Phone 800-981-0363
Fax 847-639-1508
Email cps@coilcraft.com
www.coilcraft-cps.com
This product may not be used in medical or high
risk applications without prior Coilcraft approval.
Specifications subject to change without notice.
Please check our web site for latest information.
ST312RAA Series (0603)
SRF DCR
Inductance2 Percent Q 900 MHz 1.7 GHz min4 max5 Imax Color
Part number1 (nH) tolerance
min3 L typ Q typ L typ Q typ (MHz) (Ohms) (mA) code
ST312RAA1N6JLZ 1.6 @ 250 MHz 5 26 1.67 49 1.65 63 >5000 0.022 700 Red
ST312RAA1N8JLZ 1.8 @ 250 MHz 5 21 1.83 35 1.86 50 >5000 0.045 700 Black
ST312RAA3N3_LZ 3.3 @ 250 MHz 5,2 35 3.31 75 3.38 88 >5000 0.045 700 Blue
ST312RAA3N6_LZ 3.6 @ 250 MHz 5,2 18 3.72 53 3.71 65 >5000 0.063 700 Red
ST312RAA3N9_LZ 3.9 @ 250 MHz 5,2 20 3.95 49 3.96 67 >5000 0.080 700 Brown
ST312RAA4N3_LZ 4.3 @ 250 MHz 5,2 29 4.32 50 4.33 70 >5000 0.063 700 Orange
ST312RAA4N7_LZ 4.7 @ 250 MHz 5,2 18 4.72 47 4.75 57 >5000 0.116 605 Violet
ST312RAA5N1_LZ 5.1 @ 250 MHz 5,2 20 4.93 47 4.95 56 >5000 0.140 510 Green
ST312RAA5N6_LZ 5.6 @ 250 MHz 5,2,1 25 5.77 63 6.05 80 4760 0.075 700 Black
ST312RAA6N8_LZ 6.8 @ 250 MHz 5,2,1 28 6.75 60 7.10 81 4660 0.110 700 Red
ST312RAA7N5_LZ 7.5 @ 250 MHz 5,2,1 23 7.70 60 7.82 65 4320 0.106 700 Brown
ST312RAA8N2_LZ 8.2 @ 250 MHz 5,2,1 26 8.25 82 8.37 87 3880 0.115 700 Orange
ST312RAA8N7_LZ 8.7 @ 250 MHz 5,2,1 27 8.86 62 9.32 58 3680 0.109 700 Yellow
ST312RAA9N5_LZ 9.5 @ 250 MHz 5,2,1 22 9.70 59 9.92 61 4100 0.135 700 Blue
ST312RAA10N_LZ 10 @ 250 MHz 5,2,1 28 10.0 66 10.6 83 3860 0.130 700 Orange
ST312RAA11N_LZ 11 @ 250 MHz 5,2,1 26 11.0 53 11.5 56 3640 0.130 700 Gray
ST312RAA12N_LZ 12 @ 250 MHz 5,2,1 29 12.3 72 13.5 83 3220 0.130 620 Yellow
ST312RAA15N_LZ 15 @ 250 MHz 5,2,1 28 15.4 64 16.8 89 3020 0.170 600 Green
ST312RAA16N_LZ 16 @ 250 MHz 5,2,1 29 16.2 55 17.3 52 3040 0.170 600 White
ST312RAA18N_LZ 18 @ 250 MHz 5,2,1 29 18.7 70 21.4 69 2680 0.170 600 Blue
ST312RAA22N_LZ 22 @ 250 MHz 5,2,1 31 22.8 73 26.1 71 2380 0.190 560 Violet
ST312RAA23N_LZ 23 @ 250 MHz 5,2,1 39 24.1 71 28.0 67 2380 0.190 560 Orange
ST312RAA24N_LZ 24 @ 250 MHz 5,2,1 36 24.5 45 28.7 39 2380 0.190 560 Black
ST312RAA27N_LZ 27 @ 250 MHz 5,2,1 32 29.2 74 34.6 65 2380 0.220 530 Gray
ST312RAA30N_LZ 30 @ 250 MHz 5,2,1 32 31.4 47 39.9 28 2240 0.220 500 Brown
ST312RAA33N_LZ 33 @ 250 MHz 5,2,1 33 36.0 67 49.5 42 1900 0.220 500 White
ST312RAA36N_LZ 36 @ 250 MHz 5,2,1 32 39.4 47 52.7 24 1960 0.250 460 Red
ST312RAA39N_LZ 39 @ 250 MHz 5,2,1 36 42.7 60 60.2 40 1740 0.250 460 Black
ST312RAA43N_LZ 43 @ 250 MHz 5,2,1 28 47.0 44 64.9 21 1580 0.280 440 Orange
ST312RAA47N_LZ 47 @ 200 MHz 5,2,1 35 52.2 62 77.2 35 1560 0.280 440 Brown
ST312RAA51N_LZ 51 @ 200 MHz 5,2,1 38 55.5 69 82.2 34 1560 0.270 420 Blue
ST312RAA56N_LZ 56 @ 200 MHz 5,2,1 37 62.5 56 97.0 26 1480 0.310 420 Red
ST312RAA68N_LZ 68 @ 200 MHz 5,2,1 35 80.5 54 168 21 1380 0.340 410 Orange
ST312RAA72N_LZ 72 @ 150 MHz 5,2,1 35 82.0 53 135 20 1360 0.490 340 Yellow
ST312RAA82N_LZ 82 @ 150 MHz 5,2,1 29 96.2 54 177 21 1300 0.540 340 Green
ST312RAAR10_LZ 100 @ 150 MHz 5,2,1 28 124 49 — — 1140 0.580 310 Blue
ST312RAAR11_LZ 110 @ 150 MHz 5,2,1 30 138 43 — — 1080 0.610 310 Violet
ST312RAAR12_LZ 120 @ 150 MHz 5,2,1 28 166 39 — — 1020 0.650 270 Gray
ST312RAAR15_LZ 150 @ 150 MHz 5,2,1 28 250 25 — — 900 0.915 250 White
ST312RAAR18_LZ 180 @ 100 MHz 5,2,1 25 305 22 — — 820 1.25 210 Black
1. When ordering, specify tolerance, termination and testing codes:
ST312RAAR39JLZ
Tolerance: F = 1% G = 2% J = 5%
Termination: L = RoHS compliant silver-palladium-platinum glass frit.
Special order:
S = Tin-lead (63/37) over silver-platinum-glass frit.
T = Tin-silver-copper (95.5/4/0.5) over silver-platinum-
glass frit.
R = Tin over nickel over silver-platinum-glass frit.
P = Tin-lead (63/37) over tin over nickel over silver-
platinum-glass frit.
Q = Tin-silver-copper (95.5/4/0.5) over tin over nickel
over silver-platinum-glass frit.
Testing: Z = COTS
H = Group A screening per Coilcraft CP-SA-10001
0603 CHIP INDUCTORS
2. Inductance measured at 250 MHz using a Coilcraft SMD-A test fixture
and Coilcraft-provided correlation pieces with an Agilent/HP 4286A
impedance analyzer or equivalent.
3. Q measured at the same frequency as inductance using an Agilent/
HP 4291A with an Agilent/HP 16197A test fixture or equivalents.
4. SRF measured using an Agilent/HP 8753ES network analyzer and a
Coilcraft CCF1232 test fixture.
5. DCR measured on a Keithley 580 micro-ohmmeter and a Coilcraft
CCF1010 test fixture.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Document ST195-2 Revised 06/12/13
