®
© 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 ST312RAG
0603 CHIP INDUCTORS
■ Higher Q and lower DCR than other 0603 inductors
■ Highest SRF values – as high as 16 GHz
■ 43 inductance values from 1.8 to 150 nH
Core material Ceramic
Terminations Silver-palladium-platinum-glass frit. Other termina-
tions available at additional cost.
Ambient temperature –40°C to +125°C with Irms current, +125°C
to +140°C with derated current
Storage temperature Component: –55°C to +125°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 +125 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 mm thick,
4 mm pocket spacing
Typical Q vs Frequency
Typical L vs Frequency
A B C
max min
–
max max D E F G H I J
0.069 0.034
–
0.043 0.034 0.015 0.029 0.013 0.038 0.040 0.027 0.028 inches
1,75 0,86
–
1,09 0,86 0,38 0,74 0,33 0,96 1,02 0,69 0,71 mm
Current Derating
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.
A
B
overall
C
D
I
I
J
F
F
G
H
E
terminal Terminal wraparound:
approx 0.01/0,24 both ends
Pick and
place
surface
Suggested
Land Pattern
-40-55 -20 020406080100 160140120
Ambient temperature (°C)
Percent of rated rmsI
120
110
100
90
80
70
60
50
40
30
20
10
0
25°C
1
10
100
1000
10 100 100001000
Inductance (nH)
Frequency (MHz)
10 nH
150 nH
24 nH
51 nH
82 nH
0
20
40
60
80
100
120
140
160
10 100 100001000
Q Factor
Frequency (MHz)
10 nH
150 nH
24 nH
51 nH
82 nH
Document ST537-1 Revised 07/16/12
ST312RAG Series (0603)
®
© 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.
0603 CHIP INDUCTORS
Document ST537-2 Revised 07/16/12
L test Q min3 SRF DCR
Inductance2 Percent freq at 900 MHz 1.7 GHz min4 max5 Imax Color
Part number1 (nH) tolerance (MHz) 250 MHz L typ Q typ3 L typ Q typ3 (GHz) (Ohms) (mA) code
ST312RAG1N8JLZ 1.8 5 250 17 1.77 40 1.77 65 >5.00 0.035 800 Black
ST312RAG3N3_LZ 3.3 5,2 250 35 3.28 67 3.32 104 >5.00 0.030 800 Blue
ST312RAG3N6_LZ 3.6 5,2 250 32 3.59 70 3.62 116 >5.00 0.033 800 Red
ST312RAG3N9_LZ 3.9 5,2 250 33 3.88 68 3.95 108 >5.00 0.045 800 Brown
ST312RAG4N3_LZ 4.3 5,2 250 28 4.29 58 4.31 91 >5.00 0.080 710 Orange
ST312RAG4N7_LZ 4.7 5,2 250 22 4.65 48 4.71 75 >5.00 0.100 720 Violet
ST312RAG5N1_LZ 5.1 5,2 250 38 5.08 84 5.12 140 >5.00 0.042 800 Green
ST312RAG5N6_LZ 5.6 5,2 250 43 5.6 87 5.73 145 >5.00 0.042 800 Black
ST312RAG6N0_LZ 6.0 5,2 250 40 5.92 94 6.12 154 4.80 0.053 800 White
ST312RAG6N8_LZ 6.8 5,2 250 34 6.83 88 7.05 143 4.64 0.050 800 Red
ST312RAG7N2_LZ 7.2 5,2 250 36 7.25 96 7.38 139 4.32 0.080 800 Green
ST312RAG7N5_LZ 7.5 5,2 250 32 7.55 81 7.85 112 4.24 0.100 800 Brown
ST312RAG8N2_LZ 8.2 5,2 250 37 8.21 96 8.39 148 4.72 0.054 800 Orange
ST312RAG8N7_LZ 8.7 5,2 250 33 8.73 97 9.00 149 4.40 0.054 800 Yellow
ST312RAG9N1_LZ 9.1 5,2 250 38 9.18 76 9.64 109 4.08 0.054 800 Black
ST312RAG9N5_LZ 9.5 5,2 250 40 9.56 98 9.99 149 3.92 0.053 800 Blue
ST312RAG10N_LZ 10 5,2 250 38 10.16 90 10.64 142 3.44 0.054 800 Orange
ST312RAG11N_LZ 11 5,2 250 36 11.06 78 11.82 108 3.28 0.075 800 Gray
ST312RAG12N_LZ 12 5,2 250 32 12.26 69 13.20 91 3.28 0.110 750 Yellow
ST312RAG15N_LZ 15 5,2 250 36 15.41 83 17.20 124 2.88 0.085 800 Green
ST312RAG16N_LZ 16 5,2 250 32 16.37 77 18.70 116 2.80 0.095 790 White
ST312RAG18N_LZ 18 5,2 250 34 18.56 76 20.90 100 2.64 0.075 800 Blue
ST312RAG22N_LZ 22 5,2 250 30 22.7 77 25.90 88 2.52 0.140 600 Violet
ST312RAG23N_LZ 23 5,2 250 36 24.0 69 29.53 80 2.40 0.195 560 Orange
ST312RAG24N_LZ 24 5,2 250 43 24.9 77 28.9 91 2.36 0.085 800 Black
ST312RAG27N_LZ 27 5,2 250 34 28.4 74 34.0 84 2.24 0.150 620 Gray
ST312RAG30N_LZ 30 5,2 250 40 31.5 82 37.9 82 2.24 0.130 720 Brown
ST312RAG33N_LZ 33 5,2 250 38 34.9 76 42.9 80 2.16 0.170 560 White
ST312RAG36N_LZ 36 5,2 250 36 38.5 69 50.0 64 2.00 0.225 480 Red
ST312RAG39N_LZ 39 5,2 250 38 41.5 78 51.9 74 1.96 0.190 540 Black
ST312RAG43N_LZ 43 5,2 250 36 45.7 83 58.1 76 1.96 0.170 630 Orange
ST312RAG47N_LZ 47 5,2 200 39 50.6 77 66.9 72 1.84 0.270 440 Brown
ST312RAG51N_LZ 51 5,2 200 37 54.6 73 71.3 62 1.84 0.280 440 Blue
ST312RAG56N_LZ 56 5,2 200 36 60.3 74 79.9 56 1.76 0.30 420 Red
ST312RAG68N_LZ 68 5,2 200 37 75.5 73 113.3 49 1.60 0.33 400 Orange
ST312RAG72N_LZ 72 5,2 150 36 80.8 69 — — 1.52 0.42 380 Yellow
ST312RAG75N_LZ 75 5,2 150 36 84.6 71 — — 1.52 0.52 340 Violet
ST312RAG82N_LZ 82 5,2 150 36 94.0 62 — — 1.44 0.46 350 Green
ST312RAG91N_LZ 91 5,2 150 36 103.0 64 — — 1.32 0.58 310 White
ST312RAGR10_LZ 100 5,2 150 36 114.0 69 — — 1.36 0.54 340 Blue
ST312RAGR11_LZ 110 5,2 150 35 126.2 63 — — 1.28 0.58 310 Violet
ST312RAGR12_LZ 120 5,2 150 36 142.4 61 — — 1.24 0.72 280 Gray
ST312RAGR15_LZ 150 5,2 150 36 188.8 57 — — 1.08 0.82 260 White
1. When ordering, specify tolerance, termination and testing codes:
ST312RAGR39GLZ
Tolerance: G = 2% J = 5%
Termination: L = RoHS compliant silver-palladium-platinum-glass frit.
Special order:
S = Tin-lead (63/37) over silver-palladium-platinum-
glass frit.
T = Tin-silver-copper (95.5/4/0.5) over silver-palladium-
platinum-glass frit.
Testing: Z = COTS
H = Screening per Coilcraft CP-SA-10001
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 using an Agilent/HP 4291A with an Agilent/HP 16197A
test fixture or equivalents.
4. SRF measured using an Agilent/HP 8753ES network analyzer or
equivalent and a Coilcraft CCF1232 test fixture.
5. DCR measured on a Keithley 580 micro-ohmmeter or equivalent and a
Coilcraft CCF1010 test fixture.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
