AIR CORE INDUCTORS
Air Core Inductors for Critical Applications
ST439RAT
ST470RAT
■
Small air core inductors feature high Q and tight tolerances
■
Acrylic jacket provides a flat top for pick and place
■
Solder coated leads ensure reliable soldering
Terminations
RoHS compliant tin-silver over copper. 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: –40°C to +140°C.
Packaging: –40°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)
+5 to +70 ppm/°C
Moisture Sensitivity Level (MSL)
1 (unlimited floor life at <30°C /
85% relative humidity)
Packaging
ST439RAT:
700/7″ reel Plastic tape: 12 mm wide, 0.32 mm thick,
8 mm pocket spacing, 3.3 mm pocket depth
ST470RAT:
500/7″ reel Plastic tape: 16 mm wide, 0.28 mm thick,
8 mm pocket spacing, 3.4 mm pocket depth
Part number
1
ST439RAT2N5KLZ
ST439RAT5N0_LZ
ST439RAT8N0_LZ
ST439RAT13N_LZ
ST439RAT19N_LZ
ST470RAT18N_LZ
ST470RAT22N_LZ
ST470RAT28N_LZ
ST470RAT36N_LZ
ST470RAT43N_LZ
SRF DCR
L
2
Percent Q
3
min
4
max
5
Imax
Weight
Turns (nH) tol min (GHz) (mOhm) (A) (mg)
1
2.5
10
145 12.5
1.1
4
31
2
5.0
5,2 140
6.5
1.8
4
42
3
8.0
5,2 140
5.0
2.6
4
52
4 12.5
5,2 137
3.3
3.4
4
65
5 18.5
5,2 132
2.5
3.9
4
78
6 17.5
5,2 100
2.2
4.5
4
100
7 22.0
5,2 102
2.1
5.2
4
110
8 28.0
5,2 105
1.8
6.0
4
118
9 35.5
5,2 112
1.5
6.8
4
133
10 43.0
5,2 106
1.2
7.9
4
147
1. When ordering, please specify
tolerance, termination
and
testing
codes:
ST470RAT43NGLZ
Tolerance: G
= 2%
J
= 5%
Termination: L
= RoHS compliant tin-silver over copper.
Special order:
T
= RoHS tin-silver-copper (95.5/4/0.5) or
S
= non-RoHS tin-lead (63/37).
Testing:
Z
= COTS
H
= Screening per Coilcraft CP-SA-10001
2. Inductance measured at 150 MHz on an Agilent/HP 4286A or equivalent with
a Coilcraft SMD-A test fixture and correlation.
3. Q measured at 150 MHz on an Agilent/HP 4291A or equivalent with a 16193A
test fixture or equivalent.
4. SRF measured on an Agilent/HP 8753ES network analyzer or equivalent
with a Coilcraft CCF1268 test fixture. Parts with SRF >5 GHz are verified to
>5 GHz in screening
5. DCR measured on a Keithley 580 Micro-Ohmmeter or equivalent.
6. Electrical specifications at 25°C.
Refer to Doc 362 “Soldering Surface Mount Components” before soldering.
Dimensions are in
inches
mm
®
Specifications subject to change without notice.
Please check our website for latest information.
Document ST107-1
Revised 10/24/11
1102 Silver Lake Road
Cary IL 60013
© Coilcraft, Inc. 2011
Phone 800-981-0363
Fax 847-639-1508
E-mail cps@coilcraft.com
Web www.coilcraft-cps.com
AIR CORE INDUCTORS
ST439RAT / ST470RAT Air Core Inductors
L vs Frequency – ST439RAT
25
20
18.5 nH
L vs Frequency – ST470RAT
60
55
50
43.0 nH
Inductance (nH)
Inductance (nH)
45
40
35
30
25
20
15
22.0 nH
35.5 nH
15
12.5 nH
28.0 nH
10
8.0 nH
5
5.0 nH
2.5 nH
17.5 nH
0
100
200
400
600
1000
10
100
200
400
600
1000
Frequency (MHz)
Frequency (MHz)
Q vs Frequency – ST439RAT
220
210
200
190
2.5 nH
Q vs Frequency – ST470RAT
135
130
125
120
17.5 nH
22.0 nH
28.0 nH
35.5 nH
Q factor
180
170
160
150
140
130
100
200
18.5 nH
8.0 nH
12.5 nH
Q factor
5.0 nH
115
110
105
100
95
43.0 nH
400
600
1000
90
100
200
400
600
1000
Frequency (MHz)
Frequency (MHz)
Typical Current Derating
120
110
100
Percent of rated
I
rms
90
80
70
60
50
30
20
10
0
-55 -40
-20
0
20
25°C
40
40
60
80
100
120
140 160
Ambient temperature (°C)
®
Specifications subject to change without notice.
Please check our website for latest information.
Document ST107-2
Revised 10/24/11
1102 Silver Lake Road
Cary IL 60013
© Coilcraft, Inc. 2011
Phone 800-981-0363
Fax 847-639-1508
E-mail cps@coilcraft.com
Web www.coilcraft-cps.com
