AIR CORE INDUCTORS
AirCoreInductors for Critical Applications
■
High Q over a wide range of frequencies
ST350RAT
ST394RAT
■
Acrylic jacket provides a flat top for pick and place
■
Solder coated leads ensure reliable soldering
Terminations
Tin-silver over copper. Other terminations available at
additional cost.
Ambient temperature
–40°C to +125°C with
Imax
current, +125°C
to +145°C with derated current
Storage temperature
Component: –40°C to +140°C.
Tape and reel 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
ST350RAT:
500 per 7″ reel Plastic tape: 8 mm wide, 0.3 mm
thick, 4 mm pocket spacing, 1.5 mm pocket depth
ST394RAT:
500 per 7″ reel Plastic tape: 12 mm wide, 0.3 mm
thick, 4 mm pocket spacing, 1.6 mm pocket depth
SRF DCR
L
2
Percent Q
3
min
4
max
5
Part number
1
Turns (nH)
tol
min (GHz) (mOhm)
ST350RAT1N7KLZ 2
1.65
10
100 10
4.0
ST350RAT2N6JLZ 3
2.55
5
100
8.2
5.0
ST350RAT3N9_LZ 4
3.85
5,2
100
7.5
6.0
ST350RAT5N4_LZ 5
5.40
5,2
100
7.0
8.0
ST394RAT5N6_LZ 6
5.60
5,2
100
6.5
9.0
ST394RAT7N2_LZ 7
7.15
5,2
100
6.0
10
ST394RAT8N8_LZ 8
8.80
5,2
100
6.0
12
ST394RAT9N9_LZ 9
9.85
5,2
100
5.2
13
ST394RAT13N_LZ 10 12.55
5,2
100
4.6
14
1. When ordering, specify
tolerance, termination
and
testing
codes:
Imax
(A)
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6
ST394RAT10GLZ
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 800 MHz on an Agilent/HP 4286A or equiva-
lent with a Coilcraft SMD-A test fixture and correlation.
3. Q measured at 800 MHz on an Agilent/HP 4291A or equivalent with a
16193A test fixture or equivalent.
4. SRF measured on an Agilent/HP 8753ES 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
Suggested Land Patterns
inches
mm
®
Specifications subject to change without notice.
Please check our website for latest information.
Document ST163-1
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
ST350RAT/ST394RAT Air Core Inductors
L vs Frequency – ST350RAT Series
14
12
L vs Frequency – ST394RAT Series
14
12
12.55 nH
Inductance (nH)
Inductance (nH)
10
8
6
4
2
0
100
1000
5.40 nH
3.85 nH
2.55 nH
1.65 nH
10
8
9.85 nH
8.80 nH
7.15 nH
6
4
2
0
100
1000
5.60 nH
Frequency (MHz)
Frequency (MHz)
Q vs Frequency – ST350RAT Series
250
2.55 nH 1.65 nH
3.85 nH
5.40 nH
Q vs Frequency – ST394RAT Series
250
200
7.15 nH 8.80 nH
5.60 nH
12.55 nH
9.85 nH
200
Q factor
Q factor
150
150
100
100
50
0
50
0
100
Frequency (MHz)
1000
100
Frequency (MHz)
1000
Typical Current Derating
120
110
100
Percent of rated
I
rms
90
80
70
60
50
40
30
20
10
0
-40
-20
0
20
40
60
80
100
120 140
Ambient temperature (°C)
®
25°C
Specifications subject to change without notice.
Please check our website for latest information.
Document ST163-2
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
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