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
= Group A 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
®
Document ST163-1 Revised 06/12/03
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.
© Coilcraft, Inc. 2013
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
Document ST163-1 Revised 06/12/03
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.
© Coilcraft, Inc. 2013
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