Frontier Electronics Corp.
667 E. COCHRAN STREET, SIMI VALLEY, CA 93065
TEL: (805) 522-9998
FAX: (805) 522-9989
E-mail: frontiersales@frontierusa.com
Web: frontierusa.com
SMD Balun Transformer—
SBT303-series
A. Electrical specifications:
Part No.
SBT303-11
SBT303-21
Turn Ratio
1:1
2:1
Insertion Loss 3 dB Max.
@5~400MHz
@5~250MHz
B. Mechanical dimensions: (Unit: mm)
M1
Dimension
Tolerance
6.9
Max.
M3
M2
0.60
± 0.15
M3
6.9
Max.
M5
M4
2.0
± 0.30
M5
4.40
Max.
1.70
M2
M1
6
1
M4
2
M4
N1
N2
1.20
N3
4.0
4
3
5.70
Mechanical dimension
Schematic
Land Pattern
C. Test configuration and connection:
(a) SBT-203-11:
(b) SBT-203-21:
D.
Note:
RoHS
compliant; for the
ROHS
parts, we add “-LFR” at the end of the P/N.
SMD Balun Transformer SBT303-series
Rev. A
Jan. 01, 2006. Page: 1 of 2
Frontier Electronics Corp.
667 E. COCHRAN STREET, SIMI VALLEY, CA 93065
TEL: (805) 522-9998
FAX: (805) 522-9989
E-mail: frontiersales@frontierusa.com
Web: frontierusa.com
SMD Balun Transformer—
SBT303-series
E. Characteristic curve:
S B T 3 0 3 -1 1
0.00
-1.00
-2.00
-3.00
-4.00
-5.00
-6.00
-7.00
-8.00
-9.00
-10.00
1
10
100
1000
I.L.
(dB)
Frequency (MHz)
S B T 3 0 3 -2 1
0.00
-1.00
-2.00
-3.00
-4.00
-5.00
-6.00
-7.00
-8.00
-9.00
-10.00
1
10
100
1000
I.L.
(dB)
Frequency (MHz)
SMD Balun Transformer SBT303-series
Rev. A
Jan. 01, 2006. Page: 2 of 2
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