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Notes: 1. Performance and quality attributes and conditions not expressly stated in this specification sheet are intended to be excluded and do not form a part of this specification sheet. 2. Electrical specifications
and performance data contained herein are based on Mini-Circuit’s applicable established test performance criteria and measurement instructions. 3. The parts covered by this specification sheet are subject to
Mini-Circuits standard limited warranty and terms and conditions (collectively, “Standard Terms”); Purchasers of this part are entitled to the rights and benefits contained therein. For a full statement of the Standard
Terms and the exclusive rights and remedies thereunder, please visit Mini-Circuits’ website at www.minicircuits.com/MCLStore/terms.jsp.
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IF/RF MICROWAVE COMPONENTS
50Ω 0.01 to 250 MHz
RF Transformer
Surface Mount T1.18-3+
T1.18-3
CASE STYLE: W38
PRICE: $5.65 ea. QTY (1-9)
Maximum Ratings
Pin Connections
Operating Temperature -20°C to 85°C
Storage Temperature -55°C to 100°C
RF Power 250mW
DC Current 30mA
Transformer Electrical Specications
REV. A
M98898
T1.18-3-KK81
IG/TD/CP
110916
Typical Performance Data
Cong. C
Ω
RATIO
(Secondary/Primary)
FREQUENCY
(MHz)
INSERTION LOSS*
3 dB
MHz
2 dB
MHz
1 dB
MHz
1.18 0.01-250 0.01-250 0.02-200 0.03-50
* Insertion Loss is referenced to mid-band loss, 0.15 dB typ.
PRIMARY DOT 4
PRIMARY 6
SECONDARY DOT 3
SECONDARY 1
SECONDARY CT —
NOT USED 2,5
FREQUENCY
(MHz)
INSERTION
LOSS
(dB)
INPUT
R. LOSS
(dB)
Features
• wideband, 0.01 to 250 MHz
• excellent return loss
• also available with plug-in (X65)
surface mount gull-wing (KK81) leads
Applications
• HF/VHF
• impedance matching
0.01 1.28 9.92
0.04 0.30 19.95
0.10 0.20 26.49
0.13 0.25 21.52
0.40 0.16 31.57
5.04 0.14 28.04
74.29 0.86 11.69
128.74 1.30 6.88
169.30 1.42 4.22
250.00 1.62 1.40
T1.18-3-KK81
INSERTION LOSS
0.0
0.4
0.8
1.2
1.6
2.0
0 50 100 150 200 250
FREQUENCY (MHz)
INSERTION LOSS (dB)
T1.18-3-KK81
INPUT RETURN LOSS
0
10
20
30
40
50
0 50 100 150 200 250
FREQUENCY (MHz)
RETURN LOSS (dB)
Permanent damage may occur if any of these limits are exceeded.
Outline Dimensions ( )
inch
mm
Outline Drawing
A
B
C
D
E
F
.30
.27
.23
.010
.042
.020
7.62 6.86 5.84 0.25 1.07 0.51
G
J
K
L
wt
.100
.05
.09
.31
.036
grams
2.54 1.27 2.29 7.87 0.91
0.50
+RoHS Compliant
The +Suffix identifies RoHS Compliance. See our web site
for RoHS Compliance methodologies and qualifications