EMI Filters
KNF21 Series
Features
• Distributed constant type LC filter.
Prevents ringing caused by circuit
impedance.
• Stable noise attenuation over wide
frequency range.
• Low profile (T=0.95mm max.) suitable for
miniature electronic equipments.
• First class auto-placement
How to Order
KNF 21 100 C65 DA 3T S
①
② ③
④
⑤ ⑥ ⑦
①
Series
②
Size Code
21
025
050
100
C17
C33
C65
DA
2012 (EIA: 0805)
25MHz
50MHz
100MHz
17pF
33pF
65pF
200
400
200MHz
400MHz
③
Cut off Frequency
Applications
RoHS Compliant
• PCs, Laser Printers, Cellular Phone,
Clock Data Lines for LCD Display
• High Speed Video Signal Circuits and
Interface Circuits
• High Speed Digital Circuits
Attenuation
(Typical)
Rated Rated Operating
Current Voltage Temperature
④
Capacitance
C130
C235
130pF
235pF
Specifications
Part Number
Cut off Capacitance
Frequency (+50/
−20%)
235pF
130pF
65pF
33pF
17pF
⑤
Application
Digital Circuit in General
T&R: 3000 pcs. (Std.)
Std.
KNF21025C235DA3TS
25MHz
KNF21050C130DA3TS
50MHz
KNF21100C65DA3TS
100MHz
KNF21200C33DA3TS
200MHz
KNF21400C17DA3TS
400MHz
•
Storage
200 to 600MHz (@20dB) 150mA 25VDC
350 to 850MHz (@20dB) 150mA 25VDC
450 to 950MHz (@20dB) 150mA 25VDC
−25
to
+85°C
700 to 1200MHz (@20dB) 150mA 25VDC
900 to 1400MHz (@20dB) 150mA 25VDC
⑥
Packaging
3T
⑦ Termination
S
condition
Temperature:
−10
to
+45°C
Humidity: 45 to 75%RH
Dimensions
L
(Unit: mm)
Attenuation Characteristics
KNF21 Series
R
W
10
0
Attenuation (dB)
IN
OUT
Input Direction Mark
−
10
−
20
−
30
−
40
−
50
KNF21025C235DA
KNF21050C130DA
KNF21100C65DA
KNF21200C33DA
KNF21400C17DA
1
10
100
1000
10000
P
G
P
CODE
L
W
T
Dimensions
2.00±0.20 1.25±0.20 0.80±0.15
CODE
G
P
R
≥0.01
Dimensions
0.40±0.30 0.30±0.20
T
Frequency (MHz)
Recommended Land Pattern
(Unit: mm)
Packaging Specification
• Taping (3,000/ reel)
Taping Direction (W)
(Unit: mm)
4.0
W (Standard)
Direction of Feed
CODE
T
Dimensions
3.20
W
2.30
R
1.00
C
1.20
P
0.80
Q
0.40
S
0.60
D
0.3 to 0.4
U
2.00
8.0
EMI Filters
KNF21 Series
<Impedance Matching Free>
• Stable attenuation against impedance change
• Good impedance matching without ringing
or distortion even at the time of IC ON/ OFF
and pattern layout change
Output Waveform (Clock frequency 25MHz)
R
LC filter
KNF21100
1MΩ
Test circuit
300Ω
<No Ringing>
Excellent Impedance Matching
KNF series
Output waveform
LC filter
Output waveform
No filter
Output waveform
• Wide attenuation up to high frequency range
without distortion
Attenuation Bandwidth
KNF21100
LC Filter (T-Type)
120
Spectrum att. (dBuV)
100
80
60
40
25
125 225 325 425 525 625 725 825 925
Frequency (MHz)
Filter passed
Test Circuit
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
AVX
:
KNF21100C65DA3TS KNF21400C17DA3TS KNF21200C33DA3TS