Ultra High Current
EMI Ferrite Chip Beads
Steward’s family of monolithic surface mount ferrites provide compact, cost effective EMI filtering for today’s densely
packed single and double sided surface mount PCB designs. Successful EMI filtering often depends on reducing high
frequency noise at its source, our small footprint SMT ferrite enables designers to place high performance filtering very
close to troublesome high frequency devices.
Features:
• High current perfomance (up to 10 amps continuous operation) • Peak impedance at approximately 2 GHz • Small footprint
• Economical component for high current applications requiring discrete signal filtering • High impedance retention under DC Bias
• Superior retention under bias when compared to older wire wound components • Vibration resistant, monolithic construction
• Lead Free
Applications:
• High current products • Differential mode filtering of power input pins of oscillators and logic devices using high speed clocks
• Filtering of low frequency input/output signals entering/leaving shielded enclosures • High frequency filtering of medium speed clocks
and video signals • Preventing oscillations in high frequency amplifiers • Discrete component filtration in power supplies
Test Specifications:
•Maximum current ratings ( rated I MAX ) are determined by testing to a maximum temperature rise of 40oC with continuous current.
•Board level components are rated up to a maximum of 75 volts
Tested with: •HP4396A (100KHz - 1.8 GHz) or HP8753 (to 6 GHz) Network/Spectrum Analyzer •HP43961A Impedance Test Kit
•HP16192A Test Fixture or Inter-Continental Microwave custom fixtures •HP16200A DC Bias Adapter •Philips PM2811 DC Power
Supply •Ambient Temperature 23.5oC + 2o •Bandwidth 3 kHz •Sweep Time 423 ms •Impedance is rated at + 25% @100MHz
PART NUMBERING SYSTEM EXAMPLE
B
A
DM
1612
X
560
R
Product Series
Code
Part Size
Code
Rated Continuous
Current Code
Impedance Value
Code
Packaging
Code
C
-10
Additional
Description
Ambient Temperature Range: -55°C to +125°C
D
IMPEDANCE (Z)
TYPICAL OHMS @
1 GHz
DCR
MAX
(Ohms)
RATED
I MAX
(continuous)
mA
90
100
0.004
10000
175
225
0.004
10000
PART
NUMBER
FIGURE #
(ON BACK)
A
mm
(inches)
B
mm
(inches)
C
mm
(inches)
D
mm
(inches)
100 MHz
500 MHz
DM1612X560R-10
1
4.06 + 0.200
(0.160 + 0.008)
3.05 + 0.200
(0.120 + 0.008)
2.28 + 0.200
(0.090 + 0.008)
0.46 + 0.200
(0.018 + 0.008)
56
DM3312X101R-10
2
8.50 + 0.200
(0.335 + 0.008)
3.05 + 0.200
(0.120 + 0.008)
2.28 + 0.200
(0.090 + 0.008)
0.51 + 0.200
(0.020 + 0.010)
100
Comparison of impedance (under bias) to older wire type parts
DM1612 (DM) vs. Conventional Wound Part (WP)
Z vs. Frequency
Impedance Under DC Bias
150
DM3312 (DM) vs. Conventional Wound Part (WP)
Z vs. Frequency
Impedance Under DC Bias
250
DM 0.0A
DM 0.0A
100
DM 1.0A
WP 0.0A
50
WP 1.0A
Impedance (Ω)
Impedance (Ω)
200
150
DM 1.0A
100
WP 0.0A
WP 1.0A
50
0
1
10
100
Frequency (MHz)
Steward
www.steward.com
1000
0
1
10
100
Frequency (MHz)
North America - U.S.A. • Phone: +1 423 308 1690 • Fax +1 423 308 1622 • e-mail: americas@steward.com
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Asia / Pacific - Singapore • Phone: +65 6272 2646 • Fax : +65 6272 6165 • e-mail: asia@steward.com
REV
China • Phone: +86-757-2563 8860 • Fax : +86-757-2563 8862 • e-mail: china@steward.com
1000
Brochure 8
4.01 01/2006
