B78108S1222K EPCOS Inc, B78108S1222K Datasheet - Page 19

• Manufacturer Part Number: B78108S1222K
• Description: CHOKE RF 2.2UH 1.0A AXIAL
• Manufacturer: EPCOS Inc
• Series: BCr
• Type: Ferrite Corer

Specifications of B78108S1222K

• Inductance: 2.2µH
• Tolerance: ±10%
• Current: 1A
• Dc Resistance (dcr): 250 mOhm Max
• Q @ Freq: 55 @ 7.96MHz
• Self Resonant Freq: 140MHz
• Package / Case: Axial
• Mounting Type: Through Hole
• Frequency - Test: 7.96MHz
• Material - Core: Ferrite Drum
• Applications: General Purpose
• Maximum Dc Current: 1000 mAmps
• Maximum Dc Resistance: 0.25 Ohms
• Self Resonant Frequency: 140 MHz
• Q Minimum: 55
• Termination Style: Axial
• Inductance Tolerance: ± 10%
• Dc Resistance Max: 0.25ohm
• Dc Current Rating: 1A
• Q Test Frequency: 7.96MHz
• Inductor Case Style: Axial Leaded
• No. Of Pins: 2
• Svhc: No SVHC (18-Jun-2010)
• Rohs Compliant: Yes
• Body Diameter: 4mm
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Shielding: -
• Current - Saturation: -
• Current - Temperature Rise: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: B78108S1222K000

8.3
Figure 13
ductance. One of the chokes has a two-layer winding and the other is randomly wound. The choke
with random windings has a considerably higher first resonance frequency. The spurious resonanc-
es are very much higher than 10 MHz. The impedance at frequencies above the first resonance fre-
quency is approximately five times higher. This leads to better interference suppression at high
frequencies.
Fig. 13
The RF characteristics of all chokes supplied by EPCOS are within the specifications and reproduc-
ible, as the winding processes which we have developed for single-layer, multilayer and random
winding ensure that the characteristics of the inductors produced display very little variation.
The reproducibility of electrical characteristics of chokes is mainly determined by the production
technique used. At EPCOS, coils are wound mainly by automatic machines (either fully or semi-au-
tomated). This permits even complicated winding patterns to be produced in large production runs
with very little variation in product characteristics. In
chokes, some wound manually and some by machine, are shown for comparison. With the random
winding used in this comparison, the advantages of machine winding are clearly noticeable.
General Technical Information
RF characteristics of various types of winding
Random wdg.
2-layer wdg.
Impedance | Z | versus frequency f
comparison between two-layer winding and random winding
shows the relation between the impedance and the frequency for two chokes of equal in-
27
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fig.
14, the impedance curves of several