B82498B1681J EPCOS Inc, B82498B1681J Datasheet - Page 15

• Manufacturer Part Number: B82498B1681J
• Description: INDUCTOR, 0805 CASE, 680NH
• Manufacturer: EPCOS Inc

Specifications of B82498B1681J

• Inductance Tolerance: ± 5%
• Dc Resistance Max: 0.5ohm
• Dc Current Rating: 250mA
• Resonant Frequency: 450MHz
• Q @ Vr F: 20
• Core Material: Ferrite
• Inductor Case Style: 0805
• No. Of Pins: 2
• Inductance: 680nH
• Svhc: No SVHC (18-Jun-2010)
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.8
The stray inductance L
both coils when a current-compensated choke is short-circuited at one end. This affects symmetri-
cal interference.
Fig. 11
7.9
The inductance decrease L / L
inductance L
crease is caused by the magnetization of the core material, which is a function of the field strength,
as induced by the operating current. Generally the decrease is less than 10 % .
7.10
The dc resistance is the resistance of a line as measured using direct current at a temperature of
20 C, whereby the measuring current must be kept well below the rated current.
R
R
R
7.11
Parasitic capacitances ( C
the component geometry. These capacitances may affect the two lines mutually (symmetrically) as
well as the line-to-ground circuit (asymmetrically). The design of all EMC components supplied by
EPCOS minimizes the parasitic effects. Due to this, these components have excellent interference
suppression characteristics right up to high frequencies.
7.12
The quality factor Q is the quotient of the imaginary component of the impedance divided by the real
component.
7.13
f
f
Q
L
General Technical Information
typ
min
max
is the frequency at which the inductance of a choke is determined.
is the frequency for which the quality factor Q of a choke is specified.
Stray inductance L
Inductance decrease L / L
DC resistance R
typical value
minimum value
maximum value
Winding capacitance, parasitic capacitance C
Quality factor Q
Measuring frequencies f
Stray inductance
0
measured at zero current. The data sheets specify this as a percentage. This de-
S
P
typ
(also termed leakage inductance) is the inductance measured through
), which impair the RF characteristics of the components, are related to
, R
S
0
min
is the drop in inductance at a given current relative to the initial
, R
Q
, f
0
max
L
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