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Specialist applications
Syfer’s range of 250Vdc chip capacitors is ideal for
telephone line filtering (Tip & Ring/Ring Detect)
applications.
Tip & Ring/Ring Detect
capacitors
l Small surface mount package compared to traditional
through hole capacitors
l Suitable as replacements for high voltage leaded film
capacitors, thereby saving pcb board space and weight
l Low ESR
l Improved temperature performance compared to film
capacitors
l FlexiCap™ option available
Capacitance range
1812 2220 2225
250Vdc 100 - 470nF 180 - 820nF 560nF - 1.0µF
Ordering information - Tip & Ring/Ring Detect capacitors
1812 J 250 0474 K X T
Chip size Termination Voltage d.c. Capacitance in picofarads (pF) Capacitance
tolerance
Dielectric
codes Packaging
1812
2220
2225
J = Nickel barrier
Y = FlexiCapTM
termination base
with nickel barrier
(100% matte tin
plating). RoHS
compliant.
250 = 250V First digit is 0. Second and third digits are
signicant gures of capacitance code.
The fourth digit is number of zeros following.
Example:
0474 = 470,000pF = 470nF
J = ±5%
K = ±10%
M = ±20%
X = X7R
T = 178mm
(7”) reel
R = 330mm
(13”) reel
B = Bulk pack
- tubs
Dened Temperature /
Voltage Coefcient of
Capacitance
X7R capacitors are available from Syfer with a
defined capacitance variation under applied dc
voltage, across the full operating temperature
range. Whilst the capacitance of C0G/NP0 chips
does not vary with applied voltage, standard X7R
capacitors exhibit capacitance fluctuation, but with
no specified limit. For applications where a limit
is required, Syfer is able to offer either a “B” code
dielectric (conforms to MIL “BX” dielectric and IECQ-
CECC “2X1”) or “R” code dielectric (conforms to MIL
“BZ” dielectric and IECQ-CECC “2C1”).
For part numbering, the “X” denoting the X7R dielectric code
needs to be replaced by either “B” or “R”. Please contact the
Sales Office for full range information.
X7R
Dielectric characteristics Stable
IECQ-CECC
EIA
MIL
2C1 2R1 2X1
-X7R -
BZ - BX
Rated temperature range -55ºC to +125ºC
Maximum capacitance
charge over temperature
range
No DC voltage applied ±20% ±15% ±15%
Rated DC voltage applied +20-30% -+15-25%
Syfer dielectric ordering
code R X B