Cylindrical Style EMI Filters
BL Series – .375 Dia. – Button Epoxy Sealed –
Circuits Available – C & L
APPLICATIONS
The BL series offers effective filtering from
30 KHz up through 1 GHz. It offers epoxy
resin seals on both ends in order to
optimize volumetric efficiency and reduce
cost. Where severe moisture environments
exist the slightly larger companion BK
series is recommended as it incorporates
a glass to metal hermetic seal at both
ends. The BL series is designed for bulk-
head mounting in a slotted hole with nut
and lockwasher supplied. This series is
ideal for low to medium impedance
circuits where large amounts of capaci-
tance to ground can be tolerated. In the
“L” section version an internal ferrite bead
element provides both inductance and
series resistance (lossy characteristic)
which improves insertion loss at lower
current ratings and provides superior
transient performance.
Alternate lead configurations or special
capacitance values may be ordered.
Custom packages or filter arrays utilizing
the BL series can be furnished.
• High DC current rating: 15 Amps.
CHARACTERISTICS
• Internal ferrite bead provides inductance
for the L-section version.
SPECIFICATIONS
1. Case/Terminal Plating:
Electro-tin standard – Gold or silver available
2. Material:
Case: Brass Standard – Steel available
End Seal: Epoxy
Terminals: Copper nailhead standard
3. Operating Temperature Range:
-55°C to +125°C
4. Electrical Characteristics:
A. Rated Voltage: See chart
B. Insulation Resistance:
At 25°C: 1,000 megohm-microfarad min.,
or 50,000 megohms min.,
whichever is less, at the rated
DC voltage
At 125°C: 100 megohm-microfarad
min., or 5,000 megohms
min., whichever is less
C. Dielectric Withstanding Voltage (DWV):
R-level designs:
2.0 times rated DC voltage
Class B designs:
2.5 times rated DC voltage
D. Capacitance: Values listed in chart are
“guaranteed minimum value” (GMV)
5. Marking:
Standard Marking: AVX, AVX part number,
lot code
BL2 only: Letter “L” denotes ferrite bead
inductor at threaded end
See Reliability Codes section for definition of
Reliability Level marking. See How to Order
section for part number construction.
6. Installation:
A. Mounting Torque:
44 oz-in. ± 4 oz-in.
B. Refer to “Installation, Handling, Hardware
Options” section of the catalog.
STANDARD CONFIGURATION
.375
±.010
.040
±.010
250-28 UNF-2A (1/4-28)
.050
.060
REF.
.200
±.010
.150
±.032
*
±.010
.150
MAX.
.280
±.032
.030
±.010
* = A FOR .187
±.010
THREAD
B FOR .312 THREAD
(See Note 1)
CIRCUIT DIAGRAMS
THRD
END
C
BL1
millimeters (inches)
.25
.76
.81
1.02
1.52
(.010)
(.030)
(.032)
(.040)
(.060)
2.54
3.81
4.57
5.08
9.53
(.100)
(.150)
(.180)
(.200)
(.375)
Notes:
1. All BL2 L-Section Filters have
inductor (bead) at threaded
end.
2. Metric equivalent dimensions
given for information only.
L
2
BL2 (See Note 1)
(See Note 2)
29
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