Cylindrical Style EMI Filters BK Series – .375/.410 Dia. – Button Hermetically Sealed Circuits Available – C & L APPLICATIONS The BK series offers effective filtering from 500 KHz to 10 GHz. Glass sealed for hermeticity, this low profile series is impervious to high moisture, solvents, or other severe environmental conditions commonly encountered in military applications. It is designed for bulkhead mounting in a slotted hole with nut and lockwasher supplied. This series is ideal for low to medium impedance circuits where large amounts of capacitance 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 and provides superior transient performance. Alternate lead configurations or special capacitance values may be ordered. Custom packages or filter arrays utilizing the BK series can be furnished. CHARACTERISTICS • .410 Dia. version (AK) meets or exceeds the applicable requirements of MIL-F28861/1. See QPL listings. • Glass hermetic seal on both ends. • Internal ferrite bead provides inductance for the L-section version. • High DC current rating: 15 Amps SPECIFICATIONS 1. Case/Terminal Plating: Electro-tin standard – Silver or gold available 2. Material: Case: Brass standard – Steel available End Seal: Mild steel Terminals: Nickel-iron alloy 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, whichever is less, at the rated DC voltage At 125°C: 100 megohm-microfarad min., or 5,000 megohms, whichever is less C. Dielectric Withstanding Voltage (DWV): R-level designs: 2.0 times rated DC voltage Class B, Class S 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 BK2 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 ALT. .410 DIA. MAX. See Note 4 .375 DIA. ±.010 .200 ±.010 .070 ±.010 (2 PLC) .250-28 UNF-2A (1/4-28) .050 .115 REF. .160 MAX. * = A FOR .187 THREAD B FOR .312 THREAD (See Note 1) .170 * ±.010 ±.010 .190 MAX CIRCUIT DIAGRAMS THRD END C BK1 millimeters (inches) .25 (.010) 4.75 (.187) 1.27 (.050) 4.83 (.190) 1.78 (.070) 5.08 (.200) 2.92 (.115) 7.93 (.312) 3.81 (.150) 9.53 (.375) 4.32 (.170) — — L2 BK2 (See Note 2) Notes: 1. Thread length option. Standard part numbers shown (e.g., BK1CA-103) are .187" thread length. Optional .312 length available. (e.g., BK1CB-103). 2. Ferrite bead inductor at threaded end (BK2 only). 3. Metric equivalent dimensions given for information only. 4. .410 Dia. (identified as AK) is required for all hi-rel tested parts (e.g., MIL-F-28861/1 series). (See Note 3) (See Note 1) 31 Cylindrical Style EMI Filters BK Series – .375/.410 Dia. – Button Hermetically Sealed Circuits Available – C & L SPECIFICATIONS AVX P/N BK1CA-125 BK1CB-125 BK2CA-125 BK2CB-125 BK1NA-704 BK1NB-704 BK2NA-704 BK2NB-704 BK1AA-103 BK1AA-454 BK1AB-454 BK1AA-754 BK1AA-105 BK2AA-454 BK2AB-454 BK2AA-754 BK2AA-105 BK1HA-254 BK1HB-254 BK2HA-254 BK2HB-254 BK1LA-753 BK1LA-154 BK1LB-154 BK2BA-203 BK2LA-753 BK2LA-154 BK2LB-154 CKT C C L2 L2 C C L2 L2 C C C C C L2 L2 L2 L2 C C L2 L2 C C C L2 L2 L2 L2 CAP1 1.2 1.2 1.2 1.2 .7 .7 .7 .7 .01 .45 .45 .75 1.0 .45 .45 .75 1.0 .25 .25 .25 .25 .075 .15 .15 .02 .075 .15 .15 DC Voltage 50 50 50 50 70 70 70 70 100 100 100 100 100 100 100 100 100 150 150 150 150 200* 200* 200* 200* 200* 200* 200* * Also rated 125 VAC/400 Hz 1 Decimal point values indicate capacitance in microfarads. Non-decimal point values indicate capacitance in picofarads. 2 Insertion loss limits are based on theoretical values. Actual measurements may vary due to internal capacitor resonances and other design constraints. 32 30 KHz 15 15 15 15 10 10 10 10 – 6 6 11 12 6 6 11 12 – – – – – – – – – – – Insertion Loss2 Per MIL-STD-220, +25°C 150 300 1 10 100 KHz KHz MHz MHz MHz 28 33 40 40 70 28 33 40 40 70 28 33 40 40 70 28 33 40 40 70 24 30 40 40 64 24 30 40 40 64 24 30 40 40 64 24 30 40 40 64 – – 2 20 40 19 25 36 40 60 19 25 36 40 60 24 30 40 40 64 24 30 40 40 65 19 25 36 40 60 19 25 36 40 60 24 30 40 40 64 24 30 40 40 65 14 20 31 40 56 14 20 31 40 56 14 20 31 40 56 14 20 31 40 56 – 7 18 37 46 10 16 26 40 52 10 16 26 40 52 – – 7 25 40 – 7 18 37 51 10 16 26 40 52 10 16 26 40 52 1 GHz 70 70 70 70 70 70 70 70 55 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 60 70 70 70