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BNX029-01L：muRata Block Type EMI Suppression Filter (EMIFIL)
- Part No.:
- BNX029-01L
- Manufacturer:
- Murata Electronics
- Category:
- Product information
- Package:
- 4-SMD, No Lead
- Datasheet:
-
BNX029-01L.pdf
- Description:
- FILTER LC 100UF SMD
- Payment:
- Shipping:
Article Details
One requirement under the noise standard (CISPR 11*) that applies to medical and healthcare equipment deals with conductive noise (noise terminal voltage). The level of such conductive noise in the frequency band from 150 kHz to 30 MHz must comply with the standard.
This article introduces an example of the use of a BNX series block type EMI filter to suppress conductive noise.
* CISPR 11 is a noise standard that applies to medical and healthcare equipment.
Verification using DC-DC converter
For verification, we prepared a measuring environment with a DC-DC converter as the EUT in order to evaluate conductive noise as specified in CISPR 11.
(Note)
The measurement system and measurement method stipulated by CISPR 11 are used to evaluate leakage of conductive noise into the DC power line.
Conductive noise measurement results
We observed the noise spectrum of frequencies that are integral multiples of 500 kHz, the switching frequency. In addition, noise exceeding the allowable level for CISPR 11 Class A Group 1 (industrial settings) was measured.
It seems likely that noise due to switching by the DC-DC converter (switching noise) was transmitted onto the DC line.
(Reference)
Allowable noise values for Class A (industrial settings) and Class B (residential settings)
Countermeasure using noise filter
We inserted a BNX029-01 block type filter on the input side to suppress the conductive noise. The BNX029-01 is a filter product that comprises an LC π-type filter as a single component. This filter provides noise suppression over a wide frequency band from 15 kHz to 1 GHz. It can tolerate large currents of 20 A and is a suitable noise countermeasure for DC power lines.
| Part Number | Size | Rated Current | Insertion Loss |
|---|---|---|---|
| BNX029-01 | 12.1 × 9.1 mm | 20 A |
|
Countermeasure results
Inserting the BNX029-01 on the input side brought noise into compliance with the allowable value over the entire frequency band.
Conclusion
Noise due to switching by the DC-DC converter can be transmitted onto the DC line. This conductive noise can be suppressed by using a BNX series filter with a wide frequency band. The BNX series is a filter product that comprises an LC π-type filter as a single component, allowing noise countermeasures to be implemented quickly and using very limited space.
The following SMD/DIP type versions of BNX series products are available. Choose the one that best matches the usage environment and noise conditions.
Insertion Loss Characteristics
High insertion loss at wide frequency range.
| Part Number | Type and Appearance | Rated Voltage (Vdc) | Rated Current (Adc) | Insertion Loss (dB) |
|---|---|---|---|---|
| BNX002-11 |
Standard Type  W12 x D11 x H12.5 / H13 |
50 | 10 |
40dB min. 1MHz to 1GHz |
|
BNX003-11 High Rated Voltage |
150 | 10 |
40dB min. 5MHz to 1GHz |
|
|
BNX005-11 High Rated Voltage |
50 | 15 |
40dB min. 1MHz to 1GHz |
|
| BNX012-01 |
Lower Profile
 W12 x D11 x H8
|
50 | 15 |
40dB min. 1MHz to 1GHz |
|
BNX012H01 Automotive |
50 | 15 |
40dB min. 1MHz to 1GHz |
|
| BNX016-01 | 25 | 15 |
40dB min. 100kHz to 1GHz |
|
| BNX022-01L |
SMD Type  L12.1 x W9.1 x T3.1 /T3.5 |
50 | 20 |
35dB min. 1MHz to 1GHz |
| BNX023-01L | 100 | 20 |
35dB min. 1MHz to 1GHz |
|
|
BNX024H01L Automotive |
50 | 20 |
35dB min. 100kHz to 1GHz |
|
|
BNX025H01L Automotive |
25 | 20 |
35dB min. 50kHz to 1GHz |
|
|
BNX026H01L Automotive |
50 | 20 |
35dB min. 50kHz to 1GHz |
|
|
BNX027H01L Automotive |
16 | 20 |
35dB min. 40kHz to 1GHz |
|
| BNX028-01L | 16 | 20 |
35dB min. 30kHz to 1GHz |
|
| BNX029-01L | 6.3 | 20 |
35dB min. 15kHz to 1GHz |
BNX029-01L Specifications
- Attributes
- Property Value
- Manufacturer
- Murata Electronics
- Series:
- EMIFIL®, BNX
- Package/Case:
- 4-SMD, No Lead
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Low Pass
- Filter Order:
- 5th
- Technology:
- LC
- Number of Channels:
- 2
- Center / Cutoff Frequency:
- -
- Attenuation Value:
- 35dB @ 15kHz ~ 1GHz
- Resistance - Channel (Ohms):
- 0.00043
- Current:
- 20 A
- Values:
- C = 100µF
- ESD Protection:
- No
- Operating Temperature:
- -40°C ~ 125°C
- Applications:
- Data Lines for Mobile Devices
- Voltage - Rated:
- 6.3V
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Size / Dimension:
- 0.476" L x 0.358" W (12.10mm x 9.10mm)
- Height:
- 0.146" (3.70mm)
- Category:
- Product information
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