News
Development of chip ferrite beads and noise filters suitable for automotive electrical equipment
- Author:MURATA
- Release on:2021-01-04
1. R & D background
In recent years, the auto industry has*1Such as the high-functionalization of automobiles, the high-quality image quality of automotive cameras as sensors has been further developed, and various ECUs*2The connected vehicle network is more accurate than before. On the other hand, the wiring weight of network cables and power cables has also become a research topic. In order to reduce the weight, the PoC method (Power Over Coaxial) in which power is combined on the data transmission interface and transmitted by a coaxial cable is realized. . The PoC power supply combination line (bias T circuit) requires high-impedance, high-frequency, and high-current components. Our company has developed the BLM18DN series to meet this purpose.This product uses our company's magnetic material technology and internal electrode formation technology to achieve the characteristics and reliability necessary for a small noise filter suitable for automotive circuits.
2. Features of this research and development product
The detailed features are as follows.- Achieved high impedance characteristics in the 1GHz high frequency band
- Suitable for maximum rated current 1400mA
- Murata's magnetic material technology has achieved high frequency, high impedance and suitable for large current in a size of 1.6×0.8×0.95mm (length×width×height)
- 4 varieties according to customer needs
Table Noise Filter, Chip Ferrite Bead BLM18DN Series
| Name |
At 100MHz
impedance
(Ω)
|
At 1GHz
impedance
(Ω)
|
Maximum DC resistance
(Ω)
|
Rated current (mA) | |
| At 85°C | At 125°C | ||||
| BLM18DN151SH1 |
150 (±25%) |
400 (±30%) |
0.120 |
1400 |
900 |
| BLM18DN221SH1 |
220 (±25%) |
650 (±30%) |
0.210 |
1000 |
650 |
| BLM18DN381SH1 |
380 (±25%) |
1100 (±30%) |
0.325 |
850 |
550 |
| BLM18DN601SH1 |
600 (±25%) |
1500 (±30%) |
0.435 |
700 |
450 |
The applicable temperature range is -55～125℃
3. Future development
It is expected that the performance required for automotive electronic components will be further improved as automobiles become more functional and electrical equipment in the future. In the future, the company will continue to conduct research and development and launch products that are smaller and have guaranteed temperature characteristics to meet customer needs.| *1 |
Abbreviation for Advanced Driving Assistance System: Advanced Driving Assistance System | |
| *2 |
Abbreviation of Electronic Control Unit: electronic control unit of car |