Tokyo, Japan − TDK Corp. claims the industry’s smallest common-mode choke for automotive Ethernet applications with the best common-mode noise suppression. The ACT45L series has a 4.5- x 3.2-mm footprint and an insertion height of 2.8 mm.
Ethernet, which supports data rates of up to 100 Mbit/s, is becoming the networking protocol of choice for high-speed multimedia infotainment applications in cars, said TDK. One of the key reasons is because it uses lightweight unshielded twisted-pair (UTP) wires, which saves space and weight in the automobiles.
However, the specifications of the new automotive Ethernet standard in terms of common-mode noise suppression are significantly more demanding than the requirements of CAN and FlexRay, said TDK. The noise suppression of the ACT45L is 15 dB to 25 dB better than existing products over a broad frequency range up to 100 MHz, according to TDK, which it attributes to its advanced technologies.
“The higher the attenuation of the noise is, the better the performance of the common-mode choke,” said TDK
Key specs of the ACT45L-201-2P:
- Common-mode inductance @ 100 MHz [µH]: 200
- Typ. insulation resistance [MΩ]: 4.5
- Rated current max. [mA DC]: 100
- Rated voltage max. [V DC]: 50
The ACT45L series is designed to be manufactured using fully-automated processes that include a high-precision auto-winding process and the bonding of ferrite cores with a highly temperature- and moisture-resistant adhesive. The series is automotive components qualified to AEC-Q200.
Target applications for automotive Ethernet systems include in-vehicle multimedia and infotainment such as cameras for driver assistance, navigation systems and audio information applications
Availability: Mass production starts in November 2013.