In the complex world of electronic devices, electromagnetic interference (EMI) can pose significant challenges. The CSPEMI400, developed by ON Semiconductor, is a specialized integrated circuit designed to tackle these issues head - on. It belongs to the category of EMI/RFI filter arrays, playing a crucial role in ensuring the smooth operation of electronic systems by reducing unwanted EMI.
Description CSPEMI400
The CSPEMI400G is an EMI filter array with ESD protection. It incorporates 3 EMI filtering channels (each with ESD protection) and 2 additional ESD protection - only channels. It features ESD protection of ±10kV (IEC 61000 - 4 - 2) and ±25kV (HBM). The attenuation at 1GHz exceeds 30dB. It adopts a 10 - bump 1.960x1.330mm CSP package, is lead - free and RoHS - compliant, and is suitable for applications like SIM card slots in mobile devices.
CSPEMI400 Pin Details
| Type |
Pin |
Description |
| EMI Filter |
A1 |
EMI Filter with ESD Protection for RST Signal |
| |
C1 |
EMI Filter with ESD Protection for RST Signal |
| EMI Filter |
A2 |
EMI Filter with ESD Protection for CLK Signal |
| |
C2 |
EMI Filter with ESD Protection for CLK Signal |
| Device Ground |
B1 |
Device Ground |
| |
B2 |
Device Ground |
| EMI Filter |
A3 |
DAT EMI Filter with ESD Protection |
| |
C3 |
DAT EMI Filter with ESD Protection |
| ESD Channel |
A4 |
ESD Protection Channel – VCC Supply |
| |
C4 |
ESD Protection Channel |
CSPEMI400 Features
3+2 protection architecture: 3 independent EMI filtering channels (C-R-C, 100Ω/47Ω resistors) + 2 pure ESD protection channels, fully covering SIM card RST/CLK/DAT signals and VCC power supply.
High ESD protection: ±10kV contact discharge (IEC 61000-4-2), ±25kV Human Body Model (HBM), meeting harsh electrostatic environments.
Efficient filtering: >30dB attenuation at 1GHz, cutoff frequency 77-85MHz, suppressing bidirectional interference from high-frequency noise.
Ultra-small package: 1.96×1.33mm 10-bump CSP (WLCSP10), suitable for compact spaces (such as mobile phone SIM card slots).
Reliable and compliant: wide temperature operation from -40℃ to +85℃, lead-free/RoHS certification, integrated with bidirectional ESD diodes (clamping voltage ±12V/-7V).
CSPEMI400G Electrical Schematic
The CSPEMI400G Electrical Schematic consists of four signal channels with integrated EMI filtering and ESD protection. Channels A1 - C1 and A3 - C3 use 100Ω resistors (R₁), while A2 - C2 employs a 47Ω resistor (R₂). Each channel includes capacitors (C) and bidirectional ESD diodes, forming C - R - C networks to filter noise and block electrostatic surges. The A4 - C5 channel, without a series resistor, relies on capacitors and ESD diodes for pure electrostatic protection. Terminals B1/B2 connect to GND, providing a common ground for ESD clamping. This design combines EMI attenuation (＞30dB at 1GHz) and high ESD immunity (±10kV contact, ±25kV HBM), ensuring signal integrity for interfaces like SIM cards by suppressing interference and safeguarding against electrical transients.
Typical Application Diagram for the SIM Card Interface
This is a typical application diagram of the SIM card interface. The core components include a controller with a logic level translator, CSPEMI400 (featuring both EMI filtering and ESD protection), and a SIM card connector. The controller outputs RST, CLK, and Data I/O signals, which pass through the corresponding channels of CSPEMI400 (100Ω and 47Ω resistors paired with ESD diodes) to achieve noise filtering and electrostatic protection. On the power supply side, a 1μF decoupling capacitor is connected between CSPEMI400 and the VCC (compatible with 5V/3.3V/1.8V) of the connector to stabilize the power supply, and the GND is common ground. The channel of CSPEMI400 with a Zener diode is not shown in the diagram. The entire architecture ensures the signal integrity and anti - interference capability of SIM card communication.
CSPEMI400 Package
CSPEMI400 adopts a CSP (Chip - Scale Package). It includes a Top View (Bumps Down View, with bumps facing downward, featuring an orientation marker “+” and the marking “AG”) and a Bottom View (Bumps Up View, with bumps facing upward, where pins are labeled C1 - C4, B1, B2, A1 - A4, and the model number “CSPEMI400G” is marked). For lead - free devices, the “+” character on the top serves as the orientation marker, clarifying the package pin layout and identification specifications.
CSPEMI400 Applications
- Mobile device interface protection: Applied to the I/O ports of mobile phones, laptops, PDAs, etc. Via EMI filtering and ESD protection, it resists electrostatic discharge and noise interference, ensuring signal transmission.
- SIM card slot integration: Suited for mobile phone SIM card interfaces. It filters signal noise like RST, CLK, and DAT, while protecting against electrostatic shocks to maintain communication stability.
- EMI optimization for data ports: Deployed in various data transmission ports. Leveraging its C-R-C filtering network, it suppresses high-frequency interference and ensures signal integrity.
CSPEMI400 Manufacturer
CSPEMI400 is manufactured by onsemi (ON Semiconductor). As a globally renowned semiconductor solutions provider, onsemi focuses on areas such as power management and signal processing, and excels in electromagnetic compatibility (EMC) and electrostatic discharge (ESD) protection technologies.
CSPEMI400 integrates multi - channel EMI filtering (＞30dB attenuation at 1GHz) and high - level ESD protection (±10kV contact discharge, ±25kV Human Body Model (HBM)). It is suitable for scenarios such as mobile device I/O and SIM card interfaces, suppressing noise and ensuring signal integrity through C - R - C networks.
Leveraging strict quality control, RoHS - compliant design, and a compact CSP package, onsemi provides efficient electromagnetic interference suppression and ESD protection solutions for end - devices, supporting the stable operation of consumer electronics and communication equipment, and demonstrating technological accumulation and market value in the semiconductor niche.
CSPEMI400 Category-EMI filter array
EMI filter arrays are pivotal in electronic systems, tackling electromagnetic interference (EMI) to safeguard signal integrity. By integrating multi - channel filtering, they suppress noise across frequencies, block electrostatic discharges (ESD), and adapt to diverse interfaces like I/O ports or communication lines. In mobile devices, automotive electronics, and industrial setups, these arrays balance compactness and performance, merging passive components (capacitors, resistors) with ESD protection.
CSPEMI400 exemplifies such innovation: its multi - channel design (with C - R - C networks) delivers ＞30dB attenuation at 1GHz, paired with robust ESD defense (±10kV contact, ±25kV HBM). Housed in a tiny CSP package, it excels in space - constrained applications like SIM card interfaces—filtering RST/CLK signals while resisting transients. As a bridge between EMI mitigation theory and real - world device stability, CSPEMI400 showcases how advanced filter arrays empower reliable, interference - free electronics.
Conclusion
The CSPEMI400 is a versatile and essential component in the world of electronics. Its ability to filter out EMI, protect against ESD, and operate in a wide temperature range makes it suitable for a diverse range of applications. Whether in mobile devices, consumer electronics, or industrial and automotive systems, the CSPEMI400 plays a vital role in ensuring the reliable and efficient operation of electronic circuits by reducing the impact of unwanted electromagnetic interference. As electronic devices continue to become more complex and compact, the importance of components like the CSPEMI400 in maintaining signal integrity and system performance will only increase.
CSPEMI400, a 3+2 protection architecture EMI filter and ESD protection device, is available in large stock at WlS Electronic. It is a high-performance solution for reliable EMI filtering and ESD protection in signal and power interfaces, ideal for SIM card slots, mobile devices, and industrial terminals. Sourced directly from leading manufacturers, all components are guaranteed genuine and brand-new, with strict quality assurance processes to ensure stable performance in various applications (such as resisting high-frequency noise interference and electrostatic damage). For technical support, detailed datasheets and application notes (such as SIM card interface protection designs, mobile device EMI suppression solutions) are available upon request.
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