STMicroelectronics

EMIF04-EAR02M8

EMIF04-EAR02M8 Description

The EMIF04-EAR02M8 from STMicroelectronics is a compact, surface-mount EMI/RFI filter designed for audio applications, combining 2nd/3rd-order low-pass filtering with ESD protection. This 4-channel filter utilizes a hybrid LC (Pi) and RC (Pi) topology, offering cutoff frequencies of 60MHz and 70MHz, optimized for suppressing high-frequency noise in sensitive audio circuits. Its miniature footprint (1.70mm x 1.50mm, 0.65mm height) makes it ideal for space-constrained designs. Key passive components include 68Ω resistors, 76pF/105pF capacitors, and 1.5nH inductors, ensuring balanced attenuation. Though obsolete, it remains RoHS3 compliant and REACH unaffected, with a 50mA current rating and MSL 1 (unlimited) moisture sensitivity.

EMIF04-EAR02M8 Features

• Dual Topology: Combines LC (Pi) and RC (Pi) networks for flexible noise suppression.
• ESD Protection: Integrated shielding enhances reliability in ESD-prone environments.
• High-Frequency Attenuation: 60MHz/70MHz cutoff targets RF interference in audio signals.
• Ultra-Compact: 0201-sized SMD package (1.7mm x 1.5mm) suits portable and high-density PCBs.
• Multi-Channel: 4-channel design reduces component count in multi-line systems.
• Robust Compliance: RoHS3, REACH, and EAR99 certifications ensure global usability.

EMIF04-EAR02M8 Applications

• Audio Interfaces: Filters noise in headphone jacks, microphones, and speakers (e.g., smartphones, headsets).
• Consumer Electronics: Protects I2S, PCM, or analog audio lines in wearables and IoT devices.
• ESD-Sensitive Systems: Shields ADC/DAC inputs in medical or industrial audio equipment.
• Automotive Infotainment: Mitigates conducted EMI in car audio subsystems.

Conclusion of EMIF04-EAR02M8

The EMIF04-EAR02M8 excels in high-frequency noise suppression for audio circuits, leveraging its LC/RC hybrid design and ESD resilience. While obsolete, its miniaturized form factor, multi-channel capability, and compliance make it a historical benchmark for compact EMI filtering. Engineers seeking legacy replacements should prioritize modern equivalents with similar cutoff frequencies and Pi-network topologies for audio-centric designs.