EZA-ST21AAAJ

Overview

The Panasonic EZA-ST21AAAJ is a surface-mount RC network designed for EMI/RFI filtering applications. It features four isolated channels, each comprising a 47 Ohm resistor and a 22 pF capacitor. The component operates within a voltage rating of 25 V DC and supports an operating temperature range from -25°C to +85°C. Housed in a compact 1608 (4021 Metric) package with concave terminals, it measures 4 x 2.1 x 0.65 mm. Capacitance tolerance is specified as -20% to +30%, while resistance tolerance is ±5%. This configuration functions as a fourth-order low-pass filter.

Feature Summary

• Integrates four independent RC filter channels within a single compact surface-mount package
• Designed specifically for EMI and RFI suppression in signal lines
• Utilizes concave wrap-around terminals to enhance solder joint reliability during reflow processes

Applications

• High-speed data line filtering in consumer electronics
• Signal conditioning in automotive infotainment systems
• Noise reduction in industrial control interfaces

Procurement Notes

Verify the specific suffix against official Panasonic documentation to confirm terminal shape and capacitance values. Confirm availability status as distribution listings may vary. Ensure the selected variant matches the required isolation type and thermal specifications for the target application environment before finalizing procurement.

Selection Notes

Select this component when space-constrained designs require multi-channel filtering without increasing board footprint. The 1608 package size suits dense PCB layouts. Verify that the 25V rating and temperature range meet system requirements. Consider the -20/+30% capacitance tolerance for precise filter cutoff frequency calculations.

Part Context

This part belongs to the Panasonic EZA series of chip RC networks. These components are engineered to replace discrete resistor-capacitor assemblies, reducing assembly time and improving consistency in high-volume manufacturing. The series offers various configurations to address different filtering needs in modern electronic devices.

Replacement Considerations

Check Panasonic's official discontinuation notices. If obsolete, consult the manufacturer for recommended alternatives or last-time buy options. Do not substitute with generic RC networks without verifying electrical equivalence and mechanical compatibility.