ECS-21K-30B

Overview

The ECS-21K-30B is a monolithic crystal filter manufactured by ECS Inc. International, designed for through-hole mounting in the UM-1 package. It operates at a center frequency of 21.4 MHz with a bandwidth of 30 kHz and an insertion loss of 2 dB. The component features a nominal impedance of 1.8 kOhms and supports up to 4 poles. It functions within an operating temperature range of -20°C to +70°C.

Feature Summary

• Monolithic construction providing stable filtering characteristics
• Through-hole mounting capability for standard PCB integration
• Defined 30 kHz bandwidth centered at 21.4 MHz

Applications

• Intermediate frequency (IF) filtering in communication receivers
• Signal processing circuits requiring precise frequency selection
• Electronic equipment operating within industrial temperature ranges

Procurement Notes

Verify the specific datasheet version from ECS Inc. International to confirm mechanical dimensions and electrical tolerances. Ensure the UM-1 footprint matches the target PCB design. Confirm that the 21.4 MHz center frequency aligns with system requirements before procurement.

Selection Notes

Select this component when a fixed 21.4 MHz bandpass response is required. Consider the 1.8 kOhm impedance for circuit matching. Verify that the -20°C to +70°C temperature range meets environmental specifications. Compare pole count against filter steepness needs.

Part Context

This part belongs to the ECS monolithic crystal filter series. These components are engineered for applications demanding high stability and compact size compared to discrete LC filters. The UM-1 package offers a standardized form factor for automated assembly processes.

Replacement Considerations

Cross-reference with other 21.4 MHz monolithic filters from ECS or competitors. Verify pinout compatibility and impedance matching. Check if alternative packages like SMD are available if space constraints change.