ECS-21K-15A

Overview

The ECS-21K-15A is an active monolithic crystal filter manufactured by ECS Inc. It operates at a center frequency of 21.4 MHz with a bandwidth of 15 kHz. The component features a nominal impedance of 1.5 kOhms and an insertion loss of 1.5 dB. It utilizes the HC-49/U package for through-hole mounting and functions as a two-pole filter. The device supports an operating temperature range from -20°C to 70°C.

Feature Summary

• Two-pole monolithic crystal construction for precise signal filtering
• Low insertion loss characteristic ensuring efficient signal transmission
• Through-hole compatible HC-49/U package design

Applications

• Intermediate frequency (IF) stages in radio receivers
• Communication equipment requiring narrowband filtering
• Signal processing circuits in consumer electronics

Procurement Notes

Verify the specific datasheet version, as publication dates vary across sources. Confirm that the HC-49/U package dimensions match your PCB footprint requirements. Ensure the operating temperature range meets your environmental specifications. Check for any specific handling instructions regarding moisture sensitivity levels during assembly processes.

Selection Notes

Select this component when a fixed 21.4 MHz center frequency is required. The 15 kHz bandwidth suits applications needing moderate selectivity. Consider the 1.5 kOhm impedance for circuit matching. The through-hole format dictates board layout constraints compared to surface-mount alternatives.

Part Context

This part belongs to the ECS monolithic crystal filter series. These components integrate multiple resonators into a single ceramic package. They offer stability and reliability compared to discrete LC filters. The series provides various frequency options for different communication standards.

Replacement Considerations

Cross-reference with other 21.4 MHz monolithic crystals. Verify identical impedance and bandwidth specifications. Ensure mechanical compatibility with the HC-49/U footprint. Confirm electrical performance matches the original design requirements.