ECS-21K-7.5B

Overview

The ECS-21K-7.5B is a monolithic crystal filter manufactured by ECS Inc. It operates at a center frequency of 21.4 MHz with a bandwidth of 7.5 kHz. The component features an insertion loss of 2.5 dB and a ripple of 1 dB. It has a nominal impedance of 850 Ohms and a load capacitance of 5 pF. The device is housed in a through-hole package, described variously as 3-pin SIP or HC-49/U style, and is rated for an operating temperature range of -20°C to 70°C.

Feature Summary

• Monolithic construction for compact integration
• Through-hole mounting capability
• RoHS compliant manufacturing

Applications

• Industrial automation signal processing
• Process automation control systems

Procurement Notes

Verify the specific pin configuration (3-pin vs 6-pin) and package type (SIP vs HC-49/U) against your PCB footprint requirements, as source documentation varies. Confirm the operating temperature range meets your environmental specifications. Ensure the 850 Ohm impedance matches your circuit design. Check for RoHS compliance if required by your assembly standards.

Selection Notes

Select this component when a 21.4 MHz center frequency with narrow 7.5 kHz bandwidth is required. Consider the 2.5 dB insertion loss and 850 Ohm impedance for matching network design. Evaluate the through-hole package constraints against available board space. Verify thermal performance within the -20°C to 70°C range for your specific application environment.

Part Context

This part belongs to the ECS monolithic crystal filter family. These components are designed for intermediate frequency (IF) filtering applications. They offer stable frequency response in a small form factor compared to discrete LC filters. The series supports various center frequencies and bandwidths for different communication and control needs.

Replacement Considerations

No public confirmed substitute part numbers are identified in the provided documentation.