SF2251E

Overview

The RFMi SF2251E is a surface-mount bandpass filter designed for signal conditioning applications. It operates within a frequency range of 1.58 GHz to 1.62 GHz, centered at 1.6 GHz. The component features a 40 MHz bandwidth and a 50 Ohms impedance. It has a voltage rating of 3 V and an insertion loss of 3.15 dB. The device utilizes SMD/SMT termination and is housed in the SM3 package. It supports board mounting and functions within a temperature range of -40°C to +90°C.

Feature Summary

• Provides precise signal filtering with high selectivity at the 1.6 GHz center frequency
• Maintains low insertion loss to enhance signal transmission efficiency
• Utilizes narrow bandwidth design for accurate frequency selection

Applications

• Wireless communication systems requiring 1.6 GHz band filtering
• RF signal conditioning circuits
• Transmitter frequency control elements

Procurement Notes

Verify the specific package variant (SM3) against your PCB footprint requirements before ordering. Confirm that the operating temperature range of -40°C to +90°C aligns with your environmental specifications. Ensure the 3 V voltage rating is sufficient for your circuit design. Cross-reference the datasheet for exact mechanical dimensions and soldering profiles to guarantee reliable assembly and long-term performance in your application.

Selection Notes

Select this component when a narrow 40 MHz bandwidth is required around the 1.6 GHz frequency. The 50 Ohms impedance matches standard RF system designs. Consider the SM3 package size for space-constrained layouts. The low insertion loss of 3.15 dB makes it suitable for applications where signal integrity is critical. Verify compatibility with your manufacturing process for surface-mount technology.

Part Context

The SF2251E belongs to the SF series of bandpass filters manufactured by RFMi. This series focuses on signal conditioning using SAW technology. The component is part of a broader portfolio of RF components designed for digital and wireless applications. RFMi, now part of Akoustis, specializes in frequency control elements for transmitters and receivers.

Replacement Considerations

Check for direct substitutes within the SF series or other SAW filters from RFMi/Akoustis with similar 1.6 GHz center frequencies and 40 MHz bandwidths. Ensure any replacement maintains the 50 Ohms impedance and compatible package dimensions.