SI4311-B21-GM

RF Receivers Overview

The SI4311-B21-GM is a fully integrated FSK CMOS RF receiver designed for the unlicensed 433.92 MHz ultra high frequency band. It operates within a supply voltage range of 2.7 V to 3.6 V and consumes 20 mA of working power current. The component supports an operating temperature range from -40°C to +85°C. It is housed in a QFN-20 package with dimensions of 3 mm x 3 mm x 0.85 mm, utilizing SMD/SMT installation style. This silicon-based device is part of the Si4311 series and is classified as obsolete.

RF Receivers Feature Summary

• Fully integrated FSK CMOS architecture for UHF reception
• Optimized for 433.92 MHz unlicensed band operation
• Low power consumption design suitable for battery applications

RF Receivers Applications

• Wireless remote control systems
• Security alarm sensors
• Industrial telemetry monitoring

RF Receivers Procurement Notes

This component is officially designated as End of Life (EOL) by Silicon Labs. No new production units are available. Existing inventory is limited and subject to availability constraints. Verification of stock status through authorized distributors is required before procurement attempts. Last time buy opportunities may have expired based on historical notifications.

RF Receivers Selection Notes

Engineers must evaluate alternative components due to the obsolete status of this specific part number. Compatibility checks should focus on pinout alignment and electrical parameter matching with successor devices. Design modifications may be necessary to accommodate different package types or updated feature sets found in newer generation receivers.

RF Receivers Part Context

The SI4311-B21-GM belongs to the Si4311 family of sub-GHz receivers manufactured by Silicon Labs. This series targets cost-sensitive wireless applications requiring reliable FSK demodulation. The B21 suffix specifically denotes the 433.92 MHz frequency variant. The product line has been superseded by newer integrated solutions offering enhanced performance.

RF Receivers Replacement Considerations

Public documentation identifies the SI4355-C2A-GM as a similar substitute option. Engineers should verify functional equivalence and interface compatibility when transitioning to replacement parts.