START405TR

Overview

The START405TR is an NPN silicon RF transistor manufactured by STMicroelectronics in the SOT343 (SC-70) surface-mount package. It utilizes a proprietary third-generation bipolar process to deliver high gain and low noise performance comparable to GaAs devices. Key electrical specifications include a collector-emitter breakdown voltage of 4.5V, a transition frequency of 42GHz, and a minimum noise figure of 1.1dB at 1.8GHz. The device operates with a maximum collector current of 10mA and total power dissipation of 45mW.

Feature Summary

• Ultra-miniature SOT343 package for compact circuit integration
• High transition frequency of 42GHz for wideband operation
• Low noise figure optimized for sensitive signal reception
• Proprietary bipolar process ensuring high gain-to-noise ratio

Applications

• Low Noise Amplifier (LNA) for GSM/DCS systems
• LNA for DECT, PCS, PCN, CDMA, and W-CDMA applications
• General purpose RF amplification from 500MHz to 5GHz

Procurement Notes

Verify component status as the datasheet explicitly marks the START405 series as obsolete. Confirm availability through authorized distributors or secondary market suppliers. Ensure the ordering code matches the required tape and reel packaging format. Validate that the specific batch meets project requirements given the discontinued production status.

Selection Notes

Select this component for designs requiring ultra-low noise performance in a minimal footprint. The 4.5V breakdown voltage limits supply headroom compared to higher-voltage alternatives. Consider the 10mA maximum collector current when designing bias networks. Verify thermal management capabilities within the SOT343 package constraints for continuous operation.

Part Context

The START405 belongs to the START family of RF transistors designed to provide advanced silicon RF performance. This family targets applications previously dominated by Gallium Arsenide (GaAs) technology. The START405 specifically focuses on optimizing the trade-off between gain and noise figure for a given breakdown voltage.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the product is marked obsolete, alternative components must be sourced based on equivalent electrical parameters such as transition frequency, noise figure, and package type.