AT-41511-BLKG

Overview

The AT-41511-BLKG is a general-purpose NPN silicon bipolar transistor from the Avago Technologies AT-41511 series. It utilizes a self-aligned-transistor (SAT) process with a 10 GHz fT capability and features nitride passivation for surface protection. The device employs a 4-micron emitter-to-emitter pitch and a 14-finger interdigitated geometry to achieve low noise figures and moderate power handling. Designed for high-frequency applications, it operates optimally at bias supplies between 5 V and 8 V, while maintaining performance at 2.7 V. Key electrical characteristics include a collector-emitter voltage of 12 V, a continuous collector current of 50 mA, and a maximum power dissipation of 225 mW.

Feature Summary

• Optimized for low noise figure and high associated gain in RF front-end circuits
• Utilizes a self-aligned-transistor process for excellent device uniformity and reliability
• Compatible with standard high-volume surface mount assembly techniques

Applications

• Wireless systems as a Low Noise Amplifier (LNA)
• RF gain stages and buffer amplifiers
• Oscillators and active mixers

Procurement Notes

Verify the specific ordering suffix BLKG corresponds to bulk packaging containing 100 devices per unit. Confirm RoHS compliance status through official manufacturer documentation before finalizing procurement plans. Ensure the component matches the required SOT-143 package dimensions for PCB layout compatibility.

Selection Notes

Select this component when designing circuits requiring an NPN transistor with superior high-frequency performance and low noise characteristics. The device is particularly suitable for designs operating near 900 MHz where impedance matching and minimal signal degradation are critical requirements.

Part Context

This part belongs to the AT-41511/AT-41533 family of general-purpose NPN bipolar transistors. While the AT-41533 utilizes a three-lead SOT-23 package, the AT-41511 variant places the same die into a four-lead SOT-143 package to reduce parasitic effects. Both share identical internal die specifications and fabrication processes.

Replacement Considerations

The AT-41533 serves as a functional equivalent within the same family, sharing identical electrical parameters but differing only in the SOT-23 package configuration.