AT-41533-BLKG

Overview

The AT-41533-BLKG is a general-purpose NPN silicon bipolar transistor from Broadcom Limited, housed in a 3-lead SOT-23 surface-mount package. It utilizes Avago’s 10 GHz fT Self-Aligned-Transistor (SAT) process with nitride passivation and gold metalization. Optimized for 5V to 8V bias supplies, it also performs well at 2.7V. At 900 MHz with VCE=5V and IC=5mA, it achieves a typical noise figure of 1 dB and associated gain of 14.5 dB. The device supports 3, 5, and 8 volt characterization and offers an optimum noise match near 50 ohms.

Feature Summary

• Utilizes 10 GHz fT self-aligned-transistor (SAT) fabrication process with nitride passivation
• Features 14 emitter finger interdigitated geometry for low noise and moderate power
• Optimized for high-frequency performance across 3, 5, and 8 volt bias supplies
• Provides excellent impedance matching characteristics for low-noise amplifier applications

Applications

• Low-noise amplifiers (LNA) in wireless systems
• RF gain stages
• Signal buffers
• Oscillators
• Active mixers

Procurement Notes

Verify the BLKG suffix indicates bulk packaging containing 100 devices per unit. Confirm RoHS compliance status and ensure the component matches the specified SOT-23 plastic package dimensions. Cross-reference the manufacturer's current product status as this series may be obsolete.

Selection Notes

Select the AT-41533 when a 3-lead SOT-23 package is required instead of the 4-lead SOT-143 variant. Ensure the design accommodates the specific parasitic differences between the packages. Verify that the application operates within the characterized voltage ranges of 3V, 5V, or 8V for optimal performance.

Part Context

This component belongs to the AT-415xx series of general-purpose NPN bipolar transistors. It shares the same die structure as the AT-41511 but differs in packaging. The series is designed for economical high-frequency performance using advanced SAT processing techniques suitable for mass production.

Replacement Considerations

The AT-41511 serves as a functional equivalent utilizing the same die in a 4-lead SOT-143 package. Designers must account for the lower parasitics of the SOT-143 when substituting.