LS3550A TO-78 6L

Overview

The LS3550A is a monolithic dual PNP transistor from Linear Integrated Systems, housed in a 6-lead SOT-23 surface mount package. It features tight base-to-emitter voltage matching of 2mV to 5mV at -100µA and excellent thermal tracking with a differential change of 3µV/°C. The device supports a collector current up to 50mA and withstands a collector-to-collector voltage of ±60V. Key electrical characteristics include a DC current gain (hFE) ranging from 150 to 100 at -1mA, a gain-bandwidth product of 600MHz, and an output capacitance of 2pF.

Feature Summary

• Monolithic dual PNP configuration ensuring high precision through tight base-to-emitter voltage matching.
• Excellent thermal tracking capability for stable performance across temperature variations.
• High-speed operation supported by a 600MHz gain-bandwidth product.

Applications

• Precision analog signal processing circuits
• Low-noise amplifier stages
• Instrumentation requiring matched transistor pairs

Procurement Notes

Verify the specific suffix 'TO-78 6L' against the official datasheet documentation. The provided source material explicitly lists SOT-23, PDIP, SOIC, TO-71, and TO-92 packages but does not confirm the existence or specifications of a TO-78 variant for this part number. Ensure the ordering code matches the manufacturer's current valid nomenclature to avoid compatibility issues.

Selection Notes

Select the LS3550A when precise matching between two PNP transistors is required within a compact footprint. The tight voltage differential and low thermal drift make it suitable for applications where temperature stability directly impacts circuit accuracy. Consider the 600MHz bandwidth for high-frequency signal handling requirements.

Part Context

This component belongs to the LS3550 series of monolithic dual and single PNP transistors manufactured by Linear Integrated Systems. The series offers various package options including SOT-23, PDIP, and SOIC to accommodate different mounting needs while maintaining consistent electrical performance characteristics across the lineup.

Replacement Considerations

Public confirmed substitute part numbers are not available in the verified documentation.

FAQ

What is the maximum collector-to-collector voltage rating?

The LS3550A can withstand a collector-to-collector breakdown voltage of ±60V under specified conditions.

How does the base-to-emitter voltage differential vary with temperature?

The base-to-emitter voltage differential changes with temperature at a rate of 3µV/°C for the LS3550A.

What is the typical noise figure for this device?

The narrow band noise figure is typically 3dB when operating at -100µA collector current and -5V collector-emitter voltage.