2SC4521S-TD-E

Single Bipolar Transistors Overview

The 2SC4521S-TD-E is an NPN silicon power bipolar transistor manufactured by onsemi. It features a maximum collector current of 3A and a collector-emitter breakdown voltage of 45V. The device utilizes a TO-243 plastic/epoxy package, also identified as SOT-89 in some documentation, with three pins and a rectangular small outline form factor. It operates at a maximum junction temperature of 150°C and offers a minimum DC current gain (hFE) of 100.

Single Bipolar Transistors Feature Summary

• High current handling capability for power switching applications
• Robust thermal performance with high maximum operating temperature
• Standardized surface-mount packaging for automated assembly

Single Bipolar Transistors Applications

• General-purpose power switching circuits
• Low-voltage amplifier stages
• DC-DC converter output stages

Single Bipolar Transistors Procurement Notes

Verify the specific manufacturer source, as the part number prefix may indicate distribution from ON Semiconductor or legacy Sanyo Semicon Device stock. Confirm the exact package marking and datasheet version to ensure compatibility with design specifications. Check for RoHS compliance status and lead-free certification if required for the target application environment.

Single Bipolar Transistors Selection Notes

Select this component for designs requiring moderate power dissipation in a compact surface-mount footprint. Ensure the circuit operates within the 45V collector-emitter voltage limit and 3A current rating. Consider thermal management requirements given the single-element silicon construction and plastic epoxy package constraints.

Single Bipolar Transistors Part Context

This transistor belongs to the family of general-purpose NPN power transistors often used in consumer electronics and industrial control systems. Originally associated with Sanyo's manufacturing lineage, these devices are now frequently cataloged under onsemi portfolios following corporate acquisitions. They serve as reliable replacements for older through-hole equivalents in space-constrained PCB layouts.

Single Bipolar Transistors Replacement Considerations

Direct substitutes include the 2SC4521R and generic TO-243/SOT-89 NPN transistors with matching 3A/45V ratings. Verify pinout compatibility and hFE binning before substitution.