2N2221AUA

Single Bipolar Transistors Overview

The Microsemi 2N2221AUA is a silicon planar NPN switching transistor qualified under MIL-PRF-19500/255. It operates with a collector-emitter voltage of 50 Vdc and a collector current of 800 mAdc. The device dissipates up to 0.5 W at +25°C ambient temperature, with a junction-to-ambient thermal resistance of 210 °C/W. It supports an operating and storage temperature range from -65°C to +200°C. The UA variant utilizes a surface-mount package configuration.

Single Bipolar Transistors Feature Summary

• Qualified per MIL-PRF-19500/255 for high-reliability applications
• Utilizes silicon planar technology for robust switching performance
• Features hermetic surface-mount packaging suitable for harsh environments

Single Bipolar Transistors Applications

• High-reliability aerospace systems
• Military-grade electronic circuits
• Harsh environment switching applications

Single Bipolar Transistors Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact qualification level and package type. Ensure compliance with export control regulations as indicated in distributor listings. Confirm that the procurement channel provides valid traceability documentation required for defense or aerospace supply chains.

Single Bipolar Transistors Selection Notes

Select this component when a radiation-hardened or high-reliability NPN switching transistor is required for mission-critical designs. Compare the 210 °C/W thermal resistance against system cooling capabilities. Verify that the surface-mount footprint matches the target PCB layout constraints compared to through-hole alternatives like the 2N2221A.

Single Bipolar Transistors Part Context

This device belongs to the 2N2221/2N2222 family of NPN silicon switching transistors manufactured by Microsemi. The 'UA' suffix specifically designates the surface-mount package version within the JAN/JANTX/JANTXV/JANS qualification hierarchy defined by MIL-PRF-19500/255.

Single Bipolar Transistors Replacement Considerations

Direct replacements include other 2N2221AUA variants from different manufacturers meeting MIL-PRF-19500/255 specifications. Cross-reference pinouts and thermal characteristics carefully when substituting.