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- Datasheet Download Datasheet
- Stock & Prices $ Price & Stock for MJE521
- Part Number MJE521
- Manufacturer onsemi
- Pin Count 1
- Part Category Transistor BJT NPN
- Package Category Other
- Pinout / Pin List Click Here (Member Only)
MJE521 Details
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Manufacturer Part Number:
MJE521
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Brand Name:
onsemi
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Pbfree Code:
No
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Part Life Cycle Code:
Obsolete
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Part Package Code:
TO-225
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Package Description:
PLASTIC, CASE 77-09, TO-225, 3 PIN
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Pin Count:
3
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Manufacturer Package Code:
77-09
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ECCN Code:
EAR99
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Manufacturer:
onsemi
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YTEOL:
0
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Collector Current-Max (IC):
4 A
MJE521 Frequently Asked Questions (FAQs)
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The maximum safe operating area (SOA) for the MJE521 is not explicitly stated in the datasheet, but it can be estimated based on the device's thermal and electrical characteristics. A general rule of thumb is to limit the device to a maximum power dissipation of 1.5W at 25°C, and to ensure that the collector-emitter voltage and collector current do not exceed the maximum ratings simultaneously.
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To ensure the MJE521 is properly biased for linear operation, you should ensure that the base-emitter voltage (VBE) is between 0.6V and 0.8V, and that the collector-emitter voltage (VCE) is at least 1V greater than the base-emitter voltage. Additionally, the collector current should be limited to the recommended maximum value to prevent thermal runaway.
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The recommended heatsink for the MJE521 depends on the specific application and the maximum power dissipation required. However, a general rule of thumb is to use a heatsink with a thermal resistance of less than 10°C/W to ensure that the device operates within its safe operating area.
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Yes, the MJE521 can be used as a switch, but it is not recommended due to its relatively low current gain (hFE) and high saturation voltage (VCE(sat)). The MJE521 is better suited for linear amplifier applications where its high current capability and low noise figure are beneficial.
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To protect the MJE521 from electrostatic discharge (ESD), you should handle the device with anti-static precautions, such as using an anti-static wrist strap or mat, and ensure that the device is stored in an anti-static package. Additionally, you can add ESD protection circuits, such as a diode or resistor network, to the device's pins to prevent damage from static electricity.
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MJE521 Overview
Use the download button to access the MJE521 3D model. You can still request or build the schematic symbol and PCB footprint by using the respective build or request forms on this page.
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