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| PartNumber | MJE520 | MJE521 | MJE520K |
| Description | Bipolar Transistors - BJT 30Vcbo 30Vceo 4.0Vebo 3.0A 25W | Bipolar Transistors - BJT 40Vcbo 40Vceo 4.0Vebo 4.0A 40W | |
| Manufacturer | Central Semiconductor | Central Semiconductor | - |
| Product Category | Bipolar Transistors - BJT | Bipolar Transistors - BJT | - |
| RoHS | Y | Y | - |
| Technology | Si | Si | - |
| Mounting Style | Through Hole | Through Hole | - |
| Package / Case | TO-126-3 | TO-126-3 | - |
| Transistor Polarity | NPN | NPN | - |
| Configuration | Single | Single | - |
| Collector Emitter Voltage VCEO Max | 30 V | 40 V | - |
| Collector Base Voltage VCBO | 30 V | 40 V | - |
| Emitter Base Voltage VEBO | 4 V | 4 V | - |
| Maximum DC Collector Current | 7 A | 8 A | - |
| Minimum Operating Temperature | - 65 C | - 65 C | - |
| Maximum Operating Temperature | + 150 C | + 150 C | - |
| Series | MJE520 | MJE521 | - |
| Packaging | Bulk | Bulk | - |
| Brand | Central Semiconductor | Central Semiconductor | - |
| Continuous Collector Current | 3 A | 4 A | - |
| DC Collector/Base Gain hfe Min | 25 at 1 A, 1 V | 40 at 1 A, 1 V | - |
| Pd Power Dissipation | 25 W | 40 W | - |
| Product Type | BJTs - Bipolar Transistors | BJTs - Bipolar Transistors | - |
| Factory Pack Quantity | 1000 | 1000 | - |
| Subcategory | Transistors | Transistors | - |
| Part # Aliases | MJE520 PBFREE | MJE521 PBFREE | - |