Specs side by side
2 parts compared · 14 differing specs across 14 total parameters.
| Parameter | ||
|---|---|---|
| Supply voltage | - | Identical 60V VCEO class: the plastic move modernizes the package, not the voltage ceiling. |
| Memory & Peripherals | - | The mechanical truth: a TO-3 socket and a TO-247 through-hole land are different builds - this is a board modification with a dissipation re-check, not a plug-in. |
| Case | TO-3 (TO-204AA) | TO-247 (formerly TO-218 / SOT-93) |
| Compatibility Level | - | Functional Equivalent |
| Component Category | Power Bipolar Transistors (Linear / Audio) | - |
| Core & Architecture | - | The plastic modernization of the pair: same 60V / 15A class, 90W dissipation against the 115W of the metal can, thermal resistance about 1.39 K/W against 1.5 - and the same rule that the tab carries the collector. |
| Firmware Notes | - | The dissipation arithmetic after the swap: 25W less headroom in the package plus a different mounting thermal path. In pass-bank and audio duty the heatsinking is re-engineered at the same time as the part is fitted. |
| Hardware Notes | - | Pinout 1 base, 2 collector (the tab), 3 emitter - tab live, as on the TO-3 can. |
| Lead Time Advantage | - | Shenzhen Spot Stock (24-48h Dispatch) |
| Market Reality | The 2N3055 NPN and its MJ2955 PNP complement are the linear power pair that ran regulator pass banks, audio output stages and industrial drive circuits for half a century: 60V, 15A, 115W in the TO-3 metal can whose body IS the collector. The family survives in original metal, in the plastic modernization (TIP3055 / TIP2955 in TO-247 at 90W) and in the modern higher-grade parts (2SC5200 / 2SA1943 class) - and the substitution traps scale with age: a mounting change disguised as an electrical equivalent, a dissipation derate hidden in the package, and a re-marking market that has targeted this exact can for decades. | - |
| Reference Part | - | 2N3055 / MJ2955 |
| Role In Circuit | Original Reference Part | - |
| Sourcing Advantage | - | Continuous production; the practical modern drawing-board answer. |
| Sourcing Status | Active Shenzhen Spot Sourcing (24–48h) | - |
Parts
- 2N3055 / MJ2955 · stmicroelectronics
- TIP3055 / TIP2955 · onsemi