BETACollector limit60 V · VCEO magnitude
PNP metal-can power transistor
MJ2955 Specifications
Review MJ2955 electrical specifications, operating conditions and package details.
Key specifications
The mounting case is electrically live. The two silver leads are base and emitter; do not assume the case is ground.
Collector limit15 A · absolute
Case-cooled power115 W · case 25°C
Electrical terminals3 Two leads + collector case
Package details
MJ2955 · TO-204AA (TO-3)
| Property | Details |
|---|---|
| Manufacturer | onsemi |
| Part number | MJ2955 |
| Package | TO-204AA (TO-3) |
| Connections | 3 pins |
| Mounting | Through-hole |
| Lead pitch | 10.92 mm lead spacing |
| Package code | CASE 1-07 |
| Thermal reference | 115 W at case 25°C; heatsink required |
Device and package
Selected manufacturer reference
Manufacturer specifications 4 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Device | MJ2955 | onsemi complementary power transistor family |
| Polarity | PNP | Voltages and currents below use magnitudes |
| Physical connection | B1 · E2 · case C3 | Two insulated TO-3 leads; case is collector |
| Package | TO-204AA (TO-3) | CASE 1-07, style 1 |
No specifications match. Try a parameter name or a unit.
No unverified SMD substitute is selected.
Absolute limits
Do not combine maxima into one operating point
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Collector-emitter VCEO | 60 V | Open base |
| Collector-emitter VCER | 70 V | 100 Ω base-emitter resistor |
| Collector-base voltage | 100 V | Absolute maximum |
| Emitter-base reverse voltage | 7 V | Absolute maximum |
| Collector / base current | 15 A / 7 A | Absolute maximum |
| Dissipation | 115 W at case 25°C | Derate 0.657 W/°C |
| Junction / storage | −65 to +200°C | Absolute limits |
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Apply the manufacturer safe operating area.
Electrical characteristics
25°C and stated manufacturer conditions
Manufacturer specifications 5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| DC gain at 4 A | 20–70 | VCE magnitude 4 V |
| DC gain at 10 A | 5 minimum | VCE magnitude 4 V |
| Saturation at 4 A / 400 mA base | 1.1 V maximum | Case 25°C |
| Saturation at 10 A / 3.3 A base | 3 V maximum | Case 25°C |
| Base-emitter on voltage | 1.5 V maximum | IC magnitude 4 A; VCE magnitude 4 V |
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PNP test currents and voltages are negative in the source; magnitudes are shown.
Thermal and package data
Case and ambient conditions differ
Manufacturer specifications 4 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Junction-to-case | 1.52°C/W maximum | Controlled case |
| Mounting centres | 30.15 mm | Collector case |
| Base/emitter spacing | 10.92 mm | CASE 1-07 |
| Lead diameter | 0.97–1.09 mm | Two insulated leads |
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The authored footprint is a starting pattern, not a manufacturer land recommendation.
Calculated switch readings
Explicit low-current teaching assumptions
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Supply and load | 12 V / 100 Ω ≥3 W | Resistive load |
| Buffered driver | 12 V off / 7 V on | 330 Ω base resistor |
| Base-emitter return | 10 kΩ | Defined off state |
| Assumed junction drops | |VBE| 0.8 V / |VCE| 0.2 V | Illustrative only |
| Collector / base current | 118 mA / 12.65 mA | Includes base-return current |
| Device / load power | 33.7 mW / 1.392 W | Includes base-emitter input power |
No specifications match. Try a parameter name or a unit.
Do not infer high-current capability from this small example.
Connections by function
Select a pin for its function, connection guidance and electrical notes.