BETACollector limit−100 V · absolute VCEO
PNP power transistor
TIP42C Specifications
Review TIP42C electrical specifications, operating conditions and package details.
Key specifications
The 6 A limit requires adequate base drive and cooling. The saturation test uses 600 mA base current; the 65 W power rating assumes a case held at 25°C.
DC collector limit6 A magnitude · thermal limits apply
DC gain minimum30 IC 0.3 A · VCE 4 V magnitudes
Junction limit150 °C · absolute
Package details
TIP42C · TO-220AB
| Property | Details |
|---|---|
| Manufacturer | onsemi |
| Part number | TIP42C |
| Package | TO-220AB |
| Connections | 3 pins |
| Mounting | Through-hole |
| Lead pitch | 2.54 mm nominal |
| Package code | TO220B03 Rev. 8 |
| Thermal reference | 65 W at case 25°C; 2 W at ambient 25°C |
Device and package scope
Archived manufacturer reference
Manufacturer specifications 5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Selected device | TIP42C · TO-220 | onsemi TIP42C/D Rev. 2, November 2017 |
| Polarity | PNP | Electrical values below are magnitudes |
| Terminals | B1 · C2 · E3 | Metal tab is collector |
| Package drawing | TO220B03 Rev. 8 | Two supplier body shapes are documented |
| Availability | Archived reference | Verify current sourcing separately; no unverified SMD substitute is offered |
No specifications match. Try a parameter name or a unit.
The source is explicitly retained as a legacy reference.
Absolute maximum ratings
Individual stress limits, not operating targets
Manufacturer specifications 5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Collector-emitter / collector-base | 100 / 100 V | C-voltage grade |
| Emitter-base reverse limit | 5 V | Do not overdrive the reverse base junction |
| DC / pulse collector current | 6 / 10 A | Pulse duration and safe operating area apply |
| Base current | 2 A | Absolute maximum |
| Junction maximum | 150°C | Storage −65 to +150°C |
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Thermal limits may restrict current well below the headline rating.
Gain and conduction
25°C; pulse ≤300 µs and duty ≤2%
Manufacturer specifications 5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| hFE at IC 0.3 A | 30 minimum | VCE 4 V |
| hFE at IC 3 A | 15–75 | VCE 4 V |
| Collector-emitter saturation | 1.5 V maximum | IC 6 A; IB 600 mA |
| Base-emitter on voltage | 2 V maximum | IC 6 A; VCE 4 V |
| Gain-bandwidth product | 3 MHz minimum | IC 500 mA; VCE 10 V; f 1 MHz |
No specifications match. Try a parameter name or a unit.
PNP voltage and current signs are negative in the manufacturer table; magnitudes are shown here.
Off-state limits
25°C maximum magnitudes
Manufacturer specifications 3 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Collector cutoff ICEO | 0.7 mA | VCE 60 V; IB 0 |
| Collector cutoff ICES | 400 µA | VCE 100 V; VEB 0 |
| Emitter cutoff IEBO | 1 mA | VEB 5 V; IC 0 |
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Temperature affects leakage.
Thermal and mechanical reference
Keep the boundary conditions explicit
Manufacturer specifications 6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Collector dissipation | 65 W | Case held at 25°C |
| Ambient dissipation | 2 W | Ambient 25°C |
| Safe operating area | See source curves | Check current, voltage and pulse width together |
| Lead pitch | 2.54 mm nominal | Drawing range 2.40–2.67 mm |
| Lead cross-section maximum | 1.00 × 0.60 mm | Below the stamped shoulder |
| Authored copper / hole | 2.2 / 1.3 mm | Verify fabrication and mechanical clearances |
No specifications match. Try a parameter name or a unit.
The package illustration does not imply a heatsink is present.
12 V resistor-load switch
Explicit illustrative assumptions
Manufacturer specifications 7 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Load | 100 Ω, at least 3 W | Collector to ground |
| Base resistor / return | 330 Ω / 10 kΩ | Return resistor goes from base to emitter |
| Buffered driver | 12 V off / 7 V on | Level-shifted; sinks base current |
| Assumed junctions | |VBE| 0.8 V; |VCE| 0.2 V | Teaching assumptions, not guaranteed test points |
| Base current | 12.65 mA | (5−0.8)/330−0.8/10000 |
| Collector current / forced ratio | 118 mA / 9.33 | (12−0.2)/100; IC/IB |
| Transistor / load loss | 33.7 mW / 1.392 W | Include base contribution; allow resistor thermal margin |
No specifications match. Try a parameter name or a unit.
Inductive loads require a suitable clamp and a separate transient check.
Connections by function
Select a pin for its function, connection guidance and electrical notes.