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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

STMicroelectronics 2N6111

Name: 2N6111
Brand: STMicroelectronics
SKU: 2N6111
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2N6111

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: 2N6111.pdf

Description:: TRANS PNP 30V 7A TO-220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2N6111 from STMicroelectronics is a PNP silicon switching transistor in TO-220 package, rated for -30 V V_CEO, -7 A I_C, and 40 W P_tot at T_c = 25 °C. It delivers h_FE ≥ 30 at -3 A/-4 V and supports linear and medium-power switching in industrial power supplies and motor control stages.

For engineers reviewing the 2N6111 datasheet, 2N6111 pinout, 2N6111 application, or 2N6111 equivalent, key selection factors include its -40 V V_CBO, pulsed V_CE(sus) of -30 V, R_thj-case = 3.12 °C/W, guaranteed h_FE minimum at high current, and TO-220 thermal mounting compatibility.

Technical Context

The 2N6111 uses an epitaxial-base structure optimized for robust switching transitions and stable DC gain across temperature. Its -30 V V_CEO and -40 V V_CBO support operation in grounded-emitter configurations with moderate bus voltages, while the 3.12 °C/W junction-to-case thermal resistance enables direct heatsink mounting without thermal interface compromise.

It exhibits pulsed V_CE(sus) = -30 V at I_C = -0.1 A with zero base drive, and V_CE(sat) ≤ -1 V at I_C = -2 A / I_B = -0.2 A - confirming suitability for saturated-switching topologies requiring low conduction loss and predictable turn-off behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	-30 V - Maximum collector-emitter voltage with open base; defines safe blocking capability in common-emitter switch configurations.
I_C	-7 A - Continuous collector current rating at T_c = 25 °C; sets maximum load-handling capacity under heatsink-cooled conditions.
P_tot	40 W - Total power dissipation at case temperature 25 °C; determines thermal design margin before derating applies.
h_FE	30–150 - DC current gain range at -3 A/-4 V and -7 A/-4 V; ensures reliable base drive sizing across operating current.
R_thj-case	3.12 °C/W - Junction-to-case thermal resistance; enables calculation of junction temperature rise above heatsink temperature.
V_CE(sat)	≤ -1 V @ -2 A/-0.2 A - Saturation voltage under standard drive; directly impacts conduction loss and heat generation in on-state.
f_T	4 MHz - Transition frequency at -0.5 A/-4 V; indicates usable bandwidth for analog amplification or fast-switching edge control.

Pinout & Package

Package: TO-220 (3-lead, vertical mounting, metal tab connected to collector). Standard JEDEC outline with center tab electrically tied to collector terminal.

Pin/Terminal	Circuit Role	Design Meaning
Lead 1 (Left, viewing front)	Emitter	Current sink node; connects to system ground or negative rail in PNP switching configurations.
Lead 2 (Center)	Base	Control input; requires negative bias relative to emitter to forward-bias base-emitter junction.
Lead 3 (Right) + Tab	Collector	Main current path; electrically bonded to metal tab for direct thermal coupling to heatsink.

Key Features

Feature	Design Value
Epitaxial-base construction	Enables sharp saturation characteristics and consistent h_FE across production lots and temperature.
Pulsed sustaining voltage rating	V_CE(sus) = -30 V at I_C = -0.1 A confirms ruggedness against transient overvoltage during switching transitions.
Low R_thj-case	3.12 °C/W allows >12 W continuous dissipation even with modest heatsinking at 60 °C ambient.
Guaranteed h_FE min at high current	h_FE ≥ 30 at -3 A ensures predictable base drive requirements in power-stage designs.

Applications

Industrial DC Power Supplies

Motor Drive Half-Bridge Legs

Use Scenario: Regulating 24–48 V DC output in offline SMPS using linear pass or quasi-resonant topologies.

IC Role / Device Role / Timing Role: PNP switching transistor used as series pass element or synchronous rectifier driver stage.

Use Value: -30 V V_CEO and -7 A I_C support mid-range industrial supply loads; TO-220 package simplifies mechanical integration with chassis-mounted heatsinks.

Use Scenario: Driving gate of N-channel MOSFETs or controlling current in low-side commutation paths of brushed DC motors.

IC Role / Device Role / Timing Role: Medium-power level-shifting or current-sinking switch interfacing microcontroller GPIO to power stage.

Use Value: V_CE(sat) ≤ -1 V at -2 A minimizes drive-stage losses; h_FE stability ensures consistent turn-on timing across temperature.

Linear Voltage Regulators

Overcurrent Protection Circuits

Use Scenario: Implementing adjustable linear regulators delivering up to 5 A at ≤ 30 V dropout in test equipment power rails.

IC Role / Device Role / Timing Role: Series pass transistor dissipating regulated power; operated in active region with feedback-controlled base bias.

Use Value: 40 W P_tot and 150 °C T_j(max) enable sustained operation under full-load thermal stress with proper heatsinking.

Use Scenario: Latching shutdown circuit triggered by current-sense resistor voltage exceeding threshold in battery chargers or UPS inverters.

IC Role / Device Role / Timing Role: Fast-turn-off PNP switch activating crowbar or disable signal when fault condition is detected.

Use Value: -40 V V_CBO and -1 mA I_CEO ensure reliable off-state isolation during high-voltage transients and long-term standby.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127	TO-252 (DPAK), lower P_tot (25 W), V_CEO = -100 V, h_FE min = 30 @ -2 A	Better voltage margin but reduced thermal capacity; suited for surface-mount PCBs with limited heatsink area.	Select when board space constraints preclude TO-220 mounting and higher blocking voltage is required.
BD139	TO-126, P_tot = 12.5 W, V_CEO = -80 V, h_FE min = 25 @ -0.5 A	Lower power handling and smaller package; suitable only for <2 A continuous loads with forced air cooling.	Choose for cost-sensitive, low-power linear amplifier or driver stages where thermal budget is tightly controlled.

Compared with MJD127 and BD139, the 2N6111 offers superior thermal performance (40 W vs. 25 W/12.5 W) and proven reliability in through-hole industrial power stages, making it preferred where mechanical robustness and heatsink compatibility outweigh footprint or voltage-margin advantages.

Availability

2N6111 is available at Aetrix Electronics and suitable for industrial DC power supplies, motor drive half-bridge legs, linear voltage regulators, and overcurrent protection circuits requiring stable component supply and long-lifecycle availability.

Supply support for 2N6111 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The 2N6111 belongs to ST's legacy bipolar power transistor product line, engineered specifically for ruggedized medium-power switching and linear regulation in industrial equipment where thermal reliability and parameter consistency are critical.

FAQ

Is the 2N6111 RoHS compliant?

Yes, the 2N6111 manufactured by STMicroelectronics meets RoHS Directive 2011/65/EU requirements. Lead-free finish and halogen-free molding compound are standard per ST's current production release. Compliance documentation is available via ST's official product page under "Environmental Information".

Can the 2N6111 be used in avalanche mode?

No - the 2N6111 is not characterized or rated for repetitive avalanche operation. Its absolute maximum ratings define safe operating area (SOA) limits only under specified pulse conditions (300 µs, 1.5% duty cycle), and no energy-rated avalanche capability is specified in the datasheet.

What is the recommended heatsink interface for the 2N6111?

A thermally conductive insulating pad (e.g., mica or polymer-based) with thermal conductivity ≥1.5 W/m·K is recommended between the TO-220 metal tab and aluminum heatsink. Mounting torque must not exceed 0.5 N·m to avoid package deformation and bond wire damage.

Does the 2N6111 have built-in base-emitter resistor networks?

No - the 2N6111 is a discrete PNP bipolar junction transistor with no integrated resistors. External base drive circuitry (e.g., current-limiting resistor or dedicated driver IC) must be provided to establish proper bias conditions for switching or linear operation.

2N6111 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 7 A

Voltage - Collector Emitter Breakdown (Max):: 30 V

Vce Saturation (Max) @ Ib, Ic:: 3.5V @ 3A, 7A

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 30 @ 3A, 4V

Power - Max:: 40 W

Frequency - Transition:: 4MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

2N6111 FAQ

1.How can I place an order for 2N6111 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2N6111 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for 2N6111 reliable?

The price and inventory of 2N6111 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2N6111 is usually 5 days.

3.What payment methods are accepted for 2N6111?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2N6111 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2N6111?

2N6111 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2N6111 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for 2N6111?

For technical support, including 2N6111 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2N6111 requirements.

6.How does Aetrix verify that 2N6111 is sourced from the original manufacturer or authorized distributors?

All 2N6111 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 2N6111 meets industry standards.

7.What is the process for return or replacement of 2N6111?

All 2N6111 units undergo pre-shipment inspection (PSI). If there is an issue with 2N6111, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The 2N6111 part is unused and in its original packaging.

Return procedure for 2N6111:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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