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

STMicroelectronics TIP115

Name: TIP115
Brand: STMicroelectronics
SKU: TIP115
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TIP115

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: TIP115.pdf

Description:: TRANS PNP DARL 60V 2A TO-220

Quantity:: RFQ Add To RFQ list

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Inventory:2,998

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Product details

Overview

TIP115 from STMicroelectronics is a complementary PNP silicon power Darlington transistor in monolithic configuration with integrated antiparallel collector-emitter diode, rated for VCEO = –100 V, IC = –2 A, and Ptot = 2 W at Tamb ≤ 25 °C, used in medium-power industrial switching and linear amplifier stages.

For engineers reviewing the TIP115 datasheet, TIP115 pinout, TIP115 application, or TIP115 equivalent, key selection criteria include guaranteed hFE ≥ 500 at IC = –2 A, VCE(sat) ≤ –2.5 V, integrated freewheel diode forward voltage (–1.2 V typ.), and TO-220 package thermal resistance Rthj-amb = 62.5 °C/W.

Technical Context

The TIP115 implements a monolithic Darlington pair with on-chip base resistors (R1 ≈ –7 kΩ, R2 ≈ –230 Ω) and an integrated antiparallel diode across C–E terminals. It operates as a high-gain, medium-voltage PNP switch with built-in protection against inductive kickback.

Its negative polarity operation requires reversed biasing versus NPN counterparts (e.g., TIP112), and its safe operating area is limited by second breakdown constraints above 100 V and 1 A, with derating starting at Tcase > 25 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
VCEO	–100 V: Maximum reverse-biased collector-emitter voltage before breakdown under open-base condition.
IC	–2 A DC: Continuous collector current rating defining maximum steady-state load drive capability.
hFE	≥500 at IC = –2 A, VCE = –4 V: Ensures reliable saturation with low base drive current in switching applications.
VCE(sat)	≤ –2.5 V at IC = –2 A, IB = –8 mA: Limits conduction loss and self-heating during on-state operation.
Rthj-amb	62.5 °C/W: Thermal resistance from junction to ambient, requiring heatsinking for sustained >0.5 W dissipation.
Integrated Diode VF	–1.2 V typ. at IF = –2 A: Enables intrinsic flyback path for inductive loads without external diode.

Pinout & Package

Package: TO-220 (Jedec standard, 3-lead, vertical mounting, case connected to collector).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Main emitter terminal	Current exit point; connects to positive rail in high-side switch configurations.
2 (Base)	Control input	Drives Darlington pair via internal R1/R2 network; requires –8 mA for full saturation at –2 A load.
3 (Collector)	Main collector terminal / case	Electrically tied to metal tab; must be isolated from chassis unless used as common collector node.

Key Features

Feature	Design Value
Monolithic Darlington structure	Integrates driver and output transistors + base bias resistors on single die, eliminating external component count.
Integrated antiparallel C–E diode	Provides inherent flyback path for relay/inductor loads, reducing BOM and PCB footprint.
High DC current gain	hFE ≥ 500 at –2 A enables direct microcontroller GPIO drive without external buffer stage.
TO-220 mechanical standardization	Enables drop-in replacement in legacy industrial designs and compatibility with widely available heatsinks.

Applications

Relay Driver Stage

DC Motor H-Bridge High-Side Switch

Use Scenario: Driving 24 V, 1.5 A electromagnetic relays in PLC I/O modules.

IC Role / Device Role / Timing Role: PNP high-side switch controlling relay coil energization/de-energization.

Use Value: Integrated diode clamps inductive turn-off spikes, eliminating need for external snubber diode and reducing layout complexity.

Use Scenario: Upper-leg switching in 12–48 V brushed DC motor control for HVAC actuators.

IC Role / Device Role / Timing Role: Sustained-current PNP switch enabling bidirectional motor control when paired with NPN low-side devices.

Use Value: –100 V VCEO rating supports operation across wide supply range while maintaining margin against back-EMF transients.

Linear Voltage Regulator Pass Element

Industrial Lamp Dimmer Output Stage

Use Scenario: Series pass transistor in adjustable 0–30 V, 1.5 A bench power supply.

IC Role / Device Role / Timing Role: Linear-mode current amplifier regulating output voltage via feedback-controlled base bias.

Use Value: High hFE minimizes base drive error current, improving regulation accuracy and thermal stability at full load.

Use Scenario: Phase-angle controlled dimming of 100 W incandescent lamps in building automation panels.

IC Role / Device Role / Timing Role: AC line-synchronized switching element conducting during positive half-cycles in triac-assisted topology.

Use Value: –2.5 V VCE(sat) limits conduction loss and junction temperature rise during extended on-periods at 50/60 Hz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD117	Surface-mount DPAK package; lower Rthj-amb (40 °C/W); same VCEO/IC/hFE specs.	Requires re-layout for SMT assembly; better thermal performance in compact enclosures.	Select for space-constrained industrial controllers where automated assembly is preferred.
TIP127	Higher VCEO (–100 V same), but higher VCE(sat) (–4 V max); no integrated diode.	Lacks built-in flyback path; external diode required for inductive loads.	Choose only if cost sensitivity outweighs design simplicity and board area savings.

Compared with MJD117 and TIP127, the TIP115 offers through-hole TO-220 compatibility, integrated flyback diode, and balanced trade-offs between thermal management, layout flexibility, and protection integration - making it optimal for field-serviceable industrial hardware.

Availability

TIP115 is available at Aetrix Electronics and suitable for relay drivers, DC motor controls, linear regulators, and lamp dimmers requiring stable component supply across multi-year production cycles.

Supply support for TIP115 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 TIP115 belongs to ST's legacy power bipolar transistor family, engineered specifically for robust, cost-effective medium-power linear and switching tasks in harsh industrial environments.

FAQ

Is the TIP115 pin-compatible with the TIP110?

No - the TIP115 is the complementary PNP device to the NPN TIP110, sharing identical TO-220 pinout (E-B-C), but with opposite polarity and mirrored electrical ratings (e.g., –100 V VCEO vs. +100 V). Direct substitution requires circuit-level polarity reversal and bias adjustment.

Does the integrated diode support continuous freewheeling current?

Yes - the monolithically integrated antiparallel collector-emitter diode is rated for IF = –2 A continuous, matching the transistor's IC rating, and exhibits VF ≈ –1.2 V at that current, enabling reliable energy recirculation in inductive switching applications without external components.

What is the minimum base current needed to saturate the TIP115 at 2 A load?

At IC = –2 A and VCE ≤ –2.5 V, the datasheet specifies IB = –8 mA typical for saturation. Designers should apply ≥ –10 mA to ensure margin across temperature and unit-to-unit variation, leveraging the internal R1/R2 bias network which eliminates external resistor calculation.

Can the TIP115 be used in parallel for higher current handling?

No - Darlington transistors like the TIP115 exhibit positive thermal feedback and poor current-sharing characteristics due to nonlinear hFE vs. temperature behavior. Parallel operation is not recommended; instead, use a single higher-rated device such as the TIP145 or discrete high-current PNP solutions with forced current balancing.

TIP115 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: PNP - Darlington

Current - Collector (Ic) (Max):: 2 A

Voltage - Collector Emitter Breakdown (Max):: 60 V

Vce Saturation (Max) @ Ib, Ic:: 2.5V @ 8mA, 2A

Current - Collector Cutoff (Max):: 2mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1000 @ 1A, 4V

Power - Max:: 2 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

TIP115 FAQ

1.How can I place an order for TIP115 through Aetrix?

Please submit a Request for Quotation (RFQ) for TIP115 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 TIP115 reliable?

The price and inventory of TIP115 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TIP115 is usually 5 days.

3.What payment methods are accepted for TIP115?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TIP115 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TIP115?

TIP115 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TIP115 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 TIP115?

For technical support, including TIP115 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TIP115 requirements.

6.How does Aetrix verify that TIP115 is sourced from the original manufacturer or authorized distributors?

All TIP115 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 TIP115 meets industry standards.

7.What is the process for return or replacement of TIP115?

All TIP115 units undergo pre-shipment inspection (PSI). If there is an issue with TIP115, 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 TIP115 part is unused and in its original packaging.

Return procedure for TIP115:

1.Submit a request within 90 days.

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

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