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

STMicroelectronics TIP2955

Name: TIP2955
Brand: STMicroelectronics
SKU: TIP2955
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TIP2955

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-247-3

Datasheet:: TIP2955.pdf

Description:: TRANS PNP 60V 15A TO-247-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TIP2955 from STMicroelectronics is a complementary PNP power bipolar junction transistor (BJT) designed for linear and switching power applications, featuring V_CEO = 60 V, I_C = 15 A, P_tot = 90 W at T_c ≤ 25°C, and low V_CE(sat) of 1 V at I_C = 4 A / I_B = 400 mA - commonly used in audio amplifier output stages and DC-DC converter switches.

For engineers reviewing the TIP2955 datasheet, TIP2955 pinout, TIP2955 application, or TIP2955 equivalent, key selection considerations include collector-emitter sustaining voltage (V_CE(sus) = 60 V), thermal derating above 25°C case temperature, base drive current requirements (I_B up to 7 A), and TO-247 mechanical compatibility with heatsink mounting.

Technical Context

The TIP2955 operates as a medium-power PNP BJT with epitaxial-base planar construction, optimized for high-current linear amplification and hard-switching duty cycles. Its complementary pairing with the NPN TIP3055 enables push-pull and H-bridge topologies without cross-conduction risk when properly biased.

It supports continuous collector current up to 15 A with safe operating area (SOA) defined by V_CE, I_C, and pulse duration constraints; thermal performance is governed by junction-to-case resistance (R_θJC) and external heatsink interface quality per TO-247 footprint.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - maximum collector-emitter voltage with base open; defines upper rail limit in linear amplifier or switch configurations
I_C	15 A - continuous DC collector current rating; determines minimum trace width and heatsink sizing for sustained operation
P_tot	90 W at T_c ≤ 25°C - total power dissipation limit; requires active cooling or derating above 25°C case temperature
V_CE(sat)	1 V @ I_C = 4 A, I_B = 400 mA - low saturation voltage reduces conduction loss in switching applications
h_FE	20–70 @ I_C = 4 A, V_CE = 4 V - moderate DC current gain; necessitates sufficient base drive for full saturation
T_J(max)	150 °C - maximum junction temperature; sets thermal shutdown threshold and reliability boundary under load

Pinout & Package

Package: TO-247 - three-terminal through-hole power package with isolated metal tab (collector), suitable for bolt-down heatsinking and high-current PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Current exit path for PNP device; connected to positive supply rail in common-emitter switch configuration
2 (Base)	Control input	Receives negative-going drive signal relative to emitter to turn on; requires current-limiting resistor in series
3 (Collector)	Collector terminal	Connected to load or ground return; electrically tied to metal tab - must be insulated from heatsink unless referenced to same potential

Key Features

Feature	Design Value
Low V_CE(sat)	1 V at 4 A enables <1 W conduction loss in Class AB audio output stage at typical bias points
Complementary pairing	Matched with TIP3055 (NPN) for symmetrical push-pull designs without gain or timing mismatch
TO-247 package	High thermal conductivity and mechanical robustness support >100,000-cycle thermal cycling in industrial power supplies
ECOPACK® compliance	Lead-free second-level interconnect meets RoHS and JEDEC JESD97 marking standards for environmental safety

Applications

Audio Power Amplifier

DC Motor Driver

Use Scenario: Output stage in 20–50 W discrete audio amplifier delivering low-distortion analog signals to 4–8 Ω speakers.

IC Role / Device Role / Timing Role: PNP power switch in complementary emitter-follower configuration, sourcing current to speaker load during negative half-cycle.

Use Value: Low V_CE(sat) minimizes crossover distortion and improves thermal stability under dynamic load conditions.

Use Scenario: H-bridge leg in brushed DC motor controller driving 12–24 V, 5–10 A loads in industrial actuators.

IC Role / Device Role / Timing Role: High-side PNP switch enabling bidirectional current control when paired with TIP3055 low-side NPN devices.

Use Value: 15 A I_C rating supports peak stall currents without secondary protection circuitry.

Linear Voltage Regulator

Switch-Mode Power Supply

Use Scenario: Pass transistor in adjustable 3–30 V, 3 A linear regulator powering sensitive analog subsystems.

IC Role / Device Role / Timing Role: Series pass element controlled by error amplifier feedback loop; dissipates excess input-output differential voltage.

Use Value: 90 W P_tot allows stable operation at 10 V dropout × 3 A = 30 W dissipation with adequate heatsinking.

Use Scenario: Main switch in 100–300 W flyback or forward converter operating at ≤100 kHz switching frequency.

IC Role / Device Role / Timing Role: Hard-switched PNP transistor turning on/off primary winding current under PWM gate drive.

Use Value: 60 V V_CEO supports 48 V input designs with 20% voltage margin for reflected spikes and ringing.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJ2955	V_CEO = 60 V, I_C = 15 A, but TO-3 package - higher R_θJC (3.5°C/W vs. TO-247's ~1.5°C/W)	Less suitable for surface-mount heatsink integration; requires larger mounting hardware	Select MJ2955 only if legacy TO-3 footprint compatibility is required and thermal budget permits higher junction rise
BD711	V_CEO = 100 V, I_C = 12 A, h_FE = 25–160 - higher voltage rating but lower current and tighter gain spread	Better for 80–100 V bus applications; less ideal for high-current 24 V motor drives	Choose BD711 where overvoltage robustness outweighs current capacity needs, e.g., automotive battery-supplied systems

Compared with MJ2955 and BD711, the TIP2955 offers superior thermal efficiency in TO-247 form factor and tighter h_FE consistency for predictable base drive design - making it preferred for cost-sensitive, high-reliability 24–48 V industrial power stages.

Availability

TIP2955 is available at Aetrix Electronics and suitable for audio amplifier output stages, DC motor drivers, linear voltage regulators, and switch-mode power supply primary switches requiring stable component supply across production lifecycles.

Supply support for TIP2955 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, Switzerland, designing and manufacturing microcontrollers, power transistors, sensors, and analog ICs for industrial, automotive, and consumer markets.

The TIP2955 belongs to ST's legacy power bipolar transistor product line, engineered specifically for robust, high-current linear and switching applications where thermal stability and SOA integrity are critical.

FAQ

Is the TIP2955 RoHS-compliant?

Yes, the TIP2955 is manufactured in an ECOPACK®-compliant TO-247 package with lead-free second-level interconnect, meeting RoHS Directive 2011/65/EU and JEDEC JESD97 marking requirements. The inner box label indicates the lead-free category and soldering profile limits.

What is the recommended base resistor value for switching operation at 10 A collector current?

At I_C = 10 A and h_FE ≥ 20 (min), required I_B ≥ 500 mA. With V_BE ≈ 1.8 V and 5 V logic drive, R_B = (5 V − 1.8 V) / 0.5 A = 6.4 Ω. Use 6.2 Ω ±5%, 2 W resistor to ensure saturation and avoid thermal runaway.

Can TIP2955 be used in parallel with another unit for higher current handling?

Parallel operation is not recommended without individual emitter resistors (≥0.1 Ω) due to h_FE and V_BE mismatches causing current imbalance. Even with balancing resistors, thermal coupling differences between devices may lead to unequal power sharing and premature failure.

Does the metal tab connect to any internal terminal?

Yes, the metal tab is internally connected to the collector terminal (Pin 3). When mounted to a heatsink, electrical isolation (e.g., mica washer + thermal grease) is mandatory unless the heatsink is held at collector potential - otherwise, short circuits or ground loops will occur.

TIP2955 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-247-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 15 A

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

Vce Saturation (Max) @ Ib, Ic:: 3V @ 3.3A, 10A

Current - Collector Cutoff (Max):: 700µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 20 @ 4A, 4V

Power - Max:: 90 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-247-3

TIP2955 FAQ

1.How can I place an order for TIP2955 through Aetrix?

Please submit a Request for Quotation (RFQ) for TIP2955 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 TIP2955 reliable?

The price and inventory of TIP2955 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TIP2955 is usually 5 days.

3.What payment methods are accepted for TIP2955?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TIP2955 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TIP2955?

TIP2955 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TIP2955 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 TIP2955?

For technical support, including TIP2955 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TIP2955 requirements.

6.How does Aetrix verify that TIP2955 is sourced from the original manufacturer or authorized distributors?

All TIP2955 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 TIP2955 meets industry standards.

7.What is the process for return or replacement of TIP2955?

All TIP2955 units undergo pre-shipment inspection (PSI). If there is an issue with TIP2955, 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 TIP2955 part is unused and in its original packaging.

Return procedure for TIP2955:

1.Submit a request within 90 days.

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

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