STMicroelectronics TIP3055

Overview

TIP3055 from STMicroelectronics is a complementary NPN 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, h_FE ≥ 20 at I_C = 4 A, and V_CE(sat) = 1 V at I_C = 4 A / I_B = 400 mA - used in audio amplifier output stages and DC-DC converter switches.

For engineers reviewing the TIP3055 datasheet, TIP3055 pinout, TIP3055 application, or TIP3055 equivalent, key selection considerations include collector-emitter sustaining voltage (V_CE(sus) = 60 V), thermal dissipation capability in TO-247 package, base drive current requirement (I_B = 3.3 A for I_C = 10 A), and safe operating area (SOA) compliance for pulsed load handling.

Technical Context

The TIP3055 operates as a high-current NPN switch or linear amplifier with epitaxial-base planar construction, supporting both continuous conduction and pulse-mode operation up to 150°C junction temperature. Its low V_CE(sat) and high h_FE enable efficient base-driven switching in Class AB audio outputs and unregulated power supply regulators.

Designed for complementary pairing with TIP2955 (PNP), it supports push-pull configurations without external bias network complexity. The device's V_CER = 70 V (with R_BE = 100 Ω) and V_CEO(sus) = 60 V define its ruggedness under inductive load switching conditions.

Key Specifications

Pinout & Package

Package: TO-247 - Three-terminal through-hole power package with isolated metal tab (collector-connected), optimized for high-power thermal transfer and mechanical robustness in industrial power modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN power BJT applications.

Compared with MJE13009 and 2N3055, the TIP3055 offers optimal balance of voltage rating, current capacity, and thermal performance in a RoHS-compliant TO-247 package - making it preferred for new industrial audio and power supply designs where manufacturability and thermal reliability are critical.

Availability

TIP3055 is available at Aetrix Electronics and suitable for audio amplifier output stages, unregulated linear power supplies, non-synchronous DC-DC converters, and low-frequency motor drive circuits requiring stable component supply across production lifecycles.

Supply support for TIP3055 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, specializing in power management, analog, microcontrollers, and automotive ICs - with over 40 years of discrete transistor innovation.

The TIP3055 belongs to ST's legacy high-power BJT family, engineered specifically for cost-sensitive industrial and audio power applications demanding ruggedness, thermal stability, and complementary pairing capability.

FAQ

Is the TIP3055 RoHS-compliant and lead-free?

Yes. The TIP3055 is manufactured in ST's ECOPACK®-compliant TO-247 package with lead-free second-level interconnect, meeting JEDEC JESD97 marking requirements and EU RoHS Directive 2011/65/EU. The inner box label specifies the lead-free category and soldering profile limits.

What is the recommended heatsink thermal resistance for continuous 10 A operation?

At I_C = 10 A and V_CE(sat) ≈ 3 V, power dissipation is ~30 W. With R_θJC ≈ 1.39 °C/W and max T_J = 150°C, ambient ≤ 50°C requires R_θSA ≤ 2.5 °C/W. A finned aluminum heatsink ≥ 150 cm² surface area with thermal interface material is recommended.

Can the TIP3055 replace the 2N3055 in existing designs?

Yes, with mechanical and electrical verification. Both share V_CEO = 60 V and I_C = 15 A ratings, but TIP3055 uses TO-247 (vs. TO-3), has lower R_θJC, and improved h_FE consistency. PCB footprint and mounting hardware must be adapted; thermal simulation is advised for linear operation.

Does the TIP3055 require base current limiting in switching applications?

Yes. Base drive must be current-limited to prevent damage during saturation. For I_C = 10 A, minimum I_B = 3.3 A is required; typical designs use 4–5 A with series base resistor or active current source. Exceeding I_B(max) = 7 A risks bond wire failure or gain degradation.