STMicroelectronics TIP41C

Overview

TIP41C from STMicroelectronics is an NPN silicon power transistor in TO-220 package, designed for linear amplification and switching in audio and power circuits. It delivers 6 A continuous collector current, 100 V collector-emitter breakdown voltage, and 65 W power dissipation at TC = 25 °C, with DC current gain (hFE) grouped into R (15–28), O (24–44), or Y (42–75) for consistent biasing in amplifier stages.

For engineers reviewing the TIP41C datasheet, TIP41C pinout, TIP41C application, or TIP41C equivalent, key selection criteria include its 1.5 V VCE(sat) at IC = 6 A/IB = 0.6 A, 1.92 °C/W junction-to-case thermal resistance, and complementary pairing with TIP42C in push-pull output stages.

Technical Context

This base-island technology NPN transistor supports both linear-mode operation (e.g., Class AB audio output stages) and hard-switching applications (e.g., DC-DC converter switches). Its hFE linearity across IC = 0.3 A to 3 A and low saturation voltage enable stable quiescent current setting and reduced conduction loss.

The device features a 150 °C maximum junction temperature and robust 100 V VCBO rating, making it suitable for 48 V and lower industrial power rails. Thermal performance is defined by RthJC = 1.92 °C/W, requiring heatsink mounting via the electrically connected tab for sustained 6 A operation.

Key Specifications

Pinout & Package

TO-220 plastic package with electrically active metal tab (Collector), standard 3-pin vertical lead configuration. Mounting requires insulating washer if heatsink is grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJE13003 and 2N3055, TIP41C offers superior hFE consistency, lower saturation voltage at 6 A, and tighter thermal resistance-making it optimal for modern audio and regulated power designs where thermal predictability and linearity matter.

Availability

TIP41C is available at Aetrix Electronics and suitable for audio amplifier output stages, linear voltage regulators, and DC motor drivers requiring stable component supply and long-term manufacturability.

Supply support for TIP41C 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.

TIP41C belongs to ST's low-voltage complementary power transistor family, engineered specifically for cost-effective, thermally robust linear and switching power stages in audio, power supply, and motor control equipment.

FAQ

Is the TIP41C pinout compatible with other TO-220 NPN transistors?

Yes-the TIP41C uses standard TO-220 pinout: Pin 1 = Base, Pin 2 = Collector (tab), Pin 3 = Emitter. This matches industry-standard layout used by MJE13003, 2N3055, and BD139, enabling direct PCB footprint reuse in many designs.

What is the maximum safe operating area (SOA) limitation for TIP41C at 25 °C case temperature?

At TC = 25 °C, the SOA is bounded by 6 A continuous current, 100 V VCEO, and 65 W power limit. Derating is required above 25 °C: linear reduction to zero at 150 °C junction temperature, governed by RthJC = 1.92 °C/W and thermal interface quality.

Does TIP41C require a base resistor when driven by a microcontroller GPIO?

Yes-a series base resistor is mandatory. For 5 V GPIO driving 6 A load, IB ≈ 0.6 A is needed; assuming VBE(on) ≈ 2 V, a 5 Ω, 2 W resistor provides appropriate current limiting and prevents GPIO damage or transistor overdrive.

How does hFE grouping affect circuit performance in audio amplifier designs?

hFE grouping (R/O/Y) ensures predictable DC bias current in emitter-follower or common-emitter stages. Group Y (42–75) allows precise quiescent current setting in Class AB outputs, minimizing crossover distortion and thermal drift compared to ungrouped devices like 2N3055.