Product overview 10PCS D5040 2SD5040 TO3PF power transistors supplied as a set of 10 units. Designed for replacement and in circuits that specify the 2SD5040 transistor in a TO3PF package. Key benefits Direct, dropin replacements for devices specifying 2SD5040, simplifying repairs and maintenance. Consistent electrical behavior across the set, helping restore or maintain circuit performance. TO3PF package offers a compact footprint and straightforward mounting for heat sinking and thermal management. Packaged as a 10piece lot to support multiple repairs, prototyping, or small production runs. What this product does Functions as a power transistor suitable for amplification and switching tasks in electronic circuits. Intended for use wherever the 2SD5040 model is required, ensuring compatibility with existing board designs and schematics. Important attributes Quantity: 10 pieces per package. Model numbers: D5040 and 2SD5040. Package type: TO3PF, compatible with standard TO3PF mounting and heat sink arrangements. Typical applications: power amplification, switching, and power management stages where a 2SD5040 is specified. Practical use scenarios Audio amplifier : worn or damaged output transistors in vintage or custom audio amplifiers that specify 2SD5040 devices. Power supply restoration: Use as switching or series pass elements during of regulated power supplies and industrial regulators. Motor control and drive circuits: Install in small motor drivers or control boards where robust switching transistors are required. What you receive Ten pieces of D5040 2SD5040 transistors in TO3PF package, ready for installation. Notes for installers Confirm circuit specifications and pinout compatibility before installation. Observe standard handling precautions for electronic components to avoid damage from static discharge. Provide appropriate heat sinking as required by your circuit design and operating conditions.