Through Hole LED, also known as plug-in LED, is a type of LED that is fixed by inserting leads into holes on a printed circuit board (PCB) and soldering them. Compared to surface mount technology (SMT) LEDs, straight in LEDs typically have longer leads and larger packaging, making them more suitable for manual soldering or in applications that require additional mechanical strength.

characteristic:

Easy to manually solder: The leads of the straight LED can be easily inserted into the holes of the PCB and fixed by manual soldering, which is very useful in small batch production and maintenance work.

High mechanical strength: Due to the lead wire passing through the PCB and being soldered on the other side, the straight LED provides better mechanical support and is suitable for applications that may be subjected to physical impact.

Good heat dissipation performance: In line LEDs typically have larger packaging and more metal contact area, which helps with better heat dissipation, especially in high-power applications.

Multi color options: Direct insertion LEDs also offer multiple color options, including red, green, blue, yellow, white, etc.

Cost effectiveness: For some applications, especially those that require manual welding, straight in LED may be more cost-effective.

Structure:

Direct insertion LEDs are typically composed of a transparent or colored plastic package containing LED chips, electrodes, and sometimes phosphors used to produce specific colors. There are two metal leads at the bottom of the package for electrical connections.

Common packaging types:

T-1, also known as 5mm LED, is one of the most common straight in LED packaging, with a diameter of approximately 5mm, and the height and lead length vary depending on the specific model.

T-1 3/4: Slightly larger than T-1, with a diameter of approximately 7mm, suitable for applications that require higher brightness.

Other customized sizes: In addition to standard sizes, there are many other sizes and shapes of straight in LEDs to meet different application requirements.

Application:

Direct insertion LEDs are widely used in various fields, including but not limited to:

Indicator lights for electronic devices

Display and indication of household appliances and industrial equipment

Traffic lights and road signs

Car lighting and internal indicator lights

Toys and holiday decoration lighting

Education and laboratory equipment

matters needing attention:

When designing and welding straight in LED, the following points need to be noted:

Lead forming: Before welding, it is necessary to shape the LED leads appropriately according to the PCB layout to ensure correct spacing and alignment.

Welding process: The welding of straight LED requires appropriate temperature and time control to avoid damaging the LED or causing cold welding.

Thermal management: In high-power applications, heat dissipation issues must be considered and may require the use of cooling solutions such as heat sinks or fans.

When selecting straight in LED, reference should be made to the manufacturer's data manual and application notes for detailed size information, recommended design guidelines, and welding process parameters. Direct insertion LEDs are still very popular in small-scale production and applications that require additional mechanical support due to their ease of manual welding and good mechanical strength.