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What is mouse bites on PCB board?


The mouse bite on the circuit board is part of the PCB production board. In order to facilitate separation, dense small holes are usually arranged in a line. When the circuit board is broken from the fixed edge, it will leave dense rat teeth marks. Let’s take a closer look at what exactly is a mouse bite?

What is mouse bite in PCB?

In case you’re wondering if this is a case of a mouse or a rodent literally biting on a board or something like that, no, it isn’t.
What-is-mouse-bite-in-PCBMouse bite refers to tiny perforations on printed circuit boards (PCBs). They are used to make it easier to mount multiple boards together. This allows manufacturers to produce many boards at once in a single panel.

In addition, mouse bites look similar to half-holes on postage stamps. So, these perforation holes allow small boards to connect together in groups. You can also call these perforated PCB breakaway tabs.

What is the breakaway tab and types?

The breakaway tab is a technique that involves creating tabs that connect together via vias. These tabs are usually placed on the edge of the board. When the board is assembled, the tabs are cut off, allowing the components to be soldered directly to the board.

The breakaway tabs are used to prevent users from accidentally breaking off the pins while soldering them. They also help keep the board stable when using hot air tools such as a reflow oven.

Also, the tab allows you to quickly remove the board from the case when needed. They provide a space between the PCB and the enclosure where the components do not touch the enclosure when the PCB is removed.

This feature is useful for troubleshooting, and also makes it easier to transport the board.What-is-the-breakaway-tab-and-types

Types of breakaway tab

The breakaway tab can be categorized into two namely:
●Mouse bite

Mouse bite
A mouse bite is created by punching out a hole in the copper layer of the PCB. The hole is then filled with solder paste which will later be melted during the assembly process.

These holes are typically located near the edges of the board. Mouse bites are often used to attach smaller daughterboards to larger motherboards.

They are also used to create a mechanical connection between two boards. For example, they may be used to hold an LCD screen onto a motherboard.

They are also used to connect the ground plane of one board to another.

V-groove is a method used to separate individual boards into different sizes. These are usually done manually and require a lot of skill. There are several methods of doing this. One such method is the use of V-grooves. A V-groove is basically a shallow groove that runs along the length of the board. It is normally used to separate boards of varying widths.

This method requires a very high degree of precision because there needs to be a gap of about 0.05 inches between the component and the groove. If this distance is too small, the board might bend under pressure. If it is too big, the board might crack.

What’s the purpose of PCB mouse bites?

Mouse bites are tiny holes found on printed circuit boards (PCBs). They are used to hold together multiple components, such as resistors, capacitors, and transistors. This allows for smaller circuits, which saves space.
What's-the-purpose-of-PCB-mouse-bitesIn addition, mouse bites look similar to half-holes on postage stamps.and also it is the one kind of PCB breakaway tabs. These holes help to improve a grip of a board during mounting because it helps to prevent a board from slipping out of place.

One of the benefits of these holes is that they allow manufacturers of electronic devices to process multiple panels at once for one price.

It’s also good to know that if you have a problem with your board, you can easily take it apart without damaging anything.

How to make mouse bites on PCB?

There are two main ways to create PCB mouse bites. One is to use a laser cutter and the other is to use a CNC router. Laser cutters are great for creating small numbers of PCB mouse bites. They are expensive though and require a fair amount of skill to operate.

CNC routers

CNC-routers-PCBCNC routers are much easier to use because they are designed specifically for cutting PCBs. They are relatively inexpensive and can easily handle larger quantities of PCB mouse bites.

However, CNC routers are not always suitable for every project. Some projects require precise cuts while others just require rough cuts. The best solution is to use both methods at once.

This way, you can use a laser cutter to do the more detailed cuts and then switch over to a CNC router when you need to get something done quickly.

The first step is to design your PCB mouse bites using a CAD program. You should start by designing each hole individually. Then, you will want to group them together so that you only have to draw one outline instead of many.

Once you’ve got all of your mouse bites drawn, you’ll want to export them to an STL file. This will give you a 3D model of your mouse bites.

Now, you’re ready to print your PCB mouse bites!

Laser cutter

Laser-cutterIf you’re going to use a laser cutter, you’ll want to set up your machine before printing. Make sure that you have enough room around your PCB mouse bites so that you don’t accidentally hit any surrounding parts.

If you’re going to use CNC routing software, you’ll want to prepare your board beforehand. First, you’ll want to remove all traces and the solder mask. Then, you’ll want to clean off the surface of the board. Finally, you’ll want to apply some flux to the board.

When you’re ready to begin, you’ll want to import your STL file into your CNC router software. Next, you’ll want to select the correct settings for your router. For example, you may want to choose a speed setting of 0.5mm/rev or 1mm/rev depending on what type of material you’re working with.

After you’ve selected the right settings, you’ll be able to move forward with your project. If you’re making a lot of PCB mouse bites, you might consider purchasing a CNC router. It will save you time and money.

What’s the difference between PCB mouse bites and V-grooves ?

PCB mouse bites are often used for small quantities of PCB panels where it is cheaper to drill holes and route traces around the edge rather than using v-grooves. V-grooves are typically used for large quantities of PCB panels where there are no restrictions on shape.
difference-between-PCB-mouse-bites-and-V-groovesThe choice between PCB mouse bites and v-grooves depends on how much material needs to be removed from the PCB panel. For example, if you want to cut out a square hole in the middle of a rectangular PCB panel, you could either use a PCB mouse bite to cut out the square hole, then route it around the outside of the hole, or you could use v-grooves to cut out the square section and then route around the inside of the groove.

If you want to make sure that the majority of the board is smooth and easy to work with, you might choose to use both methods together. This way, you can use PCB mouse bites to cut out the square area and then use v-grooves around the rest of the board to give it a smoother finish.

Things to consider when designing PCB mouse bites

When designing PCB mouse bites, there are certain things you need to take into consideration. Things like:


First, you will need to decide what size of hole you want to create. There are different sizes available depending on the type of component you are placing on the board. Most breakout tab holes are sized according to industry standards. For most applications, the standard hole diameter is 0.0508 mm.

Most manufacturers use this size because it allows easy insertion of wire into the hole. You may also need to adjust the location of the hole depending on its proximity to other components.

However, there are exceptions. For example, some older connectors used 0.010-inch (0.254 mm) holes. Other manufacturers use larger holes, including 0.040 inches (1.016 mm), 0.060 inches (1.524 mm), and 0.080 inches (2.032 mm). You will also need to decide how many holes you want to create. A common number is 4 but you can make as few or as many as you want.

Location and spacing

Next, you will need to determine how far apart each hole should be placed. This is usually determined by the spacing of your components.

Do you know how many breakout tabs are there on most boards? five holes. These holes are usually located near the center of the board. The holes are spaced apart by 0.76 millimeters or 0.030 inches. They’re typically about 0.020 inches wide.

However, some boards use different way and don’t follow these specifications. For example, the holes on Mouse Bite PCBs are different. Instead of having five holes, there are seven. In addition, the holes aren’t evenly spaced. Some are wider than others. If you have a lot of space between components, you will need more holes. However, if you have very close components, you will only need one hole.

As a result, the holes may vary in size. This makes it difficult to use the same drill bits for every hole. If you want to make sure you’ve got the correct hole sizes, you’ll need to measure each one individually.


Finally, you will need to figure out how dense you want the holes to be. Dense holes mean that there will be less room for routing traces. Less density means more room for routing traces.

The size of each hole varies depending on the board. You’ll find that the larger the hole, the easier it is to insert a component. Smaller holes make it difficult to insert components.

In addition to the number of holes, the diameter of each hole also differs. The smaller the hole, the harder it is to insert a part. Larger holes make inserting parts easy.

Which software can you use to design PCB mouse bites

Which software can you use to design PCB mouse bites?

There are several types of software available for PCB design , such as Eagle CAD, Altium Designer, and KiCAD. However, these programs only allow you to draw schematics and layouts, which means they cannot be used to create complete circuit boards. If you want to design complete circuit boards, then you need a full-featured program like Cadence Allegro.

How to add PCB mouse bites in Altium and Kicad?

The PCB Mouse Bite tool allows users to place components directly onto the board using the mouse. This feature is available in both Altium Designer and KiCAD EDA tools. To use the PCB mouse bite tool, click the component symbol, then select “PCB Mouse Bite” from the dropdown menu. A new window will open where you can drag the mouse around the board to create the desired location for the component.


If you’re looking for something that has both good gripping properties and high structural integrity, mouse bite PCBs are a great option. However, if you need something stronger than that, V-grooves are a better choice.

So, if you’re looking for help choosing the right panels that fit your needs, please contact us.



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