In recent years, board-to-board connectors are trending toward smaller sizes. The most common board-to-board connector pitch for handheld consumer electronics is 0.40 mm; while 1.00 mm stack heights are small connectors, recent major OEMs are using connectors as low as 0.70 mm, and sometimes even lower. Older miniature connectors with a width of more than 4.00 mm a few years ago were replaced by connectors in the 3.40 mm width range, and current "narrow body" board-to-board concepts are typically in the 2.40 to 2.60 mm range.
However, board-to-board connectors are not necessarily as small as possible. When purchasing board-to-board connectors, in addition to basic issues such as circuit size, stacking height and width, there are several things to consider:
If a smaller vacuum port pick-up area is acceptable, it can be argued that the smaller the connector, the better. But before selecting a subminiature connector, it must be checked whether the connector has all the other properties required, and it needs to be carefully tested to ensure that it is sufficiently robust.
A receptacle with a top-mounted header will need to be chosen, as this setup will enable tracking under the receptacle and will likely facilitate the use of conformal coatings.
Some disadvantages of top-mounted receptacles are that the width of the vacuum pickup area tends to be narrow, there is no plastic housing material above the receptacle terminals to prevent lift-up during rough disconnection, and the more uneven receptacle top surface may create a barrier for the operator's connection work. come to trouble.
But it may be necessary to live with the extra connector length in order to achieve the desired locking function of these connectors; greater breaking force usually also means greater engagement force, which may cause problems for larger size circuits.
Board-to-board connector test inspection
1) Observe that the loading voltage on the board-to-board connector should not exceed 50% of its rated voltage.
2) The installation size of the board-to-board connector For the plug-in header, the length of the soldering pin on the soldered PCB requires that the exposed part of the PCB board be greater than 0.5MM.
3) For board-to-board connectors with higher precision, try to choose a model with a positioning pin if the PCB space permits, so as to facilitate the operation when manual soldering is required.
4) Check for fool-proof design
5) Check whether the material used in the board-to-board connector contains lead.
6) Small-sized board-to-board connectors have low contact pressure, and when used with low current and voltage, it is recommended to use gold-plated or silver-plated connectors to avoid affecting the signal due to film resistance.
7) Pay attention to observe whether the mated height of the board-to-board connector meets the soldering height of the components around the PCB. The matching height must be greater than the soldering height of the components around the PCB, and there must be a certain margin to ensure that there is no interference. In particular, it is necessary to pay attention to the possible height error of the components after the PCB is soldered.
Board-to-board connection problems and common troubleshooting
Correctly connecting board-to-board connector products can improve the service life of the product and ensure the good operation of mechanical equipment. If board-to-board products fail, if they are not dealt with in time, it will bring immeasurable economic losses. The following briefly introduces the connection and troubleshooting methods of the board-to-board connector circuit.
1) Regarding the connection problem of the board-to-board connector
The board-to-board plug socket is used to electrically connect two separated circuit boards, which includes a first connector connected to the circuit board and a transfer connector used to connect the first connector in series, wherein the first connector It has a first terminal connected with the circuit board and a body accommodating the first terminal. The transfer connector is provided with a second terminal and a body for accommodating the second terminal. The two extended tail ends of the second terminal can be respectively plugged and matched with the first terminal to achieve the connection with the two circuit boards respectively. The electrical connection of the first connector, wherein the end of one of the first terminal and the second terminal has a reversely bent elastic portion, and the body and the second terminal can be adjusted according to the spacing setting standard of the circuit board. Choose a moderate extension length.
2) Troubleshooting for board-to-board connectors
Once the product fails, it can be judged that the reason is that the wire is broken during use, the product is loose, etc. The frequency of wires breaking in the middle is not much, most of them are broken at the connector, so the focus of inspection should be on the sensor and the wires connected along the way to see if they have problems such as looseness and poor contact. Generally, open circuit faults caused by poor contact are mostly due to corrosion at the product end, and external dirt entering the terminal or connecting socket, resulting in a decrease in contact pressure. To deal with this kind of failure, you need to remove the connector, then plug it in again, change its connection status, and restore it to normal contact.
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