Board-to-board connectors (BTB for short) are essential devices for power and signal coupling connections in precision circuits. With the continuous improvement of product complexity and circuit design scale, board-to-board connectors are also developing in several directions along the market demand towards high speed, high power density, and thinness. The following are the selection points of BTB connectors.

Structural dimensions of the connector

First of all, we should pay attention to the external dimensions of the connector, pay attention to whether the installation space of the connector will interfere with other parts, and select the appropriate connector and fixing method according to the space size. For the connector itself, pay attention to the pin Pin and pitch Pitch. The number of pins selected for the connector depends on the number of connected signals. For some patch connectors, the number of pins should not be too much. Because the connector plastic will be deformed by heat due to high temperature during the welding process of the mounter, the pin is falsely welded due to the bulge in the middle.

Electrical performance of the connector

The electrical properties of the connector mainly include: limiting current, contact resistance, insulation resistance and electrical strength. When connecting high-power power supply, pay attention to the limit current of the connector, do derating design, and pay attention to the withstand voltage value between the pins.

Pay attention to the contact resistance when transmitting high-frequency signals (such as LVDS signals). Connectors typically have a low and constant contact resistance, typically ranging from tens of mΩ to hundreds of mΩ. For signals with impedance requirements, attention should be paid to impedance matching to avoid signal reflection.

Mechanical properties of the connector

The mechanical properties of the connector include the extraction force, the frequency of the extraction and the mechanical protection. Some signal interfaces need to be plugged and unplugged frequently. When selecting the connector, pay more attention to the plugging force and number of plugging and unplugging of the connector.

Mechanical anti-stay is very important to the connector, once the reverse is likely to cause irreversible damage to the circuit.

Environmental performance of the connector

For example, when the application environment is humid, the requirements for moisture resistance and salt spray resistance of the connector are high, so as to ensure that the metal contacts of the connector are not corroded. In the field of industrial control, the requirements for the anti-vibration and impact performance of the connector are high, so as to avoid the connector falling off during vibration.