JST (Japan Solderless Terminal) connectors are widely recognized for their reliability and compact design, making them suitable for a variety of applications across different industries. Among JST’s broad range of connectors, the 4-pin configurations stand out for their ability to provide stable electrical connections for both power and signal transmission. This article introduces four commonly used 4-pin JST connectors: JST XH, JST SH, JST PH, and JST SM. Each of these connector types serves different purposes, depending on factors like size, current rating, and application environment.
The JST SH series features a much smaller 1.0mm pitch, making the 4-pin variant ideal for space-constrained applications. Its compact design suits modern miniaturized electronics, including:
- Drones and RC models: Connecting small components like motors, sensors, and cameras, where weight and space are critical considerations.
- Wearable devices: Smartwatches and fitness trackers, where internal space is extremely limited.
- FPV (First-Person View) systems: Used in connecting cameras and transmission modules in drone systems.
Due to its small size and precise alignment, the JST SH connector is often favored in high-density, small-scale applications where space is a priority.
General Specifaction:
| Current Rating: | 1A |
| Voltage Rating: | 50V |
| Temperature Range: | -20°C~+85°C |
| Contact Resistance: | 20m Omega Max |
| Insulation Resistance: | 500M Omega Min |
| Withstanding Voltage: | 500V AC/minute |
The JST PH series, with a 2.0mm pitch, is another popular choice for compact and mid-power applications. The 4-pin PH connector can be found in:
- Consumer electronics: Connecting batteries in portable devices like mobile phones, handheld gaming consoles, and wireless peripherals.
- Computer peripherals: Used in fans, keyboards, and mice for low-current power and data transmission.
- Industrial control equipment: Connecting small sensors and control modules that require a stable and reliable connection.
The PH connector’s balance between size and current-carrying capability (up to 2A) makes it a common choice for various low-power electronics where space is moderately constrained.
General Specifaction:
| Current Rating: | 2A |
| Voltage Rating: | 250V |
| Temperature Range: | -25°C~+85°C |
| Contact Resistance: | 20m Omega Max |
| Insulation Resistance: | 1000M Omega Min |
| Withstanding Voltage: | 800V AC/minute |
The JST XH series has a 2.5mm pitch, and the 4-pin version is widely used in applications requiring a balance of compact size and sufficient current-carrying capacity. Common uses include:
- Household appliances: Air conditioners, refrigerators, and washing machines, where stable board-to-wire connections are essential.
- LED lighting: Connecting power and control signals for LED strips and lighting controllers.
- Consumer electronics: Battery packs, remote controls, and similar devices.
The JST XH 4-pin connector can handle up to 3A of current and is easy to use due to its simple latch mechanism, making it a reliable choice for low- to mid-power applications.
General Specifaction:
| Current Rating: | 3A |
| Voltage Rating: | 250V |
| Temperature Range: | -25°C~+85°C |
| Contact Resistance: | 20m Omega Max |
| Insulation Resistance: | 1000M Omega Min |
| Withstanding Voltage: | 1000V AC/minute |
The JST SM series has a 2.5mm pitch and is known for its sturdy design, featuring a locking mechanism that ensures secure connections. It is widely used in environments where vibrations or other harsh conditions might cause standard connectors to become loose. Common applications include:
- LED lighting systems: Especially for outdoor or rugged installations where secure connections are crucial.
- RC models and drones: Used to connect batteries, motors, and control systems that require reliable connections in motion-intensive environments.
- Automotive and industrial equipment: The SM connector is ideal for connecting power and signal lines in vehicles and heavy-duty machines due to its ability to withstand higher currents and its robust locking mechanism.
The JST SM 4-pin connector can handle higher current ratings (typically up to 3A) and is favored for outdoor, automotive, or high-vibration applications where a solid lock is necessary to maintain connectivity.
General Specifaction:
| Current Rating: | 3A |
| Voltage Rating: | 250V |
| Temperature Range: | -25°C~+85°C |
| Contact Resistance: | 20m Omega Max |
| Insulation Resistance: | 1000M Omega Min |
| Withstanding Voltage: | 1000V AC/minute |
Conclusion
Each type of JST 4-pin connector has its specific advantages depending on the application’s requirements. The JST XH series offers a solid choice for household and consumer electronics, the JST SH series excels in compact spaces like drones and wearables, the JST PH series balances size and power for small devices, and the JST SM series is built for durability and secure connections in harsh environments.
When selecting a 4-pin connector, it is essential to consider factors such as pitch size, current capacity, and the specific needs of the device or system being designed. JST’s broad range of 4-pin connectors ensures that there is a suitable solution for virtually any application.