Terminal de tornillo KH-A2508-03AB: Un conector compacto y fiable con paso de 2.5 mm.

A medida que los dispositivos electrónicos siguen tendiendo hacia la miniaturización y una mayor integración, los conectores que unen las placas de circuito impreso con el cableado externo deben proporcionar conexiones estables y seguras en un espacio limitado. Los terminales de tornillo se utilizan ampliamente en el control industrial, los electrodomésticos inteligentes, los módulos de potencia y campos similares porque ofrecen un cableado sencillo, un bloqueo fiable y no requieren herramientas de crimpado especializadas. Kinghelm El terminal de tornillo vertical SMT KH-A2508-03AB es precisamente un producto de este tipo, que combina un diseño compacto con un rendimiento robusto.

Posicionamiento del producto y estructura básica

The KH-A2508-03AB belongs to the wire-to-board header family of screw terminals. It features a 1x3P pin configuration (single row, three positions), with a total of 3 pins. The pitch between adjacent pins is 2.5 mm, which is considered a compact spacing. Compared to traditional 5.0 mm or 3.81 mm terminals, the 2.5 mm pitch allows more connection points on the same PCB area, helping to meet high-density routing requirements.

The mounting style is “vertical SMT” (vertical surface mount). After soldering, the terminal body stands perpendicular to the circuit board, with its pins directly attached to the PCB pads for reflow or hand soldering. This vertical SMT approach avoids consuming space on the back side of the board (unlike through-hole components) and is compatible with automated pick-and-place assembly, improving manufacturing efficiency. In terms of dimensions, the height above the board (Z-axis) is 9.5 mm, and the width at the board edge (Y-axis) is 8 mm. These two key dimensions provide precise clearance and enclosure design guidance for mechanical engineers, ensuring no interference between the terminal and the product housing.

Electrical Performance: Meeting Standard Low-Voltage Requirements

Las características eléctricas son el criterio principal para juzgar la usabilidad de un terminal. Kinghelm KH-A2508-03AB is rated at 3A AC/DC and 250V AC/DC. These ratings cover the vast majority of low-voltage control signal transmission and low-power power connection scenarios, such as sensor signal acquisition, PLC I/O expansion modules, LED driver power inputs, and auxiliary windings of small switching power supplies. When selecting this terminal, users simply need to ensure that the maximum continuous current in the circuit does not exceed 3A and the highest working voltage stays within 250V.

Contact resistance and insulation resistance reflect the terminal’s own conduction quality and isolation capability. The KH-A2508-03AB specifies a maximum contact resistance of 20 mΩ – a very low value. Low contact resistance means negligible voltage drop and heat generation at the contact interface between the terminal, the wire, and the PCB pad, thus reducing energy loss and extending product life. For insulation resistance, the product guarantees a minimum of 1000 MΩ (i.e., 1 GΩ). This ensures extremely high isolation between adjacent pins and between pins and the surrounding ground plane, effectively preventing leakage current cross-talk – especially valuable for analog or low-voltage signal transmission.

Dielectric strength is an important measure of the safety margin of the insulation system. This terminal withstands 1000V AC applied for one minute without breakdown or flashover. Although the rated working voltage is only 250V, the 1000V withstanding test proves that the insulation material and structural design provide ample safety headroom to handle short-term overvoltage or surge events.

Selección de materiales: Equilibrio entre conductividad, resistencia al calor y retardo de llama.

Los materiales del conector determinan directamente la soldabilidad, la resistencia ambiental y la vida útil. Para el KH-A2508-03AB, Kinghelm uses brass as the base material for the contacts, followed by a tin plating on the surface. Brass offers good electrical conductivity and adequate mechanical strength, maintaining elastic contact even after repeated insertions or screw locking. The tin plating significantly improves solderability – whether for reflow or hand soldering, it forms a good solder joint quickly – and also provides oxidation and corrosion resistance for long-term use in typical indoor environments.

The insulating housing is made of PA6T plastic. PA6T is a high-performance polyamide known for its high heat deflection temperature (typically >260°C) and low moisture absorption. This allows the KH-A2508-03AB to withstand lead-free reflow soldering peak temperatures (typically 245–260°C) without softening, deformation, or dimensional instability. Compared to ordinary nylons (e.g., PA66), PA6T offers superior dimensional stability at high temperatures.

For flame retardancy, the terminal housing achieves UL94 V-0 rating. This is a demanding level for plastic materials. The vertical burn test requires that after two 10-second ignitions, the flame self-extinguishes within 10 seconds and no flaming drips ignite the underlying cotton. A V-0 rating means that even in the event of electrical overload or an external fire source, the housing material self-extinguishes quickly, greatly reducing the risk of fire spread.

Temperatura de funcionamiento y límites de uso

According to the specifications, the KH-A2508-03AB has a rated operating temperature range of -25°C to +85°C. This range covers the vast majority of commercial and industrial indoor applications, such as ordinary factory floors,  household appliances, and office equipment. It is worth noting that when the terminal operates for extended periods near the upper temperature limit while carrying the full 3A current, the internal temperature rise may add to the ambient temperature. Therefore, designers should consider derating appropriately based on actual heat dissipation conditions or leave ventilation gaps in high-density layouts.

Escenarios de aplicación típicos

En función de los parámetros anteriores, se pueden identificar varias direcciones de aplicación típicas:

• Equipos de automatización industrial: Such as I/O expansion modules for small PLCs, solid-state relay modules, and stepper motor driver control interfaces. The screw-type structure firmly locks multi-strand flexible wires connected in the field and resists moderate vibration.

• Paneles de control para hogares inteligentes y electrodomésticos: Examples include main control boards for air conditioners, display panels for washing machines, and control boxes for smart toilets. The 2.5 mm pitch helps reduce board size, while the vertical SMT form factor suits single-side layouts.

• Fuentes de alimentación para iluminación LED: Connections between the input power line and output LED board in constant-current drivers or dimming modules. The 3A/250V rating is sufficient for most residential and commercial lighting applications.

• Instrumentación: Terminales de señal para módulos de adquisición de datos, transmisores de sensores y medidores de potencia: aplicaciones que requieren un cableado práctico y un contacto fiable.

• Sistemas de gestión de baterías: Balance lines or sense lines on some low-voltage BMS protection boards.
  
  

  Kinghelm Especificación KH-A2508-03AB

  
  

Precauciones de uso

Para aprovechar al máximo el rendimiento del KH-A2508-03AB, conviene tener en cuenta varios aspectos prácticos:

1. Selección de cables: For 3A current, copper-core wires of AWG 24–28 (cross-section approximately 0.2–0.8 mm²) are recommended. The strip length should generally be 5–7 mm, taking care not to nick the copper strands.

2. Par de apriete del tornilloNo aplique un par excesivo, ya que podría aplastar el cable o dañar las roscas. Se recomienda un par de apriete de entre 0.2 y 0.4 N·m; en la práctica, apriete hasta que quede firme y añada una vuelta más.

3. proceso de soldaduraPara soldadura manual, mantenga la temperatura de la punta del soldador ≤350 °C y el tiempo de calentamiento por unión ≤3 segundos. Para soldadura por reflujo, siga la clasificación de resistencia al calor del material PA6T; la temperatura máxima no debe exceder los 260 °C.

4. Protección ambiental: Although the product’s operating temperature goes down to -25°C, pay attention to thermal expansion matching between the housing and solder joints in long-term low-temperature or large-temperature-swing environments. Avoid direct use in strongly corrosive atmospheres or locations with condensation.
   
   

Conclusión

El Kinghelm El terminal de tornillo KH-A2508-03AB ofrece una estructura compacta de 1x3P con paso de 2.5 mm, a la vez que proporciona una transmisión eléctrica fiable a 3A/250V. Los contactos de latón con baño de estaño garantizan una baja resistencia de contacto y una buena soldabilidad, mientras que la carcasa de PA6T con resistencia a la llama UL94 V-0 proporciona una alta resistencia al calor y seguridad contra incendios. El estilo de montaje vertical SMT y la altura de 9.5 mm sobre la placa le confieren una clara ventaja para diseños de PCB con espacio limitado. Ya sea en entornos industriales, electrónica para el hogar inteligente o módulos de alimentación, este terminal proporciona conexiones estables y fiables de cable a placa en espacios reducidos. Si busca un terminal de tornillo que ahorre espacio en la placa sin comprometer la fiabilidad, el Kinghelm El modelo KH-A2508-03AB merece ser tenido en cuenta.

Sobre Nosotros Kinghelm

Shenzhen Kinghelm Electronics Co., Ltd. (www.kinghelm.net）cuenta con una sólida base técnica proveniente de la Universidad de Tsinghua y la UESTC, y ha incorporado profesionales que han regresado del extranjero. Kinghelm es capaz de desarrollar productos de antenas y conectores de alto rendimiento y gran fiabilidad. Los productos de la serie KH de "Kinghelm"La marca incluye antenas Beidou/GPS, conectores adaptadores de RF, conectores de enchufe, conectores de datos eléctricos, terminales y arneses personalizados para vehículos, conectores industriales/médicos y conectores especiales para antenas."Kinghelm conecta el mundo", Kinghelm ha crecido con el desarrollo de la industria Beidou de China. Comenzando con el suministro de antenas de modo dual Beidou/GPS, terminales IPEX y cables adaptadores de RF para fabricantes de automóviles, Kinghelm Ha desarrollado continuamente productos. Actualmente, cuenta con una serie de antenas WiFi, Bluetooth, NB-IoT, LoRa, Zigbee, UWB y GSM, etiquetas RFID, cables adaptadores de RF, antenas de microondas estándar, soportes SMA, SMB y FAKRA para vehículos, cables coaxiales y puede personalizar conectores de antena no estándar según los planos o muestras del cliente.

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