KH-A12501-02AWB Wire-to-Board Connector: Ultra-Low-Profile 1.25mm Pitch, 2-Pin Right-Angle SMT 

As consumer electronics, smart hardware, and compact industrial modules continue to evolve toward slimmer and smaller designs, PCB space is becoming increasingly valuable. Low-profile, high-density wire-to-board connectors compatible with automated SMT production have become essential components in modern hardware design. The Kinghelm KH-A12501-02AWB is a 1.25mm-pitch, 2-pin, right-angle surface-mount wire-to-board header. Featuring an ultra-low-profile structure, stable electrical performance, and tape-and-reel packaging suitable for automated production lines, it offers distinct advantages for signal connection applications in space-constrained environments, providing hardware engineers with a cost-effective interconnection solution.

Kinghelm KH-A12501-02AWB Product Image

1. Ultra-Low-Profile Right-Angle Design for Space-Constrained PCB Layouts

The KH-A12501-02AWB features a single-row, 1×2-pin configuration with a 1.25mm pitch and a right-angle surface-mount device (SMD) mounting design. Its on-board height along the Z-axis is only 1.95mm, while its base width along the Y-axis is 5.5mm, making it a typical ultra-low-profile connector. Compared with conventional vertical-mount connectors, its horizontal orientation minimizes the vertical space occupied within the enclosure, making it ideal for compact products where the battery sits close to the mainboard or housing thickness is strictly limited.

The product is supplied in tape-and-reel packaging, allowing direct compatibility with high-speed SMT pick-and-place machines. It supports automated feeding, placement, and reflow soldering, eliminating manual through-hole insertion and significantly improving production efficiency while reducing the risk of cold solder joints and incorrect assembly. This makes it well suited to the demands of modern, large-scale electronic manufacturing. With a gross weight of just 0.435g per unit, its lightweight design also helps reduce the overall weight of the module, making it particularly suitable for weight-sensitive devices such as wearables, drones, and compact sensors.

2. Excellent Electrical Performance for Reliable Long-Term Connections

In terms of electrical performance and environmental reliability, this connector offers a clear set of specifications. It is rated for a current of 1A and a voltage of 125V DC, making it suitable for the signal lines and low-power supply circuits found in most electronic devices. Its operating temperature range extends from -25°C to +85°C, enabling it to accommodate a variety of environments, including indoor electronics, compact industrial data acquisition modules, and auxiliary automotive accessories, while maintaining stable connections under temperature fluctuations.

The contact base material is phosphor bronze, which provides durable elasticity and consistent contact force. Even after repeated mating and unmating cycles, the contacts are designed to maintain stable contact pressure, helping reduce the risk of loose connections and intermittent signal interruptions. The contact areas are gold-plated to reduce contact resistance and improve oxidation and corrosion resistance. This helps prevent oxidation and tarnishing during long-term use, minimizing signal degradation and contact failures while preserving signal integrity.

3. Flame-Retardant PA9T Housing for Reliable Soldering and Safety

The insulating housing is made of PA9T specialty engineering plastic and meets the UL 94 V-0 flame-retardancy standard, providing an important layer of safety protection. PA9T offers excellent heat resistance and is designed to withstand the high temperatures associated with reflow soldering while minimizing the risk of deformation, resin overflow, and blistering. It is therefore suitable for high-temperature SMT soldering processes. The material also offers good electrical insulation, chemical resistance, and dimensional stability.

Even in humid environments or conditions involving light oil contamination, the housing can help maintain reliable insulation and reduce the risk of short circuits. Its stringent flame-retardancy rating means the material can self-extinguish under specified test conditions, helping improve the overall safety margin of the finished product. These characteristics make it suitable for consumer electronics, security equipment, and smart home products that must meet specific safety requirements.

Kinghelm KH-A12501-02AWB Datasheet

4. Versatile Applications Across Slim and Compact Smart Hardware

The KH-A12501-02AWB has a clearly defined application focus. Its 2-pin configuration is commonly used for single-channel signal connections or low-power supply connections. Typical applications include smart wristbands, Bluetooth earphone charging cases, compact camera modules, smart home sensors, lithium battery protection boards, industrial data acquisition probes, and drone lighting boards.

In many slim and compact smart devices, internal space is extremely limited, particularly in the vertical direction. Conventional high-profile connectors may be difficult to accommodate, whereas this ultra-low-profile, 1.95mm-high right-angle header can help overcome PCB layout constraints. Standardized PCB footprint drawings also make it easier for engineers to incorporate the component directly into their PCB designs. The pin arrangement and solder pad dimensions are optimized to support secure solder joints and reliable mechanical connections, making the connector suitable for equipment exposed to a certain degree of vibration.

5. Standardized Domestic Components for a More Controllable Supply Chain

As a standardized product from Kinghelm, a Chinese connector brand, the KH-A12501-02AWB combines the advantages of domestic sourcing with consistent product quality. Kinghelm has long specialized in RF antennas and connector interconnection products, with established manufacturing capabilities spanning mold development, injection molding, terminal stamping, and surface plating. Strict specification control, comprehensive datasheets, and PCB footprint drawings provide valuable technical support for hardware development.

The same product series also offers versions with 3, 4, and 5 pins, among other configurations. By adopting a consistent 1.25mm pitch across the series, engineers can flexibly select connectors with different pin counts within the same product platform, helping reduce material management costs and simplify design iterations.

Overall, the KH-A12501-02AWB is an economical and reliable interconnection component designed for compact electronic devices. Its combination of a high-density 1.25mm pitch, ultra-low-profile right-angle design, gold-plated phosphor bronze contacts, flame-retardant PA9T housing, and tape-and-reel packaging for SMT assembly directly addresses the challenges of wire-to-board connections in space-constrained hardware.

As the consumer electronics industry continues to pursue thinner and more compact products and the adoption of domestically manufactured components accelerates, standardized, reliable, and mass-production-friendly connectors such as this one will continue to support innovation in smart hardware, compact industrial modules, security systems, and sensor applications. They represent a practical and dependable choice for hardware engineers seeking reliable interconnection solutions in their bills of materials (BOMs).

About Kinghelm

Kinghelm(www.kinghelm.net) places strong emphasis on new product development, quality control, and customer service.

Its wireless signal transmission and reception product portfolio includes BeiDou/GPS navigation and positioning antennas, ceramic Bluetooth antennas, Wi-Fi antennas, communication antennas, flexible embedded FPC antennas, and filters.

Its signal transmission, connection, and interconnection products include RF adapter cables, coaxial connectors, electrical signal connectors, and interfaces such as Type-C, IPEX, SMA, RJ45, HDMI, MCX, and USB, along with supporting pin headers, female headers, terminals, sockets, and connectors. The company also offers DIP switches and tactile switches.

In addition, Kinghelm provides customized non-standard and specialized products, as well as integrated solutions, tailored to the requirements of customers in the automotive, industrial, medical, equipment manufacturing, data storage and computing, and smart terminal sectors.

KH-A12501-02AWBView Product Details