KH-4.5X4.5X10H-B3J Tactile Switch: The Perfect Fusion of Compact Design and Reliable Performance

In today’s rapidly evolving world of increasingly compact and intelligent electronic devices, tactile switches serve as one of the core components for human-machine interaction. The selection of a tactile switch directly affects both the user experience and the long-term reliability of a product.

The Kinghelm KH-4.5X4.5X10H-B3J tactile switch stands out as an ideal choice for many space-constrained applications thanks to its precision dimensions, stable electrical performance, and robust mechanical construction. This article provides a comprehensive analysis of the product from the perspectives of technical specifications, design features, application scenarios, and usage recommendations.

Kinghelm KH-4.5X4.5X10H-B3J Product Image

1. Product Overview

The KH-4.5X4.5X10H-B3J is a through-hole tactile switch featuring an ultra-compact 4.5 mm × 4.5 mm footprint and a 10 mm switch height. It is a typical compact, high-profile tactile switch designed to provide a clear operating feel while maintaining a small PCB footprint.

The product is supplied in bags, with a gross weight of only 0.1731 g per unit. While maintaining adequate structural strength, the switch achieves a lightweight design, making it particularly suitable for weight-sensitive applications such as handheld devices and wearable electronics.

Its round black button and right-angle PC terminals with a supporting bracket provide both comfortable operation and enhanced mechanical stability after PCB installation.

2. Detailed Technical Specifications

The key electrical and mechanical specifications of the KH-4.5X4.5X10H-B3J tactile switch are as follows:

• Circuit configuration: Single Pole Single Throw (SPST), providing simple ON/OFF control. The switch is momentary rather than latching: it conducts when pressed and opens when released.

• Contact rating: 50 mA DC

• Rated voltage: 12 V DC

• Contact resistance: ≤100 mΩ (initial value), ensuring low signal transmission loss.

• Insulation resistance: ≥100 MΩ at 500 V DC, providing reliable electrical isolation.

• Dielectric withstand voltage: 100 V AC, 50 Hz for 1 minute, with no breakdown or flashover.

• Operating force: 160 ± 30 gf or 260 ± 50 gf, with two options available to meet different tactile requirements.

• Travel: 0.15 ± 0.05 mm, providing short and crisp actuation feedback.

• Mechanical life: ≥50,000 cycles, ensuring reliable performance during long-term use.

• Button shape: Round, providing a suitable contact area for fingertip operation.

• Button color: Black, featuring a matte surface that helps resist fingerprints and wear.

• Terminal type: PC terminals, suitable for wave soldering or manual soldering.

• Supporting bracket: Yes, providing additional mechanical support.

• Mounting style: Right-angle (90-degree) terminals, suitable for side-actuated applications or layouts along the edge of a PCB.

• Operating temperature: -25°C to +85°C, suitable for a wide range of operating environments.

These specifications indicate that the switch can provide reliable performance in a variety of conventional consumer electronics and industrial applications.

3. Design Highlights and Structural Advantages

1. SPST Circuit Configuration for Simple and Reliable Operation

The switch adopts a conventional metal spring contact structure, in which an internal stainless-steel spring is deformed under pressure to establish electrical contact.

This simple construction helps reduce potential failure points while providing excellent spring-back characteristics. As a result, the switch can maintain stable contact resistance and actuation travel even after tens of thousands of operating cycles.

2. Round Button for an Enhanced Operating Experience

The black round button not only provides a clean and simple appearance but also offers an ergonomic operating experience.

Its curved surface helps guide the user’s finger naturally during operation, reducing the possibility of accidental activation while providing clear tactile feedback. A slight “click” sensation during pressing allows the operator to clearly determine whether the switch has been successfully actuated.

3. Supporting Bracket and Right-Angle Terminals for Enhanced Stability

The KH-4.5X4.5X10H-B3J is equipped with an integrated metal supporting bracket. After soldering, the bracket and PCB form a secure mechanical connection, helping resist pin fatigue or breakage caused by repeated pressing or vibration.

The right-angle mounting configuration is particularly suitable for side-actuated applications, such as buttons located on the side of electronic devices or thin products where vertical space is limited. It can also facilitate automated through-hole assembly processes.

4. Compact Dimensions for High-Density PCB Layouts

With a footprint of only 4.5 mm × 4.5 mm, the switch offers a highly compact form factor compared with many conventional tactile switches.

It can be easily placed on densely populated PCBs, leaving valuable space for other functional modules. The 10 mm height provides sufficient accessibility for operation without excessively increasing the overall product thickness, achieving a balance between tactile usability and compact product design.

5. Multiple Operating-Force Options for Different Applications

Two operating-force options are available: 160 gf and 260 gf.

The lighter 160 gf option is suitable for applications requiring relatively gentle actuation, such as remote controls and earbuds, while the 260 gf option is more appropriate for industrial equipment or automotive control buttons where resistance to accidental activation is desirable.

Designers can therefore select the appropriate operating force according to the requirements of the target application.

4. Application Fields and Typical Use Cases

Thanks to the characteristics described above, the KH-4.5X4.5X10H-B3J can be widely used in the following fields:

Home Appliances

The switch can be used as a mode-selection or confirmation button in products such as rice cookers, microwave ovens, and air-conditioner control panels. Its long mechanical life and clear tactile feedback can enhance the everyday user experience.

Consumer Electronics

It can be applied to pairing buttons on Bluetooth earbud charging cases, side buttons on smartwatches, and function buttons on VR controllers, meeting the requirements for compact size and low weight.

Digital Products

Typical applications include power buttons and menu-navigation controls for digital cameras, portable speakers, and other compact digital devices.

Automotive Electronics

Potential applications include multifunction buttons on steering wheels and auxiliary control buttons on center consoles, such as defogging or trunk-release controls.

Its operating temperature range and mechanical construction make it suitable for a variety of automotive-related applications; however, automotive-grade qualification should be verified separately for applications requiring formal automotive certification.

Industrial Controls

The switch can be used for parameter-setting buttons on instruments and meters, as well as start/stop controls on test equipment. Its reliable actuation and tactile feedback help ensure accurate operation even in demanding working environments.

Communication Equipment

Potential applications include WPS buttons on wireless routers and push-to-talk (PTT) controls on two-way radios, where stable signal triggering is required during frequent operation.

Typical Application Circuit

In a typical button-input circuit, one terminal of the switch is connected to GND, while the other is connected to an MCU GPIO pin with a pull-up resistor. The MCU detects the change in logic level when the button is pressed or released and thereby identifies the button state.

Kinghelm KH-4.5X4.5X10H-B3J Datasheet

5. Usage Precautions and Recommendations

To ensure stable long-term operation, the following points should be considered during design, assembly, and use:

Electrical Limits

Do not exceed the specified 12 V / 50 mA rating. Operating beyond the rated limits may cause contact erosion, welding, or other forms of contact failure.

Soldering Conditions

For wave soldering, a recommended temperature of 260°C ± 5°C is specified, with a soldering time of no more than 5 seconds.

For manual soldering, a fine-tip soldering iron is recommended. The temperature should be controlled at 350°C or below, and the soldering time for each terminal should not exceed 3 seconds. Excessive heat may damage the internal spring-contact mechanism.

Storage Conditions

The switch should preferably be stored in a dry environment at -10°C to +40°C, with a relative humidity of ≤80%, to help prevent oxidation.

After opening the package, the switches should be used as soon as practical to minimize the risk of moisture affecting terminal solderability.

Mechanical Protection

Avoid applying excessive lateral force to the side of the button during installation, as this may deform the internal spring mechanism.

After final assembly, make sure that the external keycap is properly aligned with the switch button. Off-center or eccentric actuation may place excessive stress on the switch and shorten its service life.

Cleaning and Environmental Protection

After PCB soldering, flux residue may be cleaned as necessary. However, care should be taken to prevent cleaning agents from penetrating into the switch body, as this may result in contact failure or unstable electrical performance.

For equipment operating in dusty environments, additional dust-protection measures around the switch may be considered.

Conclusion

The Kinghelm KH-4.5X4.5X10H-B3J tactile switch combines an extremely compact 4.5 mm × 4.5 mm footprint, a practical 10 mm height, a robust right-angle through-hole design with a supporting bracket, and reliable 50 mA / 12 V electrical performance, providing an effective button solution that balances compactness and reliability.

Its multiple operating-force options, clear tactile feedback, and mechanical life of at least 50,000 cycles make it suitable for a wide range of applications, including home appliances, consumer electronics, automotive-related electronics, communication equipment, and industrial controls.

For designers who need to implement reliable human-machine interaction within a limited amount of PCB or mechanical space, the Kinghelm KH-4.5X4.5X10H-B3J is certainly a component worth considering.

About Kinghelm

Shenzhen Kinghelm Electronics Co., Ltd.（www.kinghelm.net）has technical backbones from Tsinghua University and UESTC, and has introduced overseas returnee professionals. Kinghelm is able to develop highly reliable and high-performance antenna and connector products.KH series products of "Kinghelm" brand include Beidou/GPS antennas, RF adapter connectors, plug connector, electrical data connectors, terminals, and customized vehicle harnesses, industrial / medical connectors, and special antenna connectors."Kinghelm connects world", Kinghelm has grown with the development of China's Beidou industry. Starting from supplying Beidou/GPS dual mode antennas, IPEX terminals, and RF adapter cables for automotive manufacturers, Kinghelm has continuously developed products. Currently, it has a series of WiFi, Bluetooth, NB-loT, LoRa, Zigbee, UWB, and GSM antennas, RFID tags, RF adapter cables, standard microwave antennas, vehicle grade SMA, SMB, FAKRA holders, coaxial cables, and can customize non-standard antenna connectors based on customer drawings or samples.

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