B3U Ultra-small Tactile Switch

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Omron’s B3U series of ultra-small tactile SMD switches measures just 1.2mm (H) x 3mm (W) x 2.5mm (D), takes only 75% of the volumetric space of similar models, and is ideal for high-density packaging applications. The B3U SPST-No contact configuration has a switching capacity of 1 to 50mA at 5 to 12VDC with an initial contact resistance of 100mΩ max and features dust-proof construction delivering reliable performance in harsh environments. These versatile switches are available in top or side actuated configurations. A ground terminal version provides protection against static discharge, and thety can be delivered with or without a locating boss.

The B3U operates in a temperature range of -25 to +70°C in 60% humidity without icing or developing condensation. They are fully RoHS compliant, and the top actuated model (B3U-1000 series) has a minimum life expectancy of 200,000 operations while the side-actuated model (B3U-3000) has a minimum life expectancy of 100,000 operations. The operating force for the B3U-1000 is 153 ±50gf and the B3U-3000 is 162 ±50gf; the release force for both is 20.3gf minimum.


  • Dust-proof construction
  • Static discharge protection
  • Initial contact resistance: 100mΩ
  • Switching capacity: 1-50mA at 5-12VDC
  • Dimensions: 1.2mm (H) x 3mm (W) x 2.5mm (D)
  • RoHS Compliant


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  • Computer Peripherals