With applications such as handheld instruments and consumer electronics, smaller is a key attribute for most components including switches. However, even larger products benefit from small pushbutton switches to increase the functionality in a smaller space or provide more functions in an established case size. Just because the switch is small, other parameters cannot be compromised. For example, high dielectric strength and operation over a wide industrial temperature range can be standard requirements. In some cases, an additional capability, such as anti-static design, provides an advantage that some applications need. In most cases, the operating life cannot be decreased and 50,000 operations or more are commonly specified for these switches.
Anti-static Subminiature Switch
Constructed for automated processing and high-density mounting, NKK Switches BB series subminiature pushbutton switches address logic-level applications such as communication systems, telecom, handheld instruments and control panels. The anti-static switches incorporate a sliding twin crossbar contact mechanism for increased switching reliability and smoother positive detent action. Attaching the unit's 6 mm carbon-impregnated bushing to a support bracket prevents anti-static discharge to the contacts. Including the bushing, the body of the switch is only 0.516 inch (13.1 mm) in height. To prevent contact contamination, the units have a totally sealed body. Available in single and double pole as well as momentary and maintained actions, the maintained action versions have a latch down feature that provides visible, audible and tactile feedback. Rated 0.4 VA maximum at 28V ac/dc maximum, the mechanical and electrical life ratings are 50,000 operations minimum for momentary circuits and 25,000 operations minimum for maintained circuits.
http://rbi.ims.ca/5406-565
Small Tactile Switch
With a contact rating of 50 mA at 30V dc, E-Switch's TL1140 tact switch boasts an operating life of 1,000,000 cycles. The two-lead thru-hole switch has an actuation force of 70 ±20 gmf and travel of 0.35 ±0.2 mm. In addition to operating over a -25 to 85C range, other key specifications include a contact resistance of 100 mV at 5V dc, a minimum insulation resistance of 100 mV and a dielectric strength of 600V ac. Target applications for the 6.2 × 6.2 mm footprint switch include telecommunications, consumer electronics, audio/visual, medical, testing/instrumentation, computer servers and peripherals, especially handheld electronic products.
http://rbi.ims.ca/5406-566
Subminiature Pushbutton Switch
Available in both latching and non-latching versions, CIT RELAY & SWITCH RPH Series pushbutton switches meet DPDT, 4PDT and 6PDT applications. With an electrical rating of 100 mA at 30V dc, units operate from -20 to 70C (storage temperature is -40 to 85C) with a typical electrical life of 30,000 cycles. Initial contact resistance is less than 50 mV max at 2 to 4V dc. Other design parameters include dielectric strength of 1,250V rms minimum and insulation resistance greater than 100 MV minimum. Available in both latching and non-latching configurations, options include pc terminals or Snap-In pc terminals and single stage mounting chassis, pc mounting bracket or no chassis. The 7.4 × 9.1 mm switches target audio products, computers and peripherals, instrumentation and measurement equipment and non-power on/off applications.
http://rbi.ims.ca/5406-567
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