ed domes and edm domes dimensions are shown in mm (inch) dimensions subject to change www.ittcannon.com a-36 ed ed, the disc contact is a momentary tact switch with short travel and good tactile feedback. direct mounting on a printed circuit board is possible. in that case, the dome must be actuated by a soft actuator of 3.0 mm (0.118) minimum diameter. the ed dome is available in various types of modules and is the main component of several switches presented in this catalog. self-cleaning system: the contact is made on at least 3 points of the lower diaphragm, these 3 points of contacts are always different at each new switch action. during the switching movement, the upper disc slides on the lower diaphragm, ensuring the contact s self-cleaning. edm the edm is available in 4 versions: edm 450 au edm 650 au edm 450 ag edm 650 ag the edm multi dome series was developed for low pro?e applications needing increased tactile response and high performance speci?ations. applications range from aircraft instru- ment panels to radio keypads. this high performance dome switch combines our reliable ed contact system with added tactile domes for forces of 4.5n (450 grams) and 6.5n (650 grams). main features gold (au) or silver (ag) contacts two different operating forces low pro?e compact pwb spacing proven application in avionics construction ed edm function momentary momentary contact arrangement 1 make contact = spst 1 m ake contact=spst,no distance between button 12.7 (0.500 ) 12.7 (0.500 ) centers, min. terminals pc pins or tabs pc pins or tabs electrical data silver gold switching power max. ac/dc 6 w 3 w 3 w switching voltage max. ac/dc 100 v 100 v 100 v dc switching current max. ac/dc 100 ma 50 ma 50 ma carrying current max. ac/dc 250 ma 250 ma dielectric strength (50 hz/1 min.) 300 v 300 v 300 v operating life with max. switching 10 6 operations 5 10 6 operations power contact resistance 10 m ? 15 m ? 15 m ? insulation resistance (100 v) 10 11 ? 10 11 ? 10 11 ? contact bounce 100 ? 100 ? 1ms mechanical data ed edm switching travel 0.3 (0.012 ) 0.4 (0.0157 ) max. admissible 0.5 max. admissible 0.5 (0.02) (0.0197) operating force 2.4n 25% 4.5n (450 grams) ?5% (240 grams 25%) 6.5n (650 grams) ?5% further data contact material silver plated, gold plated ag (silver plated) au (gold plated) operating temperature 25? to + 70? -55? to +85? storage temperature 40? to + 85? -55? to + 85? material housing thermoplastic contact base phosphor bronze plating of contact area 1.5 microns gold (g) climatic data climatic category (days) 10 for silver version 56 for gold version soldering by static bath 255? for 5 seconds ordering code: see next page.
dimensions are shown in mm (inch) dimensions subject to change www.ittcannon.com a-37 ed domes and edm domes dimensional drawings switch action principal the disc contact is essentially made of two separate conductive domes diaphragms separated by an insulated material. the upper diaphragm is shaped so that under pressure it collapses suddenly and establishes contact with the lower diaphragm. upper diaphragm lower diaphragm switch in resting position pressure insulating washer circular contact area switch in active position ordering code 1234 example: ed s sc 0 1 designation: ed / edm450 / edm650 2 contact material: s = silver, g = gold 3 contacts: ac = with pc pins, sc = with tabs 4 sealing: 0 = ?x sealed, 1 = totally sealed 12.7 (0.5) 10.35 (0.407) 0.8 (0.0315) 11.36 (0.447) 5.7 (0.224) 11.3 (0.445) 12 (0.472) 1.2 (0.0472) ed domes
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