features size: 8 mm diameter, 10 mm length balanced and symmetrical trigard ? design high surge current rating stable breakdown throughout life long life fail-short available rohs compliant* applications telecommunications electronics industrial electronics consumer electronics characteristics 2028 series long life heavy-duty 3-electrode gas discharge tube *rohs directive 2002/95/ec jan. 27, 2003 including annex and rohs recast 2011/65/eu june 8, 2011. speci? cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device perfor mance may vary over time. users should verify actual device performance in their speci? c applications. test methods per itu-t (ccitt) k.12 class 3 and iec 61643-311. characteristic model no. 2028-23 2028-25 2028-35 2028-42 dc sparkover ?0 % @ 100 v/s 230 v 250 v 350 v 420 v impulse sparkover 100 v/? (typical/99 %) 1000 v/? (typical/99 %) < 450 v/550 v < 650 v/750 v < 450 v/550 v < 650 v/750 v < 700 v/800 v < 850 v/950 v < 850 v/950 v < 1050 v/1150 v impulse transverse delay ............................... 1000 v/? ..........................................................< 75 ns insulation resistance (ir) ............................... 100 v ............................................................... .> 1 g capacitance..................................................... 1 mhz ......................................................... ......< 2 pf glow voltage ................................................... 10 ma ......................................................... .......~ 70 v arc voltage ...................................................... 1 a ......................................................... ............~ 10 v dc holdover voltage 1 .................................... 135 v ................................................................< 150 ms impulse discharge current 2 ........................... 30,000 a, 8/20 ? .............................................. 1 operation 20,000 a, 8/20 ? .............................................. 10 operations 5,000 a, 10/350 ? ............................................ 1 operation 200 a, 10/1000 ? ............................................. 300 operations 20 a, 10/1000 ? ............................................... 1500 operations alternating discharge current ......................... 20 arms, 1 second ............................................ 10 operat ions operating temperature ............................................................................................................... -55 to +85 ? climatic category (iec 60068-1)................................................................................................ 40 / 90 / 21 notes: 1 network applied. 2 the rated impulse discharge current for trigard gas discharge tubes is the total current equally divided between each line to ground. ? at delivery aql 0.65 level ii, din iso 2859. *rohs compliant bulk packaging speci cations 2028-xx-alf ................... 250 pcs. per tray 2028-xx-clf ..................... 50 pcs. per tray 2028-xx-c2lf ................. 100 pcs. per tray 2028-XX-C2FLF............... 100 pcs. per tray how to order 2028 - nn - x n f lf model number designator voltage (divided by 10) 23 = 230 v 35 = 350 v 25 = 250 v 42 = 420 v leads a = no leads / cassette applications c = 1.0 mm lead shape (see product dimension drawings) fail-short option blank = standard product f = with fail-short mechanism rohs compliancy lf = rohs compliant product asia-paci c: tel: +886-2 2562-4117 fax: +886-2 2562-4116 europe: tel: +41-41 768 5555 fax: +41-41 768 5510 the americas: tel: +1-951 781-5500 fax: +1-951 781-5700 www.bourns.com
speci cations are subject to change without notice. the device characteristics and parameters in this data sheet can and do vary in different applications and actual device perfor mance may vary over time. users should verify actual device performance in their speci c applications. 2028 series long life heavy-duty 3-electrode gas discharge tube product dimensions 10.0 0.3 (.394 .012) 50.0 0.3 (1.969 .012) 1.0 (.039) dia. 1.0 (.039) dia. 7.4 0.1 (.291 .004) 8.0 +0.2/-0.1 (.315 +.008/-.004) dia. 22.0 +0.5/-1.5 (.866 +.020/-.059) 2028-xx-a 16.5 +1/-0.7 (.650 +.039/-.028) 2028-xx-c2f with fail-short option 2028-xx-c 1.0 mm dia. lead wire 4.4 0.3 (.173 .001) 4.4 0.3 (.173 .001) 10.0 0.3 (.394 .012) 13.4 (.528) 8.0 +0.2/-0.1 (.315 +.008/-.004) dia. 4.5 1.5 (.177 .059) 15.0 0.5 (.591 .020) 1.0 (.039) dia. 4.4 0.3 (.173 .001) 4.4 0.3 (.173 .001) 2028-xx-c2 10.0 0.3 (.394 .012) 13.4 (.528) 8.0 +0.2/-0.1 (.315 +.008/-.004) dia. 4.5 1.5 (.177 .059) 1.0 (.039) dia. 4.4 0.3 (.173 .001) 4.4 0.3 (.173 .001) 10.0 0.2 (.394 .008) 0.60 (.023) 1.5 0.2 (0.059 .008) 7.4 0.1 (.291 .004) 8.0 0.1 (.315 .004) dimensions: mm (inches) rev. a 05/13
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