Features This series is obsolete and n Size: 8 mm diameter, 10 mm length not recommended for new designs. n Balanced and symmetrical TRIGARD design n High surge current rating Applications n Stable breakdown throughout life n Telecommunications electronics n Long life n Industrial electronics n Fail-Short available n Consumer electronics n RoHS compliant* 2028 Series Long Life Heavy-Duty 3-Electrode Gas Discharge Tube Characteristics Test Methods per ITU-T K.12, IEEE C62.31 and IEC 61643-311 GDT standards. Model No. Characteristic 2028-23 2028-25 2028-35 2028-42 DC Sparkover 20 % 100 V/s 230 V 250 V 350 V 420 V (1) Impulse Sparkover 100 V/s (Typical/99 %) < 450 V/550 V < 450 V/550 V < 700 V/800 V < 850 V/950 V 1000 V/s (Typical/99 %) < 650 V/750 V < 650 V/750 V < 850 V/950 V < 1050 V/1150 V (1) Impulse Sparkover voltage is defined as typical values of distribution. Impulse Transverse Delay ............................... 1000 V/s ..........................................................< 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 (2) DC Holdover Voltage ................................... 135 V ................................................................< 150 ms (3) Impulse Discharge Current .......................... 30,000 A, 8/20 s .............................................. 1 operation 20,000 A, 8/20 s .............................................. 10 operations 5,000 A, 10/350 s ............................................ 1 operation 200 A, 10/1000 s ............................................. 300 operations 20 A, 10/1000 s ............................................... 1500 operations Alternating Discharge Current ......................... 20 Arms, 1 second ............................................ 10 operations Operating Temperature ............................................................................................................... -55 to +85 C Climatic Category (IEC 60068-1)................................................................................................ 40 / 90 / 21 Moisture Sensitivity Level ........................................................................................................... 1 ESD Classification (HBM) ........................................................................................................... 6 An optional Switch-Grade Fail-Short device is available. The optional Fail-Short assembly will activate at a temperature of 215 C 217 C to provide a high conductive path to ground in case of a thermal overload. GDTs equipped with the optional Fail-Short device should be soldered either manually at a temperature that is below the activation temperature of the Fail-Short mechanism, or using a selective soldering process that does not exceed 210 C. Notes: (2) Network applied. (3) The Rated Impulse Discharge Current for TRIGARD GDTs is the total current equally divided between each line to ground. At delivery AQL 0.65 Level II, DIN ISO 2859. 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) *RoHS Directive 2002/95/EC Jan. 27, 2003 including annex and RoHS Recast 2011/65/EU June 8, 2011. Fail-Short Option Specifications are subject to change without notice. Blank = Standard Product Users should verify actual device performance in their F = With Fail-Short Mechanism specific applications. RoHS Compliancy The products described herein and this document are LF = RoHS Compliant Product subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/ docs/legal/disclaimer.pdf. OBSOLETE *RoHS COMPLIANT VERSIONS AVAILABLE *RoHS COMPLIANT LEAD FREE LEAD FREE VERSIONS ARE RoHS COMPLIANT* 2028 Series Long Life Heavy-Duty 3-Electrode Gas Discharge Tube Product Dimensions 2028-xx-A 2028-xx-C2 14.0 0.4 (.551 .016) 10.2 0.4 (.402 .016) 10.2 0.4 DIA. (.402 .016) 2.5 0.25 (.098 .010) 8.0 0.2 8.0 0.2 (.315 .008) (.315 .008) DIA. DIA. 1.5 0.3 (.059 .012) 15.0 0.5 (.591 .020) 1.0 0.04 4.5 0.4 (.040 .002) (.177 .016) 2028-xx-C DIA. 1.0 mm dia. lead wire 4.4 0.3 4.4 0.3 (.173 .012) (.173 .012) 10.2 0.4 30.5 0.5 (.402 .016) (1.201 .020) 2 PLCS. 2028-xx-C2F WITH FAIL-SHORT OPTION 1.0 0.04 (.040 .002) 8.5 0.3 DIA. (.335 .012) 7.5 0.4 8.0 0.2 (.295 .016) (.315 .008) DIA. 11.9 0.5 (.469 .020) 1.0 0.04 (.040 .002) DIA. MM DIMENSIONS: (INCHES) Packaging Specifications Standard Packaging Quantity Bulk (Bag) Tray Box Model 2028-XX-A 250 1000 2028-XX-C 50 300 2028-XX-C2 100 1000 2028-XX-C2F 100 1000 REV. G 06/18 Specifications are subject to change without notice. Users should verify actual device performance in their specific applications. The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf. OBSOLETE