Gas Discharge Tubes GTCX25-XXXM-R02 Series Littelfuse Circuit Protection 5mm 2Pole GDTs (ceramic gas discharge tubes), are commonly used to help protect sensitive telecom equipment such as communication lines, signal lines and data transmission lines from damage caused by transient surge voltages that typically result from lightning strikes and equipment switching operations. Littelfuse Circuit Protection GDTs offer a high level of surge protection, low capacitance and a broad array of breakover voltage levels, making them suitable for applications such as MDF (Main Distribution Frame) modules, high data-rate telecom applications (e.g. ADSL, VDSL), and surge protection on power lines. Littelfuse Circuit Protection GDTs, can help equipment meet the most stringent regulatory standards. Benefits: Features:  Compact, small form factor suitable for efficient  2Pole, 5mm devices assembly  Broad voltage range from 75V-600V  Helps provide overvoltage fault protection against high energy surges  Various form factors: surface mount, axial leads, no leads  Suitable for high-frequency applications  Low capacitance and insertion loss  UL 497B recognized  RoHS compliant  Devices tested per ITU K.12 recommendations  Non-radioactive materials Applications:  Telecommunications • Industrial and consumer electronics, such as - MDF modules, xDSL equipment, RF system - Surge protectors protection, antenna, base station - Alarm system   Telecommunications • Industrial and consumer electronics, such as © 2016 Littelfuse,Inc. Document: SCD27304 Specifications aMreD suFb jmecto tdo uchleansg,e x wDitShoLu te nqotuiciep. m e n t , R F s y t e m Status: Released Revised July 26,2016 1 Rev: B Date: JULY 26, 2016  Protection, antenna, pase station 

Gas Discharge Tubes GTCX25-XXXM-R02 Series Device Voltage Ratings and Part Marking Impulse DC Holdover Part Number DC Sparkover On-State Voltage Sparkover Voltage @100V/s Nominal Per ITU K.12 ±20% Tolerance @100 V/µs (V) @1000 V/µs (V) (<150ms) (@ 1A) (V) (V) (V) GTCX25-750M-R02 75 450 550 <52 20 GTCX25-900M-R02 90 450 550 <52 20 GTCX25-141M-R02 140 500 600 <80 20 GTCX25-151M-R02 150 500 600 <80 20 GTCX25-201M-R02 200 600 700 <135 20 GTCX25-231M-R02 230 600 700 <135 20 GTCX25-251M-R02 250 600 700 <135 20 GTCX25-261M-R02 260 700 800 <135 20 GTCX25-301M-R02 300 800 900 <150 20 GTCX25-351M-R02 350 900 1000 <150 20 GTCX25-401M-R02 400 900 1000 <150 20 GTCX25-421M-R02 420 900 1000 <150 20 GTCX25-471M-R02 470 1050 1150 <150 20 GTCX25-501M-R02 500 1100 1200 <150 20 GTCX25-551M-R02 550 1300 1400 <150 20 GTCX25-601M-R02 600 1300 1400 <150 20 Note:X options: S: Surface-mount; A: Axial-leaded; N: No-leaded PartMarking : XX = lot code Device Surge Rating, Capacitance, Insulation Resistance, UL Listing AC Impulse Discharge Impulse Insulation UL Part Number Discharge Current Capacitance Life Resistance Rating Current (1sec duration; 10 hits) 8x20µs 10x1000µs @50 Hz @1Mhz @100V* UL497B 10 hits 300 hits #E179610 GTCX25-xxxM-R02 2.5kA 100A 2.5Arms <1pF 10,000 (MΩ) All Devices Devices <=90V measured @ 50V Devices >=500V measured @ 250V © 2016 Littelfuse,Inc. Document: SCD27304 Specifications are subject to change without notice. Status: Released Revised July 26,2016 2 Rev: B Date: JULY 26, 2016

Gas Discharge Tubes GTCX25-XXXM-R02 Series DIMENSIONS = MILLIMETERS [INCHES] Product Dimensions Surface-mount (GTCS25-XXXM-R02) No Leads (GTCN25-XXXM-R02) Axial Leads (GTCA25-XXXM-R02) Pad Layout – Surface- mount Devices (GTCS25-XXXM-R02) X Y Z NOM NOM NOM mm: 6.0 3.9 1.3 in*: (0.197) (0.154) (0.051) © 2016 Littelfuse,Inc. Document: SCD27304 Specifications are subject to change without notice. Status: Released Revised July 26,2016 3 Rev: B Date: JULY 26, 2016

Gas Discharge Tubes GTCX25-XXXM-R02 Series GTCX25-XXXM-R02 Series General Characteristics No Radioactive Material Storage Temperature: -40ºC to +90ºC Operating Temperature: -40ºC to +90ºC Body: Nickel Plated Leads: Surface-mount, Axial Devices: Tin Plated Devices with No Leads: Nickel Plated Soldering Note: Devices with no leads are non-solderable; meant for insertion into magazine clips m Packaging Information Part Description Tray / Reel Standard Package No Leads: GTCN25-XXXM-R02 200pcs 5,000pcs Axial Leads: GTCA25-XXXM-R02 100pcs 1,000pcs Surface-mount: GTCS25-XXXM-R02 1,500pcs (Reel) 12,000pcs Part Numbering System Example Part Number: GTCX25-351M-R02 GT = Gas Tube C = Ceramic X = Lead Configuration: N= No leads; A= Axial Leads; S= Surface-mount 2 = 2 Electrode device 5 = 5mm Diameter 351 = DC Spark Over Voltage of 350V (at 100V/s) M = Tolerance of 20% on DC Spark Over Voltage R = Product Family Designator 02 = Surge rating: 8x20µs 2.5kA 10 times GTCX25-XXXM-R02 Series © 2016 Littelfuse,Inc. Document: SCD27304 Specifications are subject to change without notice. Status: Released Revised July 26,2016 4 Rev: B Date: JULY 26, 2016

Gas Discharge Tubes GTCX25-XXXM-R02 Series Part Marking Reference Guide Example Part Marking: 35 R02 GN = Manufacture Mark 35 = Voltage Designator (35 = 350V) R02 = Product Family Designator + Surge Current 2.5kA (8x20µs 10 hits) GN = Year and Week of Manufacture Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. © 2016 Littelfuse,Inc. Document: SCD27304 Specifications are subject to change without notice. Status: Released Revised July 26,2016 5 Rev: B Date: JULY 26, 2016