GTCS25-251M-R02-2

Gas Discharge Tubes Gas Discharge Tubes TE Circuit Protection’s GDTs (Gas Discharge Tubes) are placed in front of, and in parallel with, sensitive telecom equipment such as power lines, communication lines, signal lines and data transmission lines to help protect them from damage caused by transient surge voltages that may result from lightning strikes and equipment switching operations. These devices do not influence the signal in normal operation. However, in the event of an overvoltage surge, such as a lightning strike, the GDT switches to a low impedance state and diverts the energy away from the sensitive equipment. Our GDTs offer a high level of surge protection, a broad voltage range, low capacitance, and many form factors including new surface mount devices, which makes 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. Their low capacitance also results in less signal distortion. When used in a coordinated circuit protection solution with PolySwitch devices, they can help equipment manufacturers meet stringent safety regulatory standards. Benefits Features • Helps provide overvoltage fault protection against damage caused by high energy surges • Suitable for use in sensitive equipment due to impulse sparkover response • Suitable for high-frequency applications 10 • RoHS compliant • Halogen free (refers to: Brⱕ900ppm, Clⱕ900ppm, Br+Clⱕ1500ppm) • Wide range of voltages (75V-4000V) • Wide range of form factors (3mm, 5mm, 6mm, 7mm, 8mm diameter devices) • Highly reliable performance • New surface-mount devices for automated manufacturing • Low capacitance and insertion loss • Crowbar device with low arc voltage • High accuracy spark-over voltages for high precision designs • Devices tested per ITU K.12 recommendations • Various lead configurations and surface-mount options • Optional fail-short mechanism • Non radioactive materials • Devices certified to UL497B and UL1449 Applications OBSOLETE • Telecommunications - MDF modules, xDSL equipment, RF systems, antenna, base stations • Industrial and Consumer Electronics - Power supplies, surge protectors, alarm systems, irrigation systems NOT the LATEST REVISION 63 Figure G1-G2 Typical Circuits for Gas Discharge Tubes Figure G1 Figure G2 Two Electrode Devices for Ungrounded Circuits PolySwitch Device (A) Telecom Line Three Electrode Devices for Grounded Circuits Protected Equipment GDT (B) PolySwitch Device (A) (A’) Telecom Line Thyristor (B’) (A’) Protected Equipment GDT (B) Thyristors (B’) PolySwitch Device Table G1 Device Voltage Ratings, Surge Rating, Capacitance, Insulation Resistance, and Agency Approval for Two Electrode Gas Discharge Tubes DC Sparkover Voltage Part Number Impulse Sparkover Voltage @ 100V/s ± 20% Tolerance @ 1kV/µs 75* 600 90 600 140 600 GTCS23-XXXM-R01-2 GTCC23-XXXM-R01-2 10 150 600 200 700 230 700 300 900 350 1000 400 1000 Impulse Discharge Current Impulse Withstanding Voltage Capacitance Insulation Resistance UL Rating 8x20µs 10 hits (5 hits each polarity) 8x20µs 300 hits (150 hits each polarity) 10/700µs 10 hits (5 times each polarity) @1MHz @100VDC† UL497B #E179610 1kA 100A 4kV