20KA Gas Discharge Tubes GDT 3RD-8 Series Surge Protector Arrester
75V-800V Arrestor DIP and SMD Circuit Protection Components
Description of 3RD-8 Series Gas Discharge Tubes GDT
GDT is 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 GDT 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
Main Distribution Frame (MDF) 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.
Electrical Symbol of 20KA Gas Discharge Tubes GDT
Features of 75V-800V Arrestor Gas Discharge Tubes
• Excellent response to fast rising transients
• Stable breakdown voltage
• GHz working frequency
• 8/20μs Impulse current capability: 20KA
• Non-Radioactive
• Ultra Low capacitance (<1.5pF)
• High insulation resistance
• Lead-free compliant
• RoHS and REACH compliant
• UL 497B Recognized: E465335
• Size: Ф8mm*10mm
• Storage and operational temperature: -40~+90°C
Applications of DIP and SMD Gas Discharge Tubes
• Communication equipment
• CATV equipment
• Data lines
• Power supplies
• Telecom SLIC protection
• Broadband equipment
• ADSL equipment, including ADSL2+
• XDSL equipment
• Satellite and CATV equipment
• Test equipment
• Consumer electronics
Electrical Characteristics of 3RD-8 Series GDT 20KA Gas Discharge Tubes
| Part Number | DC
Spark-over Voltage 1) 2) 3) @100V/S | Impulse Spark-over Voltage 3) | Insulation Resistance
4) | Capacitance @1MHz | Life Ratings |
Impulse Discharge Current
@8/20μs 5) | AC
Discharge Current @50Hz 1S 5) | Impulse Life @10/1000μS 200A 5) |
| 100V/μS | 1KV/μS |
| Max | Max | Min | Max | Nominal
±5 times | Max 1 time | Nominal 5 times | Min |
| DIP | SMD | DIP-F | DIP-T | V | V | V | GΩ | pF | KA | KA | A | Times |
| 3R075TD-8 | 3R075SD-8 | 3R075TD-8F | 3R075TD-8T | 75±20% | 500 | 600 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R090TD-8 | 3R090SD-8 | 3R090TD-8F | 3R090TD-8T | 90±20% | 500 | 600 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R150TD-8 | 3R150SD-8 | 3R150TD-8F | 3R150TD-8T | 150±20% | 500 | 600 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R200TD-8 | 3R200SD-8 | 3R200TD-8F | 3R200TD-8T | 200±20% | 600 | 700 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R230TD-8 | 3R230SD-8 | 3R230TD-8F | 3R230TD-8T | 230±20% | 600 | 700 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R250TD-8 | 3R250SD-8 | 3R250TD-8F | 3R250TD-8T | 250±20% | 600 | 700 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R350TD-8 | 3R350SD-8 | 3R350TD-8F | 3R350TD-8T | 350±20% | 800 | 900 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R400TD-8 | 3R400SD-8 | 3R400TD-8F | 3R400TD-8T | 400±20% | 850 | 950 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R420TD-8 | 3R420SD-8 | 3R420TD-8F | 3R420TD-8T | 420±20% | 850 | 950 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R470TD-8 | 3R470SD-8 | 3R470TD-8F | 3R470TD-8T | 470±20% | 900 | 1000 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R600TD-8 | 3R600SD-8 | 3R600TD-8F | 3R600TD-8T | 600±20% | 1100 | 1200 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R800TD-8 | 3R800SD-8 | 3R800TD-8F | 3R800TD-8T | 800±20% | 1400 | 1500 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| Glow Voltage at
10mA.......................................................................
~60V |
| Arc Voltage at 1A ~10V |
| Glow to Arc transition Current………………………………………….. ~1A |
| Operation and storage -40~+90°C |
| Climatic category (IEC60068-1)……………………………………….. 40/90/21 |
Weight…………………………………………………………………….
. | DIP SMD DIP-F
DIP-T | ~2.10g
~1.85g
~2.35g
~2.15g |
Surface treatment………………………………………….....…………. DIP -Nickel Plated
SMD -Matte-tin plated |
1) At delivery AQL 0.65 level II, DIN ISO 2859
2) In ionized mode
3) Tip or ring electrode to center electrode
4) Insulation Resistance Measuring Voltage:
75V at DC 25V
90V~IEC 61643-311, GB/T 9043.150V at DC 50V
Other at DC 100V
5) Total current through center electrode, half value through tip
respectively ring electrode. Terms in accordance with ITU-T Rec.
K.12,IEC 61643-311, GB/T 9043. |
Soldering Parameters - Wave soldering (Thru-Hole Devices)
| Wave Soldering Condition | Pb-Free assembly |
| Preheat | Temperature Min | 100°C |
| Temperature Max | 150°C |
| Time (Min to Max) | 60-180 Seconds |
| Solder Pot Temperature | 280°C Max |
| Solder Dwell Time | 2-5 Seconds |
Soldering Parameters - Reflow Soldering (Surface Mount Devices)
| Reflow Condition | Pb - Free assembly |
| Pre Heat | -Temperature Min (Ts(min)) | 150°C |
| -Temperature Max (Ts(max)) | 200°C |
| - Time (min to max) (ts) | 60 -180 Seconds |
| Average ramp up rate ( Liquids Temp TL) to peak | 3°C/second max |
| TS(max) to TL - Ramp-up Rate | 5°C/second max |
| Reflow | - Temperature (TL) (Liquids) | 217°C |
| - Time (min to max) (ts) | 60 -150 Seconds |
| Peak Temperature (TP) | 260 +0/-5°C |
| Time within 5°C of actual peak Temperature (tp) | 10 - 30 Seconds |
| Ramp-down Rate | 6°C/second max |
| Time 25°C to peak Temperature (TP) | 8 minutes Max |
| Do not exceed | 260°C |
