3RD-8S Gas Discharge Tube Arresters 3 Poles Electrodes 75V-600V 20KA 8mmX10mm SMD Type GDT
Description of 3RD-8S Gas Discharge Tube
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.
Features of 3 Poles Electrodes Gas Discharge Tube
• 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
• Size: Ф8mm*10mm
• Storage and operational temperature: -40~+90°C
Applications of 75V-600V Gas Discharge Tube Arresters
• 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 20KA GDT Gas Discharge Tube
| 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 |
| V | V | V | GΩ | pF | KA | KA | A | Times |
| 3R075SD-8S | 75±20% | 500 | 600 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R090SD-8S | 90±20% | 500 | 600 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R150SD-8S | 150±20% | 500 | 600 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R230SD-8S | 230±20% | 600 | 700 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R250SD-8S | 250±20% | 600 | 700 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R350SD-8S | 350±20% | 800 | 900 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R420SD-8S | 420±20% | 850 | 950 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R470SD-8S | 470±20% | 900 | 1000 | 1 | 1.5 | 20 | 25 | 20 | 300 |
| 3R600SD-8S | 600±20% | 1100 | 1200 | 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 temperature………………………………..….......... -40~+90°C |
| Climatic category (IEC60068-1) 40/90/21 |
| Weight ~2.0g |
Surface treatment………………………………………….....…………......... 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~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. |
| Symbol | Millimeters | Inches |
| A | 8±0.2 | 0.315±0.008 |
| B | 8±0.2 | 0.315±0.008 |
| C | 10±0.3 | 0.394±0.012 |
| D | Φ8±0.2 | Φ0.315±0.008 |
| E | Φ7.2±0.1 | Φ0.283±0.004 |
| F | 0.5±0.1 | 0.020±0.004 |
| G | 1.5±0.1 | 0.059±0.004 |
| H | 0.5±0.1 | 0.020±0.004 |
| X | 1.5 | 0.059 |
| X1 | 1.5 | 0.059 |
| X2 | 10.0 | 0.394 |
| Y | 6.0 | 0.236 |
| Symbol | Millimeters | Inches |
| W | 16±0.3 | 0.630±0.012 |
| A0 | 10.5±0.1 | 0.413±0.004 |
| B0 | 8.3±0.1 | 0.327±0.004 |
| K0 | 8.4±0.1 | 0.331±0.004 |
| P | 16±0.1 | 0.630±0.004 |
| F | 7.5±0.1 | 0.295±0.004 |
| E | 1.75±0.1 | 0.069±0.004 |
| D | 1.5+0.1/-0.0 | 0.059+0.004/-0.0 |
| P0 | 4±0.1 | 0.157±0.004 |
| P2 | 2±0.1 | 0.079±0.004 |
| T | 0.4±0.1 | 0.016±0.004 |
| D0 | 13.3±0.15 | 0.524±0.006 |
| D1 | 330±2 | 12.992±0.079 |
| D2 | 100+1/-2 | 3.937+0.039/-0.079 |
| W1 | 16.5±0.4 | 0.65±0.016 |
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 |
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3RD-8S GDT Gas Discharge Tube Arresters 3 Poles Electrodes 75V-600V 20KA 8mmX10mm SMD Type GDT Images
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