Gas Discharge Tube (GDT) Products PMT3(310) Series PMT3(310) Series RoHS Description Littelfuse three electrode PMT3(310) series GDTs are designed primarily to protect telecommunications equipment requiring simultaneous crowbar action of two signal lines. GDTs function as switches; dissipating a minimum amount of energy and can handle much higher currents than other types of transient voltage protection. Features •Rugged ceramic-metal construction •Low capacitance (<1.5 pF) •Available with or without fail-safe clip Agency Approvals AGENCY AGENCY FILE NUMBER E128662 Applications 3 Electrode GDT Graphical Symbol a b •Available with or without leads •Available with various lead spacings • Tested to REA PE-80 •Telephone interface •Telephone line cards •Repeaters a = TIP b = RING e = GROUND (center electrode) •Modems •Line test equipment e Electrical Characteristics Device Specifications Part Number DC Breakdown (I-g) @500V/s DC Voltage 100 V/ μSec. DC Insulation CapaciVoltage Resistance tance 1kV/ (@1Mhz) μSec. Min Min Typ Max PMT3(310)075 60 75 90 500 650 PMT3(310)090 72 90 108 500 650 PMT3(310)150 120 150 180 500 600 PMT3(310)230 184 230 276 600 700 PMT3(310)250 200 250 300 600 700 PMT3(310)350 280 350 900 1000 420 Life Ratings PMT3(310)400 320 400 480 900 1000 PMT3(310)500 400 500 600 1100 1200 AC Current 11 cycles @ 50-60Hz1 Max Single Surge 8/20 μSec1 Max Single Surge 10/350 μSec1 Surge Life 10/1000 μSec x 4001 25kA 5kA 1kA 1010 Ω (at 50V) 1.5 pf 130Amps 1010 Ω (at 100V) NOTES: 1. Total current through center electrode, tested in accordance with ITU-T Rec K.12 and REA PE 80 End of life DC: 50% of minimum initial DC breakdown voltage to 150% of maximum initial DC breakdown voltage limit. Impulse: less than 150% of initial impulse breakdown down limit. © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 01/13/15 AC Surge Current Current 50Hz 1Sec. 8/20μSec x101 x101 20Amps 20kA Gas Discharge Tube (GDT) Products PMT3(310) Series Product Characteristics Materials Dull Tin Plate 17.5 ± 12.5 Microns with Ceramic Insulator Storage and Operational Temperature -40 to +90°C Product Marking Littelfuse ‘LF’ marking, Voltage and date code. Transverse Voltage (Delay Time) Tested to ITU-T Rec. K.12 < 0.2µSec Glow to arc transition current ~ 1Amp Arc Voltage ~ 10 to 35 Volts Glow Voltage ~ 60-200 Volts Holdover Voltage Tested to ITU-T Rec. K.12 & REA PE 80 < 150mS Soldering Parameters - Reflow Soldering (Surface Mount Devices) Pb – Free assembly Pre Heat - Temperature Min (Ts(min)) 150°C - Temperature Max (Ts(max)) 200°C - Time (Min to Max) (ts) 60 – 180 secs 3°C/second max TS(max) to TL - Ramp-up Rate 5°C/second max - Temperature (TL) (Liquidus) 217°C - Temperature (tL) 60 – 150 seconds 260 Time within 5°C of actual peak Temperature (tp) 10 – 30 seconds tL Ramp-down Preheat TS(min) 25 Peak Temperature (TP) +0/-5 Critical Zone TL to TP Ramp-up TL TS(max) Average ramp up rate (Liquidus Temp (TL) to peak Reflow tP TP Temperature Reflow Condition tS time to peak temperature (t 25ºC to peak) Time °C Ramp-down Rate 6°C/second max Time 25°C to peak Temperature (TP) 8 minutes Max. Do not exceed 260°C Soldering Parameters - Hand Soldering Solder Iron Temperature: 350° C +/- 5°C Heating Time: 5 seconds max. Soldering Parameters - Wave Soldering (Thru-Hole Devices) Recommended Process Parameters: 280 Wave Parameter 260 Lead-Free Recommendation Preheat: 240 220 (Depends on Flux Activation Temperature) 200 180 160 140 120 100 80 60 (Typical Industry Recommendation) Temperature Minimum: 100° C Temperature Maximum: Preheat Time: 150° C 60-180 seconds Solder Pot Temperature: 280° C Maximum Solder Dwell Time: 2-5 seconds 40 Time (Seconds) 230 240 220 210 200 190 180 170 160 150 140 130 120 110 90 100 80 70 60 50 40 20 0 0 30 20 10 Temperature (°C) - Measured on bottom side of board 300 Note: Surge Arrestors with a Failsafe mechanism should be individually examined after soldering Cooling Time Preheat Time Dwell Time © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 01/13/15 Gas Discharge Tube (GDT) Products PMT3(310) Series Packaging Device Dimensions NOTE: Failsafe option dimensions shown in green. Type 01 - Surface Mount Core Mounting Area 9.0 [0.354] 11.8 [0.464] 10.10 [0.398] 8.1 [0.319] 0.3mm Minimum Gap 9.9 [0.354] Device Type 12.4 ± 1 [0.488 ± 0.039] 100pcs/tray x 5 trays per carton 500 Type 04 100pcs/tray x 5 trays per carton 500 Type 06 100pcs/tray x 5 trays per carton 500 Type 14 50pcs/tray x 5 trays per carton 250 Available Package Option Type 01 PMT3(310)150 PMT3(310)230 X PMT3(310)250 16.8 [0.661] X X X X X X 8.1. [0.319] 4.4 [0.173] Type 14 PMT3(310)090 10.10 [0.398] 15 [0.590] Type 06 X Mounting Area 9.0 [0.354] 9.9 [0.354] Type 04 PMT3(310)075 11.8 [0.464] 0.3mm Minimum Gap Quantity Type 01 Part Number Type 04 - Shaped Radial Leads Description X X PMT3(310)350 X X X PMT3(310)400 X X PMT3(310)500 X X 1.0 DIA. [0.039] Part Numbering System 4.4± 0.3 [0.173± 0.12] 4.4± 0.3 [0.173± 0.12] PMT3(310) XXX XX X Type 06 - Straight Radial Leads Series PMT3(310) 14.7 [0.579] 11.8 [0.464] Mounting Area 9.0 [0.354] 10.10 [0.398] 8.1 DIA. MAX. [0.319] 0.3mm Minimum Gap 9.9 [0.354] Breakdown Voltage 075 = 75V 090 = 90V 150 = 150V 230 = 230V 250 = 250V 350 = 350V 400 = 400V 500 = 500V Device Type 15 [0.590] 1.0 DIA. [0.039] 16.8 [0.661] 6.35 ± 0.5 [0.25 ± 0.25] Packaging Option Code 6.35 ± 0.5 [0.25 ± 0.25] Blank = No Failsafe F = With Failsafe Type 14 - Straight "T" Leads 50 ± 3 [1.968 ± 0.118 ] Mounting Area 9.0 [0.354] 11.8 [0.464] 10.10 [0.398] 8.1 DIA. MAX. [0.319] 0.3mm Minimum Gap 23.8 [0.937] 22 [0.866] © 2015 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 01/13/15 See Dimensions section: 01 = Type 01 04 = Type 04 06 = Type 06 14 = Type 14 1.0 DIA. [0.039] X