UUUllltttrrraaa---HHHiiiggghhh VVVaaallluuueee UUUllltttrrraaa---HHHiiiggghhh VVVaaallluuueee WWWelwynelwynelwyn ComponentsComponentsComponents PPPrrreeeccciiisssiiiooonnn RRReeesssiiissstttooorrrsss WWWelwynelwynelwyn ComponentsComponentsComponents PPPrrreeeccciiisssiiiooonnn RRReeesssiiissstttooorrrsss Ultra-High Value RResisesisttoorrss Ultra-High Value Resistors Welwyn Components Precision Resistors Precision Resistors Welwyn Components 333888111000 SSSeeerrriiieeesss Ultra-High Value Ultra-High Value 333888111000 SSSeeerrriiieeesss Ultra-High Value RRReeesssiiissstttaaannnccceee rrraaannngggeee uuuppp tttooo 111000000 TTT ooohhhmmmsss RRReeesssiiissstttaaannnccceee rrraaannngggeee uuuppp tttooo 111000000 TTT ooohhhmmmsss Precision Resistors Precision Resistors Precision 111444 Resistors 3810 Series 111444 381(((0111 S000erieooos hhhmmmsss))) (((111000 ooohhhmmmsss))) DesignedDesignedDesigned forforfor lowlowlow curcurcurrrrententent (picoampe(picoampe(picoamperrreee level)level)level) Resistance range up to 100 T ohms 3810 SeriesDesignedDesignedDesigned forforfor lowlowlow curcurcurrrrententent (picoampe(picoampe(picoamperrreee level)level)level) Resistance range up to 100 T ohms 3810 Series 3810 Series 14 (1014 ohms) measumeasumeasurrrementsementsements (10 ohms) measumeasumeasurrrementsementsements 14 14 Resistance range up to 100 T ohms (10 ohms) 14 Resistance range up to 100 T ohms (10 ohms) Designed for low current (picoampere level) Resistance range up to 100 T ohms (10 ohms) DesignedLowLowLow voltagevoltagevoltage for low coecoecoe curfffficientficientficientrent (picoampere level) LowLowLow voltagevoltagevoltage coecoecoefffficientficientficient Designed for low current (picoampere level) measurements measuDesigned frementsor low current (picoampere level) measurements Designed for low current (picoampere level) measurements measurements HermeticallyHermeticallyHermetically sealedsealedsealed Low voltage HermeticallyHermeticallyHermetically sealedsealedsealed Low voltage coefficient Low voltage Low voltage coefficient Low voltage coefficient sealed LeakageLeakageLeakage curcurcurrrrententent minimisedminimisedminimised bybyby hermetichermetichermetic Hermetically sealed sealed LeakageLeakageLeakage curcurcurrrrententent minimisedminimisedminimised bybyby hermetichermetichermetic Hermetically sealed Hermetically sealed Leakage current minimised by sealing and guard ring sealingsealingsealing andandand guaguaguarrrddd ringringring Leakage current minimised by hermetic sealing and guard ring Leakage current minimised by sealing and guard ring sealingsealingsealing andandand guaguaguarrrddd ringringring Leakage current minimised by hermetic Leakage current minimised by hermetic sealing and guard ring sealing and guard ring All parts are Pb-free and comply with EU 2011/65/EU (RoHS2) AllAll partsparts araree Pb-Pb-frfreeee andand ccomplyomply withwith EUEU DirDirectivectivee 2011/65/EU2011/65/EU amendedamended bbyy (EU)(EU) 2015/8632015/863 (R(RoHS3)oHS3) All parts are Pb-free and comply with EU 2011/65/EU (RoHS2) EEEllleeeccctrtrtriiicccaaalll DDDaaatttaaa EEEllleeeccctrtrtriiicccaaalll DDDaaatttaaa Electrical Data Electrical Data 333888111000 333888111111 333888111222 333888111000 333888111111 333888111222 RRReeesssiiissstttaaannnccceee rrraaannngggeee ooohhhmmmsss 111000000MMM tttooo 111TTT 111000000MMM tttooo 111TTT 111TTT tttooo 111000000TTT 3810 3811 3812 RRReeesssiiissstttaaannnccceee rrraaannngggeee ooohhhmmmsss 111000000MMM tttooo 111TTT 111000000MMM tttooo 111TTT 111TTT tttooo 111000000TTT 3810 3811 3812 Resistance range ohms 100M to 1T 100M to 1T 1T to 100T LLLiiimmmiiitttiiinnnggg eeellleeemmmeeennnttt vvvooollltttaaagggeee vvvooollltttsss 555000000 111000000000 111000000000 Resistance range ohms 100M to 1T 100M to 1T 1T to 100T LLLiiimmmiiitttiiinnnggg eeellleeemmmeeennnttt vvvooollltttaaagggeee vvvooollltttsss 555000000 111000000000 111000000000 Limiting element voltage volts 500 1000 1000 TTTCCCRRR (((222000CCC tttooo 777000CCC))) ppppppmmm///CCC ---555000000 tttooo ---333555000000 Limiting element voltage volts 500 1000 1000 TTTCCCRRR (((222000CCC tttooo 777000CCC))) ppppppmmm///CCC ---555000000 tttooo ---333555000000 TCR (20C to 70C) ppm/C -500 to -3500 RRReeesssiiissstttaaannnccceee tttooollleeerrraaannnccceee %%% 111000,,, 222000 111,,, 222,,, 555,,, 111000 1T1T1T tttooo101010TTT 2,2,2, 555,,,111000 >10>10>10TTT 555,,,101010 TCR (20C to 70C) ppm/C -500 to -3500 RRReeesssiiissstttaaannnccceee tttooollleeerrraaannnccceee %%% 111000,,, 222000 111,,, 222,,, 555,,, 111000 1T1T1T tttooo101010TTT 2,2,2, 555,,,111000 >10>10>10TTT 555,,,101010 Resistance tolerance % 10, 20 1, 2, 5, 10 1T to10T 2, 5,10 >10T 5,10 Resistance tolerance % 10, 20 1, 2, 5, 10 1T to10T 2, 5,10 >10T 5,10 VVValuesaluesalues E24E24E24 ppprrreferefereferrrrededed VVValuesaluesalues E24E24E24 ppprrreferefereferrrrededed Values E24 preferred Values E24 preferred AAAmmmbbbiiieeennnttt ttteeemmmpppeeerrraaatttuuurrreee rrraaannngggeee CCC ---444000 tttooo 111000000 AAAmmmbbbiiieeennnttt ttteeemmmpppeeerrraaatttuuurrreee rrraaannngggeee CCC ---444000 tttooo 111000000 Ambient temperature range C -40 to 100 Ambient temperature range C -40 to 100 PhyPhyPhysssiiicccaaalll DDDaaatttaaa PhyPhyPhyPhyssssiiiiccccaaaal lll DDDDaaaatatttaaa Physical Data DimensionsDimensionsDimensions (mm)(mm)(mm) &&& WWWeighteighteight (g)(g)(g) Dimensions (mm) & Weight (g) DimensionsDimensionsDimensions (mm)(mm)(mm) &&& WWWeighteighteight (g)(g)(g) Dimensions (mm) & Weight (g) PCPCPCBBB Min.Min.Min. PCB Min. PCPCPCBBB Min.Min.Min. PCB Min. TTTTypypypypeeee L maLLL mamamax xxx D maDDD mamamax xxx f minfff mimiminnnd nomddd nomnomnommountingmountingmountingmountingBend BenBenBenWt.ddd nomWt.Wt.Wt. nomnomnom TTTTypypypypeeee L maLLL mamamax xxx D maDDD mamamax xxx f minfff mimiminnnd nomddd nomnomnommountingmountingmountingmountingBend BenBenBenWt.ddd nomWt.Wt.Wt. nomnomnom Centres Radius CentCentCentrrreeesss RadiusRadiusRadius Centres Radius d CentCentCentrrreeesss RadiusRadiusRadius ddd d D ddd DDD 3810 25.0 6 30 0.6 29.2 0.6 1.5 D 381038103810 25.25.25.000 666 333000 0.0.0.666 29.29.29.222 0.0.0.666 1.51.51.5 DDDL 3810 25.0 6 30 0.6 29.2 0.6 1.5 f LLL 381038103810 25.25.25.000 666 333000 0.0.0.666 29.29.29.222 0.0.0.666 1.51.51.5 L fff f LLL fff 3811 42.9 6 30 0.6 47.1 0.6 2.2 381138113811 42.42.42.999 666 333000 0.0.0.666 47.47.47.111 0.0.0.666 2.22.22.2 3811 42.9 6 30 0.6 47.1 0.6 2.2 381138113811 42.42.42.999 666 333000 0.0.0.666 47.47.47.111 0.0.0.666 2.22.22.2 3812 48.0 6 30 0.6 52.2 0.6 2.5 3812 48.0 6 30 0.6 52.2 0.6 2.5 381238123812 48.48.48.000 666 333000 0.0.0.666 52.52.52.222 0.0.0.666 2.52.52.5 381238123812 48.48.48.000 666 333000 0.0.0.666 52.52.52.222 0.0.0.666 2.52.52.5 Construction Marking Construction Marking ConstructionConstructionConstruction MarkingMarkingMarking The Cermetox resistive film is fired onto high quality ceramic The serial number, resistance value and tolerance code are legend ConstructionConstructionConstruction MarkingMarkingMarking The Cermetox resistive film is fired onto high quality ceramic The serial number, resistance value and tolerance code are legend TheTheThe CermetoxCermetoxCermetox rrresistiveesistiveesistive filmfilmfilm isisis fififirrrededed ontoontoonto highhighhigh qualityqualityquality ceramicceramicceramic TTThhheee ssseeerrriiiaaalll nnnuuummmbbbeeerrr,,, rrreeesssiiissstttaaannnccceee vvvaaallluuueee aaannnddd tttooollleeerrraaannnccceee cccooodddeee aaarrreee llleeegggeeennnddd substrate brass end caps are forced fitted to the substrate marked. The resistance value marking conforms to IEC 62. TheTheThe CermetoxCermetoxCermetox rrresistiveesistiveesistive filmfilmfilm isisis fififirrrededed ontoontoonto highhighhigh qualityqualityquality ceramicceramicceramic TTThhheee ssseeerrriiiaaalll nnnuuummmbbbeeerrr,,, rrreeesssiiissstttaaannnccceee vvvaaallluuueee aaannnddd tttooollleeerrraaannnccceee cccooodddeee aaarrreee llleeegggeeennnddd substrate brass end caps are forced fitted to the substrate marked. The resistance value marking conforms to IEC 62. substrate substrate substrate brassbrassbrass endendend capscapscaps aaarrreee fofoforrrcedcedced fittedfittedfitted tototo thethethe substratesubstratesubstrate mmmaaarrrkkkeeeddd... TTThhheee rrreeesssiiissstttaaannnccceee vvvaaallluuueee mmmaaarrrkkkiiinnnggg cccooonnnfffooorrrmmmsss tttooo IIIEEECCC 666222... which is then adjusted to value with a helical cut in the film substrate substrate substrate brassbrassbrass endendend capscapscaps aaarrreee fofoforrrcedcedced fittedfittedfitted tototo thethethe substratesubstratesubstrate mmmaaarrrkkkeeeddd... TTThhheee rrreeesssiiissstttaaannnccceee vvvaaallluuueee mmmaaarrrkkkiiinnnggg cccooonnnfffooorrrmmmsss tttooo IIIEEECCC 666222... which is then adjusted to value with a helical cut in the film whichwhichwhich isisis thenthenthen adjustedadjustedadjusted tototo valuevaluevalue withwithwith aaa helicalhelicalhelical cutcutcut ininin thethethe film film film the leads are mechanically locked into the end caps and the Solvent Resistance whichwhichwhich isisis thenthenthen adjustedadjustedadjusted tototo valuevaluevalue withwithwith aaa helicalhelicalhelical cutcutcut ininin thethethe film film film the leads are mechanically locked into the end caps and the Solvent Resistance assemblythethethe leadsleadsleads sealed aaarrreee mechanicallymechanicallymechanically into the glass lockedlockedlockedenvelope. intointointo All thethethe close endendend tolerance capscapscaps andandand thethetheThe glassSolventSolventSolvent envelope ResistanceResistanceResistance is coated with silicone and should not be assemblythethethe leadsleadsleads sealed aaarrreee mechanicallymechanicallymechanically into the glass lockedlockedlockedenvelope. intointointo All thethethe close endendend tolerance capscapscaps andandand thethetheThe glassSolventSolventSolvent envelope ResistanceResistanceResistance is coated with silicone and should not be units utilise two resistors connected in series within the glass subjected to solvents or their vapours. (See Application assemblyassemblyassembly sealedsealedsealed intointointo thethethe glassglassglass envelope.envelope.envelope. AllAllAll closecloseclose tolerancetolerancetolerance TheTheThe glassglassglass envelopeenvelopeenvelope isisis coatedcoatedcoated withwithwith siliconesiliconesilicone andandand shouldshouldshould notnotnot bebebe units utilise two resistors connected in series within the glass subjected to solvents or their vapours. (See Application assemblyassemblyassembly sealedsealedsealed intointointo thethethe glassglassglass envelope.envelope.envelope. AllAllAll closecloseclose tolerancetolerancetolerance TheTheThe glassglassglass envelopeenvelopeenvelope isisis coatedcoatedcoated withwithwith siliconesiliconesilicone andandand shouldshouldshould notnotnot bebebe envelope. The guard band is described, with application Notes.) unitsunitsunits utiliseutiliseutilise twotwotwo rrresistorsesistorsesistors connectedconnectedconnected ininin seriesseriesseries withinwithinwithin thethethe glassglassglass subjectedsubjectedsubjected tototo solventssolventssolvents ororor theirtheirtheir vapours.vapours.vapours. (See(See(See ApplicationApplicationApplication envelope. The guard band is described, with application Notes.) unitsunitsunits utiliseutiliseutilise twotwotwo rrresistorsesistorsesistors connectedconnectedconnected ininin seriesseriesseries withinwithinwithin thethethe glassglassglass subjectedsubjectedsubjected tototo solventssolventssolvents ororor theirtheirtheir vapours.vapours.vapours. (See(See(See ApplicationApplicationApplication notes, at notes,envelope.envelope.envelope. at TheTheThe guaguaguarrrddd bandbandband isisis described,described,described, withwithwith applicationapplicationapplication Notes.)Notes.)Notes.) envelope.envelope.envelope.Ultra-High Value Ultra-High Value Ultra-High Value Precision Resistors Precision Resistors Precision Resistors 3810 Series 3810 Series Welwyn Components 3810 Series Performance Data Maximum Typical Load at rated voltage: 1000 hours at 20C R% 2 1 Shelf life: 12 months at room temperature R% 1 0.5 Resistance to solder heat R% 0.2 <0.1 3810 pF 0.4 Capacitance 3811 pF 0.2 Voltage coefficient of resistance ppm/volt 100M 1T 100T Measured at voltages 3810 -20 -160 of 100 and 500 volts 3811 -10 -80 3812 -10 -80 -150 Application Notes Each resistor is packed with a card stating nominal resistance Guard Band value at 100 V applied, selection tolerance, date and serial For details of how to use the guard band, fitted to resistors of number. 100 G ohms and over, see