High Voltage High Voltage High Voltage Welwyn Components Metal Film Resistors Metal Film Resistors Welwyn Components Metal Film Resistors MH SeriesMH Series MH Series MH37 meets requirements of BSEN 60065 BSEN 60065 Approval for MH37 in value range 680K to 3Min value range 680K to 3M BSEN 60065 Approval for MH37 High working voltage to 3.5KVHigh working voltage to 3.5KV in value range 680K to 3M Small size Small size High working voltage to 3.5KV High pulse load capability High pulse load capability Small size Robust cement coating Robust cement coating High pulse load capability Value up to 10M Value up to 10M Robust cement coating Value up to 10M Electrical Data Electrical Data MH25 MH37 Power rating at 70C max watts 0.25 0.5 MH25 MH37 Resistance range ohms 100K - 10M 100K - 3M Power rating at 70C max watts 0.25 0.5 Limiting element voltage volts dc or ac peak 1,600 3,500 Resistance range ohms 100K - 10M 100K - 3M Isolation voltage volts 700 Limiting element voltage volts dc or ac peak 1,600 3,500 TCR ppm/C 100 Isolation voltage volts 700 Resistance tolerance % 1, 2, 5 TCR ppm/C 100 Standard values E24 and E96 preferred Resistance tolerance % 1, 2, 5 Thermal impedance C/watt 140 112 Standard values E24 and E96 preferred Ambient temperature range C - 55 to 155 Thermal impedance C/watt 140 112 Ambient temperature range C - 55 to 155 Physical Data Physical Data Dimensions (mm) and Weight (g) PCB Min Dimensions (mm) and Weight (g) mounting Bend PCB Min d Type L max D max f min d nom centres Radius Wt.nom D mounting Bend L f MH25 6.2 2.5 21.0 0.6 10.2 0.6 0.3 d Type L max D max f min d nom centres Radius Wt.nom D L f MH37 9.0 3.7 19.6 0.8 12.7 1.2 0.5 MH25 6.2 2.5 21.0 0.6 10.2 0.6 0.3 MH37 9.0 3.7 19.6 0.8 12.7 1.2 0.5 Construction Terminations Thin film material is sputtered on to high grade ceramic rods. Material Solder-coated copper wire. Construction Terminations Nickel plated steel caps are force fitted and the termination Thin film material is sputtered on to high grade ceramic rods. MaterialStrength Solder-coated The terminations copper wirsatisfy e. the requirements of wires are welded to the caps. The value is obtained by a Nickel plated steel caps are force fitted and the termination IEC 68.2.21. Strength The terminations satisfy the requirements of helical cut in the film and finally the resistor body is protected wires are welded to the caps. The value is obtained by a SolderabilityIEC 68.2.21.The terminations meet the requirements of by a cement protection applied so that the terminations helical cut in the film and finally the resistor body is protected IEC 115-1, Clause 4.17.3.2 remain completely clear. Solderability The terminations meet the requirements of by a cement protection applied so that the terminations IEC 115-1, Clause 4.17.3.2 remain completely clear. Solvent resistance Marking The body protection and marking are resistant to all normal 1% tolerance resistors are colour coded with 5 bands. Solvent resistance Marking industrial cleaning fluids suitable for printed boards. 2% and 5% tolerance have 4. Band IEC 62 colours are used. The body protection and marking are resistant to all normal 1% tolerance resistors are colour coded with 5 bands. industrial cleaning fluids suitable for printed boards. 2% and 5% tolerance have 4. Band IEC 62 colours are used. General Note Welwyn Components reserves the right to make changes in product specification without notice or liability. General Note A subsidiary of All information is subject to Welwyns own data and is considered accurate at time of going to print. General Note TT electronics reserves the right to make changes in product specification without notice or liability. TT electronics plc Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to TT electronics own data and is considered accurate at time of going to print. Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK All information is subject to Welwyns own data and is considered accurate at time of going to print. A subsidiary of www.bitechnologies.com www.irctt.com www.welwyn-tt.com Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue E 10.05 TT electronics plc Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK TT electronics plc Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue E 10.05 191 11. 11 191High Voltage High Voltage Metal Film Resistors Metal Film Resistors Welwyn Components High Voltage High Voltage MH Series Welwyn Components MH Series Metal Film Resistors Metal Film Resistors MH Series Welwyn Components MH Series Performance Data Performance Data Maximum Typical Maximum Typical Load at rated voltage : 1000 hrs at 70C R% 1.5 0.4 Performance Data Load at rated voltage : 1000 hrs at 70C R% 1.5 0.4 Derating from rated power at 70C Zero at 155C Derating from rated power at 70C Zero at 155C Maximum Typical Overload R% 1.0 0.25 Overload R% 1.0 0.25 Load at rated voltage : 1000 hrs at 70C R% 1.5 0.4 56 days at DHSS R% 1.5 0.2 56 days at DHSS R% 1.5 0.2 Derating from rated power at 70C Zero at 155C Climatic R% 1.5 0.2 Climatic R% 1.5 0.2 Overload R% 1.0 0.25 Climatic category 55/155/56 Climatic category 55/155/56 56 days at DHSS R% 1.5 0.2 Temperature rapid change R% 0.5 0.05 Temperature rapid change R% 0.5 0.05 Climatic R% 1.5 0.2 Resistance to solder heat R% 0.5 0.05 Resistance to solder heat R% 0.5 0.05 Climatic category 55/155/56 Vibration and bump R% 0.5 0.05 Vibration and bump R% 0.5 0.05 Temperature rapid change R% 0.5 0.05 Voltage proof volts 700 min Voltage proof volts 700 min Resistance to solder heat R% 0.5 0.05 Vibration and bump R% 0.5 0.05 Application Notes Application Notes To ensure reliable performance at high voltages care should Voltage proof volts 700 min To ensure reliable performance at high voltages care should be taken to avoid potential sources of ionic contamination be taken to avoid potential sources of ionic contamination contacting the resistor body, for example, flux applied by Application Notes contacting the resistor body, for example, flux applied by spraying, encapsulation materials or contaminants from the To ensure reliable performance at high voltages care should spraying, encapsulation materials or contaminants from the environment of use. be taken to avoid potential sources of ionic contamination environment of use. contacting the resistor body, for example, flux applied by Packaging spraying, encapsulation materials or contaminants from the Packaging All MH series resistors are supplied tape packed ready for environment of use. All MH series resistors are supplied tape packed ready for loading on automatic sequencing and insertion machines. loading on automatic sequencing and insertion machines. Packaging Component wires will not protrude beyond the outside edge All MH series resistors are supplied tape packed ready for Component wires will not protrude beyond the outside edge of the tape. loading on automatic sequencing and insertion machines. 6 52 6 of the tape. 6 52 6 Alternative packing available by request. Component wires will not protrude beyond the outside edge Alternative packing available by request. 5 of the tape. 5 6 6 52 Lead Formed Resistors can also be supplied. Standard options Lead Formed Resistors can also be supplied. Standard options of Lancet, Radial and Goal Post forming are shown in the Alternative packing available by request. of Lancet, Radial and Goal Post forming are shown in the Lead Form information sheet. 5 Lead Form information sheet. f f 1 2 Lead Formed Resistors can also be supplied. Standard options f f 1 2 of Lancet, Radial and Goal Post forming are shown in the Body Location f f 1.4 mm 1 2 Lead Form information sheet. Body Location f f 1.4 mm 1 2 f f 1 2 Ordering Procedure Body Location f f 1.4 mm 1 2 Ordering Procedure Example: MH25 at 4.7 megohms and 1% tolerance in ammo pack box of 5000 pieces Example: MH25 at 4.7 megohms and 1% tolerance in ammo pack box of 5000 pieces Ordering Procedure M H 2 5 4 M 7 F I M H 2 5 4 M 7 F I Example: MH25 at 4.7 megohms and 1% tolerance in ammo pack box of 5000 pieces Type Type M H 2 5 4 M 7 F I Value (use IEC62 code) Value (use IEC62 code) Type Tolerance (use IEC62 code) Tolerance (use IEC62 code) F 1% Value (use IEC62 code) F 1% G 2% G 2% J 5% Tolerance (use IEC62 code) J 5% F 1% Packing G 2% Packing MH25 5000/box J I 5% Ammo Standard MH25 5000/box MH37 2500/box I Ammo Standard MH37 2500/box Packing Welwyn ComponentsM LimitedH25 Bedlington,5000/bo Northumberlandx NE22 7AA, UK I Ammo Standard Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK T elephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue E 10.05 General Note MH37 2500/box Telephone: +44 (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue E 10.05 TT electronics reserves the right to make changes in product specification without notice or liability. 192 All information is subject to TT electronics own data and is considered accurate at time of going to print. 192 www.bitechnologies.com www.irctt.com www.welwyn-tt.com Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK T TT electr elephone: +44onics plc (0) 1670 822181 Facsimile: +44 (0) 1670 829465 Email: info welwyn-tt.com Website: www.welwyn-tt.com Issue E 10.05 11. 11 192