High Voltage Metal Film Resistor MH Series • Value up to 2M2 • High stability metal film • High working voltage to 3.5kV Electrical Data IRC Type MH25 MH37 Power Rating @ 70°C (watts) Resistance Range (ohms) Limiting Element Voltage (volts dc or ac peak) 0.25 100K - 2M2 1600 0.50 100K - 1M0 TCR (ppm/°C) Isolation Voltage (volts) Resistance Tolerance (%) Standard Values 100 700 1, 2, 5 E24 & E96 Preferred 3500 Thermal Impedance (°C/watt) Operating Temperature Range (°C) 140 -55 to 155 112 Environmental Data Performance Load at Rated Voltage: 1000 hrs at 70°C Maximum Typical 1.5 0.47 Derating Zero at 155°C Short Time Overload 1.0 0.25 Dry Heat: 16 hrs @ 155°C 1.5 0.2 56 days DHSS 1.5 0.2 Climatic 1.5 0.2 Climatic Category 55/155/56 Temperature Rapid Change 0.5 0.05 Resistance to Solder heat 0.5 0.05 Vibration and Bump 0.5 0.05 Voltage Proof 700 min General Note IRC reserves the right to make changes in product specification without notice or liability. All information is subject to IRC’s own data and is considered accurate at time of going to print. Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com A subsidiary of TT electronics plc MH Series Issue October 2008 Sheet 1 of 2 High Voltage Metal Film Resistor Physical Data d D f L Dimensions (mm) & Weight (g) IRC Type L max D max f min d nom PCB Mounting Centers Min Bend Radius MH25 6.2 2.3 21.0 0.6 10.2 0.6 MH37 9.0 3.7 19.6 0.8 12.7 1.2 Construction Thin film material is sputtered onto high grade ceramic rods. Nickel plated steel caps are force fitted and the termination wires are welded to the caps. The value is obtained by a helical cut in the film and finally the resistor body is protected by a cement protection applied so that the terminations remain completely clear. Terminations Material Marking 1% tolerance resistors are color coded with 5 bands. 2% and 5% tolerance have 4. IEC 62 colors are used. Solvent Resistance The body protection and marking are resistant to all normal industrial cleaning solvents suitable for printed circuits. Solder-coated copper wire. Strength The terminations meet the requirements of IEC 68.21. Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2. Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com MH Series Issue October 2008 Sheet 2 of 2