general note irc reserves the right to make changes in product speci?cation without notice or liability. all information is subject to ircs own data and is considered accurate at time of going to print. a subsidiary of tt electronics plc ? 4222 south staples street ? corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com high voltage metal film resistor mh series ? value up to 2m2 ? high stability metal ?lm ? high working voltage to 3.5kv electrical data irc type power rating @ 70c (watts) resistance range (ohms) limiting element voltage (volts dc or ac peak) tcr (ppm/c) isolation voltage (volts) resistance tolerance (%) standard values thermal impedance (c/watt) operating temperature range (c) MH25 0.25 100k - 2m2 1600 100 700 1, 2, 5 e24 & e96 preferred 140 -55 to 155 mh37 0.50 100k - 1m0 3500 112 performance maximum typical load at rated voltage: 1000 hrs at 70c 1.5 0.47 derating zero at 155c short time overload 1.0 0.25 dry heat: 16 hrs @ 155c 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 environmental data mh series issue october 2008 sheet 1 of 2
? 4222 south staples street ? corpus christi texas 78411 usa wire and film technologies division telephone: 361 992 7900 ? facsimile: 361 992 3377 ? website: www.irctt.com physical data l f d d construction thin ?lm material is sputtered onto high grade ceramic rods. nickel plated steel caps are force ?tted and the termination wires are welded to the caps. the value is obtained by a helical cut in the ?lm and ?nally the resistor body is protected by a cement protection applied so that the terminations remain completely clear. terminations material 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. 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. high voltage metal film resistor 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 mh series issue october 2008 sheet 2 of 2
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