Thick Film High Voltage/ High Reliability MIL-Approved Metal Glaze™ Resistors Diamond spiraled thick film element CMH Series • • • • • Heat conducting ceramic substrate 1/4 watt to 5 watt TCR of ±100 ppm/°C Qualified to MIL-R-49462 330K ohm to 1G ohm range ±1%, ±2%, or ±5% tolerance Epoxy coated body High conductivity plated on nickel termination All welded cap and lead construction Tin Lead electroplated leads Electrical Data IRC Type MIL Type³ Power Rating @ 70°C (watts)¹ Voltage Rating (volts)² Resistance Range (ohms)4 CMH - 1/4 RHV30 1/4 750 330K - 100M CMH - 1/2 RHV31 1/2 1,500 330K - 392M CMH - 1 RHV32 1 3,000 330K - 499M CMH - 2 RHV33 2 5,000 330K - 499M CMH - 3 RHV34 3 10,000 330K - 1000M CMH - 5 RHV35 5 20,000 330K - 1000M Tolerance (±%) Maximum TCR (±ppm/°C)4 VCR (ppm/V) 1, 2, 5 100 0 to -5 Notes: 1. For power rating above 70C, see derating curve. 2. Voltage rating shown is the rated DC continuous working voltage or the sine-wave RMS absolute maximum voltage at commercial line frequency. 3. Marked per MIL-R-49462 4. Values greater than 100 meg and less than 500 meg, ±200ppm; values greater than or equal to 500 meg, ±500ppm. Environmental Data Maximum ∆R (±3σ) Typical ∆R Thermal Shock ±0.25% ±0.10% Solder Effect ±0.15% ±0.05% Terminal Strength ±0.20% ±0.10% Moisture Resistance ±0.50% ±0.20% Load Life (1000 Hours at 25°C) ±1.00% ±0.25% Shelf Life (1 year at 25°C) ±0.10% ±0.03% Low-Temperature Operation ±0.15% ±0.05% Shock ±0.35% ±0.10% Vibration ±0.35% ±0.10% Test Condition* Dielectric Strength Insulation Resistance at 500 VDC ±0.15% ±0.05% ±109Ω min 5 x 1012Ω typ Notes: *Test per MIL-R-49462 and MIL-STD-202 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 CMH Series Issue September 2008 Sheet 1 of 3 Thick Film High Voltage/ High Reliability MIL-Approved Metal Glaze™ Resistors IRC Advanced Film Division Physical Data 1.50 ± 0.125 (38.1 ± 3.2) BL 0.032 (0.81) DIA.* BD CL *CMH 1/4 leads are 0.025 (0.64) in diameter Dimensions (Inches and (mm)) Body Length - BL Body Diameter - BD Clean Lead to Clean Lead - CL CMH - 1/4 0.275 ± 0.031 (6.98 ± 0.79) 0.088 ± 0.010 (2.22 ± 0.25) 0.400 (10.16) CMH - 1/2 0.400 ± 0.031 (10.16 ± 0.79) 0.138 ± 0.016 (3.51 ± 0.41) 0.525 (13.34) CMH - 1 0.690 ± 0.062 (17.53 ± 1.57) 0.297 ± 0.031 (7.54 ± 0.79) 0.900 (22.86) CMH - 2 1.062 ± 0.062 (26.97 ± 1.57) 0.297 ± 0.031 (7.54 ± 0.79) 1.250 (31.75) CMH - 3 2.062 ± 0.062 (52.37 ± 1.57) 0.297 ± 0.031 (7.54 ± 0.79) 2.250 (57.15) CMH - 5 3.062 ± 0.062 (77.77 ± 1.57) 0.297 ± 0.031 (7.54 ± 0.79) 3.250 (82.55) IRC Type Temperature Rise Chart 100 100 90 90 80 80 % of Rated Power % of Rated Power Power Derating Curve 70 60 50 40 30 140 160 180 Ambient Temperature (°C) 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 CMH 1 40 30 10 120 CMH 5 50 20 100 CMH 1/2 60 10 80 CMH 2-3 70 20 0 CMH 1/4 0 0 10 20 30 40 50 60 70 80 90 Temperature Rise (°C) CMH Series Issue September 2008 Sheet 2 of 3 Thick Film High Voltage/ High Reliability MIL-Approved Metal Glaze™ Resistors IRC Advanced Film Division Ordering Data Sample Part No. CMH 3 - 100 - 2206 - F IRC Type CMH 1/4, CMH 1/2, CMH 1, CMH 2, CMH 3, CMH 5 Temperature Coefficient ±100 ppm/°C Resistance (≥100Ω - First 3 significant digits plus 4th digit multiplier) Example: 100Ω = 1000; 1000Ω = 1001, 150,000Ω = 1503 (>100Ω - "R" is used to designate decimal) Example: 51Ω = 51R0; 1Ω = 1R00; 0.25Ω = R250 Tolerance F = ±1% G = ±2% J = ±5% 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 CMH Series Issue September 2008 Sheet 3 of 3