RES-UM Datasheet, PDF (1/2 Pages) Ohmite Mfg. Co. – Special versions possible

Ultra-Mox Series
High Voltage, Thick Film
F e at u r e s
• High voltage resistors in thick film technology
• Radial leads, variable lead spacing by bending
• Climatic protection by silicone coating
• Special versions possible
• Resistance values up to 10 teraohm
• Low values of TCR and VCR
Series specifications
Series Power Rating Working Voltage Resistance Range
UM025 1.0
15KV



1M-100M
>100M-1G
>1G-100G
>100G-1T
UM030 1.0
10KV



1M-100M
>100M-1G
>1G-100G
>100G-1T
UM040 1.2
20KV



1M-100M
>100M-1G
>1G-100G
>100G-1T
UM050 3.0
30KV




1M-100M
>100M-1G
>1G-100G
>100G-1T
>1T-10T
Tolerance
0.25-10%
1-20%
5-30%
5-30%
0.25-10%
1-20%
5-30%
5-30%
0.25-10%
1-20%
5-30%
5-30%
0.25-10%
1-20%
5-30%
5-30%
10-30%
TCR
VCR
25, 50, 100
50, 100, 250
250, 500
500, 1000
1ppm/V
2ppm/V
10ppm/V
50ppm/V
25, 50, 100
50, 100, 250
250, 500
500, 1000
2ppm/V
5ppm/V
20ppm/V
100ppm/V
25, 50, 100
50, 100, 250
250, 500
500, 1000
1ppm/V
2ppm/V
10ppm/V
50ppm/V
25, 50, 100 1ppm/V
25, 50, 100 1ppm/V
100, 250 5ppm/V
250, 500 25ppm/V
on request
Closer tolerance, TCR and VCR, other dimensions, and voltage dividers, on request.
Characteristics
Continuous operating voltage V=√(P*R)
Measuring voltage Standard measuring voltage is 10V (50V for values >1G).
Different voltages on request.
TCR in ppm/K; Temperature range +25°C ... +125°C;
TCR25/50 and values above 1G: +25°C ... +85°C
Operating temp. range -55°C ... +125°C
Climatic category to EN 60068-1: 55/125/56
Humidity-/contact protection Lacquer coating. Resistant to most solvents. Isopropyl
alcohol recommended for cleaning; do not use acetone
or methylene choloride. Avoid mechanical stress to coat-
ing.
Stability: Storage (125°C/1000h) ≤10G: <1%; >10G: <2%
Stability at Max. voltage (Max. voltage/1000h) ≤10G: <1%; >10G: <2%
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