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High Voltage Metal Film Resistors
MH Series
Welwyn Components
* BSEN 60065 Approval for MH37
in value range 680K to 3M
* * * * *
High working voltage to 3.5KV Small size High pulse load capability Robust cement coating Value up to 10M
Electrical Data
MH25 Power rating at 70C max Resistance range Limiting element voltage Isolation voltage TCR Resistance tolerance Standard values Thermal impedance Ambient temperature range C/watt C 140 - 55 to 155 watts ohms volts dc or ac peak volts ppm/C % 0.25 100K - 10M 1,600 700 100 1, 2, 5 E24 and E96 preferred 112 MH37 0.5 100K - 3M 3,500
Physical Data
Dimensions (mm) and Weight (g) PCB mounting centres 10.2 12.7 Min Bend Radius 0.6 1.2
Type MH25 MH37
L max 6.2 9.0
D max 2.5 3.7
f min 21.0 19.6
d nom 0.6 0.8
Wt.nom 0.3 0.5
d
D
L
f
Construction
Thin film material is sputtered on to 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 Strength Solder-coated copper wire. The terminations satisfy the requirements of IEC 68.2.21.
Solderability The terminations meet the requirements of IEC 115-1, Clause 4.17.3.2
Marking
1% tolerance resistors are colour coded with 5 bands. 2% and 5% tolerance have 4. Band IEC 62 colours are used.
Solvent resistance
The body protection and marking are resistant to all normal industrial cleaning fluids suitable for printed boards.
General Note
Welwyn Components reserves the right to make changes in product specification without notice or liability. All information is subject to Welwyn's own data and is considered accurate at time of going to print. A subsidiary of TT electronics plc Issue E * 10.05
(c) Welwyn Components Limited * Bedlington, Northumberland NE22 7AA, UK
Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com
191
High Voltage Metal Film Resistors
MH Series
Welwyn Components
Performance Data
Maximum Load at rated voltage : 1000 hrs at 70C Derating from rated power at 70C Overload 56 days at DHSS Climatic Climatic category Temperature rapid change Resistance to solder heat Vibration and bump Voltage proof R% R% R% volts 0.5 0.5 0.5 700 min R% R% R% 1.0 1.5 1.5 55/155/56 0.05 0.05 0.05 R% 1.5 Zero at 155C 0.25 0.2 0.2 Typical 0.4
Application Notes
To ensure reliable performance at high voltages care should be taken to avoid potential sources of ionic contamination contacting the resistor body, for example, flux applied by spraying, encapsulation materials or contaminants from the environment of use.
Packaging
All MH series resistors are supplied tape packed ready for loading on automatic sequencing and insertion machines. Component wires will not protrude beyond the outside edge of the tape. Alternative packing available by request.
Standard Quantities Per Package
Type Ammo pack MH25 5000 MH37 2500
6
52
6 5
Lead Formed Resistors can also be supplied. Standard options of Lancet, Radial and Goal Post forming are shown in the Lead Form information sheet. f1 f2 Body Location f1 - f2 1.4 mm
Ordering Procedure
Specify type reference, value and tolerance as shown in this example of MH25 10MR 1%: Type Resistance value (IEC62 code) Tolerance (IEC62 code)
F G J 1% 2% 5%
MH25
10MO
F
(c) Welwyn Components Limited Bedlington, Northumberland NE22 7AA, UK Telephone: +44 (0) 1670 822181 * Facsimile: +44 (0) 1670 829465 * Email: info@welwyn-tt.com * Website: www.welwyn-tt.com 192
Issue E * 10.05

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