SMV-R003-1

P recision Resistor Type SMV Spec Sheet R431-1/2 Dec 97 technical data resistance range tolerances temperature coefficient ( R > 10 mOhm ) applicable temperature range load capacity internal thermal resistance (foil / terminals) dielectric withstanding voltage inductance (R = 10 mOhm) stability (nominal load at Tk = 80 °C) Remarks: - 1 mOhm - 1 Ohm 0.5 % / 1 % / 5 % < 30 ppm/K (20 °C to 60 °C) -55 °C to +140 °C 3W Rthi < 15 K/W 1000 V AC < 10 nH deviation < 0.5 % after 2000 h Standard resistance values according to E12 with the additional values of 2 and 5 Minimum quantity of other values on request Tolerance 1% for values from 3 mOhm Tolerance 0.5% for values from 10 mOhm Resistor type SMV is the low ohmic version of type SMR in four-terminal execution. The temperature coefficient therefore is very low over the complete range; the resistance value is likewise independent on the quality of the solder connection. A high load capacity is achieved with the bulk copper connections in conjunction with a good heat - conducting substrate for the resistor element inside, as well as a temperature resistant epoxy resin housing. The resistor is also well suitable for switched applications based on its low inductance. The type SMV is delivered on a 24 mm belt in accordance with EIA-481 for automated assembly. ∆R/R20 [%] 0.2 -40 -20 20 40 60 80 100 120 T [oC] -0.2 -0.4 Temperature dependence of the electrical resistance of ISA-PLAN resistors P / P Nom 1 0.75 stability: 0.5% reduced stability: 1% 0.5 0.25 0 20 40 60 80 100 120 140 terminal temperature TK / [oC] dimensions ( mm ) power derating curve Spec Sheet R431-2/2 Dec 97 Proposal for PCB-layout Tape & Reel information ordering example: SMV - R003 - 5 type SMV resistance value 3 mOhm tolerance 5% 24 mm carrier tape according to IEC 286-3 (EIA-481) parts/reel: 1500 pcs power [W] 10k 1k 100 1k 10 100 1 100k 10 0.1 1 0.01 0.1 0.001 0.01 1 µs 10 µs 100 µs 1 ms 10 ms 100 ms 1s 10 s 100 s pulse width Limits: dR/R0 after 1*106 pulse cycles : < 1% average pulsepower < 1/10 P0 ( Technical modifications reserved ) RHOPOINT COMPONENTS LTD Tel: +44/01883 717988, Fax: +44/01883 712938, Email: sales@rhopointcomponents.com Website: www.rhopointcomponents.com power [W] energy [J]