electrical data m954 m987 m998 m959 m989 m999 power rating at 70c resistor watts 0.1 0.1 0.1 0.2 0.2 0.2 network 0.7 1.3 1.0 0.8 1.4 1.6 resistance ranges ohms 10r to 200k 10r to 400k standard resistance ratio and tolerance % 0.1, 0.25, 0.5, 1 (0.05 available) temperature coefficient ppm/c 15, 25, 50, 100, 300 tcr tracking ppm/c 5, except shematic b below 500 (20 ppm/c) ambient temperature range c -55 to +150 noise level db < -50 substrate material 99.5% pure alumina ceramic construction epoxy conformal coated, solder assembled ? welwyn components limited bedlington, northumberland ne22 7aa, england tel: 01670 822181 fax: 01670 829465 web: http://www.welwyn-tt.co.uk issue a 07/9 9 general note welwyn components reserves the right to make changes in product specification without notice or liability. all information is subject to welwyns own data and is considered accurate at time of going to print. tanfilm ? resistor network precision moulded dip m900 series c absolute tolerance to 0.05% c absolute tcr to 15 ppm/c c superior tcr tracking to 5 ppm/c c ratios available to 0.05% c custom circuit schematics available moulded tanfilm ? resistor networks are designed for use in applications requiring a high degree of reliability, stability, tight tolerance, close tcr tracking and low noise. the moulded construction provides excellent dimensional stability for automatic insertion. our continuous feed, high vacuum sputtering process ensures uniform properties from network to network. precise state-of-the-are laser trimming enables us to easily achieve in the tightest ratios. passivated tantalum nitride resistor film ensures performance far superior to military specifications and provides excellent environmental protection. the versatile nature of our photoetch process makes it possible to supply virtually any circuit configuration needed to meet special customer requirements. custom circuit designs can be easily achieved with a modest set up charge. military screening available on all units. custom circuits and special testing available. contact factory for any special features required. 72
additional ordering information model m959 4 resistor 8 pin dip straight thru schematic a m954 7 resistor 8 pin dip one common lead schematic b m989 7 resistor 14 pin dip straight thru schematic a m987 13 resistor 14 pin dip one common lead schematic b m999 8 resistor 16 pin dip straight thru schematic a m998 15 resistor 16 pin dip one common lead schematic b 0.180 +.0055/-.007 .035 .010 0.331 max. 0.310 .010 0.320 0.360 .010 .002 0.260 +.008/-.000 0.135 +.015/-.010 .065 +.005/-.003 .019 .002 0.100 .010 typ. nonaccumulative a physical data dimensions (inches) number variable of pins dimensions 8 0.465 14 0.765 16 0.865 tanfilm ? resistor network precision moulded dip m900 series ? welwyn components limited bedlington, northumberland ne22 7aa, england tel: 01670 822181 fax: 01670 829465 web: http://www.welwyn-tt.co.uk issue a 07/9 9 performance data test per mil-prf-83401 mil-prf-83401 limits tanfilm test data ( ? r%) ( ? r%) m k h maximum typical thermal shock and power conditioning 0.7 0.7 0.5 0.1 0.02 low temperature operation 0.5 0.25 0.1 0.1 0.02 short term overload 0.5 0.25 0.1 0.05 0.02 terminal strength 0.25 0.25 0.25 0.1 0.02 resistance to solder heat 0.25 0.25 0.1 0.1 0.02 moisture resistance 0.5 0.5 0.4 0.1 0.02 shock 0.25 0.25 0.25 0.1 0.02 vibration 0.25 0.25 0.25 0.1 0.02 life 2.0 0.5 0.5 0.1 0.02 high temperature exposure 1.0 0.5 0.2 0.1 0.02 low temperature storage 0.5 0.25 0.1 0.1 0.02 25c double load 2.0 0.5 0.5 0.05 0.02 schematics n = number of leads r1 n 123 a r1 n 123 b packaging resistor networks are supplied in anti-static tubes. 73
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