ST-7 SURFACE MOUNT CERMET TRIMMERS (3 TURNS) ST-7 INTERNAL STRUCTURE RoHS compliant 3 1 2 8 9 1 0 3 4 7 5 2 6 Part name Material Flammability Rotor gear Polyphenylenesulphide UL94V-0 1 FEATURES Base element Ceramic 2 RoHS compliant Terminal pin Copper alloy, Sn-Cu-plated 3 Fine adjustment is possible Automatic mounting is possible (Taping) Resistive element RuO2 cermet 4 Flow/reflow soldering is possible Electrode Ag-Pd cermet Sealed construction (Washable: Refer to page 698.) 5 Housing base Polyphenylenesulphide UL94V-0 6 Wiper Multi metal alloy 7 Shaft 8 Polyphenylenesulphide UL94V-0 Housing 9 Shaft O ring 0 Silicone rubber UL94HB Base O ring 1 Clutch spring 2 Stainless steel Cover 3 PART NUMBER DESIGNATION S T - 7 E T A 1 k ( 1 0 2 ) Series name Resistance code Terminal pin Resistance value ESn-Cu (Lead-free) Form of packaging Product shape (Shape of terminal) TTaping (Reel) AJ-hook BlankBulk in plastic bag BGull wing Please refer to the LIST OF PART NUMBERS when placing orders.ST-7 SURFACE MOUNT TRIMMERS <Nominal resistance values> LIST OF PART NUMBERS 50 100 200 500 1 k 2 k 5 k Form of packaging Adjustment Shape of terminal position 10 k 20 k 50 k 100 k 200 k 500 k 1 M Taping (reel) Plastic bag Fig. 1 ( J-hook ) ST-7ETA ST-7EA A The above part numbers are all available with the respective combination of <Nominal resistance values> (Fig. 1). Top adjustment Verify the above part numbers when placing orders. ( Gull wing ) ST-7ETB ST-7EB B Taping specification is not sold separately and must be purchased in reel units. Pieces in package 500 pcs./reel 50 pcs./pack ELECTRICAL CHARACTERISTICS MECHANICAL CHARACTERISTICS Mechanical turn 3 turns Nominal resistance range 50 ~ 1 M Operating torque 5 mNm 51 gfcm maximum Resistance tolerance 20 % Mechanical stop Clutch action Power ratings 0.25 W (70 C) 0 W (125 C) Rotational life 100 cycles R/R (2 +3 %) Resistance law Linear law Thrust to shaft 5 N 0.51 kgf minimum Maximum input DC200 V or power rating, whichever is smaller voltage Solderability 245 3 C, 2 ~ 3 s Maximum wiper 100 mA or power rating, whichever is smaller Shear (Adhesion) 5 N 0.51 kgf 10 s current Effective electrical Substrate bending Width 90 mm, bend 3 mm, 5 s, 1 time 2.5 turns turn Pull-off strength 5 N 0.51 kgf 10 s End resistance 1 % or 2 , whichever is greater Reference only C.R.V. 1 % or 3 , whichever is greater Operating temp. 55 ~ 125 C range -6 ENVIRONMENTAL CHARACTERISTICS 50 : 250 10 /C maximum Temp. coefficient -6 100 ~ 1 M : 100 10 /C maximum Test item Test conditions Specifications Insulation resistance 1000 M minimum (DC500 V) R/R 2 % Thermal shock 65 ~ 125 C (0.5 h), 5 cycles S.S. 1 % Dielectric strength AC600 V, 60 s 10 ~ 65 C (80 ~ 98 %), Humidity R/R 2 % 10 cycles, 240 h 2 Net weight Approx. 0.25 g 981 m/s , 6 ms Shock 6 directions for 3 times each R/R 1 % (Amplitude) 1.52 mm or S.S. 1 % 2 Vibration (Acceleration) 196 m/s , 10 ~ 2000 Hz, 3 directions, 12 times each Reflow profile for soldering heat evaluation R/R 3 % Load life 70 C, 0.25 W, 1000 h S.S. 1 % R/R 2 % () Low temp. operation 55 C, 2 h +5 S.S. 2 % Peak : 250 0 250 R/R 3 % High temp. exposure 125 C, 250 h Over 230 S.S. 2 % No leaks 200 Pre Heating Zone Immersion seal 85 C, 60 s (No continuous bubbles) 180 150 150 90 30 s Flow : 260 3 C as the temperature in a pot of molten solder, immersion from head of 100 term inal to backside of board, 5 ~ 6 s, two 30 10 s Soldering heat times maximum R/R 1 % Reflow : Peak temperature 255 C 50 Soldering Zone (Please refer to the profile below.) Heating time Manual soldering350 10 C, 3 ~ 4 s Reflow : two times maximum R/RChange in total resistance S.S. Setting stability Temperature