SURFACE MOUNT CERMET TRIMMERS (3 TURNS) RoHS compliant ST-7 INTERNAL STRUCTURE !3 1 !2 8 9 !1 !0 3 4 7 6 5 2 Part name FEATURES RoHS compliant Fine adjustment is possible Automatic mounting is possible (Taping) Flow/reflow soldering is possible Sealed construction (Washable: Refer to page 698.) Material Flammability Polyphenylenesulphide UL94V-0 1 Rotor gear 2 Base element 3 Terminal pin 4 Resistive element RuO2 cermet 5 Electrode Ag-Pd cermet 6 Housing base 7 Wiper 8 Shaft 9 Housing !0 Shaft "O" ring !1 Base "O" ring !2 Clutch spring !3 Cover Ceramic Copper alloy, Sn-Cu-plated -- Polyphenylenesulphide UL94V-0 Multi metal alloy -- Polyphenylenesulphide UL94V-0 Silicone rubber UL94HB Stainless steel -- 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) BlankBulk in plastic bag AJ-hook BGull wing Please refer to the LIST OF PART NUMBERS when placing orders. ST-7 SURFACE MOUNT TRIMMERS LIST OF PART NUMBERS Adjustment position Form of packaging Shape of terminal Taping (reel) Plastic bag ST-7ETA ST-7EA B ( Gull wing ) ST-7ETB ST-7EB A ( J-hook Top adjustment <Nominal resistance values> Pieces in package ) 500 pcs./reel 50 100 200 500 1 k 2 k 5 k 10 k 20 k 50 k 100 k 200 k 500 k 1 M Fig. 1 The above part numbers are all available with the respective combination of <Nominal resistance values> (Fig. 1). Verify the above part numbers when placing orders. Taping specification is not sold separately and must be purchased in reel units. 50 pcs./pack ELECTRICAL CHARACTERISTICS MECHANICAL CHARACTERISTICS Nominal resistance range 50 ~ 1 M Mechanical turn 3 turns Resistance tolerance 20 % Operating torque 5 mN*m {51 gf*cm} maximum Mechanical stop Clutch action Power ratings 0.25 W (70 C) 0 W (125 C) Resistance law Maximum input voltage Maximum wiper current Effective electrical turn Linear law 5 N {0.51 kgf} minimum 245 3 C, 2 ~ 3 s 100 mA or power rating, whichever is smaller Shear (Adhesion) 5 N {0.51 kgf} 10 s 2.5 turns Substrate bending Width 90 mm, bend 3 mm, 5 s, 1 time C.R.V. 1 % or 3 , whichever is greater Insulation resistance Thrust to shaft Solderability 1 % or 2 , whichever is greater Temp. coefficient 100 cycles [ R/R (2 +3 %)] DC200 V or power rating, whichever is smaller End resistance Operating temp. range Rotational life - 55 ~ 125 C 50 : 250 10-6/C maximum 100 ~ 1 M : 100 10-6/C maximum 1000 M minimum (DC500 V) Dielectric strength AC600 V, 60 s Net weight Approx. 0.25 g Pull-off strength { }Reference only ENVIRONMENTAL CHARACTERISTICS Test item Thermal shock Humidity Shock Vibration Reflow profile for soldering heat evaluation Temperature () 250 200 150 100 50 150 Load life Test conditions Specifications - 65 ~ 125 C (0.5 h), 5 cycles [ R/R 2 %] [S.S. 1 %] - 10 ~ 65 C (80 ~ 98 %), 10 cycles, 240 h 981 m/s2, 6 ms 6 directions for 3 times each (Amplitude) 1.52 mm or (Acceleration) 196 m/s2, 10 ~ 2000 Hz, 3 directions, 12 times each 70 C, 0.25 W, 1000 h Low temp. operation - 55 C, 2 h Over 230 High temp. exposure 125 C, 250 h Pre Heating Zone Immersion seal 85 C, 60 s Soldering heat Flow : 260 3 C as the temperature in a pot of molten solder, immersion from head of term inal to backside of board, 5 ~ 6 s, two times maximum Reflow : Peak temperature 255 C (Please refer to the profile below.) Manual soldering350 10 C, 3 ~ 4 s Peak : 250 180 5 N {0.51 kgf} 10 s +5 0 90 30 s 30 10 s Heating time Soldering Zone [ R/R 2 %] [ R/R 1 %] [S.S. 1 %] [ R/R 3 %] [S.S. 1 %] [ R/R 2 %] [S.S. 2 %] [ R/R 3 %] [S.S. 2 %] No leaks (No continuous bubbles) [ R/R 1 %] Reflow : two times maximum R/RChange in total resistance S.S. Setting stability ST-7 SURFACE MOUNT TRIMMERS RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS MAXIMUM INPUT RATINGS ST-7EA 2 1 k 2 k 5 k 10 k 20 k 50 k 102 202 502 103 203 503 15.8 22.4 35.4 50.0 70.7 112 15.8 11.2 7.07 5.00 3.54 2.24 100 k 200 k 500 k 1 M 104 204 504 105 158 200 200 200 1.58 1.00 0.40 0.20 0 0 5.5 70.7 50.0 35.4 22.4 2 3.53 5.00 7.07 11.2 2 500 101 201 501 (Unit: mm) 2 3.5 50 100 200 500 ST-7EB 2 Maximum wiper current (mA) 2 Nominal resistance Resistance code Maximum input values ( ) voltage (V) 1.6 1.6 1.6 2.35 1.6 2.35 Note) The zero point is the center of mounting. OUTLINE DIMENSIONS Unless otherwise specified, tolerance : 0.3 (Unit : mm) ST-7EA Top adjustment 1 0.5 W x 1.8 L x 0.5 D 6.4 2 1 2.3 ST-7EB Top adjustment 0.5 W x 1.8 L x 0.5 D 2 3.4 1.5 1.2 1 7.8 t = 0.15 3 0.02 min. Resistance code & Production date code The ST-7 series has a different terminal arrange- ment from the ST-32 and ST-4 series. Pay attention to the location of terminals number 1 and 3. (Resistance decreases when the shaft is turned CCW.) 0.35 min. 6.1 1.5 Lead-free Identification mark 0.35 min. Resistance code & Production date code 6.4 2 - 0.8 0.02 min. t = 0.15 3 4.3 6.1 0 6.8 -0.5 1.5 Lead-free Identification mark CW rotation 1.2 3.4 1.5 2 2 - 0.8 2.3 3 ST-7 SURFACE MOUNT TRIMMERS PACKAGING SPECIFICATIONS <Taping packaging specifications> Taping version is packaged in 500 pcs. per reel. Orders will be accepted for units of 500 pcs., i.e., 500, 1000, 1500 pcs., etc. Taping version is boxed with one reel (500 pcs.). EMBOSSED TAPE DIMENSIONS Maximum number of consecutive missing pieces = 2 Leader length and reel dimension are shown in the diagrams below. REEL DIMENSIONS Conforms to JIS C 0806-3 In accordance with EIAJ ET-7200A (Unit: mm) ST-7TB Taping Filled Empty 17.41 End Head 40 mm min. 210.8 20.5 50 min. Empty 20 pitches min. Leader Direction of feed 130.2 400 mm min. 2542 Direction of feed 12 0.1 4 0.1 2 0.1 7.5 0.1 Installation example (ST-7EA) 5 <Bulk pack packaging specifications> Unit of bulk in a plastic bag is 50 pcs. per pack. Boxing of bulk in a plastic bag is performed with 200 pcs. per box. 0.4 0.1 Installation example (ST-7EB) 16 0.4 0.1 +0.1 0 7.5 0.1 2 0.1 16 4 0.1 1.5 +0.1 0 1.5 12 0.1 1.75 0.1 ST-7ETB 1.75 0.1 ST-7ETA 21.41 Direction of feed 5