SM-3/31 SURFACE MOUNT CERMET TRIMMERS RoHS compliant INTERNAL STRUCTURE 1 9 2 8 3 4 5 7 6 Part name Material Flammability ■ FEATURES 1 Housing Polyphenylenesulphide UL94V-0 ● RoHS compliant 2 Base element Ceramic ● Fine adjustment is possible ● Automatic mounting is possible (Taping) 3 Electrode Ag-Pd cermet ● Reflow soldering is possible ● Sealed construction (Washable: Refer to page 698.) 4 Resistive element RuO2 cermet — 5 Adhesive Epoxy 6 Wiper Multi metal alloy 7 Terminal pin Copper alloy, Sn-Cu-plated 8 Rotor gear Polyamide UL94V-0 9 Shaft Brass, Nickel-plated — ■ PART NUMBER DESIGNATION S M - 3 □ T W 1 k Ω ( 1 0 2 ) Series name Resistance code Electrical turn Resistance value Blank：11 turns 1：5 turns Product shape (Shape of terminal) Form of packaging A, W：J-hook T：Taping (Reel) B：Gull wing Blank：Bulk in plastic bag ※Please refer to the LIST OF PART NUMBERS when placing orders.

SM-3/31 SURFACE MOUNT TRIMMERS ■ LIST OF PART NUMBERS 〈Nominal resistance values〉 Adjustment Form of packaging 50 Ω 100 Ω 200 Ω 500 Ω 1 kΩ 2 kΩ 5 kΩ 10 kΩ Electrical turns Shape of terminal position Taping (reel) Plastic bag 20 kΩ 50 kΩ 100 kΩ 200 kΩ 500 kΩ 1 MΩ 2 MΩ Fig. 1 Top adjustment W (J-hook) SM-3TW SM-3W 11 A (J-hook) SM-3TA SM-3A Side adjustment B (Gull wing) SM-3TB SM-3B Top adjustment W (J-hook) SM-31TW SM-31W 5 A (J-hook) SM-31TA SM-31A Side adjustment ※ The above part numbers are all available with the respective combination B (Gull wing) SM-31TB SM-31B of <Nominal resistance values> (Fig. 1). ※ Verify the above part numbers when placing orders. Pieces in package 500 pcs./reel 50 pcs./pack ※ Taping specification is not sold separately and must be purchased in reel units. ■ ELECTRICAL CHARACTERISTICS ■ MECHANICAL CHARACTERISTICS Nominal resistance range 50 Ω ~ 2 MΩ Operating torque 5 mN·m {51 gf·cm} maximum Resistance tolerance ± 20 % Mechanical stop Clutch action Power ratings 0.125 W (70 °C) 0 W (150 °C) Rotational life 200 cycles [ΔR/R ≦ ± (2 Ω +3 %)] Resistance law （B） Thrust to shaft 5 N {0.51 kgf} minimum Linear law Maximum input voltage DC200 V or power rating, whichever is smaller Solderability 245 ± 3 °C, 2 ~ 3 s Maximum wiper current 100 mA or power rating, whichever is smaller Shear (Adhesion) 5 N {0.51 kgf} 10 s Effective electrical turn 11 turns (SM-3) / 5 turns (SM-31) Substrate bending Width 90 mm, bend 3 mm, 5 s, 1 time End resistance 1 % or 3 Ω, whichever is greater Pull-off strength 5 N {0.51 kgf} 10 s C.R.V. 3 % or 3 Ω, whichever is greater { }：Reference only Operating temp. range −65 ~ 150 °C Temp. coefficient ±100 10-6/°C maximum ■ ENVIRONMENTAL CHARACTERISTICS Insulation resistance 100 MΩ minimum (DC500 V) Test item Test conditions Specifications Dielectric strength AC600 V, 60 s [ΔR/R ≦ 2 %] Thermal shock−65 ~ 150 °C (0.5 h), 5 cycles [S.S. ≦ 2 %] Net weight Approx. 0.10 g Humidity −10 ~ 65 °C (80 ~ 98 %), [ΔR/R ≦ 3 %] 10 cycles, 240 h 981 m/s2, 6 ms Shock 6 directions for 3 times each 〈Reflow profile for soldering heat evaluation〉 [ΔR/R ≦ 1 %] (Amplitude) 1.52 mm or [S.S. ≦ 1 %] Vibration (Acceleration) 196 m/s2, (℃) 10 ~ 2000 Hz, 3 directions, 12 times each 250 Peak : 250+ 50℃ [ΔR/R ≦ 3 %] Load life 70 °C, 0.125 W, 1000 h Over 230 ℃ [S.S. ≦ 2 %] [ΔR/R ≦ 2 %] e 200 Pre Heating Zone Low temp. operation −65 °C, 2 h [S.S. ≦ 2 %] atur 180 ℃ High temp. exposure 150 °C, 250 h [ΔR/R ≦ 3 %] er 150 150 ℃ [S.S. ≦ 2 %] p Tem 90 ± 30 s Immersion seal 85 °C, 60 s (No conNtinou leoaukss bubbles) 100 30 ± 10 s Reflow : Peak temperature 255 °C 50 Soldering Zone Soldering heat (Please refer to the profile below.) [ΔR/R ≦ 1 %] Heating time Manual soldering：350 ± 10 °C, 3 ~ 4 s Reflow : two times maximum ΔR/R：Change in total resistance S.S. ：Setting stability

SM-3/31 SURFACE MOUNT TRIMMERS ■ MAXIMUM INPUT RATINGS Nominal resistance values (Ω) Resistance code Maximum input voltage (V) Maximum wiper current (mA) 50 500 2.50 50.0 100 101 3.53 35.4 200 201 5.00 25.0 500 501 7.91 15.8 1 k 102 11.2 11.2 2 k 202 15.8 7.91 5 k 502 25.0 5.00 10 k 103 35.4 3.54 20 k 203 50.0 2.50 50 k 503 79.1 1.58 100 k 104 112 1.12 200 k 204 158 0.79 500 k 504 200 0.40 1 M 105 200 0.20 2 M 205 200 0.10 ■ RECOMMENDED P.C.B. PAD OUTLINE DIMENSIONS ● SM-3W/31W ● SM-3A/31A ● SM-3B/31B (Unit : mm) 1.3 1.3 1.3 1.3 6 2 1. 6 1. 3 1. 2 3.1 0 2.43 0 4 0 4.4 0 6 6 1. 1. 6 1. 0.9 0.9 2 2.8 2.8 0.9 2.8 0.9 ※Also available to place as the 2.8 above. Note) The zero point is the center of mounting. ■ OUTLINE DIMENSIONS Unless otherwise specified, tolerance : ± 0.3 (Unit : mm) ● SM-3W/31W Top adjustment 1 3 CW rotation 2 Resistance code & Production date code 1 0.8 ※Note the terminal position. 2 2.8 6 1 3.9 0. 0.8 2.3 3.9 3 3.2 4.2 ΔR/R：Change in total resistance 3.5 0.4W × 1.3L × 0.3D S.S. ：Setting stability

SM-3/31 SURFACE MOUNT TRIMMERS ■ OUTLINE DIMENSIONS Unless otherwise specified, tolerance : ± 0.3 (Unit : mm) ● SM-3A/31A ● SM-3B/31B Side adjustment Side adjustment 1 3 CW rotation Resistance code & Resistance code & Production date code 2 Production date code ※Note the terminal position. 5 5 2. 2. 0.4W × 1.3L × 0.3D 0.4W × 1.3L × 0.3D 3.9 3.4 3.9 3.4 1 2 3 – 0.8 1 2 8 0. – 4.4 3.9 3 5.3 3.9 2 – 0.6 3 1 2 – 0.6 2.8 3 1 2.8 ■ PACKAGING SPECIFICATIONS <Taping packaging specifications> ● Taping version is packaged in 500 pcs. per reel. Maximum number of consecutive missing pieces = 2 Orders will be accepted for units of 500 pcs., i.e., 500, Leader length and reel dimension are shown in the dia- 1000, 1500 pcs., etc. grams below. ● Taping version is boxed with one reel. ● EMBOSSED TAPE DIMENSIONS ● REEL DIMENSIONS （Conforms to JIS C 0806-3） （In accordance with EIAJ ET-7200A） (Unit: mm) Empty Filled Empty 13+ 10 End Head 21±0.8 40 mm miDn.irection of feed 20 pitches minL.eader 2±0.5 +160 0 400 mm min. 13±0.2 180 – 01.5 15.4±1

SM-3/31 SURFACE MOUNT TRIMMERS ● SM-3TW/31TW 4 ± 0.1 2 ± 0.05 0.1 ± 0.4 ± 0.1 φ1.5 0+0.1 A 3 1.75 I(nSsMta-l3laWtio)n example 5 0 0. ± 5.5 +0.3–0.1 2 1 2 A 1 8 ± 0.1 4.7 Cross section A-A ● SM-3TA/31TA 1 4 ± 0.1 0. ± 0.4 ± 0.1 φ1.5 0+0.1 2 ± 0.05A 3 1.75 (InSsMta-l3laAt)ion example 1 5 0 0. ± 5.5 +0.32–0.1 1 A 2 8 ± 0.1 3.9 Cross section A-A ● SM-3TB/31TB 1 4 ± 0.1 0. ± 0.4 ± 0.1 φ1.5 0+0.1 2 ± 0.05A 3 1.75 (InSsMta-l3laBt)ion example 1 5 0 0. ± 5.5 +0.32–0.1 1 A 3.9 Cross section A-A 2 8 ± 0.1 <Bulk pack 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.