PAS als | TAIT AIM CTU eaters Description Features 308: Modular Style, Conductive Plastic a 309: Modular Style, Thick-Film Cermet FERECG The series 308 and 309 are high-performance, low cost potentiometers. They are also available with S.P.S.T. or S.P.D.T. rotary switch modules, S.P.S.T. momentary switch modules and/or potentiometer modules in multiple sections up to three sections. * Compact - 1/2 in. (12.7mm) miniature, modular size. * Cost-effective - Design simplicity through fewer component parts. -- * Robust - Horizontal or vertical mountings with support plates. Nickel-plated brass shaft and bushings Resistance Tolerance Resistance Range End Resistance Power Rating Effective Rotation Dynamic Noise in various diameters and lengths. Insert molded gold plated terminals for strength. * Precision Made - screen-printed conductive plastic and thick-film cermet elements. Stability - Series 308 - 40C to +120C; Series 309 - 40C to 150C operating temperature. Series 308 Electrica! Specifications 100Q to 5 Megohms, linear; 500Q to 2 Megohms, non-linear Linear, thru SOOKQ, +10%: above 500K to 5 Megohms, +20%. Non-linear thru 1OOKQ, 10%; above 1002 +20%. Linear, 49 maximum each end. Taper low side. 4Q maximum. High side 1% of total R. .5 watt @70C. Derated linearly to zero watts at 120C. See Chart B, page 29. For non linear tapered units or PC mounting, derate by 50%. Trimmer style, derate by 50%. 265 +5 without rotary switch; 240 +5 with rotary switch. Standard: Linear single controls maximum initial noise level of 1.5% of total resistance. Measurement made using constant current source and oscilloscope detection technique. Special: 1%. CLAROSTAT. Dover, NH 03820 1-800-872-0042 FAX 603-742-0481 re 309 Electrical Specifications Linear: SQ to 5 Megohms Taper: 100Q to 2 Megohms +10% standard: +5% special. Trimmers 20%. 2Q maximum. 5Q to 2500Q. 4Q maximum. 5KQ and above. 1 watt @ 85C. Derate linearly to zero watts at 150C. For tapered units, trimmers or PC mounting, derate 50%. 250 +10 -5 without rotary switch: 225 +10 -5 with rotary switch. Standard: Linear single controls maximum initial noise level of 3% of total resistance. Measurement made using constant current source and oscilloscope detection technique. Special: 1.5% Electrical Specifications continued, next pageElectrical Specifications continued from previous page Electrical Rotation Working Voltage Resistance Temperature Characteristics Linearity Non-linear Tapers Taper Tolerance Voltage Coefficient Dielectric Withstanding Voltage 295 45 350 Vdc across end terminals, but power not to exceed rating. See Chart C. +5% independent Right or left-hand available. See Chart A. 420% of nominal resistance @ 50% +3% of mechanical rotation. .008%/Volt maximum 750 Vac for 60 seconds @ ATM pressure. 350 Vac for 6 seconds @ 3.4 in. Hg. 295 +5 350 Vdc across end terminals, but power not to exceed rating. See Chart C. +5% independent Right or left-hand available. See Chart A. +20% of nominal resistance @ 50% +3% of mechanical rotation. .008%/Volt maximum 900 Vac for 60 seconds @ ATM pressure. 350 Vac for 60 seconds @ 3.4 in. He. Series 308/309 Mechanical Specifications Mechanical Rotation 295 +5 Push Momentary Switch S.P.S.T.. 125ma, 28Vde. push momentary switvh. Type DJ Stop Torque Rotary Switch 3 Ib. in. minimum (metal shaft) S.P.S.T. and S.P.D.T.. CCW or CW, 125ma. 28Vde. Other torque options available. Please consult factory = Type AL Torque Range .20 to 3.0 oz. in. (Single); .3 to 3.5 oz. in. (Dual): .4 to 4.5 oz. in. (Triple). Other torque options available. Please consult Factory. Center Detent Indent device which provide an indexing position. Indent torque: .6 to 3 oz. in. Rotational torque: .3 to 2.5 oz. in. Indent position: Single at 50% mechanical rotation Rotational life: 25,000 cycles Torque Variation Within control .5 oz. in. maximum Housing Thermoplastic polyester. blue. (U.L. SE-O rating). Bushing Material: Brass nickel plated Diameters: Supplied in .250" 32 NEF 2A thread (6.35mm) and .375" 32 NEF 2A thread (9.53mm). Lengths: Available in .250"(6.35mm),. 375(9.53mm), and .500"(12.7mm). Styles: Plain, locking and trimmer. Hardware Nut: brass. nickel-plated Lockwasher: phosphorous bronze. nickel-plated Solvent Resistance Housing resistant to trichlorethylene, *Chlorethene NU. Freon TMS, **Freon TMC. toulene, MEK, ethyl acetate and gasoline. For solvents not listed. please consult Shaft Factory. Note: Units not immersion sealed Material: Brass nickel plated and stainless steel Diameters: Single shaft:.125"(3.18mm) and .250"(6.35mm) Concentric: .078"/.125"(1.98/3.18mm) and .125"/.250"(3.18/6.35mm) Lengths: Maximum of 3"(76.2mm) from bushing mounting surface. .025"(.635mm) minimum on trimmer bushing Styles: Plain, slotted, flatted and concentric Terminals Gold-coated PC terminals or solder hook style. PC pins fit .100 grid spacing. Terminal mounting options available. Weight (approx.) Metal shaft & bushing: (Single) .19 0z.. (Dual) .27 0z.. (Triple) .35 oz. *T.M. Dow Chemical Co. **T.M. DuPont Mechanical Specifications continued, next column CLAROSTAT, Dover, NH 03820 1-800-872-0042 FAX 603-742-0481Series 308/309 Operational Specifications AL Switch Specifications Operating Temperature Range Series 308: -40C to +120C Series 309: -40C to +150C Storage Temperature Range Series 308: -55 to +120C Series 309: -55C to +150C Rotational Life Series 308: linear control, 50,000 cycles under load. (plain bushing). Change not to exceed 10% R. Trimmer life under load is 5,000 cycles. Series 309: linear control. 25,000 cycles under load. (plain bushing). Change not to exceed 5% R. Trimmer life under load is 5.000 cycles. Figurel ChartA 100 o> AN / % RESISTANCE $ Ln bh] . VA. I ZL ~ 10 V 4 |_] Pp 0 10 2 x cu oO n 80 0 100 % EFFECTIVE ROTATION CLOCKWISE Curves Standard The S" taper is linear, the change in resistance value being directly proportional to the degree of rouution. It can be used either as right- hand or left-hand taper. The Z" taper attains 10% resistance value at 50% of clockwise rotation (left-hand). The reverse "Z" taper attains 10@ resistance values at SO ot counter- clockwise rotation (nght-hand). For conformity and special output curves, consult Factory CLAROSTAT, Dover, NH 03820 1-800-872-0042 FAX 603-742-0481 Rating 125ma 28Vdc (dry circuit) Rotational Life 25,000 cycles under rated load DJ Switch Specifications Rating 125ma 28Vdc Rotational Life 25,000 under rated load Figure 2 Chart B POWER DERATING GRAPH RATED POWER IN PERCENT TEMPERTURE IN DEGREES CENTIGRADEFigure 3 Chart C Nominal | Maximum Percent Temporary Resistance Change From 25 , Resistance 55C -40C O. 25C 55C 48SC +10 100 Ohms =+5.0 = +4.0 thS 0 +15 2.00 +35 10k Ohms +7.0 | +5.5 +2.0 0 15 225 $5.5 100k Ohms +8.0 +6.0 42.5). 0 #20 0 #3. 5 ; +6. 0 - [Megohm +100: +80 +30 0 425 +40 475 For non-linear tapers, multiply chart values by 1.25. Figure 4 Series 308/309 Single, Dual or Triple (Second or Third Section May Be AL Series Rotary Switch) Printed Circuit - Type B-22 C Terminal Length: 875" (22.3mm) Maximum Standard PC Terminal Length: .250" (6.36mm) 1.090 +.015-et MOUNTING SURFACE (27.69mm1 [0.38mm) pe .790 +.015+ {20.07mm) {0.36mm ) BUSHING LENGTH -016 10.04mm Tolerance specifications apply to all layout drawings unless otherwise specified: fractions +1/64 in. (.379mm); +1/32 in. (.794mm) over I in. (25.4mm): decimals +.005 in. (127mm); PC board layout +.010 in. (.254mm). b> SHAFT LENGTH 4.037 [10.79mm ] 490 +.015 re- .031 10,79mm ) .031 [0.79mm 1 *.010 (0.25mm ] - .000 +.010 0.25mm ) -.000 .040 {1.02mm ) bo. -500 +.03) {12.70mm] {0.79mm) -080 +.005 lr 2.03mm} 10. 13m i far . , -016x45 y | | (04mm) i | CHAMFER t .500 ,031 i | T i (12. 70mm1 10, Ae i . .125 #.001 DIA. LOC. PIN i i 13.17MM 1 (0.02mm} NO. 1 r 7 1/4-32-NEF-2A tT 7 i 16.35mm) THREAD =) 13. 4Qmm] CO 4.015 | obs Loc. P i i [0.3mm ] [0.63mm | 025 -016 10.41mm] 100 (0.63mm | _ ke .200 (5.08mm } 12.54mm 1 be ,300 { 7.62mm] . 100 L 1300 17.62mm} SERIES 308-309 (2. 54mm} Figure 5 Figure 6 : : Series 308/309 Solder Lug Terminals Series 308/309 Bushingless Trimmer .530 +.016 (13.46mm1} (0.40mm } 025 10.63mm ) j a 484 ] (12.30mm ] | 547 200 .070 (1.78mm | (14.89mm } [5.08mm ] HOOK WILL ACCEPT 3 .NO.22 AWG WIRES 055 {1.40mm ) | MTG. SURFACE CLAROSTAT, Dover, NH 03820 1-800-872-0042 FAX 603-742-0481Figure 7 Series 308/309 Single, Dual, or Triple with Panel and Rear Support Plates, Horizontal Mounting fi 025 [ .063mm ) MAX, "A" -.015 : (0.38mm ) N "Cc" =.015 ~ | {0.38mm ) ] | . 100 .040 12.54mm 1] P.C. BOARD + .015 10. 38mm } (1.02mm } MTG. SURFACE -400 (10.16mm) SERIES 308-309 - P.C. TYPE B-24 - SINGLE, DUAL OR TRIPLE - _ PANEL AND REAR SUPPORT PLATES - HORIZONTAL MOUNTING .125 +.005 (3.1 7mm) (0.13mm} | | C D so Ar ce + TYPE PLATE TERMINAL re 4 1 B24A-1 .37519.52mm) 250 STD. 16.35mm) . } f +100 1 2,54mm} B24A-2. .500112.70mm) .37519.52mm ] | 4 4 | B24A-3 .625115.87mm) .500 1 12. 70mm} L A A L B24A-4 .750119.0S5mm)] .625115,87mm] i ~ Y .100 [2.54mm ] B24A-5 .25516.47mm) 1125 13.17mm) .160 1 4.06mm} B24A-6 .30017.62mm1 .175 1 4.44mm) -400 110. 16mm) 4 L.- 400 1 10.16mm] B24A-7 .437 0 11.10mm)] 315 18.00mm! _e be 450 1 11.43mm) B24A-B .562114.27mm) .425(10,79mm) L- 700 {17.78mm 14 NOT USED AS MTG. SURFACE, PROVIDES P.C BOARD LAYOUT STABILITY ONLY FOR P.C. BOARD MTG. Figure 8 Series 308/309 Single or Dual with Center Detent .900 +.01S-+ [23.37mm 1] | 0.38mm } .600 +.015 (15.24mm] 0. 38mm } .125 +.001 {3.2mm j [0.02mm ) 7 q ! wee C q 3 1/4-32 NEF-2A M.S {6.35mm } 6230 15.84mm ]+ 025 300 1 7.62mm ] - jf .035 10.89mm) 4400 10.63mm } be .260 [6.60mm 1} lk .790 [ 20.07mm |] = bhe- 560 [ 14.22mm } .059 DIA. ++ be .490 112.54mm} 11.50mm] TYP. .260 16.60mm )] -035 DIA.TYP. as 2 {0.89mm } +400 (10.16mm) .300 {7.62mm ] [2.S54mm} CLAROSTAT. Dover, NH 03820 * 1-800-872-0042 FAX 603-742-0481 200 (5.08mm j - 400 (10.16mm 1 SINGLE OR DUAL W/ -250 {6.35MM] DIA. BUSHING -125 03.12mm) DLA. SHAFT P/C OR SOLDER HOOK TERM. AVAILABLE OPTIONS AL ROTARY SWITCH DETENT AT CENTER VARIABLE LOCATING PINSFigure 9 : Series 308/309 Single or Dual with Center Detent -920 +.015 (23.37mm1 (0.38mm 1 h- .600#.015 M.S. {9.52mm } .230 (5,84mm ]+4 300 (3 .62mm | -035 10.89mm } l-- .260 16.60mm)} | 2 f~ .790 [20.07mm | = fhe .560 (14.22mm) .059 DIA. t~- .490 1 12.54mm } {1.50mm1 TYP. .260 (6.60mm ] .035 DIA.TYP. 10.89mm 1 -200 {5.08mm } - 100 (2.54mm ] Figure 10 Series 308/309 Single, Dual or Triple with High Rotational Torque 375-32 NEF-2A 100 -S4mm | {15.24mm 1 (0.38mm } -250 +.001 16.35mm) (0.02mm ] .025 (0.63mm | +200 (5.08mm } +400 {10.16mm } SINGLE OR DUAL W/ 375 (9.52mm} DIA. BUSHING . 400 1250 [6.35mm} DIA. SHAFT st hie P/C OR SOLDER HOOK TERM. (782mm | AVAILABLE OPTIONS AL ROTARY SWITCH DETENT AT CENTER VARIABLE LOCATING PINS 1.120 .015 {28.45mm] (0.38mm ) 800+ .015 -_+ {20.32mm1] (0.38mm ) > . 485.015 112.32mm) (0.38mm} 250 16.35mm ] fy M.S. (9.52mm | -230 15.84mm } -300 1 7.62mm) ~ 035 10.89mm 1] h~- . 160 [ 4.06mm ) P .990 1 25. 15mm | --_+ -760 119.30mm I+ -690 (17.53mm -059 DIA. Ty ke .390 19.90mm 1} {1.50mm) TYP. ! - 160 14.06mm ) -035 DIA.TYP. (0.89mm | 200 -100 {2.54mm } 3/8-32 NEF-2A t- . 460 111.68mm) fe) O 025 +100 {0.63mm } (2.54mm } 200 [5.08mm } - 400 (10.16mm 1 SINGLE OR DUAL w/ 6375 19.52mm) OLA. BUSHING 250 {6.35mm] OLA. SHAFT P/C OR SOLDER HOOK TERM. -400 TLON VARIABLE LOCATING PINS AVAILABLE OPTIONS (10. 16mm HIGH ROTATIONAL TOROUE - 300 (7.62mm J {5.08mm } CLAROSTAT. Dover. NH 03820 1-800-872-0042 FAX 603-742-0481Figure il Series 308/309 Dual Concentric .125 +.001 [3.17mm] (0.02mm ] DIA. -078 +.001 {1.98mm)] {0.02mm ) DIA. Figure 12 Series 308/309 Type C-10A Printed Circuit Terminals -109 10.1tmm] DIA. ON 2) = + - 400 bee - = ~125 13.1 7mm 1} (10.16mm ] .500 4 4 12. 70mm | [ .100 12.54mm} 4 t | .250 > 16. 35mm } .100 [2.54mm } .035 DIA ON 6) {0.89mm ] _.| K .300 [ 7.62mm} MP P.C.BOARD LAYOUT .300 [7.62mm ] 2100 (2.54mm ) | _.| LL .100 ~300 1 7.62mm } L 1 2.54mm | Figure 13 Series 308/309 Type A - 18A Printed Circuit Terminals . 300 {7.62mm } IN QW P.C.BOARD -156 (3.99mm ] CLAROSTAT, Dover, NH 03820 1-800-872-0042 FAX 603-742-0481 Lo toe (2.54mm ] .035 DIA. (ON 3) LAYOUT = (9, 89mm }Figure 14 Series 308/309 Type C - 8A Printed Circuit Terminals -109 DIA. 10N al {2.77mm ] fo> . 300 (7.62mm) | YW -500 112.70mm J | 250 [6.35mm } Oo 4 -100 [2.54mm ] L -100 [2,.54mm ) P.C.BOARD LAYOUT; 932,014. (ON 3) 025 10.63nm11 2125 13.17mm 1 MAX. -300 L_ {7.62mm ) Figure 15 Series 308/309 Type C - 9A Printed Circuit Terminals 300 1 7.62mm?) -300 1 7.62mm) T -500 +- | 142.70mm ] tL | 100 12.54mm i f 2025 10,63mm } MAX, [O.1imm! 125 13.1 7mm 1 300 7.62mm ] +300 1 7.62mm) -250 D 6.35mm 1 109 DIA. fON 2) P.C.BOARD LAYOUT + -035 DIA, 0,.89mm } +100 2.54mm } (ON 61 Series 308/309 Standard Resistance Values Series 308/309 How To Order Example: 0308-N-PPS-100-Z Stock Values (Ohms) 308N 100 1000 1OK LOOK Mee 250 2500 25K 250K bSMeg 500 5000 SOK S00K SMeg 308N - PC i 1600 10K 100K IMeg 250 2500 25K 250K 2.5Meg 500 5000 50K 500K 5Meg 308L. oe 500 OK OOK 1000 25K 250K 5000 SOK 500K 309N ; 100 10K 10K 100K IMeg 250 25K 25K 250K 2.5Meg 500 SOK SOK SO0K SMeg 3091 /D308/T308/D309/T309 Please consult factory for price and delivery. 7) [=] CLAROSTAT 4 1 Washington St., ld P.O. Box 1507 Bt Dover,NH 03820-1507 603-742-1120 FAX 603-742-0481 D Cad 08 | Series 308 = Single Conductive Plastic - 1/2 watt D308 = Dual Conductive Plastic - 1/2 watt T308 = Triple Conductive Plast - 1/2 wat 309 = Single Cennet-} wall D309 = Dual Cermet - | watt T3209 = Triple Cermet - } watt N $100k zZ oT Resistance Value (Ohms) Taper Z= Log RZ = Reverse Log S = Linear Switches S = Rotary switch S.P.D.T. PM = Push Momentan S.P.S.T. PPS = Push/pull switch .P.D.T. No switch requirement = Blank Shaft & Bushin. N= Shaft: /8 in. (3.18mm) diameter x 3/4 in. (19.05mm) FMS screwdriver slotted Bushing: 1/4 in. (6.35mm) diameter x 1/4 in. (6.35mn)) length Shaft: 1/8 in.(3.1 7mm) diameter \ 7/16in. (tl.dimm) FMS screw driver slotted Locking Bushing: 3/8 in.(9.52mm) x 1/4 in.(6.35mm) ~ 32-NEF 2A thread CLAROSTAT. Dover, NH 03820 1-800-872-0042 FAX 603-742-0481