Butt Contact Pushbutton Switches SERIES 38BT and 38BH Sub-Miniature Horizontal PC Mount Features •Drop-In Replacement for Industry Standard •Sealed Plunger Option •Printed Circuit Board Mount •SPST and SPDT, Momentary Contact DIMENSIONS in inches (and millimeters) 38BT .215 (5,46) .125 (3,18) CL .249 (6,32) .162 (4,11) .320(8,13) .025 (0,64) .130 (3,30) CL PC Mounting .043(1,09) DIA.TYP. .200 (5,08) Pushbutton Switches .100(2,54) DIA. SPST .030 (0,76) TYP. 38BH .200 (5,08) C L DIM."A" .249 (6.32) .200 (5,08) .125 (3,18) .180(4,57) .165(4,19) DIA. .015(0,38)TYP. .200(5,08) .162 (4.11) C L .030 (0.76) TYP. .200 (5.08) .020 (0,51) TYP. .030(0,76)TYP. PC Mounting .320 (8.13) .025 (0.64) .200 (5.08) .130 (3.30) .180 .125 .100 (4.57) (3.18) (2.54) DIA. DIA. 1 .030 (0.76) TYP. .200 (5.08) .165 (4.19) .015 (0.38) TYP. SPDT .200 (5,08) 2 .020 (0.51) TYP. .043(1.09) DIA.TYP. .100 (2.54) TYP. 3 TERMINAL IDENTIFICATION .200 (5.08) .200 (5.08) Unless otherwise indicated, tolerances are ± .010 (0,25) SPECIFICATIONS Materials and Finishes Rating Criteria Operating Life: 80,000 make-and-break cycles at full load Contact Rating (resistive load): Gold Contacts: 0.4 VA maximum at 20 Vac or Vdc maximum Silver Contacts: 1.0 Amp maximum at 120 Vac or 28 Vdc Contact Resistance: Below 20 milliohms typical initial at 2-4 Vdc, 100 mA Insulation Resistance: 1000 megaohms min. Voltage Breakdown: 1000 Vrms minimum at sea level Operating Temperature: -30°C. to +85°C. Solderability: Per MIL-STD-202F, Method 208D, or EIA RS-186E Method 9 (1 hour steam aging) CIRCUITRY ORDERING INFORMATION SPST–N.O. SPSt n.O. N.C. TERM.1 COMM TERM.2 N.O. TERM.3 SPDT–N.O. Base and Cover: Thermoplastic (UL 94V-0) Plunger: Thermoplastic (UL 94V-0), (S versions include an internal o-ring seal) Terminals: Copper alloy, gold or silver plate (as specified) over nickel plate Spring: Plated Music Wire Contact System: Copper alloy, gold or silver plate (as specified) over nickel plate Switch Support: Brass, tin-plated 38BX-4-H-3-N Series: 38BT = SPST, Momentary, Thru Hole Series: 38BH = SPDT, Momentary, Thru Hole Dimension A: 0 = 0.020" 4 = 0.215" Seal: S = O-Ring Seal, N = No Seal Contact Material: 1 = Solder Dip over Gold 2 = Solder Dip over Silver 3 = Gold - RoHS Compliant 4 = Silver - RoHS Compliant Orientation: H = Horizontal to PCB Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-1040 • Fax: 708-354-2820 • www.grayhill.com