SYM A B C D E DATE 1/31/97 4/29/02 10/03/02 7/8/04 10/12/05 1/12/06 REVISION RECORD Release Was FA2646 Add App Notes Add LVF & LVH Add Table 2 Add LF2 APPRV MJA MJA MJA MJA MJA MJA RESISTORS · CAPACITORS · COILS · DELAY LINES RCD Engineering Guide R-37 Mounting Guidelines for RCD Leaded Resistors and Inductors BD Y (mounting height off PCB) X Body Length (L) Body Length (L) Lead Dia (d) <0.200" <.022" .022 - .026 <.034" .034 - .042 .043 - .052 <.034" .034 - .042 .043 - .052 <.034" .034 - .042 .043 - .052 <.034" .034 - .042 .043 - .052 .200 - .449" .450 - .999" 1.00" - 1.499" 1.50" or longer X (Min.) GROUP A .033 .050 .065 .080 .100 .080 .100 .125 .100 .125 .150 .100 .125 .150 d (lead dia) Table 2 X (Min.) GROUP B .050 .075 .075 .125 .175 .100 .150 .200 .125 .175 .225 .150 .200 .250 X (Min.) GROUP C .033 .050 .065 .080 .100 .080 .100 .125 .100 .125 .150 .100 .125 .150 GROUP A: RCD Series BW, CF, CFZ, FP, FR, GP, GPS, HF, LPT, MF, MFA, P, PCN, PMF, RG, RH, ZJ Dimensions: inch Table 2. Recommend PCB Hole Diameter (unless indicated otherwise) Nominal Lead Dia .020 (24 awg) [0.5mm] .025 (22 awg) [.63mm] .028 (21 awg) [0.7mm] .032 (20 awg) [0.8mm] .036 (19 awg) [0.9mm] .040 (18 awg) [1mm] .051 (16 awg) [1.3mm] .064 (14 awg) [1.6mm] .081 (12 awg) [2mm] GROUP B: RCD Series AL, ATB, CA, CC, HM, LOR *, MA, P, PF, PTB, Q, SA, TF, UHV*, ULV Recommended PCB Hole Dia (before plating) .028 (drill #70) .035 (drill #65) .039 (drill #61) .042 (drill #58) .0465 (drill #56) .052 (drill #55) .0635 (drill #52) .076 (drill #48) .0935 (drill #42) Recommended PCB Hole Dia (after plating) .025 .032 .036 .039 .0435 .049 .0605 .073 .0905 GROUP C: RCD Series 100, 200, ATS, MG, PW, RMF, RSF Application Note #1 LOW RESISTANCE VALUES: Resistance values are generally measured at 3/8” from each end of body as an industry standard. The effect of lead resistance can be appreciable on low resistance values (<10 ohm) especially in tight tolerances. Consideration to mounting layout and power derating should be taken to achieve 3/8” in-circuit lead length. RCD can also offer resistors measured at customer-specified dimensions. Application Note #2 MOUNTING HEIGHT: Recommended minimum mounting height off PCB for Group A and B resistors is (W ACTUAL /WRATING ) x BD. Example: a resistor is rated 2W at 25ºC and is going to be used at 0.5W at 25ºC, the recommended PCB clearance is (0.5 / 2) x BD. If BD (body diameter) is 0.2” then the part should be positioned .25 x .2 = .05” or greater off the PCB. If in the same example, the ambient temperature around the resistor (due to room temp and heat influences from other components) is above 25ºC, then the wattage would need to be derated according to individual data sheet to determine the proper W RATING . Inductors can be mounted directly on PCB. Recommended minimum mounting height off PCB for Group C resistors is (W ACTUAL /WRATING ) x BD x 2. RCD Components Inc. 520 E. Industrial Pk Dr Title: Mounting Guidelines for RCD Axial Lead Resistors and Inductors Manchester, NH 03109 USA Tel: 603-669-0054 Fax: 603-669-5455 www.rcdcomponents.com RCD Dwg. R-37 P.1 of 2 Series LVF & LVH Recommended Forming Dimensions and Mounting Span Hole Dia: .039” on 2W and 3W, .049” 5W-25W (some customized models utilize heavier gauge lead wires to enable operation at higher amperage, mounting holes need to be sized accordingly). Lead Forming: form axial leads to dimension B and radial leads to dimension A. Apply stress relief to lead wires while forming to prevent damage to ceramic and/or internal connections. Illustration displays radial leads formed at 90º to body but in some instances, the radial leads may need to be bent at slight angle to account for variation in lead positioning/spacing. RCD Type LVF2S, LVH2S LVF2, LVH2 LVF3, LVH3 LVF5, LVH5 LVF7, LVH7 LVF10, LVH10 LVF15, LVH15 LVF20, LVH20 LVF C A B A .45 .50 .56 .56 1.00 1.38 1.38 2.00 D LVH Series LF Recommended Mounting Span Dimensions: inch LF2 .048 .040 .040 .048 0.700 0.900 RCD Components Inc. 520 E. Industrial Pk Dr Manchester, NH 03109 USA Tel: 603-669-0054 Fax: 603-669-5455 www.rcdcomponents.com Title: Mounting Guidelines for RCD Leaded Resistors and Inductors RCD Dwg. R-37 P.2 of 2 B .84 .95 1.18 1.18 1.72 2.36 2.36 2.95 C .325 .335 .405 .425 .425 .455 .500 .500 D .08 .08 .10 .10 .10 .10 .125 .125