RMB, RMBS Vishay Sfernice Moulded Precision Wirewound Resistors Axial Leads FEATURES * 0.75 Watt to 3 Watt at 25C * NF C 83-210 * CECC 40201-005 * Low temperature coefficient * Low ohmic values * Excellent behavior against humidity * Electrical insulation * Mechanical strength * Accurate sizes High stability and low temperature coefficient are the main features of the precision wirewound resistors type RMB RMBS models just as maintenance parts. Their performances can be compared with those of the best film resistors but they have in addition a greater power rating. RMBS styles meet the more severe requirements of NF C 83-210 (all RMBS styles are approved) and characteristic U of MIL-R-26 E (approximate size of RW 70 and 79 resistors) specifications. The two models RMB and RMBS have a similar construction. RMBS are submitted, in addition to a process which further increases the stability. On request, non-inductive resistors are available under the reference RMB NI. DIMENSIONS in millimeters RMB, RMBS 25 min. A SERIES AND STYLE 25 min. OB OE A max. RMB 0.75 RMBS 0.5 7 10.2 16.2 O B max. 2.5 4 6.4 O E 0.1 0.6 0.6 0.8 Weight in g 0.3 0.7 1.5 RMB 1.5 RMBS 1 RMB 3 RMBS 2 TECHNICAL SPECIFICATIONS RMB 0.75 RMB 1.5 RMB 3 NF C 83-210 - - CECC 40201-005 - at 25C at 70C VISHAY SFERNICE SERIES AND STYLE Power Rating Ohmic Range in Relation to Tolerance RMBS 0.5 RMBS 1 RMBS 2 - RP1 RP2 RP3 - - A B C 0.75W 1.5W 3W 0.5W 1W 2W 0.6W 1.2W 2.4W 0.4W 0.8W 1.6W 5% E24 0.1 2k 0.1 6.81k 0.051 13k 0.1 2k 0.1 6.81k 0.015 13k 2% E48 0.1 2k 0.1 6.81k 0.08 12.3k 0.1 2k 0.1 6.81k 0.078 12.4k 1% E96 0.1 2k 0.1 6.81k 0.1 12.4k 0.1 2k 0.1 6.81k 0.1 12.4k 0.5% E96 0.4 2k 0.4 6.81k 0.4 0.3 2k 12.4k Please consult VISHAY SFERNICE 0.4 6.81k 0.3 12.4k 0.1% Qualified Ohmic Range NF C 83-210 Limiting Element Voltage - - - 1 174 1 590 1 1.3k not applicable 120V 200V not applicable 120V 200V Critical Resistance out of nominal ohmic range Undergoes European Quality Insurance System (CECC) www.vishay.com 44 For technical questions, contact sfer@vishay.com Document Number: 50010 Revision 19-Mar-02 RMB, RMBS Vishay Sfernice Moulded Precision Wirewound Axial Leads PERFORMANCE TESTS REQUIREMENTS MIL-R-26 E NF C 83-210 CONDITIONS Dielectric W/s Voltage 700VRMS (0.1% + 0.05) - Short Time Overload 5Pn at 25C/5s (0.2% + 0.05) 0.25% + 0.05 Climatic Sequence NF C 83-210 - 55C/+ 200C 5 cycles TYPICAL VALUES AND DRIFTS RMB RMBS (0.05% + 0.01) (0.05% + 0.01) (0.1% + 0.01) (0.05% + 0.01) - (0.1% + 0.01) 0.25% + 005 Insulation R >100M >104M (0.05% + 0.01) >104M NF C 83-210 56 days 95% R.H. - 0.25% + 0.05 (0.1% + 0.01) Insulation R > 100M >104M (0.05% + 0.01) >104M Thermal Shock Load at 100% P followed by cold temp. exposure at - 55C (0.2% + 0.05) - Vibration MIL-STD-202 Method 204 - Test D: 20g 10/2000Hz (0.2% + 0.05) 0.25% + 0.05 Load Life MIL-STD-202 Method 108 Pr 2000 h (0.5% + 0.05) 0.25% + 0.05 1000h at 25C MIL-STD-202 Method 106 (0.2% + 0.05) Insulation resistance >100M - 1000h at + 200C (0.5% + 0.05) 0.5% + 0.05 Insulation R > 1G 1% 0.3% MIL-STD-202 100g Method 205 Test C (0.1% + 0.05) 0.25% + 0.05 0.05% 0.05% Humidity (Steady State) Moisture Resistance High Temperature Shock (0.2% + 0.01) (0.1% + 0.01) (0.01% + 0.01) (0.01% + 0.01) (1% + 0.01) (0.15% + 0.01) (0.1% + 0.01) (0.05% 3 + 0.01) >10 M >103M TEMPERATURE COEFFICIENT IN THE RANGE - 55 + 200C REQUIREMENTS NF C 83-210 MIL-R-26E OHMIC RANGE TYPICAL VALUES SFERNICE 100ppm/C Rn < 1 50ppm/C 50ppm/C 1 Rn < 10 Rn 10 25ppm/C + 0 to - 20ppm/C STABILITY AND POWER RATING Stability changes slightly according to power rating and ambient temperature. This fact is specially important for users needing a life drift lower than the initial resistance tolerance. Typical drifts, after 2000h life test made under the 90'/30' conditions and at a 25C ambient temperature are: MODEL STYLE Pn 1/2 Pn RMBS 0.5 0.5 W 0.25 W Document Number: 50010 Revision 19-Mar-02 RMBS 1 1W 0.5 W RMBS 2 2W 1W R% R% 0.15% 0.075% MODEL STYLE P max. Pn 1/3 Pn RMB 0.75 1W 0.75 W 0.4 W For technical questions, contact sfer@vishay.com RMB 1.5 2W 1.5 W 0.75 W RMB 3 3.5 W 3W 1.5 W R% R% 1% 0.5% 0.3% www.vishay.com 45 RMB, RMBS Vishay Sfernice Moulded Precision Wirewound Axial Leads POWER RATING CHART 125 % RATED POWER 100 75 50 37 25 0 0 50 100 150 200 250 275 300 350 AMBIENT TEMPERATURE IN DEGREES CELSIUS TEMPERATURE RISE 0. 5 RM BS BS RM 0. 75 200 B 150 B BS 1 B 5 1. 2 RM 3 RM RM RM HOT SPOT TEMPERATURE IN C 250 100 50 0 0 1 2 3 RATED POWER IN WATTS MARKING SFERNICE trademark, model, style, CECC style (if applicable) nominal resistance (in ), tolerance (in %), manufacturing date. ORDERING INFORMATION RMB or RMBS 3 NI MODEL STYLE NON INDUCTIVE WINDING Optional www.vishay.com 46 10k 0.5% SPECIAL DESIGN OHMIC VALUE TOLERANCE Method N Optional Custom items are subject to extra-charge and min. order. Please see price list. For technical questions, contact sfer@vishay.com PACKAGING Optional Document Number: 50010 Revision 19-Mar-02 Legal Disclaimer Notice Vishay Notice Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Vishay for any damages resulting from such improper use or sale. Document Number: 91000 Revision: 08-Apr-05 www.vishay.com 1