250 Series ‘Thin’ Stackohm® Vitreous Enamel Power When limited space is a consideration, choose FeatureS Ohmite’s “thin” stackable 250 Type resistors. These • Small size-to-power ratio. oval-shaped ceramic-core resistors feature a low • Stackable profile to permit installation in spaces with height restrictions. They are also equipped with integral • Integral mounting bracket conducts heat to mounting brackets so they can be fastened to a mounting surface. chassis and stacked in locations with limited surface • Low profile for use in equipment where space is area. limited. When properly fastened, the mounting brackets • All-welded construction. add a heat sinking benefit resulting in a smaller size per watt. Durable 250 Type resistors are fully welded • RoHS compliant product available. Add “E” suffix to and coated with lead free vitreous enamel. part number to specify. SerieS SPeciFicatiONS Series Wattage Ohms Max. Voltage* F10 10 1.0-15K 187 F20 20 1.0-50K 815 F30 30 1.0-10K 281 F40 40 1.0-25K 655 F55 55 1.0-30K 1405 Adjustable versions and other sizes available; Consult Ohmite Also available in low cost Centohm or Silicone coating; Consult Ohmite. * Maximum Voltage is based on Ohm’s Law [V=√P*R] as limited by the resis- tance value of specified product characteriSticS Coating Lead free vitreous enamel Core Ceramic Terminals Tinned lug with hole. RoHS solder composition is 96% Sn, 3.5% Ag, 0.5% Cu Derating Linearly from 100% @ +25°C to 0% @ +350°C Tolerance ±5% (J) Power rating Based on mounting a single resistor on a metal surface measuring 10” (254mm) square by 0.04” (1.016mm) thick. Reduce rating by 15% when mounting on non-metallic surface Overload 10x rated wattage for 5 seconds if max. voltage is not exceeded Temperature 1 to 20Ω: ±400 ppm/°C coefficient Over 20Ω: ±260 ppm/°C Dielectric with- 500 VAC: 10 and 20 watt rating. 1000 VAC: 30, 40 and 55 watt rating (mea- standing voltage sured from lug to mounting bracket) Max. amps To calculate, use the formula √P/R 110 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

250 Series ‘Thin’ Stackohm® Vitreous Enamel Power dimeNSiONS (in. / mm) 0.125" 0.625" 3.175 mm 15.875 mm Series Wattage Length L Length A 0.031" Diam. 0.794 mm 0.063" m F10 10 0.750 / 19.050 1.000 / 25.400 0D.1ia2m5". 110.5W88 & m 2m0W 0.375"9.525 m 375"25 mm FF2300 2300 21..020500 // 5301..870500 22..301030 // 5580..785000 3.1705.1 m10m": L 0.9.5 FF4505 4505 23..050000 // 5808..890000 24..725500 // 1 0679..985500 2.776 mm A 0.125" * *Reference dimension only; varies according to resistance 3.175 mm value. 0.250" 0.375" Note: When resistors are stacked, use washers or spacers 6.350 mm 9.525 mm as required to insure clearance and improve power dissipa- tion. 0.188" 0.125" Diam. 4.763 mm m 3.175 mm 0.109" m 4.970D9.1 ima9m6m". 30W2,. 74706W m m& 55W 0.938"23.813 1.000"5.400 mm L 2 0.250" 6.350 mm A 0.250" * 6.350 mm 0.125" 3.175 mm 0.438" 11.113 mm mOuNtiNg In addition to the standard box bracket, stud type brackets Derating for stacked mounting are available for stacking the standard size resistors. Stud Stacked resistors should be derated to prevent excessive tem- type brackets are available in two heights: standard (SS, peratures due to proximity. Approximate ratings are given in 0.437”/11.113mm) and high (SSH, 0.531”/13.494mm). The the table. Percent of Single Unit Rating SSH stud is recommended when stacking the adjustable Type Miniature with 260, as it assures clearance for the adjustable lugs to pass No. of 0.094” (2.381 mm) eachother. Spacer washer No. 6027 (O.D. 0.219”/5.556mm, Resistors Std. or Inter. Miniature Spacer Washer I.D. 0.125”/3.175mm, thickness 0.094”/2.381mm) is recom- mended for use with the miniature adjustable and fixed resis- 2 70 70 75 tors to provide clearance, as explained above, or increased 3 60 60 69 wattage. See chart. 4 50 50 60 0.125" 0.625" 0.125" 0.188" 0.031" Diam. 3.175 mm 15.875 mm 0.094" Diam. 3.175 mm 0.125" Diam. 4.763 mm 0.794 mm 0.063" 2.381 mm 0.063" 3.175 mm 0.109" 1.588 mm 1.588 mm 2.776 mm B B B 0D.1ia2m5". W 0D.1ia9m6". 200.8.61338" mm 0D.1ia9m6". W 3.175 mm 4.979 mm 4.979 mm L L L 2.707.61 1m0m": A T Csiozree 4.7603.1 m88m" A T Csiozree 6.3500.2 m50m" A T Csiozree 0.125" 0.125" 0.250" 0.375" 3.175 mm 0.438" 3.175 mm 0.438" 6.350 mm 9.525 mm 11.113 mm 11.113 mm 0.188" 0.188" Brackets 4.763 mm 4.763 mm cemented 0.125" Diam. 0.125" Diam. in core 3.175 mm 0.109" 3.175 mm 0.109" 2.776 mm 2.776 mm B B Diam. 0.156" x0.313" 0.196" W 3.969 x 7.938 mm W 4.979 mm Slot L L 6.3500.2 m50m" A T Csiozree 4.7603.1 m88m" A T Csiozree 0.125" 3.175 mm 0.438" 0.531" 0.5" 11.113 mm13.494 mm 12.7 mm (SS) (SSH) (continued) 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com 111

250 Series ‘Thin’ Stackohm® Vitreous Enamel Power cOre aNd termiNal SelectiON For Made to Order Type 250 Stackohm Resistors Code Free Air Max. for Wattage Core Dimensions† Min. Practical Core Fig. Standard Rating* Length L Width W Thickness T Ohms Ohms Dia. No. Dimension A Dimension B Terminal Miniature 10 0.750” (19.050mm) 0.375” (9.525mm) 0.125” (3.175mm) 1 15,000 TA 1 1.000” (25.400mm) 0.375” (9.525mm) 51 15 1.000” (25.400mm) 0.375” (9.525mm) 0.125” (3.175mm) 1 25,000 TA 1 1.250” (31.750mm) 0.375” (9.525mm) 51 20 2.000” (50.800mm) 0.375” (9.525mm) 0.125” (3.175mm) 1 50,000 TA 1 2.313” (58.750mm) 0.375” (9.525mm) 51 12 0.688” (17.463mm) 0.594” (15.081mm) 0.234” (5.953mm) 1 20,000 TB ** 51 Intermediate 21 1.000” (25.400mm) 0.813” (20.638mm) 0.250” (6.350mm) 1 8,000 TD 2 1.313” (33.350mm) 0.594” (15.081mm) 51 25 1.500” (38.100mm) 0.813” (20.638mm) 0.250” (6.350mm) 1 15,000 TD 2 1.813” (46.050mm) 0.594” (15.081mm) 51 Standard 5 1.750” (44.450mm) 30 1.250” (31.750mm) 1.000” (25.400mm) 0.250” (6.350mm) 1 10,000 TE 0.938” (23.813mm) 57 3, 4 2.000” (50.800mm) 5 2.500” (63.500mm) 40 2.000” (50.800mm) 1.000” (25.400mm) 0.250” (6.350mm) 1 25,000 TE 0.938” (23.813mm) 57 3, 4 2.750” (69.850mm) 5 4.000” (1.1.600mm) 55 3.500” (88 .900mm) 1.000” (25 .400mm) 0.250” (6 .350mm) 1 30,000 TE 3, 4 4.250” (107.950mm) 0.938” (23 .813mm) 57 70 4.750” (120.650mm) 1.000” (25.400mm) 0.250” (6.350mm) 1 120,000‡ TE 5 5.250” (133.350mm) 0.938” (23.813mm) 57 3, 4 5.500” (139.700mm) 95 6.000” (15 2.400mm) 1.000” (25 .400mm) 0.250” (6 .350mm) 1 150,000‡ TE 3, 54 66..570500”” ((116751.,140500mmmm)) 0.938” (23.813mm) 57 *Based on mounting on steeel panel 10” (254mm) x 10” x 0.040” (1.016mm). ‡These sizes are Ohmicone (silicone-ceramic) coated–type 450-460. †Inside dimensions of core are: 0.250” (6.350mm) x 0.047” (1.191mm) for TA; 0.406” **User supplies brackets. (10.319mm) x 0.047” (1.191mm) for TB; 0.438” (11.113mm) x 0.063” (1.588mm) for TD; 0.672” (17.069mm) x 0.063” (1.588mm) for TE. OrderiNg iNFOrmatiON Series RoHS Compliant Made-to-order Parts See web- Terminal Type Tolerance RoHS site for See “Resistor Terminals for Tubular Cores” J= 5% Compliant Coating Wattage Tolerance Ohms custom Blank=Vitreous F= 1% 1R0 = 1Ω core info C=Centohm H= 3% 250 = 250Ω S=Silicone J = 5% 1K0 = 1,000Ω K= 10% 25K = 25,000Ω Series Wattage & Mounting Brackets Ohms 25K5 = 25,500Ω Vitreous enamel: Core Code (user supplies bracket for core TB) Example: 25 = 250 Fixed See “Core and B= Stacking box 1R00 = 1Ω 26 = 260 Adjustable Terminal Selection” S= Stacking stud, std. height 250R = 250Ω Silicone ceramic: H= Stacking stud high 1K00 = 1,000Ω 45 = 450 Fixed U= Unit type 25K0 = 25,000Ω 46 = 460 Adjustable 25K5 = 25,500Ω Standard Values Wattage Wattage Wattage value Part No. – 10 – 20 – 30 – 40 – 55 value Part No. – 10 – 20 – 30 – 40 – 55 value Part No. – 10 – 20 – 30 – 40 – 55 mic Prefix  J–– J–– J–– J–– J–– mic Prefix  J–– J–– J–– J–– J–– mic Prefix  J–– J–– J–– J–– J–– Oh Suffix  F10 F20 F30 F40 F55 Oh Suffix  F10 F20 F30 F40 F55 Oh Suffix  F10 F20 F30 F40 F55 1 –––1R0E      50 –––50RE     1,500 –––1K5E      = Standard values; 1.5 –––1R5E    75 –––75RE   2,000 –––2K0E    check availability at 2 –––2R0E      100 –––100E      2,500 –––2K5E      3 –––3R0E    150 –––150E  3,000 –––3K0E     www.ohmite.com 4 –––4R0E   200 –––200E     4,000 –––4K0E   5 –––5R0E      250 –––250E     5,000 –––5K0E  7.5 –––7R5E    300 –––300E  6,000 –––6K0E 10 –––10RE     400 –––400E    7,500 –––7K5E  15 –––15RE    500 –––500E      10,000 –––10KE   20 –––20RE  750 –––750E   15,000 –––15KE  25 –––25RE      800 –––800E  20,000 –––20KE  30 –––30RE  1,000 –––1K0E      25,000 –––25KE  40 –––40RE  1,250 –––1K25E   40,000 –––40KE  112 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • info@ohmite.com

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: O hmite: F10J75R F10J30R F40J400 F40J5R0 F55J500 F40J7R5 F20J35K F20J2R0 F20J250 F20J2K0 F20J2K5 F20J200 F55J5R0 F55J10K F55J15K F55J75R F10J4K0 F10J400 F10J600 F40J10R F10J15R F40J15K F40J10K F20J6K0 F55J7K5 F55J750 F10J750 F10J7R5 F40J20K F30J3K0 F30J3R0 F55J3K0 F30J1R0 F30J100 F30J1R5 F10J20R F20J5K0 F40J2R0 F40J200 F30J10K F30J10R F10J50R F55J4R0 F40J2K5 F55J400 F40J2K0 F40J250 F20J300 F30J400 F30J4K0 F55J7R5 F55J5K0 F20J7K5 F20J3K5 F20J3K0 F30J50R F30J15R F20J12K5 F20J40R F20J40K F20J25R F20J25K F20J20K F20J75R F55J50R F40J4K0 F55J2R0 F40J4R0 F40J25K F40J25R F20J4K0 F20J15R F20J10R F20J15K F20J10K F30J40R F30J7K5 F30J750 F55J1K5 F55J1K0 F20J1K25 F10J1K25 F55J40R F10J5R0 F10J5K0 F10J300 F10J3K0 F55J20K F55J25K F55J25R F10J1K75 F40J7K5 F10J40R F40J750 F20J30K F20J800 F55J4K0 F40J150 F40J1K0 F40J1K5