270 Series - RF Parts Company
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Select 270 Type fixed resistors for applications requiring wattage ratings from 12 to 1000 watts. The 270 Type resistors are equipped with lug terminals suitable for soldering or sturdy bolt connection. When secure mounting is required, the hollow core of these resistors permit fastening with spring-type brackets, thru bolts or thru bolts with slottedsteel brackets. Suitable for rugged applications, the 270 Type resistors feature all-welded construction and durable lead free vitreous enamel coating. Mounting brackets not included with resistors. FEATURES • Terminals suitable for soldering or bolt connection. • High wattage applications. • Rugged lead free vitreous enamel coating. • Flame resistant coating. • All-welded construction. SPECIFICATIONS 270 Series Material Coating: Lead free vitreous enamel. Core: Tubular ceramic. Terminals: Solder coated radial lug. Derating: Linearly from 100% @ +25°C to 0% @ +350°C. Vitreous Enamel Power Resistors C D L Electrical Tolerance: ±5% 1 ohm and over (J) ±10% under 1 ohm (K) Power rating: Based on 25°C free air rating. Overload: 10 times rated wattage for 5 seconds. Temperature coefficient: 1 to 20 ohms: ±400 ppm/°C. Above 20 ohms: ±260 ppm/°C Dielectric withstanding voltage: 1000 VAC: 12 to 100 watt rating. 3000 VAC: 175 to 225 watt rating (Measured from terminal to mounting bracket) To calculate max. amps: use the formula =P/R. Series Wattage L12 L25 L50 L100 L175 L225 L500 L1000 12 25 50 100 175 225 500 1000 Dimensions (in. / mm) D C Diam. I. D. Core Ohms L Length 0.1-51K 0.15-100K 0.38-260K 0.23-101K 0.13-101K 0.16-129K 0.38-218K 0.69-392K 1.75 / 44.4 2.0 / 50.8 4.0 / 101.6 6.5 / 165.1 8.5 / 215.9 10.5 / 266.7 12.0 / 304.8 20.0 / 508.0 0.313 / 7.94 0.562 / 14.3 0.562 / 14.3 0.750 / 19.1 1.125 / 28.6 1.125 / 28.6 2.50 / 63.5 2.50 / 63.5 0.188 0.313 0.313 0.50 0.75 0.75 1.75 1.75 / 4.76 / 7.94 / 7.94 / 12.7 / 19.1 / 19.1 / 44.5 / 44.5 Voltage 565 625 1625 2845 3595 4595 4970 8900 Non-Inductive versions available from stock. Other sizes available. Consult factory. Also available in low cost Centohm coating. Consult Factory. Power limitations for high resistance values: When resistance exceeds the resistance values listed at right, derate the Power Rating by 25% to improve reliability: See page 25 for mounting hardware Power rating 12W 25W 50W 100W Resistance value 3,900Ω 12,000Ω 35,000Ω 75,000Ω No power derating necessary for ratings higher than 100 watts. STOCK PART NUMBERS FOR STANDARD RESISTANCE VALUES ✙ = Most popular stock values ✔ = Stock values ✜ = Non-stock values subject to minimum handling charge per item ✙ ✙ ✔ ✙ ✔ ✔ ✔ ✔ ✔ ✔ ✜ ✔ ✜ ✔ ✜ ✔ ✙ ✙ ✙ ✙ ✙ ✙ ✙ ✔ ✙ ✔ ✔ ✙ ✙ ✙ ✙ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✜ ✜ ✔ ✔ ✜ ✜ ✜ ✔ ✔ ✜ ✔ ✜ ✔ ✔ ✔ ✔ ✜ ✔ ✔ ✔ ✔ ✔ ✔ ✜ ✔ ✜ ✜ ✜ ✜ ✔ ✙ ✔ ✔ ✔ ✜ ✙ ✜ ✜ ✜ ✜ ✔ ✙ ✔ ✔ ✜ ✔ ✔ ✙ ✜ ✔ ✜ ✔ ✔ ✙ ✔ ✙ L1000J––– –––1000 ––– 1000 ✔ ✙ ✔ ✔ L500J––– ––– 500 L175J––– ––– 175 ✔ ✔ ✙ ✙ ✔ ✔ ✙ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✙ ✙ ✔ ✙ ✔ ✔ ✔ ✔ ✔ ✔ ✙ ✔ ✙ ✔ ✔ ✙ ✙ ✙ ✔ ✙ ✔ ✙ ✙ L225J––– ––– 225 ✙ ✙ ✙ ✙ ✙ 4,000 5,000 6,000 7,500 8,000 10,000 12,000 15,000 20,000 25,000 30,000 35,000 40,000 50,000 60,000 70,000 75,000 80,000 100,000 125,000 150,000 175,000 200,000 250,000 L100J––– ––– 100 ✙ ✔ ✔ ✔ ✙ ✙ L50J––– ––– 50 ✔ ✔ ✔ ✔ ✔ ✔ Part N o. No Prefix ➡ Suffix –––4K0 –––5K0 –––6K0 –––7K5 –––8K0 –––10K –––12K –––15K –––20K –––25K –––30K –––35K –––40K –––50K –––60K –––70K –––75K –––80K –––100K –––125K –––150K –––175K –––200K –––250K L25J––– ––– 25 ✙ ✙ ✔ ✔ ✙ ✙ Ohmic value L175J––– ––– 175 L225J––– ––– 225 ✙ ✔ ✔ ✔ ✙ ✙ L1000J––– –––1000 ––– 1000 L100J––– ––– 100 ✙ ✙ ✙ ✔ ✙ ✙ ✙ ✙ ✙ ✙ ✙ L500J––– ––– 500 L50J––– ––– 50 1 2 3 4 5 10 15 25 50 75 100 125 150 200 250 500 750 800 1,000 1,500 2,000 2,500 3,000 3,500 Part N o. No Prefix ➡ Suffix –––1R0 –––2R0 –––3R0 –––4R0 –––5R0 –––10R –––15R –––25R –––50R –––75R –––100 –––125 –––150 –––200 –––250 –––500 –––750 –––800 –––1K0 –––1K5 –––2K0 –––2K5 –––3K0 –––3K5 L25J––– ––– 25 12 Watt ✔ L12J470 ✔ L12J560 ✜ L12J680 ✜ L12J820 ✔ L12J1K0 ✔ L12J1K2 ✔ L12J1K5 ✜ L12J1K8 ✔ L12J2K2 ✔ L12J2K7 ✜ L12J3K3 ✜ L12J3K9 ✔ L12J4K7 ✜ L12J5K6 ✜ L12J6K8 ✜ L12J8K2 ✔ L12J10K ✜ L12J12K ✜ L12J15K ✔ L12J18K ✔ L12J22K ✜ L12J27K ✜ L12J33K ✜ L12J39K ✜ L12J47K ✔ L12J51K Wattage ➡ 12 Watt L12JKR51 L12J1R0 L12J1R5 L12J2R2 L12J3R3 L12J4R7 L12J6R8 L12J10R L12J12R L12J15R L12J18R L12J22R L12J27R L12J33R L12J39R L12J47R L12J56R L12J68R L12J82R L12J100 L12J120 L12J150 L12J180 L12J220 L12J270 L12J330 L12J390 ➡ ✔ ✔ ✜ ✜ ✔ ✔ ✜ ✔ ✔ ✙ ✜ ✔ ✔ ✔ ✜ ✔ ✜ ✔ ✔ ✔ ✜ ✔ ✔ ✜ ✔ ✔ ✔ Ohmic value 470 560 680 820 1000 1200 1500 1800 2200 2700 3300 3900 4700 5600 6800 8200 10000 12000 15000 18000 22000 27000 33000 39000 47000 51000 Ohmic value Wattage Ohmic value 0.51 1 1.5 2.2 3.3 4.7 6.8 10 12 15 18 22 27 33 39 47 56 68 82 100 120 150 180 220 270 330 390 ✔ Shaded values involve very fine resistance wire and should not be used in critical applications without burn-in and/or thermal cycling. Red outlined values supplied in Silicone-Ceramic coatings instead of vitreous enamel. Ohmite Manufacturing Company 3601 Howard St., Skokie, IL 60076 • Tel. 847-675-2600 • Fax 847-675-1505 • Website: www.ohmite.com • E-mail: ohmite@wwa.com 23
