Carbon Composition Resistors Type CBT Series Key Features � Designed for Pulse Withstand � Range of Resistance Tolerances � Solid Carbon Composition � Low Cost, High Performance � Two Sizes Available � Wide Range of Resistance Values � Supplied Ammo Pack in boxes of 2000 The CBT series of resistors is constructed utilising solid carbon composition, which is the traditional medium for absorbing high energy pulses, in cases of high inrush current. These resistors have evolved over many years to have excellent pulse withstand capabilities, whilst remaining very stable. These improved characteristics have been achieved by prudent selection of materials of optimum physical properties and by advances in the manufacturing process. Characteristics - Electrical CBT25 CBT50 Power at 70°C Ambient: 0.25 Watts Derating to 0 at +125°C 0.5 Watts Derating to 0 at +125°C Maximum Voltage: 250 Volts 350 Volts Resistance Range: 1R0 - 5M6 1R0 - 22M Resistance Values: 5% E24 Series 10% E12 Series 20% E6 Series Voltage Coefficient: ± 0.035%/V ± 0.035%/V Limiting Element Voltage: 250 Volts 350 Volts Maximum Overload Voltage: 400 Volts 700 Volts Insulation Resistance: 1000 M minimum Characteristics - Environmental Operating Temperature Range: -55°C to +125°C Temperature Cycles: ΔR/R ± 2% (-55°C to +125°C, 5 cycles) Load Life (1000 hours at 70°C): ΔR/R ± 10% Resistance to Solder Heat: ΔR/R ± 3% (350°C for 3 seconds) Short Time Overload: ΔR/R ± 2% (2.5 x Rated Power for 5 seconds) Humidity (40°C, 95%RH, 240 hrs): ΔR/R ± 3% 1773192 CIS BI 12/2011 Dimensions are in millimeters Dimensions are shown for For email, phone or live chat, go to: te.com/help and inches unless otherwise reference purposes only. specified. Values in brackets Specifications subject are standard equivalents. to change. Carbon Composition Resistors Type CBT Series Dimensions Style L D l d CBT25 6.3 ± 0.7 2.4 ± 0.1 27 min. 0.6 CBT50 9.5±0.8 3.6±0.2 25 min. 0.7 Pulse Withstand Characteristics Charging and Discharging a 2000 pF Capacitor for 100 Cycles 10 10 0 0 a a b b -10 -10 c CBT25 c CBT50 a: 1.2MΩ a: 1.2MΩ -20 -20 b: 33kΩ b: 10kΩ c: 1kΩ c: 1kΩ -30 -30 0 2 4 6 8 10 12 14 0 2 4 6 8 10 12 14 Voltage (kv) Voltage (kv) How to Order CBT 25 J 10K Common Part Size Tolerance Resistance Value 1 ohm (1 ohm) 1R0 J - ±5% 25 - 0.25W 1K ohm Carbon Composition K - ±10% (1000 ohms) 1K Resistor 50 - 0.5W 100K ohm M - ±20% (100000 ohms) 100K 1M ohm (1000000 ohms) 1M TE Connectivity, TE connectivity (logo) and TE (logo) are trademarks. Other logos, product and Company names mentioned herein may be trademarks of their respective owners. While TE has made every reasonable effort to ensure the accuracy of the information in this datasheet, TE does not guarantee that it is error-free, nor does TE make any other representation, warranty or guarantee that the information is accurate, correct, reliable or current. TE reserves the right to make any adjustments to the information contained herein at any time without notice. TE expressly disclaims all implied warranties regarding the information contained herein, including, but not limited to, any implied warranties of merchantabili- ty or fitness for a particular purpose. The dimensions in this datasheet are for reference purposes only and are subject to change without notice. Specifications are subject to change without notice. Consult TE for the latest dimensions and design specifications. ΔR/R(%) ΔR/R(%)