Features ■ ■ ■ Applications Thick film technology Fail safe Protection to ITU-T K.20 ■ ■ ■ ■ ■ ■ Analog Line Cards CPE (Customer Premises Equipment) DDS (Digital Data Systems) DLC (Digital Loop Carriers) T1/T3 Transmission Lines ISDN L23 Line Feed Resistors w/Resettable Ceramic PTC Product Characteristics Resistor Tolerance (R1 + R3) and (R2 + R4) 30 ohms .......................................................................±8.6 % 50 ohms .......................................................................±5.6 % 100 ohms .....................................................................±3.3 % Resistor Tolerance (R1 + R3) / (R2 + R4) 30 ohms ....................................................................1 ±2.5 % 50 ohms ....................................................................1 ±2.3 % 100 ohms ..................................................................1 ±2.2 % Rating .........................................................................300 V, 1.0 A Trip Time @ 1 A ............................................0.9 seconds @ 20 °C Trip Current .........................................................155 mA @ 25 °C Circuit Schematic R1 R2 R3 1 R4 Physical Characteristics Body Style ..........................................................Open Frame SIP Body Material...........................................................96% Alumina Lead Frame Material..................................Copper, solder coated Standard Parts Available Off the Shelf ..............30, 50, 100 ohms 8 9 Product Dimensions Environmental Characteristics TESTS PER MIL-STD-202 Humidity ..........................................................................103B Solderability.....................................................................208D Thermal Shock ................................................................107B Resistance to Solvents ......................................................215 Resistance to Solder Heat ..............................................210D Flammability ...................................................................UL 94V-0 IEC 695-2-2 Functional Characteristics ITU-T K.20 Lightning Surge ................................................................1 KV Power Induction........................................................600 Vrms Power Contact..........................................................230 Vrms UL 497A 6 4 2 MAX. SEATED HEIGHT 11.30 (0.445) 25.75 MAX. (1.010) 0.84 REF. (.033) 2.54 (.100) 2.54 (.100) TYP. 2 PLCS. 5.08 (.200) TYP. 3 PLCS. 3.81 MAX. THICKNESS (.150) DIMENSIONS: 3.175 + 0.64/-0.13 (.125 + .025/-.005) 0.51 ±0.25 THICK (.020 x .010) 0.81 DIA. HOLE (.032) MM (INCHES) How To Order L23 A100AA Model (L23 = LFR w/Resettable Ceramic PTC) Resistor Tolerance • A030AA = 30 ohms • A050AA = 50 ohms • A100AA = 100 ohms Custom values available; contact factory. Circuit Protection Division Asia-Pacific: Tel: +886-2 2562-4117 Fax: +886-2 2562-4116 Europe: Tel: +41-41 768 5555 Fax: +41-41 768 5510 The Americas: Tel: +1-951 781-5500 Fax: +1-951 781-5700 www.bourns.com Specifications are subject to change without notice. Customers should verify device performance in their specific applications. L23 Line Feed Resistors w/Resettable Ceramic PTC Trip Characteristics Typical Hold Current vs Temperature for PTC + Resistor Typical PTC + Resistor Time to Trip 300 250 10.00 Hold Current (mA) Time (Seconds) 100.00 1.00 0.10 0.01 0.3 0.5 0.8 1.0 1.3 1.5 1.8 2.0 2.3 2.5 200 150 100 50 2.8 3.0 3.3 Current (Amps) 0 -40 -20 0 20 40 Temperature (°C) REV. A 06/05 Specifications are subject to change without notice. Customers should verify device performance in their specific applications. 60 80 100