Resistors Make Possible Low Cost Semi-Precision Power Wirewound Resistor Low Cost Semi-Precision Power Wirewound Resistor LAS Series 1 and 3 watts 0.1Series ohm to 18K ohms LAS band identification • 1 Color and 3 watts • 0.1 ohm to 18K ohms ±5%, ±3%, ±1%, ±.5% tolerance • Color band identification Resistance wire TCR ±20 ppm/°C • ±5%, ±3%, ±1%, ±.5% tolerance RoHS-compliant available • Resistance wire TCRversion ±20 ppm/°C �������������������������� �������������������������������� ������������������������������ ��������� ������� ���������� ������������ �������� ����������������� • RoHS-compliant version available All Pb-free parts comply with EU Directive 2011/65/EU (RoHS2) ���������������� ����������������� Electrical Data IRC Type Power Rating 275°C Max. Hot Spot Commercial Range (ohms) Non-Inductive Range (ohms) Available Resistance (ohms) 125°C 25°C Min. Max. Min. Max. 0.5%, 1% 3%, 5% LAS-1 1 2 0.1 7.5K 0.1 3.8K 1 - 7.5K 0.1 - 7.5K LAS-3 2 3 0.1 18K 0.2 7.5K 1 - 18K 0.1 - 18K Environmental Data Max ∆R Test Condition (@ 25°C) Load Life 1000 hours 1.0% Moisture Resistance 1.0% Temperature Cycle 0.5% Short Time Overload 0.5% Low Temperature Operation 0.5% Solder Heat 0.25% Shock 0.5% Vibration 0.5% LAS-3 Carbon Comp Replacement (contact factory) The LAS-3 is a three watt conformal coated precision wirewound resistor. The resistance wire is welded to the end caps and wound on alumina rod for good thermal conductivity. In circuit applications that utilize two watt carbon comp resistors the LAS-3 is an idead effective replacement. The LAS-3 5.6 ohm can be specifically designed to withstand 22 jooules of energy delivered by a 1000 volt 10 x 1000 usec wave shape pulse. LIGHTNING SURGE Special LAS-3 5.6 ohm to 100 ohm will meet Telecom GR-1089 lightning requirements. • • • • V = 1000 volts T1 = 10 usec rise T2 = 1000 usec to V2 10 ohm output impedance V V2 0 T2 T1 MICROSECONDS General Note IRC reserves the right to make changes in product specification without notice or liability. General Note All information is subject to IRC’s own data and is considered accurate at time of going to print. TT Electronics reserves the right to make changes in product specification without notice or liability. All information is Technologies subject to TT Electronics’ own dataSouth andStaples is considered accurate atTexas time78411 of going Wire and Film Division • 4222 Street • Corpus Christi USA to print. Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com A subsidiary of TT electronics plc www.ttelectronicsresistors.com LAS Series Issue October 2008 Sheet 1 of 3 © TT Electronics plc 07.14 Low Cost Semi-Precision Power Wirewound Resistor Low Cost Semi-Precision Power Wirewound Resistor Make Possible LAS Series Physical Data B E A D C Dimensions (Inches (mm)) IRC Type A ±0.032 B (max) C (max) D (Lead Diameter) E (Lead length Min) LAS-1 0.348 (8.84) 0.110 (2.80) 0.407 (10.34) 0.020 (0.53) 1.475 (37.5) LAS-3 0.491 (12.47) 0.149 (3.80) 0.550 (13.99) 0.032 (0.81) 1.35 (34.3) Hot Spot Temperature @ 25°C Hot Spot Temperature @ 125°C 275 250 Hot Spot Temperature (°C) Hot Spot Temperature (°C) 275 LAS3 200 LAS1 150 100 50 25 250 LAS1 200 175 150 125 0 40 80 120 160 200 Percent of 25°C Power Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com LAS3 225 0 20 40 60 80 100 Percent of 125°C Power Rating LAS Series Issue October 2008 Sheet 2 of 3 General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. www.ttelectronicsresistors.com © TT Electronics plc 07.14 Low Cost Semi-Precision Power Wirewound Resistor Low Cost Semi-Precision Power Wirewound Resistor Make Possible LAS Series Pulse-Handling Capability @ 25°C Power Derating Curve 200 Percent of 125°C Power Rating Energy (watts-second) 14 12 LAS3 10 8 6 LAS1 4 2 0 0.1 0.2 0.5 1 2 5 10 175 LAS1 150 LAS3 125 100 75 25 Resistance (ohms) 75 125 175 225 275 Ambient Temperature (°C) Ordering Data Sample Part No. LAS - 3 2001 J LF Type LAS Power 3 = 3 watts 1 = 1 watt Resistance Value Expressed in ohms (Standard EIA/MIL Values) Tolerance J = ±5%, H = ±3%, F = ±1%, D = ±0.5% Lead-Free Construction Wire and Film Technologies Division • 4222 South Staples Street • Corpus Christi Texas 78411 USA Telephone: 361 992 7900 • Facsimile: 361 992 3377 • Website: www.irctt.com LAS Series Issue October 2008 Sheet 3 of 3 General Note TT Electronics reserves the right to make changes in product specification without notice or liability. All information is subject to TT Electronics’ own data and is considered accurate at time of going to print. www.ttelectronicsresistors.com © TT Electronics plc 07.14