TOKEN LRA Low Ohmic Open Air Resistors Low Ohmic Open Air Resistors Low Ohmic Open Air (LRA) Resistors Feature Longer Thermal Path Preview Token’s current sense LRA open air resistors are expected to gain wide acceptance in the worldwide market as a result of increased thermal management capabilities. The LRA Series is designed for applications requiring the transfer of heat away from circuits and solder joints. Available in 0.5W, 1W, and 1.5W rating, the resistor is being specified for current sensing, feedback, current detective, supper low inductance, as well as surge and pulse applications. The hot spot on the LRA resistor is approximately 0.2 degrees higher than on a typical metal strip chip resistor. This results in an increased thermal path for the LRA, reducing heat transfer into the solder joints and circuits. The flameproof LRA Series resistors are constructed of a wire resistive element with welded copper leads to prevent solder wicking, which can change the device’s resistance value in the circuit by as much as 30%. Because of this, the device is ideal for thermally harsh environments, including automotive and aerospace applications, as well as enclosed, poorly ventilated circuits in applications such as laptop computers. The LRA Open Air Series feature a reduced pitch, or spacing between the leads on the circuit board (with a corresponding increase in the board mounted profile), when compared to the standard Token LRB Series devices. The LRA resistors are rated for 1W or 1.5W at 70°C, with resistance values from 0.1Ω to 0.003Ω and tolerances down to ±1%. Operating temperature range is -50°C to 300°C. The LRA Series is available in bulk packaging in 200 increments. Token will also produce devices outside these specifications to meet customer requirements. A lead-free RoHScompliant version is available, as is a non-inductive version for high frequency applications. Contact us with your specific needs. Features Applications - Radial leads. - Non-inductance. - Solderable Copper Leads. - Lead (Pb)-free and RoHS compliant. - ±1%, ±3%, ±5%, ±10% standard tolerance. - High stability bare metal element open air style. Version 2010 http://www.token.com.tw/ - High power AC/DC detection. - Automotive, Feedback System. - Residual Battery Power Detection. - Inverter and Switching Power Supplies - CPU Drive Control, Power Tool Motor controls. - Power Supply Shunt, Current Detective, and Current Sensing. rfq token.com.tw 01 of 03 TOKEN LRA Low Ohmic Open Air Resistors Dimensions (Unit: mm) Marking +0.5 M M RM Φ0.8 Measuring Point Type LRA350-009 LRA351-009 LRA352-009 LRA351-010 LRA352-010 LRA352-010 LRA352-010 LRA352-011 3.5+1 Hmax 3 -1.5 0 10 H max. 6.5 10.5 17.0 8.0 14.5 16.1±1.0 17.1±1.0 12.0 RM 10 15 14.5±1.0 14.5±1.0 20 Construction: 1. The resistive elements consist of a flat metal-band. 2. Spot welded Cu-terminals ensure high stability of contacts. 3. Thus, this construction results in a non inductive of both high stability and overload capacity. Packing Specification Type LRA350-009 LRA351-009 LRA351-010 LRA352-010 LRA352-011 02 of 03 Packaging Bulk Pieces 200pcs Pack.-Code Bulk Bulk 200pcs Bulk Bulk 200pcs Bulk http://www.token.com.tw/ rfq token.com.tw Version 2010 TOKEN LRA Low Ohmic Open Air Resistors Characteristic Specification Type 351-009 351-010 LRA 350-009 W Ω 0.5 R003~R051 352-009 352-010 352-011 1.5 R006~R10 Power rating P70 Resistance range E-series Tolerances Temperature coefficient Max. Cont. working voltage % PPM VRMS 1.0 R004~R068 E24≥R010 ±1, ±3, ±5, ±10 +200~+1200 √ P70 * R For all styles Insulation voltage (1min.) VRMS Non insulated Ω °C Non insulated 70~300(0W) 55/200/56 -50~300 100 Insulation resistance Derating, linear Climatic category Temperature range Thermal resistance °C KW-1 Failure rate (Total , max, 60% conf. lev.) 200 10-9 * h-1 Endurance (P70, 70,1000h) Damp heat ,steady state(40°C,93% r.h.,56d) Climatic sequence Terminal strength Terminal tensile strengths Resistance to soldering heat ( 260°C,10s ) [ [ [ [ ΔR R ΔR R ΔR R ΔR R ]% ]% ]% ]% [ ΔR R ]% Ca.10, Depends on value ±3.0 ±0.5 ±0.5 ±0.5 30 ±0.2 typ. 2.5 Flow time, solder globule test IEC 60068-2-20-T Value imprinted N Solder ability 70 s Making How to Order LRA351-009 R024 J Bulk Part Number Tolerance Resistance Value (Ω) Code R020 R022 R024 R100 Resistance Value 0.020Ω 0.022Ω 0.024Ω 0.100Ω Code F G J K Tolerance ±1% ±2% ±5% ±10% Pack. -Code Code p Bulk Back to 1st Page - Low Ohmic Open Air Resistors (LRA) Version 2010 http://www.token.com.tw/ rfq token.com.tw 03 of 03