Precision Low Ohmic Resistors
(LRA)Product Introduction (LRA)
Low Ohmic Precision Resistors
Open Air (LRA) Series
Thumbnail GalleryOpen Air Precision Low Ohmic Resistors (LRA) Feature Longer Thermal Path.
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 open-air 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 low resistance value 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 RoHS-compliant version is available, as is a non-inductive version for high frequency applications. Contact us with your specific needs. Download PDF Specification Precision Low Ohmic Resistor.
Features :
- Radial leads.
- Non-inductance.
- Solderable Copper Leads.
- Lead (Pb)-free and RoHS compliant.
- ±1%, ±2%, ±5%, ±10% standard tolerance.
- High stability bare metal element open air style.
Applications :
- Automotive, Feedback System.
- Residual Battery Power Detection.
- CPU Drive Control, Power Tool Motor controls.
- Power Supply Shunt, Current Detective, and Current Sensing.
- Inverter and Switching Power Supplies
- High power AC/DC detection.
Dimensions (Unit: mm) (LRA)
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Type | H Max. (Unit: mm) | RM (Unit: mm) | |
LRA350-009 | 6.5 | 10 | |
LRA351-009 | 10.5 | ||
LRA352-009 | 17.0 | ||
LRA351-010 | 8.0 | 15 | |
LRA352-010 | 14.5 | ||
LRA352-010 | 16.1±1.0 | 14.5±1.0 | |
LRA352-010 | 17.1±1.0 | 14.5±1.0 | |
LRA352-011 | 12.0 | 20 |
Construction: |
1. The resistive elements consist of a flat metal-band. |
Characteristic Specification (LRA)
Type | LRA | 350-009 | 351-009 351-010 |
352-009 352-010 352-011 |
Power rating P70 | W | 0.5 | 1.0 | 1.5 |
Resistance range | Ω | R003~R051 | R004~R068 | R006~R10 |
E-series | E24≥R010 | |||
Tolerances | % | ±1, ±2, ±5, ±10 | ||
Temperature coefficient | PPM | ±25~±100 | ||
Max. Cont. working voltage | VRMS | For all styles | ||
Insulation voltage (1min.) | VRMS | Non insulated | ||
Insulation resistance | Ω | Non insulated | ||
Derating, linear | °C | 70~300(0W) | ||
Climatic category | 55/200/56 | |||
Temperature range | °C | -50~300 | ||
Thermal resistance | KW-1 | 200 | 100 | 70 |
Failure rate (Total, max, 60% conf. lev.) | 10-9 * h-1 | Ca.10, Depends on value | ||
Endurance (P70, 70,1000h) | []% | ±3.0 | ||
Damp heat, steady state(40°C,93% r.h.,56d) | []% | ±0.5 | ||
Climatic sequence | []% | ±0.5 | ||
Terminal strength | []% | ±0.5 | ||
Terminal tensile strength | N | 30 | ||
Resistance to soldering heat ( 260°C,10s ) | []% | ±0.2 typ. | ||
Solder ability | s | 2.5 Flow time, solder globule test IEC 60068-2-20-T |
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Making | Value imprinted |
Packing Specification (LRA)
Type | Package | Pieces | Pack.-Code |
LRA350-009 | Bulk | 200pcs | Bulk |
LRA351-009 LRA351-010 |
Bulk | 200pcs | Bulk |
LRA352-010 LRA352-011 |
Bulk | 200pcs | Bulk |
Order Codes (LRA)
LRA351-009 | R024 | J | P | |||||||||||||||||||||||||
1 | 2 | 3 | 4 | |||||||||||||||||||||||||
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Useful Reference of Resistors in PDF download
Chip Current Sense, Open-Air Current Shunts, Axial Current Sense Resistors Series PDF download (1,278KB).
Glossary & Terminology of Current Sense Resistors PDF download (263KB).
Resistor Precautions in Usage PDF download (301KB).
Typical RoHS Reflow Profile PDF download (303KB).
Design & Select Current Sense Resistors PDF download (250KB).
Current Sense Resistors General Information PDF download (220KB).
Selecting The Optimum Resistors PDF download (234KB).
Common Resistor Terminology PDF download (315KB).
What is a Resistor PDF download (562KB).