BR

BR

BR

Product catalog summary
Overview: The document is a technical specification for the BR Series Bare Element Current Sense Resistor by Stackpole Electronics, Inc. It outlines the product features, specifications, applications, and ordering information.
Specifications: The BR Series resistors are available in power ratings of 1W, 3W, and 5W at 85ºC. They have an ohmic range of 0.005 to 0.1 ohms with tolerances of 1%, 2%, and 5%. The resistors are designed with all welded construction, are flameproof, non-inductive, and can handle high currents up to 70 amps. They are RoHS compliant and lead-free.
Features: Key features include low inductance, high current handling, and suitability for current sensing and feedback applications. The resistors are also designed to handle surge and pulse conditions.
Mechanical Specifications: The document provides detailed dimensions for different resistor types (BR1, BR3, BR5) in both inches and millimeters, highlighting the variations in element width based on resistance value.
Performance Characteristics: The resistors exhibit moisture resistance with a tolerance of ±1% and load life at 25ºC for 1,000 hours with a tolerance of ±2%. The temperature cycle performance is ±1% at -40ºC and +125ºC over 1,000 cycles.
Power Derating Curve: A graph illustrates the power derating curve, indicating the percentage of rated power at various ambient temperatures. The maximum recommended solder joint/lead stop temperature is +105ºC.
High Power Chip Resistors and Thermal Management: The document discusses the challenges of using high power resistors at elevated temperatures and suggests thermal management techniques such as wider conductor traces, larger solder pads, heavier copper, and heat sinks to manage heat rise effectively.
Ordering Information: The document provides a guide on how to order the resistors, including size, power, tolerance, resistance value, and packaging options.
Design Considerations: It is noted that the final resistance value can be affected by board layout and assembly processes, particularly for resistance values ≤ 50 mΩ. This should be considered during design.
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Catalog excerpts

BR-1

Bare Element Current Sense Resistor Resistive Product Solutions 1, 3 and 5 watts ±1%, ±2% or ±5% tolerance ±20 ppm/ºC element wire ±200 ppm/ºC at lead stops All welded construction Flameproof Non-inductive (10nH max) High current handling to 70 amps RoHS compliant / lead-free Current sensing Feedback Low inductance Surge and pulse Electrical Specifications Power Rating (Watts) Type / Code Ohmic Range (Ω) and Tolerance (1) 1%, 2%, 5% (1) Contact factory for resistance values below 0.005Ω. Product photo shown above is typical. Actual components may vary depending on element wire size and amount of trim adjusting required to meet desired resistance value. Please refer to the High Power Resistor Application Note (page 3) for more information on designing and implementing high power resistor types. Mechanical Specifications Element width varies depending on resistance value. A Type / Code Rev Date: 11/04/2015 This specification may be changed at any time without prior notice Please confirm technical specifications before you order and/or use.

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BR-2

Bare Element Current Sense Resistor Resistive Product Solutions Performance Characteristics Test Test Results Moisture Resistance Power Derating Curve: Percent Rated Power (%) Ambient Temperature (ºC) Note: Maximum recommended solder joint/lead stop temperature = +105ºC Product Series BR Current Sense Rev Date: 11/04/2015 This specification may be changed at any time without prior notice Please confirm technical specifications before you order and/or use. Packaging Description Size Bulk All Sizes Resistance Value Four characters with the multiplier used as the decimal holder. "L" used as multiplier...

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BR-3

Bare Element Current Sense Resistor Resistive Product Solutions High Power Chip Resistors and Thermal Management Stackpole has developed several surface mount resistor series in addition to our current sense resistors, which have had higher power ratings than standard resistor chips. This has caused some uncertainty and even confusion by users as to how to reliably use these resistors at the higher power ratings in their designs. The data sheets for the RHC, RMCP, RNCP, CSR, CSRN, CSRF, CSS, and CSSH state that the rated power assumes an ambient temperature of no more than 100 degrees C for the...

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