BR3FBR100

BR Series Stackpole Electronics, Inc. Bare Element Current Sensing Resistor Resistive Product Solutions Features: • • • • • • • • • • • 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 31 amps 100% RoHS compliant and lead free without exemption Halogen free REACH compliant Applications: • • • • Current sensing Feedback Low inductance Surge and pulse Electrical Specifications Ohmic Range (Ω) and Tolerance 1%, 2%, 5% 0.005 - 0.1 0.005 - 0.1 0.005 - 0.05 Power Rating (W) at 85ºC 1 3 5 Type/Code (1) BR1 BR3 BR5 (1) Contact factory for resistance values below 0.005 Ω. 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. Type/Code BR1 BR3 BR5 A 0.450 11.43 0.602 15.30 0.800 20.32 ± ± ± ± ± ± B 0.040 1.02 0.040 1.02 0.040 1.02 0.200 5.08 0.800 20.32 0.800 20.32 Rev Date: 10/8/2021 This specification may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. ± ± ± ± ± ± C 0.100 2.54 0.200 5.08 0.200 5.08 0.125 3.18 0.125 3.18 0.125 3.18 1 ± ± ± ± ± ± D 0.030 0.76 0.030 0.76 0.030 0.76 0.065 1.65 0.065 1.65 0.065 1.65 ± ± ± ± ± ± E 0.010 0.25 0.010 0.25 0.010 0.25 0.04 1.02 0.04 1.02 0.04 1.02 ± ± ± ± ± ± Unit 0.002 0.05 0.002 0.05 0.002 0.05 inches mm inches mm inches mm www.seielect.com marketing@seielect.com BR Series Stackpole Electronics, Inc. Bare Element Current Sensing Resistor Resistive Product Solutions Performance Characteristics Test Test Specification Moisture Resistance Load Life @ 25ºC - 1000 hours Temperature Cycle @ -40ºC & +125ºC (1000 cycles) Operating temperature range is -65ºC to +350ºC ± 1% ± 2%, + 0.0005 Ω ± 1% Power Derating Curve: Note: Maximum recommended solder joint/lead stop temperature = +105ºC Recommended Solder Profile This information is intended as a reference for solder profiles for Stackpole resistive components. These profiles should be compatible with most soldering processes. These are only recommendations. Actual numbers will depend on board density, geometry, packages used, etc., especially those cells labeled with “*”. 100% Matte Tin / RoHS Compliant Terminations Soldering iron recommended temperatures: 330°C to 350°C with minimum duration. Maximum number of reflow cycles: 3. Wave Soldering Description Maximum Recommended Preheat Time 80 seconds 70 seconds Temperature Diff. 140°C 120°C Solder Temp. 260°C 250°C Dwell Time at Max. 10 seconds 5 seconds Ramp DN (°C/sec) N/A N/A Temperature Diff. = Defference between final preheat stage and soldering stage. Minimum 60 seconds 100°C 240°C * N/A Convection IR Reflow Description Maximum Recommended Minimum Ramp Up (°C/sec) Dwell Time > 217°C Solder Temp. Dwell Time at Max. Ramp DN (°C/sec) 3°C/sec 150 seconds 260°C 30 seconds 6°C/sec 2°C/sec 90 seconds 245°C 15 seconds 3°C/sec * 60 seconds * 10 seconds * Rev Date: 10/8/2021 This specification may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 2 www.seielect.com marketing@seielect.com BR Series Stackpole Electronics, Inc. Bare Element Current Sensing Resistor Resistive Product Solutions Recommended Lead Free Resistor Reflow Profile 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°C for the CSS / CSSH series and 70°C for all other high power resistor series. In addition, IPC and UL best practices dictate that the combined temperature on any resistor due to power dissipated and ambient air shall be no more than 105°C. At first glance this wouldn’t seem too difficult, however the graph below shows typical heat rise for the CSR ½ 100 milliohm at full rated power. The heat rise for the RMCP and RNCP would be similar. The RHC with its unique materials, design, and processes would have less heat rise and therefore would be easier to implement for any given customer. The 102°C heat rise shown here would indicate there will be additional thermal reduction techniques needed to keep this part under 105°C total hot spot temperature if this part is to be used at 0.75 watts of power. However, this same part at the usual power rating for this size would have a heat rise of around 72°C. This additional heat rise may be dealt with using wider conductor traces, larger solder pads and land patterns under the solder mask, heavier copper in the conductors, via through PCB, air movement, and heat sinks, among many other techniques. Because of the variety of methods customers can use to lower the effective heat rise of the circuit, Rev Date: 10/8/2021 This specification may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 3 www.seielect.com marketing@seielect.com BR Series Stackpole Electronics, Inc. Bare Element Current Sensing Resistor Resistive Product Solutions resistor manufacturers simply specify power ratings with the limitations on ambient air temperature and total hot spot temperatures and leave the details of how to best accomplish this to the design engineers. Design guidelines for products in various market segments can vary widely so it would be unnecessarily constraining for a resistor manufacturer to recommend the use of any of these methods over another. Note: The final resistance value can be affected by the board layout and assembly process, especially the size of the mounting pads and the amount of solder used. This is especially notable for resistance values ≤ 50 mΩ. This should be taken into account when designing. RoHS Compliance Stackpole Electronics has joined the worldwide effort to reduce the amount of lead in electronic components and to meet the various regulatory requirements now prevalent, such as the European Union’s directive regarding “Restrictions on Hazardous Substances” (RoHS 3). As part of this ongoing program, we periodically update this document with the status regarding the availability of our compliant components. All our standard part numbers are compliant to EU Directive 2011/65/EU of the European Parliament as amended by Directive (EU) 2015/863/EU as regards the list of restricted substances. RoHS Compliance Status Standard Product Series BR Description Package / Termination Type Standard Series RoHS Compliant Lead-Free Termination Composition Lead-Free Mfg. Effective Date (Std Product Series) Lead-Free Effective Date Code (YY/WW) Open Air Bare Element Current Sense Resistor Special YES 100% Matte Sn Jan-06 06/01 “Conflict Metals” Commitment We at Stackpole Electronics, Inc. are joined with our industry in opposing the use of metals mined in the “conflict region” of the eastern Democratic Republic of the Congo (DRC) in our products. Recognizing that the supply chain for metals used in the electronics industry is very complex, we work closely with our own suppliers to verify to the extent possible that the materials and products we supply do not contain metals sourced from this conflict region. As such, we are in compliance with the requirements of Dodd-Frank Act regarding Conflict Minerals. Compliance to “REACH” We certify that all passive components supplied by Stackpole Electronics, Inc. are SVHC (Substances of Very High Concern) free and compliant with the requirements of EU Directive 1907/2006/EC, “The Registration, Evaluation, Authorization and Restriction of Chemicals”, otherwise referred to as REACH. Contact us for complete list of REACH Substance Candidate List. Environmental Policy It is the policy of Stackpole Electronics, Inc. (SEI) to protect the environment in all localities in which we operate. We continually strive to improve our effect on the environment. We observe all applicable laws and regulations regarding the protection of our environment and all requests related to the environment to which we have agreed. We are committed to the prevention of all forms of pollution. Rev Date: 10/8/2021 This specification may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. 4 www.seielect.com marketing@seielect.com BR Series Stackpole Electronics, Inc. Bare Element Current Sensing Resistor Resistive Product Solutions How to Order B Product Series Code Description Bare Element BR Current Sensing R Power Rating Size W 1 1 3 3 5 5 1 F Tolerance Code Tol F 1% G 2% J 5% Rev Date: 10/8/2021 This specification may be changed at any time without prior notice. Please confirm technical specifications before you order and/or use. B Code B 5 1 0 Packaging Description Size Bulk All Sizes L 0 Quantity 1000 Resistance Value Four characters with the multiplier used as the decimal holder. "L" used as multiplier -3 of 10 for any value under 0.1 ohm. 0.005 ohm = 5L00 0.05 ohm = 50L0 0.1 ohm = R100 www.seielect.com marketing@seielect.com