{"id":1436,"date":"2018-06-29T20:17:27","date_gmt":"2018-06-29T20:17:27","guid":{"rendered":"https:\/\/riedon.com\/blog\/?p=1436"},"modified":"2018-06-29T20:19:19","modified_gmt":"2018-06-29T20:19:19","slug":"riedons-pf2272-pf2273-now-resistance-values-1mohm","status":"publish","type":"post","link":"https:\/\/riedon.com\/blog\/riedons-pf2272-pf2273-now-resistance-values-1mohm\/","title":{"rendered":"Riedon’s PF2272 and PF2273 now with resistance values up to 1Mohm"},"content":{"rendered":"

Riedon’s PF2272 and PF2274 now feature resistance values up to 1Mohm<\/h3>\n
\"PF2272<\/a>

PF2272 TO-227 package<\/p><\/div>\n

Advanced manufacturing techniques have allowed Riedon to extend the resistance values available for our two hundred watt (PF2272) and three hundred watt (PF2274) TO-227 packages from 100K\u2126 to 1M\u2126.<\/p>\n

By offering an exceptionally low inductance of 13.7nH and capacitance of 13.1pF the PF2270 <\/a>series is suitable for a wide range of frequencies and applications. \u00a0The PF2270 <\/a>series also includes a standard insulation voltage of 2.5kV with higher values available on request as well as a completely resin filled chamber to enhance insulation voltage and provide for the ultimate in durability and enhanced stability.\u00a0 \u00a0\u00a0While these features are already class leading, the extended resistance range increases the versatility of this compact package even further.<\/p>\n

Good thermal management is a must!<\/h3>\n

Thermal management is extremely important when working with such compact, yet highly powerful, resistors such as those in the PF2270 series.\u00a0 Careful calculations using the following formula should be performed to determine a correctly sized heat sink or chiller plate:<\/p>\n

R\u03b8H<\/sub> = (TMAX <\/sub>\u2013 (P * R\u03b8R<\/sub>) – TA<\/sub>)\/ P<\/p>\n

Where:
\nR\u03b8H<\/sub> = Thermal Resistance of Heatsink ( \u00b0K\/W )
\nR\u03b8R<\/sub> = Thermal Resistance of Resistor ( \u00b0K\/W )
\nTMAX<\/sub> = Maximum Temperature of Resistor ( \u00b0C )
\nTA<\/sub> = Ambient Temperature of Heatsink ( \u00b0C )
\nP = Power Through Resistor ( W )<\/p>\n

As an example, let\u2019s calculate the required thermal resistance for a heat sink and thermal interface material for an application requiring 150 watts in a normal operating environment of 30\u00b0C.\u00a0 The remaining two variables can be obtained directly from the datasheet <\/a>and results in a R\u03b8R<\/sub> of 0.35 \u00b0K\/W and a TMAX<\/sub> = 155\u00b0C.<\/p>\n

R\u03b8H<\/sub> = (155 \u2013 (150*0.35) \u2013 30)\/150<\/p>\n

This calculation results in a heat sink and thermal interface (grease, pad, etc.) with a thermal resistance equal to or less than 0.48 \u00b0K\/W to safely operate the resistor at this power level.<\/p>\n","protected":false},"excerpt":{"rendered":"

Riedon’s PF2272 and PF2274 now feature resistance values up to 1Mohm Advanced manufacturing techniques have allowed Riedon to extend the resistance values available for our two hundred watt (PF2272) and three hundred watt (PF2274) TO-227 packages from 100K\u2126 to 1M\u2126. By offering an exceptionally low inductance of 13.7nH and capacitance of 13.1pF the PF2270 series […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[383],"tags":[211,328],"class_list":["post-1436","post","type-post","status-publish","format-standard","hentry","category-power-resistors","tag-high-power-resistors","tag-high-resistance-value"],"yoast_head":"\nRiedon's PF2272 and PF2273 now with resistance values up to 1Mohm - Riedon Company Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/riedon.com\/blog\/riedons-pf2272-pf2273-now-resistance-values-1mohm\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Riedon's PF2272 and PF2273 now with resistance values up to 1Mohm - Riedon Company Blog\" \/>\n<meta property=\"og:description\" content=\"Riedon’s PF2272 and PF2274 now feature resistance values up to 1Mohm Advanced manufacturing techniques have allowed Riedon to extend the resistance values available for our two hundred watt (PF2272) and three hundred watt (PF2274) TO-227 packages from 100K\u2126 to 1M\u2126. By offering an exceptionally low inductance of 13.7nH and capacitance of 13.1pF the PF2270 series […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/riedon.com\/blog\/riedons-pf2272-pf2273-now-resistance-values-1mohm\/\" \/>\n<meta property=\"og:site_name\" content=\"Riedon Company Blog\" \/>\n<meta property=\"article:published_time\" content=\"2018-06-29T20:17:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2018-06-29T20:19:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/riedon.com\/blog\/wp-content\/uploads\/2016\/03\/PF2272-v1-300x199.jpg\" \/>\n<meta name=\"author\" content=\"Frida Hovsepian\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Frida Hovsepian\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/riedon.com\/blog\/riedons-pf2272-pf2273-now-resistance-values-1mohm\/\",\"url\":\"https:\/\/riedon.com\/blog\/riedons-pf2272-pf2273-now-resistance-values-1mohm\/\",\"name\":\"Riedon's PF2272 and PF2273 now with resistance values up to 1Mohm - 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