{"id":10235,"date":"2026-07-09T08:32:56","date_gmt":"2026-07-09T08:32:56","guid":{"rendered":"https:\/\/ic-vendor.com\/pma-a-r500-1\/"},"modified":"2026-07-09T08:35:05","modified_gmt":"2026-07-09T08:35:05","slug":"pma-a-r500-1","status":"publish","type":"post","link":"https:\/\/ic-vendor.com\/zh\/pma-a-r500-1\/","title":{"rendered":"PMA-A-R500-1"},"content":{"rendered":"

\u4ea7\u54c1\u6982\u89c8<\/h2>\n

The PMA-A-R500-1 is a Isabellenhuette product designed for electronic applications. It features compact design with reliable performance characteristics suitable for various industrial and consumer applications.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\nISA-PLAN Precision Current Sense Resistor<\/td>\n<\/tr>\n
Series<\/td>\nPMA<\/td>\n<\/tr>\n
Resistance<\/td>\n500 mOhm<\/td>\n<\/tr>\n
Tolerance<\/td>\n+\/- 1%<\/td>\n<\/tr>\n
Power Rating<\/td>\n3 W<\/td>\n<\/tr>\n
Temperature Coefficient (20-60C)<\/td>\n< 30 ppm\/K<\/td>\n<\/tr>\n
Max Constant Current<\/td>\n2.45 A<\/td>\n<\/tr>\n
Internal Thermal Resistance (Rthi)<\/td>\n< 10 K\/W<\/td>\n<\/tr>\n
Dielectric Withstanding Voltage<\/td>\n100 VAC<\/td>\n<\/tr>\n
Inductance<\/td>\n< 10 nH<\/td>\n<\/tr>\n
Stability (2000h at rated power)<\/td>\n< 0.5% (TK=95C), < 1.0% (TK=110C)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-55 C to +140 C<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\n3924 (10.0 x 6.0 x 1.9 mm)<\/td>\n<\/tr>\n
Assembly<\/td>\nFlip-chip (reflow, IR, wave soldering)<\/td>\n<\/tr>\n
Tape Width<\/td>\n16 mm<\/td>\n<\/tr>\n
Parts per Reel<\/td>\n3000<\/td>\n<\/tr>\n
RoHS<\/td>\n2011\/65\/EU Compliant<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n

ISA-PLAN Manganin precision current sense resistor; 500 mOhm with +\/-1% tolerance; 3W power rating in compact 3924 SMD package; Low TCR of <30 ppmk using manganin alloy; excellent long-term stability (<0.5% after 2000h at 95c); flip-chip assembly for low parasitic inductance (<10 nh); dielectric withstanding voltage 100vac; reflow, ir and wave soldering compatible; tape reel packaging (3000 units reel);rohs 2011 65eucompliant\n\n\n\n

\u5e94\u7528<\/h2>\n

Current sensing in power hybrid modules; Switch mode power supplies (SMPS); Battery management systems; Motor drive current monitoring; Power module current measurement; Industrial automation; Automotive current sensing; Inverter current feedback<\/p>","protected":false},"excerpt":{"rendered":"

Product Overview The PMA-A-R500-1 is a Isabellenhuette product designed for electronic applications. It features compact design with reliable performance characteristics suitable for various industrial and consumer applications. Key Specifications Type ISA-PLAN Precision Current Sense Resistor Series PMA Resistance 500 mOhm Tolerance +\/- 1% Power Rating 3 W Temperature Coefficient (20-60C) < 30 ppm\/K Max Constant […]\n<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[13,15],"tags":[1489],"chip_brand":[1485],"class_list":["post-10235","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-logic-chips","tag-pma-a-r500-1","chip_brand-isabellenhuette"],"acf":{"brief_explanation":"500mOhm ISA-PLAN Manganin current sense resistor, 3W, 1%, <30ppm\/K, 3924 SMD, flip-chip","date_code":"","package_case":"3924 (10.0 x 6.0 x 1.9 mm)","in_stock":7321,"datasheet":"https:\/\/www.isabellenhuette.de\/fileadmin\/user_upload\/Datenblaetter\/PMA.pdf","price":"$3.50 @ 1ku","product_introduction":"The PMA-A-R500-1 from Isabellenhuette is a 500 mOhm ISA-PLAN precision current sense resistor in the 3924 SMD package, utilizing the proprietary Manganin resistive alloy on a ceramic substrate. The ISA-PLAN construction employs a flat resistive element bonded to an alumina carrier, providing excellent thermal management with an internal thermal resistance of less than 10 K\/W. The Manganin alloy delivers an exceptionally low temperature coefficient of less than 30 ppm\/K in the 20-60C range, ensuring measurement accuracy across varying operating conditions. With a 3W power rating and 2.45A maximum constant current, the PMA-A-R500-1 is designed for flip-chip assembly directly onto PCB copper pads, minimizing parasitic inductance to less than 10 nH for high-frequency current sensing applications. The device demonstrates outstanding long-term stability, with resistance deviation of less than 0.5% after 2000 hours at rated power with a terminal temperature of 95C. Tape and reel packaging with 3000 units per 16mm tape enables automated SMT production.","working_principle":"The PMA-A-R500-1 operates as a precision shunt resistor where current flowing through the 500 mOhm Manganin element produces a proportional voltage drop according to Ohm's law (V = I x R). For a 2A load current, the sense voltage is 1.0V, which is directly measurable by an ADC without amplification. The Manganin alloy (copper-manganese-nickel) exhibits a remarkably flat resistance-temperature characteristic around room temperature, with a TCR of less than 30 ppm\/K in the 20-60C range. This is achieved because Manganin has a parabolic temperature dependence with its turnover point near 20-30C, where the positive and negative TCR contributions cancel. The ISA-PLAN construction bonds the resistive foil directly to the alumina ceramic substrate, providing a low thermal resistance path from the resistive element to the PCB through the solder joints. The flip-chip assembly eliminates wire bonds or lead frames that would add parasitic inductance, resulting in less than 10 nH total inductance suitable for switching frequencies in the hundreds of kHz range.","pin_description":"
Terminal<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
Pad 1<\/td>Current Input (Force+)<\/td>Current<\/td>Current input terminal; carries load current through the resistive element<\/td><\/tr>
Pad 1 (inner)<\/td>Sense+ (Kelvin)<\/td>Voltage<\/td>Kelvin sense terminal for positive voltage measurement; separate pad from force terminal for accurate sensing<\/td><\/tr>
Pad 2<\/td>Current Output (Force-)<\/td>Current<\/td>Current output terminal; carries load current away from the resistive element<\/td><\/tr>
Pad 2 (inner)<\/td>Sense- (Kelvin)<\/td>Voltage<\/td>Kelvin sense terminal for negative voltage measurement; separate pad from force terminal<\/td><\/tr><\/table>","application_scenarios":"
  • Power Module Current Sensing:<\/strong> Provides precise current measurement in IGBT and MOSFET power modules with flip-chip assembly enabling direct integration into hybrid designs.<\/li>
  • SMPS Current Mode Control:<\/strong> Delivers cycle-by-cycle current feedback in switch mode power supplies with <10 nH inductance preserving signal integrity at high switching frequencies.<\/li>
  • Battery Management:<\/strong> Monitors charge and discharge currents in industrial battery systems with <30 ppm\/K TCR ensuring accuracy over temperature.<\/li>
  • Motor Drive Protection:<\/strong> Senses phase currents in motor drives with 3W power handling for overload detection and 0.5% long-term stability.<\/li><\/ul>","alternative_models":"
    Manufacturer<\/th>Part Number<\/th>Package<\/th>Resistance<\/th>Notes<\/th><\/tr>
    Isabellenhuette<\/td>PMA-A-R220-1.0<\/td>3924<\/td>220 mOhm<\/td>Same series, lower resistance<\/td><\/tr>
    Isabellenhuette<\/td>PMA-A-R100-1.0<\/td>3924<\/td>100 mOhm<\/td>Same series, 100 mOhm<\/td><\/tr>
    Isabellenhuette<\/td>PMB-A-R500-1.0<\/td>5930<\/td>500 mOhm<\/td>Larger package, higher power (5W)<\/td><\/tr>
    TT Electronics<\/td>ULR1-R500FT2<\/td>2512<\/td>500 mOhm<\/td>Metal alloy, 1W, AEC-Q200<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10235","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/comments?post=10235"}],"version-history":[{"count":0,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/posts\/10235\/revisions"}],"wp:attachment":[{"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/media?parent=10235"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/categories?post=10235"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/tags?post=10235"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/ic-vendor.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=10235"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}