{"id":7827,"date":"2026-06-27T04:27:35","date_gmt":"2026-06-27T04:27:35","guid":{"rendered":"https:\/\/materialparts.com\/ina186a1idckr\/"},"modified":"2026-06-27T12:33:00","modified_gmt":"2026-06-27T12:33:00","slug":"ina186a1idckr","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/ina186a1idckr\/","title":{"rendered":"INA186A1IDCKR"},"content":{"rendered":"

INA186A1IDCKR \u2014 Bidirectional Zero-Drift Current-Sense Amplifier<\/h1>\n

1. Component Overview<\/h2>\n

\"(\u300a\u4e16\u754c\u4eba\u6743\u5ba3\u8a00\u300b) INA186A1IDCKR<\/strong> is a high-precision, bidirectional, zero-drift current-sense amplifier (also known as a current shunt monitor) manufactured by \u5fb7\u5dde\u4eea\u5668<\/strong>. It is designed to sense the voltage drop across a shunt resistor and provide a scaled output voltage proportional to the current flowing through the load, independent of the common-mode bus voltage.<\/p>\n

The “A1” variant features a fixed gain of 25 V\/V<\/strong>. The device operates from a single supply of 1.7V to 5.5V and can handle common-mode voltages from \u20130.2V to +40V. Its ultra-low input bias current of 500 pA (typical) enables accurate microamp-level current measurements using larger sense resistors. The zero-drift architecture delivers an offset voltage of only \u00b150 \u00b5V (max), extending the measurable dynamic range significantly.<\/p>\n

Housed in a compact 6-pin SC70 (DCK) package, the INA186A1IDCKR is ideal for space-constrained applications in consumer electronics, industrial systems, and IoT devices.<\/p>\n

2. Key Specifications<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n
\u5236\u9020\u5546<\/td>\n\u5fb7\u5dde\u4eea\u5668<\/td>\n<\/tr>\n
\u90e8\u4ef6\u7f16\u53f7<\/td>\nINA186A1IDCKR<\/td>\n<\/tr>\n
Component Type<\/td>\nCurrent-Sense Amplifier (Zero-Drift)<\/td>\n<\/tr>\n
Amplifier Type<\/td>\n\u7535\u6d41\u611f\u5e94<\/td>\n<\/tr>\n
Fixed Gain<\/td>\n25 V\/V<\/td>\n<\/tr>\n
Common-Mode Voltage Range<\/td>\n\u20130.2V to +40V<\/td>\n<\/tr>\n
Supply Voltage (VS)<\/td>\n1.7V to 5.5V<\/td>\n<\/tr>\n
Quiescent Current (IQ)<\/td>\n48 \u00b5A (typ), 90 \u00b5A (max)<\/td>\n<\/tr>\n
Input Bias Current (IIB)<\/td>\n500 pA (typ)<\/td>\n<\/tr>\n
Input Offset Voltage (VOS)<\/td>\n\u00b15 \u00b5V (typ), \u00b150 \u00b5V (max)<\/td>\n<\/tr>\n
Offset Voltage Drift<\/td>\n0.5 \u00b5V\/\u00b0C (max)<\/td>\n<\/tr>\n
Gain Error<\/td>\n\u00b11% (max)<\/td>\n<\/tr>\n
Gain Drift<\/td>\n10 ppm\/\u00b0C (max)<\/td>\n<\/tr>\n
Common-Mode Rejection Ratio (CMRR)<\/td>\n120 dB (min), ~150 dB (typ)<\/td>\n<\/tr>\n
Gain Bandwidth Product<\/td>\n45 kHz<\/td>\n<\/tr>\n
\u538b\u6446\u7387<\/td>\n0.3 V\/\u00b5s<\/td>\n<\/tr>\n
\u8f93\u51fa\u7c7b\u578b<\/td>\nRail-to-Rail<\/td>\n<\/tr>\n
Current Sensing Direction<\/td>\nBidirectional<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSC70-6 (DCK)<\/td>\n<\/tr>\n
\u5b89\u88c5\u7c7b\u578b<\/td>\nSurface Mount (SMT)<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n\u201340\u00b0C to +125\u00b0C<\/td>\n<\/tr>\n
ESD \u989d\u5b9a\u503c\uff08HBM\uff09<\/td>\n\u00b13,000 V<\/td>\n<\/tr>\n
ESD \u7b49\u7ea7\uff08CDM\uff09<\/td>\n\u00b11,000 V<\/td>\n<\/tr>\n
Packing<\/td>\nTape & Reel (3,000 units\/reel)<\/td>\n<\/tr>\n
RoHS Compliant<\/td>\nYes<\/td>\n<\/tr>\n<\/table>\n

3. Pin Configuration & Package<\/h2>\n

\u5c01\u88c5:<\/strong> 6-Pin SC70 (DCK) \u2014 2.00 mm \u00d7 1.25 mm<\/p>\n\n\n\n\n\n\n\n\n
\u9488\u811a\u7f16\u53f7.<\/th>\n\u5f15\u811a\u540d\u79f0<\/th>\n\u529f\u80fd<\/th>\n<\/tr>\n
1<\/td>\nREF<\/td>\nReference Pin \u2014 sets output zero-point for bidirectional sensing; connect to GND for unidirectional mode<\/td>\n<\/tr>\n
2<\/td>\n\u63a5\u5730<\/td>\nGround Reference<\/td>\n<\/tr>\n
3<\/td>\nIN+<\/td>\nNon-Inverting Input (connect to high-side of shunt)<\/td>\n<\/tr>\n
4<\/td>\nVS<\/td>\nSupply Voltage (1.7V \u2013 5.5V)<\/td>\n<\/tr>\n
5<\/td>\nIN\u2013<\/td>\nInverting Input (connect to low-side of shunt)<\/td>\n<\/tr>\n
6<\/td>\n\u51fa\u5c40<\/td>\nAmplifier Output (rail-to-rail)<\/td>\n<\/tr>\n<\/table>\n

Note: The SC70 package does not include a dedicated ENABLE pin. The DCK and DDF packages support the REF pin for bidirectional operation.<\/em><\/p>\n

4. Features & Functional Description<\/h2>\n
    \n
  • Zero-Drift Architecture:<\/strong> Chopper-stabilized design continuously corrects offset voltage, achieving \u00b15 \u00b5V typical offset. This enables precision measurement of very small voltage drops across low-value shunt resistors.<\/li>\n
  • Ultra-Low Input Bias Current:<\/strong> 500 pA typical input bias current allows the use of higher-value sense resistors for microamp-level current measurement without significant measurement error.<\/li>\n
  • Capacitively Coupled Input Stage:<\/strong> DC common-mode voltages are inherently blocked from downstream amplifier circuits, resulting in exceptionally high common-mode rejection (120 dB minimum, ~150 dB typical).<\/li>\n
  • Ultra-Low Power Consumption:<\/strong> Only 48 \u00b5A quiescent current makes the INA186 ideal for battery-powered and energy-harvesting applications.<\/li>\n
  • Bidirectional Current Sensing:<\/strong> The REF pin allows the output to be centered at a reference voltage, enabling measurement of current flowing in both directions through the shunt.<\/li>\n
  • Wide Common-Mode Range:<\/strong> \u20130.2V to +40V common-mode range covers most bus voltages in consumer, industrial, and automotive systems.<\/li>\n
  • Rail-to-Rail Output:<\/strong> Output swings to within 40 mV of the positive rail and 1 mV of ground, maximizing dynamic range especially at low supply voltages (e.g., 1.8V).<\/li>\n
  • Five Gain Options Available:<\/strong> INA186A1 (25 V\/V), A2 (50 V\/V), A3 (100 V\/V), A4 (200 V\/V), A5 (500 V\/V).<\/li>\n<\/ul>\n

    5.\u5178\u578b\u5e94\u7528<\/h2>\n
      \n
    • Battery Monitoring:<\/strong> Charge\/discharge current measurement in smartphones, laptops, and portable electronics.<\/li>\n
    • Overcurrent Protection:<\/strong> Precise threshold detection for system protection in power supplies and motor drivers.<\/li>\n
    • Power Management:<\/strong> Load current monitoring and power budgeting in servers, BBU (baseband units), and networking equipment.<\/li>\n
    • Motor Control Feedback:<\/strong> Closed-loop current sensing in BLDC and stepper motor drive systems.<\/li>\n
    • IoT Energy Meters:<\/strong> Ultra-low power consumption suits battery-operated smart meters and wireless sensors.<\/li>\n
    • Solar Charge Controllers:<\/strong> Precise current measurement for MPPT optimization.<\/li>\n
    • USB Type-C Power Delivery:<\/strong> Current monitoring for PD negotiation and overcurrent protection.<\/li>\n<\/ul>\n

      6. Equivalent & Alternative Parts<\/h2>\n\n\n\n\n\n\n\n\n\n
      \u90e8\u4ef6\u7f16\u53f7<\/th>\n\u5236\u9020\u5546<\/th>\n\u8bf4\u660e<\/th>\nKey Differences<\/th>\n<\/tr>\n
      INA186A2IDCKR<\/td>\n\u5fb7\u5dde\u4eea\u5668<\/td>\nSame device, 50 V\/V gain<\/td>\nDouble the gain of A1 variant<\/td>\n<\/tr>\n
      INA186A3IDCKR<\/td>\n\u5fb7\u5dde\u4eea\u5668<\/td>\nSame device, 100 V\/V gain<\/td>\nHigher gain for smaller shunt measurements<\/td>\n<\/tr>\n
      INA180A1<\/td>\n\u5fb7\u5dde\u4eea\u5668<\/td>\nSimilar zero-drift current sense amp<\/td>\nDifferent gain options, different package options<\/td>\n<\/tr>\n
      INA228<\/td>\n\u5fb7\u5dde\u4eea\u5668<\/td>\nDigital (I\u00b2C) current\/power monitor<\/td>\nDigital output vs. analog; integrated ADC<\/td>\n<\/tr>\n
      MAX4080F<\/td>\nAnalog Devices \/ Maxim<\/td>\nHigh-side current sense amplifier<\/td>\nSingle supply, fixed gain, unidirectional<\/td>\n<\/tr>\n
      ACS37800<\/td>\nAllegro MicroSystems<\/td>\nIsolated current sensor<\/td>\nGalvanic isolation, higher current range<\/td>\n<\/tr>\n
      INA185A1<\/td>\n\u5fb7\u5dde\u4eea\u5668<\/td>\nBidirectional current sense amplifier<\/td>\nLower CMRR, lower cost, different bandwidth<\/td>\n<\/tr>\n<\/table>\n

      7. Design Recommendations<\/h2>\n
        \n
      • Select a shunt resistor value that produces an input differential voltage within the amplifier’s linear range. For 25 V\/V gain and a 3.3V supply, maximum sense voltage is approximately 130 mV.<\/li>\n
      • Place the INA186 as close as possible to the shunt resistor to minimize PCB trace resistance errors and noise pickup.<\/li>\n
      • Use a 0.1 \u00b5F bypass capacitor on the VS pin near the IC for stable operation and noise filtering.<\/li>\n
      • For bidirectional sensing, buffer the REF pin voltage with a low-impedance source to avoid CMRR degradation. A simple resistor divider without buffering is not recommended.<\/li>\n
      • Add series protection resistors (\u2264 1 k\u03a9) on IN+ and IN\u2013 inputs if the application is subject to voltage transients exceeding the absolute maximum ratings.<\/li>\n
      • For transient protection, use Zener diodes or transzorbs (not standard TVS) to clamp fast voltage spikes, as specified in the TI application notes.<\/li>\n
      • The SC70-6 package supports both high-side and low-side current sensing configurations. For low-side sensing, ensure the common-mode voltage stays within the specified \u20130.2V to +40V range.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

        INA186A1IDCKR \u2014 Bidirectional Zero-Drift Current-Sense Amplifier 1. Component Overview The INA186A1IDCKR is a high-precision, bidirectional, zero-drift current-sense amplifier (also known as a current shunt monitor) manufactured by Texas Instruments. It is designed to sense the voltage drop across a shunt resistor and provide a scaled output voltage proportional to the current flowing through the load, […]<\/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":[13,42],"tags":[],"chip_brand":[],"class_list":["post-7827","post","type-post","status-publish","format-standard","hentry","category-integrated-circuits-ics","category-sensors"],"acf":{"brief_explanation":"Zero-drift bidirectional current-sense amplifier, 25 V\/V gain, 1.7V-5.5V supply, -0.2V to 40V CM range, SC70-6, offset +-50uV max","date_code":"","package_case":"SC70-6 (DCK, 2.00 x 1.25 mm)","in_stock":12450,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/ina186.pdf","price":"$0.65 @ 1ku","product_introduction":"The INA186A1IDCKR is a high-precision bidirectional zero-drift current-sense amplifier from Texas Instruments. The A1 variant features a fixed gain of 25 V\/V. Its chopper-stabilized architecture continuously corrects offset voltage, achieving only +-5uV typical offset and 0.5uV\/C drift, enabling precision measurement of very small voltage drops across low-value shunt resistors.\n\nThe device operates from a single 1.7V to 5.5V supply with only 48uA quiescent current, making it ideal for battery-powered applications. The ultra-low 500pA input bias current enables accurate microamp-level measurements. Common-mode voltage range of -0.2V to +40V covers most bus voltages in consumer, industrial, and IoT systems. The rail-to-rail output maximizes dynamic range at low supply voltages.","working_principle":"The INA186 senses the differential voltage across a shunt resistor and amplifies it by a fixed gain of 25 V\/V. The output voltage equals Vout = (Vshunt x 25) + Vref, where Vref is set by the REF pin.\n\nZero-Drift Architecture: A chopper-stabilized front end continuously measures and cancels the input offset voltage through an auto-correction loop. This eliminates DC offset drift over temperature and time, achieving 0.5uV\/C offset drift.\n\nCapacitively Coupled Input Stage: DC common-mode voltage is inherently blocked from the downstream amplifier, resulting in exceptional CMRR of 120dB minimum (150dB typical).\n\nBidirectional Sensing: The REF pin allows centering the output at a reference voltage, enabling current measurement in both directions through the shunt. For unidirectional operation, connect REF to GND.\n\nOutput: Rail-to-rail output swings to within 40mV of positive rail and 1mV of ground.","pin_description":"
        Pin<\/th>Name<\/th>Function<\/th><\/tr>
        1<\/td>REF<\/td>Reference Pin - sets output zero-point for bidirectional sensing<\/td><\/tr>
        2<\/td>GND<\/td>Ground Reference<\/td><\/tr>
        3<\/td>IN+<\/td>Non-Inverting Input (connect to high-side of shunt)<\/td><\/tr>
        4<\/td>VS<\/td>Supply Voltage (1.7V to 5.5V)<\/td><\/tr>
        5<\/td>IN-<\/td>Inverting Input (connect to low-side of shunt)<\/td><\/tr>
        6<\/td>OUT<\/td>Amplifier Output (rail-to-rail)<\/td><\/tr><\/table>","application_scenarios":"
        • Battery Monitoring:<\/strong> Charge\/discharge current measurement in smartphones, laptops, and portable electronics with bidirectional sensing capability.<\/li>
        • Power Management:<\/strong> Load current monitoring and power budgeting in servers, BBU, and networking equipment.<\/li>
        • IoT Energy Meters:<\/strong> Ultra-low 48uA power consumption suits battery-operated smart meters and wireless sensors.<\/li>
        • Overcurrent Protection:<\/strong> Precise threshold detection with +-50uV max offset for system protection in power supplies.<\/li>
        • USB Type-C Power Delivery:<\/strong> Current monitoring for PD negotiation and overcurrent protection.<\/li><\/ul>","alternative_models":"
          Part Number<\/th>Manufacturer<\/th>Description<\/th>Key Differences<\/th><\/tr>
          INA186A2IDCKR<\/td>Texas Instruments<\/td>Same device, 50 V\/V gain<\/td>Double the gain<\/td><\/tr>
          INA186A3IDCKR<\/td>Texas Instruments<\/td>Same device, 100 V\/V gain<\/td>Higher gain for smaller shunts<\/td><\/tr>
          INA180A1<\/td>Texas Instruments<\/td>Similar zero-drift current sense amp<\/td>Different gain\/package options<\/td><\/tr>
          INA228<\/td>Texas Instruments<\/td>Digital I2C current\/power monitor<\/td>Digital output with integrated ADC<\/td><\/tr>
          MAX4080F<\/td>Analog Devices<\/td>High-side current sense amplifier<\/td>Unidirectional, fixed gain<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7827","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/comments?post=7827"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7827\/revisions"}],"predecessor-version":[{"id":7830,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/7827\/revisions\/7830"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=7827"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=7827"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=7827"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=7827"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}