{"id":6834,"date":"2026-06-21T12:49:12","date_gmt":"2026-06-21T12:49:12","guid":{"rendered":"https:\/\/materialparts.com\/opa2227u\/"},"modified":"2026-06-21T12:49:12","modified_gmt":"2026-06-21T12:49:12","slug":"opa2227u","status":"publish","type":"post","link":"https:\/\/materialparts.com\/zh\/opa2227u\/","title":{"rendered":"OPA2227U"},"content":{"rendered":"

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

The OPA2227U from Texas Instruments is a dual low-noise precision operational amplifier with 3 nV\/sqrt(Hz) noise, 2.5 V\/us slew rate, and +\/-10 uV offset in a DIP-8 or SOIC-8 package.<\/p>\n

\u4e3b\u8981\u89c4\u683c<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u578b<\/td>\nDual Low-Noise Precision Operational Amplifier<\/td>\n<\/tr>\n
\u6e20\u9053<\/td>\n2<\/td>\n<\/tr>\n
\u7535\u6e90\u7535\u538b<\/td>\n+\/-5 V to +\/-18 V<\/td>\n<\/tr>\n
Voltage Noise<\/td>\n3 nV\/sqrt(Hz) @ 1kHz<\/td>\n<\/tr>\n
\u8f93\u5165\u5931\u8c03\u7535\u538b<\/td>\n+\/-10 uV (max, A grade)<\/td>\n<\/tr>\n
Offset Drift<\/td>\n0.1 uV\/C (typical)<\/td>\n<\/tr>\n
Gain Bandwidth Product<\/td>\n8 MHz<\/td>\n<\/tr>\n
\u538b\u6446\u7387<\/td>\n2.5 V\/us<\/td>\n<\/tr>\n
CMRR<\/td>\n114 dB (min, A grade)<\/td>\n<\/tr>\n
Open-Loop Gain<\/td>\n120 dB (min)<\/td>\n<\/tr>\n
Supply Current per Channel<\/td>\n3.7 mA (typical)<\/td>\n<\/tr>\n
\u5305\u88c5<\/td>\nSOIC-8<\/td>\n<\/tr>\n
\u5de5\u4f5c\u6e29\u5ea6<\/td>\n-40C to +85C<\/td>\n<\/tr>\n<\/table>\n

\u7279\u70b9<\/h2>\n
    \n
  • Ultra-low 3 nV\/sqrt(Hz) voltage noise<\/li>\n
  • +\/-10 uV max offset voltage (A grade)<\/li>\n
  • 0.1 uV\/C typical offset drift<\/li>\n
  • 114 dB minimum CMRR<\/li>\n
  • 120 dB minimum open-loop gain<\/li>\n
  • De-compensated (stable for gains >= 5)<\/li>\n
  • Drop-in upgrade for OP27\/OP37<\/li>\n<\/ul>\n

    \u5e94\u7528<\/h2>\n
      \n
    • Precision audio preamplifiers<\/li>\n
    • Low-noise instrumentation front-ends<\/li>\n
    • Professional microphone amplifiers<\/li>\n
    • Data acquisition signal conditioning<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The OPA2227U from Texas Instruments is a dual low-noise precision operational amplifier with 3 nV\/sqrt(Hz) noise, 2.5 V\/us slew rate, and +\/-10 uV offset in a DIP-8 or SOIC-8 package. Key Specifications Type Dual Low-Noise Precision Operational Amplifier Channels 2 Supply Voltage +\/-5 V to +\/-18 V Voltage Noise 3 nV\/sqrt(Hz) @ 1kHz […]<\/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":[19,13],"tags":[],"chip_brand":[138],"class_list":["post-6834","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"Dual Low-Noise Op Amp, 3nV\/sqrtHz, +\/-10uV Vos, SOIC-8, Gain>=5","date_code":"","package_case":"SOIC-8 (5.0 x 3.9 x 1.5 mm)","in_stock":4567,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/opa2227.pdf","price":"$4.50 @ 1ku","product_introduction":"The OPA2227U from Texas Instruments is a dual low-noise precision operational amplifier optimized for audio and instrumentation applications. The 3 nV\/sqrt(Hz) voltage noise at 1 kHz is among the lowest available for bipolar input op amps, making it ideal for low-source-impedance signal chains. The +\/-10 uV maximum offset voltage (A grade) and 0.1 uV\/C typical drift eliminate the need for external trimming. The 114 dB minimum CMRR and 120 dB minimum open-loop gain ensure accurate signal processing in precision differential circuits. Note that the OPA2227 is de-compensated and requires a minimum closed-loop gain of 5 for stability; for unity-gain applications, use the OPA2228 (identical except for compensation).","working_principle":"The OPA2227U uses a super-beta bipolar input stage with bias-current cancellation to achieve both low voltage noise (3 nV\/sqrt(Hz)) and relatively low input bias current. The super-beta transistors have a current gain (beta) approximately 10x higher than standard NPN transistors, reducing the base current and therefore the input bias current. The bias-current cancellation circuit uses a current mirror to inject a compensating current that cancels the base current of the input transistors. The de-compensated architecture reduces the internal compensation capacitor compared to a unity-gain-stable design, providing higher bandwidth (8 MHz GBW) and faster slew rate (2.5 V\/us) at the cost of requiring a minimum gain of 5 for stability. The low voltage noise is achieved through careful optimization of the input pair collector current and transistor geometry. The output stage uses a class AB push-pull configuration capable of driving 600 Ohm loads with low distortion.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>1OUT<\/td>Output<\/td>Channel 1 output<\/td><\/tr>
      2<\/td>1IN-<\/td>Input<\/td>Channel 1 inverting input<\/td><\/tr>
      3<\/td>1IN+<\/td>Input<\/td>Channel 1 non-inverting input<\/td><\/tr>
      4<\/td>VS-<\/td>Power<\/td>Negative supply<\/td><\/tr>
      5<\/td>2IN+<\/td>Input<\/td>Channel 2 non-inverting input<\/td><\/tr>
      6<\/td>2IN-<\/td>Input<\/td>Channel 2 inverting input<\/td><\/tr>
      7<\/td>2OUT<\/td>Output<\/td>Channel 2 output<\/td><\/tr>
      8<\/td>VS+<\/td>Power<\/td>Positive supply<\/td><\/tr><\/table>","application_scenarios":"
      • Dual-channel professional microphone preamp with 3nV noise floor<\/li>
      • Precision instrumentation amplifier with 114dB CMRR<\/li>
      • Phono cartridge RIAA equalizer with ultra-low noise<\/li>
      • 16-bit ADC driver with gain >= 5 for sensor conditioning<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>OPA2228U<\/td>SOIC-8<\/td>Unity-gain stable version<\/td><\/tr>
        TI<\/td>OPA227U<\/td>SOIC-8<\/td>Single version<\/td><\/tr>
        ADI<\/td>OP270FZ<\/td>SOIC-8<\/td>Dual low noise, similar class<\/td><\/tr>
        TI<\/td>OPA2134PA<\/td>DIP-8<\/td>JFET input, audio, lower noise<\/td><\/tr>
        TI<\/td>LM4562NA<\/td>DIP-8<\/td>2.7nV, audio op amp, unity stable<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6834","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=6834"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/posts\/6834\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/media?parent=6834"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/categories?post=6834"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/tags?post=6834"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/zh\/wp-json\/wp\/v2\/chip_brand?post=6834"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}