{"id":6964,"date":"2026-06-22T03:17:05","date_gmt":"2026-06-22T03:17:05","guid":{"rendered":"https:\/\/materialparts.com\/buf634p\/"},"modified":"2026-06-22T03:17:05","modified_gmt":"2026-06-22T03:17:05","slug":"buf634p","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/buf634p\/","title":{"rendered":"BUF634P"},"content":{"rendered":"

\u0646\u0638\u0631\u0629 \u0639\u0627\u0645\u0629 \u0639\u0644\u0649 \u0627\u0644\u0645\u0646\u062a\u062c<\/h2>\n

The BUF634P from Texas Instruments (formerly Burr-Brown) is a 250mA high-speed open-loop buffer with 2000V\/us slew rate, pin-selectable 30-180MHz bandwidth, and 8-pin PDIP package.<\/p>\n

\u0627\u0644\u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0631\u0626\u064a\u0633\u064a\u0629<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u0627\u0644\u0646\u0648\u0639<\/td>\n250mA High-Speed Unity-Gain Open-Loop Buffer<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u0625\u062e\u0631\u0627\u062c<\/td>\n+\/-250 mA (continuous)<\/td>\n<\/tr>\n
\u0645\u0639\u062f\u0644 \u0627\u0644\u062f\u0648\u0631\u0627\u0646<\/td>\n2000 V\/us<\/td>\n<\/tr>\n
Bandwidth<\/td>\n30 MHz (low Iq mode) to 180 MHz (wide BW mode)<\/td>\n<\/tr>\n
Gain<\/td>\n0.99 V\/V @ RL=1kOhm; 0.93 @ RL=100Ohm (wide BW)<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0625\u0645\u062f\u0627\u062f<\/td>\n+\/-2.25V to +\/-18V (4.5V to 36V total)<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u0627\u0644\u062a\u0647\u062f\u0626\u0629<\/td>\n1.5 mA (low Iq, 30MHz BW); 15 mA (wide BW, 180MHz)<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0625\u0632\u0627\u062d\u0629 \u0627\u0644\u0645\u062f\u062e\u0644\u0627\u062a<\/td>\n+\/-30 mV (typical); +\/-100 mV (max)<\/td>\n<\/tr>\n
\u062a\u064a\u0627\u0631 \u062a\u062d\u064a\u0632 \u0627\u0644\u0625\u062f\u062e\u0627\u0644<\/td>\n+\/-0.5 uA (typical, low Iq); +\/-5 uA (max, wide BW)<\/td>\n<\/tr>\n
Short-Circuit Current<\/td>\n+\/-350 mA (typical, low Iq); +\/-550 mA (wide BW)<\/td>\n<\/tr>\n
Settling Time (0.1%)<\/td>\n200 ns @ 20V step, RL=100Ohm<\/td>\n<\/tr>\n
Thermal Shutdown<\/td>\n175C (typical)<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\n8-Pin PDIP (P suffix)<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-40C to +85C (specification); -40C to +125C (operating)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • 250mA continuous output current<\/li>\n
  • 2000V\/us slew rate<\/li>\n
  • Pin-selectable bandwidth: 30MHz (low Iq) to 180MHz (wide BW)<\/li>\n
  • Unity-gain open-loop buffer (can be used inside op-amp feedback)<\/li>\n
  • +\/-2.25V to +\/-18V wide supply range<\/li>\n
  • Internal current limit and thermal shutdown<\/li>\n
  • 8-Pin PDIP through-hole package<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Op-amp output current booster<\/li>\n
    • Capacitive load driver<\/li>\n
    • Headphone driver<\/li>\n
    • Coil\/cable driver<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The BUF634P from Texas Instruments (formerly Burr-Brown) is a 250mA high-speed open-loop buffer with 2000V\/us slew rate, pin-selectable 30-180MHz bandwidth, and 8-pin PDIP package. Key Specifications Type 250mA High-Speed Unity-Gain Open-Loop Buffer Output Current +\/-250 mA (continuous) Slew Rate 2000 V\/us Bandwidth 30 MHz (low Iq mode) to 180 MHz (wide BW mode) […]<\/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-6964","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-ti"],"acf":{"brief_explanation":"250mA Hi-Speed Buffer, 2000V\/us, 30-180MHz, PDIP-8","date_code":"","package_case":"8-Pin PDIP (9.81 x 6.35 x 5.08 mm, 2.54mm pitch)","in_stock":2345,"datasheet":"https:\/\/www.ti.com\/lit\/ds\/symlink\/buf634.pdf","price":"$6.50 @ 1ku","product_introduction":"The BUF634P from Texas Instruments (originally Burr-Brown) is a 250mA high-speed unity-gain open-loop buffer in an 8-pin PDIP through-hole package. The device is designed to be used inside the feedback loop of an op-amp to increase output current capability, eliminate thermal feedback, and improve capacitive load drive. In the low quiescent current mode (BW pin floating or connected to V- through a resistor), the BUF634 operates on 1.5mA with 30MHz bandwidth and 2000V\/us slew rate. In the wide bandwidth mode (BW pin connected directly to V-), the quiescent current increases to 15mA but the bandwidth extends to 180MHz. The 250mA continuous output current and 2000V\/us slew rate make the BUF634 ideal for driving heavy loads such as cables, transformers, and headphones while maintaining the precision of the driving op-amp. When placed inside the feedback loop of a precision op-amp, the op-amp's error correction eliminates the BUF634's 30mV typical input offset voltage, providing a composite amplifier with the op-amp's precision and the BUF634's output drive capability. The internal current limit and thermal shutdown protect the device from fault conditions. The P suffix indicates the 8-pin PDIP through-hole package.","working_principle":"The BUF634P is an open-loop unity-gain buffer with a complementary emitter-follower output stage. Unlike a closed-loop buffer, there is no internal feedback from output to input. The input signal drives the bases of complementary NPN and PNP transistors in a push-pull Class AB configuration. The output voltage follows the input voltage with a gain of approximately 0.99 (at light loads) due to the base-emitter voltage drops in the output stage. When used inside the feedback loop of an op-amp, the op-amp senses the buffer output (through its feedback network) and adjusts its own output to compensate for the buffer's gain error and offset voltage, resulting in a composite amplifier with unity gain accuracy set by the op-amp. The BW pin controls the bias current of the output stage. When the BW pin is open (or connected to V- through a resistor), the output stage is biased at low current (1.5mA total), providing 30MHz bandwidth with Class AB operation that minimizes crossover distortion. When the BW pin is shorted to V-, the bias current increases to 15mA, widening the bandwidth to 180MHz by increasing the speed of the output stage. The 2000V\/us slew rate is achieved by the large available current to charge the parasitic and load capacitances. The internal current limit operates by sensing the output current and reducing the drive to the output transistors when the current exceeds approximately 350mA (low Iq mode) or 550mA (wide BW mode). The thermal shutdown at 175C junction temperature disables the output stage to prevent damage.","pin_description":"
      Pin<\/th>Name<\/th>Type<\/th>Function<\/th><\/tr>
      1<\/td>BW<\/td>Input<\/td>Bandwidth select (float=open, tie to V-=wide BW)<\/td><\/tr>
      2<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr>
      3<\/td>VIN<\/td>Input<\/td>Signal input<\/td><\/tr>
      4<\/td>V-<\/td>Power<\/td>Negative supply<\/td><\/tr>
      5<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr>
      6<\/td>V+<\/td>Power<\/td>Positive supply<\/td><\/tr>
      7<\/td>VO<\/td>Output<\/td>Buffer output<\/td><\/tr>
      8<\/td>NC<\/td>-<\/td>No connect<\/td><\/tr><\/table>","application_scenarios":"
      • Composite amplifier with OPA627 + BUF634 inside feedback loop for precision audio headphone driver at +\/-15V, 250mA output<\/li>
      • Capacitive load driver using BUF634 inside OPA227 feedback loop to drive 0.1uF cable load with 2000V\/us slew rate<\/li>
      • Low-Iq instrumentation driver at 1.5mA quiescent with 30MHz bandwidth for portable test equipment cable driving<\/li><\/ul>","alternative_models":"
        Manufacturer<\/th>Part Number<\/th>Package<\/th>Notes<\/th><\/tr>
        TI<\/td>BUF634A<\/td>SOIC-8\/TO-220<\/td>Upgraded version, 210MHz, 3750V\/us<\/td><\/tr>
        TI<\/td>BUF634U<\/td>SOIC-8<\/td>SMD version, same function<\/td><\/tr>
        TI<\/td>BUF634T<\/td>TO-220-5<\/td>Power package, same die<\/td><\/tr>
        Analog Devices<\/td>ADA4870<\/td>PSOP-20<\/td>1A output, higher current<\/td><\/tr>
        TI<\/td>OPA549T<\/td>TO-220-8<\/td>8A power op-amp with buffer function<\/td><\/tr><\/table>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6964","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/comments?post=6964"}],"version-history":[{"count":0,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/6964\/revisions"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=6964"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=6964"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=6964"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=6964"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}