{"id":7954,"date":"2026-06-28T06:10:16","date_gmt":"2026-06-28T06:10:16","guid":{"rendered":"https:\/\/materialparts.com\/tip122g\/"},"modified":"2026-06-28T11:37:45","modified_gmt":"2026-06-28T11:37:45","slug":"tip122g","status":"publish","type":"post","link":"https:\/\/materialparts.com\/ar\/tip122g\/","title":{"rendered":"TIP122G"},"content":{"rendered":"

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

The TIP122G from onsemi is an NPN Darlington power transistor with 100V collector-emitter voltage, 5A continuous collector current, and hFE of 1000 minimum, enabling direct drive from microcontroller logic in a TO-220 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
\u0627\u0644\u0646\u0648\u0639<\/td>\nNPN Darlington Power Transistor<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0645\u064f\u062c\u0645\u0650\u0651\u0639-\u0627\u0644\u0645\u0631\u0633\u0644 (VCEO)<\/td>\n100V<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0642\u0627\u0639\u062f\u0629 \u0627\u0644\u0645\u062c\u0645\u0639 - \u0627\u0644\u062c\u0647\u062f (VCBO)<\/td>\n100V<\/td>\n<\/tr>\n
\u062c\u0647\u062f \u0627\u0644\u0628\u0627\u0639\u062b-\u0627\u0644\u0642\u0627\u0639\u062f\u0629 (VEBO)<\/td>\n5V<\/td>\n<\/tr>\n
Collector Current (IC)<\/td>\n5A continuous; 8A peak<\/td>\n<\/tr>\n
Base Current (IB)<\/td>\n120mA max<\/td>\n<\/tr>\n
DC Current Gain (hFE)<\/td>\n1000 min @ IC=3A; 2500 typical @ IC=4A<\/td>\n<\/tr>\n
VCE(sat)<\/td>\n2.0V max @ IC=3A; 4.0V max @ IC=5A<\/td>\n<\/tr>\n
VBE(on)<\/td>\n2.5V max @ IC=3A<\/td>\n<\/tr>\n
\u062a\u0628\u062f\u064a\u062f \u0627\u0644\u0637\u0627\u0642\u0629<\/td>\n65W @ TC=25\u00b0C; 2W @ TA=25\u00b0C<\/td>\n<\/tr>\n
Thermal Resistance (\u03b8JC)<\/td>\n1.92\u00b0C\/W<\/td>\n<\/tr>\n
\u062f\u0631\u062c\u0629 \u062d\u0631\u0627\u0631\u0629 \u0627\u0644\u062a\u0634\u063a\u064a\u0644<\/td>\n-65\u00b0C to +150\u00b0C<\/td>\n<\/tr>\n
\u0627\u0644\u062d\u0632\u0645\u0629<\/td>\nTO-220AB (through-hole, tab=Collector)<\/td>\n<\/tr>\n<\/table>\n

\u0627\u0644\u0645\u064a\u0632\u0627\u062a<\/h2>\n
    \n
  • Darlington configuration \u2014 hFE = 1000 minimum<\/li>\n
  • 100V, 5A \u2014 medium-power switching<\/li>\n
  • Low base current: only 5mA to drive 5A load<\/li>\n
  • Built-in base-emitter shunt resistors for stability<\/li>\n
  • Monolithic construction<\/li>\n
  • Complementary PNP: TIP127G<\/li>\n<\/ul>\n

    \u0627\u0644\u062a\u0637\u0628\u064a\u0642\u0627\u062a<\/h2>\n
      \n
    • Relay and solenoid driver<\/li>\n
    • DC motor control<\/li>\n
    • High-power LED driver<\/li>\n
    • Heater control<\/li>\n
    • \u0645\u0631\u062d\u0644\u0629 \u0625\u062e\u0631\u0627\u062c \u0645\u0636\u062e\u0645 \u0627\u0644\u0635\u0648\u062a<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"

      Product Overview The TIP122G from onsemi is an NPN Darlington power transistor with 100V collector-emitter voltage, 5A continuous collector current, and hFE of 1000 minimum, enabling direct drive from microcontroller logic in a TO-220 package. Key Specifications Type NPN Darlington Power Transistor Collector-Emitter Voltage (VCEO) 100V Collector-Base Voltage (VCBO) 100V Emitter-Base Voltage (VEBO) 5V Collector […]<\/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":[144],"class_list":["post-7954","post","type-post","status-publish","format-standard","hentry","category-analog-linear-ics","category-integrated-circuits-ics","chip_brand-on"],"acf":{"brief_explanation":"NPN Darlington, 100V 5A, hFE 1000, TO-220, MCU-friendly","date_code":"","package_case":"TO-220AB (15.75 x 10.1 x 4.45mm, through-hole, tab=Collector)","in_stock":1550,"datasheet":"https:\/\/www.onsemi.com\/download\/data-sheet\/pdf\/tip120-d.pdf","price":"$0.262 @ 1ku","product_introduction":"The TIP122G from onsemi is an NPN Darlington power transistor containing two NPN transistors in a cascade (Darlington) configuration, plus built-in base-emitter shunt resistors for thermal stability. The Darlington connection multiplies the current gains of the two transistors: hFE(total) = hFE1 \u00d7 hFE2, resulting in a minimum gain of 1000 and typical gain of 2500. This enormous gain means that only IB = IC\/hFE = 5A\/1000 = 5mA of base current is needed to drive a 5A load \u2014 well within the output capability of any microcontroller GPIO. The trade-off is a high saturation voltage: VCE(sat) can reach 4V at 5A, meaning 20W of power dissipation in the transistor at full load. This requires a substantial heatsink for continuous operation. The 100V rating makes the TIP122 suitable for 12V, 24V, and even 48V systems. The complementary PNP device is the TIP127G. The G suffix denotes the Pb-free TO-220 package.","working_principle":"The TIP122G uses a Darlington pair: the collector of the first (input) transistor Q1 connects to the base of the second (output) transistor Q2, and both collectors tie together. When base current flows into Q1's base, Q1 amplifies it by hFE1 and feeds it to Q2's base. Q2 then amplifies this by hFE2. The total current gain is hFE1 \u00d7 hFE2 \u2248 1000-2500. The built-in shunt resistors (8k\u03a9 across Q1's B-E and 120\u03a9 across Q2's B-E) provide a leakage current path to prevent the Darlington from turning on due to collector leakage at high temperature. Without these resistors, Q1's collector leakage would be amplified by Q2, potentially causing thermal runaway. The saturation voltage is high (2-4V) because Q2's collector-emitter voltage can never fall below Q1's VCE(sat) + Q2's VBE \u2248 0.3V + 0.7V = 1.0V, and the shunt resistors divert some base current. The VBE(on) is also high (2.5V) because it's the sum of Q1's VBE + Q2's VBE \u2248 0.7V + 0.7V = 1.4V plus the drop across Q1's collector load. For switching applications, the base drive must supply IB = IC\/hFE(min) \u00d7 2 (overdrive) = IC\/500. For a 3A load: IB = 6mA. The base resistor: RB = (Vdrive \u2212 VBE(on)) \/ IB = (5V \u2212 2.5V) \/ 6mA \u2248 400\u03a9.","pin_description":"\n
      Pin<\/th>Name<\/th>Type<\/th>Description<\/th><\/tr>\n
      1<\/td>Base<\/td>Input<\/td>Base terminal controls the Darlington output. VBE(sat) is approximately 2.5V due to two series base-emitter junctions. Drive with IB > IC\/hFE(min) where hFE(min) = 1000 at IC=3A. Base current of 5-20mA is typically sufficient for full saturation at collector currents up to 5A.<\/td><\/tr>\n
      2<\/td>Collector<\/td>Power Output<\/td>Collector terminal connects to the load. Rated for 100V VCEO and 5A continuous collector current (8A peak). The tab of TO-220 is electrically connected to Collector. Power dissipation 65W at TC=25\u00b0C. VCE(sat) = 2.0V max at IC=3A due to Darlington configuration.<\/td><\/tr>\n
      3<\/td>Emitter<\/td>Output<\/td>Emitter terminal. Connects to ground in common-emitter configuration. Internal freewheeling diode (base-emitter resistors and protection diode) provides reverse voltage protection. Built-in base-emitter shunt resistors improve thermal stability and turn-off speed.<\/td><\/tr>\n<\/table>\n

      TIP122G pin assignment (TO-220-3, front view, pins down): Pin 1 (left) = Base, Pin 2 (center) = Collector\/Tab, Pin 3 (right) = Emitter. This is an NPN Darlington power transistor with minimum hFE of 1000, making it easy to drive from microcontroller GPIO. The tab is connected to Collector. Complementary PNP: TIP127G (-100V\/-5A). For MOSFET alternative with lower VCE(sat), consider IRF540N (100V\/33A logic-level MOSFET).<\/p>","application_scenarios":"

        \n
      • Motor Driver:<\/strong> MCU GPIO \u2192 220\u03a9 \u2192 TIP122 base; collector to 12V motor; emitter GND; flyback diode across motor; IB\u224810mA drives IC=3A<\/li>\n
      • Solenoid Control:<\/strong> 24V solenoid \u2192 TIP122 collector; emitter GND; IB=5mA from MCU; flyback diode essential<\/li>\n
      • Heater Element:<\/strong> 12V\/3A heater \u2192 TIP122 collector; PWM on base for temperature control; heatsink on TIP122<\/li>\n
      • High-Power LED:<\/strong> 12V LED strip (2A) \u2192 TIP122 collector; PWM base drive for dimming; 4.7k\u03a9 base resistor<\/li>\n
      • Audio Amp:<\/strong> Push-pull with TIP122 (NPN) + TIP127 (PNP); Class-AB; \u00b124V rails; 5A peak output<\/li>\n<\/ul>","alternative_models":"\n
        Model<\/th>Manufacturer<\/th>Key Difference<\/th>Package<\/th>Specs<\/th><\/tr>\n
        TIP120G<\/td>onsemi<\/td>60V version, same package, lower voltage<\/td>-<\/td>-<\/td><\/tr>\n
        TIP121G<\/td>onsemi<\/td>80V version, same package<\/td>-<\/td>-<\/td><\/tr>\n
        TIP127G<\/td>onsemi<\/td>PNP complementary (100V), same package<\/td>-<\/td>-<\/td><\/tr>\n
        BDW93C<\/td>Various<\/td>100V\/12A Darlington, higher current, TO-220<\/td>-<\/td>-<\/td><\/tr>\n
        IRF540NPBF<\/td>Infineon<\/td>MOSFET alternative, 100V\/33A, lower VCE(sat), needs gate driver<\/td>-<\/td>-<\/td><\/tr>\n<\/table>\n

        TIP122G is an NPN Darlington transistor 100V\/5A from onsemi in TO-220. The complementary PNP is TIP127G (-100V\/-5A). The TIP120G (60V) and TIP121G (80V) offer lower voltage ratings at identical current. The TIP142G provides 100V\/10A for higher current needs. The BD679A from ST offers 80V\/4A Darlington in SOT-93 for surface-mount. For MOSFET alternatives, IRLZ44N provides logic-level 55V\/47A N-channel switching. The FQP30N06L offers 60V\/30A with 35m\u03a9 RDS(on) for more efficient switching.<\/p>"},"_links":{"self":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7954","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=7954"}],"version-history":[{"count":1,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7954\/revisions"}],"predecessor-version":[{"id":8221,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/posts\/7954\/revisions\/8221"}],"wp:attachment":[{"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/media?parent=7954"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/categories?post=7954"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/tags?post=7954"},{"taxonomy":"chip_brand","embeddable":true,"href":"https:\/\/materialparts.com\/ar\/wp-json\/wp\/v2\/chip_brand?post=7954"}],"curies":[{"name":"\u062f\u0628\u0644\u064a\u0648 \u0628\u064a","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}