TVS Diode Schottky Diode Rectifier Diode Light Emitting Diode Zener diode Varactor Diode Dual Common-Cathode Schottky Rectifier Bipolar Junction Transistor Triode for Alternating Current Silicon Controlled Rectifier Metal-Oxide-Semiconductor Field Effect Transistor Insulated Gate Bipolar Transistor Epitaxial Silicon Darlington Transistor Silicon Epitaxial Transistor DRAM SRAM Integrated Circuit Low-Dropout Regulator Y-Class Safety Capacitor X-Class Safety Capacitor Electrolytic Capacitor Solid-State Capacitor Tantalum MLCC Film Capacitors Supercapacitor Carbon Film Resistors Metal Film Resistors Metal Oxide Film Resistors Cement Resistors SMD Chip Resistors Variable Resistors Trimmer Resistors PTC Thermistor NTC Thermistor Photoresistors / LDR Varistors Resistor Network Resistor Pack Inrush Limiter Through-Hole Inductors Surface Mount Inductors Variable Inductor Common Mode Choke Toroidal Inductor Ceramic Resonators Crystal Oscillator / OSC / SPXO Crystal / XTAL Poly Fuse Fuse Slow-Blow Fuse SSR SPST SPDT DPST DPDT Reed Switch Wire to Power FPC Wire to Board Electronic module Ferrite Bead Transformer Photocoupler Bridge Rectifier Gas Discharge Tube Regulator Voltage Converter
X-None X-DR X-BR X-CR X-CA X-PCB X-GBJ X-GBU X-KBL X-KBU X-KBP X-KBPC X-MBF X-MBS X-ABS X-SMAF X-P600 AXIAL-0.3 AXIAL-0.4 AXIAL-0.5 AXIAL-0.6 AXIAL-0.7 AXIAL-0.8 AXIAL-0.9 AXIAL-1.0 AXIAL-1.1 AXIAL-1.2 AXIAL-1.3 AXIAL-1.4 AXIAL-1.5 SIP-5 SIP-6 SIP-7 SIP-8 SIP-9 SIP-10 SIP-12 DIP-4 DIP-6 DIP-7 DIP-8 DIP-10 DIP-12 DIP-14 DIP-16 DIP-18 DIP-20 DIP-22 DIP-24 DIP-28 DIP-32 DIP-36 DIP-40 DIP-48 DIP-52 DIP-64 DO-201AD DO-204AA DO-204AC DO-204AG DO-204AH DO-204AL DO-213 DO-214AA DO-214AC DO-214AB SOD-123 SOD-123FL SOD-323 SOD-523 TO-3P TO-126 TO-126F TO-3 TO-205AD TO-206AA TO-220AB TO-220AC TO-220-5 TO-220F TO-220F-2L TO-220F-5 TO-226AA TO-226AAS TO-226AAS-2 TO-226AAL TO-227 TO-247 TO-251 TO-252 TO-252-5 TO-262 TO-263 TO-264 SOT-23 SOT-23F SOT-23-5 SOT-23-6 SOT-89 SOT-143 SOT-223 SOT-323 SOT-343 SOT-363 SOT-416 SOT-416FL SOT-490 SOT-523 SOT-543 SOT-553 SOT-563 SOT-665 SOT-666 SOP-4 SOP-5 SOP-6 SOP-7 SOP-8 SOP-10 SOP-12 SOP-15 SOP-14 SOP-16 SOP-18 SOP-20 SOP-24 SOP-28 SOP-32 SOP-44 SOP-48 ESOP-12 MSOP-8 MSOP-10 MSOP-12 MSOP-14 MSOP-16 SSOP-8 SSOP-14 SSOP-16 SSOP-18 SSOP-20 SSOP-24 SSOP-28 SSOP-30 SSOP-32 TSOP-6 TSSOP-8 TSSOP-14 TSSOP-16 TSSOP-20 TSSOP-22 TSSOP-24 TSSOP-28 TSSOP-38 TSSOP-48 TSSOP-56 VSON-10 LCC-USP-6B CLCC-44 PLCC-4 PLCC-6 PLCC-20 PLCC-28 PLCC-32 PLCC-44 PLCC-52 PLCC-68 PLCC-84 ZIP-7 ZIP-11 ZIP-12 ZIP-15 ZIP-23 LGA-12 LGA-14 QFN-6 QFN-8 QFN-10 QFN-12 QFN-14 QFN-16 QFN-20 QFN-24 QFN-28 QFN-32 QFN-36 QFN-40 QFN-44 QFN-48 QFN-64 QFN-76 QFP-32 QFP-36 QFP-40 QFP-44 QFP-48 QFP-100 DFN-5x6-8 DFN-3x3-10 SMD-01005 SMD-0201 SMD-0402 SMD-0603 SMD-0805 SMD-1206 SMD-1210 SMD-1812 SMD-2010 SMD-2512 SMD-63×77 SMD-80×102 SMD-100x102 SMD-100×125 CON-Dupont CON-JST-XH CON-JST-SM CON-JST-SYP CON-JST-GH
Volatile Memory Non-Volatile Memory Microcontroller Unit Signal Processing Operational Amplifier Power Amplifier Analog Device Battery Management IC Power Management Regulator Rectifier Electronic Switch Power Driver Circuit Protect Fuse Electrical Isolation Noise Suppression Signal Level Shifting Resistor Capacitor Inductor Connector Switch
Package Marking Stock/Bin - TO-226AA 6821
SI6821
Type: BJT (Bipolar Junction Transistor)
Function: Electronic Switch
Series:
Alias: BUL6821,SI6821
Comp. Pair:
Manufacturer:
Equivalent Parts:
Semiconductor Type: NPN
Collector-Base Voltage VCBO : 600V
Collector-Emitter Voltage VCEO : 400V
Collector Current IC : 400mA Introduction : SI6821 高壓開關電晶體。正是歐系 BUL6821 之國產標準相容型號。
常見應用場景與電路特徵
• 市電高壓側開關。經常出現在 LED 驅動電源、手機充電器、節能燈電子安定器（Electronic Ballast） 的初級側（高壓側），負責將整流後的 110V/220V 直流高壓（約 150V–310V DC）進行高頻切換。
• 輔助啟動或驅動電路。在較大功率的電源供應器中，也可能用來驅動主開關管，或負責高壓啟動電路的穩壓切換。
Datasheet
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