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TOP221YN

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POWER INTEGRATIONS AC-DC Controllers And Regulators, TO-220. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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TOP221YN

POWER INTEGRATIONS · AC-DC Controllers And Regulators · TO-220

TOP221YN from POWER INTEGRATIONS, in a TO-220. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 CONTROL input Error amplifier and feedback current input for duty-cycle control; it also supplies the internal bias through a shunt regulator held at typically 5.7 V, and the bypass/auto-restart capacitor connects here (absolute maximum CONTROL voltage 9 V and current 100 mA).
2 SOURCE power_in Output MOSFET source connection for the high-voltage power return and the primary-side circuit common and reference point; the mounting tab is internally connected to this pin.
3 DRAIN output Output MOSFET drain connection that supplies start-up bias current through an internal switched high-voltage current source and serves as the internal current sense point; absolute maximum DRAIN voltage is -0.3 to 700 V.

Key specifications

Parameter Value
Manufacturer POWER INTEGRATIONS
Package TO-220
Category Power Management (PMIC)
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
DRAIN Voltage -0.3 700 V All voltages referenced to SOURCE, TA = 25 °C 10
CONTROL Voltage -0.3 9 V All voltages referenced to SOURCE, TA = 25 °C 10
CONTROL Current 100 mA 10
Storage Temperature -65 150 °C 10
Operating Junction Temperature -40 150 °C 10
Output Frequency fOSC 90 100 110 kHz See Figure 14; SOURCE = 0 V; TJ = -40 to 125 °C 10
Maximum Duty Cycle DMAX 64 67 70 % See Figure 14; SOURCE = 0 V; TJ = -40 to 125 °C 10
Minimum Duty Cycle DMIN 0.7 1.7 2.7 % See Figure 14; SOURCE = 0 V; TJ = -40 to 125 °C 10
PWM Gain -21 -16 -11 %/mA See Figure 14; SOURCE = 0 V; TJ = -40 to 125 °C 10
External Bias Current IB 0.8 2 3.3 mA See Figure 14; SOURCE = 0 V; TJ = -40 to 125 °C 10
Dynamic Impedance ZC 10 15 22 Ω See Figure 14; SOURCE = 0 V; TJ = -40 to 125 °C 10
Thermal Shutdown Temperature 125 135 °C 12
Power-up Reset Threshold Voltage VC(RESET) 2 3.3 4.3 V IC = 4 mA 12
ON-State Resistance (TOP221, TJ = 25 °C) RDS(ON) 31.2 36 Ω TJ = 25 °C 12
ON-State Resistance (TOP221, TJ = 100 °C) RDS(ON) 51.4 60 Ω ID = 25 mA, TJ = 100 °C 12
OFF-State Current IDSS 250 µA VDS = 560 V, TA = 125 °C 12
Breakdown Voltage BVDSS 700 V ID = 100 µA, TA = 25 °C 12
DRAIN Supply Voltage 36 V See Note C 13
Shunt Regulator Voltage VC(SHUNT) 5.5 5.7 6 V IC = 4 mA 13
Shunt Regulator Temperature Drift -50 50 ppm/°C 13
CONTROL Supply/Discharge Current (Output MOSFET Enabled, TOP221-224) ICD1 0.6 1.2 1.6 mA Output MOSFET enabled, TOP221-224 13
CONTROL Supply/Discharge Current (Output MOSFET Disabled) 0.5 0.8 1.1 mA Output MOSFET disabled 13
Auto-restart Duty Cycle 2 5 9 % See Figure 14; SOURCE = 0 V; TJ = -40 to 125 °C 11
Self-protection Current Limit (TOP221YN) ILIMIT 0.23 0.25 0.28 A di/dt = 40 mA/µs, TJ = 25 °C 11
PWM Gain Temperature Drift -0.05 %/mA/°C 10
Dynamic Impedance Temperature Drift 0.18 %/°C 10
Thermal Resistance, Junction to Ambient (Y package) θJA 70 °C/W Free standing with no heat sink 10
Thermal Resistance, Junction to Case (Y package) θJC 2 °C/W Measured at tab closest to plastic interface or SOURCE pin 10

CAD (KiCad official)

  • Symbol: TOP221YN
  • Footprint: Package_TO_SOT_THT:TO-220-3_Vertical
  • 3D model: TO-220 (KiCad packages3D, STEP)
  • 3D model files: top221yn-etched.step / top221yn-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); top221yn.step / top221yn.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: POWER INTEGRATIONS datasheet (20 pp, sha256 76d8469564658141, retrieved 2026-10-20, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF