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PSSI2021SAY

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by Ray

Nexperia Current Source / Constant Current Source, SOT-353. Datasheet-verified pinout, KiCad symbol/footprint/3D.

componentpower management (pmic)pssi2021say
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3D Model

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Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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Contents

README

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PSSI2021SAY

Nexperia · Current Source / Constant Current Source · SOT-353

PSSI2021SAY from Nexperia, in a SOT-353. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 n.c. unconnected Not connected. Leave floating or tie to any convenient net; the pin has no internal bond.
2 IOUT output Regulated output current terminal. Sources a stabilized current (15 uA to 50 mA) into the load referenced to GND. Internal PNP collector; output voltage rating Vout = 73 V (with VS = 75 V).
3 GND power_in Ground / return terminal for the load current. All internal references are taken with respect to this pin.
4 REXT passive External resistor terminal used to program the output current. Connect a resistor Rext between REXT (pin 4) and VS (pin 5); Iout = 0.617/Rext + 15 uA. Left open, typical Iout is ~15 uA. Internal resistor value is ~48 kOhm.
5 VS power_in Supply voltage terminal. Absolute maximum VS = 75 V. Also serves as the reference node for the external programming resistor (Rext between pin 5 and pin 4).

Key specifications

Parameter Value
Manufacturer Nexperia
Package SOT-353
Category Power Management (PMIC)
Pins 5

Ordering variants

Same part, different packaging or reel option.

  • PSSI2021SAY

CAD (KiCad official)

  • Symbol: PSSI2021SAY
  • Footprint: Package_TO_SOT_SMD:SOT-353_SC-70-5
  • 3D model: SOT-353 (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: Nexperia datasheet (13 pp, sha256 403e1e89af407de3, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF