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STMicroelectronics ST1S09PUR — Discrete Semiconductors

STMicroelectronics ST1S09PUR Buck Regulator, 2A, 1.5MHz

MPNST1S09PUR
End of Life

STMicroelectronics ST1S09PUR, step-down (buck) switching regulator, adjustable output, 2 A, 1.5 MHz, synchronous rectifier, 6-VDFN exposed pad (3x3 mm), surface mount, Tape & Reel / Cut Tape.

$1.92Ref. price · indicative, final on quote
STMicroelectronics ST1S09PUR datasheet (PDF)
Packaging6-VDFN Exposed Pad
RoHSROHS3 Compliant
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

ST1S09PUR specifications
ParameterValue
Output typeAdjustable
MountingSurface Mount
Voltage - input2.7V
Voltage - output5.22V
Voltage - output (Min (Fixed))0.8V
Output current2A
Frequency1.5MHz
I/O channels1
Operating temperature-30°C ~ 85°C (TJ)
PackageTape & Reel (TR); Cut Tape (CT)
FunctionStep-Down
TopologyBuck
Case6-VDFN Exposed Pad
Output configurationPositive
Synchronous rectifierYes

Product details

Package and board-fit — 6-DFN with exposed pad

The ST1S09PUR: Operating temperature range is -30 °C to 85 °C junction — this is the commercial/industrial band; it will not survive an engine bay but is fine for indoor equipment, telecom cabinets, and portable devices. Available in Tape & Reel (standard 3000-piece reel) or Cut Tape for prototyping — the same order code covers both packaging options.

Compliance and sourcing posture

ROHS3 compliant (no exemptions for lead in solder or PBB/PBDE flame retardants), so it passes EU RoHS and similar restricted-material regulations without a waiver.

Frequently asked questions

Is ST1S09PUR RoHS compliant?

Yes, it is ROHS3 compliant, meaning it meets the latest EU RoHS restrictions without exemptions.

What is the difference between ST1S09PUR and ST1S09IPUR?

The ST1S09IPUR is the industrial-temperature variant of the same die — same 2 A output, same 1.5 MHz switching frequency, same 6-DFN package. For ambient-temperature designs below 85 °C, the PUR is functionally identical at a lower cost point.

How can I order ST1S09PUR or check current pricing?

Submit an RFQ for current pricing, lead time, and availability confirmation.