A 250 mA low-dropout regulator built for battery-powered designs, in SOT-23. What sets it apart is its quiescent current: just 1.6 uA typical, so it barely drains a coin cell or Li-ion when the load is idle. It is offered in fixed output voltages (this page is the 3.3 V MCP1700-3302), holds good line and load regulation, and needs only small 1 uF ceramic input and output capacitors for stability. The dropout is modest for the class, so keep the input at least a couple hundred millivolts above the output at full load. Input up to 6 V.

Pinout

Pin	Name	Type	Function
1	GND	power_in	Regulator ground. Tie to the negative side of the output and input capacitors. Only the LDO bias current (1.6 µA typical) flows out of this pin; the LDO output regulation is referenced to this pin.
2	VOUT	power_out	Regulated output voltage (1.2 V to 5.0 V depending on ordering suffix). Connect to the positive side of the load and to the positive terminal of a 1 µF ceramic output capacitor. Delivers up to 250 mA (VR ≥ 2.5 V) or 200 mA (VR < 2.5 V).
3	VIN	power_in	Unregulated input supply voltage, 2.3 V to 6.0 V. Connect a 1 µF ceramic (or tantalum/aluminum electrolytic) input capacitor close to this pin to ensure stable LDO operation.

Key specifications

Parameter	Value
Type	Low-quiescent LDO regulator
Output current	250 mA
Quiescent current	1.6 µA typ
Output voltage	3.3 V (fixed, this variant)
Dropout	178 mV at 200 mA
Input voltage	2.3-6 V
Capacitors	1 µF ceramic in/out
Package	SOT-23 (3-lead)

Ordering variants

Same part, different packaging or reel option.

MCP1700T-3302E/TT (SOT-23, 3.3 V)
MCP1700-3002E/TO (TO-92, 3.0 V)

CAD (KiCad official)

Symbol: Regulator_Linear:MCP1700x-330xxTT
Footprint: Package_TO_SOT_SMD:SOT-23
3D model: SOT-23 (KiCad packages3D)

Provenance

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

Datasheet: Microchip Technology datasheet (30 pp, sha256 808bac85cf4d3fea, 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