ICL7660M from HGSEMI, in a SOP-8. 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	No internal connection. Leave floating or tie to ground; no functional role in the charge-pump operation.
2	CAP+	passive	Positive terminal of the external flying (pump) capacitor C1 (typ. 10 µF). During the positive half-cycle, internal switches S1/S3 connect this pin to V+ to charge C1 up to V+.
3	GND	power_in	Device ground / negative supply return. Also the 0 V reference against which V+ (input) and VOUT (negative output) are measured.
4	CAP-	passive	Negative terminal of the external flying (pump) capacitor C1. During the negative half-cycle, internal switches S2/S4 connect this pin to VOUT so C1 transfers its charge into the reservoir capacitor at VOUT.
5	VOUT	power_out	Negative-voltage output. Delivers VOUT = -(V+); requires an external 10 µF reservoir capacitor to GND. Absolute-max range: GND to VOUT ≤ 9 V; typical ROUT ≈ 55 Ω at V+ = 5 V, IL = 20 mA, fOSC = 5 kHz.
6	LV	input	Low-voltage operation control input. Tie to GND when V+ ≤ 3.5 V to bypass the internal regulator and allow operation down to 1.5 V; leave floating (open) when V+ > 3.5 V. Max input current ILV = 20 µA.
7	OSC	bidirectional	Oscillator pin. Internally driven at ~10 kHz (typ.) with COSC = 1 pF, V+ = 5 V; may be tied to an external capacitor to lower fOSC or driven from an external clock/oscillator to override the internal timing. Oscillator source impedance ROSC ≈ 100 kΩ at V+ = 5 V (≈ 1 MΩ at V+ = 2 V).
8	V+	power_in	Positive supply input, 1.5 V to 9 V (absolute-max V+ to GND = 9 V). Bypass to GND with a 10 µF capacitor. Typical quiescent current IV+ ≈ 65 µA at V+ = 5 V, no load, OSC/LV open.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOP-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

ICL7660MM/TR
ICL7660MN
ICL7660MMM/TR
ICL7660MDQ3/TR

CAD (KiCad official)

Symbol: ICL7660M
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`icl7660m.step`	122 KB	You want the bare part, or you mark your own boards.
`icl7660m-etched.step`	1.7 MB	You want the part with `ICL7660M` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 421 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: HGSEMI datasheet (11 pp, sha256 f07266afe8919114, retrieved 2026-08-17, tier: lcsc)
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