SG2525M from HGSEMI, in a SOP-16. 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	Inv. Input	input	Inverting input of the internal error amplifier. Typical input offset 1.5 mV, input bias current 1 µA, common-mode range 1.5 to 5.2 V.
2	Noninv. Input	input	Non-inverting input of the internal error amplifier. Common-mode input range 1.5 V to 5.2 V; typically tied to VREF (5.1 V) via a divider for voltage-mode regulation.
3	Sync	bidirectional	Oscillator synchronization pin, active-low. Sync threshold 1.2-2.8 V (typ 2 V); sync input current ~1.3 mA at 3.5 V. Allows master/slave operation or synchronization to an external clock.
4	OSC. Output	output	Oscillator clock output. Clock amplitude 3-4 V (typ), pulse width 0.3-1 µs at TJ=25 °C. Available to drive external logic or provide sync to other SG2525/SG3525 devices.
5	CT	passive	Timing capacitor connection. Together with RT sets the oscillator frequency (100 Hz to 500 kHz range; e.g. RT=2 kΩ, CT=470 pF → ~430 kHz; RT=200 kΩ, CT=0.1 µF → ~60 Hz).
6	RT	passive	Timing resistor connection. Sets oscillator charging current; combined with CT determines the oscillator frequency.
7	Discharge	passive	Discharge pin for the timing capacitor. A resistor between CT (pin 5) and Discharge (pin 7) programs the dead time between the two outputs.
8	Soft-Start	passive	Soft-start capacitor pin (C_Soft-Start). Charged by an internal ~51 µA current source to gradually ramp the PWM duty cycle at start-up.
9	Compensation	output	Error-amplifier output / PWM comparator input. Used for loop compensation; PWM input threshold 0.7-0.9 V (0% duty) up to ~3.2-3.6 V (max duty ~49%).
10	Shutdown	input	Active-high shutdown input. Threshold 0.6-1.0 V (typ 0.8 V); drives both outputs low and discharges the soft-start capacitor for cycle-by-cycle pulse termination or full shutdown.
11	Output A	output	Totem-pole PWM output A. Source/sink capability >150 mA (peak 400 mA); VOH ≥17 V at 100 mA source (VCC=20 V), VOL ≤2 V at 100 mA sink. Alternates with Output B at half the oscillator frequency.
12	Ground	power_in	Signal and power ground return for the device.
13	VC	power_in	Output-stage collector supply for the totem-pole drivers. Maximum 40 V; typically bypassed to ground with 0.1 µF close to the pin. Allows the output stage to be powered separately from VCC.
14	Output B	output	Totem-pole PWM output B. Complementary to Output A; source/sink >150 mA. Push-pull pair drives external power switches or transformer primaries.
15	VCC	power_in	Main supply input. Operating range 8-35 V (absolute max 40 V); typical ICC ~12 mA at VCC=35 V. UVLO threshold ~7 V with hysteresis. Bypass with 0.1 µF close to the pin.
16	Vref	power_out	5.1 V ±1% internal reference output. Load capability up to 20 mA (short-circuit ~80 mA); line/load/temperature guaranteed 4.95-5.25 V. Bypass with 0.1 µF to ground.

Key specifications

Parameter	Value
Manufacturer	HGSEMI
Package	SOP-16
Category	PMIC
Pins	16

Ordering variants

Same part, different packaging or reel option.

SG2525MM/TR
SG2525MN
SG2525MMT/TR

CAD (KiCad official)

Symbol: SG2525M
Footprint: Package_SO:SOIC-16_3.9x9.9mm_P1.27mm
3D model: SOP-16 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`sg2525m.step`	217 KB	You want the bare part, or you mark your own boards.
`sg2525m-etched.step`	2.3 MB	You want the part with `SG2525M` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 554 faces against 267 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 (9 pp, sha256 257c81ee012cd504, 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