L6561D013TR from STMicroelectronics, in a SOIC-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	INV	input	Inverting input of the error amplifier. A resistive divider from the regulated output voltage connects to this pin to provide voltage feedback. Internal reference is 2.5V (±1% at Tj=25°C); input bias current typ. -0.1µA.
2	COMP	output	Output of the error amplifier. A feedback compensation network is placed between this pin and INV (pin 1). Upper clamp ~5.8V, lower clamp ~2.25V; source current typ. -4mA, sink typ. 4.5mA. Also carries the OVP triggering current (typ. 40µA).
3	MULT	input	Input of the multiplier stage. A resistive divider from the rectified mains connects to this pin, producing a voltage proportional to the rectified mains. Linear operating range 0 to 3V (typ. to 3.5V); multiplier gain K ≈ 0.6 1/V.
4	CS	input	Current sense input to the PWM comparator. Inductor current is sensed by an external resistor whose voltage is applied here. Internal reference clamp ~1.7V; input bias typ. -0.05µA; delay to output typ. 200ns. Absolute max -0.3 to 7V.
5	ZCD	input	Zero current detection input. Sensed from an auxiliary transformer winding to detect boost inductor demagnetization. Rising threshold typ. 2.1V, hysteresis typ. 0.5V. Grounding this pin (V < ~200mV disable threshold) disables the device. Upper clamp ~5.1V, lower clamp ~0.65V; abs. max 50mA source / -10mA sink.
6	GND	power_in	Ground reference / current return for driver and control circuits.
7	GD	output	Gate driver output. Push-pull totem-pole output capable of driving a Power MOSFET or IGBT with ±400mA peak (±700mA for 2µs abs. max). Rise/fall time typ. 40ns into 1nF load. Output actively pulled low (typ. 10mA) when VCC < UVLO.
8	VCC	power_in	Supply voltage for driver and control circuits. Operating range 11V to 18V (after turn-on); turn-on threshold typ. 12V, turn-off typ. 9.5V (hysteresis ~2.5V). Start-up current typ. 50µA, quiescent typ. 2.6mA, operating typ. 4mA. Internal 20V zener clamp; abs. max supply current 30mA.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SOIC-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

L6561D013TR
L6561D013TRD

CAD (KiCad official)

Symbol: L6561D013TR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: STMicroelectronics datasheet (None pp, sha256 2be94714d796d4fb, 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