TD1836 from Techcode Semicon, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	BST	power_out	Bootstrap pin: a capacitor connected between SW and BS forms a floating supply that drives the power switch gate above the supply voltage, with BS to GND rated VSW - 0.3 V to VSW + 6 V.
2	GND	power_in	Ground and voltage reference for the regulated output, which requires special layout so this node is isolated from the D1 to C1 ground path to prevent switching current spikes from inducing noise.
3	FB	input	Feedback input that sets the output voltage through an external resistor divider to GND, and the frequency foldback comparator lowers the oscillator frequency when FB is below 300mV to prevent current-limit runaway during a short circuit.
4	EN	input	On/off input that must be pulled above 1.35V (EN rising threshold) to turn the device on, and can be connected to VIN through a 1MΩ resistor for automatic enable.
5	VIN	power_in	Supply input that operates from an 11V to 75V unregulated input per the pin description, requires C1 to prevent large input voltage spikes, and is rated -0.3 V to 80 V absolute maximum.
6	SW	output	Power switching output that is the drain of the internal N-channel power MOSFET supplying the output LC filter, with SW to GND rated -0.3 V to VIN + 0.3 V.

Key specifications

Parameter	Value
Manufacturer	Techcode Semicon
Package	SOT-23-6
Category	Power Management ICs
Pins	6

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Feedback Voltage	VFB	0.792	0.812	0.832	V	10V ≤ VIN ≤ 75V	4
Feedback Current	IFB			0.1	µA	VFB = 0.85V	4
Switch Leakage	ISW_LKG			1	µA	VEN=0V,VSW=0V	4
Oscillator Frequency	fSW	380	480	580	kHZ	VFB=0.6V	4
Under-Voltage Lockout Threshold, Rising	VUVLO_R		7.5	8.5	V		4
Supply Current (Shutdown)	IS		0.1	1	µA	VEN=0V	5
Supply Current (Quiescent)	IQ		0.73	0.85	mA	VEN=2V,VFB=1V	5
VIN Supply Voltage (VIN to Gnd)	VIN	-0.3		80	V		3
SW to GND Voltage	VSW	-0.3			V		3
BS to GND Voltage (printed as VSW - 0.3 to VSW + 6)	VBS	-0.3		6	V		3
All Other Pins		-0.3		6	V		3
Junction Temperature	TJ			150	ºC		3
Storage Temperature	TSTG	-65		150	ºC		3
Maximum Lead Soldering Temperature	TSDR			260	ºC	10 seconds	3
VIN Supply Voltage	VIN	11		75	V		4
Operating Junction Temperature		-40		125	oC		4
Junction-to-Ambient Resistance	θJA		250		°C/W	Resistance in free air (Note 2), SOT-23-6	4

CAD (KiCad official)

Symbol: TD1836
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)
3D model files: td1836-etched.step / td1836-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); td1836.step / td1836.glb are the bare package body.

Provenance

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

Datasheet: Techcode Semicon datasheet (8 pp, sha256 4947823a5dadb5ea, retrieved 2026-11-04, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF

TD1836

Verified TD1836

Verification log 1 record

3D Model

Symbol & Footprint

Schematic Symbol

PCB Footprint

Datasheet

README