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Contents

Pinout
Key specifications
Electrical characteristics
CAD (KiCad official)
Provenance

README

markdown

MD75R33

Shanghai Mingda Microelectronics · Linear Voltage Regulators (LDO) · SOT-23-5

MD75R33 from Shanghai Mingda Microelectronics, in a SOT-23-5. 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	VDD	power_in	Power supply input; withstands up to 18V input while keeping the output regulated (absolute maximum 20V).
2	GND	power_in	Ground pin.
3	CE	input	Chip enable, active high; VCEH minimum 1.0V to operate and VCEL maximum 0.35V to shut down.
4	NC	unconnected	No connection; left floating.
5	VOUT	power_out	Regulated 3.3V output (±2%) for MD75R33, up to 120mA, with short-circuit current limited to about 160mA and requiring an output capacitor of 2.2µF or more.

Key specifications

Parameter	Value
Manufacturer	Shanghai Mingda Microelectronics
Package	SOT-23-5
Category	Power Management ICs
Pins	5

Electrical characteristics

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

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
Input voltage	VIN			20	V	Ta=25℃	2
Output voltage	VOUT	-0.3		0.3	V	Vss-0.3 ~ VIN+0.3V (min relative to Vss, max relative to VIN)	2
Power dissipation	PD			200	mW	SOT_23_5L	2
Operating ambient temperature	Topr	-40		85	℃		2
Storage temperature	Tstg	-40		125	℃		2
Output voltage	VOUT	3.234	3.3	3.366	V	VIN=5.3V, IOUT=10mA	2
Output current	IOUT	120	180		mA	VIN=4.3V	2
Dropout voltage	Vdrop		5		mV	IOUT=1 mA	2
Dropout voltage	Vdrop		250		mV	IOUT=50 mA	2
Line regulation	ΔVOUT/ΔVIN·VOUT		0.05	0.2	%/V	4.3V≤VIN≤18V, IOUT=1mA	2
Load regulation	ΔVOUT2		60	100	mV	VIN=4.3V, 1.0mA≤IOUT≤120mA	2
Output voltage temperature coefficient	ΔVOUT/ΔTa·VOUT		50	100	ppm/℃	VIN=4.3V, IOUT=10mA, -40℃≤Ta≤85℃	2
Supply current	ISS		1.2	5	uA	VIN=18V, no load	2
Standby current	ISS1		0.1	1	uA	VIN=18V, CE=GND, no load	2
CE pull-up current	ICEH		0.1	1	uA	VIN=VCE=VOUT+1V	2
CE input high level	VCEH	1			V		2
CE input low level	VCEL	0		0.35	V		2
Input voltage	Vmax			18	V		2
Output short-circuit current	Ishort		160		mA	Vout=0V	2
Input capacitor	CIN	1			µF	1.0 µF or more	5
Output capacitor	CL	2.2			µF	2.2 µF or more (tantalum); 10.0 µF or more (aluminum electrolytic)	5
Output capacitor ESR	ESR	0.5		5	Ω	appropriate ESR range	6

CAD (KiCad official)

Symbol: MD75R33
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)
3D model files: md75r33-etched.step / md75r33-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); md75r33.step / md75r33.glb are the bare package body.

Provenance

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

Datasheet: Shanghai Mingda Microelectronics datasheet (9 pp, sha256 f24bf1a24834dc74, retrieved 2026-10-23, tier: lcsc)
Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-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