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LDQ40 250mA Low-Dropout (LDO) Voltage Regulator

STMicroelectronics LDQ40 250mA Low-Dropout (LDO) Voltage Regulator is a high-accuracy voltage regulator that provides 250mA of current. It is available in a SOT23 5L, DFN 2x2 6L package to maximize space saving. The device is stabilized with a small ceramic capacitor on the output. The low drop, low quiescent current, and short-circuit protection make the LDQ40 suitable for low-power battery-operated applications.

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Select	Image	Part #	Mfr.	Description	Datasheet	Availability	Pricing (PEN) Filter the results in the table by unit price based on your quantity.	Qty.	RoHS	ECAD Model	Mounting Style	Package / Case	Output Voltage	Output Current	Number of Outputs	Polarity	Quiescent Current	Input Voltage, Min	Input Voltage, Max	PSRR / Ripple Rejection - Typ	Output Type	Minimum Operating Temperature	Maximum Operating Temperature	Dropout Voltage	Qualification	Series	Packaging
	LDO Voltage Regulators 250 mA low dropout LDO LDQ40PU33R STMicroelectronics 1: S/3.74 5,466In Stock New Product	Mfr. Part # LDQ40PU33R Mouser Part # 511-LDQ40PU33R New Product	STMicroelectronics	LDO Voltage Regulators 250 mA low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	5,466In Stock	Cut Tape S/3.74 S/2.68 S/2.42 S/2.13 Reel S/1.75 View S/1.99 S/1.91 S/1.85 S/1.71	Min.: 1 Mult.: 1 : 3,000				DFN-6	3.3 V	250 mA	1 Output	Positive	200 uA			60 dB	Fixed	- 40 C	+ 150 C	500 mV		LDQ40	Reel, Cut Tape
	LDO Voltage Regulators 250 mA low dropout LDO LDQ40PU50R STMicroelectronics 1: S/3.74 1,460In Stock New Product	Mfr. Part # LDQ40PU50R Mouser Part # 511-LDQ40PU50R New Product	STMicroelectronics	LDO Voltage Regulators 250 mA low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	1,460In Stock	Cut Tape S/3.74 S/2.68 S/2.42 S/2.13 Reel S/1.72 View S/1.99 S/1.91 S/1.85 S/1.70	Min.: 1 Mult.: 1 : 3,000				DFN-6	5 V	250 mA	1 Output	Positive	200 uA			60 dB	Fixed	- 40 C	+ 150 C	500 mV		LDQ40	Reel, Cut Tape
	LDO Voltage Regulators 250 mA low dropout LDO LDQ40PU25RY STMicroelectronics 1: S/4.13 2,989In Stock	Mfr. Part # LDQ40PU25RY Mouser Part # 511-LDQ40PU25RY	STMicroelectronics	LDO Voltage Regulators 250 mA low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	2,989In Stock	Cut Tape S/4.13 S/2.98 S/2.69 S/2.37 Reel S/1.93 View S/2.22 S/2.13 S/2.07 S/1.89 MouseReel Available	Min.: 1 Mult.: 1 : 3,000			SMD/SMT	DFN-6	5 V	250 mA	1 Output	Positive	90 uA			55 dB	Fixed	- 40 C	+ 150 C	500 mV	AEC-Q100	LDQ40	Reel, Cut Tape, MouseReel
	LDO Voltage Regulators 250 mA low dropout LDO LDQ40PU50RY STMicroelectronics 1: S/3.85 2,972In Stock	Mfr. Part # LDQ40PU50RY Mouser Part # 511-LDQ40PU50RY	STMicroelectronics	LDO Voltage Regulators 250 mA low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	2,972In Stock	Cut Tape S/3.85 S/2.82 S/2.57 S/2.29 Reel S/2.00 View S/2.22 S/2.13 S/2.11 S/1.87 MouseReel Available	Min.: 1 Mult.: 1 : 3,000			SMD/SMT	DFN-6	5 V	250 mA	1 Output	Positive	90 uA			55 dB	Fixed	- 40 C	+ 150 C	500 mV	AEC-Q100	LDQ40	Reel, Cut Tape, MouseReel
	LDO Voltage Regulators 250 mA Low dropout LDO LDQ40PUR STMicroelectronics 1: S/3.74 4,128In Stock	Mfr. Part # LDQ40PUR Mouser Part # 511-LDQ40PUR	STMicroelectronics	LDO Voltage Regulators 250 mA Low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	4,128In Stock	Cut Tape S/3.74 S/2.69 S/2.42 S/2.13 Reel S/1.79 View S/1.99 S/1.91 S/1.85 S/1.71 MouseReel Available	Min.: 1 Mult.: 1 : 3,000			SMD/SMT	DFN-6		200 mA	1 Output	Positive	2 uA			65 dB	Adjustable	- 40 C	+ 150 C	700 mV	AEC-Q100	LDQ40	Reel, Cut Tape, MouseReel
	LDO Voltage Regulators 250 mA low dropout LDO LDQ40PU18RY STMicroelectronics 1: S/3.97 2,558In Stock 3,000Expected 11/5/2026	Mfr. Part # LDQ40PU18RY Mouser Part # 511-LDQ40PU18RY	STMicroelectronics	LDO Voltage Regulators 250 mA low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	2,558In Stock 3,000Expected 11/5/2026	Cut Tape S/3.97 S/2.88 S/2.61 S/2.37 Reel S/1.94 View S/2.22 S/2.13 S/2.07 S/1.91 MouseReel Available	Min.: 1 Mult.: 1 : 3,000			SMD/SMT	DFN-6	5 V	250 mA	1 Output	Positive	90 uA			55 dB	Fixed	- 40 C	+ 150 C	500 mV	AEC-Q100	LDQ40	Reel, Cut Tape, MouseReel
	LDO Voltage Regulators 250 mA low dropout LDO LDQ40PU33RY STMicroelectronics 1: S/4.13 1,811In Stock 3,000Expected 10/19/2026	Mfr. Part # LDQ40PU33RY Mouser Part # 511-LDQ40PU33RY	STMicroelectronics	LDO Voltage Regulators 250 mA low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	1,811In Stock 3,000Expected 10/19/2026	Cut Tape S/4.13 S/2.98 S/2.69 S/2.37 Reel S/1.93 View S/2.22 S/2.13 S/2.07 S/1.90	Min.: 1 Mult.: 1 : 3,000			SMD/SMT	DFN-6	3.3 V	250 mA	1 Output	Positive	500 uA			55 dB	Fixed	- 40 C	+ 150 C	500 mV	AEC-Q100		Reel, Cut Tape
	LDO Voltage Regulators 250 mA Low dropout LDO LDQ40PURY STMicroelectronics 1: S/4.13 2,240In Stock	Mfr. Part # LDQ40PURY Mouser Part # 511-LDQ40PURY	STMicroelectronics	LDO Voltage Regulators 250 mA Low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	2,240In Stock	Cut Tape S/4.13 S/2.98 S/2.69 S/2.37 Reel S/1.93 View S/2.22 S/2.13 S/2.06 S/1.90 MouseReel Available	Min.: 1 Mult.: 1 : 3,000			SMD/SMT	DFN-6		200 mA	1 Output	Positive	2 uA			65 dB	Adjustable	- 40 C	+ 150 C	700 mV	AEC-Q100	LDQ40	Reel, Cut Tape, MouseReel