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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 (HKD) 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: HK$7.89 5,461In Stock New Product	Mfr. Part No. LDQ40PU33R Mouser Part No 511-LDQ40PU33R New Product	STMicroelectronics	LDO Voltage Regulators 250 mA low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	5,461In Stock	Cut Tape HK$7.89 HK$5.66 HK$5.10 HK$4.50 Reel HK$3.69 View HK$4.20 HK$4.03 HK$3.90 HK$3.61	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: HK$7.89 1,460In Stock New Product	Mfr. Part No. LDQ40PU50R Mouser Part No 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 HK$7.89 HK$5.66 HK$5.10 HK$4.50 Reel HK$3.64 View HK$4.20 HK$4.03 HK$3.90 HK$3.58	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: HK$8.71 2,989In Stock	Mfr. Part No. LDQ40PU25RY Mouser Part No 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 HK$8.71 HK$6.29 HK$5.68 HK$5.01 Reel HK$4.08 View HK$4.69 HK$4.50 HK$4.38 HK$3.99 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: HK$8.14 3,082In Stock	Mfr. Part No. LDQ40PU50RY Mouser Part No 511-LDQ40PU50RY	STMicroelectronics	LDO Voltage Regulators 250 mA low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	3,082In Stock	Cut Tape HK$8.14 HK$5.96 HK$5.43 HK$4.84 Reel HK$4.23 View HK$4.69 HK$4.50 HK$4.46 HK$3.95 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: HK$7.89 4,128In Stock	Mfr. Part No. LDQ40PUR Mouser Part No 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 HK$7.89 HK$5.67 HK$5.11 HK$4.50 Reel HK$3.77 View HK$4.21 HK$4.03 HK$3.90 HK$3.61 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: HK$8.38 2,558In Stock 3,000Expected 5/11/2026	Mfr. Part No. LDQ40PU18RY Mouser Part No 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 5/11/2026	Cut Tape HK$8.38 HK$6.08 HK$5.51 HK$5.01 Reel HK$4.10 View HK$4.69 HK$4.50 HK$4.38 HK$4.04 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: HK$8.71 1,809In Stock 3,000Expected 27/10/2026	Mfr. Part No. LDQ40PU33RY Mouser Part No 511-LDQ40PU33RY	STMicroelectronics	LDO Voltage Regulators 250 mA low dropout LDO Learn More about STMicroelectronics st ldq40 ldo voltage regulator	Datasheet	1,809In Stock 3,000Expected 27/10/2026	Cut Tape HK$8.71 HK$6.29 HK$5.68 HK$5.01 Reel HK$4.08 View HK$4.69 HK$4.50 HK$4.38 HK$4.01	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: HK$8.71 2,240In Stock	Mfr. Part No. LDQ40PURY Mouser Part No 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 HK$8.71 HK$6.29 HK$5.68 HK$5.01 Reel HK$4.08 View HK$4.69 HK$4.50 HK$4.34 HK$4.00 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