SMPS Transformers

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Part	Manufacturer	Transformer Type	Mounting Feature	Approvals (V)	Terminal Finish	Power Rating	No. of Winding (Primary)	Isolation Voltage	Inductance (Primary)	Packing Method	Output Current-1	Minimum ET Product	Output Current-2	No. of Winding (Secondary)	Sub-Category	Dimensions	Maximum Operating Temperature	Application	Output Voltage-2	Output Voltage-1	Minimum Operating Temperature	Height	Width	Nominal Input Voltage (V)	Load Resistance	Additional Features	Minimum Input Voltage (V)	JESD-609 Code	Minimum Operating Frequency	Length	Turns Ratio (Np:Ns)	Maximum Operating Frequency	Maximum Input Voltage (V)
Q4337-BL	Coilcraft	SMPS TRANSFORMER	THROUGH HOLE MOUNT		Tin/Silver - Tin - with Nickel barrier		1	500 V	22 uH	TRAY				2	Other Transformers	L24.13XB20.96XH17.78 (mm)	85 Cel	POWER	12 V	12 V	-40 Cel	17.78 mm	20.96 mm				4			24.13 mm			6
Q4343-BL	Coilcraft	SMPS TRANSFORMER	THROUGH HOLE MOUNT		Tin/Silver (Sn/Ag) - Tin (Sn)		1	500 V	85 uH	TRAY				2	Other Transformers	L27.94XB27.94XH24.13 (mm)	85 Cel	POWER	12 V	12 V	-40 Cel	24.13 mm	27.94 mm				18			27.94 mm			36
Q4344-BL	Coilcraft	SMPS TRANSFORMER	THROUGH HOLE MOUNT		Tin/Silver (Sn/Ag) - Tin (Sn)		1	500 V	85 uH	TRAY				3	Other Transformers	L27.94XB27.94XH24.13 (mm)	85 Cel	POWER	5 V	12 V	-40 Cel	24.13 mm	27.94 mm				18			27.94 mm			36
Q4435-BL	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT		Tin/Silver (Sn/Ag) - Tin (Sn)		1	500 V	22 uH	TRAY				1	Other Transformers	L19.05XB18.62XH15.24 (mm)	85 Cel	POWER		5 V	-40 Cel	15.24 mm	18.62 mm				4			19.05 mm	1:1		6
Q4436-BL	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT		Tin/Silver (Sn/Ag) - Tin (Sn)		1	500 V	22 uH	TRAY				2	Other Transformers	L19.05XB18.62XH15.24 (mm)	85 Cel	POWER	12 V	12 V	-40 Cel	15.24 mm	18.62 mm				4			19.05 mm			6
Q4437-BL	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT		Tin/Silver (Sn/Ag) - Tin (Sn)		1	500 V	55 uH	TRAY	1.8 A	300 V-us	.25 A	3	Other Transformers	L19.05XB18.62XH15.24 (mm)	85 Cel	ISOLATION	5 V	12 V	-40 Cel	15.24 mm	18.62 mm				18			19.05 mm			36
Q4438-BL	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT		Tin/Silver (Sn/Ag) - Tin (Sn)		1	500 V	65 uH	TRAY	1.8 A	300 V-us	.25 A	2	Other Transformers	L19.05XB18.62XH15.24 (mm)	85 Cel	ISOLATION	12 V	12 V	-40 Cel	15.24 mm	18.62 mm		.15 ohm		18			19.05 mm	1:1.2		36
TA7818-AL	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT			51 W	2		24 uH	TRAY				3			125 Cel			12 V	-40 Cel	14.5 mm	26.75 mm			LENGTH AND HEIGHT DIMENSION INCLUDE TERMINAL ALSO, FLYBACK	36			32.65 mm		250 KHz	57
YA9167-BED	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT			12 W	2		4 uH	TR, EMBOSSED PLASTIC, 13 INCH				1			85 Cel			24 V	-40 Cel	11.79 mm	13.5 mm			LENGTH AND HEIGHT DIMENSION INCLUDE TERMINAL ALSO, FLYBACK	8		125 KHz	15.75 mm		150 KHz	28
YA9168-BED	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT			12 W	2		20 uH	TR, EMBOSSED PLASTIC, 13 INCH				2			85 Cel			5 V	-40 Cel	11.79 mm	13.5 mm			LENGTH AND HEIGHT DIMENSION INCLUDE TERMINAL ALSO, FLYBACK	18		125 KHz	15.75 mm		150 KHz	60
YA9169-BED	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT			12 W	2		20 uH	TR, EMBOSSED PLASTIC, 13 INCH				2			85 Cel			12 V	-40 Cel	11.79 mm	13.5 mm			LENGTH AND HEIGHT DIMENSION INCLUDE TERMINAL ALSO, FLYBACK	18		125 KHz	15.75 mm		150 KHz	60
YA9175-CED	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT			24 W	2		8.5 uH	TR, EMBOSSED PLASTIC, 13 INCH				1			85 Cel			12 V	-40 Cel	12.7 mm	13.7 mm			LENGTH AND HEIGHT DIMENSION INCLUDE TERMINAL ALSO, FLYBACK	18		100 KHz	17.7 mm		125 KHz	60
YA9293-ALD	Coilcraft	SMPS TRANSFORMER	SURFACE MOUNT	AEC-Q200			1		300 uH	TR, EMBOSSED PLASTIC, 13 INCH				1			125 Cel			24 V	-40 Cel	5.97 mm	10 mm			LENGTH AND HEIGHT DIMENSION INCLUDE TERMINAL ALSO, FLYBACK	4.5			12.07 mm			60
78250VC	Murata Manufacturing	SMPS TRANSFORMER	THROUGH HOLE MOUNT		MATTE TIN		1			TUBE				1								6.35 mm	9 mm					e3		9.52 mm
78253/35JC-R	Murata Manufacturing	SMPS TRANSFORMER	SURFACE MOUNT				1			TR				1								6.35 mm	9 mm							12.7 mm
78253/55MC	Murata Manufacturing	SMPS TRANSFORMER	SURFACE MOUNT		MATTE TIN	1 W	1		600 uH	TUBE				1		L9.52XB9.0XH6.35 (mm)	85 Cel			5 V	-40 Cel	6.35 mm	9 mm	5				e3		9.52 mm		500 KHz

SMPS Transformers

Switched-mode power supply (SMPS) transformers are a type of transformer used in power electronics to convert AC voltage to DC voltage with high efficiency. They are commonly used in applications such as computer power supplies, LED lighting, and motor drives.

The basic principle of an SMPS transformer is to use a high-frequency switching circuit to convert the input voltage to a high-frequency AC voltage, which is then rectified and filtered to produce the DC output voltage. The SMPS transformer is a critical component in the switching circuit, and is designed to handle high frequencies and high voltages without overheating or breaking down.

SMPS transformers are typically designed with a ferrite core, which has a high magnetic permeability and low magnetic losses at high frequencies. The core is usually in the form of a toroid, pot core, or E-core, and is wound with one or more coils to create the primary and secondary windings of the transformer.

The primary winding of the SMPS transformer is connected to the input AC voltage, while the secondary winding is connected to the rectifier and filter circuit, which produces the DC output voltage. The number of turns and the size of the wire used in the windings are determined by the required voltage transformation ratio and the frequency range of the circuit.