3D Model Datasheet

GA3429-BL Flyback Transformer

for Linear Technology LT3573

Developed for Linear Technology LT3573 Isolated Flyback Converter
Can also be used in PoE applications
Bias winding provides power to the chipset

Buy Now:

Count	Unit price
1	$3.42
250	$2.92
500	$2.55
1000	$2.00
2500	$1.71
5000	$1.56

For high volume or non-stock items, request a quote.

Packaging

D = 13" machine-ready reel

. in stock, ready to ship today.

Request a Sample:

Typical Application

Works with Analog Devices LT3573

Input Voltage	Output 1		Power	Fsw
Input Voltage	Sec	Bias	Power	Fsw
20 V — 28 V	3.3 V , 1.5 A	3.3 V , 0.02 A	5 W	250 kHz

Specifications

Electrical specifications at 25°C.

Part number 2 (Hover for schematics)	Inductance at 0A (µH) 3 (Tolerance: ±10%)	Inductance min at 2.1 A (µH)	DCR max (mΩ) 4			Leakage Inductance max (µH) 5	Turns Ratio 6	Isolation Voltage (Vrms) 7
Part number 2 (Hover for schematics)	Inductance at 0A (µH) 3 (Tolerance: ±10%)	Inductance min at 2.1 A (µH)	Pri	Sec	Bias	Leakage Inductance max (µH) 5	Pri : Sec : Bias	Isolation Voltage (Vrms) 7
GA3429-BL_	24.0	21.6	95.0	7.5	123	0.566	1 : 0.25 : 0.25	1500

Notes

Output is with the secondary windings connected in parallel. Bias winding output: 3.3 V, 20 mA.
When ordering, please specify packaging code: GA3429-BLD.
Inductance is for the primary, measured at 250 kHz, 0.3 Vrms, 0 Adc.
DCR for the secondary is per winding.
Leakage inductance measured between pins 3 and 4 with all secondary pins shorted.
Turns ratio is with the secondary windings connected in parallel.
1500 Vrms isolation from primary and bias to secondary;
500 Vrms isolation from primary to bias, tested for one minute.

Termination:

RoHS-compliant. 260°C compatible. Tin-silver (96.5/3.5) over tin over nickel over phos bronze terminations. Other terminations available at additional cost.

Packaging:

D = 13″ machine-ready reel. EIA-481 embossed plastic tape (250 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
B = Less than full reel. In an effort to simplify our part numbering system, Coilcraft is eliminating the need for multiple packaging codes. When ordering, simply change the last letter of your part number from B to D.

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

–40°C to +85°C

Storage temperature range:

Component: –40°C to +85°C.
Tape and reel packaging: –40°C to +80°C

Failures in Time (FIT) / Mean Time Between Failures (MTBF):

See FIT/MTBF Calculations

Schematics

Secondary windings to be connected
in parallel on the PC board

Physical characteristics

Tape and Reel specification

Parts per reel	Reel dimensions (mm)					Tape dimensions (mm)						Orientation
13" (330 mm)	A	B	C	D	E	W	P	Po	P1	H	T
250	330	100	13	38,4	32,4	32	20	4	2	11,2	0,5

General specification

Core Material:

Ferrite

Weight:

3.9 to 4.1 g

Packaging:

250 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 20 mm pocket spacing, 11.2 mm pocket depth.

Soldering/Washing

Moisture Sensitivity Level (MSL):

1 (unlimited floor life at <30°C / 85% relative humidity)

Resistance to soldering heat:

Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles

Refer to Soldering Coilcraft Components before soldering.

PCB Washing:

Tested with pure water or alcohol only. For other solvents, see Doc787_PCB_Washing.pdf

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GA3429-BL Flyback Transformer

for Linear Technology LT3573

Selected configuration not available

Typical Application

Specifications

Termination:

Packaging:

Schematics

Physical characteristics

Tape and Reel specification

General specification

Soldering/Washing

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Warning