3D Model Datasheet

HA3905 Flyback Transformer

for Microsemi PoE PD Power supply

Developed for use with Microsemi UC3844 Current Mode Controller and LX1752 Buck Regulator
T1 on PoE PD Power Supply Evaluation Board (AN-37)

Buy Now:

Count	Unit price
1	$2.20
175	$2.10
700	$1.75
1400	$1.46
2800	$1.28
5000	$1.11

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 Microsemi UC3844

Input Voltage	Output 1		Power	Fsw
Input Voltage	Sec	Aux	Power	Fsw
36 V — 57 V	5 V , 2.5 A	12 V , 0.02 A	12.5 W	200 kHz

Specifications

Electrical specifications at 25°C.

Part number 2 (Hover for schematics)	Inductance at 0A (µH) 3 (Tolerance: ±10%)	Inductance min at 1.2 A (µH)	DCR max (Ω)				Leakage Inductance max (µH) 4	Turns Ratio	Isolation Voltage (Vrms) 5
Part number 2 (Hover for schematics)	Inductance at 0A (µH) 3 (Tolerance: ±10%)	Inductance min at 1.2 A (µH)	Pri	Sec	Aux	Reset	Leakage Inductance max (µH) 4	Pri : Sec : Aux : Reset	Isolation Voltage (Vrms) 5
HA3905-CL_	27.0	24.3	0.170	0.015	0.385	0.371	1.9	1 : 0.267 : 0.735 : 1	1500

Notes

Output of the seconday is with the windings connected in parallel.
When ordering, please specify packaging code: HA3905-CLD.
Inductance is for the primary, measured at 250 kHz, 0.1 Vrms, 0 Adc.
Leakage inductance measured on the primary winding with all secondary pins shorted.
1500 Vrms,one minute isolation from primary, auxiliary and reset to secondary;
500 Vrms, one minute isolation from primary and reset to auxiliary

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 (175 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
175	330	100	13	38,4	32,4	32	28	4	2	12,93	0,5

General specification

Core Material:

Ferrite

Weight:

6.7 g

Packaging:

175 per 13″ reel Plastic tape: 32 mm wide, 0.5 mm thick, 28 mm pocket spacing, 12.93 mm pocket depth

Soldering/Washing

Moisture Sensitivity Level (MSL):

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

Resistance to soldering heat:

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

Refer to Soldering Coilcraft Components before soldering.

PCB Washing:

Only pure water or alcohol recommended

Warehouses

Language settings

Currency settings

HA3905 Flyback Transformer

for Microsemi PoE PD Power supply

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