Datasheet 3D Model

Q4435-BL Surface Mount

Flyback Regulator Transformer

For flyback regulator applications using LM258X SIMPLE SWITCHER^®
Recommended and approved by National Semiconductor
Custom versions available

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Count	Unit price
1	$5.83
250	$5.19
500	$4.34
1000	$3.62
2500	$3.02
5000	$2.43

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Typical Application

Works with Texas Instruments LM258X (T1)

Input Voltage	Output	Power	Fsw
4 V — 6 V	5 V , 1.6 A	8 W	100 kHz

Specifications

Electrical specifications at 25°C.

Part number (Hover for schematics)	Inductance at 0A (µH) (Tolerance: ±15%)	Inductance min at 4.85 A (µH)	DCR max 1		Leakage Inductance max (µH) 2	Turns Ratio	Volt-time product (V-µs)	Isolation Voltage (Vrms) 3
Part number (Hover for schematics)	Inductance at 0A (µH) (Tolerance: ±15%)	Inductance min at 4.85 A (µH)	Pri (Ω)	Sec (mΩ)	Leakage Inductance max (µH) 2	Pri : Sec	Volt-time product (V-µs)	Isolation Voltage (Vrms) 3
Q4435-BL	22	19	0.020	25.000	0.7	1 : 1	166.5	500

Notes

DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
Leakage inductance measured across the primary at 0.10 Vrms, 100 kHz.
500 Vrms isolation between windings.

Termination:

RoHS-compliant – 260°C compatible. Tin-silver over tin over copper clad steel.
COTS Plus tin-silver-copper and tin-lead terminations available.

Environmental

Environmental:

RoHS compliant

Ambient temperature range:

–40°C to +85°C

Storage temperature range:

Component: –40°C to +85°C
Tray packaging: –40°C to +80°C

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

See FIT/MTBF Calculations

Schematics

Physical characteristics

General specification

Core Material:

Ferrite

Weight:

9.0 g

Packaging:

42 parts per tray

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.

Recommended Pick & Place Nozzle:

......

PCB Washing:

Tested with pure water or alcohol only. More info.

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