Datasheet 3D Model

Q4343-BL

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	$5.25
250	$4.33
500	$3.62
1000	$3.01
2500	$2.50
5000	$2.10

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Typical Application

Works with Texas Instruments LM258X (T3)

Input Voltage	Output		Power	Fsw
Input Voltage	Sec1	Sec2	Power	Fsw
18 V — 36 V	12 V , 1.4 A	12 V , 1.4 A	33.6 W	100 kHz

Specifications

Electrical specifications at 25°C.

Part number (Hover for schematics)	Inductance at 0A (µH) (Tolerance: ±15%)	Inductance min at 3 A (µH) 1	DCR max 2			Leakage Inductance max (µH) 3	Turns Ratio	Volt-time product (V-µs)	Isolation Voltage (Vrms) 4
Part number (Hover for schematics)	Inductance at 0A (µH) (Tolerance: ±15%)	Inductance min at 3 A (µH) 1	Pri (Ω)	Sec1 (mΩ)	Sec2 (mΩ)	Leakage Inductance max (µH) 3	Pri : Sec1 : Sec2	Volt-time product (V-µs)	Isolation Voltage (Vrms) 4
Q4343-BL	85.0	76.5	0.15	11.00	11.00	3.5	1 : 0.8 : 0.8	364.5	500

Notes

DC current at which the primary inductance is measured.
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 – Tin-silver over tin over copper.
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:

25.1 g

Packaging:

64 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.

PCB Washing:

Tested with pure water or alcohol only. More info.

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