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Q4344-BL

Flyback Regulator Transformer

RoHS compliant
  • For flyback regulator applications using LM258X SIMPLE SWITCHER®
  • Recommended and approved by National Semiconductor
  • Custom versions available
Buy Now:
Count Unit price
1 $6.49
250 $5.65
500 $3.55
1000 $3.07
2500 $2.67
5000 $2.32

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

. in stock, ready to ship today.
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Typical Application

Works with Texas Instruments LM258X (T4)

Input Voltage Output Power Fsw
Sec1 Sec2 Sec3
18 V 36 V 12 V , 0.75 A 12 V , 0.75 A 5 V , 3 A 33 W 100 kHz

Specifications

Electrical specifications at 25°C.

Part number Inductance
at 0A (µH)
(Tolerance: ±15%)
Inductance
min at   3 A (µH)
DCR max (Ω) 1 Leakage
Inductance
max (µH) 2
Turns Ratio Volt-time
product (V-µs)
Isolation
Voltage (Vrms) 3
Pri Sec1 Sec2 Sec3 Pri : Sec1 : Sec2 : Sec3
Q4344-BL 85.0 76.5 0.145 0.200 0.200 0.030 3.5 1 : 0.8 : 0.8 : 0.35 364.5 500
Notes
  1. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
  2. Leakage inductance measured across the primary at 0.10 Vrms, 100 kHz.
  3. 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):
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332

Schematics

q4344s.gif

Physical characteristics

lm258l2d.gif

General specification

Core Material:
Ferrite
Weight:
23.1 g
Packaging:
30 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.