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Close up of YA912x
Datasheet

No-Opto Flyback Transformers

RoHS compliant
  • Discontinuous conduction mode Flyback transformers
  • Optimized for 125 – 150 kHz with 8 – 28 V or 18 – 60 V input
  • 1500 Vrms, one minute isolation between primary and secondary

Buy Now:
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Count Unit price
1 $4.02
350 $3.45
700 $2.07
1400 $1.70
2800 $1.38
5000 $1.27

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

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Typical Application

Works with flyback applications

Part number Input Voltage Output Power Fsw
YA9123-BED 8 V — 28 V 5 V , 1.2 A 6 W 150 kHz
YA9124-BED 8 V — 28 V 12 V , 0.5 A 6 W 150 kHz
YA9125-BED 8 V — 28 V 24 V , 0.25 A 6 W 150 kHz
YA9126-BED 18 V — 60 V 5 V , 1.2 A 6 W 150 kHz
YA9127-BED 18 V — 60 V 12 V , 0.5 A 6 W 150 kHz
YA9128-BED 18 V — 60 V 24 V , 0.25 A 6 W 150 kHz

Specifications

Electrical specifications at 25°C.

8 – 28 V input

Part number
(Hover for schematics)
Inductance
at 0A (µH) 1
(Tolerance: ±10%) 		Isat (A) 2 DCR max (Ω) Leakage
Inductance
max (µH) 3 		Turns Ratio Isolation
Voltage (Vrms) 4
Pri Sec Pri : Sec
YA9123-BED 8.0 5.9 0.025 0.024 0.124 1 : 0.751 1500
YA9124-BED 8.0 5.9 0.025 0.125 0.124 1 : 1.625 1500
YA9125-BED 8.0 5.9 0.025 0.306 0.100 1 : 3.125 1500

18 – 60 V input

Part number
(Hover for schematics)
Inductance
at 0A (µH) 1
(Tolerance: ±10%) 		Isat (A) 2 DCR max (Ω) Leakage
Inductance
max (µH) 3 		Turns Ratio Isolation
Voltage (Vrms) 4
Pri Sec Pri : Sec
YA9126-BED 40 2.3 0.095 0.020 0.460 1 : 0.313 1500
YA9127-BED 40 2.3 0.095 0.090 0.353 1 : 0.75 1500
YA9128-BED 40 2.3 0.095 0.260 0.350 1 : 1.375 1500
Notes
  1. Inductance is for the primary, measured at 150 kHz, 0.1 Vrms, 0 Adc.
  2. Isat: DC current that causes the primary inductance drop of 30% (typ) from its value without current.
  3. Leakage inductance is for the primary winding with the secondary windings shorted.
  4. Isolation (hipot) measured between windings for one minute.

Termination:

  • RoHS-compliant. 260°C compatible. Tin-silver-copper over tin over nickel over phos bronzes.

Packaging:

  • D = 13″ machine-ready reel. EIA-481 embossed plastic tape (350 parts per full reel). Quantities less than full reel available: in tape (not machine ready) or with leader and trailer ($25 charge).
Environmental
Environmental:
RoHS compliant
Ambient temperature range:
−40°C to +85°C
Storage temperature range:
Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
Maximum part temperature:
+125°C (Ambient + temperature rise)
Failures in Time (FIT) / Mean Time Between Failures (MTBF):
See FIT/MTBF Calculations

Performance curves

L vs Current

L vs Current
YA9123, YA9124, YA9125

L vs Current

L vs Current
YA9126, YA9127, YA9128

Schematics

YA9124, YA9125, YA9127, YA9128*

ya912xs.gif 
*Connect pin 1 to 2 and pin 3 to 4 on the PC board
 

YA9123, YA9126**

ya9123s.gif
**Connect pin 1 to 2, 3 to 4, 5 to 6, and pin 7 to 8 on the PC board

Physical characteristics

ya912xd.gif

dims_inches_mm.gif

Tape and Reel specification

tapereel_pl.gif
 
Parts per reel Reel dimensions (mm) Tape dimensions (mm) Orientation
13" (330 mm) A B C D E W P Po P1 H T part_or_c.gif
300 330 100 13 30,4 24,4 24 16 4 2 10,35 0,5

General specification

Core Material:
Ferrite
Weight:
2.65 – 2.75 g
Packaging:
350/13″ reel Plastic tape: 24 mm wide, 0.50 mm thick, 16 mm pocket spacing, 10.35 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 to MIL-STD-202 Method 215 plus an additional aqueous wash. More info.