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Cx Family Common Mode Chokes
0402CT Low Profile Chip Inductors
XAL7050 High-inductance Shielded Power Inductors
XGL4020 Ultra-low DCR Power Inductors


RoHS compliant

For more information and specification about the part.

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Count Unit price
1 $3.79
350 $3.03
700 $1.82
1400 $1.49
2800 $1.21
5000 $1.11

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

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Typical Application

Works with no-opto flyback applications

Input Voltage Output Power Fsw
8 V 28 V 5 V , 1.2 A 6 W 150 kHz


Electrical specifications at 25°C.

8 – 28 V input

Part number
(Hover for schematics)
at 0A (µH) 1
(Tolerance: ±10%)
Isat (A) 2 DCR max (Ω) Leakage
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
  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.


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


  • 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).
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):
38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332

Performance curves

L vs Current

L vs Current


YA9124, YA9125, YA9127, YA9128*

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

YA9123, YA9126**

**Connect pin 1 to 2, 3 to 4, 5 to 6, and pin 7 to 8 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 part_or_c.gif
300 330 100 13 30,4 24,4 24 16 4 2 10,35 0,5

General specification

Core Material:
2.65 – 2.75 g
350/13″ reel Plastic tape: 24 mm wide, 0.50 mm thick, 16 mm pocket spacing, 10.35 mm pocket depth


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.

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