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DA2420-AL and DA2421-AL PoE Transformers

for ST Micro STE12PS

RoHS compliant
  • Developed for ST Microelectronics STE12PS 12-Channel PSE Power Controller
Buy Now:
Count Unit price
1 $2.10
175 $1.75
700 $1.46
1400 $1.22
2800 $1.06
5000 $0.92

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

. in stock, ready to ship today.
Request a Sample:

Typical Application

Works with STMicroelectronics STE12PS

Input Voltage Output Power Fsw
3.3 V 12 V , 0.1 A 1.2 W 330 kHz


Electrical specifications at 25°C.

Part number 1
(Hover for schematics)
at 0A (µH) 2
(Tolerance: ±10%)
min at   2 A (µH)
DCR max (Ω) 3 Leakage
max (µH) 4
Turns Ratio 5 Isolation
Voltage (Vrms) 6
Pri Sec Pri : Sec
DA2420-AL_ 330 297 0.408 5.920 6.0 1 : 2 500
DA2421-AL_ 330 297 0.459 14.150 4.8 1 : 3 500
  1. When ordering, please specify packaging code: e.g. DA2420-ALD
  2. Inductance is for the primary, measured at 100 kHz, 0.1 Vrms, 0 Adc.
  3. DCR measured at 25°C. For other operating temperatures, use this DCR at Temperature calculator.
  4. Leakage inductance measured on the primary windings with all secondary pins shorted.
  5. Turns ratio is with the primary windings connected in parallel.
  6. 500 Vdc isolation from primary to secondary.


  • RoHS-compliant. 260°C compatible. Tin-silver over tin over nickel over phos bronze terminations.


  • 13" reel, machine-ready 
    EIA-481 embossed plastic tape (175 parts per full reel).
  • B = Less than full reel
    In tape, but not machine-ready. To have a leader and trailer added ($25 charge), use code letter D instead.
RoHS compliant
Ambient temperature range:
−40°C to +125°C
Storage temperature range:
Component: −40°C to +125°C
Tape and reel packaging: −40°C to +80°C
Failures in Time (FIT) / Mean Time Between Failures (MTBF):



Primary windings to be connected
in parallel 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 da2420orientation.gif
175 330 100 13 50,4 44,4 44 32 4 2 11,9 0,4

General specification

14.1 – 14.6 g
175 per 13″ reel Plastic tape: 44 mm wide, 0.4 mm thick, 32 mm pocket spacing, 11.p mm pocket depth


Resistance to soldering heat:
Three reflows at >217°C for 90 seconds (+260°C ±5°C for 20 – 40 seconds), allowing parts to cool to room temperature between.
Refer to Soldering Coilcraft Components before soldering.

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