WE-OLEFD Offline Transformer
SizeDimen­sions3DL
(mm)
W
(mm)
H
(mm)
Mount
EFD20 THT
21.5 29 12 THT
EFD20 SMT
21.5 33.8 12 SMT
EFD25 THT
26.3 33 - THT

Characteristics

  • Universal input voltage from 85VAC up to 265VAC
  • Switching frequency: 68kHz to 250kHz
  • Low Profile
  • Insulation test voltage: 4500VAC
  • Operating temp: -40°C to +125°C
  • Designed for IEC61558-2-16 reinforced 400VDC working voltage

Applications

  • SMPS with power up to 34W
  • Auxiliary power supplies
  • Power electronics
  • White goods
  • LED lighting

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Products

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EFD20 THT
EFD20 SMT
EFD25 THT
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Order Code
Data­sheet
Simu­lation
Downloads
Status
VIN
VOut1(V)
IOut1(A)
VOut2(V)
IOut2(A)
VOut3(V)
IOut3(A)
Vaux(V)
Vaux 2(V)
Vaux 1(V)
fswitch(kHz)
L(µH)
NPRI : NSEC : NAUX
ISAT(A)
VT(V (AC))
L(mm)
W(mm)
H(mm)
Mount
Size
Samples
WE-OLEFD Offline Transformer
750811612
85 - 265 V (AC), 5 V, 1.3 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 15 V
Output Current 11.3 A
Output Voltage 25 V
Output Current 21.3 A
Auxiliary Voltage20 V
Switching Frequency 68 - 110
Inductance800 µH
Turns Ratio5.26:0.26:0.26:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width29 mm
Height12 mm
MountTHT 
SizeEFD20 
WE-OLEFD Offline Transformer
7508116313
85 - 265 V (AC), 12 V, 0.85 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 112 V
Output Current 10.85 A
Output Voltage 212 V
Output Current 20.85 A
Auxiliary Voltage20 V
Switching Frequency 68 - 110
Inductance800 µH
Turns Ratio9.09:0.27:1.18:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width29 mm
Height12 mm
MountTHT 
SizeEFD20 
WE-OLEFD Offline Transformer
750811644
85 - 265 V (AC), 24 V, 0.4 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 124 V
Output Current 10.4 A
Output Voltage 224 V
Output Current 20.4 A
Auxiliary Voltage20 V
Switching Frequency 68 - 150
Inductance800 µH
Turns Ratio11.11:1.88:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width29 mm
Height12 mm
MountTHT 
SizeEFD20 
WE-OLEFD Offline Transformer
7508112330
85 - 265 V (AC), 16 V, 1.15 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 116 V
Output Current 11.15 A
Auxiliary Voltage20 V
Switching Frequency 68 - 130
Inductance800 µH
Turns Ratio8.333:1:1.25 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width29 mm
Height12 mm
MountTHT 
SizeEFD20 
WE-OLEFD Offline Transformer
7508112512
85 - 265 V (AC), 32 V, 0.75 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 132 V
Output Current 10.75 A
Auxiliary Voltage20 V
Switching Frequency 68 - 170
Inductance800 µH
Turns Ratio11.11:1.55:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width29 mm
Height12 mm
MountTHT 
SizeEFD20 
WE-OLEFD Offline Transformer
7508112513
85 - 265 V (AC), 40 V, 0.58 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 140 V
Output Current 10.58 A
Auxiliary Voltage20 V
Switching Frequency 68 - 180
Inductance800 µH
Turns Ratio6.66:0.8:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width29 mm
Height12 mm
MountTHT 
SizeEFD20 
WE-OLEFD Offline Transformer
750811613
85 - 265 V (AC), 5 V, 1.8 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 15 V
Output Current 11.8 A
Output Voltage 212 V
Output Current 20.9 A
Auxiliary Voltage20 V
Switching Frequency 68 - 170
Inductance800 µH
Turns Ratio6.66:0.6:0.6:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width29 mm
Height12 mm
MountTHT 
SizeEFD20 
WE-OLEFD Offline Transformer
750811614
85 - 265 V (AC), 5 V, 1.2 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 15 V
Output Current 11.2 A
Output Voltage 224 V
Output Current 20.62 A
Auxiliary Voltage20 V
Switching Frequency 68 - 220
Inductance800 µH
Turns Ratio8.33:1.16:1.16:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width29 mm
Height12 mm
MountTHT 
SizeEFD20 
WE-OLEFD Offline Transformer
750811611
85 - 265 V (AC), 5 V, 2 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 15 V
Output Current 12 A
Output Voltage 25 V
Output Current 22 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 100
Inductance800 µH
Turns Ratio20 : 0.833 : 0.833 : 2.16 : 1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width33.8 mm
Height12 mm
MountSMT 
SizeEFD20 
WE-OLEFD Offline Transformer
7508116312
85 - 265 V (AC), 12 V, 1 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 112 V
Output Current 11 A
Output Voltage 212 V
Output Current 21 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 120
Inductance800 µH
Turns Ratio20:1.8:1.8:2.2:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width33.8 mm
Height12 mm
MountSMT 
SizeEFD20 
WE-OLEFD Offline Transformer
750811643
85 - 265 V (AC), 24 V, 0.5 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 124 V
Output Current 10.5 A
Output Voltage 224 V
Output Current 20.5 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 120
Inductance800 µH
Turns Ratio20:3.6:3.6:2.2:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width33.8 mm
Height12 mm
MountSMT 
SizeEFD20 
WE-OLEFD Offline Transformer
7508112327
85 - 265 V (AC), 16 V, 1.3 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 116 V
Output Current 11.3 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 130
Inductance800 µH
Turns Ratio20:2.4:2.2:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width33.8 mm
Height12 mm
MountSMT 
SizeEFD20 
WE-OLEFD Offline Transformer
7508112510
85 - 265 V (AC), 32 V, 0.75 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 132 V
Output Current 10.75 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 120
Inductance800 µH
Turns Ratio20:4.8:2.2:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width33.8 mm
Height12 mm
MountSMT 
SizeEFD20 
WE-OLEFD Offline Transformer
7508112511
85 - 265 V (AC), 40 V, 0.6 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 140 V
Output Current 10.6 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 120
Inductance800 µH
Turns Ratio20:6:2.2:1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width33.8 mm
Height12 mm
MountSMT 
SizeEFD20 
WE-OLEFD Offline Transformer
750811913
85 - 265 V (AC), 5 V, 1.25 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 15 V
Output Current 11.25 A
Output Voltage 25 V
Output Current 21.25 A
Output Voltage 37 V
Output Current 31.1 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 130
Inductance800 µH
Turns Ratio16.66 : 0.833 : 0.833 : 1.166 : 2.166 : 1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width33.8 mm
Height12 mm
MountSMT 
SizeEFD20 
WE-OLEFD Offline Transformer
750811914
85 - 265 V (AC), 5 V, 1.3 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 15 V
Output Current 11.3 A
Output Voltage 25 V
Output Current 21.3 A
Output Voltage 319 V
Output Current 30.5 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 140
Inductance800 µH
Turns Ratio20 : 0.8 : 0.8 : 2.8 : 2.2 : 1 
Saturation Current1.4 A
Insulation Test Voltage4500 V (AC)
Length21.5 mm
Width33.8 mm
Height12 mm
MountSMT 
SizeEFD20 
WE-OLEFD Offline Transformer
750811512
85 - 265 V (AC), 5 V, 1.575 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 15 V
Output Current 11.575 A
Output Voltage 25 V
Output Current 21.575 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 120
Inductance770 µH
Turns Ratio20:1:1:2.75:1.25 
Saturation Current2 A
Insulation Test Voltage4500 V (AC)
Length26.3 mm
Width33 mm
Height14.81 mm
MountTHT 
SizeEFD25 
WE-OLEFD Offline Transformer
7508116314
85 - 265 V (AC), 12 V, 1.3 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 112 V
Output Current 11.3 A
Output Voltage 212 V
Output Current 21.3 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 100
Inductance450 µH
Turns Ratio16.66:2:2.33:1 
Saturation Current2.1 A
Insulation Test Voltage4500 V (AC)
Length26.3 mm
Width33 mm
Height14.81 mm
MountTHT 
SizeEFD25 
WE-OLEFD Offline Transformer
750811645
85 - 265 V (AC), 24 V, 0.71 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 124 V
Output Current 10.71 A
Output Voltage 224 V
Output Current 20.71 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 100
Inductance470 µH
Turns Ratio16.66:4:4:2.33:1 
Saturation Current2 A
Insulation Test Voltage4500 V (AC)
Length26.3 mm
Width33 mm
Height14.48 mm
MountTHT 
SizeEFD25 
WE-OLEFD Offline Transformer
7508112334
85 - 265 V (AC), 16 V, 1.64 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 116 V
Output Current 11.64 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 110
Inductance414 µH
Turns Ratio16:2.33:2:1 
Saturation Current2.2 A
Insulation Test Voltage4500 V (AC)
Length26.3 mm
Width33 mm
Height14.81 mm
MountTHT 
SizeEFD25 
WE-OLEFD Offline Transformer
7508112514
85 - 265 V (AC), 32 V, 1 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 132 V
Output Current 11 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 110
Inductance460 µH
Turns Ratio16:4.66:2:1 
Saturation Current1.9 A
Insulation Test Voltage4500 V (AC)
Length26.3 mm
Width33 mm
Height14.81 mm
MountTHT 
SizeEFD25 
WE-OLEFD Offline Transformer
7508112515
85 - 265 V (AC), 40 V, 0.8 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 140 V
Output Current 10.8 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 105
Inductance500 µH
Turns Ratio16.66:6.33:2.33:1 
Saturation Current1.9 A
Insulation Test Voltage4500 V (AC)
Length26.3 mm
Width33 mm
Height14.81 mm
MountTHT 
SizeEFD25 
WE-OLEFD Offline Transformer
750811616
85 - 265 V (AC), 5 V, 1.7 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 15 V
Output Current 11.7 A
Output Voltage 212 V
Output Current 22 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 250
Inductance468 µH
Turns Ratio20:1:2.33:2.66:1.33 
Saturation Current2.5 A
Insulation Test Voltage4500 V (AC)
Length26.3 mm
Width33 mm
Height14.81 mm
MountTHT 
SizeEFD25 
WE-OLEFD Offline Transformer
750811617
85 - 265 V (AC), 5 V, 1.1 A
Simu­lation
Status Activei| Production is active. Expected lifetime: >10 years.
Input Voltage 85 - 265 V (AC)
Output Voltage 15 V
Output Current 11.1 A
Output Voltage 224 V
Output Current 20.6 A
Auxiliary Voltage20 V
Auxiliary Voltage 214 V
Auxiliary Voltage 16 V
Switching Frequency 68 - 170
Inductance793 µH
Turns Ratio20:4.5:1:2.75:1.25 
Saturation Current2 A
Insulation Test Voltage4500 V (AC)
Length26.3 mm
Width33 mm
Height14.81 mm
MountTHT 
SizeEFD25