EFD15/8/5-3F3-S

Transformer Cores, EFD, EFD15, 3F3, 34 mm, 15 mm²

⚠️ Reference pricing provided. In case of supply shortages, we will connect you with our trusted procurement partners to ensure your project's continuity.

Manufacturer: FERROXCUBE
Product type: Transformer Cores
Core Type:EFD; Core Size:EFD15; Core Material Grade:3F3; For Use With:-; Effective Magnetic Path Length:34mm; Ae Effective Cross Section Area:15mm²; Inductance Factor Al:780nH; Product Range:-; SV
SVHC: No SVHC (17-Jan-2023)
Core Size: EFD15
Core Type: EFD
For Use With: -
Product Range: -
Core Material Grade: 3F3
Inductance Factor Al: 780nH
Effective Magnetic Path Length: 34mm
Ae Effective Cross Section Area: 15mm²

Delivery and price
Units per pack	1000
Price	0.966 €
Current stock	200+
Lead time	30 days

Datasheet

## _**FERROXCUBE**_ 

**EFD15/8/5** EFD cores and accessories Supersedes data of September 2004 2008 Sep 01 

**==> picture [347 x 67] intentionally omitted <==**

Ferroxcube 

## EFD cores and accessories 

## EFD15/8/5 

## **CORES** 

## **Effective core parameters** 

|**SYMBOL**|**PARAMETER**|**VALUE**|**UNIT**|
|---|---|---|---|
|Σ(I/A)|core factor (C1)|2.27|mm−1|
|Ve|effective volume|510|mm3|
|Ie|effective length|34.0|mm|
|Ae|effective area|15.0|mm2|
|Amin|minimum area|12.2|mm2|
|m|mass of core half|≈1.4|g|



**==> picture [242 x 256] intentionally omitted <==**

**----- Start of picture text -----**<br>
handbook, halfpage<br>5.5<br>7.5 ±0.25<br>±0.15<br>15 ±0.4<br>11 ±0.35<br>5.3<br>±0.15<br>4.65 0.2<br>±0.15 2.4<br>±0.1<br>CBW366<br>Dimensions in mm.<br>Fig.1  EFD15/8/5 core half.<br>**----- End of picture text -----**<br>


## **Core sets** 

Clamping force for AL measurements, 20 ±5 N. 

|**GRADE**|**AL**<br>**(nH)**|µ**e**|**AIR GAP**<br>**(**µ**m)**|**TYPE NUMBER**|
|---|---|---|---|---|
|3C90|63±5%|≈115|≈400|EFD15/8/5-3C90-A63-S|
||100±8%|≈180|≈220|EFD15/8/5-3C90-A100-S|
||160±10%|≈290|≈120|EFD15/8/5-3C90-A160-S|
||950±25%|≈1700|≈0|EFD15/8/5-3C90-S|
|3C94|63±5%|≈115|≈400|EFD15/8/5-3C94-A63-S|
||100±8%|≈180|≈220|EFD15/8/5-3C94-A100-S|
||160±10%|≈290|≈120|EFD15/8/5-3C94-A160-S|
||950±25%|≈1700|≈0|EFD15/8/5-3C94-S|
|3C95|1140±25%|≈2070|≈0|EFD15/8/5-3C95-S|
|3C96|850±25%|≈1520|≈0|EFD15/8/5-3C96-S|
|3F3|63±5%|≈115|≈400|EFD15/8/5-3F3-A63-S|
||100±8%|≈180|≈220|EFD15/8/5-3F3-A100-S|
||160±10%|≈290|≈120|EFD15/8/5-3F3-A160-S|
||780±25%|≈1400|≈0|EFD15/8/5-3F3-S|
|3F35|630±25%|≈1130|≈0|EFD15/8/5-3F35-S|
|3F4|63±5%|≈115|≈360|EFD15/8/5-3F4-A63-S|
||100±8%|≈180|≈190|EFD15/8/5-3F4-A100-S|
||160±10%|≈290|≈90|EFD15/8/5-3F4-A160-S|
||400±25%|≈720|≈0|EFD15/8/5-3F4-S|
|3F45|400±25%|≈720|≈0|EFD15/8/5-3F45-S|



2008 Sep 01 

2 

Ferroxcube 

## EFD cores and accessories 

## EFD15/8/5 

## **Properties of core sets under power conditions** 

|**GRADE**|**B (mT) at**|**CORE LOSS (W) at**|**CORE LOSS (W) at**|**CORE LOSS (W) at**|**CORE LOSS (W) at**|**CORE LOSS (W) at**|
|---|---|---|---|---|---|---|
||**H = 250 A/m;**<br>**f = 25 kHz;**<br>**T = 100**°**C**|**f = 100 kHz;**<br>**= 100 mT;**<br>**T = 100**°**C**<br>**B**ˆ|**f = 100 kHz;**<br>**= 200 mT;**<br>**T = 25**°**C**<br>**B**ˆ|**f = 100 kHz;**<br>**= 200 mT;**<br>**T = 100**°**C**<br>**B**ˆ|**f = 400 kHz;**<br>**= 50 mT;**<br>**T = 100**°**C**<br>**B**ˆ|**f = 500 kHz;**<br>**= 50 mT;**<br>**T = 100**°**C**<br>**B**ˆ|
|3C90|≥320|≤0.057|−|−|−|−|
|3C94|≥320|≤0.045|−|≤0.28|−|−|
|3C95|≥320|−|≤0.28|≤0.27|−|−|
|3C96|≥340|≤0.035|−|≤0.22|≤0.09|≤0.19|
|3F35|≥300|−|−|−|≤0.05|≤0.06|
|3F3|≥315|≤0.06|−|−|≤0.1|−|
|3F4|≥250||−|−|−|−|



## **Properties of core sets under power conditions (continued)** 

|**GRADE**|**B (mT) at**|**CORE LOSS (W) at**|**CORE LOSS (W) at**|**CORE LOSS (W) at**|**CORE LOSS (W) at**|
|---|---|---|---|---|---|
||**H = 250 A/m;**<br>**f = 25 kHz;**<br>**T = 100**°**C**|**f = 500 kHz;**<br>**= 100 mT;**<br>**T = 100** °**C**<br>**B**ˆ|**f = 1 MHz;**<br>**= 30 mT;**<br>**T = 100**°**C**<br>**B**ˆ|**f = 1 MHz;**<br>**= 50 mT;**<br>**T = 100**°**C**<br>**B**ˆ|**f = 3 MHz;**<br>**= 10 mT;**<br>**T = 100**°**C**<br>**B**ˆ|
|3C90|≥320|−|−|−|−|
|3C94|≥320|−|−|−|−|
|3C95|≥320|−|−|−|−|
|3C96|≥340|−|−|−|−|
|3F35|≥300|≤0.5|−|−|−|
|3F3|≥315|−|−|−|−|
|3F4|≥250|−|≤0.15|−|≤0.24|
|3F45|≥250|−|≤0.12|≤0.45|≤0.2|



2008 Sep 01 

3 

Ferroxcube 

## EFD cores and accessories 

## EFD15/8/5 

## **COIL FORMERS** 

## **General data** 

|**General data**||
|---|---|
|**PARAMETER**|**SPECIFICATION**|
|Coil former material|phenolformaldehyde (PF), glass reinforced, flame retardant in accordance with<br>_“UL 94V-0”_; UL file number E167521(M)|
|Pin material|copper-tin alloy(CuSn), Ni flash, tin (Sn) plated, see note 1|
|Maximum operatingtemperature|180 °C,_“IEC 60085”_, class H|
|Resistance to solderingheat|_“IEC 60068-2-20”_, Part 2, Test Tb, method 1B, 350°C, 3.5 s|
|Solderability|_“IEC 60068-2-20”_, Part 2, Test Ta, method 1: 235°C, 2 s|



**==> picture [439 x 194] intentionally omitted <==**

**----- Start of picture text -----**<br>
0<br>10.55 0.15 3.75<br>0 0<br>6.95 10.4<br>0.1 0.15<br>5.58 [0.1] 8.85 min<br>0<br>8 max 7.5 max 2.63 [0.1] 0 4 00.1 13.75<br>3.6<br>9.7 ±0.1<br>3.75 ±0.1 O 0.6 CBW580<br>11.25±0.1  1 3.75 ±0.1 1 .3 [0.15]<br>0<br>15.2 max 16.7 max<br>Dimensions in mm.<br>**----- End of picture text -----**<br>


Fig.2  EFD15/8/5 coil former; 8-pins. 

**Winding data and area product for EFD15/8/5 coil former with 8-pins** 

|**NUMBER OF**<br>**SECTIONS**|**WINDING**<br>**AREA**<br>**(mm2)**|**MINIMUM**<br>**WINDING**<br>**WIDTH**<br>**(mm)**|**AVERAGE**<br>**LENGTH OF**<br>**TURN**<br>**(mm)**|**AREA**<br>**PRODUCT**<br>**Ae x Aw**<br>**(mm4)**|**TYPE NUMBER**|
|---|---|---|---|---|---|
|1|14.8|8.85|26.3|222|CSH-EFD15-1S-8P(1)|



## **Note** 

1. Also available with post-inserted pins. 

2008 Sep 01 

4 

Ferroxcube 

## EFD cores and accessories 

## EFD15/8/5 

## **COIL FORMERS** 

## **General data** 

|**General data**||
|---|---|
|**PARAMETER**|**SPECIFICATION**|
|Coil former material|liquid crystal polymer (LCP), glass reinforced, flame retardant in accordance<br>with_“UL 94V-0”_; UL file number E54705(M)|
|Pin material|copper-tin alloy(CuSn), nickel flash, tin (Sn) plated|
|Maximum operatingtemperature|155 °C,_“IEC 60085”_, class F|
|Resistance to solderingheat|_“IEC 60068-2-20”_, Part 2, Test Tb, method 1B, 350°C, 3.5 s|
|Solderability|_“IEC 60068-2-20”_, Part 2, Test Ta, method 1: 235°C, 2 s|



**==> picture [472 x 182] intentionally omitted <==**

**----- Start of picture text -----**<br>
10.55   [0]<br>− 0.15<br>6.65   [0] 10.4   [0]<br>− 0.1 − 0.15<br>9.15 min 0.5<br>5.5 [+0.1]<br>       0<br>0.2 0.4<br>7.5   − 0.15 [0] 2.6       0 [+0.1] 3.7  − 0.1 [0]<br>13.75<br>3.8 ± 0.3<br>0.3<br>1 [+0.15]<br>1.35 min     0 3.75<br>1 13.75<br>18.5 ± 0.2 18.5 ± 0.2 MFW046<br>Dimensions in mm.<br>**----- End of picture text -----**<br>


Fig.3  EFD15/8/5 coil former; 8-pins. 

## **Winding data and area product for EFD15/8/5 coil former (PCB) with 8-pins** 

|**NUMBER OF**<br>**SECTIONS**|**WINDING**<br>**AREA**<br>**(mm2)**|**MINIMUM**<br>**WINDING**<br>**WIDTH**<br>**(mm)**|**AVERAGE**<br>**LENGTH OF**<br>**TURN**<br>**(mm)**|**AREA**<br>**PRODUCT**<br>**Ae x Aw**<br>**(mm4)**|**TYPE NUMBER**|
|---|---|---|---|---|---|
|1|16.7|9.15|25.6|251|CPH-EFD15-1S-8PD-Z|



2008 Sep 01 

5 

Ferroxcube 

## EFD cores and accessories 

## EFD15/8/5 

## **COIL FORMERS** 

## **General data** 

|**General data**||
|---|---|
|**PARAMETER**|**SPECIFICATION**|
|Coil former material|liquid crystal polymer (LCP), glass reinforced, flame retardant in accordance<br>with_“UL 94V-0”_; UL file number E54705 (M)|
|Solder pad material|copper-tin alloy(CuSn), tin (Sn) plated|
|Maximum operatingtemperature|155 °C,_“IEC 60085”_, class F|
|Resistance to solderingheat|_“IEC 60068-2-20”_, Part 2, Test Tb, method 1B, 350°C, 3.5 s|
|Solderability|_“IEC 60068-2-20”_, Part 2, Test Ta, method 1: 235°C, 2 s|



**==> picture [452 x 173] intentionally omitted <==**

**----- Start of picture text -----**<br>
2.8<br>10.5<br>6.85 −0.2 10.5 −0.2<br>5.4 +0.2 8.9 min.<br>17<br>7.35 2.7 −0.2 3.75 −0.2<br>max.<br>0.4 0.8 5 15.1 max.<br>10 18.2<br>CBW499 15.1 max. 21.3 1.6 2.5<br>Dimensions in mm.<br>**----- End of picture text -----**<br>


Fig.4  EFD15/8/5 coil former (SMD); 10-solder pads. 

**Winding data and area product for EFD15/8/5 coil former (SMD)** 

|**NUMBER**<br>**OF**<br>**SECTIONS**|**NUMBER**<br>**OF SOLDER**<br>**PADS**|**WINDING**<br>**AREA**<br>**(mm2)**|**MINIMUM**<br>**WINDING**<br>**WIDTH**<br>**(mm)**|**AVERAGE**<br>**LENGTH OF**<br>**TURN**<br>**(mm)**|**AREA**<br>**PRODUCT**<br>**Ae x Aw**<br>**(mm4)**|**TYPE NUMBER**|
|---|---|---|---|---|---|---|
|1|10|16.0|8.9|26|240|CPHS-EFD15-1S-10P|



2008 Sep 01 

6 

Ferroxcube 

## EFD cores and accessories 

## EFD15/8/5 

## **COIL FORMERS** 

## **General data** 

|**General data**||
|---|---|
|**PARAMETER**|**SPECIFICATION**|
|Coil former material|phenolformaldehyde (PF), glass reinforced, flame retardant in accordance with<br>_“UL 94V-0”_; UL file number E41429 (M)|
|Pin material|copper-tin alloy(CuSn), tin (Sn) plated|
|Maximum operatingtemperature|180 °C,_“IEC 60085”_, class H|
|Resistance to solderingheat|_“IEC 60068-2-20”_, Part 2, Test Tb, method 1B, 350°C, 3.5 s|
|Solderability|_“IEC 60068-2-20”_, Part 2, Test Ta, method 1: 235°C, 2 s|



**==> picture [450 x 164] intentionally omitted <==**

**----- Start of picture text -----**<br>
10.55 −0.15<br>6.65 −0.1 10.4 −0.15<br>5.55 9.25 min.<br>+0.1<br>15<br>handbook, full pagewidth<br>8 2.6 +0.1 3.9 −0.1<br>max.<br>2.8<br>0.3 3.75 1.5 16<br>11.25 18.7 max. 2<br>CBW498 16.7 max. 2 3.75<br>Dimensions in mm.<br>**----- End of picture text -----**<br>


Fig.5  EFD15/8/5 coil former (SMD). 

**Winding data and area product for EFD15/8/5 (SMD) coil former** 

|**NUMBER OF**<br>**SECTIONS**|**WINDING**<br>**AREA**<br>**(mm2)**|**MINIMUM**<br>**WINDING**<br>**WIDTH**<br>**(mm)**|**AVERAGE**<br>**LENGTH OF**<br>**TURN**<br>**(mm)**|**AREA**<br>**PRODUCT**<br>**Ae x Aw**<br>**(mm4)**|**TYPE NUMBER**|
|---|---|---|---|---|---|
|1|16.7|9.25|24.1|251|CSHS-EFD15-1S-8P-Z|



2008 Sep 01 

7 

Ferroxcube 

## EFD cores and accessories 

## EFD15/8/5 

## **MOUNTING PARTS** 

## **General data** 

|**General data**||||
|---|---|---|---|
|**ITEM**|**REMARKS**|**FIGURE**|**TYPE NUMBER**|
|Clamp|stainless steel (CrNi); clampingforce≈25 N|6|CLM-EFD15|
|Clip|stainless steel (CrNi); clampingforce≈12.5 N|7|CLI-EFD15|



**==> picture [497 x 293] intentionally omitted <==**

**----- Start of picture text -----**<br>
16.5 −0.3<br>13.5 15 ±0.2<br>12 12.5<br>handbook, full pagewidth<br>4<br>14.3 − 0.2 7 + 0.5<br>CBW497<br>Dimensions in mm.<br>Fig.6  Clamp: CLM-EFD15.<br>**----- End of picture text -----**<br>


**==> picture [360 x 168] intentionally omitted <==**

**----- Start of picture text -----**<br>
5 4.5<br>handbook, halfpage<br>19 13.3<br>MGC354 2.6<br>Dimensions in mm.<br>**----- End of picture text -----**<br>


Fig.7  Clip: CLI-EFD15. 

2008 Sep 01 

8 

Ferroxcube 

EFD cores and accessories 

## EFD15/8/5 

## **DATA SHEET STATUS DEFINITIONS** 

|**DATA SHEET**<br>**STATUS**|**PRODUCT**<br>**STATUS**|**DEFINITIONS**|
|---|---|---|
|Preliminary<br>specification|Development|This data sheet contains preliminary data. Ferroxcube reserves the right to<br>make changes at any time without notice in order to improve design and<br>supplythe best possible product.|
|Product specification|Production|This data sheet contains final specifications. Ferroxcube reserves the right<br>to make changes at any time without notice in order to improve design and<br>supplythe best possible product.|



## **DISCLAIMER** 

 **Life support applications** These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Ferroxcube customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Ferroxcube for any damages resulting from such application. 

## **PRODUCT STATUS DEFINITIONS** 

|**STATUS**|**INDICATION**|**DEFINITION**|
|---|---|---|
|**Prototype**||These are products that have been made as development samples for the purposes of<br>technical evaluation only. The data for these types is provisional and is subject to<br>change.|
|**Design-in**||These products are recommended for new designs.|
|**Preferred**||These products are recommended for use in current designs and are available via our<br>sales channels.|
|**Support**||These products are**not**recommended for new designs and may not be available<br>through all of our sales channels. Customers are advised to check for availability.|



2008 Sep 01 

9

Updated at April 28, 2026

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