ETD34/17/11-3C90

Transformer Cores, Half Core, ETD, ETD34, 3C90, 78.6 mm, 97.1 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:ETD; Core Size:ETD34; Core Material Grade:3C90; For Use With:-; Effective Magnetic Path Length:78.6mm; Ae Effective Cross Section Area:97.1mm²; Inductance Factor Al:2.7µH; Product Range
SVHC: No SVHC (17-Jan-2023)
Core Size: ETD34
Core Type: ETD
For Use With: -
Product Range: -
Core Material Grade: 3C90
Inductance Factor Al: 2.7µH
Effective Magnetic Path Length: 78.6mm
Ae Effective Cross Section Area: 97.1mm²

Delivery and price
Units per pack	2940
Price	0.444 €
Current stock	1000+
Lead time	30 days

Datasheet

## _**FERROXCUBE**_ 

**ETD34/17/11** ETD cores and accessories Supersedes data of September 2004 2008 Sep 01 

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Ferroxcube 

ETD34/17/11 

## ETD cores and accessories 

## **CORE SETS** 

## **Effective core parameters** 

|**SYMBOL**|**PARAMETER**|**VALUE**|**UNIT**|
|---|---|---|---|
|Σ(I/A)|core factor (C1)|0.810|mm−1|
|Ve|<br>effective volume|7640|mm3|
|Ie|effective length|78.6|mm|
|Ae|effective area|97.1|mm2|
|Amin|minimum area|91.6|mm2|
|m|mass of core half|≈20|g|



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handbook, halfpage<br>11.8 [0.6]<br>0 17.3<br>   0.2<br>35 [0]<br>1.6<br>25.6 [1.4]<br>0<br>11.1 [0]<br>0.6<br>11.1 [0]<br>0.6<br>MGC176<br>Dimensions in mm.<br>Fig.1  ETD34/17/11 core half.<br>**----- End of picture text -----**<br>


## **Core halves** 

Clamping force for AL measurements, 40 ±20 N. Gapped cores are available on request. 

|**GRADE**|**AL**<br>**(nH)**|µ**e**|**AIR GAP**<br>**(**µ**m)**|**TYPE NUMBER**|
|---|---|---|---|---|
|3C90|2700±25%|≈1740|≈0|ETD34/17/11-3C90|
|3C94|2700±25%|≈1740|≈0|ETD34/17/11-3C94|
|3C95|3270±25%|≈2110|≈0|ETD34/17/11-3C95|
|3C96|2500±25%|≈1610|≈0|ETD34/17/11-3C96|
|3F3|2500±25%|≈1610|≈0|ETD34/17/11-3F3|
|3F35|1850±25%|≈1190|≈0|ETD34/17/11-3F35|



2008 Sep 01 

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Ferroxcube 

## ETD cores and accessories 

## ETD34/17/11 

## **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 = 25 kHz;**<br>**= 200 mT;**<br>**T = 100**°**C**<br>**B**ˆ|**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|
|3C90|≥330|≤0.92|≤0.97|−|−|−|
|3C94|≥330|−|≤0.73|−|≤4.2|−|
|3C95|≥330|−|−|≤4.51|≤4.28|−|
|3C96|≥340|−|≤0.55|−|≤3.4|−|
|3F3|≥320|−|≤0.9|−|−|≤1.6|
|3F35|≥300|−|−|−|−|−|



## **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>**= 50 mT;**<br>**T = 100** °**C**<br>**B**ˆ|**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 = 3 MHz;**<br>**= 10 mT;**<br>**T = 100**°**C**<br>**B**ˆ|
|3C90|≥330|−|−|−|−|
|3C94|≥330|−|−|−|−|
|3C95|≥330|−|−|−|−|
|3C96|≥340|≤2.8|−|−|−|
|3F3|≥320|−|−|−|−|
|3F35|≥300|≤1.0|≤8.0|−|−|



2008 Sep 01 

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Ferroxcube 

## ETD cores and accessories 

## ETD34/17/11 

## **COIL FORMERS** 

## **General data 14-pins ETD34/17/11 coil former** 

|**PARAMETER**|**SPECIFICATION**|
|---|---|
|Coil former material|polybutyleneterephtalate (PBT), glass-reinforced, flame retardant<br>in accordance with_“UL 94V-0”_; UL file number E45329(R)|
|Pin 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|



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**----- Start of picture text -----**<br>
39.6 max.<br>35.3 min. 42.8 max.<br>25.4   − [0   ] 0.2 23.4   − [0   ] 0.2<br>handbook, full pagewidth 11.4  [+][0.1] 0    20.9 min.<br>5.08<br>∅13.4   − [0   ] 0.2<br>32.9<br>max.<br>4<br>1.6  [+][0.15] CBW280<br>0<br>5.08<br>5.08 0.8<br>30.48 25.4<br>Dimensions in mm.<br>Fig.2  ETD34/17/11 coil former; 14-pins.<br>**----- End of picture text -----**<br>


## **Winding data and area product for 14-pins ETD34/17/11 coil former** 

|**NUMBER O**<br>**SECTIONS**|**F**<br><br>**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|123|20.9|60|11900|CPH-ETD34-1S-14P(1)|



## **Note** 

1. Also available with ∅1.0 mm pins. 

2008 Sep 01 

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Ferroxcube 

## ETD cores and accessories 

## ETD34/17/11 

## **General data 14-pins coaxial ETD34/17/11 coil former** 

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**----- Start of picture text -----**<br>
PARAMETER SPECIFICATION<br>Coil former material phenolformaldehyde (PF), glass-reinforced, flame retardant<br>in accordance with  “UL 94V-0” ; UL file number E167521(M)<br>Pin material copper-tin alloy (CuSn), tin (Sn) plated<br>Maximum operating temperature 180 °C,  “IEC 60085” , class H<br>Resistance to soldering heat “IEC 60068-2-20” , Part 2, Test Tb, method 1B, 350 °C, 3.5 s<br>Solderability “IEC 60068-2-20” , Part 2, Test Ta, method 1<br>32.6 max 39.8 max<br>handbook, full pagewidth 21.15 00.1 25.4 00.2<br>(17.05 min) 11.4 [0.2]<br>0<br>O13.1 [0.15]<br>0<br>4.5<br>O1 5.08<br>2.7 30.48 MGC178<br>39.8 max 42.9 max<br>handbook, full pagewidth 0 0<br>25.4 0.2 21.7 0.15<br>11.4 [0.2] (18.85 min)<br>0<br>0.15 O20.15<br>O18.4<br>0   0.1<br>32.6<br>max<br>MGC179<br>4.5<br>5.08 O1<br>30.48 22.7<br>Dimensions in mm.<br>For mounting grid and method of fitting, see Fig.4.<br>Fig.3  Coaxial ETD34/17/11 coil former; 14-pins.<br>**----- End of picture text -----**<br>


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Ferroxcube 

## ETD cores and accessories 

## ETD34/17/11 

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**----- Start of picture text -----**<br>
5.08<br>handbook, full pagewidth 0.1<br>CSCI-ETD34-1S-7P<br>14 8<br>CSCO-ETD34-1S-7P<br>CBW590<br>PH 1.6  [+][0.15]<br>1 ETD34 7 0<br>Dimensions in mm.<br>This coil former incorporates 8 mm creepage distance between primary and secondary windings, as<br>well as between primary and all other conductive parts (in accordance with IEC 380 safety regulations).<br>Fig.4  Mounting grid and method of fitting.<br>**----- End of picture text -----**<br>


## **Winding data and area product for coaxial ETD34/17/11 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|42.6|17.05|49.4|4140|CSCI-ETD34-1S-7P|
|1|46.6|18.85|71.4|4520|CSCO-ETD34-1S-7P|



2008 Sep 01 

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Ferroxcube 

## ETD cores and accessories 

## ETD34/17/11 

## **MOUNTING PARTS** 

## **General data** 

|**General data**||||
|---|---|---|---|
|**ITEM**|**REMARKS**|**FIGURE**|**TYPE NUMBER**|
|Mountingclip|material: stainless steel|5|CLI-ETD34|



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handbook, halfpage9<br>22 37.8 min<br>MGC181 0.4 11<br>Dimensions in mm.<br>Fig.5  Mounting clip for ETD34/17/11.<br>**----- End of picture text -----**<br>


2008 Sep 01 

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Ferroxcube 

ETD cores and accessories 

## ETD34/17/11 

## **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 

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Updated at April 28, 2026

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