# Current Sensing Transformer, AEC-Q200, 1:20, 340 µH, 40 A, 50.8 Vµs, 10kHz to 1MHz, 0.18 ohm

![Product image](https://novapart.co/image/farnell:2836754/)

**URL**: https://novapart.co/products/CST2010-020LD/current-sensing-transformer-aec-q200-120-340-h-40
**SKU**: CST2010-020LD
**Manufacturer**: COILCRAFT
**Category**: Transformers || Current Sensing Transformers
**Price**: €1.6700
**Stock**: 100+
**Lead Time**: 71 days (indicative)

## Description

Turns Ratio:1:20; DC Resistance:360µohm; Inductance:340µH; ET Constant:50.8Vµs; Primary Current:40A; Transformer Mounting:Surface Mount; Product Range:CST2010 Series; SVHC:No SVHC (15

## Specifications

| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| Inductance | 340µH |
| Et Constant | 50.8Vµs |
| Turns Ratio | 1:20 |
| Dc Resistance | 360µohm |
| Product Range | CST2010 Series |
| Frequency Range | 10kHz to 1MHz |
| Primary Current | 40A |
| Transformer Mounting | Surface Mount |
| Dc Resistance Primary | 360µohm |
| Transformer Terminals | Gull Wing |
| Dc Resistance Secondary | 0.18ohm |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:2836754/)

Document 1100-1 

## **Current Sense Transformers CST2010** 

- AEC-Q200 Grade 1 qualified (–40°C to +125°C ambient) • Sensed current up to 40 A; Frequency range up to 1 MHz • Very low primary DC resistance 

- 500 Vrms, one minute isolation (hipot) between windings. 

## **Core material** Ferrite 

**Terminations** RoHS compliant tin-silver over tin over nickel over phos bronze 

**Weight** 4.13 g 

**Ambient temperature** –40°C to +125°C 

**Maximum part temperature** +165°C (ambient + temp rise) **Storage temperature** Component: –40°C to +125°C. Tape and reel Packaging: –40°C to +80°C 

**Resistance to soldering heat** Max three 40 second reflows at +260°C, parts cooled to room temperature between cycles **Moisture Sensitivity Level (MSL)** 1 (unlimited floor life at <30°C / 85% relative humidity) 

**Failures in Time (FIT) / Mean Time Between Failures (MTBF)** 38 per billion hours / 26,315,789 hours, calculated per Telcordia SR-332 **Packaging** 300/13″ reel; Plastic tape: 32 mm wide, 0.5 mm thick, 20 mm pocket spacing, 10.6 mm pocket depth 

**PCB washing** Tested to MIL-STD-202 Method 215 plus an additional aqueous wash. See Doc787_PCB_Washing.pdf. 

||**Turns (N)**|**Inductance**2|**DCR max**<br>**(Ohms)**|**DCR max**<br>**(Ohms)**|**Frequency**<br>**range**|**Volt-time**<br>**product**3|**Sensed**<br> **currentIin**4|**Terminating**<br> **resistance RT**5|
|---|---|---|---|---|---|---|---|---|
|**Part number**1|**pri : sec**|**min(mH)**|**pri   sec**||**(kHz)**|**(Vµsec)**|**max(A)**|**(Ohms)**|
|CST2010-020L_|1 **:** 20|0.34|0.00036|0.180|10 – 1000|50.8|40|0.5|
|CST2010-030L_|1 **:** 30|0.76|0.00036|0.265|7 – 1000|76.2|40|0.8|
|CST2010-040L_|1 **:** 40|1.36|0.00036|0.560|5 – 1000|101.6|40|1.0|
|CST2010-050L_|1 **:** 50|2.12|0.00036|0.705|4 – 1000|127.0|40|1.3|
|CST2010-060L_|1 **:** 60|3.06|0.00036|0.850|3 – 1000|152.4|40|1.5|
|CST2010-070L_|1 **:** 70|4.16|0.00036|1.00|3 – 1000|177.8|40|1.8|
|CST2010-080L_|1 **:** 80|5.44|0.00036|1.15|2 – 1000|203.2|40|2.0|
|CST2010-100L_|1 **:** 100|8.50|0.00036|1.45|2 – 1000|254.0|40|2.5|
|CST2010-125L_|1 **:** 125|13.3|0.00036|1.85|2 – 1000|317.5|40|3.1|
|CST2010-150L_|1 **:** 150|19.2|0.00036|2.25|1 – 1000|381.0|40|3.8|
|CST2010-200L_|1 **:** 200|34.0|0.00036|4.06|1 – 1000|508.0|40|5.0|



## 1. When ordering, please specify **packaging** code: 

## **CST2010-200LD** 

**Packaging: D** = 13″ machine-ready reel. EIA-481 embossed plastic tape (300 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. 

2. Inductance measured between secondary pins at 1 kHz, 0.1 Vrms, 0 Adc. 

3. Maximum volt-time product is for the secondary, based on 2000 Gauss. 

## **Typical Circuit** 

**==> picture [209 x 71] intentionally omitted <==**

**----- Start of picture text -----**<br>
11 2 +<br>I in (1 turn)Pri (N turns)Sec I out RT Vout<br>” Dil<br>12 4 –<br>**----- End of picture text -----**<br>


4. Primary current of 40 A causes less than 25°C temperature rise from 25°C ambient. Higher current causes a greater temperature rise (see Temperature Rise vs Current curve). 

5. Terminating resistance (RT) value is based on 1 Volt output with 40 Amps flowing through the primary. Varying terminating resistance increases or decreases output Voltage/Ampere according to the following equation: RT = Vout × Nsec/ I in. 

- 6 Electrical specifications at 25°C. 

Refer to Doc 362 “Soldering Surface Mount Components” before soldering. 

**US** +1-847-639-6400   sales@coilcraft.comSpecifications subject to change without notice. **UK** +44-1236-730595   sales@coilcraft-europe.comPlease check our website for latest information. **Taiwan** +886-2-2264 3646   sales@coilcraft.com.tw **China** +86-21-6218 8074   sales@coilcraft.com.cn **Singapore** + 65-6484 8412   sales@coilcraft.com.sg 

Document 1100-1 Revised 04/25/16 

© Coilcraft Inc. 2017 

This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information. 

Document 1100-2 

## **CST2010 SMT Current Sense Transformers** 

## **Temperature Rise vs Current** 

**==> picture [242 x 186] intentionally omitted <==**

**----- Start of picture text -----**<br>
45<br>40<br>35<br>30<br>25<br>20<br>15<br>10<br>5<br>0<br>0 5 10 15 20 25 30 35 40 45 50<br>Current (Arms)<br>Temperature rise (from 25°C)<br>**----- End of picture text -----**<br>


## **Dimensions** 

**==> picture [478 x 253] intentionally omitted <==**

**----- Start of picture text -----**<br>
Dot indicates pin 1<br>0.413<br>10,50 [max]<br>0.004/0,10<br>0.573 0.650<br>14,55  [max] 16,51 [min]<br>0.784 Recommended<br>19,91  [max] Land Pattern<br>0.168 × 0.285<br>(2)<br>0.092 4,27 × 7,24<br>11 2,34<br>10 1 0.0236 0.047 1 10<br>0,60 1,19<br>2 11 9<br>0.4425<br>3 8<br>11,24<br>0.100 0.100 4 12 7<br>6 5 2,54 2,54 5 6<br>12<br>0.356 0.356<br>Dimensions are in [inches ] mm 0.110 × 0.2402,80 × 6,10 (2) 9,04 9,04<br>**----- End of picture text -----**<br>


**==> picture [117 x 44] intentionally omitted <==**

Document 1100-2 Revised 04/25/16 

© Coilcraft Inc. 2017 This product may not be used in medical or high risk applications without prior Coilcraft approval. Specification subject to change without notice. Please check web site for latest information. 

**US** +1-847-639-6400   sales@coilcraft.com **UK** +44-1236-730595   sales@coilcraft-europe.com **Taiwan** +886-2-2264 3646   sales@coilcraft.com.tw **China** +86-21-6218 8074   sales@coilcraft.com.cn **Singapore** + 65-6484 8412   sales@coilcraft.com.sg 



## Links

- [View this product on Novapart](https://novapart.co/products/CST2010-020LD/current-sensing-transformer-aec-q200-120-340-h-40)
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- [Supplier page](https://es.farnell.com/coilcraft/cst2010-020lb/current-transformer-1-20-40a-smd/dp/2836754)
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