# Heat Sink, TO-220/TO-3P, 7 °C/W, TO-3P, TO-220, 45 mm, 38.1 mm, 12.7 mm

![Product image](https://novapart.co/image/farnell:4621300/)

**URL**: https://novapart.co/products/SK%20409%2038,1%20STS%20TO%20220/heat-sink-to-220-3p-7-c-w-45-mm-381-127
**SKU**: SK 409 38,1 STS TO 220
**Manufacturer**: FISCHER ELEKTRONIK
**Category**: Cooling & Thermal Management || Heat Sinks || Natural Convection Heat Sinks
**Price**: €2.3900
**Stock**: 200+
**Lead Time**: 92 days (indicative)

## Description

Thermal Resistance:7°C/W; Packages Cooled:TO-3P, TO-220; External Width - Metric:45mm; External Height - Metric:38.1mm; External Length - Metric:12.7mm; External Diameter - Metric:-; Heat

## Specifications

| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| Product Range | - |
| Packages Cooled | TO-3P, TO-220 |
| Heat Sink Material | Aluminium |
| Thermal Resistance | 7°C/W |
| External Width - Metric | 45mm |
| External Height - Metric | 38.1mm |
| External Length - Metric | 12.7mm |
| External Width - Imperial | 1.77" |
| External Diameter - Metric | - |
| External Height - Imperial | 1.5" |
| External Length - Imperial | 0.5" |
| External Diameter - Imperial | - |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:4621300/)

> **Extruded** fiiscinerelektronik **heatsinks for PCB mounting** == 

H **A** - 

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**B** 

**C** 

**D** 

**G** 

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**==> picture [3 x 1] intentionally omitted <==**

**----- Start of picture text -----**<br>
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for semiconductor clip-mounting 

**==> picture [558 x 474] intentionally omitted <==**

**----- Start of picture text -----**<br>
art. no. [mm] Rth [K/W]<br>k o OT<br>a SK 409 25,4 ... a TO 220/ TO 3 P 25.4 8.2<br>a SK 409 38,1 ... a TO 220/ TO 3 P 38.1 7.0<br>E<br>a SK 409 50,8 ... TO 220/ TO 3 P 50.8 es 6.2<br>a SK 409 63,5 ... a TO 220/ TO 3 P 63.5 5.6<br>please indicate: ... mouting method<br>STC =with solder pins<br>STICSTCB==withwith solderthreadedpinsboltsandMinsulating3, brass washer F<br>P  = raised retaining stud,  E  = mounting method<br>special lengths and transistor drillings on request<br>surface treatment: black anodised<br>G<br>for semiconductor screw-mounting<br>H<br>~ I<br>... STS ‘lr ... STIS vl .. STSB fill<br>TL asim Tees rae<br>a art. no. [mm] Rth [K/W]<br>a SK 409 25,4 ... a TO 220/ TO 3 P 25.4 8.2 K<br>a SK 409 38,1 ... a TO 220/ TO 3 P 38.1 7.0<br>a SK 409 50,8 ... a TO 220/ TO 3 P 50.8 6.2<br>a SK 409 63,5 ... as TO 220/ TO 3 P ee 63.5 5.6<br>please indicate: ... moutingSTS =withmethodsolder pins L<br>STIS =with solder pins and insulating washer<br>STSB=with threaded bolts M 3, brass<br>**----- End of picture text -----**<br>


**E** = mounting method 

special lengths and transistor drillings on request **surface treatment:** black anodised 

**H** 

**H** 

|**Heatsinks with threaded rail**|➔|**A 90**|**Attachable heatsinks for TO-cases**|➔|**A 91**||
|---|---|---|---|---|---|---|
|**Profiles for PCB components**<br>**Retaining springs for transistors**|➔<br>➔|**A 89**<br>**A 111 – 116**|**Mounting for TO 3 angle**<br>**Silicone wafers**|➔<br>➔|**A 121**<br>**E 2 – 4**|**A 96**|
|**Order example**|➔|**A 21**|**Mica wafers**|➔|**E 11**||



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## Links

- [View this product on Novapart](https://novapart.co/products/SK%20409%2038,1%20STS%20TO%20220/heat-sink-to-220-3p-7-c-w-45-mm-381-127)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/fischer-elektronik/sk-409-38-1-sts/heat-sink-to-220-to-3p-7-c-w/dp/4621300)
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