# Heat Sink, Square, PCB, Clip On, 21 °C/W, TO-220, 14.5 mm, 12.7 mm, 19 mm

![Product image](https://novapart.co/image/farnell:4621141/)

**URL**: https://novapart.co/products/FK%20237%20SA%20220%20O/heat-sink-square-pcb-clip-on-21-c-w-to-220-145-mm
**SKU**: FK 237 SA 220 O
**Manufacturer**: FISCHER ELEKTRONIK
**Category**: Cooling & Thermal Management || Heat Sinks || Natural Convection Heat Sinks
**Price**: €1.2400
**Stock**: 1000+
**Lead Time**: 106 days (indicative)

## Description

Thermal Resistance:21°C/W; Packages Cooled:TO-220; External Width - Metric:14.5mm; External Height - Metric:12.7mm; External Length - Metric:19mm; External Diameter - Metric:-; Heat Sink Materi

## Specifications

| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| Product Range | - |
| Packages Cooled | TO-220 |
| Heat Sink Material | Aluminium |
| Thermal Resistance | 21°C/W |
| External Width - Metric | 14.5mm |
| External Height - Metric | 12.7mm |
| External Length - Metric | 19mm |
| External Width - Imperial | 0.57" |
| External Diameter - Metric | - |
| External Height - Imperial | 0.5" |
| External Length - Imperial | 0.75" |
| External Diameter - Imperial | - |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:4621141/)

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**A** 

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**D** 

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## **Attachable heatsink** 

– narrow version with better thermal resistance – max. 14.5 mm wide 

– 3 different lengths for varied dissipation power – takes less space than any other attachable heatsink – simple assembly by pushing the heatsink onto the TO 220 housing 

– the cooling fingers form spring clamps **(1+2)** , which pushes the TO 220 and it's mounting flange onto the heatsink **(3)** 

– optimum heat transfer due the constant pressure on the entire contact surface of the TO 220 cases 

– effective heat emmision with horizontal and vertical mounting 

without soldering lug 

## **art. no.** |[sid] **FK 242 SA 220 O art. no.** 

## **FK 237 SA 220 O art. no.** |t—“(twsC **FK 240 SA 220 O** 

***** = touch in edge of transistor 

**material:** aluminium **surface treatment:** black anodised 

**H** 

**H Heatsinks for D PAK** `➔` **C 17 Technical introduction** `➔` **A 2 - 7 H Heatsinks for transistors** `➔` **C 4 – 9 U-shaped heatsink** `➔` **A 119 – 121 Silicone wafers** `➔` **E 2 – 4 Aluminium oxide wafers** `➔` **E 9 – 10 Mica wafers** `➔` **E 11 Kapton insulator washers** `➔` **E 8** 

**C 13** 

**N** 

**H** 



## Links

- [View this product on Novapart](https://novapart.co/products/FK%20237%20SA%20220%20O/heat-sink-square-pcb-clip-on-21-c-w-to-220-145-mm)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/fischer-elektronik/fk-237-sa-220-o/heat-sink-to-220-21-c-w/dp/4621141)
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