SK 409 38,1 STS TO 220

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

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

Manufacturer: FISCHER ELEKTRONIK
Product type: Natural Convection Heat Sinks
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
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: -

Delivery and price
Units per pack	100
Price	2.31 €
Current stock	200+
Lead time	30 days

Datasheet

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

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for semiconductor clip-mounting 

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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 

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|**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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Updated at April 29, 2026

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