FK 318 SA 3

Heat Sink, TO-3, 4.8 °C/W, TO-3, 46 mm, 31.8 mm, 46 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:4.8°C/W; Packages Cooled:TO-3; External Width - Metric:46mm; External Height - Metric:31.8mm; External Length - Metric:46mm; External Diameter - Me; Available until stocks are exhausted
SVHC: No SVHC (25-Jun-2025)
Product Range: -
Packages Cooled: TO-3
Heat Sink Material: Aluminium
Thermal Resistance: 4.8°C/W
External Width - Metric: 46mm
External Height - Metric: 31.8mm
External Length - Metric: 46mm
External Width - Imperial: 1.81"
External Diameter - Metric: -
External Height - Imperial: 1.25"
External Length - Imperial: 1.81"
External Diameter - Imperial: -

Delivery and price
Units per pack	10
Price	7.88 €
Current stock	10+
Lead time	30 days

Datasheet

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## **Finger shaped heatsinks for power semiconductors** 

**art. no.** [mm] Rth [K/W] **art. no.** [mm] Rth [K/W] re ee ~~ee~~ **FK 127 SA-3** 12.7 8.0 TO 3 **FK 127 SA** 12.7 8.0 without Po **FK 191 SA-3** 19.1 6.6 TO 3 **FK 191 SA** 19.1 6.6 without Po **FK 318 SA-3** 31.8 4.8 TO 3 **FK 318 SA** 31.8 4.8 without Po **FK 254 SA-3** 25.4 5.8 TO 3 ~~i~~ ae ~~eG~~ Gd **material:** die-cast aluminium **surface treatment:** black lacquered 

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art. no. [mm] Rth art. no. [mm] Rth<br>Le [K/W] eLe [K/W] e<br>FK 201 SA 25.4 6 without FK 202 SA 12.7 8 without<br>a ee es<br>FK 201 SA 3 25.4 6 TO 3 FK 202 SA 3 12.7 8 TO 3<br>Po<br>FK 201 SA CB 25.4 6 CB FK 202 SA CB 12.7 8 CB<br>a BR es G e<br>**----- End of picture text -----**<br>


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S art. no. [mm] e Rth [K/W]<br>a FK 205 SA L a 31.8 9.0 L<br>a FK 206 SA L a 25.4 10.5 L<br>a FK 207 SA L ee 19.1 12.0 L<br>a FK 208 SA L a 12.7 14.0 L<br>material: aluminium<br>surface treatment: black anodised<br>**----- End of picture text -----**<br>


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**H Attachable heatsinks** ➔ **C 10 – 14 Snap rivet** ➔ **E 37 Heatsinks for TO 5 and TO 18** ➔ **C 15 – 16 Kapton insulator washers** ➔ **E 8 Heatsinks for D PAK** ➔ **C 17 Silicone wafers** ➔ **E 2 – 4 Aluminium oxide wafers** ➔ **E 9 – 10 Mica wafers** ➔ **E 11** 

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Updated at June 10, 2026

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