A heat spreader (1; 1'), comprising: a base plate (2; 2') for receiving a heat load from at least one electric component, the base plate including pulsating heat pipes (4; 4') for fluid flow arranged therein, wherein the base plate (2; 2') has a first side, and a second side which is opposite to the first side; the pulsating heat pipes comprise a plurality of multichannel heat tubes (4; 4') which are embedded side by side on the first side of the base plate (2; 2'); and the second side of the base plate (2; 2') is provided for attaching the electric components, a trough (5; 5') extending perpendicularly to the first side is formed for the heat tubes (4, 4') on the first side of the base plate (2, 2')), the trough (5; 5') having borders (6a, 6b, 6c, 6d; 6a', 6b', 6c', 6c') the height of which corresponding to the height or the thickness of the embedded heat tubes (4; 4'), wherein two opposite borders (6a, 6b; 6a', 6b') of the trough (5; 5') and corresponding multiport ends (4a; 4a') of the heat tubes (4; 4') form adjacent flow spaces (7; 7') between two adjacent heat tubes (4, 4') at a time and wherein a lateral distance in between two adjacent flow spaces (7; 7') corresponds to the width of two heat tubes (4; 4'), and wherein these flow spaces (7; 7') on the opposite sides (6a, 6a') of the trough (5; 5') are laterally offset to each other for an amount which corresponds to the width of one heat tube (4; 4') thereby creating a serpentine-like flow path between adjacent heat tubes (4; 4') for pulsating heat pipe function, characterized in that. the trough is rectangular and the ends of the heat tubes having cut ends with an angle when seen in a direction perpendicularly to the first side, both cut ends on each heat tube having essentially same cutting angle, wherein by alternating orientation of two adjacent heat tubes, triangular connection or flow spaces are formed between two opposite, essentially straight borders (6a, 6a) of the trough and corresponding angled cut ends of the heat tubes, thereby creating a serpentine-like flow path between adjacent heat tubes for pulsating heat pipe function, or the ends of the heat tubes are cut at right angle(β) perpendicularly to a longitudinal direction defined by the heat tubes when seen in a direction perpendicularly to the first side) and the corresponding opposite borders (6a', 6b') of the trough have recesses the width of each recess corresponding essentially to the width of two heat tubes, wherein the connection or flow spaces are formed between these recesses and corresponding straight cut ends of the heat tubes, thereby creating a serpentine-like flow path between adjacent heat tubes for pulsating heat pipe function. a base plate (2; 2') for receiving a heat load from at least one electric component, the base plate including pulsating heat pipes (4; 4') for fluid flow arranged therein, wherein the base plate (2; 2') has a first side, and a second side which is opposite to the first side; the pulsating heat pipes comprise a plurality of multichannel heat tubes (4; 4') which are embedded side by side on the first side of the base plate (2; 2'); and the second side of the base plate (2; 2') is provided for attaching the electric components, a trough (5; 5') extending perpendicularly to the first side is formed for the heat tubes (4, 4') on the first side of the base plate (2, 2')), the trough (5; 5') having borders (6a, 6b, 6c, 6d; 6a', 6b', 6c', 6c') the height of which corresponding to the height or the thickness of the embedded heat tubes (4; 4'), wherein two opposite borders (6a, 6b; 6a', 6b') of the trough (5; 5') and corresponding multiport ends (4a; 4a') of the heat tubes (4; 4') form adjacent flow spaces (7; 7') between two adjacent heat tubes (4, 4') at a time and wherein a lateral distance in between two adjacent flow spaces (7; 7') corresponds to the width of two heat tubes (4; 4'), and wherein these flow spaces (7; 7') on the opposite sides (6a, 6a') of the trough (5; 5') are laterally offset to each other for an amount which corresponds to the width of one heat tube (4; 4') thereby creating a serpentine-like flow path between adjacent heat tubes (4; 4') for pulsating heat pipe function, characterized in that. the trough is rectangular and the ends of the heat tubes having cut ends with an angle when seen in a direction perpendicularly to the first side, both cut ends on each heat tube having essentially same cutting angle, wherein by alternating orientation of two adjacent heat tubes, triangular connection or flow spaces are formed between two opposite, essentially straight borders (6a, 6a) of the trough and corresponding angled cut ends of the heat tubes, thereby creating a serpentine-like flow path between adjacent heat tubes for pulsating heat pipe function, or the ends of the heat tubes are cut at right angle(β) perpendicularly to a longitudinal direction defined by the heat tubes when seen in a direction perpendicularly to the first side) and the corresponding opposite borders (6a', 6b') of the trough have recesses the width of each recess corresponding essentially to the width of two heat tubes, wherein the connection or flow spaces are formed between these recesses and corresponding straight cut ends of the heat tubes, thereby creating a serpentine-like flow path between adjacent heat tubes for pulsating heat pipe function.