QS8K21 Datasheet 45V Nch + Nch Middle Power MOSFET llOutline TSMT8 V 45V DSS R (Max.) 53m DS(on) I 4A D P 1.5W D llFeatures llInner circuit 1) Low on - resistance. 2) Built-in G-S protection diode. 3) Small surface mount package(TSMT8) 4) Pb-free lead plating RoHS compliant llPackaging specifications Embossed Packing Tape llApplication Reel size (mm) 180 Switching Tape width (mm) 8 Type Basic ordering unit (pcs) 3000 Taping code TR Marking K21 llAbsolute maximum ratings (T = 25C) <It is the same ratings for the Tr1 and Tr2> a Parameter Symbol Value Unit V Drain - Source voltage 45 V DSS Continuous drain current I 4 A D *1 I Pulsed drain current 12 A D,pulse V Gate - Source voltage 20 V GSS total 1.5 *2 P D Power dissipation element 1.25 W *3 P total 0.7 D T Junction temperature 150 j T Range of storage temperature -55 to +150 stg www.rohm.com 2015 ROHM Co., Ltd. All rights reserved. 1/11 20150730 - Rev.001 QS8K21 Datasheet llThermal resistance Values Parameter Symbol Unit Min. Typ. Max. total - - 83.3 *2 R thJA Thermal resistance, junction - ambient element - - 100 /W *3 R total - - 178 thJA llElectrical characteristics (T = 25C) <It is the same characteristics for the Tr1 and Tr2> a Values Parameter Symbol Conditions Unit Min. Typ. Max. Drain - Source breakdown V V = 0V, I = 1mA 45 - - V (BR)DSS GS D voltage V I = 1mA (BR)DSS D Breakdown voltage - 46.8 - mV/ temperature coefficient T referenced to 25 j Zero gate voltage I V = 45V, V = 0V - - 1 A DSS DS GS drain current Gate - Source I V = 0V, V = 20V - - 10 A GSS DS GS leakage current Gate threshold V V = 10V, I = 1mA 1.0 - 2.5 V GS(th) DS D voltage V I = 1mA GS(th) D Gate threshold voltage - -3.9 - mV/ temperature coefficient T referenced to 25 j V = 10V, I = 4A - 38 53 GS D Static drain - source *4 R V = 4.5V, I = 4A - 48 67 m DS(on) GS D on - state resistance V = 4V, I = 4A - 53 75 GS D Gate input resistance R f = 1MHz, open drain - 6 - G Forward Transfer *4 Y V = 10V, I = 4A 2 - - S fs DS D Admittance www.rohm.com 2015 ROHM Co., Ltd. All rights reserved. 2/11 20150730 - Rev.001