SMD Switching Diodes BAS521-HF Reverse Voltage: 300 Volts Forward Current: 250 mA RoHS Device SOD-523 Halogen Free 0.067(1.70) 0.059(1.50) Features 0.051(1.30) 0.043(1.10) - Ultra small plastic SMD package. 0.028(0.70) 0.035(0.90) 0.020(0.50) - High voltage switching diode. 0.028(0.70) - High continuous reverse voltage: 300V - Repetitive peak forward current: 625mA 0.012(0.30) Typ. - High switching speed: max.50ns, Molded plastic Mechanical data 0.004(0.10) 0.010(0.25) Typical 0.006(0.15) - Case: SOD-523 standard package, - Terminals: Solderable per MIL-STD-750, method 2026 Dimensions in inches and (millimeter) - Mounting position: Any - Weight: 0.012 grams(approx.) Circuit Diagram Maximum Ratings (at TA=25C unless otherwise noted) Parameter Symbol Value Unit Repetitive peak reverse voltage VRRM 300 V Continous reverse voltage VR 300 V Continous forward currnt Ts90C Note 1 IF 250 mA Repetitive forward current tp=1ms IFRM 1 A Non-repetitive peak forward surge current IFSM 4.5 A tp=1ms square wave TJ=25C prior to surge Total power dissipation Ts90C Note 1 Ptot 500 mW Junction temperature TJ 150 C Storage and operating ambient temperature TSTG, Tamb -65 ~ +150 C Note: Ts is temperature at the soldering point of the cathode tab. Electrical Characteristics (at TA=25C unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Unit Breakdown voltage VBR IR=100uA 300 340 V Forwardvoltage VF IF=100mA 0.95 1.1 V IR VR=250V 30 150 nA Reverse current A IR VR=250V, TJ=150C 40 100 Diode capacitance pF Cd VR=0V, f=1MHz 0.4 5 When switching from IF=30mA Reverse recovery time trr 16 50 nS to IR=30mA RL=100W measured at IR=3mA REV:A Company reserves the right to improve product design , functions and reliability without notice. QW-J0004 Page 1 Comchip Technology CO., LTD.SMD Switching Diodes RATING AND CHARACTERISTIC CURVES (BAS521-HF) Fig.1 - Forward current as a function of forward Fig.2 - Reverse current as a function of junction voltage typical values temperature 2 500 10 400 TA=150C 10 TA=25C 300 1.0 TA=75C 200 -1 10 100 VR = VRmax -2 Typical values 0 10 0 0.5 1 1.5 0 40 80 120 160 200 Junction Temperature, (C) Forward Voltage, (V) Fig.3 - Maximum permissible continuous forward Fig.4 - Diode capacitance as a function of reverse voltage typical values current as a function of ambient temperature. 300 0.42 200 0.38 100 0.34 0.30 0 0 50 100 150 200 0 10 20 30 40 Ambient Temperature, (C) Reverse Voltage, (V) Fig.5 - Maximum permissible non-repetitive peak forward current as a Function of pulse duration 2 10 10 1 -1 10 2 3 4 1 10 10 10 10 Pulse Duration, (us) Company reserves the right to improve product design , functions and reliability without notice. REV:A QW-J0004 Page 2 Comchip Technology CO., LTD. Forward Current, (mA) Peak Forward Surge Current, (A) Continous Forward Current , (mA) Reverse Current, (A) Diode Capacitance , (pF)