SMD Switching Diodes BAS521-HF Reverse Voltage: 300 Volts Forward Current: 250 mA RoHS Device Halogen Free SOD-523 0.067(1.70) 0.059(1.50) 0.051(1.30) 0.043(1.10) Features - Ultra small plastic SMD package. 0.028(0.70) 0.020(0.50) 0.035(0.90) 0.028(0.70) - High voltage switching diode. - 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) Typical 0.010(0.25) 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 T =25°C unless otherwise noted) A Symbol Value Unit VRRM 300 V VR 300 V IF 250 mA IFRM 1 A Non-repetitive peak forward surge current tp=1ms;square wave; TJ=25°C prior to surge IFSM 4.5 A Total power dissipation Ptot 500 mW TJ 150 °C TSTG, Tamb -65 ~ +150 °C Parameter Repetitive peak reverse voltage Continous reverse voltage Continous forward currnt Ts≤90°C; Note 1 Repetitive forward current tp=1ms Ts≤90°C; Note 1 Junction temperature Storage and operating ambient temperature Note: Ts is temperature at the soldering point of the cathode tab. Electrical Characteristics (at T =25°C unless otherwise noted) A Parameter Symbol Conditions Min. Typ. 300 340 Max. Unit Breakdown voltage VBR IR=100uA Forwardvoltage VF IF=100mA 0.95 1.1 V IR VR=250V 30 150 nA IR VR=250V, TJ=150°C 40 100 μA Diode capacitance Cd VR=0V, f=1MHz 0.4 5 pF Reverse recovery time trr When switching from IF=30mA to IR=30mA; RL=100W; measured at IR=3mA 16 50 nS Reverse current V Company reserves the right to improve product design , functions and reliability without notice. REV:A Page 1 QW-J0004 Comchip Technology CO., LTD. SMD Switching Diodes RATING AND CHARACTERISTIC CURVES (BAS521-HF) Fig.2 - Reverse current as a function of junction temperature Fig.1 - Forward current as a function of forward voltage; typical values 2 10 400 TA=150°C Reverse Current, (μA) Forward Current, (mA) 500 TA=25°C 300 TA=75°C 200 100 10 1.0 -1 10 VR = VRmax Typical values -2 0 0 0.5 1 10 1.5 0 40 Fig.3 - Maximum permissible continuous forward current as a function of ambient temperature. 120 160 200 Fig.4 - Diode capacitance as a function of reverse voltage; typical values 300 0.42 Diode Capacitance , (pF) Continous Forward Current , (mA) 80 Junction Temperature, (°C) Forward Voltage, (V) 200 100 0.38 0.34 0.30 0 0 50 100 150 200 0 Ambient Temperature, (°C) 10 20 30 40 Reverse Voltage, (V) Fig.5 - Maximum permissible non-repetitive peak forward current as a Function of pulse duration 2 Peak Forward Surge Current, (A) 10 10 1 -1 10 1 10 2 10 3 10 4 10 Pulse Duration, (us) Company reserves the right to improve product design , functions and reliability without notice. REV:A Page 2 QW-J0004 Comchip Technology CO., LTD. SMD Switching Diodes Reel Taping Specification P0 d P1 T E F B A W C P 12 o 0 D2 D1 D W1 Trailer Device ....... ....... End ....... ....... Leader ....... ....... 10 pitches (min) ....... ....... Start 10 pitches (min) Direction of Feed SOD-523 SOD-523 SYMBOL A B C d D D1 D2 (mm) 0.95 ± 0.05 1.94 ± 0.05 0.73 ± 0.10 1.50 + 0.10 178 ± 1.00 54.00 ± 0.50 13.00 ± 0.50 (inch) 0.037 ± 0.002 0.076 ± 0.002 0.029 ± 0.004 0.059 + 0.004 7.008 ± 0.039 2.126 ± 0.020 0.512 ± 0.020 SYMBOL E F P P0 P1 W W1 (mm) 1.75 ± 0.10 3.50 ± 0.05 2.00 ± 0.05 4.00 ± 0.10 2.00 ± 0.05 8.00 + 0.30 /–0.10 9.50 ± 1.00 (inch) 0.069 ± 0.004 0.138 ± 0.002 0.079 ± 0.002 0.157 ± 0.004 0.079 ± 0.002 0.315 + 0.012 /–0.004 0.374 ± 0.039 Company reserves the right to improve product design , functions and reliability without notice. REV:A Page 3 QW-J0004 Comchip Technology CO., LTD. SMD Switching Diodes Marking Code Part Number Marking Code BAS521-HF L4 L4 Suggested PAD Layout SOD-523 A SIZE (mm) (inch) A 1.40 0.055 B 0.40 0.016 C 0.40 0.016 C B Standard Packaging REEL PACK Case Type SOD-523 REEL Reel Size ( pcs ) (inch) 3,000 7 Company reserves the right to improve product design , functions and reliability without notice. REV:A Page 4 QW-J0004 Comchip Technology CO., LTD.