PD-2.043 rev. D 12/97 21FQ... SERIES 30 Amp SCHOTTKY RECTIFIER Major Ratings and Characteristics Description/Features The 21FQ Schottky rectifier series has been optimized for very low forward voltage drop, with moderate leakage. The proprietary barrier technology allows for reliable operation up to 150° C junction temperature. Typical applications are in switching power supplies, converters, free-wheeling diodes, and reverse battery protection. Characteristics 21FQ... Units I F(AV) Rectangular 30 A 35 to 45 V I FSM @ tp = 5 µs sine 7800 A Very low forward voltage drop High frequency operation VF @ 30 Apk, TJ = 125°C 0.51 V TJ range - 65 to 150 °C Guard ring for enhanced ruggedness and long term reliability Hermetic packaging waveform VRRM range 150° C TJ operation CASE STYLE AND DIMENSIONS Conforms to JEDEC Outline DO-203AA (DO-4) Dimensions in millimeters and inches www.irf.com 1 21FQ... Series PD-2.043 rev. D 12/97 Voltage Ratings Part number VR 21FQ035 21FQ040 21FQ045 35 40 45 Max. DC Reverse Voltage (V) VRWM Max. Working Peak Reverse Voltage (V) Absolute Maximum Ratings Parameters IF(AV) Max. Average Forward Current * See Fig. 5 IFSM 21FQ Units 30 A Max. Peak One Cycle Non-Repetitive 7800 Surge Current * See Fig. 7 600 EAS Non-Repetitive Avalanche Energy 40 mJ IAR Repetitive Avalanche Current 6 A Conditions 50% duty cycle @ TC = 107 °C, rectangular wave form 5µs Sine or 3µs Rect. pulse A 10ms Sine or 6ms Rect. pulse Following any rated load condition and with rated VRRM applied TJ = 25 °C, IAS= 6 Amps, L = 2.2 mH Current decaying linearly to zero in 1 µsec Frequency limited by TJ max. VA = 1.5 x VR typical Electrical Specifications Parameters VFM Max. Forward Voltage Drop (1) * See Fig. 1 IRM Max. Reverse Leakage Current (1) 21FQ Units Conditions 0.57 V @ 30A 0.69 V @ 60A 0.51 V @ 30A 0.65 V @ 60A TJ = 25 °C TJ = 125 °C 4 mA TJ = 25 °C * See Fig. 2 150 mA TJ = 125 °C CT Max. Junction Capacitance 1850 pF VR = 5V DC, (test signal range 100Khz to 1Mhz) 25 °C LS Typical Series Inductance 6.5 nH Measured from top of terminal to mounting plane 10,000 V/ µs dv/dt Max. Voltage Rate of Change (Rated VR) VR = rated VR (1) Pulse Width < 300µs, Duty Cycle < 2% Thermal-Mechanical Specifications 21FQ Units TJ Parameters Max. Junction Temperature Range -65 to 150 °C Tstg Max. Storage Temperature Range Conditions -65 to 150 °C RthJC Max. Thermal Resistance Junction to Case 1.25 °C/W RthCS Typical Thermal Resistance, Case to 0.50 °C/W Mounting surface , smooth and greased DCoperation * See Fig. 4 Heatsink wt Approximate Weight T Mounting Torque Case Style 2 5.8 (0.2) g (oz.) Min. 14 (12) Max. 23 (20) Kg-cm Non-lubricated threads (Ibf-in) DO-203AA(DO-4) JEDEC www.irf.com 21FQ... Series PD-2.043 rev. D 12/97 1000 1000 ReverseCurrent -I (mA) R T =150°C J 125°C 100°C 10 75°C 1 50°C .1 25°C .01 .001 0 10000 T = 25°C J 1 .1 .2 .3 .4 .5 .6 .7 .8 .9 10 15 20 25 30 35 40 45 Fig. 2 - Typical Values of Reverse Current Vs. Reverse Voltage T =125°C J .1 0 5 ReverseVoltage- VR(V) T =150°C J 10 JunctionCapacitance- C (pF) T Instantaneous Forward Current - I (A) F 100 100 T =25°C J 1000 100 0 1 1.1 1.2 10 20 30 40 50 ReverseVoltage -VR(V) ForwardVoltage Drop - VFM(V) Fig. 3 - Typical Junction Capacitance Vs. Reverse Voltage Fig. 1 - Maximum Forward Voltage Drop Characteristics Thermal Impedance- Z (°C/W ) thJC 10 1 .1 D=0.50 D=0.33 D=0.25 D=0.17 D=0.08 P DM t 1 t2 Notes: 1. Duty factor D= t1/ t2 .01 SinglePulse (Thermal Resistance) .001 .00001 .0001 .001 2. Peak T =P x Z +T J DM thJC C .01 .1 1 10 100 t1, Rectangular Pulse Duration(Seconds) Fig. 4 - Maximum Thermal Impedance ZthJC Characteristics www.irf.com 3 21FQ... Series PD-2.043 rev. D 12/97 25 21FQ RthJC (DC) =1.25°C/W AveragePower Loss - (Watts) AllowableCase Temperature- (°C) 155 145 135 DC 125 115 0 5 D=0.08 D=0.17 20 D=0.25 D=0.33 D=0.50 15 10 RMSLimit 5 0 0 10 15 20 25 30 35 40 45 DC AverageForwardCurrent - IF(AV) (A) 5 10 15 20 25 30 35 40 45 AverageForwardCurrent - I (A) F(AV) Fig. 5 - Maximum Allowable Case Temperature Vs. Average Forward Current Fig. 6 - Forward Power Loss Characteristics Non-Repetitive Surge Current - I FSM (A) 10000 1000 At Any Rated Load Condition And With Rated VRRM Applied Following Surge 100 10 100 1000 10000 Square Wave Pulse Duration - tp (microsec) Fig. 7 - Maximum Non-Repetitive Surge Current L DUT IRFP460 Rg = 25 ohm CURRENT MONITOR HIGH-SPEED SWITCH FREE-WHEEL DIODE + Vd = 25 Volt 40HFL40S02 Fig. 8 - Unclamped Inductive Test Circuit 4 www.irf.com