Characteristics Value Units
Major Ratings and Characteristics Description/Features
The STPS40L45CW center tap Schottky rectifier 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 applica-
tions are in switching power supplies.
150° C TJ operation
Center tap TO-247 package
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Very low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
Dimensions in millimeters and inches
Conform to JEDEC outline TO-247AC (TO-3P)
2
BASE
COMMON
CATHODE
123
ANODE
COMMON
CATHODE
A
NODE
12
15.90 (0.626)
15.30 (0.602)
14.20 (0.559)
14. 80 ( 0.583)
3.70 (0.145)
4.30 (0.170)
5.30 (0.208)
5.70 (0.225)
5.50 (0.217)
4.50 (0.177)
(2 PLCS.)
3. 55 (0.139)
3.65 (0.144)
2. 20 (0.087)
MAX.
1.00 (0.039)
1.40 (0.056)
0.40 (0.213)
0.80 (0.032)
4.70 (0.185)
5.30 (0.209)
1.5 (0.059)
2.5 ( 0.098)
2. 40 (0.095)
MAX.
10.86 (0.427)
10.94 (0.430)
20.30 (0.800)
19.70 (0.775)
DIA.
12 3
TO-247AC
IF(AV) Rectangular 40 A
waveform
VRRM 45 V
IFSM @ tp = 5 µs sine 1240 A
VF@
20 Apk, TJ=125°C 0.42 V
(per leg, Typical)
TJ- 55 to 150 °C
SCHOTTKY RECTIFIER
STPS40L45CW
Bulletin PD-20621 05/01
2 x 20 Amps
1
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STPS40L45CW
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IF(AV) Max. Average Forward (Per Leg) 20 A 50% duty cycle @ TC = 122 °C, rectangular wave form
Current * See Fig. 5 (Per Device) 40
IFSM Max. Peak One Cycle Non-Repetitive 1240 5µs Sine or 3µs Rect. pulse
Surge Current (Per Leg) * See Fig. 7 350 10ms Sine or 6ms Rect. pulse
EAS Non-Repetitive Avalanche Energy 20 mJ TJ = 25 °C, IAS
= 3 Amps, L = 4.4 mH
(Per Leg)
IAR Repetitive Avalanche Current 3 A Current decaying linearly to zero in 1 µsec
(Per Leg) Frequency limited by TJ max. VA = 1.5 x VR typical
Part number STPS40L45CW
VRMax. DC Reverse Voltage (V)
VRWM Max. Working Peak Reverse Voltage (V) 45
TJMax. Junction Temperature Range -55 to 150 °C
Tstg Max. Storage Temperature Range -55 to 150 °C
RthJC Max. Thermal Resistance Junction 1.6 °C/W DC operation * See Fig. 4
to Case (Per Leg)
RthJC Max. Thermal Resistance Junction 0.8 °C/W DC operation
to Case (Per Package)
RthCS Typical Thermal Resistance, Case 0.24 °C/W Mounting surface , smooth and greased
to Heatsink
wt Approximate Weight 6 (0.21) g (oz.)
T Mounting Torque Min. 6 (5) Non-lubricated threads
Max. 12 (10)
Case Style TO-247AC(TO-3P) JEDEC
Thermal-Mechanical Specifications
Kg-cm
(Ibf-in)
Parameters 40L45CW Units Conditions
Absolute Maximum Ratings
Following any rated
load condition and with
rated VRRM
applied
Parameters Value Units Conditions
A
Typ. Max.
VFM Forward Voltage Drop 0.48 0.53 V @ 20A
(Per Leg) * See Fig. 1 (1) 0.61 0.69 V @ 40A
0.42 0.49 V @ 20A
0.60 0.70 V @ 40A
IRM Reverse Leakage Current - 1.5 mA TJ = 25 °C
(Per Leg) * See Fig. 2 (1) 20 80 mA TJ = 100 °C
VF(TO) Threshold Voltage 0.27 V TJ = TJ max.
rtForward Slope Resistance 8.72 mΩ
CTMax. Junction Capacitance (Per Leg) - 1500 pF VR = 5VDC, (test signal range 100Khz to 1Mhz) 25°C
LSTypical Series Inductance (Per Leg) 7.5 - nH Measured lead to lead 5mm from package body
dv/dt Max. Voltage Rate of Change 10000 V/ µs
(Rated VR)
TJ = 25 °C
TJ = 125 °C
VR = rated VR
Parameters Value Units Conditions
(1) Pulse Width < 300µs, Duty Cycle <2%
Voltage Ratings
Electrical Specifications
STPS40L45CW
Bulletin PD-20621 05/01
3
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Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage (Per Leg)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage (Per Leg)
Fig. 4 - Max. Thermal Impedance ZthJC Characteristics (Per Leg)
Fig. 1 - Max. Forward Voltage Drop Characteristics
(Per Leg)
100
1000
10000
0 1020304050
R
T
Junction Capacitance - C (pF)
Reverse Voltage - V (V)
T = 25 C
J
1
10
100
1000
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
In stan taneous Forward C urrent - I (A)
F
FM
T = 150 C
T = 125 C
T = 25 C
J
J
J
Forward Voltage Drop - V (V)
0.001
0.01
0.1
1
10
100
1000
0 5 10 15 20 25 30 35 40 45
R
R
125 C
100 C
75 C
50 C
25 C
Reverse Current - I (mA)
Reverse Voltage - V (V)
T = 150 C
J
0.01
0.1
1
10
0.00001 0.0001 0.001 0.01 0.1 1 10 100
thJC
Single Pulse
(Thermal Resistance)
1
Thermal Impedance Z ( C/W)
D = 0.75
D = 0.50
D = 0.33
D = 0.25
D = 0.20
t , Rectangular Pulse Duration (Seconds)
12
C
thJC
DM
J
2
t
1
t
P
DM
Notes:
1. Duty factor D = t / t
2. Peak T = P x Z + T
STPS40L45CW
Bulletin PD-20621 05/01
4www.irf.com
Fig. 7 - Max. Non-Repetitive Surge Current (Per Leg)
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (Per Leg)
Fig. 8 - Unclamped Inductive Test Circuit
Fig. 6 - Forward Power Loss Characteristics
(Per Leg)
FREE-WHEEL
DIO DE
40HFL40S02
CURRENT
MONITOR
HIGH-SPEED
SWITCH
IRFP460
L
DUT
Rg = 25 ohm
Vd = 25 Volt
+
(2) Formula used: TC = TJ - (Pd + PdREV) x RthJC ;
Pd = Forward Power Loss = IF(AV) x VFM @ (IF(AV) / D) (see Fig. 6);
PdREV = Inverse Power Loss = VR1 x IR (1 - D); IR @ VR1 = 80% rated VR
0
2
4
6
8
10
12
14
16
18
0 5 10 15 20 25 30
DC
Average Power Loss - (Watts)
F(AV)
RMS Limit
D = 0.20
D = 0.25
D = 0.33
D = 0.50
D = 0.75
Average Forward Current - I (A)
100
110
120
130
140
150
0 5 10 15 20 25 30
DC
Allowable Case Temperature - ( C)
F(AV)
see note (2)
Average Forward Current - I (A)
Square wave (D = 0.50)
80% Rated V applied
R
100
1000
10000
10 100 1000 10000
FSM
Non-Repetitive Surge Current - I (A)
p
At Any Rated Load Condition
And W ith Rated V Applied
Following Surge
RRM
Square Wave Pulse D uration - t (microsec)
STPS40L45CW
Bulletin PD-20621 05/01
5
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IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7309
Visit us at www.irf.com for sales contact information. 05/01
Data and specifications subject to change without notice.
This product has been designed and qualified for Industrial Level.
Qualification Standards can be found on IR's Web site.
