Major Ratings and Characteristics
IF(AV) Rectangular 18 A
waveform
VRRM range 35 to 45 V
IFSM @ tp = 5 µs sine 1800 A
VF@
18 Apk, TJ
= 125°C 0.53 V
TJrange - 55 to 175 °C
Characteristics 18TQ Units
Description/Features
The 18TQ Schottky rectifier series has been optimized for
low reverse leakage at high temperature. The proprietary
barrier technology allows for reliable operation up to 175°C
junction temperature. Typical applications are in switching
power supplies, converters, free-wheeling diodes, and re-
verse battery protection.
175° C TJ operation
High purity, high temperature epoxy encapsulation for
enhanced mechanical strength and moisture resistance
Low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
Bulletin PD-20178 rev. B 12/01
18TQ...
18TQ...S
IF(AV) = 18Amp
VR = 35 to 45V
SCHOTTKY RECTIFIER 18 Amp
1www.irf.com
Case Styles
20TQ...
TO-220AC
20TQ... S
D2PAK
Anode
13
Base
Cathode
2
N
/C
Anode
13
C
athode
Base
Cathode
2
18TQ... Series
2
Bulletin PD-20178 rev. B 12/01
www.irf.com
VFM Max. Forward Voltage Drop (1) 0.60 V @ 18A
* See Fig. 1 0.72 V @ 36A
0.53 V @ 18A
0.67 V @ 36A
IRM Max. Reverse Leakage Current (1) 2.5 mA TJ = 25 °C
* See Fig. 2 25 mA TJ = 125 °C
CTMax. Junction Capacitance 1400 pF VR = 5VDC, (test signal range 100Khz to 1Mhz) 25 °C
LSTypical Series Inductance 8.0 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
Electrical Specifications
Parameters 18TQ Units Conditions
(1) Pulse Width < 300µs, Duty Cycle < 2%
TJMax. Junction Temperature Range -55 to 175 °C
Tstg Max. Storage Temperature Range -55 to 175 °C
RthJC Max. Thermal Resistance Junction 1.50 °C/W DC operation * See Fig. 4
to Case
RthCS Typical Thermal Resistance, Case to 0.50 °C/W Mounting surface , smooth and greased
Heatsink
wt Approximate Weight 2 (0.07) g (oz.)
T Mounting Torque Min. 6 (5)
Max. 12 (10)
Thermal-Mechanical Specifications
Parameters 18TQ Units Conditions
Kg-cm
(Ibf-in)
IF(AV) Max. Average Forward Current 18 A 50% duty cycle @ TC = 149° C, rectangular wave form
* See Fig. 5
IFSM Max. Peak One Cycle Non-Repetitive 1800 5µs Sine or 3µs Rect. pulse
Surge Current * See Fig. 7 390 10ms Sine or 6ms Rect. pulse
EAS Non-Repetitive Avalanche Energy 24 mJ TJ
= 25 °C, IAS
= 3.6 Amps, L = 3.7 mH
IAR Repetitive Avalanche Current 3.6 A Current decaying linearly to zero in 1 µsec
Frequency limited by TJ max. VA = 1.5 x VR typical
Parameters 18TQ Units Conditions
Absolute Maximum Ratings
A
Following any rated
load condition and
with rated VRRM applied
Part number 18TQ035 18TQ040 18TQ045
VRMax. DC Reverse Voltage (V)
VRWM Max. Working Peak Reverse Voltage (V) 35 40 45
Voltage Ratings
18TQ... Series
3
Bulletin PD-20178 rev. B 12/01
www.irf.com
Fig. 2 - Typical Values of Reverse Current
Vs. Reverse Voltage
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage
Fig. 4 - Maximum Thermal Impedance ZthJC Characteristics
100
1000
10000
0 1020304050
T = 25°C
J
Reverse Vol tage - V (V)
R
T
Junct i on Capacitance - C (pF)
.001
.01
.1
1
10
.00001 .0001 .001 .01 .1 1 10 100
D = 0.33
D = 0.50
D = 0.25
D = 0.17
D = 0.08
1
thJC
t , Rectangular Pulse Duration (Seconds)
Thermal Impedance - Z (°C/W)
Single Pulse
(Thermal Resistance)
2
t
1
t
P
DM
Not es:
1. Duty factor D = t / t
2. Peak T = P x Z + T
1
JDMthJC C
2
Fig. 1 - Maximum Forward Voltage Drop Characteristics
.1
1
10
100
1000
0.2.4.6.811.21.41.6
FM
F
Instantaneous Forward Current - I (A)
T = 175°C
T = 125°C
T = 25°C
J
J
J
Forward Vol tage Drop - V (V)
.0001
.001
.01
.1
1
10
100
1000
0 5 10 15 20 25 30 35 40 4
5
R
R
T = 175°C
150°C
125°C
100°C
75°C
50°C
25°C
J
Reverse Voltage - V (V)
Reverse Current - I (mA)
18TQ... Series
4
Bulletin PD-20178 rev. B 12/01
www.irf.com
Fig. 8 - Unclamped Inductive Test Circuit
Fig. 5 - Maximum Allowable Case Temperature
Vs. Average Forward Current
Fig. 6 - Forward Power Loss Characteristics
Fig. 7 - Maximum Non-Repetitive Surge Current
150
155
160
165
170
175
180
0 4 8 121620242
8
DC
Al l owabl e Cas e Temperature - (°C)
Average Forward Current - I (A)
F( AV)
18TQ
R (DC) = 1.50°C/W
thJC
0
5
10
15
0 4 8 12 16 20 24 2
8
DC
Average Power Loss - (Watts)
F(AV)
D = 0.08
D = 0.17
D = 0.25
D = 0.33
D = 0.50
RMS Li mit
Average Forward Current - I (A)
100
1000
10000
10 100 1000 10000
FSM
p
Non-Repetitive Surge Current - I (A)
At Any Rated Load Condition
And With Rated V Applied
Following Surge
RRM
Square Wave Pulse Duration - t (microsec)
FREE-WHEEL
D IO D E
40HFL40S02
CURRENT
MONITOR
HIGH-SPEED
SW ITCH
IRFP460
L
DUT
Rg = 25 ohm
Vd = 25 Volt
+
18TQ... Series
5
Bulletin PD-20178 rev. B 12/01
www.irf.com
Outline Table
Conform to JEDEC outline TO-220AC
Dimensions in millimeters and (inches)
3.78 (0.15)
3.54 (0.14)
10.54 (0.41)
MAX.
DIA.
15.24 (0.60)
14.84 (0.58)
2.92 (0.11)
2.54 (0.10)
1
TERM 2
14.09 (0.55)
13.47 (0.53)
3.96 (0.16)
3.55 (0.14)
0.94 (0.04)
0.69 (0.03)
4.57 (0.18)
4.32 (0.17)
30.61 (0.02) MAX.
5.08 (0.20) REF.
1.32 (0.05)
1.22 (0.05)
6.48 (0.25)
6.23 (0.24)
2°
0.10 (0.004)
1.40 (0.05)
1.15 (0.04)
2.89 (0.11)
2.64 (0.10)
1
3
2.04 (0.080) MAX.
Conform to JEDEC outline D2Pak (SMD-220)
Dimensions in millimeters and (inches)
10.16 (0.40)
REF.
8.89 (0.35)
4.57 (0.18)
4.32 (0.17)
0.61 (0.02) MAX.
5.08 (0.20) REF.
1.32 (0.05)
1.22 (0.05)
13
6.47 (0.25)
6.18 (0.24)
93°
REF.
2.61 (0.10)
2.32 (0.09)
5.28 (0.21)
4.78 (0.19)
4.69 (0.18)
4.20 (0.16)
0.55 (0.02)
0.46 (0.02)
14.73 (0.58)
15.49 (0.61)
1.40 (0.055)
1.14 (0.045)
3X
0.93 (0.37)
0.69 (0.27)
2X
11.43 (0.45)
17.78 (0.70)
8.89 (0.35)
3.81 (0.15)
2.08 (0.08)
2X
2.54 (0.10)
2X
MINIMUM RECOMMENDED FOOTPRINT
2
Anode
13
Base
Cathode
Cathode
Anode
13
Base
Cathode
2
N
/C
18TQ... Series
6
Bulletin PD-20178 rev. B 12/01
www.irf.com
Marking Information
TRR
FEED DIRECTION
TRL
FEED DIRECTION
10.90 (0.429)
10.70 (0.421) 16.10 (0.634)
15.90 (0.626)
1.75 (0.069)
1.25 (0.049)
1.85 (0.073)
1.65 (0.065)
4.10 (0.161)
3.90 (0.153)
1.60 (0.063)
1.50 (0.059)
DIA.
1.60 (0.063)
1.50 (0.059)
DIA.
11.60 (0.457)
11.40 (0.449)
15.42 (0.609)
15.22 (0.601)
4.72 (0.186)
4.52 (0.178)
24 .30 (0.95 7)
23 .90 (0.94 1)
0.368 (0.0145)
0.342 (0.0135)
360 (14.173)
DIA. MAX.
26.40 (1.039)
24.40 (0.961)
13.50 (0.532)
12.80 (0.504) DIA.
60 (2 .36 2)
DIA. MIN.
SMD-220 Tape & Reel
When ordering, indicate the part
number, part orientation, and the
quantity. Quantities are in multiples
of 800 pieces per reel fo r bo th
TRL and TRR.
Dimensions in millimeters and (inches)
Tape & Reel Information
18TQ045S
THIS IS A 18TQ045-S
LOT CODE 8024
ASSEMBLED ON WW 02, 2000
IN THE ASSEMBLY LINE "L"
ASSEMBLY
LOT CODE
INTERNATIONAL
RECTIFIER
LOGO
PART NUMBER
DATE CODE
YEAR 0 = 2000
WEEK 02
LINE L
18TQ... Series
7
Bulletin PD-20178 rev. B 12/01
www.irf.com
Ordering Information Table
Device Code
1 5
243
1- Essential Part Number
2- T = TO-220
3- Q = Schottky Q Series
4- Voltage Rating
5-S=D
2Pak
18 T Q 045 S
035 = 35V
040 = 40V
045 = 45V
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. 12/01
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.
