Description/ Features
The 85HQ 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.
175C T
J
operation
Low forward voltage drop
High frequency operation
Guard ring for enhanced ruggedness and long term
reliability
Hermetic packaging
I
F(AV)
Rectangular
85
A
waveform
V
RRM
range
35 to 45
V
I
FSM
@ tp = 5 s sine
9000
A
V
F
@
85 Apk, T
J
=125C
0.62
V
T
J
range
- 65 to 175
C
Major Ratings and Characteristics
Characteristics
85HQ...
Units
TO-203AB (DO-5)
SCHOTTKY RECTIFIER
Amp
85HQ... SERIES
Bulletin PD-2.247 rev. B 11/02
Conforms to JEDEC Outline DO-203AB (DO-5)
Dimensions in millimeters and (inches)
1
www.irf.com
85HQ... Series
2
Bulletin PD-2.247 rev. B 11/02
www.irf.com
V
FM
Max. Forward Voltage Drop (1)
0.72
V
@ 85A
* See Fig. 1
0.89
V
@ 170A
0.62
V
@ 85A
0.77
V
@ 170A
I
RM
Max. Reverse Leakage Current (1)
5
mA
T
J
= 25 C
* See Fig. 2
45
mA
T
J
= 125 C
C
T
Max. Junction Capacitance
2600
pF
V
R
= 5V
DC
, (test signal range 100Khz to 1Mhz) 25 C
L
S
Typical Series Inductance
7.5
nH
Measured from top of terminal to mounting plane
dv/dt Max. Voltage Rate of Change
10000
V/ s
(Rated V
R
)
T
J
= 25 C
T
J
= 125 C
V
R
= rated V
R
Electrical Specifications
Parameters
85HQ Units
Conditions
(1) Pulse Width < 300s, Duty Cycle < 2%
T
J
Max. Junction Temperature Range
-65 to 175
C
T
stg
Max. Storage Temperature Range
-65 to 175
C
R
thJC
Max. Thermal Resistance Junction
0.83
C/W DC operation * See Fig. 4
to Case
R
thCS
Typical Thermal Resistance, Case to
0.25
C/W Mounting surface , smooth and greased
Heatsink
wt
Approximate Weight
15 (0.53) g (oz.)
T
Mounting Torque
Min.
23 (20)
Non-lubricated threads
Max.
46 (40)
Case Style
DO-203AB(DO-5) JEDEC
Kg-cm
(Ibf-in)
Thermal-Mechanical Specifications
Parameters
85HQ Units
Conditions
I
F(AV)
Max. Average Forward Current
85
A
50% duty cycle @ T
C
= 112 C, rectangular wave form
* See Fig. 5
I
FSM
Max. Peak One Cycle Non-Repetitive
9000
5s Sine or 3s Rect. pulse
Surge Current * See Fig. 7
1130
10ms Sine or 6ms Rect. pulse
E
AS
Non-Repetitive Avalanche Energy
114
mJ
T
J
= 25 C, I
AS
= 17 Amps, L = 0.79 mH
I
AR
Repetitive Avalanche Current
17
A
Current decaying linearly to zero in 1 sec
Frequency limited by T
J
max. V
A
= 1.5 x V
R
typical
Parameters
85HQ Units
Conditions
Absolute Maximum Ratings
A
Following any rated
load condition and
with rated V
RRM
applied
Part number
85HQ035
85HQ040
85HQ045
V
R
Max. DC Reverse Voltage (V)
V
RWM
Max. Working Peak Reverse Voltage (V)
35
40
45
Voltage Ratings
85HQ... Series
3
Bulletin PD-2.247 rev. B 11/02
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 Z
thJC
Characteristics
Fig. 1 - Maximum Forward Voltage Drop Characteristics
0.1
1
10
100
1000
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
FM
F
In
st
a
n
t
a
n
e
ou
s F
o
r
w
a
r
d
Cu
r
r
e
n
t
- I (
A
)
T = 175C
T = 125C
T = 25C
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
150C
125C
100C
75C
50C
25C
R
e
v
e
r
s
e Cu
r
r
ent
- I
(mA)
Reverse Voltage - V (V)
T = 175C
J
100
1000
10000
0
10
20
30
40
50
R
T
J
u
n
c
t
i
o
n
Ca
p
a
c
i
t
a
n
c
e
- C
(
p
F
)
T = 25C
J
Reverse Voltage - V (V)
0.001
0.01
0.1
1
0.00001
0.0001
0.001
0.01
0.1
1
10
100
D = 0.33
D = 0.50
D = 0.25
D = 0.17
D = 0.08
1
th
J
C
t , Rectangular Pulse Duration (Seconds)
T
h
er
mal
I
m
p
e
d
a
n
c
e
- Z
(C
/
W
)
Single Pulse
(Thermal Resistance)
J
DM
thJC
C
2
t
1
t
P
DM
1
2
Notes:
1. Duty factor D = t / t
2. Peak T = P x Z + T
85HQ... Series
4
Bulletin PD-2.247 rev. B 11/02
www.irf.com
Fig. 5 - Maximum Allowable Case Temperature
Vs. Average Forward Current
Fig. 8 - Unclamped Inductive Test Circuit
Fig. 6 - Forward Power Loss Characteristics
Fig. 7 - Maximum Non-Repetitive Surge Current
FREE-WHEEL
DIODE
40HFL40S02
CURRENT
MONITOR
HIGH-SPEED
SWITCH
IRFP460
L
DUT
Rg = 25 ohm
Vd = 25 Volt
+
100
120
140
160
180
0
20
40
60
80
100 120 140
DC
Al
l
o
w
a
bl
e Cas
e
T
e
m
p
er
at
u
r
e
- (
C)
F(AV)
Average Forward Current - I (A)
R (DC) = 0.83C/W
thJC
0
10
20
30
40
50
60
70
80
0
25
50
75
100
125
DC
Av
e
r
age P
o
w
e
r
L
o
s
s
- (
W
a
t
t
s
)
F(AV)
D = 0.08
D = 0.17
D = 0.25
D = 0.33
D = 0.50
RMS Limit
Average Forward Current - I (A)
100
1000
10000
10
100
1000
10000
FS
M
p
Non
-
R
e
p
e
t
i
t
i
v
e
S
u
r
g
e Cu
r
r
en
t
- I
(A
)
At Any Rated Load Condition
And With Rated V Applied
Following Surge
RRM
Square Wave Pulse Duration - t (microsec)
85HQ... Series
5
Bulletin PD-2.247 rev. B 11/02
www.irf.com
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. 11/02
Data and specifications subject to change without notice.
This product has been designed for Industrial Level.
Qualification Standards can be found on IR's Web site.
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