Features
Description
t
rr
= 28ns
I
F(AV)
= 120A
@ T
C
= 90C
V
R
= 200V
1
UFB120FA20
Bulletin PD-20487 12/01
Insulated Ultrafast Rectifier Module
V
R
Cathode-to-Anode Voltage
200
V
I
F
Continuous Forward Current, T
C
= 90C
Per Diode
60
A
I
FSM
Single Pulse Forward Current, T
C
= 25C
Per Diode
850
P
D
Max. Power Dissipation, T
C
= 90C
Per Module
110
W
V
ISOL
RMS Isolation Voltage, Any Terminal to Case, t = 1 min
2500
V
T
J
,
T
STG
Operating Junction and Storage Temperatures
- 55 to 150
C
Parameters
Max
Units
Absolute Maximum Ratings
Two Fully Independent Diodes
Ceramic Fully Insulated Package (V
ISOL
= 2500V AC)
Ultrafast Reverse Recovery
Ultrasoft Reverse Recovery Current Shape
Low Forward Voltage
Optimized for Power Conversion: Welding and Industrial SMPS Applications
Industry Standard Outline
Plug-in Compatible with other SOT-227 Packages
Easy to Assemble
Direct Mounting to Heatsink
The UFB120FA20 insulated modules integrate two state-of-the-art International Rectifier's Ultrafast recovery rectifiers
in the compact, industry standard SOT-227 package. The planar structure of the diodes, and the platinum doping life-
time control, provide a Ultrasoft recovery current shape, together with the best overall performance, ruggedness and
reliability characteristics.
These devices are thus intended for high frequency applications in which the switching energy is designed not to be
predominant portion of the total energy, such as in the output rectification stage of Welding machines, SMPS, DC-
DC converters. Their extremely optimized stored charge and low recovery current reduce both over dissipation in the
switching elements (and snubbers) and EMI/ RFI.
Case Styles
UFB120FA20
SOT-227
www.irf.com
2
1
4
3
UFB120FA20
Bulletin PD-20487 12/01
2
www.irf.com
V
BR
Cathode Anode
200
-
-
V
I
R
= 100A
Breakdown Voltage
V
FM
Forward Voltage
-
0.96 1.13
V
I
F
= 60A
-
0.79 0.90
V
I
F
= 60A, T
J
= 150C
I
RM
Reverse Leakage Current
-
-
100
A
V
R
= V
R
Rated
-
-
1.0
mA
T
J
= 150C, V
R
= V
R
Rated
C
T
Junction Capacitance
-
105
-
pF
V
R
= 200V
Electrical Characteristics @ T
J
= 25C (unless otherwise specified) per diode
Parameters
Min Typ Max Units Test Conditions
R
thJC
Junction to Case
Single Diode Conducting
-
0.8
1.1
K/W
Both Diodes Conducting
-
0.4
0.55
R
thCS
Case to Heat Sink, Flat, Greased Surface
-
0.05
-
Wt
Weight
-
30
-
g
T
Mounting Torque
-
1.3
-
(N*m)
Parameters
Min
Typ
Max
Units
Thermal - Mechanical Characteristics
t
rr
Reverse Recovery Time
-
-
28
ns
I
F
= 1.0A, di
F
/dt = 200A/s, V
R
= 30V
-
32
-
T
J
= 25C
-
64
-
T
J
= 125C
I
RRM
Peak Recovery Current
-
4.0
-
A
T
J
= 25C
-
8.2
-
T
J
= 125C
Q
rr
Reverse Recovery Charge
-
64
-
nC
T
J
= 25C
-
263
-
T
J
= 125C
Dynamic Recovery Characteristics @ T
J
= 25C (unless otherwise specified) per diode
I
F
= 50A
V
R
= 100V
di
F
/dt = 200A/s
Parameters
Min Typ Max Units Test Conditions
Bulletin PD-20487 12/01
UFB120FA20
3
www.irf.com
Fig. 2 - Typical Values Of Reverse Current
Vs. Reverse Voltage
Fig. 1 - Typical Forward Voltage Drop Characteristics
(per diode)
Fig. 3 - Typical Junction Capacitance
Vs. Reverse Voltage
Forward Voltage Drop - V
FM
(V)
Instantaneous Forward Current - I
F
(A)
Reverse Voltage - V
R
(V)
Reverse Voltage - V
R
(V)
Junction Capacitance - C
T
(pF)
Fig. 4 - Max. Thermal Impedance Z
thJC
(per diode)
t
1
, Rectangular Pulse Duration (Seconds)
Thermal Impedance Z
thJC
(C/W)
Reverse Current - I
R
(A)
1
10
100
1000
0.2
0.6
1
1.4
1.8
Tj = 150C
Tj = 125C
Tj = 25C
0.01
0.1
1
10
0.001
0.01
0.1
1
10
Single Pulse
(Thermal Impedance)
2
t
1
t
P
DM
Notes:
1. Duty factor D = t1/ t2
2. Peak Tj = Pdm x ZthJC + Tc
0.001
0.01
0.1
1
10
100
0
50
100
150
200
125C
25C
Tj = 150C
100
1000
1
10
100
1000
Tj = 25C
UFB120FA20
Bulletin PD-20487 12/01
4
www.irf.com
Fig. 5 - Max. Allowable Case Temperature
Vs. Average Forward Current (per diode)
Fig. 6 - Forward Power Loss (per diode)
(3) Formula used: T
C
= T
J
- (Pd + Pd
REV
) x R
thJC
;
Pd = Forward Power Loss = I
F(AV)
x V
FM
@ (I
F(AV)
/
D) (see Fig. 6);
Pd
REV
= Inverse Power Loss = V
R1
x I
R
(1 - D); I
R
@ V
R1
= 80% rated V
R
Average Power Loss ( Watts )
trr ( ns )
Qrr ( nC )
Average Forward Current - I
F(AV)
(A)
Allowable Case Temperature (C)
Average Forward Current - I
F(AV)
(A)
di
F
/dt (A/s )
di
F
/dt (A/s )
Fig. 8 - Typical Stored Charge vs. di
F
/dt
Fig. 7 - Typical Reverse Recovery time vs. di
F
/dt
80
90
100
110
120
130
140
150
0
10
20
30
40
50
60
70
DC
Square wave (D = 0.50)
80% Rated Vr applied
see note (3)
0
10
20
30
40
50
60
0
10
20
30
40
50
60
70
DC
RMS Limit
D = 0.01
D = 0.02
D = 0.05
D = 0.10
D = 0.20
D = 0.50
0
10
20
30
40
50
60
70
80
100
1000
Tj = 125C
Tj = 25C
If = 50A
Vrr = 200V
0
100
200
300
400
500
600
700
800
100
1000
Tj = 125C
Tj = 25C
If = 50A
Vrr = 200V
Bulletin PD-20487 12/01
UFB120FA20
5
www.irf.com
Fig. 10 - Reverse Recovery Waveform and Definitions
Fig. 9 - Reverse Recovery Parameter Test
Circuit
IRFP250
D.U.T.
L = 70H
V = 200V
R
0.01
G
D
S
dif/dt
ADJUST
4. Q
rr
- Area under curve defined by
t
rr
and I
RRM
5. di
(rec) M
/ dt - Peak rate of change
of current during t
b
portion of t
rr
1. di
F
/dt - Rate of change of current through
zero crossing
2. I
RRM
- Peak reverse recovery current
3. t
rr
- Reverse recovery time measured from
zero crossing point of negative going I
F
to
point where a line passing through 0.75 I
RRM
and 0.50 I
RRM
extrapolated to zero current
Q
rr =
t rr x I
RRM
2
t
a
t
b
t
rr
Q
rr
I
F
I
RRM
I
RRM
0.5
di(rec)M/dt
0.75 I
RRM
5
4
3
2
0
1
di /dt
f
SOT-227 Package Details
1. Dimensioning & tolerancing per ANSI Y14.5M-1982.
2. Controlling dimension: millimeter.
3. Dimensions are shown in millimeters (inches).
Notes:
FRED
LEAD ASSIGNMENTS
UFB120FA20
Bulletin PD-20487 12/01
6
www.irf.com
Tube
QUANTITIES PER TUBE IS 10
M4 SCREW AND WASHER INCLUDED
SOT-227 Package Details
Ordering Information Table
Device Code
1
5
2
4
1
-
ULTRAFAST RECTIFIER
2
-
Ultrafast Pt diffused
3
-
Current Rating
(120 = 120A)
4
-
Circuit Configuration
(2 separate Diodes, parallel pin-out)
5
-
Package Indicator
(SOT-227 Standard Isolated Base)
6
-
Voltage Rating
(20 = 200V)
UF
B
120
F
A
20
6
3
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.
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