S E M I C O N D U C T O R
RURD440, RURD450, RURD460,
RURD440S, RURD450S, RURD460S
4A, 400V - 600V Ultrafast Diodes
Package
JEDEC STYLE TO-251
ANODE
CATHODE
March 1997
Features
• Ultrafast with Soft Recovery . . . . . . . . . . . . . . . . . . . . . .<55ns
• Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . .+175
o
C
• Reverse Voltage Up To . . . . . . . . . . . . . . . . . . . . . . . . . . .600V
• Avalanche Energy Rated
• Planar Construction
CATHODE
(FLANGE)
Applications
• Switching Power Supplies
• Power Switching Circuits
• General Purpose
CATHODE
ANODE
JEDEC STYLE TO-252
CATHODE
(FLANGE)
Description
RURD440, RURD450, RURD460, RURD440S, RURD450S and
RURD460S (TA49035) are ultrafast diodes with soft recovery charac-
teristics (t
RR
< 55ns). They have low forward voltage drop and are sili-
con nitride passivated ion-implanted epitaxial planar construction.
These devices are intended for use as freewheeling/clamping diodes
and rectifiers in a variety of switching power supplies and other power
switching applications. Their low stored charge and ultrafast soft recov-
ery minimize ringing and electrical noise in many power switching cir-
cuits reducing power loss in the switching transistors.
PACKAGING AVAILABILITY
PART NUMBER
RURD440
RURD450
RURD460
RURD440S
RURD450S
RURD460S
PACKAGE
TO-251
TO-251
TO-251
TO-252
TO-252
TO-252
BRAND
RUR440
RUR450
RUR460
RUR440
RUR450
RUR460
Symbol
K
A
NOTE: When ordering, use the entire part number.
T
C
= +25
o
C, Unless Otherwise Specified
RURD440
RURD440S
Peak Repetitive Reverse Voltage . . . . . . . . . . . . . . . . . .V
RRM
Working Peak Reverse Voltage . . . . . . . . . . . . . . . . . . V
RWM
DC Blocking Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
R
Average Rectified Forward Current . . . . . . . . . . . . . . . . I
F(AV)
(T
C
= +160
o
C)
Repetitive Peak Surge Current . . . . . . . . . . . . . . . . . . . . .I
FSM
(Square Wave, 20kHz)
Nonrepetitive Peak Surge Current . . . . . . . . . . . . . . . . . .I
FSM
(Halfwave, 1 phase, 60Hz)
Maximum Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . P
D
Avalanche Energy (L = 40mH) . . . . . . . . . . . . . . . . . . . . E
AVL
Operating and Storage Temperature . . . . . . . . . . . . T
STG
, T
J
Copyright
Absolute Maximum Ratings
RURD450
RURD450S
500
500
500
4
8
40
50
10
-65 to +175
RURD460
RURD460S
600
600
600
4
8
40
50
10
-65 to +175
UNITS
V
V
V
A
A
A
W
mj
o
C
400
400
400
4
8
40
50
10
-65 to +175
©
Harris Corporation 1997
5-25
File Number
3140.3
Specifications RURD440, RURD450, RURD460, RURD440S, RURD450S, RURD460S
Electrical Specifications
T
C
= +25
o
C, Unless Otherwise Specified
LIMITS
TEST
CONDITION
I
F
= 4A, T
C
= +25
o
C
I
F
= 4A, T
C
= +150
o
C
V
R
= 400V, T
C
= +25
o
C
V
R
= 500V, T
C
= +25
o
C
V
R
= 600V, T
C
= +25
o
C
I
R
V
R
= 400V, T
C
= +150
o
C
V
R
= 500V, T
C
= +150
o
C
V
R
= 600V, T
C
= +150
o
C
t
RR
I
F
= 1A, dI
F
/dt = 100A/µs
I
F
= 4A, dI
F
/dt = 100A/µs
t
A
t
B
Q
RR
C
J
R
θJC
DEFINITIONS
V
F
= Instantaneous forward voltage (pw = 300µs, D = 2%).
I
R
= Instantaneous reverse current.
t
RR
= Reverse recovery time (See Figure 2), summation of t
A
+ t
B
.
t
A
= Time to reach peak reverse current (See Figure 2).
t
B
= Time from peak I
RM
to projected zero crossing of I
RM
based on a straight line from peak I
RM
through 25% of I
RM
(See Figure 2).
R
θJC
= Thermal resistance junction to case.
E
AVL
= Controlled avalanche energy (See Figures 9 and 10).
pw = pulse width.
D = duty cycle.
V
1
AMPLITUDE CONTROLS I
F
V
2
AMPLITUDE CONTROLS dI
F
/dt
L
1
= SELF INDUCTANCE OF
R
4
+ L
LOOP
R
1
Q
1
+V
1
0
t
2
t
1
R
2
Q
4
t
3
C1
0
-V
2
R
3
Q
3
-V
4
V
RM
R
4
L
LOOP
DUT
0
0.25 I
RM
I
RM
V
R
RURD440, RURD440S
MIN
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
TYP
-
-
-
-
-
-
-
-
-
-
32
15
50
15
-
MAX
1.5
1.2
100
-
-
500
-
-
55
60
-
-
-
-
3
RURD450, RURD450S
MIN
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
TYP
-
-
-
-
-
-
-
-
-
-
32
15
50
15
-
MAX
1.5
1.2
-
100
-
-
500
-
55
60
-
-
-
-
3
RURD460, RURD460S
MIN
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
TYP
-
-
-
-
-
-
-
-
-
-
32
15
50
15
-
MAX
1.5
1.2
-
-
100
-
-
500
55
60
-
-
-
-
3
UNITS
V
V
µA
µA
µA
µA
µA
µA
ns
ns
ns
ns
nC
pF
o
C/W
SYMBOL
V
F
V
F
I
R
I
F
= 4A, dI
F
/dt = 100A/µs
I
F
= 4A, dI
F
/dt = 100A/µs
I
F
= 4A, dI
F
/dt = 100A/µs
V
R
= 10V, I
F
= 0A
+V
3
Q
2
t
1
≥
5t
A(MAX)
t
2
> t
RR
t
3
> 0
L
1
t
A(MIN)
≤
R
4
10
I
F
dI
F
dt
t
A
t
RR
t
B
FIGURE 1. t
RR
TEST CIRCUIT
FIGURE 2. t
RR
WAVEFORMS AND DEFINITIONS
5-26
RURD440, RURD450, RURD460, RURD440S, RURD450S, RURD460S
Typical Performance Curves
20
I
R
, REVERSE CURRENT (µA)
I
F
, FORWARD CURRENT (A)
500
+175
o
C
10
+175
o
C
100
10
+100 C
o
+100
o
C
1
+25
o
C
1
0.1
+25
o
C
0.5
0.01
0
0.5
1
1.5
2
2.5
0
100
200
300
400
500
600
V
F
, FORWARD VOLTAGE (V)
V
R
, REVERSE VOLTAGE (V)
FIGURE 3. TYPICAL FORWARD CURRENT vs FORWARD
VOLTAGE DROP
T
C
= +25
o
C
FIGURE 4. TYPICAL REVERSE CURRENT vs REVERSE
VOLTAGE
T
C
= +100
o
C
100
50
t, RECOVERY TIMES (ns)
t, RECOVERY TIMES (ns)
40
t
RR
30
t
A
20
t
B
80
t
RR
60
t
A
t
B
20
40
10
0
0.5
1
I
F
, FORWARD CURRENT (A)
4
0
0.5
1
I
F
, FORWARD CURRENT (A)
4
FIGURE 5. TYPICAL t
RR
, t
A
AND t
B
CURVES vs FORWARD
CURRENT
T
C
= +175
o
C
FIGURE 6. TYPICAL t
RR
, t
A
AND t
B
CURVES vs FORWARD
CURRENT
125
t, RECOVERY TIMES (ns)
100
75
t
B
50
t
A
25
0
0.5
1
I
F
, FORWARD CURRENT (A)
t
RR
I
F(AV)
, AVERAGE FORWARD CURRENT (A)
150
5
4
DC
3
SQ. WAVE
2
1
4
0
150
155
160
165
(
o
C)
170
175
T
C
, CASE TEMPERATURE
FIGURE 7. TYPICAL t
RR
, t
A
AND t
B
CURVES vs FORWARD
CURRENT
FIGURE 8. CURRENT DERATING CURVE FOR ALL TYPES
5-27
RURD440, RURD450, RURD460, RURD440S, RURD450S, RURD460S
IMAX = 1A
L = 40mH
R < 0.1Ω
EAVL = 1/2LI
2
[VAVL/(VAVL - V
DD
)]
Q
1
AND Q
2
ARE 1000V MOSFETs
Q
1
L
R
+
V
DD
130Ω
1MΩ
DUT
VAVL
12V
Q
2
130Ω
CURRENT
SENSE
I V
V
DD
I
L
I
L
-
12V
t
0
t
1
t
2
t
FIGURE 9. AVALANCHE ENERGY TEST CIRCUIT
FIGURE 10. AVALANCHE CURRENT AND VOLTAGE
WAVEFORMS
Harris Semiconductor products are sold by description only. Harris Semiconductor reserves the right to make changes in circuit design and/or specifications at
any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Harris is
believed to be accurate and reliable. However, no responsibility is assumed by Harris or its subsidiaries for its use; nor for any infringements of patents or other
rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Harris or its subsidiaries.
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