Reduced RFI and EMI
Reduced Snubbing
Extensive Characterization of
Recovery Parameters
Features
Description
HEXFREDTM
diodes are optimized to reduce losses and EMI/RFI in high frequency
power conditioning systems. An extensive characterization of the recovery
behavior for different values of current, temperature and di/dt simplifies the
calculations of losses in the operating conditions. The softness of the recovery
eliminates the need for a snubber in most applications. These devices are
ideally suited for power converters, motors drives and other applications where
switching losses are significant portion of the total losses.
Ultrafast, Soft Recovery DiodeHEXFREDTM
HFA240NJ40C
BASE C O MMO N C ATHO DE
LUG
TERMINAL
AN O DE 1
LUG
TERMINA
L
ANOD E 2
PD -2.453 rev. B 02/99
VR = 400V
VF(typ.) = 1V
IF(AV) = 240A
Qrr (typ.) = 290nC
IRRM(typ.) = 7.5A
trr(typ.) = 50ns
di(rec)M/dt (typ.) = 270A/µs
TO-244AB
Thermal - Mechanical Characteristics
Absolute Maximum Ratings (per Leg)
lbfin
(Nm)
°C/W
K/W
Parameter Min. Typ. Max. Units
RthJC Junction-to-Case, Single Leg Conducting   0.27
Junction-to-Case, Both Legs Conducting   0.14
RthCS Case-to-Sink, Flat, Greased Surface  0.10 
Wt Weight  79 (2.8)  g (oz)
Mounting Torque 30 (3.4)  40 (4.6)
Mounting Torque Center Hole 12 (1.4)  18 (2.1)
Terminal Torque 30 (3.4)  40 (4.6)
Vertical Pull   80
2 inch Lever Pull   35
Parameter Max. Units
VRCathode-to-Anode Voltage 400 V
IF @ TC = 25°C Continuous Forward Current 244
IF @ TC = 100°C Continuous Forward Current 122
IFSM Single Pulse Forward Current 900
EAS Non-Repetitive Avalanche Energy 1.4 mJ
PD @ TC = 25°C Maximum Power Dissipation 460
PD @ TC = 100°C Maximum Power Dissipation 185
TJOperating Junction and
TSTG Storage Temperature Range -55 to +150
W
A
C
lbfin
Note: Limited by junction temperature Mounting surface must be smooth, flat, free or burrs or other
L = 100µH, duty cycle limited by max TJprotrusions. Apply a thin even film or thermal grease to mounting
125°C surface. Gradually tighten each mounting bolt in 5-10 lbfin steps
until desired or maximum torque limits are reached. Module
1
HFA240NJ40C
PD-2.453 rev. B 02/99
2
Parameter Min. Typ. Max. Units Test Conditions
VBR Cathode Anode Breakdown Voltage 400   V IR = 100µA
VFM Max Forward Voltage  1.1 1.3 IF = 120A
 1.3 1.5 V IF = 240A See Fig. 1
 1.0 1.2 IF = 120A, TJ = 125°C
IRM Max Reverse Leakage Current  1.5 9.0 µA VR = VR Rated
 2.3 12 mA TJ = 125°C, VR = 320V
CTJunction Capacitance  280 380 pF VR = 200V See Fig. 3
From top of terminal hole to mounting
plane
Electrical Characteristics (per Leg) @ TJ = 25°C (unless otherwise specified)
Dynamic Recovery Characteristics (per Leg) @ TJ = 25°C (unless otherwise specified)
A/µs
nC
A
LSSeries Inductance  6.0  nH
See Fig. 2
Parameter Min. Typ. Max. Units Test Conditions
trr Reverse Recovery Time  50  IF = 1.0A, dif /dt = 200A/µs, VR = 30V
trr1  77 120 ns TJ = 25°C See Fig.
trr2  290 440 TJ = 125°C 5 IF = 120A
IRRM1 Peak Recovery Current  7.5 14 TJ = 25°C See Fig.
IRRM2  16 30 TJ = 125°C 6 VR = 200V
Qrr1 Reverse Recovery Charge  290 780 TJ = 25°C See Fig.
Qrr2  2300 6300 TJ = 125°C 7 dif /dt = 200A/µs
di(rec)M/dt1 Peak Rate of Fall of Recovery Current  320  TJ = 25°C See Fig.
di(rec)M/dt2 During tb 270  TJ = 125°C 8
63.50 (2.500)
60.96 (2.400)
23.55 (0.927)
20.42 (0.804) 14.99 (0.590)
15.75 (0.620)
20.32 (0.800)
17.78 (0.700)
39.75 (1.565)
40.26 (1.585)
80.01 (3.150)
34.925 (1.375)
3.35 (0.132)
3.02 (0.119)
90.17 (3.550)
92.71 (3.650)
DIA.
7.49 (0.295)
6.99 (0.275)
(2 PLCS.)
10.41 (0.410)
9.65 (0.380)
DIA.
DIA.
4.70 (0.185)
4.95 (0.195)
1/4-20 SLOTTED HEX
REF.
Di m ensions in M illimeters and (Inches)
CONFORMS TO JEDEC
OUTLINE TO-244AB
1
2
3
LEAD ASSIGNMENTS
1 - ANODE
2 - CATHODE
3 - ANODE
HFA240NJ40C
PD-2.453 rev. B 02/99
3
Fig. 4 - Maximum Thermal Impedance ZthJC Characteristics, (per Leg)
Fig. 2 - Typical Reverse Current vs. Reverse
Voltage, (per Leg)
Fig. 3 - Typical Junction Capacitance vs.
Reverse Voltage, (per Leg)
Fig. 1 - Maximum Forward Voltage Drop
vs. Instantaneous Forward Current,
(per Leg)
0.1
1
10
100
1000
10000
100000
0 100 200 300 400
R
R
Reverse Voltage - V (V)
T = 150°C
Reverse Current - I (µA)
T = 125°C
T = 25°C
J
J
J
100
1000
10000
1 10 100 1000
T = 25°C
J
Reverse Voltage - V (V)
R
T
Junction Capacitance - C (pF)
A
0.001
0.01
0.1
1
0.00001 0.0001 0.001 0.01 0.1 1 10 100
1
thJC
t , Recta ngular Pul se Durati on (Seconds)
D = 0.50
D = 0.33
D = 0.25
D = 0. 17
D = 0. 08
Sin gle Pulse
(Thermal Resistance)
Thermal Im pedance - Z (K/ W )
2
t
1
t
P
DM
Notes:
1. Duty factor D = t / t
2. Peak T = P x Z + T
J
DM thJC
C
21
1
10
100
1000
0.4 0.8 1.2 1.6 2.0
FM
F
Instantaneous Forward Current - I (A)
Forward Voltage Drop - V (V)
T = 1 50°C
T = 125°C
T = 25°C
J
J
J
HFA240NJ40C
PD-2.453 rev. B 02/99
4
Fig. 7 - Typical Stored Charge vs. dif/dt,
(per Leg)
Fig. 8 - Typical di(rec)M/dt vs. dif/dt,
(per Leg)
Fig. 5 - Typical Reverse Recovery vs. dif/dt,
(per Leg)
Fig. 6 - Typical Recovery Current vs. dif/dt,
(per Leg)
0
100
200
300
400
500
100 1000
f
di /dt - (A/µs)
t - (ns)
rr
I = 200A
I = 50A
I =120A
V = 200V
T = 125°C
T = 25°C
R
J
J
F
F
F
1
10
100
100 1000
f
di /dt - (A/µs)
I - (A)
IRRM
I = 200A
I = 50A
I = 120A
V = 200V
T = 125°C
T = 25°C
R
J
J
F
F
F
100
1000
10000
100 1000
f
di /dt - (A/µs)
di(rec)M/dt - (A/µs)
I = 5 0A I = 200A
I = 120A
V = 200V
T = 125°C
T = 25°C
R
J
J
F
F
F
0
2000
4000
6000
100 1000
f
di /dt - (A/µs)
RR
Q - (nC)
I = 50A
I = 200A
I = 120A
V = 200 V
T = 125°C
T = 25°C
R
J
J
F
F
F
HFA240NJ40C
PD-2.453 rev. B 02/99
5
4. Qrr - Area under curve defined by trr
and IRRM
trr X IRRM
Qrr =
2
5. di(rec)M/dt - Peak rate of change of
current during tb portion of trr
V
(AVAL)
R(RATED)
I
L(PK)
V
DECAY
TIME
Fig. 11 - Avalanche Test Circuit and Waveforms
Fig. 10 - Reverse Recovery Waveform and
Definitions
Fig. 9 - Reverse Recovery Parameter Test
Circuit
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
1. dif/dt - Rate of change of current
through zero crossing
2. IRRM
- Peak reverse recovery current
3. trr - Reverse recovery time measured
from zero crossing point of negative
going IF to point where a line passing
through 0.75 IRRM and 0.50 IRRM
extrapolated to zero current
REVERSE RECOVERY CIRCUIT
IRFP250
D.U.T.
L = 70µH
V = 2 00V
R
0.01
Ω
G
D
S
dif/dt
ADJUST
CURRENT
MONITOR
HIGH-SPEED
SWITCH
DUT
Rg = 25 ohm +
FREE-WHEEL
DIODE
Vd = 5 0 V
L = 100µH
http://www.irf.com Fax-On-Demand: +44 1883 733420 Data and specifications subject to change without notice.
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