Teccor® brand Thyristors
25 Amp Standard SCRs
SK225xD Series
RoHS
Description
Excellent unidirectional switches for phase control
applications such as heating and motor speed controls.
Standard phase control SCRs are triggered with few
milliamperes of current at less than 1.5V potential.
Features & Benefits
• RoHS compliant
• Voltage capability up
to 1200 V
• Surge capability up to
300 A
Applications
Agency Approval
Agency
• Electrically isolated
package “LD -Package”
and UL recognized for
2500VRMS
Typical applications are AC solid-state switches, industrial
power tools, line rectification 50/60Hz.
Agency File Number
Internally constructed isolated packages are offered for
ease of heat sinking with highest isolation voltage.
E71639
Main Features
Schematic Symbol
Symbol
IT(RMS)
VDRM /VRRM
IGT
Value
Unit
25
A
1200
V
40
mA
A
K
G
SK225xD Series
©2015 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 08/20/15
Teccor® brand Thyristors
25 Amp Standard SCRs
Absolute Maximum Ratings — 25A SCR
Symbol
Parameter
Test Conditions
VDRM /VRRM
Repetitive Peak off-state/Reverse Voltage
VDSM/VRSM
Non-repetitive peak off-state/Reverse voltage
IT(RMS)
RMS on-state current
IT(AV)
Average on-state current
ITSM
Peak non-repetitive surge current
I 2t
I2t Value for fusing
di/dt
SK225RD
TC=95°C
SK225LD
TC=75°C
SK225RD
TC=95°C
V
1300
V
25
A
16
A
single half cycle; f = 50Hz;
TJ (initial) = 25°C
300
single half cycle; f = 60Hz;
TJ (initial) = 25°C
360
tp = 8.3 ms
540
A 2s
50
A/μs
3
A
Peak gate current
TJ = 125°C
Average gate power dissipation
A
TJ = 125°C
1
W
Storage temperature range
-40 to 150
°C
Operating junction temperature range
-40 to 125
°C
Tstg
TJ
TC=75°C
Unit
1200
Critical rate of rise of on-state current
IGM
PG(AV)
SK225LD
Value
Notes :
x = package
Electrical Characteristics (TJ = 25°C, unless otherwise specified)
Symbol
IGT
VGT
Test Conditions
Value
Unit
40
mA
MAX.
VD = 12V; RL = 30Ω
MAX.
1.5
V
MIN.
1000
V/μs
dv/dt
VD = 2/3 VDRM; gate open; TJ = 125°C
VGD
VD = VDRM; RL = 3.3 kΩ; TJ = 125°C
MIN.
0.2
V
IH
IT = 500mA (initial)
MAX.
100
mA
TYP.
15
μs
TYP.
3
μs
Value
Unit
1.6
V
IT=0.5A; tp=50µs; dv/dt=5V/µs; di/dt=-30A/µs
tq
IG = 2 x IGT; PW = 15µs; IT = 50A
tgt
Notes :
x = package
Static Characteristics
Symbol
VTM
IDRM / IRRM
Test Conditions
IT = 50A; tp = 380μs
MAX.
TJ = 25°C
VDRM / VRRM
TJ = 125°C
MAX.
10
μA
4
mA
Thermal Resistances
Symbol
Rθ(J-C)
SK225xD Series
Parameter
Junction to case (AC)
Value
SK225RD
1.0
SK225LD
1.9
Unit
°C/W
©2015 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 08/20/15
Teccor® brand Thyristors
25 Amp Standard SCRs
Figure 1: Normalized DC Gate Trigger Current
vs. Junction Temperature
Figure 2: N
ormalized DC Gate Trigger Voltage
vs. Junction Temperature
2.5
2.0
1.6
Ration of VGT /VGT (TJ=125o C)
Ration of IGT /IGT (TJ =125o C)
2.0
1.5
1.0
0.5
0.0
1.2
0.8
0.4
-40
-15
10
35
60
85
0.0
110 125
Junction Temperature (TJ)-(o C)
Intantaneous On-state Current (iT) – Amps
Ration of I H /IH (TJ=125o C)
1.2
0.8
0.4
-40
-15
10
35
60
85
85
110
70
60
50
40
30
20
10
0
110 125
Figure 6: M
aximum Allowable Case Temperature
vs. RMS On-State Current
Maximum Allowable Case Temperature (TC) - °C
30
25
20
15
10
5
5
10
15
0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9
Instantaneous On-state Voltage (vT) – Volts
Figure 5: Power Dissipation (Typical)
vs. RMS On-State Current
Average On-State Power Dissipation
[PD(AV)] - (Watts)
60
80
Junction Temperature (TJ)-(o C)
20
RMS On-State Current [IT(RMS)] - (Amps)
SK225xD Series
35
90
1.6
0
10
Figure 4: O
n-State Current vs. On-State
Voltage (Typical)
2.0
0
-15
Junction Temperature (TJ)-(o C)
Figure 3: Normalized DC Holding Current
vs. Junction Temperature
0.0
-40
25
130
120
SK225RD
110
100
90
SK225LD
80
70
60
50
40
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
0
10
20
30
RMS On-State Current [IT(RMS)] - Amps
©2015 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 08/20/15
Teccor® brand Thyristors
25 Amp Standard SCRs
Maximum Allowable Case Temperature (TC) - °C
Figure 7: Maximum Allowable Case Temperature
vs. Average On-State Current
130
SK225RD
120
110
100
90
SK225LD
80
70
60
50
40
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
0
2
4
6
8
10
12
14
16
18
Average On-State Current [IT(AVE)] - Amps
Peak Surge (Non-repetitive)On-state Current
(ITSM) – Amps
Figure 8: Surge Peak On-State Current vs. Number of Cycles
350
SUPPLY FREQUENCY: 50 Hz Sinusoidal
LOAD: Resistive
RMS On-State Current: [IT(RMS)]: Maximum Rated
Value at Specified Case Temperature
tp=10ms
One cycle
300
250
Notes:
1. G
ate control may be lost during and immediately
following surge current interval.
2. O
verload may not be repeated until junction
temperature has returned to steady-state
rated value.
200
150
100
50
0
1
10
100
1000
Surge Current Duration - Full Cycles
Environmental Specifications
Test
AC Blocking
Temperature Cycling
Temperature/
Humidity
Specifications and Conditions
JESD22-A108C, 80% VDRM @125°C for 168
hours
MIL-STD-750, M-1051,
100 cycles; -40°C to +150°C;
15-min dwell-time
EIA / JEDEC, JESD22-A101
168 hours; 100V - DC: 85°C;
85% rel humidity
Resistance to
Solder Heat
JESD22-B106C
Solderability
J-STD-022, category 3, test A
SK225xD Series
Design Considerations
Careful selection of the correct device for the application’s
operating parameters and environment will go a long way
toward extending the operating life of the Thyristor. Good
design practice should limit the maximum continuous
current through the main terminals to 75% of the device
rating. Other ways to ensure long life for a power discrete
semiconductor are proper heat sinking and selection of
voltage ratings for worst case conditions. Overheating,
overvoltage (including dv/dt), and surge currents are
the main killers of semiconductors. Correct mounting,
soldering, and forming of the leads also help protect
against component damage.
©2015 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 08/20/15
Teccor® brand Thyristors
25 Amp Standard SCRs
Dimensions — TO-220AB (RD-Package) — Non-Isolated Mounting Tab Common with Center Lead
Dimension
ax
E
m
8m
3.
ØM
A
H
D
V1
L3
F
C2
L1
C3
L2
Note: Maximum torque to
be applied to mounting tab
is 3 in-lbs (0.3Nm).
Min.
Typ.
Max.
4.40
4.60
0.173
0.181
0.61
0.88
0.024
0.035
C
0.46
0.70
0.018
0.028
C2
1.21
1.32
0.048
0.052
C3
2.40
2.72
0.094
0.107
D
8.60
9.70
0.339
0.382
E
9.60
10.4
0.378
0.409
F
6.20
6.60
0.244
0.260
29.8
1.102
1.70
0.045
2.95
0.104
2.54
28.0
L1
C
Inches
Max.
B
G
B
Typ.
A
H
G
Millimeters
Min.
0.1
3.75
L2
1.14
L3
2.65
V1
1.173
0.148
45°
0.067
0.116
45°
Dimensions — TO-220AB (LD-Package) — Isolated Mounting Tab
Dimension
ax
E
3.
C2
D
V1
L3
H
L1
C3
L2
Min.
4.40
4.60
0.173
B
0.61
0.88
0.024
0.035
C
0.46
0.70
0.018
0.028
B
SK225xD Series
0.181
1.21
1.32
0.048
0.052
2.40
2.72
0.094
0.107
D
8.60
9.70
0.339
0.382
E
9.80
10.4
0.386
0.409
F
6.55
6.95
0.258
2.54
28.0
L1
Note: Maximum torque to
be applied to mounting tab
is 7 in-lbs. (0.8 Nm).
Max.
C3
G
C
Typ.
C2
H
G
Typ.
Inches
Max.
A
A
F
ØM
m
8m
Millimeters
Min.
29.8
1.102
3.75
1.14
1.70
0.045
L3
2.65
2.95
0.104
45°
1.173
0.148
L2
V1
0.274
0.1
0.067
0.116
45°
©2015 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 08/20/15
Teccor® brand Thyristors
25 Amp Standard SCRs
Product Selector
Gate Sensitivity
Type
Package
SK225LD
Part Number
40mA
Standard SCR
TO-220L
SK225RD
40mA
Standard SCR
TO-220R
Packing Options
Marking
Weight
Packing Mode
Base Quantity
SK225LDTP
Part Number
SK225LD
2.2g
Tube
1000
SK225RDTP
SK225RD
2.0g
Tube
1000
Part Numbering System
Part Marking System
S K2 25 LD TP
DEVICE TYPE
S: SCR
PACKAGING TYPE
TP: Tube Pack
SK225RD
YMMXXX
VOLTAGE RATING
K2: 1200V
CURRENT RATING
25: 25A
®
PACKAGE TYPE
LD: TO-220 Isolated
RD: TO-220 Non-Isolated
Date Code Marking
Y:Year Code
MM: Month Code
XXX: Lot Trace Code
SK225xD Series
©2015 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 08/20/15