Thyristors
55 Amp Standard SCRs
RoHS
SK255KD
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
550 A
Agency Recognitions
Agency
Agency File Number
E71639
• Electrically isolated
package “KD -Package”
and UL Recognized for
2500V
RMS
Applications
Typical applications are AC solid-state switches, industrial
power tools, line rectification 50/60Hz.
Main Features
Symbol
I
T(RMS)
V
DRM
/V
RRM
I
GT
Value
55
1200
50
Unit
A
V
mA
Schematic Symbol
A
K
G
Absolute Maximum Ratings
Symbol
V
DRM
/V
RRM
V
DSM
/V
RSM
I
T(RMS)
I
T(AV)
I
TSM
I
2
t
di/dt
I
GM
P
G(AV)
T
stg
T
J
Parameter
Repetitive Peak off-state/Reverse Voltage
Non-repetitive peak off-state/Reverse voltage
RMS on-state current
Average on-state current
T
C
= 60°C
T
C
= 60°C
single half cycle; f = 50Hz;
T
J
(initial) = 25°C
single half cycle; f = 60Hz;
T
J
(initial) = 25°C
t
p
= 8.3 ms
T
J
= 125°C
T
J
= 125°C
Test Conditions
Value
1200
1300
55
35
520
A
620
1620
150
3
1
-40 to 150
-40 to 125
A
2
s
A/μs
A
W
°C
°C
Unit
V
V
A
A
Peak non-repetitive surge current
I
2
t Value for fusing
Critical rate of rise of on-state current
Peak gate current
Average gate power dissipation
Storage temperature range
Operating junction temperature range
SK255KD
©2017 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 01/29/18
Thyristors
55 Amp Standard SCRs
Electrical Characteristics
(T
J
= 25°C, unless otherwise specified)
Symbol
I
GT
V
GT
dv/dt
V
GD
I
H
t
q
t
gt
Test Conditions
V
D
= 12V; R
L
= 30
Ω
V
D
= 2/3 V
DRM
; gate open; T
J
= 125°C
V
D
= V
DRM
; R
L
= 3.3 kΩ; T
J
= 125°C
I
T
= 500mA (initial)
I
T
=0.5A; t
p
=50µs; dv/dt=5V/µs; di/dt=-30A/µs
I
G
= 2 x I
GT
; PW = 15µs; I
T
= 110A
MAX.
MAX.
MIN.
MIN.
MAX.
TYP
.
TYP
.
Value
50
1.5
2000
0.2
120
20
3
Unit
mA
V
V/μs
V
mA
μs
μs
Static Characteristics
Symbol
V
TM
I
DRM
/ I
RRM
Test Conditions
I
T
= 110A; t
p
= 380μs
V
DRM
/ V
RRM
T
J
= 25°C
T
J
= 125°C
MAX.
MAX.
Value
1.6
10
6
Unit
V
μA
mA
Thermal Resistances
Symbol
R
θ(J-C)
Junction to case (AC)
Parameter
Value
1.0
°C/W
Unit
Figure 1: Normalized DC Gate Trigger Current
vs. Junction Temperature
2.0
Figure 2: Normalized DC Gate Trigger Voltage
vs. Junction Temperature
2.5
1.6
Ration of V
GT
/V
GT
(T
J
= 25
o
C)
Ration of I
GT
/I
GT
(T
J
= 25
o
C)
2.0
1.2
1.5
0.8
1.0
0.4
0.5
0.0
0.0
-40
-15
10
35
60
85
110 125
-40
-15
10
35
60
85
110 125
Junction Temperature (T
J
)-(
o
C)
Junction Temperature (T
J
)-(
o
C)
SK255KD
©2017 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 01/29/18
Thyristors
55 Amp Standard SCRs
Figure 3: Normalized DC Holding Current
vs. Junction Temperature
2.0
Figure 4: On-State Current vs. On-State Voltage
(Typical)
160
Intantaneous On-state Current (iT) – Amps
140
120
100
80
60
40
20
0
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 (v
T
) – Volts
1.6
Ration of I
H
/I
H
(T
J
= 25
o
C)
1.2
0.8
0.4
0.0
-40
-15
10
35
60
85
110 125
Junction Temperature (T
J
)-(
o
C)
Figure 5: Power Dissipation (Typical)
vs. RMS On-State Current
60
Figure 6: Maximum Allowable Case Temperature
vs. RMS On-State Current
Maximum Allowable Case Temperature (T
C
) - °C
130
120
110
100
90
80
70
60
50
40
0
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
Average On-State Power Dissipation
[
P
D(AV
)
] - (Watts)
50
40
30
20
10
0
0
5
10 15 20 25 30 35 40 45 50 55
RMS On-State Current [I
T(RMS)
] - (Amps)
10
20
30
40
50
60
RMS On-State Current [I
T(RMS)
] - Amps
Figure 7: Maximum Allowable Case Temperature
vs. Average On-State Current
130
Maximum Allowable Case Temperature
(T
C
) - °C
120
110
100
90
80
70
60
50
40
0
CURRENT WAVEFORM: Sinusoidal
LOAD: Resistive or Inductive
CONDUCTION ANGLE: 180°
5
10
15
20
25
30
35
40
©2017 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 01/29/18
Average On-State Current [I
T(AVE)
] - Amps
SK255KD
Thyristors
55 Amp Standard SCRs
Figure 8: Surge Peak On-State Current vs. Number of Cycles
560
Peak Surge (Non-repetitive)
On-state Current (I
TSM
) – Amps
480
400
320
240
160
80
0
1
10
100
tp=10ms
One cycle
SUPPLY FREQUENCY: 50 Hz Sinusoidal
LOAD: Resistive
RMS On-State Current: [I
T(RMS)
]: Maximum Rated
Value at Specified Case Temperature
Notes:
1. Gate control may be lost during and immediately
following surge current interval.
2. Overload may not be repeated until junction
temperature has returned to steady-state
rated value.
1000
Surge Current Duration - Full Cycles
Design Considerations
Careful selection of the correct component 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 component 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.
Environmental Specifications
Test
AC Blocking
Temperature Cycling
Temperature/
Humidity
Resistance to
Solder Heat
Solderability
Specifications and Conditions
JESD22-A108C, 80% V
DRM
@125°C for 168
hours
JESD22-A104D, M-1051,
50 cycles; -50°C to +150°C;
15-min dwell-time
EIA / JEDEC, JESD22-A101
168 hours; 100V - DC: 85°C;
85% rel humidity
JESD22-B106C
ANSI/J-STD-002, category 3, Test A
Dimensions – TO-218AC (KD Package) — Isolated Mounting Tab Common with Center Lead
R
2-
5
0.
Dimension
A
Millimeters
Min.
4.40
1.45
14.35
0.50
2.70
15.80
20.40
15.10
5.40
1.10
1.35
2.80
4.35
Typ.
Max.
4.60
1.55
15.60
0.70
2.90
16.50
21.10
15.50
5.65
1.40
1.50
3.00
Min.
0.173
0.057
0.565
0.020
0.106
0.622
0.803
0.594
0.213
0.043
0.053
0.110
Inches
Typ.
Max.
0.181
0.061
0.614
0.028
0.114
0.650
0.831
0.610
0.222
0.055
0.059
0.118
0.171
©2017 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 01/29/18
H
Φ
M
4
ax
.
m
2m
A
B
B
C
D
E
F
G
H
J
K
D
Note: Maximum torque to
be applied to mounting tab
is 7 in-lbs. (0.8 Nm).
R
F
G
P
L
C
CATHODE ANODE
E
GATE
K
J
L
P
R
SK255KD
Thyristors
55 Amp Standard SCRs
Product Selector
Part Number
SK255KD
Gate Sensitivity
50mA
Type
Standard SCR
Package
TO-218AC
Packing Options
Part Number
SK255KDTP
Marking
SK255KD
Weight
4.8g
Packing Mode
Tube
Base Quantity
450 (30 per tube)
Part Numbering System
Part Marking System
S K2 55 KD TP
DEVICE TYPE
S: SCR
PACKAGING TYPE
TP: Tube Pack
SK255KD
YMMXXX
VOLTAGE RATING
K2: 1200V
K6: 1600V
PACKAGE TYPE
KD: TO-218AC (isolated)
CURRENT RATING
55: 55A
®
Date Code Marking
Y:Year Code
MM: Month Code
XXX: Lot Serial Code
Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and
test each product selected for their own applications. Littelfuse products are not designed for, and may not be used in, all applications.
Read complete Disclaimer Notice at
www.littelfuse.com/disclaimer-electronics.
SK255KD
©2017 Littelfuse, Inc
Specifications are subject to change without notice.
Revised: 01/29/18
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