Pulse Transformer with Double
Secondary Winding
Approvalsn Galvanic separation of drive and power
circuit
n Voltage resistance up to 4kV
n Ignition current up to 1A
n Turns ratio up to 3:1:1
Typical applications
IT pulse transformers are designed to offer
you galvanic isolation for transformer coupled
gate drives. The IT series provides negligible
delays and the possibility of voltage scaling.
They are available with single or double
secondary winding for multiple gate drives.
Choosing the IT product line brings you the
rapid availability of a standard gate drive
transformer. A wide selection on turns ratio,
ignition current and voltages are designed to
offer you the desired standard product.
n Galvanic separation with secondary
winding.
n Voltage resistance up to 4kV.
n Allows high potential difference voltage
scaling.
n Vacuum potting.
n Very low partial discharge effects.
n PCB through hole mounting.
n Custom-specific versions on request.
n Gate drive circuit
n Power supplies
n Power converters
n Frequency converters
n Switching applications
n DC/DC converters
n Line coupling transformers in high-speed
data transmission
Features and benefits
Technical specifications
Nominal operating voltage: Up to 500V
Operating frequency: 40kHz max.
500kHz max. for data transmission
Ignition currents: 0.025 to 1A @ 40°C
Rise time: 0.4 to 4.0µs
Test voltage: Up/50Hz/2s max. according to VDE 110b
Max. partial discharge voltage: 1.5 x Unom
Temperature range (operation and storage): -25°C to +70°C (25/70/21)
Flammability corresponding to: UL 94V-0 listed materials
Typical electrical schematic
prim.
sec. sec.
Pulse Transformers
IT series
Explanations:
– tr rise time at given load resistor R and 70% of the output pulse height.
– Lp primary inductance measured at 1kHz (secondary coile open).
– Lstr stray inductance measured at the secondary side, short circuit at the primary side. If there are several secondary coils only one at the time is connected (measuring frequency 10kHz).
– The ignition current is a set peak value where the voltage drop over the coil resistance is still insignificant (mostly below 1V).
Pulse transformer selection table
IT 143 1:1:1 0.025 500 4 800 0.6 15 200 3 3 10 02 14
IT 242 1:1:1 0.1 500 3.2 250 0.9 2.5 75 0.75 0.75 7 02 6
IT 243 1:1:1 0.1 500 3.2 250 1 2.5 85 0.8 0.8 7 02 6
IT 213 1:1:1 0.25 380 2.5 450 0.4 6.5 20 1.4 1.4 40 02 9
IT 233 1:1:1 0.25 500 4 300 1.3 3 45 0.8 0.8 7 02 13
IT 253 1:1:1 0.25 500 3.2 160 1.3 1.1 45 0.55 0.55 6 02 6
IT 312 1:1:1 0.25 380 2.5 1200 1 21 35 2.4 2.7 30 02 24
IT 313 1:1:1 1 380 2.5 450 0.6 3 6 0.33 0.4 27 02 24
IT 249 2:1:1 0.25 500 3.2 330 4 17 140 3.1 1.5 9 02 6
IT 154 3:1:1 0.1 500 4 600 1.3 75 180 7.5 2.2 9 02 14
IT 244 3:1:1 0.1 500 3.2 200 0.7 15 70 2.8 0.9 9 02 6
IT 234 3:1:1 0.25 500 4 280 1 17 40 2 0.7 9 02 13
IT 314 3:1:1 1 380 2.5 500 1 35 20 1.6 0.7 30 02 25
Pulse transformer Turns ratio Ignition Voltage Voltage Rise Inductance Resistance Coupling Input/Output Weight
current time area time capacitance connections
Iign Unom Up V0t tr Lp Lstr Rp Rs Ck
[A] [V] [kV] [Vµs] [µs] [mH] [µH] [Ω] [Ω] [pF] [g]
Mechanical data
IT 213 IT 243, IT 244, IT 249, IT 253
CD
F
A
HGE
6
12
4
Prim.
H H
3
5
5
21
4
3
6
IT 143, IT 154, IT 233, IT 234
L
C D
F
A
H
G
E
LB
1
3
2
6
Prim.
I5
4
2
4
1
56
3
H
IT 312, IT 313, IT 314
K
C D
F
A
H
G
E
L
B
3
2
4
5
Prim.
I
L
H1 6
4
5
3
2
6 1
L
C D
F
A
H
G
E
L
B
6
4
5
1
Prim.
K2
3
5
3
6
21
4
I
IT 242
L
C D
F
A
H
G
E
L
B
6
4
5
1
Prim.
K2
3
5
3
6
21
4
I
> Components > IT series
Dimensions
IT 213 IT 243 IT 244 IT 249 IT 253 IT 242 IT 143 IT 154 IT 233 IT 234 IT 312 IT 313 IT 314 Tol.
AØ19 17.6 17.6 17.6 17.6 17.6 27* 27* 27* 27* 25.5* 25.5* 25.5* ±0.1
B16.7 16.7 16.7 16.7 16.7 22.5* 22.5* 22.5* 22.5* 25.5* 25.5* 25.5* ±0.1
C20 11.3 11.3 11.3 11.3 11.3 13.7 13.7 13.7 13.7 25* 25* 25* ±0.1
D5555555555555+1/-0
E0.45 0.42 0.42 0.42 0.42 0.42 0.45 0.45 0.45 0.45 0.5 0.5 0.5
F1 0.4 0.4 0.4 0.4 0.4 0.7 0.7 0.7 0.7 0.5 0.5 0.5
G10 15.3 15.3 15.3 15.3 15.3 20 20 20 20 15 15 15
H5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 ±0.2
I2.1 2.1 2.1 2.1 2.1 3.75 3.75 3.75 3.75 5.25 5.25 5.25 ±0.2
K55555 555±0.2
L2 2 2 2 2 2.5 2.5 2.5 2.5 3 3 3
* Tolerance is ±0.2
All dimensions in mm; 1 inch = 25.4mm
Tolerances according: ISO 2768-m / EN 22768-m
> Components > IT series
Your local partner: To find your local partner within Schaffner’s global network, please go to www.schaffner.com May 2011
To find your local partner within
Schaffner‘s global network, please go to
www.schaffner.com
May 2011
© 2011 Schaffner EMC.
Specifications subject to change without
notice. All trademarks recognized.
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Its products are designed and manufac-
tured under the strict quality and environ-
mental requirements of the ISO 9001 and
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This document has been carefully
checked. However, Schaffner does not
assume any liability for errors or inac-
curacies.
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