TELECOMMUNICATIONS
I S O L AT I O N T R A N S F O R M E R S — S U R FA C E - M O U N T
SMPT-3xx:
Surface-mount Isolation Transformer
All dimensions are ±0.005 unless otherwise noted.
All dimensions are in inches.
Part #
(Note 1)
Turns Ratio
Impedance Match
(Ohms)
Inductance
(mH Min.)
Leakage Inductance
(µH Max.)
Capacitance
(pF Max.)
Notes
SMPT-301
SMPT-302
SMPT-304
SMPT-305
SMPT-306
SMPT-307
SMPT-309
SMPT-310
SMPT-311
SMPT-312
SMPT-313
SMPT-314
SMPT-315
SMPT-317
SMPT-318
SMPT-319
SMPT-320
SMPT-321
SMPT-322
SMPT-323
SMPT-324
1:1.15CT
1:1:1.26
2CT:1CT
1:1.26CS
1:2CT
2CS:1.58
-
1:1:1.26
1:1.36CT
1CT:1
1CT:2CT
1CT:2CT
1CT:1CT
1:1.5
1:2.4
1:1.41
1:2.3
1:1.18
1.26CT:1
1:1
1CT:3CT
75 to 100
75 to 75/120
-
75 to 120
-
-
150 to 75/120
75 to 75/120
-
-
-
-
-
-
-
-
-
-
75 to 120
-
-
1.5
1.5
2.0
1.5
1.2
1.5
1.6
1.6
1.2
1.2
1.2
0.9
1.8
1.2
1.2
1.2
1.2
1.2
1.2
1.2
1.2
0.6
0.4
1.8
1.1
0.5
0.6
0.73
0.48
0.6
0.6
0.6
0.6
0.7
0.6
0.6
0.6
0.6
0.6
0.6
0.6
0.5
35
35
19
20
40
30
14
14
35
35
30
35
35
35
35
35
35
35
35
25
45
5
2
4, 5
6
6
7
3
5
5
5
Notes:
1. Part numbers be modified as follows:
SMPT-3xxET indicates -40°C to +85°C operation
SMPT-3xx-S meets UL1950 supplementary insulation requirements, 250V
SMPT-3xx-R meets UL1950 reinforced insulation requirements
2. This transformer provides two turns ratios. Use pins 3-5 for 1:1, use pins 1-5 for 1:1.26.
3. This transformer provides two turns ratios. Use pins 2-4 for 1:1, use pins 2-6 for 1:1.26.
4. Note polarity markings on the schematic.
5. This part is designed to withstand DC fault current of 1.95A indefinitely with no dielectric
degradation.
6. "CS" indicates split center winding.
7. This transformer provides two impedance matching turns ratios. Pins 1-5 are for a 150 ohm
primary. Pins 2-5 are a 75 ohms secondary, and pins 2-6 are a 120 ohm secondary.
5
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