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Document 193 -1
Miniature SMT Transformers
Designed specifically for use with Maxim RS-232/RS-485
interface ICs, these miniature transformers are also suit-
able for gate drive and other power applications. They were
designed to work with the MAX253 and MAX845 for
providing power to the isolated side of the interface.
They feature 1500 Vrms isolation between windings in a
miniature surface mount package. All transformers have
a plastic cover to aid automated placement.
In addition to the standard parts shown, Coilcraft can
produce custom transformers with voltage, inductance
and DCR values to meet your specific requirements. For
more information, contact Coilcraft.
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Part
number
T6437-D
Isolated
voltage
5 V to 5V
Inductance
min (µH)
1000 (1-4)
Q4470-C
5 V to 5 V
400 (1-3)
S5394-C 5 V to 10 V 400 (1-3)
U6982-C 3.3 V to 5 V
59 (1-3)
S5499-D 5 V to 24 V 160 (1-4)
T6650-D
5 V to 24 V
176 (2-3)
1. Operating temperature range 40°C to +85°C.
2. Electrical specifications at 25°C.
Volt-time
product typ DCR max
(VµsDeca)taSheet(4OUhm.cso)m
134 (1-4) 1.010 (1-2, 3-4)
1.955 (8-5)
27 (1-3)
0.950 (1-3)
1.25 (6-4)
27 (1-3)
0.950 (1-3)
0.950 (6-4)
22 (1-3)
0.700 (1-3)
1.800 (6-4)
48 (1-4) 0.540 (1-2, 3-4)
4.28 (8-7, 6-5)
48 (2-3)
1.015 (2-3)
8.250 (7-6)
Isolation
Pri-Sec
(Vrms)
1500 (1,3-8)
1500 (1-4)
1500 (1-4)
1500 (1-4)
1500 (1,3-8,6)
1500 (2-7)
Turns
ratio
1 CT:1
1 CT:1.3 CT
1 CT:1
1 CT: 2.1 CT
1 CT:5 CT
1:5
Schematic
18
2
3
45
16
25
34
16
2
34
16
25
34
18
27
36
45
27
36
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Specifications subject to change without notice. Document 193-1 Revised 11/13/02

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Miniature SMT Transformers
Document 193 -2
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Size C: Parts/reel: 131000 Tape width: 16 mm
Size D: Parts/reel: 13750 Tape width: 24 mm
For packaging data see Tape and Reel Specifications section.
Specifications subject to change without notice. Document 193-2 Revised 11/04/02