Voice & Data Coupling Transformers
Impedance Matching Transformers for Telecommunications
Frequency 300Hz to 3500Hz
Designed to meet FCC part 68
Custom Designs Available
Insertion
Loss
(1)
(dB)
1.50
1.00
1.30
1.55
1.60
1.20
1.30
1.20
1.25
1.50
1.55
1.20
Return
(2)
Loss
(dB)
11.5
14.5
12.5
11.0
10.5
12.5
11.0
13.0
16.0
9.5
12.0
13.0
DCR
PRI.
(Ω)
55.0
55.0
67.0
76.0
76.0
83.0
83.0
66.2
76.0
82.8
90.0
66.0
DCR
SEC.
(Ω)
65.0
70.0
76.0
92.0
92.0
126
126
82.2
86.0
85.4
110
82.0
Frequency
(4)
Response
Schematic
( + dB )
Style / Pkg
0.5
0.3
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
A
B
B
A
A
B
B
C
D
C
D
D
/
/
/
/
/
/
/
/
/
/
/
/
8-pin
8-pin
8-pin
8-pin
8-pin
8-pin
8-pin
12-pin
12-pin
12-pin
12-pin
12-pin
Low Distortion
May be used in V.32 applications
Isolation is 1500 V
RMS
min.
Impedance
PRI.
SEC.
(Ω)
(Ω)
600
600
600
900
900
900
900
600
600
900
900
600
600
600
600
600
600
600
600
600
600
600
600
600
Turns
Ratio
+ 2%
1:1
1:1.127
1:1.127
1:0.817
1:0.817
1:0.942
1:0.942
1:1
1:1.125
1:.0816
1:0.946
1:1
DCI
max.
(mA)
80
80
80
80
80
80
80
80
80
80
80
80
Secondary load 600
Ω
with DC in Pri.
Part
Number
T-31000
T-31001
T-31002
T-31003
T-31004
T-31005
T-31006
T-31010
T-31011
T-31012
T-31013
T-31014
THD
(dB)
-65
-65
-53
-65
-53
-65
-53
-53
-59
-53
-53
-53
(3)
1. Insertion Loss measured at 1 KHz
2. Return Loss measured at 300 Hz
3. Total Harmonic Distortion measured at 0 dBm & 300 Hz
4. Frequency Response measured from 300 Hz to 3500 Hz
8
8-Pin Package ( T-31000 to T-31006 )
1.00
(25.4)
1
2
Schematic "A"
PRI
2
SEC
7
1
2
3
3
6
4
Schematic "B"
7
.200
(5.08)
.750
(19.05)
TYP.
1.69
(42.93)
MAX.
PRI
SEC
7
Bottom
View
6
3
4
6
5
.250
(6.35)
3 PL.
Dimensions in Inches (mm)
Unused Pins Omitted as per Schematic
1.39
(35.30)
MAX.
.150
(3.81)
TYP.
.680
(17.27)
12-Pin Package ( T-31010 to T-31014 )
1.20
(30.48)
MAX.
.125
(3.18)
TYP.
1
.035
(0.89)
TYP.
Schematic "C"
PRI
1
SEC
7
Schematic "D"
PRI
1
3
4
SEC
7
1.00
(25.4)
3
4
12
7
.200
(5.08)
.950
(24.13)
.400
(10.16)
1.41
(35.81)
MAX.
6
12
6
12
6
.820
(20.83)
Specifications subject to change without notice.
.025
(0.63)
SQ.
.930
(23.62)
MAX.
VDC_A - 10/98
For other values & Custom Designs, contact factory.
Rhombus
Industries Inc.
9
15801 Chemical Lane, Huntington Beach, CA 92649-1595
Tel: (714) 898-0960
•
Fax: (714) 896-0971
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