Electrical Specifications @ 25°C — Operating Temperature 0°C to 70°C
RoHS
Compliant
Part Number
T5005NL
T5007NL
T5008NL
T5010NL
Ratio
A
(±2%)
A
1:2.5
1:2
1:1
1:1.8
B
1:2.5
1:2
1:1
1:1.8
OCL Pri
(mH MIN)
A&B
22
22
22
22
L
L
Sec
(µH MAX)
A
40
5
5
15
B
40
5
5
15
CW/W
(pF MAX)
A&B
100
100
100
100
CD Pri
B
(pF MAX)
A
110
80
42
160
B
110
80
42
160
DCR Pri
( ±25%)
A
2.4
2.4
2.4
2.4
B
2.4
2.4
2.4
2.4
DCR Sec
(W ±25%)
A
5.3
4.2
2.4
3.8
B
5.3
4.2
2.4
3.8
D I
DC
C
(mA MAX)
1
1
1
1
U.S. Patent No. 5,015,981Z
A. A center-tapped
winding can be created by connecting two ends of a split center winding together on the printed circuit board. In ISDN-S applications, the primary
winding is the line side transformer winding.
B. Minimum primary
inductance and maximum distributed capacitance satisfy the transmitter output and receiver input impedance requirements of CCITT I.430 for both
the TE and the NT. The maximum distributed capacitance allows sufficient margin for the capacitance of the IC and a protection diode network. It is consistent with
the overall maximum value specified and the permitted length of the basic access TE cord.
C. The maximum
specified unbalanced DC current capability is based on 20 mH minimum primary OCL.
See next
page for detailed packaging information.
Mechanical
TSJ
Schematic
16 15 14 13
12 11 10
9
SEC
PRI
1
2 3 4
COIL A
5
6 7 8
COIL B
Dimensions:
Inches
mm
Unless otherwise specified all tolerances are ±.010
Standard packaging for all transformers on this data sheet is anti-static
tubes. Optional Tape & Reel packaging can be ordered by adding a “T” suffix to
the end of the part number, (i.e: T5005NLT).
*NOTE:
National recommends a 1:2 receive transformer, but used as
a 1:1 ratio by connecting only half the secondary winding.
Application Notes
1. General Information
– The S-interface is the standard-
ized four-wire digital telephone access point defined by
the CCITT I-series recommendations for the Integrated
Services Digital Network. This “basic rate access” accom-
modates two 64 Kbps “B-channels” for information, one
16Kbps “D-channel” intended for signaling and control, and
48Kbps for framing and other purposes, giving a total rate
of 192Kbps. The CCITT physical layer recommends that the
user network interface be transformer coupled.
The transformeAr provides isolation for the line card or the
terminal from the line. It is also a way to provide phantom
power feeding to the terminal over the S-loop. Each end
requires a transmit and a receive transformer. Chokes are
used in some applications to reduce common mode noise.
Transformers described in this data sheet are matched to
the transceivers offered by the IC manufacturers listed.
The use of a transformer-chip pair assures that all require-
ments of CCITT I.430 are met with respect to pulse wave-
form templates, impedance and longitudinal balance. In
addition, the transformers provide the isolation voltages
required by the regulatory agencies and are capable of
passing surge voltage tests.
2. Safety Standards Recognition
– All transformers listed
in this data sheet are recognized to UL 1459 and UL 1950 as
a basic insulation barrier.
3. Flammability
– Materials used in the products are recog-
nized UL94-VO. Products meet the requirements of IEC
695-2-2 (needle flame test).
4. For more
application notes please refer to data sheet T604.
Common Mode Chokes
Refer to data sheet G002 for selection of low and high frequency common mode chokes.
For More Information:
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Pulse: 886 3 4356823
Performance warranty of products offered on this data sheet is limited to the parameters specified. Data is subject to change without notice. Other brand and product
names mentioned herein may be trademarks or registered trademarks of their respective owners.
