ISDN S-INTERFACE
TRANSFORMERS
Transformer Selection and Packaging
IC IC Dual Single Dual Single
Manufacturer Part Number Surface Mount Through Hole, 2 KVrms Through Hole Through Hole, 3 KVrms
NOTES
A. In this catalog, turns ratio is expressed as
“primary:secondary”. The term “CT” designates a center
tapped winding. The term “CS” designates a split center tap
winding. A center tapped winding can be created by connect-
ing 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. The minimum primary inductance and the 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 capaci-
tance 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.
D. National recommends a 1:2 receive transformer, but used as
a 1:1 ratio by connecting only half the secondary winding.
See National’s application note.
E. PE-65950, PE-68613 and PE-65853 are recommended for
use with Siemens PEB 2080/2085 and help in meeting the
required longitudinal balance.
F. Standard packaging for all chokes and transformers listed in
this catalog is anti-static tubes. Optional anti-static tray
packaging can be ordered for the surface mount SC-1 and
LA-1 packages by adding an “R” suffix to the part number,
(ie: PE-65795R). Optional tape and reel packaging can be
ordered for all surface mount packages by adding a “T” suffix
to the part number, (ie: PE-65795T).
G. For PE-65854, OCL at -40°C is 27 µH minimum. For maxi-
mum performance use windings (1-8) and (2-7) as a pair and
windings (3-6) and (4-5) as a pair.
H. For transformers and choke modules, refer to data sheet T632.
Packaging Information
Trans & Rec Transmit Receive Trans & Rec Transmit Receive
AMD
Am 79C30A/79C32A
PE-65799 PE-64999 PE-64999 PE-65499 PE-68999 PE-68999
AT&T/Lucent
T7250/7256/7259
PE-65798 PE-64998 PE-64998 PE-65498 PE-68998 PE-68998
T7903
PE-65795 PE-64995 PE-64995 PE-65495 PE-68995 PE-68995
Mietec
MTC-2072
PE-65795 PE-64995 PE-64995 PE-65495 PE-68995 PE-68995
Mitel
MT8930
PE-65795 PE-64995 PE-64995 PE-65495 PE-68995 PE-68995
Motorola
MC145474/145475
PE-65793 PE-64993 PE-64993 PE-65493 PE-68993 PE-68993
MC145574
PE-65798 PE-64998 PE-64998 PE-65498 PE-68998 PE-68998
National D
TP3420/3421
PE-65795 PE-64995 PE-64995 PE-65495 PE-68995 PE-68992
SGS Thomson
ST5420, ST5421
PE-65795 PE-64995 PE-64995 PE-65495 PE-68995 PE-68995
PEB 2080/2081/2085
Siemens PSB 2186 PE-65795 PE-64995 PE-64995 PE-65495 PE-68995 PE-68995
PEB 2084/2086
Yamaha
7405B
PE-65795 PE-64995 PE-64995 PE-65495 PE-68995 PE-68995
Package FType Part Weight Parts/Tube Parts/Tray Parts/Reel Reel Diameter Tape Width Pitch
LA-1 SMT 2.0 grams 30 60 250 13 inches 24 mm 24 mm
PA-2 SMT 4.0 grams 35 – 150 13 inches 32 mm 24 mm
SC-1 SMT 7.0 grams 20 50 150 13 inches 44 mm 24 mm
SH-4 SMT 0.3 grams 25 – 1500 13 inches 24 mm 12 mm
ID-1 THT 7.0 grams 20 – – – – –
IN-1 THT 2.5 grams 35 – – – – –
IS THT 4.0 grams 35 – – – – –
VC-1 THT 3.5 grams 40 – – – – –
WD-1 THT 9.0 grams 25 – – – – –
(See Pages 4 and 5 for Table Notes)
USA 858 674 8100
••
UK 44 1483 401 700
••
France 33 3 84 35 04 04
••
Singapore 65 6287 8998
••
Shanghai
86 21 32181071
••
China 86 769 5538070
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Taiwan 886 2 26980228
www.pulseeng.com
4 T604.D (1/06)