T608.V (1/16)

8

pulseelectronics.com

T1/Cept/ISDN-PRI Transformers

Notes From Tables (pages 1-6):

A. Tolerance leakage inductance:

.30

μH min to .55 μH MAX.

B. OCL (primary inductance) and L

(leakage inductance) are

measured at the primary winding.

Turns ratio is specified primary:

secondary. (CT = Center Tap; CS =

Split Center Tap).

C. To make a 1CT:1 ratio from a 1CT:

2CT ratio, use only one half of

the secondary (2CT) winding.

D. For Reinforced 3 kVrms Dual SMT

Transformers, refer to data sheet

T617. For Octal SMT Transformers,

refer to data sheet T622.

E. Dual Ratio Transformers: These

transformers have tapped

secondary windings to provide

two turns ratios (T/R). Use the

entire primary winding and

connect

F. Standard packaging for surface

mount “AN” and “LA” packages

is ant-static tubes. Optional Tape

& Reel packaging can be ordered

by adding “T” suffix to the part

number (i.e. PE-68864NLT).

G. Safety Agency approvals

pending.

H. The turns ratio of these

devices have been designed, in

conjunction with semiconductor

vendor recommendations, to allow

connections to various terminations

(e.g 75

Ω or 120 Ω with the same

transformer). For 75

Ω termination,

the PEB 2235 requires the following

turns ratio: 1:1.57 (TX) and 1:1.26

(RX) which can be achieved using

pins (1-2):(15-16) for TX and (10-

11):(5-8) for RX. For 120

Ω, the

following turns ratio are required:

1:2 (TX) and 1:1 (RX), which are pins

(1-2):(16-14) for TX and (9-11):(5-8)

for RX.

Part

Number

Turns

Ratio 1

Secondary

Pins

Turns

Ratio 2

Secondary

Pins

PE-65839NL

1:1

3-5

1:1.26

1 - 5

PE-68646NL

1:1.58

3-5

1:2

1 - 5

PE-65389NL

1:1

3-5

1:1.26

1 - 5

PE-68826NL

1:1

2-3

1:1.26

1 - 3

PE-68836NL

1:1

2-3/5-6

1:1.26

1 - 6

3/4

Electrical Specifications @ 25°C - Operating Temperature 0°C to 70°C

Pulse Part Number

Turns Ratio (

±5%)

OCL (

μH MIN)

Package/Schematic

PE-65554NL

1:1:1:1

24.0

IN/1 (ThroughHole)

PE-65555NL

1:1:1:1

8.0

IN/1 (ThroughHole)

PE-65854NL

1:1:1:1

47.0

SH/1 (Surface Mount)

PE-65857NL

1:1:1:1

24.0

LA/2 (Surface Mount)

Notes: For additional Common Mode Chokes, refer to data sheet G002

HIGH FREQUENCY COMMON MODE CHOKES, 4-LINES

0

-5

-10

-15

-20

-25

-30

1 MHz

10 MHz

100 MHz

Frequency

PE-65555NL

PE-65854NL

PE-65554NL

PE-65857NL

18

2

7

3

6

4

5

1

3

6

4

5

1

8

2

7

2

Schematics

Typical common mode attenuation

for high-frequency common mode

chokes based on a 100

Ω system.

L