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Maxim > Design Support > Technical Documents > Application Notes > T/E Carrier and Packetized > APP 351
Keywords: transformers, turns ratio, inductance, primary winding, secondary winding, isolation voltage,
Pulse Engineering, Halo Electronics, Bel Fuse, Coev Magnetics, Tyco
APPLICATION NOTE 351
T1/E1 and T3/E3 Transformer Selection Guide
Sep 17, 2007
Abstract: This application note lists vender transformers that meet the specifications required for use with
Maxim Single-Chip Transceivers (SCTs) and Line Interface Units (LIUs). Recommended transformers are
made based on the following transformer specifications: turns ratio, primary inductance, leakage
inductance, interwinding capacitance, and DC resistance for both 5V and 3.3V operation. Actual results
are dependant on the integrity of the PCB design and other termination circuitry and should be verified
by the customer.
Introduction
This application note applies to the following products:
T1/E1
LIUs
T1 SCTs E1 SCTs
T1/E1
SCTs
T1/E1 Ethernet/Serial
TDM
T3/E3
LIUs
T3/E3
SCTs
DS2148 DS2151 DS2153 DS2156 DS33R11 DS3150 DS3170
DS21348 DS2152 DS2154 DS2155 DS33R41 DS3151 DS3171
DS21Q48 DS21352 DS21354 DS21Q55
DS3152 DS3172
DS21Q348 DS21552 DS21554 DS21455
DS3153 DS3173
DS21448 DS21Q552 DS21Q554 DS21458
DS3154 DS3174
DS2149 DS21Q352 DS21Q354 DS26502
DS3251 DS3181
DS21349 DS2196 DS21Q59 DS26503
DS3252 DS3182
DS26303
DS21Q58 DS26504 DS3253 DS3183
DS26324
DS21Q50 DS26518 DS3254 DS3184
DS26334
DS26519 DS32504
DS26521 DS32506
DS26522 DS32508
DS26524 DS32512
DS26528
Table 1 shows the specifications for our 5V devices and Table 2 shows the specifications for our 3.3V
devices. The specifications for selecting an appropriate transformer are given in the data sheets for each
device and repeated below for simplicity. Table 3 lists the transformer part numbers from multiple
vendors and matches them with the parts listed above.
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