Datasheet

KSZ8041NL/RNL
DS00002245B-page 50  2017 Microchip Technology Inc.
8.0 SELECTION OF ISOLATION TRANSFORMER
A 1:1 isolation transformer is required at the line interface. An isolation transformer with integrated common-mode
chokes is recommended for exceeding FCC requirements.
Table 8-1 gives the recommended transformer characteristics.
TABLE 8-1: TRANSFORMER SELECTION CRITERIA
Parameter Value Test Condition
Turns Ratio 1 CT : 1 CT —
Open-Circuit Inductance (minimum) 350 H 100 mV, 100 kHz, 8 mA
Leakage Inductance (maximum) 0.4 H 1 MHz (minimum)
Inter-Winding Capacitance (typical) 12 pF —
DC Resistance (typical) 0.9 —
Insertion Loss (maximum) 1.0 dB 0 MHz – 65 MHz
HIPOT (minimum) 1500 V
RMS
—
TABLE 8-2: QUALIFIED SINGLE PORT MAGNETICS
Magnetic Manufacturer Part Number Auto MDI-X Number of Ports
Bel Fuse S558-5999-U7 Yes 1
Bel Fuse (Mag Jack) SI-46001 Yes 1
Bel Fuse (Mag Jack) SI-50170 Yes 1
Delta LF8505 Yes 1
LanKom LF-H41S Yes 1
Pulse H1102 Yes 1
Pulse (low cost) H1260 Yes 1
Transpower HB726 Yes 1
TDK (Mag Jack) TLA-6T718 Yes 1