2 Line Ferrite Common Mode Power Chokes COMMON MODE Steward’s common mode power/data filter products provide the most economi cal EMI filtering available for common mode noise. They provide EMI suppres sion for conductors such as power traces (tracks), and for high speed input/ output circuitry (including network and storage subsystems). They exhibit high frequency impedance essentially independent of DC bias current. Protected by one or more of the following US Patents: 5,455,552 and 5,568,111 Features: ·High current capability (10 amps continuous operation) ·Up to 170 ohms impedance @100MHz or 300 ohms @1GHz ·Parts available in both thru-hole (B) and surface mount (R) versions ·Parts available in broad band and high frequency materials ·Economical common mode EMI filtering ·Compact size Applications: ·Filtering DC power on PC boards, especially in applications of greater than 3.0 amperes ·Filtering common mode EMI on high speed differential lines such as network and SCSI subsystems ·Cost sensitive designs ·Applications where low DCR is needed Part & Test Specifications: ·Maximum current ratings (I MAX) are determined by testing to a maximum temperature rise of 40oC with continuous operating current ·Board level components are rated up to a maximum of 75 volts ·Part performance is shown with curves for Common, Open and Normal Mode Impedances measured along two conductors. Common Mode Impedance is the impedance of EMI noise conducted in the same direction along two conductors. Open Circuit Impedance is the impedance measured across a single leg of the common mode choke. Normal Mode Impedance is the total impedance to the differential circuit (both out and back). Tested with: ·HP4396A (100KHz - 1.8 GHz) or HP8753 (to 6 GHz) Network/Spectrum Analyzer ·HP43961A Impedance Test Kit ·HP16192A Test Fixture or Inter-Continental Microwave custom fixtures ·HP16200A DC Bias Adapter ·Philips PM2811 DC Power Supply ·Ambient Temperature 23.5oC + 2o ·Bandwidth 3 kHz ·Sweep Time 423 ms ·Impedance is rated at + 25% @100MHz PART NUMBERING SYSTEM CM 2545 PRODUCT SERIES CODE PART SIZE CODE X 111 RATED CURRENT CODE B IMPEDANCE VALUE CODE - PACKAGING CODE 00 ADDITIONAL DESCRIPTION Ambient Operating Temperature Range: -55° C to +125° C PART NUMBER Fig # A mm (inches) B mm (inches) C mm (inches) D mm (inches) E mm (inches) IMPEDANCE (Z) TYPICAL OHMS @ 100MHz 500MHz 1GHz DCR MAX OHMS RATED I MAX (continuous) mA * CM2545X111B-00 1 6.30 + 0.25 (0.248 + 0.010) 11.38 + 0.25 (0.448 + 0.010) 9.32 + 0.25 (0.367 + 0.010) 7.62 + 0.10 (0.300 + 0.004) 2.54 + 0.10 (0.100 + 0.004) 110 260 175 0.003 10,000 * CM2545X111R-00 2 6.30 + 0.25 (0.248 + 0.010) 11.38 + 0.25 (0.448 + 0.010) 9.32 + 0.25 (0.367 + 0.010) 7.62 + 0.10 (0.300 + 0.004) 2.54 + 0.10 (0.100 + 0.004) 110 260 175 0.003 10,000 CM2545X171B-00 1 6.30 + 0.25 (0.248 + 0.010) 11.38 + 0.25 (0.448 + 0.010) 9.32 + 0.25 (0.367 + 0.010) 7.62 + 0.10 (0.300 + 0.004) 2.54 + 0.10 (0.100 + 0.004) 170 235 320 0.003 10,000 CM2545X171R-00 2 6.30 + 0.25 (0.248 + 0.010) 11.38 + 0.25 (0.448 + 0.010) 9.32 + 0.25 (0.367 + 0.010) 7.62 + 0.10 (0.300 + 0.004) 2.54 + 0.10 (0.100 + 0.004) 170 235 320 0.003 10,000 * High Frequency Material Figure 1 18 Figure 2 STEWARD - U.S.A. • Telephone: 423/867-4100 • Fax 423/867-4102 • Internet: http://www.steward.com SCOTLAND • Telephone: 44-(0)1-506-414200 • Fax 44-(0)1-506-410694 SINGAPORE • Telephone: (65)337-9667 • Fax (65)337-9686 CM2545X171B&R-00 Z, R, XL vs. Frequency Impedance, Resistance, Inductive Reactance 400 400 Impedance (W) Z 200 R 100 COMMON MODE 300 300 Impedance (W) CM2545X171B&R-00 Z vs. Frequency Open, Common and Normal Mode Common 200 Open 100 Normal XL 0 0 1 10 1000 100 1 10000 10 CM2545X111B&R-00 Z, R, XL vs. Frequency Impedance, Resistance, Inductive 500 10000 1000 CM2545X111B&R-00 Z vs. Frequency Open, Common and Normal Mode 500 400 400 Impedance (W) Impedance (W) 100 Frequency (MHz) Frequency (MHz) 300 Z 200 R 100 300 200 Normal Open Common 100 XL 0 0 1 10 100 1000 10000 Frequency (MHz) 1 10 100 1000 10000 Frequency (MHz) Equivalent Circuts Recommended Soldering Conditions Land Patterns for Reflow Soldering STEWARD - U.S.A. • Telephone: 423/867-4100 • Fax 423/867-4102 • Internet: http://www.steward.com SCOTLAND • Telephone: 44-(0)1-506-414200 • Fax 44-(0)1-506-410694 SINGAPORE • Telephone: (65)337-9667 • Fax (65)337-9686 19