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Appendix B – Product Approvals, Design Considerations, Regulatory Information
SocketModem Global MT5634SMI Developer’s Guide 82
EMC
Surface mount ferrites are used on T&R (Tip and Ring) to mitigate emission levels out the RJ-11 cable. 220pF
capacitors are also used on T&R to reduce the common mode emissions that may be present in certain systems.
The ferrite and capacitors also aid in reducing the effects of transients that may be present on the line.
Recommended Sidactor
Manufacturer – Teccor Electronics – Part # - P#3100SA
Manufacturer – ST Microelectronics -- Part 1 – SMP100-270
Recommended Ferrite (SMT)
Manufacturer – Associated Component Technology (ACT) – Part # - YCB-1206
Manufacturer – Murata Erie – Part # - BLM31A601SPT
Recommended Ferrite (Thru-Hole)
Manufacturer – Associated Component Technology (ACT) – Part # - WB2-2.OT
Recommended Capacitor
Manufacturer – Murata Erie – Part # - GHM3045X7R221K-GC (Surface mount device) and
Part # - DE0807B221K-KH (Thru-hole device)
Manufacturer – Ever Grace Electronic Industrials -- Part # - YP221K2EA7PS
Note: The capacitors used on T&R must have a Y2 safety rating.
Telecom
The RJ-11 connector must meet FCC Part 68 requirements. Refer to FCC Part 68 section 68.500 subpart F for
connector specifications. A self-healing fuse is used in series with line to help prevent damage to the DAA circuit.
This fuse is needed for FCC Part 68 compliance.
Recommended Connector
Manufacturer – Stewart – Part # - SS-6446-NF-A431
Recommended Fuse
Manufacturer – RayChem –Part # - TR600-150, TS600-170, or TS600-200
Note: The fuse is also needed to meet UL1950 3
rd
edition protection against over-voltage from power line
crosses.
Common Mode Choke
Manufacturer – TDK – Part # - ZJYS51R5 – 2PT
Safety
All creepages and clearances for the MT5634SMI have been designed to meet requirements of safety standards
EN60950 and IEC950. The requirements are based on a working voltage of 250V. When the recommended
DAA circuit interface is implemented in a third party design all creepage and clearance requirements must be
strictly adhered to. The third party safety design must be evaluated by the appropriate national agency per the
required specification.
User accessible areas: Based on where the third party design is to be marketed/sold or used, it may be
necessary to provide an insulating cover over all TNV exposed areas. Consult with the recognized safety agency
to determine the requirements.
Notice: Even if the recommended design considerations are followed, there are no guarantees that a particular
system will comply with all the necessary regulatory requirements. It is imperative that specific designs be
completely evaluated by a qualified/recognized agency.
Note: All safety notices must be added to any User Guide that you produce.