The first stage based on CLP200M manages the high power issued from the external surges. When used in ringing mode, the CLP200M operates in voltage mode and pro- vides a symmetrical and bidirectional overvoltage protection at +/-215 V on both TIP and RING lines. When used in speech mode, the CLP200M operates in current mode and the activation current of the CLP200M is ad- justed by RSENSE
| Part No. | Package | Temp. Range |
| TC1426COA | 8-Pin SOIC | OIC to +70IC |
| TC1426CPA | 8-Pin Plastic DIP | OIC to +70IC |
| TC1427COA | 8-Pin SOIC | OIC to +70IC |
| TC1427CPA | 8-Pin Plastic DIP | OIC to +70IC |
| TC1428COA | 8-Pin SOIC | OIC to +70IC |
| TC1428CPA | 8-Pin Plastic DIP | OIC to +70IC |
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