H03K 17/72 having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
Introduced: September 1968
Title
Titles differ between systems:
IPC: Bipolar semiconductor devices with more than two PN junctions, e.g. thyristors, programmable unijunction transistors, or with more than three electrodes, e.g. silicon controlled switches, or with more than one electrode connected to the same conductivity region, e.g. unijunction transistors
CPC: having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
Full Title
Full titles differ between systems:
Electronic switching or gating, i.e. not by contact-making and -breaking > characterised by the use of specified components > by the use, as active elements, of semiconductor devices > Bipolar semiconductor devices with more than two PN junctions, e.g. thyristors, programmable unijunction transistors, or with more than three electrodes, e.g. silicon controlled switches, or with more than one electrode connected to the same conductivity region, e.g. unijunction transistors
Electronic switching or gating, i.e. not by contact-making and –breaking (gated amplifiers H03F3/72; switching arrangements for exchange systems using static devices H04Q3/52) > characterised by the components used (H03K17/04 - H03K17/30, H03K17/94 take precedence) > by the use, as active elements, of semiconductor devices (using diodes H03K17/74) > having more than two PN junctions; having more than three electrodes; having more than one electrode connected to the same conductivity region
IPC and CPC are identically structured here. All 4 subcodes exist in both systems.
4 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1980.
Child Classifications
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- H03K 17/722 with galvanic isolation between the control circuit and the output circuit (H03K17/78 takes precedence) since 1990 +1 CPC IPC+CPC Available in IPC and CPC
- H03K 17/725 for AC voltages or currents (H03K17/722, H03K17/735 take precedence) since 1980 IPC+CPC Available in IPC and CPC
- H03K 17/73 for DC voltages or currents (H03K17/722, H03K17/735 take precedence) since 1980 +1 CPC IPC+CPC Available in IPC and CPC
- H03K 17/735 Switching arrangements with several input- or output-terminals, e.g. multiplexers, distributors (H03K17/722 takes precedence; logic circuits H03K19/00; code converters H03M5/00, H03M7/00) since 1980 IPC+CPC Available in IPC and CPC