| 摘要 |
A Darlington transistor pair unit comprising a Darlington transistor pair enclosed in a solid resin enclosure (3) and having external connection terminals (11,12,13,14) mounted on a stepped surface (35,36,37,38) of the enclosure (3) said stepped surface (35,36,373,38) being shaped to provide two relatively raised surface portions (35,36) alternating with two relatively lower surface portions (37,38) first and second external connection terminals (11,12) for the collector and emitter of the second-stage transistor being mounted respectively on said relatively raised surface portions (35,36) a third external connection terminal (13) for the emitter of the first-stage transistor being mounted on the relatively lower surface portion (37) between said raised surface portions (35,36) and a fourth external connection terminal (14) for the base of the first-stage being mounted on the other lower surface portion (38) which is at an outer side of said stepped surface. Two such units can be interconnected in a simple manner by means of mutually parallel conductors extending along the aligned surface portions of the two units thereby avoiding any connection cross-over problems and being readily mountable on a printed circuit board while being capable of providing adequate inter-terminal insulation distances with no increase in external size over prior art units. |
