The SKY130 process offer a “free” PNP device, which utilizes the substrate as the collector. This device is not independently optimized, and can be used in forward-active mode. The following sizes of PNP are available:
- ungated device with emitter 0.68 x 0.68 (A=0.4624 µm\ :sup:`2`)
- ungated device with emitter 3.4 x 3.4 (A=11.56 µm\ :sup:`2`)
Using this device must be done in conjunction with the correct guard rings, to avoid potential latchup issues with nearby circuitry. Reverse-active mode operation of the BJT’s are neither modeled nor permitted.
E-test specs for these devices are shown in the table below: