This Diodes Inc. document provides a good overview of some of the smaller BJT packages The smallest available transistors are available in 0.8x0.6mm DFN packages.
Different manufactures have different names for this package:
- Rohm VML0806 (but I couldn’t find BJTs with this package, only MOSFETs)
- Diodes Inc: DFN0806-3 or X2-DFN0806-3
These are some of the transistors available in this package:
BJTs
NPN parts:
- Diodes Inc MMBT3904FA, 40V, 200mA, 435mW: LCSC
PNP parts:
- Diodes Inc MMBT3906FA, -40V, 200mA, 435mW: Not available on LCSC, Mouser
MOSFETs
Although this post is specifically about BJTs, if you want to use a MOSFET instead, these are small 0.8x0.6mm MOSFETs which turned up while researching the BJTs
N-Channel MOSFETs
- Rohm RV1C002UNT2CL,20V, 150mA, 100mW: LCSC, Mouser
P-Channel MOSFETs
- Rohm RV1C001ZPT2L, -20V, 100mA, 100mW: LCSC, Mouser
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