I have only tested the NPN. In Art Of Electronics III is a large table.
At least I have bought:
mouser fzt951 sot-223
digikey fzt851ta npn sot-223
npn zxtn25020BFHTA
pnp zxtp25020bfhcT-ND digikey
pnp zxtp2027fta digikey with note 220pV
pnp zxtp25012 sot-89 DK
zxt690bkct npn d-pack
zxtn07012effta DK marked BF=1100
zxtp07012effta sot23 marked high beta
(inspecting my Zetex drawer)
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You mean table 8.1a (low noise BJTs). Most of them are non SMD but I ll do an exhaustive search. I would prefer LCSC to have them but mouser is fine too
Its not really new...1051/1055 are complementary.I have some of them all, never used in audio, better suited for resonant converters.
The spice model on Diodes Inc's website is 27 years old:
*ZETEX ZTX1049A Spice Model v1.0 Last Revised 15/6/95
*
.MODEL ZTX1049A NPN IS=1.5E-12 NF=1.0 BF=600 IKF=7.5 VAF=100
+ ISE=0.9E-13 NE=1.25 NR=1.0 BR=150 IKR=3 VAR=15
+ ISC=5.0E-13 NC=1.76 RB=0.1 RE=0.018 RC=0.007
+ CJC=136E-12 CJE=550E-12 MJC=0.352 MJE=0.36
+ VJC=0.554 VJE=0.726 TF=400E-12 TR=6.9E-9
*
*$
*
Haha...only to me then...
They just seemed attractive, quite low saturation voltage, low voltage (so I assume lower noise), and good current capability (relatively)