AO3400 Symbol Min Typ Max Units BV DSS 30 V VDS =30V, V GS =0V 1 TJ=55°C 5 IGSS 100 nA VGS(th) Gate Threshold Voltage 0.65 1.05 1.45 V ID(ON) 30 A 18 28 TJ=125°C 28 39 19 33 mΩ 24 52 mΩThe JFET is currently no longer in production but till the demand for it has created many clones in the market. The closest equivalent for 2N547 is the MMBFJ201 JFET but it is available only on SMD package. The clone FETs available in the market does not seem to follow the datasheet strictly. Hence be careful which employing one in your designs.

The TL08xx JFET-input operational amplifier family is ... An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety ...