PN4117A

Series:	--
Packaging:	Bulk
Part Status:	Obsolete
FET Type:	N-Channel
Voltage - Breakdown (V(BR)GSS):	40V
Current - Drain (Idss) @ Vds (Vgs=0):	30µA @ 10V
Voltage - Cutoff (VGS off) @ Id:	600mV @ 1nA
Input Capacitance (Ciss) (Max) @ Vds:	3pF @ 10V
Power - Max:	350mW
Operating Temperature:	-55°C ~ 150°C (TJ)
Mounting Type:	Through Hole
Package / Case:	TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package:	TO-92-3
Base Part Number:	2N4117

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<p>PN4117A is a high-quality field effect transistor (FET) designed specifically for audio applications including amplifiers, mixers, and signal processors. This short-channel depletion-mode FET features high input impedance, low noise, and wide bandwidth. The use of this FET has extended to a wide range of applications including speaker protection circuits, headphone amplifiers, active crossover filters, low noise microphones amplifiers, studio-quality microphone preamps, and so on.</p><p>The PN4117A is a depletion-mode JFET based on the MOSFET design. It is a source terminal grounded n-channel enhancement-mode FET with a stainless steel gate and a source lead connected directly to the gate instead of a gate terminal. The gate must be positively biased to ensure that the FET is in the off mode; otherwise, the JFET will remain in an on state even when the gate signal is zero. A positive voltage applied to the gate results in forward current, while a negative gate voltage means an off-state. Because of its depletion-mode, PN4117A has no active gain and is used primarily to create an enhanced current path.</p><p>The PN4117A is characterized by its high input impedance, low noise, and wide bandwidth. Its input impedance ranges from 5k - 100k ohms which is suitable for a wide range of audio applications, from line level to microphone level input. Moreover, PN4117A has a wide frequency response, up to 100GHz and a low noise floor. Because of its high input impedance, PN4117A has a good rejection ratio for common-mode interference.</p><p>The PN4117A is also highly reliable. It has a high quality Stainless Steel gate and a drain to source leakage of up to 0.01mA max. The device also has a very low thermal resistance at 25 degrees Celsius, and its protection diodes work well at as low as 0.5V typical.</p><p>In conclusion, the PN4117A is a high-quality field effect transistor designed specifically for audio applications. Its features include high input impedance, low noise, wide bandwidth, high reliability, and low thermal resistance. Its high input impedance makes it very effective in rejecting common-mode interference. Highly reliable and widely used, the PN4117A is a popular choice for audio applications.</p>

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