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PMBF4391

PMBF4391 Description

The PMBF4391 from NXP Semiconductors is an N-channel junction field-effect transistor (JFET) housed in a TO-236AB (SC-59, SOT-23-3) surface-mount package. Designed for high-performance applications, it offers a 40V drain-to-source voltage (Vdss) and a 4V gate-source cutoff voltage (VGS off), ensuring reliable operation in low-power circuits. With an ultra-low input capacitance of 14pF @ 20V and a drain current (Idss) of 50mA @ 20V, this JFET excels in high-frequency and low-noise environments. Its 30Ω on-resistance (RDS(on)) and 250mW maximum power dissipation make it suitable for precision analog and switching applications.

PMBF4391 Features

• High Voltage Tolerance: 40V breakdown voltage (V(BR)GSS) and 40V drain-to-source rating for robust performance.
• Low Leakage: 1nA cutoff current (Id) at 4V ensures minimal power loss in standby modes.
• Compact & Reliable: Surface-mount (SMT) TO-236AB package with MSL 1 (unlimited) moisture sensitivity, ideal for automated assembly.
• Low Noise & High Speed: 14pF input capacitance minimizes signal distortion in RF and audio circuits.
• Compliance: ROHS3 compliant and EAR99 classified, with REACH data available.

PMBF4391 Applications

• RF Amplifiers: Low-noise characteristics suit it for VHF/UHF front-end designs.
• Analog Switches: Low RDS(on) and fast switching enable precise signal routing.
• Sensor Interfaces: High input impedance ideal for piezoelectric or capacitive sensors.
• Battery-Powered Systems: Minimal leakage current extends battery life in portable devices.
• Obsolete but Relevant: While marked obsolete, it remains a cost-effective choice for legacy or low-volume designs.

Conclusion of PMBF4391

The PMBF4391 stands out for its low-noise, high-voltage tolerance, and compact form factor, making it a versatile choice for RF, analog, and low-power applications. Though obsolete, its balance of performance and reliability ensures continued utility in niche designs. Engineers seeking a cost-effective JFET with proven specs should consider this NXP offering for precision circuits where minimal signal degradation is critical.