1 Features
• Ultra-low noise:
– Voltage noise:
• 0.9 nV/√Hz at 1 kHz, IDS = 5 mA
• 1.1 nV/√Hz at 1 kHz, IDS = 2 mA
– Current noise: 1.6 fA/√Hz at 1 kHz
• Low VGS mismatch: 4 mV (max)
• Low gate current: 10 pA (max)
• Low input capacitance: 13 pF at VDS = 5 V
• High gate-to-drain and gate-to-source breakdown
voltage: –40 V
• High transconductance: 30 mS
• Packages: SOIC, 2-mm × 2-mm WSON

2 Applications
• Microphone inputs
• Hydrophones and marine equipment
• DJ controllers, mixers, and other DJ equipment
• Professional audio mixer or control surface
• Guitar amplifier and other music instrument amp
• Condition monitoring sensor

3 Description
The JFE2140 is a Burr-Brown™ Audio, matchedpair
discrete JFET built using Texas Instruments'
modern, high-performance, analog bipolar process.
The JFE2140 features performance not previously
available in older discrete JFET technologies. The
JFE2140 offers excellent noise performance across
all current ranges, where the quiescent current can
be set by the user from 50 μA to 20 mA. When
biased at 5 mA, the device yields 0.9 nV/√Hz of inputreferred
noise, giving ultra-low noise performance with
extremely high input impedance (> 1 TΩ). In addition,
the matching between JFETs is tested to ±4 mV,
providing low offset and high CMRR performance
for differential pair configurations. The JFE2140 also
features integrated diodes connected to separate
clamp nodes to provide protection without the addition
of high leakage, nonlinear external diodes.
The JFE2140 can withstand a high drain-to-source
voltage of 40‑V, as well as gate-to-source and gate-todrain
voltages down to –40 V. The temperature range
is specified from –40°C to +125°C.