1 Features
• Enhanced Plastic
– Single controlled baseline
– One fabrication, assembly and test site
– Gold wire
– NiPdAu lead finish
– Available in military (–55°C to 125°C)
temperature range
– Extended product life cycle
– Extended product-change notification
– Product traceability
– Enhanced mold compound for low outgassing
• Low offset voltage: ±125 μV
• Low noise: 10.8 nV/√Hz at 1 kHz
• High common-mode rejection: 130 dB
• Low bias current: ±10 pA
• Rail-to-rail input and output
• Wide bandwidth: 4.5 MHz GBW
• High slew rate: 21 V/μs
• High capacitive load drive: 1 nF
• MUX-friendly/comparator inputs
• Low quiescent current: 560 μA per amplifier
• Wide supply: ±1.35 V to ±20 V, 2.7 V to 40 V
• Robust EMIRR performance: EMI/RFI filters on
input and supply pins

2 Applications
• Land mobile radio
• Sonar
• Low-power audio preamplifier
• Multiplexed data-acquisition systems
• Test and measurement equipment
• ADC driver amplifiers
• SAR ADC reference buffers
• Programmable logic controllers
• High-side and low-side current sensing

3 Description
The OPA4991-EP is a high voltage (40 V) general
purpose operational amplifiers available in enhanced
plastic packaging. The device offers exceptional DC
precision and AC performance, including rail-to-rail
input/output, low offset (±125 μV, typ), low offset drift
(±0.3 μV/°C, typ), low noise (10.8 nV/√Hz and 1.8
μVPP), and 4.5-MHz bandwidth.
Unique features such as differential and commonmode
input-voltage range to the supply rail, high
output current (±75 mA), high slew rate (21 V/μs), and
high capacitive load drive (1 nF) make the OPA4991-
EP a robust, high-performance operational amplifier
for high-voltage applications.
The OPA4991-EP is available in SOT-23 (DYY)
package and is specified from –55°C to 125°C.