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Precision op amps (Vos<1mV)

OPA325

ACTIVE

Low noise (10nV/rtHz), wide bandwidth (10MHz), low power (0.65mA), zero crossover op amp

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Data sheet

OPA325

ACTIVE
Data sheet Order now

Product details

Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.2 Vos (offset voltage at 25°C) (max) (mV) 0.15 Offset drift (typ) (µV/°C) 2 Input bias current (max) (pA) 10 GBW (typ) (MHz) 10 Features Zero Crossover Slew rate (typ) (V/µs) 5 Rail-to-rail In, Out Iq per channel (typ) (mA) 0.65 Vn at 1 kHz (typ) (nV√Hz) 10 CMRR (typ) (dB) 114 Rating Catalog Operating temperature range (°C) -40 to 125 Iout (typ) (A) 0.03 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.1 Input common mode headroom (to positive supply) (typ) (V) 0.1 Output swing headroom (to negative supply) (typ) (V) 0.01 Output swing headroom (to positive supply) (typ) (V) -0.01 THD + N at 1 kHz (typ) (%) 0.0005
Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.5 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.2 Vos (offset voltage at 25°C) (max) (mV) 0.15 Offset drift (typ) (µV/°C) 2 Input bias current (max) (pA) 10 GBW (typ) (MHz) 10 Features Zero Crossover Slew rate (typ) (V/µs) 5 Rail-to-rail In, Out Iq per channel (typ) (mA) 0.65 Vn at 1 kHz (typ) (nV√Hz) 10 CMRR (typ) (dB) 114 Rating Catalog Operating temperature range (°C) -40 to 125 Iout (typ) (A) 0.03 Architecture CMOS Input common mode headroom (to negative supply) (typ) (V) -0.1 Input common mode headroom (to positive supply) (typ) (V) 0.1 Output swing headroom (to negative supply) (typ) (V) 0.01 Output swing headroom (to positive supply) (typ) (V) -0.01 THD + N at 1 kHz (typ) (%) 0.0005
SOT-23 (DBV) 5 8.12 mm² (2.9 mm × 2.8 mm)
  • Precision with zero-crossover distortion:
    • Low offset voltage: 150 µV (maximum)
    • High CMRR: 114 dB
    • Rail-to-rail I/O
  • Wide bandwidth: 10 MHz
  • Quiescent current: 650 µA/ch
  • Single-supply voltage range: 2.2 V to 5.5 V
  • Low input bias current: 0.2 pA
  • Low noise: 9 nV/√Hz at 10 kHz
  • Slew rate: 5 V/µs
  • Unity-gain stable
  • Precision with zero-crossover distortion:
    • Low offset voltage: 150 µV (maximum)
    • High CMRR: 114 dB
    • Rail-to-rail I/O
  • Wide bandwidth: 10 MHz
  • Quiescent current: 650 µA/ch
  • Single-supply voltage range: 2.2 V to 5.5 V
  • Low input bias current: 0.2 pA
  • Low noise: 9 nV/√Hz at 10 kHz
  • Slew rate: 5 V/µs
  • Unity-gain stable

The OPA325, OPA2325, and OPA4325 (OPAx325) are precision, low-voltage complementary metal-oxide semiconductor (CMOS) operational amplifiers optimized for very low noise and wide bandwidth, while operating on a low quiescent current of only 650 µA.

The OPAx325 feature a linear input stage with zero-crossover distortion that delivers excellent common-mode rejection ratio (CMRR) of typically 114 dB over the entire input range. The input common-mode range extends 100 mV beyond the negative and positive supply rails. The output voltage typically swings within 10 mV of the rails.

The zero-crossover distortion, combined with wide bandwidth (10 MHz), high slew rate (5 V/µs), and low noise (9 nV/√Hz), make the OPAx325 a very good successive-approximation register (SAR) analog-to-digital converter (ADC) input driver amplifier. In addition, the OPAx325 have a wide supply-voltage range from 2.2 V to 5.5 V, with excellent power-supply rejection ratio (PSRR) over the entire supply range, making the device an excellent choice for precision, low-power applications that run directly from batteries without regulation.

The OPA325 (single-channel version) is available in the SOT23-5 package. The OPA2325 (dual-channel version) is offered in SO-8 and MSOP-8 packages. The OPA4325 (quad-channel version) is available in TSSOP-14 package.

The OPA325, OPA2325, and OPA4325 (OPAx325) are precision, low-voltage complementary metal-oxide semiconductor (CMOS) operational amplifiers optimized for very low noise and wide bandwidth, while operating on a low quiescent current of only 650 µA.

The OPAx325 feature a linear input stage with zero-crossover distortion that delivers excellent common-mode rejection ratio (CMRR) of typically 114 dB over the entire input range. The input common-mode range extends 100 mV beyond the negative and positive supply rails. The output voltage typically swings within 10 mV of the rails.

The zero-crossover distortion, combined with wide bandwidth (10 MHz), high slew rate (5 V/µs), and low noise (9 nV/√Hz), make the OPAx325 a very good successive-approximation register (SAR) analog-to-digital converter (ADC) input driver amplifier. In addition, the OPAx325 have a wide supply-voltage range from 2.2 V to 5.5 V, with excellent power-supply rejection ratio (PSRR) over the entire supply range, making the device an excellent choice for precision, low-power applications that run directly from batteries without regulation.

The OPA325 (single-channel version) is available in the SOT23-5 package. The OPA2325 (dual-channel version) is offered in SO-8 and MSOP-8 packages. The OPA4325 (quad-channel version) is available in TSSOP-14 package.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet OPAx325 Precision, 10-MHz, Low-Noise, Low-Power, RRIO, CMOS Operational Amplifiers datasheet (Rev. D) PDF | HTML Jun 26, 2019
Analog design Journal Selecting precision op amps as ADC drivers (Rev. A) PDF | HTML May 5, 2026
Circuit design Single-Supply, 2nd-Order, Sallen-Key Band-Pass Filter Circuit (Rev. A) PDF | HTML Jan 27, 2025
Application brief How to Select Amplifiers for Pressure Transmitter Applications (Rev. B) PDF | HTML Feb 14, 2023
Circuit design Single-supply, 2nd-order, multiple feedback high-pass filter circuit PDF | HTML Jun 28, 2021
Circuit design Single-supply, 2nd-order, multiple feedback low-pass filter circuit PDF | HTML Jun 28, 2021
Circuit design Single-supply, 2nd-order, Sallen-Key high-pass filter circuit PDF | HTML Jun 28, 2021
Circuit design Single-supply, 2nd-order, Sallen-Key low-pass filter circuit PDF | HTML Jun 28, 2021
Circuit design Single-supply, 2nd-order, multiple feedback band-pass filter circuit PDF | HTML Jun 28, 2021

Design & development

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Evaluation board

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The ADS7066 evaluation module (EVM) performance demonstration kit (PDK) is a platform for evaluating the performance of the ADS7066 successive approximation register (SAR) analog-to-digital converter (ADC)

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Evaluation board

AMP-PDK-EVM — Amplifier performance development kit evaluation module

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SBOMA82C.ZIP (29 KB) - PSpice model
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SBOMA81B (317 KB) - TINA-TI reference design
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SBOC598.TSC (61 KB) - TINA-TI Spice model
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Simulation for Single-supply, Second-order, Multiple-feedback High-pass Filter

SBOC599.TSC (61 KB) - TINA-TI Spice model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software analog engineer's calculator

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Calculation tool

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This folder contains three tools to help in understandning and managing noise in cicuits. The included tools are:

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Design tool

CIRCUIT060011 — Single-supply, second-order, multiple feedback high-pass filter circuit

The multiple-feedback (MFB) high-pass (HP) filter is a 2nd-order active filter. Vref provides a DC offset to accommodate for single-supply applications. This HP filter inverts the signal (Gain = –1 V/V) for frequencies in the pass band. An MFB filter is preferable when the gain is high or (...)
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Design tool

CIRCUIT060012 — Single-supply, 2nd-order, multiple feedback low-pass filter circuit

The multiple-feedback (MFB) low-pass filter (LP filter) is a second-order active filter. Vref provides a DC offset to accommodate for single-supply applications. This LP filter inverts the signal (Gain = –1 V/V) for frequencies in the pass band. An MFB filter is preferable when the gain is (...)
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Design tool

CIRCUIT060053 — High-pass Sallen-Key filter circuit

The Butterworth Sallen-Key (SK) high-pass (HP) filter is a 2nd-order active filter. Vref provides a DC offset to accommodate for single-supply applications. An SK filter is usually preferred when small Q factor is desired, noise rejection is prioritized and when a non-inverting gain of the filter (...)
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Design tool

CIRCUIT060054 — Low-pass Sallen-Key filter circuit

The Butterworth Sallen-Key low-pass filter is a second-order active filter. Vref provides a DC offset to accommodate for single-supply applications. A Sallen-Key filter is usually preferred when small Q factor is desired, noise rejection is prioritized and when a non-inverting gain of the filter (...)
Supported products & hardware
Design tool

CIRCUIT060055 — Multiple feedback band-pass filter circuit

This circuit is a 2nd-order multiple feedback (MFB) band-pass (BP) filter. This BP filter is created by cascading a low-pass and a high-pass filter. Vref provides a DC offset to accommodate for single-supply applications.
Supported products & hardware
Design tool

CIRCUIT060056 — Band-pass Sallen-Key filter circuit

This circuit is a single-supply, 2nd-order Sallen-Key (SK) band-pass (BP) filter. It is designed by cascading an SK low-pass filter and an SK high-pass filter. Vref provides a DC offset to accommodate for a single supply.
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SOT-23 (DBV) 5 Ultra Librarian
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