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General-purpose op amps

OPA345

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Single, 5.5-V, 3-MHz, RRIO operational amplifier

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Data sheet
Errata

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NEW OPA310 ACTIVE Single, 5.5-V, 3-MHz high-output-current (150 mA) fast-shutdown (1 μs) operational amplifier Higher slew rate (3V/µs), wider temperature range (-40 to 125C)

OPA345

ACTIVE
Data sheet Order now

Product details

Number of channels (#) 1 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.5 Total supply voltage (Min) (+5V=5, +/-5V=10) 2.5 Rail-to-rail In, Out GBW (Typ) (MHz) 3 Slew rate (Typ) (V/us) 2 Vos (offset voltage @ 25 C) (Max) (mV) 1 Iq per channel (Typ) (mA) 0.15 Vn at 1 kHz (Typ) (nV/rtHz) 30 Rating Catalog Operating temperature range (C) -40 to 85 Offset drift (Typ) (uV/C) 3 Features Decompensated Input bias current (Max) (pA) 1 CMRR (Typ) (dB) 92 Output current (Typ) (mA) 15 Architecture CMOS
Number of channels (#) 1 Total supply voltage (Max) (+5V=5, +/-5V=10) 5.5 Total supply voltage (Min) (+5V=5, +/-5V=10) 2.5 Rail-to-rail In, Out GBW (Typ) (MHz) 3 Slew rate (Typ) (V/us) 2 Vos (offset voltage @ 25 C) (Max) (mV) 1 Iq per channel (Typ) (mA) 0.15 Vn at 1 kHz (Typ) (nV/rtHz) 30 Rating Catalog Operating temperature range (C) -40 to 85 Offset drift (Typ) (uV/C) 3 Features Decompensated Input bias current (Max) (pA) 1 CMRR (Typ) (dB) 92 Output current (Typ) (mA) 15 Architecture CMOS
SOIC (D) 8 19 mm² 3.91 x 4.9 SOT-23 (DBV) 5 5 mm² 2.9 x 1.6
  • RAIL-TO-RAIL INPUT
  • RAIL-TO-RAIL OUTPUT (within 1mV)
  • LOW QUIESCENT CURRENT: 150µA typ
  • MicroSIZE PACKAGES
    • SOT23-5
    • MSOP-8
    • TSSOP-14
  • GAIN-BANDWIDTH
    • OPA344: 1MHz, G ≥ 1
    • OPA345: 3MHz, G ≥ 5
  • SLEW RATE
    • OPA344: 0.8V/µs
    • OPA345: 2V/µs
  • THD + NOISE: 0.006%
  • APPLICATIONS
    • PCMCIA CARDS
    • DATA ACQUISITION
    • PROCESS CONTROL
    • AUDIO PROCESSING
    • COMMUNICATIONS
    • ACTIVE FILTERS
    • TEST EQUIPMENT

All trademarks are the property of their respective owners.
  • RAIL-TO-RAIL INPUT
  • RAIL-TO-RAIL OUTPUT (within 1mV)
  • LOW QUIESCENT CURRENT: 150µA typ
  • MicroSIZE PACKAGES
    • SOT23-5
    • MSOP-8
    • TSSOP-14
  • GAIN-BANDWIDTH
    • OPA344: 1MHz, G ≥ 1
    • OPA345: 3MHz, G ≥ 5
  • SLEW RATE
    • OPA344: 0.8V/µs
    • OPA345: 2V/µs
  • THD + NOISE: 0.006%
  • APPLICATIONS
    • PCMCIA CARDS
    • DATA ACQUISITION
    • PROCESS CONTROL
    • AUDIO PROCESSING
    • COMMUNICATIONS
    • ACTIVE FILTERS
    • TEST EQUIPMENT

All trademarks are the property of their respective owners.

The OPA344 and OPA345 series rail-to-rail CMOS operational amplifiers are designed for precision, low-power, miniature applications. The OPA344 is unity gain stable, while the OPA345 is optimized for gains greater than or equal to five, and has a gain-bandwidth product of 3MHz.

The OPA344 and OPA345 are optimized to operate on a single supply from 2.5V and up to 5.5V with an input common-mode voltage range that extends 300mV beyond the supplies. Quiescent current is only 250µA (max).

Rail-to-rail input and output make them ideal for driving sampling analog-to-digital converters. They are also well suited for general purpose and audio applications and providing I/V conversion at the output of D/A converters. Single, dual and quad versions have identical specs for design flexibility.

A variety of packages are available. All are specified for operation from –40°C to 85°C. A SPICE macromodel for design analysis is available for download from www.ti.com.

The OPA344 and OPA345 series rail-to-rail CMOS operational amplifiers are designed for precision, low-power, miniature applications. The OPA344 is unity gain stable, while the OPA345 is optimized for gains greater than or equal to five, and has a gain-bandwidth product of 3MHz.

The OPA344 and OPA345 are optimized to operate on a single supply from 2.5V and up to 5.5V with an input common-mode voltage range that extends 300mV beyond the supplies. Quiescent current is only 250µA (max).

Rail-to-rail input and output make them ideal for driving sampling analog-to-digital converters. They are also well suited for general purpose and audio applications and providing I/V conversion at the output of D/A converters. Single, dual and quad versions have identical specs for design flexibility.

A variety of packages are available. All are specified for operation from –40°C to 85°C. A SPICE macromodel for design analysis is available for download from www.ti.com.
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Technical documentation

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Type Title Date
* Data sheet Low Power, Single-Supply, Rail-To-Rail Operational MicroAmplifier™ Series datasheet (Rev. A) 27 Aug 2008
* Errata Errata for OPAx344, OPAx345 Data Sheet Literature Number SBOS107 (Revision A) 09 Apr 2013
Technical article What is an op amp? 21 Jan 2020
Technical article How to lay out a PCB for high-performance, low-side current-sensing designs 06 Feb 2018
Technical article Low-side current sensing for high-performance cost-sensitive applications 22 Jan 2018
Technical article Voltage and current sensing in HEV/EV applications 22 Nov 2017
E-book The Signal e-book: A compendium of blog posts on op amp design topics 28 Mar 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

DIP-ADAPTER-EVM — DIP adapter evaluation module

Speed up your op amp prototyping and testing with the DIP-Adapter-EVM, which provides a fast, easy and inexpensive way to interface with small, surface-mount ICs. You can connect any supported op amp using the included Samtec terminal strips or wire them directly to existing circuits.

The (...)

User guide: PDF
Not available on TI.com
Evaluation board

DIYAMP-EVM — Universal Do-It-Yourself (DIY) Amplifier Circuit Evaluation Module

The DIYAMP-EVM is a unique evaluation module (EVM) family that provides engineers and do it yourselfers (DIYers) with real-world amplifier circuits, enabling you to quickly evaluate design concepts and verify simulations. It is available in three industry-standard packages (SC70, SOT23, SOIC) and (...)
User guide: PDF | HTML
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Simulation model

OPA345 PSpice Model (Rev. C)

SBOC012C.ZIP (55 KB) - PSpice Model
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Simulation model

OPA345 TINA-TI Reference Design (Rev. D)

SBOC199D.TSC (93 KB) - TINA-TI Reference Design
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Simulation model

OPA345 TINA-TI Spice Model (Rev. C)

SBOM277C.ZIP (5 KB) - TINA-TI Spice Model
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Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
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Design tool

CIRCUIT060013 — Inverting amplifier with T-network feedback circuit

This design inverts the input signal, VIN, and applies a signal gain of 1000 V/V or 60 dB. The inverting amplifier with T-feedback network can be used to obtain a high gain without a small value for R4 or very large values for the feedback resistors.
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Design tool

CIRCUIT060015 — Adjustable reference voltage circuit

This circuit combines an inverting and non-inverting amplifier to make a reference voltage adjustable from the negative of the input voltage up to the input voltage. Gain can be added to increase the maximum negative reference level.
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Design tool

CIRCUIT060074 — High-side current sensing with comparator circuit

This high-side, current sensing solution uses one comparator with a rail-to-rail input common mode range to create an over-current alert (OC-Alert) signal at the comparator output (COMP OUT) if the load current rises above 1 A. The OC-Alert signal in this implementation is active low. So when the (...)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
User guide: PDF
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Reference designs

TIDM-02000 — Peak current-mode controlled phase-shifted full-bridge reference design using C2000™ real-time MCU

This design implements a digitally peak current mode controlled (PCMC) phase shifted full bridge (PSFB) DC-DC converter which converts a 400-V DC input to a regulated 12-V DC output. Novel PCMC waveform generation based on type-4 PWM and internal slope compensation, and simple PCMC implementation (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDM-BIDIR-400-12 — Bidirectional 400-V/12-V DC/DC Converter Reference Design

The Bidirectional 400V-12V DC/DC Converter Reference Design is a microcontroller-based implementation of an isolated bi-directional DC-DC converter.  A phase shifted full-bridge (PSFB) with synchronous rectification controls power flow from a 400V bus/battery to the 12V battery in step-down (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00412 — 360W Digital Controlled Phase Shift Full Bridge Converter Reference Design

DC-DC power converter with digital control using UCD3138CC64EVM-030 daughter-card. The daughter-card  with preloaded firmware providing the required control functions for a Phase Shift Full Bridge converter.  The TIDA-00412 (UCD3138PSFBEVM-027) accepts a DC input from 370 to 400 VDC, and (...)
Schematic: PDF
Package Pins Download
SOIC (D) 8 View options
SOT-23 (DBV) 5 View options

Ordering & quality

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  • Ongoing reliability monitoring

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