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High-speed op amps (GBW ≥ 50 MHz)

OPA838

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1mA, 300MHz gain bandwidth, voltage-feedback operational amplifier

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Data sheet

OPA838

ACTIVE
Data sheet Order now

Product details

Architecture Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.7 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.4 GBW (typ) (MHz) 300 BW at Acl (MHz) 90 Acl, min spec gain (V/V) 6 Slew rate (typ) (V/µs) 350 Vn at flatband (typ) (nV√Hz) 1.8 Vn at 1 kHz (typ) (nV√Hz) 1.8 Iq per channel (typ) (mA) 0.96 Vos (offset voltage at 25°C) (max) (mV) 0.125 Rail-to-rail In to V-, Out Features Decompensated, Shutdown Rating Catalog Operating temperature range (°C) -40 to 125 CMRR (typ) (dB) 105 Input bias current (max) (pA) 4400000 Offset drift (typ) (µV/°C) 0.4 Iout (typ) (mA) 20 2nd harmonic (dBc) -110 3rd harmonic (dBc) -120 Frequency of harmonic distortion measurement (MHz) 1
Architecture Voltage FB Number of channels 1 Total supply voltage (+5 V = 5, ±5 V = 10) (min) (V) 2.7 Total supply voltage (+5 V = 5, ±5 V = 10) (max) (V) 5.4 GBW (typ) (MHz) 300 BW at Acl (MHz) 90 Acl, min spec gain (V/V) 6 Slew rate (typ) (V/µs) 350 Vn at flatband (typ) (nV√Hz) 1.8 Vn at 1 kHz (typ) (nV√Hz) 1.8 Iq per channel (typ) (mA) 0.96 Vos (offset voltage at 25°C) (max) (mV) 0.125 Rail-to-rail In to V-, Out Features Decompensated, Shutdown Rating Catalog Operating temperature range (°C) -40 to 125 CMRR (typ) (dB) 105 Input bias current (max) (pA) 4400000 Offset drift (typ) (µV/°C) 0.4 Iout (typ) (mA) 20 2nd harmonic (dBc) -110 3rd harmonic (dBc) -120 Frequency of harmonic distortion measurement (MHz) 1
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8 SOT-SC70 (DCK) 5 4.2 mm² 2 x 2.1 SOT-SC70 (DCK) 6 4.2 mm² 2 x 2.1 X2QFN (DXB) 8 1.68 mm² 1.4 x 1.2
  • Gain bandwidth product: 300MHz
  • Very-low (trimmed) supply current: 950µA
  • Bandwidth: 90MHz (AV = 6V/V)
  • High full-power bandwidth: 45MHz, 4VPP
  • Negative rail input, rail-to-rail output
  • Single-supply operating range: 2.7V to 5.4V
  • 25°C input offset: ±125µV (maximum)
  • Input offset voltage drift: < ±1.6µV/°C (maximum)
  • Input voltage noise: 1.8nV/√Hz (> 200Hz)
  • Input current noise: 1pA/√Hz (> 2000Hz)
  • < 1µA shutdown current for power savings
  • Gain bandwidth product: 300MHz
  • Very-low (trimmed) supply current: 950µA
  • Bandwidth: 90MHz (AV = 6V/V)
  • High full-power bandwidth: 45MHz, 4VPP
  • Negative rail input, rail-to-rail output
  • Single-supply operating range: 2.7V to 5.4V
  • 25°C input offset: ±125µV (maximum)
  • Input offset voltage drift: < ±1.6µV/°C (maximum)
  • Input voltage noise: 1.8nV/√Hz (> 200Hz)
  • Input current noise: 1pA/√Hz (> 2000Hz)
  • < 1µA shutdown current for power savings

The OPA838 decompensated voltage-feedback operational amplifier provides a high, 300MHz gain bandwidth product with 1.8nV/√Hz input noise voltage, requiring only a trimmed 0.95mA supply current. These features combine to provide an extremely power-efficient device for photodiode transimpedance designs and high-voltage gain stages, which require the lowest input voltage noise in signal receiver applications.

Operating at the minimum recommended noninverting gain of 6V/V results in a 90MHz, –3dB bandwidth. Extremely low input noise and offset voltage make the OPA838 an excellent choice for high gains. Even at a dc-coupled gain of 1000V/V, a 300kHz signal bandwidth is available with a maximum output offset voltage of ±125mV.

The single-channel OPA838 is available in 6-pin SOT-23, 6-pin SC70, and 8-pin X2QFN packages, all with a power shutdown feature. The OPA838 is also available in a 5-pin SC70 package.

The OPA838 decompensated voltage-feedback operational amplifier provides a high, 300MHz gain bandwidth product with 1.8nV/√Hz input noise voltage, requiring only a trimmed 0.95mA supply current. These features combine to provide an extremely power-efficient device for photodiode transimpedance designs and high-voltage gain stages, which require the lowest input voltage noise in signal receiver applications.

Operating at the minimum recommended noninverting gain of 6V/V results in a 90MHz, –3dB bandwidth. Extremely low input noise and offset voltage make the OPA838 an excellent choice for high gains. Even at a dc-coupled gain of 1000V/V, a 300kHz signal bandwidth is available with a maximum output offset voltage of ±125mV.

The single-channel OPA838 is available in 6-pin SOT-23, 6-pin SC70, and 8-pin X2QFN packages, all with a power shutdown feature. The OPA838 is also available in a 5-pin SC70 package.
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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet OPA838 1mA, 300MHz Gain Bandwidth, Voltage-Feedback Op Amp datasheet (Rev. E) PDF | HTML 06 Aug 2025
Technical article 3 common questions when designing with high-speed amplifiers PDF | HTML 17 Jul 2020
Application brief Higher accuracy using an external amplifier in ultrasonic flow measurement 05 Feb 2019
Application note Noise Analysis for High Speed Op Amps (Rev. A) 17 Jan 2005

Design & development

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

Evaluation board

OPA838DBVEVM — OPA838 evaluation module for DBV package

The OPA838DBVEVM is an evaluation module for the single OPA838 amplifier in the DBV (SOT23-6) package. This evaluation module is designed to quickly and easily demonstrate the functionality and versatility of the amplifier. The EVM is ready to connect to power, signal source, and test instruments (...)
User guide: PDF
Not available on TI.com
Evaluation board

OPA838DCKEVM — OPA838 evaluation module for DCK package

The OPA838DCKEVM is an evaluation module for the single OPA838 amplifier in the DCK (SC70-5) package. This evaluation module is designed to quickly and easily demonstrate the functionality and versatility of the amplifier. The EVM is ready to connect to power, signal source, and test instruments (...)
User guide: PDF
Not available on TI.com
Simulation model

OPA838 PSpice Model

SBOMBQ1.ZIP (185 KB) - PSpice Model
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Simulation model

OPA838 TINA-TI Reference Design (Rev. A)

SBOMAE7A.TSC (51 KB) - TINA-TI Reference Design
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Simulation model

OPA838 TINA-TI Spice Model (Rev. A)

SBOMAE6A.ZIP (14 KB) - TINA-TI Spice Model
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Calculation tool

ANALOG-ENGINEER-CALC — PC software 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 operational-amplifier (...)

Supported products & hardware

Supported products & hardware
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Calculation tool

VOLT-DIVIDER-CALC — Voltage divider calculation tool

The voltage divider calculation tool (VOLT-DIVIDER-CALC) quickly determines a set of resistors for a voltage divider. This KnowledgeBase JavaScript utility can be used to find a set of resistors for a voltage divider to achieve the desired output voltage. VOLT-DIVIDER-CALC can also be used to (...)
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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-02003 — Ultrasonic sensing subsystem reference design for gas flow measurement

This reference design helps designers develop an ultrasonic gas-metering subsystem using an integrated, ultrasonic sensing solution (USS) module, which provides superior metrology performance with low-power consumption and maximum integration. The design is based on the 64KB MSP430FR6043 (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDM-02005 — Optimized ultrasonic sensing metrology reference design for water flow measurement

This reference design helps designers develop a cost optimized ultrasonic water-metering subsystem using an integrated, ultrasonic sensing solution (USS) module, which provides superior metrology performance with low-power consumption and maximum integration. The design is based on the 64KB (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBV) 6 Ultra Librarian
SOT-SC70 (DCK) 5 Ultra Librarian
SOT-SC70 (DCK) 6 Ultra Librarian
X2QFN (DXB) 8 Ultra Librarian
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