Overview
The OPA391DCKR is a micropower, single, high-precision operational amplifier produced by Texas Instruments. It is part of the OPAx391 family, which includes the OPA391, OPA2391, and OPA4391. This device is notable for its unique combination of high bandwidth (1 MHz) and very-low quiescent current (24 µA), making it an exceptional choice for high-gain, low-power applications. The OPA391DCKR features rail-to-rail input and output, ultra-low input bias current, and low offset voltage, making it ideal for ratiometric and amperometric sensor front ends with demanding low-power requirements.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Quiescent Current (IQ) | 24 µA | - |
| Gain Bandwidth Product | 1 MHz | - |
| Input Bias Current | 10 fA | - |
| Offset Voltage (VOS) | ±45 µV (maximum) | - |
| Offset Voltage Drift (dVOS/dT) | ±1.2 µV/°C | - |
| Supply Voltage Range | 1.7 V to 5.5 V | - |
| Input Common Mode Range | ±100 mV beyond rail | - |
| Slew Rate | 1 V/µs | - |
| Output Current Drive | 60 mA | - |
| Package Type | SOT-SC70 (DCK) with 5 pins | - |
| Operating Temperature Range | -40°C to 125°C | - |
Key Features
- Low quiescent current: 24 µA
- High gain bandwidth product: 1 MHz
- Ultra-low input bias current: 10 fA
- Low offset voltage: ±45 µV (maximum)
- Low drift: ±1.2 µV/°C
- Low supply voltage operation: 1.7 V to 5.5 V
- Input common mode range ±100 mV beyond rail
- Fast slew rate: 1 V/µs
- High load capacitance drive
- High output current drive: 60 mA
- Rail-to-rail output
- EMI and RFI filtered inputs
- Small package options: SC-70, DSBGA
Applications
- Portable electronics
- Flow transmitter
- Blood glucose monitor
- Process analytics (pH, gas, force, humidity)
- Temperature transmitter
- Pressure transmitter
- Medical sensor patches
- Building automation
- Wearable fitness and activity monitor
- Gas detector
- Analog security camera
Q & A
- What is the quiescent current of the OPA391DCKR?
The quiescent current of the OPA391DCKR is 24 µA.
- What is the gain bandwidth product of the OPA391DCKR?
The gain bandwidth product of the OPA391DCKR is 1 MHz.
- What is the input bias current of the OPA391DCKR?
The input bias current of the OPA391DCKR is 10 fA.
- What is the maximum offset voltage of the OPA391DCKR?
The maximum offset voltage of the OPA391DCKR is ±45 µV.
- What is the operating temperature range of the OPA391DCKR?
The operating temperature range of the OPA391DCKR is -40°C to 125°C.
- What is the supply voltage range for the OPA391DCKR?
The supply voltage range for the OPA391DCKR is 1.7 V to 5.5 V.
- What is the output current drive capability of the OPA391DCKR?
The output current drive capability of the OPA391DCKR is 60 mA.
- Does the OPA391DCKR have EMI and RFI filtered inputs?
Yes, the OPA391DCKR has EMI and RFI filtered inputs.
- What are some common applications of the OPA391DCKR?
The OPA391DCKR is commonly used in portable electronics, medical devices, process analytics, and wearable fitness devices among others.
- What package options are available for the OPA391DCKR?
The OPA391DCKR is available in small package options such as SC-70 and DSBGA.
