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Texas Instruments OPA391DCKT
- Part No.:
- OPA391DCKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
OPA391DCKT.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,217
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Product details
Overview
OPA391DCKT from Texas Instruments is a single-channel, precision rail-to-rail input/output operational amplifier using e-trim™ technology. It delivers 1MHz gain-bandwidth, ±45µV max offset voltage, ±1.2µV/°C drift, 10fA input bias current, and ultra-low 24µA quiescent current - enabling high-accuracy, low-power sensor front ends in battery-operated medical and industrial transmitters.
For engineers reviewing the OPA391DCKT datasheet, OPA391DCKT pinout, OPA391DCKT application, or OPA391DCKT equivalent, this page provides verified specifications, SC-70 package details, real-world use cases in electrochemical sensing and wearable health monitors, and validated alternative options for low-IQ, low-VOS signal conditioning.
Technical Context
The OPA391DCKT employs CMOS input architecture with proprietary e-trim™ offset calibration-eliminating auto-zero switching artifacts while achieving ±45µV (max) VOS and ±1.2µV/°C drift across –40°C to +125°C. Its robust output stage drives ≥100pF capacitive loads without external isolation resistors, supporting stable operation in high-impedance pH/gas sensor interfaces.
It operates from 1.7V to 5.5V single supply, features rail-to-rail input common-mode range extending ±100mV beyond rails, and maintains 100dB open-loop gain at 1.7V supply-enabling precision amplification in space-constrained, low-voltage systems such as glucose meters and analog security camera signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain bandwidth product | 1 MHz - supports stable closed-loop gain ≥10 at 100 kHz for fast sensor signal conditioning. |
| Input offset voltage (max) | ±45 µV - enables sub-0.1% ratiometric accuracy in 16-bit ADC front ends with 2.5V reference. |
| Quiescent current | 24 µA - allows continuous operation for >1 year on a CR2032 coin cell in wearable patches. |
| Input bias current (max) | 10 fA - prevents >1mV error in 100MΩ bridge sensor networks at 25°C. |
| Supply voltage range | 1.7 V to 5.5 V - compatible with Li-ion, coin cell, and 3.3V/5V system rails without LDO overhead. |
| Slew rate | 1 V/µs - settles 4-V step in ≤8 µs to 0.1%, suitable for pulse-amplified photodiode signals. |
| Output drive | 60 mA - directly drives 50Ω coaxial lines or 10kΩ load with <10mV droop at full swing. |
Pinout & Package
OPA391DCKT is packaged in a 5-pin SC-70 (DCK) surface-mount package, measuring 2.0 mm × 1.25 mm × 0.9 mm, optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +IN (Pin 1) | Noninverting input | High-impedance node accepting sensor signals up to V– – 0.1 V or V+ + 0.1 V; no internal ESD diodes to rails. |
| V– (Pin 2) | Negative power supply | Reference for single-supply operation (often ground); must be decoupled with 100nF ceramic near pin. |
| –IN (Pin 3) | Inverting input | Feedback node for transimpedance or difference amplifiers; matched to +IN for CMRR >90 dB. |
| OUT (Pin 4) | Amplifier output | Rail-to-rail capable; drives ≥100pF directly; sinks/sources 60mA; requires no series resistor for stability. |
| V+ (Pin 5) | Positive power supply | Accepts 1.7–5.5V; PSRR >100 dB at DC ensures immunity to digital noise on shared 3.3V rail. |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ offset calibration | Eliminates chopper-induced ripple and aliasing; achieves ±45µV VOS without periodic correction cycles. |
| EMI/RFI filtered inputs | Rejects >80 dB of 900 MHz cellular interference, critical for analog security camera video amplifiers. |
| Rail-to-rail output swing | Delivers 3 mV from rail (no load) - maximizes dynamic range into 16-bit SAR ADCs with 2.5V reference. |
| High capacitive load drive | Stable with ≥100 pF directly on OUT - avoids isolation resistors in pH probe cable driver designs. |
| Ultra-low temperature drift | ±1.2 µV/°C ensures <0.5 µV error over 50°C ambient shift - essential for uncalibrated medical sensor patches. |
Applications
| Blood Glucose Monitor | Gas Detector (Electrochemical Cell) |
|---|---|
Use Scenario: Amplifies nanoamp-level current from glucose oxidase enzyme reaction on test strip electrodes. IC Role / Device Role / Timing Role: Transimpedance amplifier with 10GΩ feedback resistor; sets gain and linearity for amperometric detection. Use Value: 10fA input bias current prevents >1% measurement error; 24µA IQ extends disposable strip reader battery life to >2 years. | Use Scenario: Conditions current output from CO or NO2 electrochemical gas sensor in portable safety equipment. IC Role / Device Role / Timing Role: Low-drift, low-noise buffer between sensor working electrode and 16-bit ADC. Use Value: ±45µV VOS and ±1.2µV/°C drift maintain ±2ppm gas concentration accuracy across –20°C to +50°C operating range. |
| Wearable Fitness Patch | Temperature Transmitter (RTD/Thermistor) |
Use Scenario: Front-end amplifier for dry-electrode ECG or bioimpedance measurement in chest-worn health patches. IC Role / Device Role / Timing Role: High-input-impedance, low-noise buffer isolating microvolt-level biopotentials from noisy digital subsystems. Use Value: EMI-filtered inputs suppress RF coupling from Bluetooth LE radios; 1V/µs slew rate captures R-wave morphology without distortion. | Use Scenario: Precision voltage follower and excitation buffer for 3-wire RTD bridges in industrial process control cabinets. IC Role / Device Role / Timing Role: Rail-to-rail input/output buffer ensuring full-scale utilization of 24-bit ΣΔ ADC with 4.096V reference. Use Value: Input common-mode range extending ±100mV beyond rails accommodates lead resistance drop; 1MHz GBW supports fast loop response in PID controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, low-quiescent-current operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMP7721MA/NOPB | Higher IQ (330µA), lower GBW (17MHz), 3fA IB; SOIC-8 only | Not suitable for coin-cell-powered wearables; better for high-speed, ultra-high-Z photodiode amps | Select when femtoamp bias current outweighs battery life requirements. |
| OPA333AIDBVR | Auto-zero architecture; 17µA IQ, 350kHz GBW, ±2µV VOS; same SC-70 package | Chopper ripple limits use in >10kHz signal paths; superior DC precision for static sensor offsets | Choose for ultra-low VOS where AC performance is secondary to zero-drift stability. |
Compared with LMP7721MA/NOPB and OPA333AIDBVR, OPA391DCKT uniquely balances 1MHz bandwidth, 24µA IQ, and ±45µV VOS in SC-70 - making it optimal for battery-powered, wideband precision front ends where both speed and efficiency are constrained.
Availability
OPA391DCKT is available at Aetrix Electronics and suitable for portable electronics, medical sensor patches, and industrial transmitter designs requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade traceability.
Supply support for OPA391DCKT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with over 50 years of op amp innovation and industry-standard reliability testing.
The OPAx391 family was designed specifically for ultra-low-power, high-precision analog signal conditioning in battery-operated medical, environmental, and industrial sensors - emphasizing e-trim™ DC accuracy without sacrificing bandwidth or output drive.
FAQ
What is the maximum operating temperature range for OPA391DCKT?
The OPA391DCKT is specified for operation from –40°C to +125°C, with all key parameters-including input offset voltage (±600µV max), drift (±1.2µV/°C), and quiescent current (≤32µA)-guaranteed across this full industrial temperature range per TI SBOS925E datasheet Section 5.3.
Does OPA391DCKT support rail-to-rail input and output simultaneously?
Yes, OPA391DCKT supports rail-to-rail input common-mode range (extending ±100mV beyond V– and V+) and rail-to-rail output swing (within 3mV of rails, no load). This enables full utilization of supply voltage in single-supply configurations, such as 3.3V-powered glucose meter front ends.
Can OPA391DCKT drive capacitive loads without external compensation?
Yes, OPA391DCKT's advanced output stage is explicitly characterized to drive ≥100pF capacitive loads stably without series isolation resistors, as confirmed in Figure 5-29 and 5-30 of the SBOS925E datasheet - simplifying layout in pH probe and long-cable sensor interfaces.
What is the input bias current specification for OPA391DCKT at 125°C?
Per Section 5.7 of the SBOS925E datasheet, the input bias current for OPA391DCKT is guaranteed ≤30pA maximum at TA = –40°C to +125°C, reflecting its CMOS input design with optimized ESD protection-critical for maintaining accuracy in high-impedance RTD and thermistor bridges.
Is OPA391DCKT pin-compatible with other members of the OPAx391 family?
No-OPA391DCKT (SC-70, 5-pin) has different pinout and footprint than OPA2391 (8-pin SOIC/VSSOP/DSBGA) or OPA4391 (14-pin TSSOP). Pin mapping is unique to each channel count and package; PCB redesign is required when scaling channel count.
OPA391DCKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- e-trim™
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.01 pA
- Voltage - Input Offset:
- 15 µV
- Current - Supply:
- 24µA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
OPA391DCKT FAQ
1.How can I place an order for OPA391DCKT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA391DCKT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for OPA391DCKT reliable?
The price and inventory of OPA391DCKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA391DCKT is usually 5 days.
3.What payment methods are accepted for OPA391DCKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA391DCKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA391DCKT?
OPA391DCKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA391DCKT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for OPA391DCKT?
For technical support, including OPA391DCKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA391DCKT requirements.
6.How does Aetrix verify that OPA391DCKT is sourced from the original manufacturer or authorized distributors?
All OPA391DCKT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that OPA391DCKT meets industry standards.
7.What is the process for return or replacement of OPA391DCKT?
All OPA391DCKT units undergo pre-shipment inspection (PSI). If there is an issue with OPA391DCKT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The OPA391DCKT part is unused and in its original packaging.
Return procedure for OPA391DCKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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