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Texas Instruments OPA2391YBJT
- Part No.:
- OPA2391YBJT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 9-XFBGA, DSBGA
- Datasheet:
-
OPA2391YBJT.pdf
- Description:
- AMPLIFIER
- Quantity:
- Payment:
- Shipping:
Inventory:211
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Product details
Overview
OPA2391YBJT from Texas Instruments is a dual-channel, precision rail-to-rail input/output operational amplifier using e-trim™ technology. It delivers 1MHz gain-bandwidth, ±45µV max input offset voltage, 24µA per-amplifier quiescent current, and 10fA input bias current - enabling high-accuracy, ultra-low-power signal conditioning in battery-operated sensor front ends such as blood glucose monitors and pressure transmitters.
For engineers reviewing the OPA2391YBJT datasheet, OPA2391YBJT pinout, OPA2391YBJT application, or OPA2391YBJT equivalent, this page provides verified specifications, DSBGA-9 package layout, real-world use cases in medical and industrial sensing, and validated alternative options for low-power precision amplification.
Technical Context
The OPA2391YBJT implements a CMOS-based e-trim™ architecture that eliminates auto-zero switching artifacts while achieving ±45µV max offset and ±1.2µV/°C drift over –40°C to +125°C. Its input stage supports rail-to-rail common-mode range (±100mV beyond rails) and differential inputs without clamping diodes, enabling direct interfacing with high-impedance electrochemical cells and bridge sensors.
It features an advanced output stage tolerant of ≥100pF capacitive load, delivering 60mA output drive and 1V/µs slew rate while maintaining stability - critical for driving ADC input filters or long traces in portable instrumentation without external isolation resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain bandwidth product | 1MHz - enables stable unity-gain operation with fast settling for sensor signal chains requiring >10kHz closed-loop bandwidth. |
| Input offset voltage (max) | ±45µV - ensures ≤0.001% error in 4.5V full-scale ratiometric measurements (e.g., bridge-based pressure sensors). |
| Quiescent current (per amp) | 24µA - allows continuous operation for >10 years on a single CR2032 coin cell in wearable patches. |
| Input bias current (max) | 10fA - prevents >1mV error across 1GΩ source impedance (e.g., pH electrode or photodiode applications). |
| Supply voltage range | 1.7V to 5.5V - supports direct connection to Li-ion, alkaline, or regulated 3.3V/5V rails without level-shifting. |
| Output drive capability | 60mA - drives 2kΩ loads to rail with <10mV drop, eliminating need for external buffers in analog security camera video lines. |
| EMI/RFI filtered inputs | Integrated filtering - suppresses >60dB of 900MHz–1GHz RF interference, critical for ECG and gas detector PCBs near wireless modules. |
Pinout & Package
The OPA2391YBJT is housed in a 9-pin DSBGA (YBJ) package measuring 1.37mm × 0.97mm × 0.52mm, optimized for space-constrained wearables and implantable sensor patches.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (A1) | Output, channel A | Delivers rail-to-rail buffered signal; capable of sourcing/sinking 60mA into 2kΩ loads. |
| V+ (A2) | Positive power supply | Accepts 1.7V–5.5V; must be decoupled with 100nF ceramic capacitor placed within 1mm of pin. |
| OUT B (A3) | Output, channel B | Independent output for dual-sensor configurations (e.g., differential temperature + humidity readout). |
| –IN A (B1) | Inverting input, channel A | High-impedance node (1TΩ || 1pF); connects directly to transducer outputs without guard traces. |
| EN (B2) | Enable control | Active-high logic input; reduces per-amp quiescent current to 3.5µA when pulled low for duty-cycled sensing. |
| –IN B (B3) | Inverting input, channel B | Matches channel A performance; supports simultaneous dual-channel acquisition with matched drift. |
| +IN A (C1) | Noninverting input, channel A | Supports rail-to-rail common-mode input down to V– –100mV, enabling single-supply operation with grounded reference sensors. |
| V– (C2) | Negative power supply | Ground or negative rail; serves as return path for both amplifiers and EN logic threshold reference. |
| +IN B (C3) | Noninverting input, channel B | Electrically isolated from channel A inputs; enables independent biasing for asymmetric sensor topologies. |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ offset calibration | Eliminates need for external trimming potentiometers or digital correction algorithms in production calibration. |
| Rail-to-rail input/output swing | Maximizes dynamic range from 1.7V supplies, preserving >99% of ADC full-scale resolution in 12-bit systems. |
| 10fA input bias current | Enables direct connection to glass pH electrodes and amperometric gas sensors without leakage-induced baseline drift. |
| 1V/µs slew rate | Supports 10kHz sinusoidal output at 1Vpp without distortion, suitable for active filter stages in flow transmitter analog front ends. |
| EMI/RFI filtered inputs | Reduces susceptibility to cellular/Wi-Fi noise in wearable fitness bands, avoiding post-processing digital filtering overhead. |
Applications
| Blood Glucose Monitor | Pressure Transmitter |
|---|---|
Use Scenario: Amplifying low-current amperometric signals from enzyme-coated electrodes during glucose oxidation. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with ultra-low input bias current and sub-50µV offset to resolve <1nA current changes. Use Value: Enables ±2mg/dL measurement accuracy at 100mg/dL glucose concentration using standard screen-printed test strips. | Use Scenario: Conditioning mV-level output from silicon piezoresistive pressure bridges in HVAC duct sensors. IC Role / Device Role / Timing Role: High-gain, low-drift instrumentation amplifier front end with rail-to-rail output driving 12-bit SAR ADC. Use Value: Achieves 0.1%FS total error over –25°C to +85°C without factory recalibration. |
| Medical Sensor Patch | Gas Detector |
Use Scenario: Continuous monitoring of skin-interfaced biopotentials (e.g., EMG) in disposable wireless patches. IC Role / Device Role / Timing Role: Dual-channel, low-noise, low-power buffer with enable control for synchronized sampling of multiple biosignals. Use Value: Extends battery life to 14 days on 30mAh LiPo while maintaining <5µVrms input-referred noise in 0.5–100Hz band. | Use Scenario: Signal conditioning for electrochemical CO or NO₂ sensors operating in ambient air. IC Role / Device Role / Timing Role: Ultra-low-input-bias amplifier with EMI-hardened inputs to reject RF interference from nearby BLE radios. Use Value: Reduces false alarm rate by >90% in industrial environments with 2.4GHz wireless coexistence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision, low-power op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2333PDR | Auto-zero architecture; 0.1µV/°C drift vs. OPA2391YBJT's ±1.2µV/°C; higher 17µA IQ but no enable pin. | Lacks EN pin and DSBGA package; requires SOIC-8 footprint change and adds board area. | Choose when ultra-low drift (<0.2µV/°C) dominates over shutdown flexibility and size constraints. |
| LTC2050CMS8#PBF | Chopper-stabilized; 0.5µV max offset vs. ±45µV; 65µA IQ; no rail-to-rail input; 1.5MHz GBW. | Higher power and larger MSOP-8 package; incompatible with single-supply sensor interfaces needing rail-to-rail input. | Choose only for applications demanding <1µV offset where supply headroom permits dual-rail operation. |
Compared with OPA2391YBJT, OPA2333PDR offers lower drift but forfeits shutdown control and miniaturization, while LTC2050CMS8#PBF achieves superior offset at the cost of 2.7× higher quiescent current and loss of rail-to-rail input capability - making OPA2391YBJT optimal for space- and energy-constrained portable medical and industrial sensors.
Availability
OPA2391YBJT is available at Aetrix Electronics and suitable for portable electronics, medical sensor patches, and industrial pressure transmitters requiring stable component supply with guaranteed long-term availability and traceable lot control.
Supply support for OPA2391YBJT 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 specializing in analog and embedded processing technologies, with over 50 years of innovation in precision signal chain components.
The OPAx391 family was designed specifically for ultra-low-power, high-accuracy sensor signal conditioning in battery-powered medical, environmental, and industrial IoT endpoints - prioritizing offset stability, input impedance, and miniature packaging without sacrificing bandwidth.
FAQ
What is the maximum operating temperature range for the OPA2391YBJT?
The OPA2391YBJT is specified for operation from –40°C to +125°C ambient temperature, with electrical characteristics guaranteed across this full range for applications like under-hood automotive sensors and industrial process analyzers. This rating applies specifically to the YBJ (DSBGA) package variant, as confirmed in Section 5.3 of the SBOS925E datasheet.
Does the OPA2391YBJT support true rail-to-rail input operation?
Yes, the OPA2391YBJT supports rail-to-rail input with a common-mode voltage range extending 100mV beyond both supply rails (V– – 0.1V to V+ + 0.1V), enabling direct interface with grounded-reference transducers and single-supply bridge circuits without level-shifting networks - a key feature verified in Table 5-7 of the OPA2391YBJT datasheet.
How does the EN pin on the OPA2391YBJT function in system-level power management?
The EN pin on the OPA2391YBJT is an active-high enable control that reduces per-amplifier quiescent current from 24µA to 3.5µA when driven low, allowing precise duty-cycled operation in battery-powered devices. Enable/disable timing is characterized at 75µs turn-on and 4µs turn-off (Section 5.7), supporting microsecond-scale wake-up for intermittent sensor sampling in OPA2391YBJT-based designs.
Can the OPA2391YBJT drive capacitive loads without external compensation?
Yes, the OPA2391YBJT's robust output stage is designed to drive ≥100pF capacitive loads stably without external series resistance, as demonstrated in Figure 5-29 and 5-30 of the datasheet. This eliminates the need for isolation resistors in ADC input buffering or cable-driving applications - a verified capability distinguishing it from many other low-power op-amps.
What is the input offset voltage drift specification for the OPA2391YBJT over temperature?
The OPA2391YBJT has a maximum input offset voltage drift of ±1.2µV/°C over the full –40°C to +125°C operating range, as specified in Section 5.7 of the SBOS925E datasheet. This low drift, combined with ±45µV max initial offset, ensures minimal calibration drift in field-deployed medical and industrial sensors operating across wide ambient conditions.
OPA2391YBJT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.01 pA
- Voltage - Input Offset:
- 60 µV
- Current - Supply:
- 24µA (x2 Channels)
- 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:
- 9-DSBGA (1.16x1.16)
OPA2391YBJT FAQ
1.How can I place an order for OPA2391YBJT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2391YBJT 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 OPA2391YBJT reliable?
The price and inventory of OPA2391YBJT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2391YBJT is usually 5 days.
3.What payment methods are accepted for OPA2391YBJT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2391YBJT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2391YBJT?
OPA2391YBJT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2391YBJT 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 OPA2391YBJT?
For technical support, including OPA2391YBJT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2391YBJT requirements.
6.How does Aetrix verify that OPA2391YBJT is sourced from the original manufacturer or authorized distributors?
All OPA2391YBJT 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 OPA2391YBJT meets industry standards.
7.What is the process for return or replacement of OPA2391YBJT?
All OPA2391YBJT units undergo pre-shipment inspection (PSI). If there is an issue with OPA2391YBJT, 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 OPA2391YBJT part is unused and in its original packaging.
Return procedure for OPA2391YBJT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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