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Texas Instruments OPA4391PWR
- Part No.:
- OPA4391PWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4391PWR.pdf
- Description:
- QUAD, MICROPOWER, HIGH SPEED-TO-
- Quantity:
- Payment:
- Shipping:
Inventory:4,045
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Product details
Overview
OPA4391PWR from Texas Instruments is a quad-channel, precision rail-to-rail input/output operational amplifier featuring e-trim™ technology. It delivers ±45 µV maximum input offset voltage, 1 MHz gain-bandwidth product, 24 µA quiescent current per amplifier, and 10 fA 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 OPA4391PWR datasheet, OPA4391PWR pinout, OPA4391PWR application, or OPA4391PWR equivalent, key selection criteria include guaranteed low offset drift (±1.2 µV/°C), operation down to 1.7 V supply, input common-mode range extending 100 mV beyond rails, and robust capacitive-load drive capability - all critical for ratiometric electrochemical and bridge-based sensing systems.
Technical Context
The OPA4391PWR employs Texas Instruments' proprietary e-trim™ CMOS process to achieve ultra-low offset without auto-zero or chopper switching, eliminating switching artifacts and enabling clean DC-coupled performance. Its input stage supports rail-to-rail common-mode operation with ±100 mV beyond supply rails, while the output stage drives ≥100 pF loads stably without isolation resistors.
Designed for single-supply (1.7–5.5 V) or dual-supply (±0.85–±2.75 V) use, the device maintains 100 dB CMRR over –40°C to +85°C and achieves 1 V/µs slew rate with 8 µs 0.1% settling time - balancing precision, speed, and power efficiency in compact TSSOP-14 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | Quad - enables four independent precision gain stages or multi-sensor signal chains on one IC. |
| Gain bandwidth | 1 MHz - supports stable unity-gain operation and closed-loop bandwidth up to ~900 kHz at G = 10. |
| Input offset voltage | ±45 µV max - ensures ≤0.0045% error in 1-V full-scale ratiometric measurements (e.g., bridge sensors). |
| Quiescent current | 24 µA per amplifier - allows continuous operation for >1 year on a 200-mAh coin cell in portable medical devices. |
| Input bias current | 10 fA typical - minimizes voltage error across >100-MΩ source impedances (e.g., pH electrodes, photodiodes). |
| Supply voltage | 1.7 V to 5.5 V - compatible with Li-ion, Li-SOCl₂, and 3.3 V/5 V system rails without level-shifting. |
| Output swing | Rail-to-rail - delivers full dynamic range into ADCs with 1.8 V or 3.3 V reference voltages. |
Pinout & Package
PW package: 14-pin TSSOP (4.4 mm × 5.0 mm, 0.65 mm pitch), thermally optimized for PCB heat dissipation (RθJA = 109.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT A (Pin 1) | Output, Channel A | Capable of sourcing/sinking 60 mA; rail-to-rail swing supports direct interface to SAR ADC drivers. |
| –IN A (Pin 2) | Inverting input, Channel A | High-impedance CMOS node; no internal ESD diodes to rails - enables differential input beyond supply limits. |
| +IN A (Pin 3) | Noninverting input, Channel A | Matches –IN A in bias current and offset; used for unity-gain buffers or noninverting amplifiers. |
| V+ (Pin 4) | Positive supply | Accepts 1.7–5.5 V single supply or highest rail in dual-supply configuration. |
| +IN B (Pin 5) | Noninverting input, Channel B | Electrically isolated from other channels; supports independent gain/feedback networks. |
| –IN B (Pin 6) | Inverting input, Channel B | Identical specs to Pin 2; enables matched dual instrumentation amplifier topologies. |
| OUT B (Pin 7) | Output, Channel B | Same drive strength and settling behavior as OUT A; supports parallel output configurations. |
| OUT C (Pin 8) | Output, Channel C | Independent output stage; no crosstalk with Channels A/B per datasheet characterization. |
| –IN C (Pin 9) | Inverting input, Channel C | Validated for operation at VCM = (V–) – 0.1 V to (V+) + 0.1 V across temperature. |
| +IN C (Pin 10) | Noninverting input, Channel C | Paired with –IN C for third channel; supports high-Z sensor multiplexing. |
| +IN D (Pin 12) | Noninverting input, Channel D | Final channel input; layout symmetry with Pins 3/5/10 ensures matched parasitics. |
| –IN D (Pin 13) | Inverting input, Channel D | Supports differential input configurations up to ±100 mV beyond V+ or V–. |
| OUT D (Pin 14) | Output, Channel D | Full 60 mA drive capability; validated for capacitive loads up to 1 nF with RISO = 50 Ω. |
| V– (Pin 11) | Negative supply | Reference for all four amplifiers; must be connected even in single-supply mode (typically GND). |
Key Features
| Feature | Design Value |
|---|---|
| e-trim™ offset calibration | Eliminates need for external trimming or auto-zero circuitry - reduces board area and eliminates switching noise in DC-critical applications. |
| Rail-to-rail I/O | Enables full utilization of ADC input range when powered from same supply (e.g., 3.3 V MCU + 3.3 V ADC reference). |
| EMI/RFI filtered inputs | EMIRR > 100 dB at 900 MHz - suppresses cellular/GSM interference in wearable fitness monitors and analog security cameras. |
| High capacitive-load drive | Stable with ≥100 pF directly on output - avoids need for series isolation resistors in anti-alias filter designs. |
| Ultra-low IQ (24 µA) | Per-amplifier current enables quad-channel precision amplification within 100 µA total system budget - ideal for always-on sensor nodes. |
Applications
| Blood Glucose Monitor | Pressure Transmitter |
|---|---|
Use Scenario: Amplifies weak current from glucose oxidase enzyme reaction across disposable test strip electrodes. IC Role / Device Role / Timing Role: High-input-impedance transimpedance amplifier with <10 fA bias current to prevent electrode polarization errors. Use Value: ±45 µV offset ensures <0.5% measurement error at 10 mV full scale; 1.7 V operation extends battery life in handheld meters. | Use Scenario: Conditions output of piezoresistive bridge in industrial pressure sensors with 4–20 mA loop or digital output. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front end with matched quad channels for bridge excitation and differential sensing. Use Value: ±1.2 µV/°C drift prevents thermal zero-shift errors in unheated field transmitters operating from –40°C to +85°C. |
| Gas Detector | Medical Sensor Patch |
Use Scenario: Amplifies nanoamp-level current from electrochemical gas cells (CO, NO₂, O₃) in portable air quality monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift transimpedance stage with rail-to-rail output driving low-power ADC. Use Value: 0.91 µVRMS (0.1–10 Hz) noise floor resolves sub-ppm gas concentrations; 24 µA IQ enables multi-day battery operation. | Use Scenario: Signal conditioning for dry-electrode ECG/EMG in disposable wireless patches worn for 72+ hours. IC Role / Device Role / Timing Role: Quad-channel biopotential amplifier: 3 leads + reference buffer, all sharing single low-noise supply domain. Use Value: Matched quad topology minimizes inter-channel phase mismatch; 109.6°C/W RθJA prevents skin-heating concerns in conformal wearables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4197IPWR | Higher IQ (100 µA), lower offset (±5 µV), no e-trim - uses auto-zero architecture with 10 µV p-p switching noise. | Not suitable for DC-critical, low-noise applications like pH or amperometric sensors due to chopping artifacts. | Select OPA4197IPWR only when ultra-low offset dominates over noise and power constraints. |
| LTC6090CGN#PBF | Higher supply range (±7.5 V), higher IQ (1.1 mA), higher GBW (28 MHz) - designed for high-voltage precision, not ultra-low-power. | Overqualified for 1.7–5.5 V battery-powered systems; incompatible with coin-cell energy budgets. | Choose LTC6090CGN#PBF only for high-voltage (>10 V) industrial signal chains requiring >20 VOUT swing. |
Compared with OPA4197IPWR and LTC6090CGN#PBF, the OPA4391PWR uniquely balances sub-50 µV offset, 24 µA IQ, and 10 fA bias current - making it the only quad op amp qualified for simultaneous low-noise, low-drift, and multi-year battery operation in Class II medical and industrial IoT endpoints.
Availability
OPA4391PWR is available at Aetrix Electronics and suitable for blood glucose monitoring, industrial pressure transmitters, portable gas detection, and medical sensor patch applications requiring stable component supply, long-term lifecycle support, and traceable TI production lots.
Supply support for OPA4391PWR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPAx391 family was engineered specifically for ultra-low-power, high-precision sensor signal conditioning - targeting battery-operated medical, environmental, and industrial measurement systems where offset, drift, and quiescent current are co-constrained design parameters.
FAQ
What is the maximum operating temperature range for the OPA4391PWR?
The OPA4391PWR is specified for operation from –40°C to +85°C ambient temperature when packaged in the PW (TSSOP-14) variant. This range is confirmed in Section 5.3 of the SBOS925E datasheet and applies to all electrical characteristics in the OPA4391PW column. Junction temperature must remain ≤150°C under steady-state conditions per Absolute Maximum Ratings.
Does the OPA4391PWR support true rail-to-rail input common-mode voltage?
Yes, the OPA4391PWR supports input common-mode voltage from (V–) – 0.1 V to (V+) + 0.1 V across the full temperature range, verified in Section 5.8 of the datasheet. This extends 100 mV beyond both supply rails - enabling direct interfacing with overvoltage-tolerant sensors and simplifying level-shifting in single-supply systems.
Can the OPA4391PWR drive a 1000-pF capacitive load without oscillation?
The OPA4391PWR is characterized to drive ≥100 pF loads stably without external compensation (Figure 5-29/5-30). For 1000-pF loads, TI recommends adding a 25-Ω to 50-Ω isolation resistor in series with the output (RISO) to maintain phase margin - a design practice validated in the datasheet's capacitive-load overshoot plots and application guidance.
Is the OPA4391PWR pin-compatible with other OPAx391 variants like OPA4391IDR?
No - the OPA4391PWR (TSSOP-14) is not pin-compatible with OPA4391IDR (SOIC-14), despite identical channel count and function. Pin numbering differs between PW and DR packages: for example, V– is Pin 11 in PW but Pin 4 in DR. Layout redesign is required when substituting packages.
What is the typical input voltage noise density of the OPA4391PWR at 1 kHz?
The typical input voltage noise density of the OPA4391PWR at 1 kHz is 60 nV/√Hz, as specified in Section 5.7 and 5.8 of the SBOS925E datasheet. This value is consistent across all OPAx391 variants and enables resolution of microvolt-level signals in low-frequency sensor applications such as strain gauge and thermopile amplification.
OPA4391PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- OPAx391
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Standard
- Number of Circuits:
- 4
- 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:
- 23.5µA (x4 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:
- 14-TSSOP
OPA4391PWR FAQ
1.How can I place an order for OPA4391PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4391PWR 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 OPA4391PWR reliable?
The price and inventory of OPA4391PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4391PWR is usually 5 days.
3.What payment methods are accepted for OPA4391PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4391PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4391PWR?
OPA4391PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4391PWR 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 OPA4391PWR?
For technical support, including OPA4391PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4391PWR requirements.
6.How does Aetrix verify that OPA4391PWR is sourced from the original manufacturer or authorized distributors?
All OPA4391PWR 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 OPA4391PWR meets industry standards.
7.What is the process for return or replacement of OPA4391PWR?
All OPA4391PWR units undergo pre-shipment inspection (PSI). If there is an issue with OPA4391PWR, 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 OPA4391PWR part is unused and in its original packaging.
Return procedure for OPA4391PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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