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Texas Instruments OPA2991IDDFR
- Part No.:
- OPA2991IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
OPA2991IDDFR.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT TSOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:62,430
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Product details
Overview
OPA2991IDDFR from Texas Instruments is a dual-channel, 40-V rail-to-rail input/output operational amplifier optimized for precision industrial signal conditioning. It delivers ±125 µV max offset voltage, 4.5 MHz gain-bandwidth, 21 V/µs slew rate, and operates from ±1.35 V to ±20 V (or 2.7 V to 40 V), enabling high-side current sensing and SAR ADC reference buffering in programmable logic controllers.
For engineers reviewing the OPA2991IDDFR datasheet, OPA2991IDDFR pinout, OPA2991IDDFR application, or OPA2991IDDFR equivalent, key selection criteria include low-noise (10.8 nV/√Hz at 1 kHz), robust EMI rejection, shutdown control per channel, and validated operation across –40°C to +125°C with 1 nF capacitive load drive capability.
Technical Context
The OPA2991IDDFR implements a dual-channel, fully differential input architecture supporting common-mode voltages extending to both supply rails - enabling direct interfacing with multiplexed sensor arrays and high-voltage level translation circuits. Its MUX-friendly inputs tolerate differential inputs up to the supply rails and support open-loop comparator operation without latch-up.
Each amplifier features independent shutdown control (SHDN1/SHDN2), low 560 µA quiescent current per channel, and high output current (±75 mA) with rail-to-rail swing - critical for driving ADC reference buffers and active filters in data-acquisition systems operating at 40 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 2.7 V to 40 V (±1.35 V to ±20 V): supports single- and split-supply industrial systems without level-shifting. |
| Offset Voltage | ±125 µV (max): enables accurate DC-coupled amplification in precision current-sensing applications. |
| Gain-Bandwidth | 4.5 MHz: sufficient for anti-aliasing filtering and fast-settling ADC driver stages (2.5 µs to 0.01%). |
| Slew Rate | 21 V/µs: maintains fidelity on fast transients in high-voltage sensor interfaces and audio preamps. |
| Input Noise | 10.8 nV/√Hz @ 1 kHz: ensures minimal added noise in low-level signal chains like thermocouple amplifiers. |
| Capacitive Load Drive | 1 nF: allows direct connection to ADC input capacitance or long PCB traces without stability compensation. |
| EMI Rejection | Integrated EMI/RFI filters on inputs and supplies: improves immunity in noisy factory-floor environments. |
Pinout & Package
OPA2991IDDFR is housed in an 8-pin SOT-23 (DDF) package measuring 2.90 mm × 1.60 mm, with exposed pad connected to V– for thermal performance. The package supports surface-mount reflow and is rated for –40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Output, Channel A | Amplified output of first op amp; rail-to-rail swing supports full dynamic range utilization. |
| 2: IN– A | Inverting Input, Channel A | Differential input node; accepts common-mode voltage from V– – 0.1 V to V+ + 0.1 V. |
| 3: IN+ A | Noninverting Input, Channel A | High-impedance input (6 TΩ || 1 pF); enables high-gain, low-bias sensor interfaces. |
| 4: V– | Negative Supply | Reference for both channels; thermal pad must be soldered to PCB ground plane for thermal management. |
| 5: IN+ B | Noninverting Input, Channel B | Independent second channel input; identical specs to Channel A for matched dual-path designs. |
| 6: IN– B | Inverting Input, Channel B | Supports differential configurations or independent single-ended use in multi-channel DAQ systems. |
| 7: OUT B | Output, Channel B | Second rail-to-rail output; enables dual-sensor conditioning or redundant signal paths. |
| 8: V+ | Positive Supply | 40-V tolerant supply pin; powers both amplifiers and internal bias circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode extends to supply rails; output swings within 5 mV of rails (no load, 40 V), preserving signal headroom. |
| Low offset drift | ±0.3 µV/°C ensures stable DC accuracy over temperature in uncalibrated industrial sensors. |
| MUX-friendly inputs | Inputs operate linearly with differential voltages up to supply rails and function reliably in open-loop comparator mode. |
| Per-channel shutdown | SHDN1/SHDN2 pins (not present on DDF package) are omitted - OPA2991IDDFR is non-shutdown variant per TI documentation. |
| High CMRR | 130 dB (typical) rejects interference in high-impedance sensor nodes and noisy PLC backplanes. |
Applications
| High-Side Current Sensing | SAR ADC Reference Buffer |
|---|---|
|
Use Scenario: Monitoring motor phase current in 24-V industrial drives using shunt resistor placed between load and supply rail. IC Role / Device Role / Timing Role: Amplifies small differential voltage across shunt while rejecting high common-mode voltage (up to 24 V). Use Value: ±125 µV offset and 130 dB CMRR enable <1% error at 100-mA sense current without calibration. |
Use Scenario: Driving the reference input of a 16-bit SAR ADC in a battery-powered data logger. IC Role / Device Role / Timing Role: Low-noise, low-drift buffer isolates precision voltage reference from ADC switching transients. Use Value: 10.8 nV/√Hz noise and 21 V/µs slew rate prevent code flicker and ensure <1-LSB settling before conversion. |
| Multiplexed Data Acquisition | Programmable Logic Controller Analog Input |
|
Use Scenario: Signal conditioning for 8-channel analog input module with analog multiplexer feeding shared ADC. IC Role / Device Role / Timing Role: Dual op amps condition two simultaneous sensor channels (e.g., temperature + pressure) before multiplexing. Use Value: MUX-friendly inputs tolerate rail-to-rail differential signals; 1 nF drive capability eliminates external isolation resistors. |
Use Scenario: Front-end amplification for 4–20 mA loop receivers and RTD interfaces in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Precision gain stage with wide 40-V supply tolerance accommodates field wiring transients and 24-V system rails. Use Value: 4.5-MHz GBW and ±75 mA output current support fast step response and drive heavy filter loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2182IDR | Lower offset (±4 µV), higher cost, no rail-to-rail output; 5.7 MHz GBW, 20 V/µs slew. | Better DC accuracy but limited output swing reduces usable dynamic range in 40-V systems. | Select when ultra-low offset dominates over rail-to-rail output and supply voltage exceeds 20 V. |
| AD8638ARZ-REEL7 | Higher offset (±150 µV), lower bandwidth (1.2 MHz), rail-to-rail I/O, 1.8–36 V supply. | Lower power (220 µA/ch) and cost, but insufficient bandwidth for fast-settling ADC drivers. | Select for cost-sensitive, low-bandwidth industrial sensors where 4.5 MHz GBW is unnecessary. |
Compared with OPA2991IDDFR, OPA2182IDR trades rail-to-rail output and 40-V operation for microvolt-level DC precision, while AD8638ARZ-REEL7 sacrifices speed and voltage range for lower cost and quiescent current - making OPA2991IDDFR optimal for high-voltage, high-fidelity dual-channel signal chains.
Availability
OPA2991IDDFR is available at Aetrix Electronics and suitable for high-side current sensing, SAR ADC reference buffering, multiplexed data-acquisition systems, and programmable logic controller analog input modules requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA2991IDDFR 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 decades of expertise in precision amplifiers and industrial-grade IC design.
The OPAx991 family was developed specifically for high-voltage industrial signal conditioning - emphasizing rail-to-rail operation, low drift, EMI resilience, and robust capacitive load drive in harsh environments.
FAQ
What is the maximum supply voltage rating for the OPA2991IDDFR?
The OPA2991IDDFR supports a total supply voltage (V+ to V–) of up to 40 V, with absolute maximum ratings allowing 42 V transient tolerance. It operates across ±1.35 V to ±20 V (split) or 2.7 V to 40 V (single), making it suitable for 24-V and 36-V industrial systems. This rating is confirmed in Section 6.1 Absolute Maximum Ratings of the SBOS969F datasheet.
Does the OPA2991IDDFR include shutdown functionality?
No, the OPA2991IDDFR does not include shutdown pins. The DDF package (SOT-23-8) variant lacks SHDN1/SHDN2 terminals - only the RUG (X2QFN-10) and DGS (VSSOP-10) variants of OPA2991S provide per-channel shutdown. This is explicitly stated in Table 5-4 (Pin Functions: OPA2991S) and confirmed by the absence of shutdown-related pins in Figure 5-4 (OPA2991 D/DDR/DDF/DGK/PW pinout).
What is the typical input voltage noise density of the OPA2991IDDFR?
The OPA2991IDDFR has a typical input voltage noise density of 10.8 nV/√Hz at 1 kHz, as specified in Section 6.7 Electrical Characteristics under the EN parameter. This value is consistent across all OPAx991 family members and is measured with RL = 10 kΩ, VCM = VS/2, and TA = 25°C - critical for low-noise sensor front-ends.
Can the OPA2991IDDFR drive a 1-nF capacitive load stably?
Yes, the OPA2991IDDFR is characterized to drive up to 1 nF capacitive load without external compensation, as stated in both the Features list and Section 6.7 Electrical Characteristics (CLOAD = 1000 pF). This capability is enabled by its robust internal compensation and high output current (±75 mA), making it ideal for direct connection to ADC inputs or long traces.
What is the common-mode input voltage range for the OPA2991IDDFR?
The OPA2991IDDFR supports a common-mode input voltage range from (V–) – 0.1 V to (V+) + 0.1 V, as specified in Section 6.7 Electrical Characteristics (VCM parameter). This rail-to-rail input capability allows direct interfacing with sensors operating near supply rails - such as high-side current shunts or bridge amplifiers - without level-shifting circuitry.
OPA2991IDDFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 21V/µs
- Gain Bandwidth Product:
- 4.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 pA
- Voltage - Input Offset:
- 125 µV
- Current - Supply:
- 560µA (x2 Channels)
- Current - Output / Channel:
- 75 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 40 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
OPA2991IDDFR FAQ
1.How can I place an order for OPA2991IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2991IDDFR 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 OPA2991IDDFR reliable?
The price and inventory of OPA2991IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2991IDDFR is usually 5 days.
3.What payment methods are accepted for OPA2991IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2991IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2991IDDFR?
OPA2991IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2991IDDFR 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 OPA2991IDDFR?
For technical support, including OPA2991IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2991IDDFR requirements.
6.How does Aetrix verify that OPA2991IDDFR is sourced from the original manufacturer or authorized distributors?
All OPA2991IDDFR 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 OPA2991IDDFR meets industry standards.
7.What is the process for return or replacement of OPA2991IDDFR?
All OPA2991IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2991IDDFR, 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 OPA2991IDDFR part is unused and in its original packaging.
Return procedure for OPA2991IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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