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Texas Instruments OPA4991IDYYR
- Part No.:
- OPA4991IDYYR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-14 Thin, SOT-23 Variant
- Datasheet:
-
OPA4991IDYYR.pdf
- Description:
- QUAD, 40-V, 4.5-MHZ, LOW-POWER O
- Quantity:
- Payment:
- Shipping:
Inventory:4,246
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Product details
Overview
OPA4991IDYYR from Texas Instruments is a quad-channel, 40-V rail-to-rail input/output operational amplifier with ±125 µV max offset voltage, 4.5 MHz gain-bandwidth, and 21 V/µs slew rate. It operates from ±1.35 V to ±20 V (or 2.7 V to 40 V), delivers ±75 mA output current, and supports high-voltage multiplexed data acquisition systems requiring precision DC performance and robust capacitive load drive up to 1 nF.
For engineers reviewing the OPA4991IDYYR datasheet, OPA4991IDYYR pinout, OPA4991IDYYR application, or OPA4991IDYYR equivalent, this page provides verified technical context, package-specific pin mapping, real-world use cases in industrial sensing and ADC buffering, and validated alternative options for supply continuity and design flexibility.
Technical Context
The OPA4991IDYYR implements a fully differential input stage with common-mode range extending to both supply rails, enabling MUX-friendly operation and open-loop comparator use. Its architecture supports simultaneous high AC performance (10.8 nV/√Hz noise at 1 kHz) and exceptional DC precision (±0.3 µV/°C drift).
Each of its four amplifiers features independent shutdown control, rail-to-rail output swing within 5 mV of rails (no-load, 40 V supply), and stable operation driving ≥1 nF loads-critical for SAR ADC reference buffers and high-side current sensing where signal integrity and settling time (<2.5 µs to 0.01%) are tightly constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 40 V (±1.35 V to ±20 V): supports single-supply industrial sensors and dual-supply test equipment without level-shifting. |
| Input Offset Voltage | ±125 µV (max): enables sub-16-bit accuracy in precision instrumentation without external trimming. |
| Gain-Bandwidth Product | 4.5 MHz: sufficient for driving 1 MSPS SAR ADCs with adequate phase margin (60°) at unity gain. |
| Slew Rate | 21 V/µs: ensures fast settling for 10-V step inputs in <2.5 µs (0.01% error), critical for multiplexed DAQ systems. |
| Output Current | ±75 mA: drives low-impedance loads (e.g., 66 Ω reference buffers) and sustains 1 nF capacitive loads without oscillation. |
| Quiescent Current | 560 µA per amplifier: balances low-power operation with high-speed performance in battery-backed PLC modules. |
| EMI/RFI Rejection | Integrated filters on input/supply pins: maintains signal fidelity in noisy industrial environments (e.g., motor drives, PLC backplanes). |
Pinout & Package
OPA4991IDYYR is packaged in a 14-pin SOT-23 (DYY) body measuring 4.20 mm × 1.90 mm, optimized for space-constrained industrial PCBs while maintaining thermal resistance (RθJA = 110.6 °C/W) suitable for ambient temperatures up to +125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Channel 1 output: rail-to-rail capable, drives 1 nF directly; connects to ADC input or sensor signal chain. |
| 2 | IN1– | Inverting input, channel 1: accepts differential signals up to supply rails; used in transimpedance or current-sense configurations. |
| 3 | IN1+ | Noninverting input, channel 1: supports common-mode voltages from (V–) – 0.1 V to (V+) + 0.1 V for wide-range sensor interfacing. |
| 4 | V+ | Positive supply: accepts up to 40 V; decoupling required near pin for EMI suppression and stability. |
| 5 | IN2+ | Noninverting input, channel 2: identical specs to IN1+; enables independent gain stages in multi-channel analog front-ends. |
| 6 | IN2– | Inverting input, channel 2: matched bias current (±10 pA) minimizes offset errors in precision differential amplifiers. |
| 7 | OUT2 | Channel 2 output: independently shutdown-capable; shares V+ and V– with other channels for compact layout. |
| 8 | OUT3 | Channel 3 output: same rail-to-rail swing and drive strength as OUT1/OUT2; supports parallel signal conditioning paths. |
| 9 | IN3– | Inverting input, channel 3: differential input voltage range extends to supply rails, enabling direct connection to MUX outputs. |
| 10 | V– | Negative supply: lowest potential rail; thermal pad (if present) must be connected to V– per TI layout guidelines. |
| 11 | IN4+ | Noninverting input, channel 4: supports high-side current sensing with VCM up to V+ + 0.1 V. |
| 12 | IN4– | Inverting input, channel 4: matched input capacitance (540 GΩ || 9 pF diff, 6 TΩ || 1 pF cm) preserves bandwidth in high-Z sources. |
| 13 | OUT4 | Channel 4 output: full 4.5 MHz GBW available; used for reference buffering or active filtering in 4-channel DAQ systems. |
| 14 | OUT1 (redundant) | Same as Pin 1; no functional difference - standard quad-opamp pinout repetition for mechanical symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in low-voltage (2.7 V) and high-voltage (40 V) systems without signal clipping. |
| MUX-friendly/comparator inputs | Differential input voltage range extends to supply rails, allowing direct interface with analog multiplexers and open-loop comparator use. |
| High capacitive load drive (1 nF) | Eliminates need for external isolation resistors when driving ADC input capacitors or long traces in industrial I/O modules. |
| Shutdown functionality (per channel) | Reduces quiescent current to 30 µA per disabled amplifier, enabling dynamic power scaling in battery-powered PLCs. |
| Robust EMIRR performance | On-chip EMI/RFI filters suppress >100 MHz interference from switching power supplies and motor drives in factory automation. |
Applications
| Low-Power Audio Preamp | Multiplexed Data-Acquisition System |
|---|---|
Use Scenario: Battery-powered portable audio recorder with 4-channel microphone input and anti-aliasing filtering. IC Role / Device Role / Timing Role: Quad op-amp configures as 4 independent preamplifiers with gain and DC blocking, each driving a shared SAR ADC via analog MUX. Use Value: Rail-to-rail I/O and 10.8 nV/√Hz noise preserve SNR >105 dB across 20 Hz–20 kHz; shutdown mode extends battery life during idle periods. |
Use Scenario: Industrial PLC module acquiring voltage/current from 16 sensors using 4:1 analog MUX and 16-bit SAR ADC. IC Role / Device Role / Timing Role: OPA4991IDYYR buffers MUX output and drives ADC input; four channels condition four simultaneous sensor groups. Use Value: 21 V/µs slew rate and <2.5 µs settling ensure accurate sampling at 1 MSPS; 1 nF drive capability eliminates external RC networks. |
| SAR ADC Reference Buffer | High-Side Current Sensing |
Use Scenario: Precision 16-bit SAR ADC system using REF3140 (4.096 V) reference with tight LSB error budget. IC Role / Device Role / Timing Role: One channel of OPA4991IDYYR buffers reference voltage, driving ADC REF pin and internal DAC reference path. Use Value: ±125 µV offset and ±0.3 µV/°C drift contribute <0.002% gain error over –40°C to +125°C, preserving ADC linearity. |
Use Scenario: Motor drive inverter monitoring phase current via shunt resistor; signal conditioned before isolation amplifier. IC Role / Device Role / Timing Role: Configured as high-side current sense amplifier with gain network; inputs tolerate common-mode up to 40 V. Use Value: Common-mode range to supply rail allows direct shunt measurement at 40 V bus; 130 dB CMRR rejects PWM noise coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4197IDR | Lower noise (5.2 nV/√Hz), higher GBW (10 MHz), but only ±2.25 V to ±18 V supply range; no shutdown function. | Better for high-speed, low-noise applications like precision oscilloscope front-ends; unsuitable for 40-V industrial buses. | Select OPA4197IDR when noise and speed outweigh voltage range and power management needs. |
| LM324BDR | Wider temp range (–40°C to 125°C), lower cost, but higher offset (±3 mV), lower GBW (1.2 MHz), no rail-to-rail output. | Suitable for non-critical industrial controls where 12-bit accuracy suffices; cannot replace OPA4991IDYYR in 16-bit DAQ or audio. | Choose LM324BDR only for cost-sensitive, low-performance applications where 40-V operation and precision are not required. |
Compared with OPA4197IDR and LM324BDR, the OPA4991IDYYR uniquely combines 40-V operation, rail-to-rail I/O, shutdown control, and sub-130 µV offset-making it irreplaceable in high-voltage, precision, power-aware industrial signal chains.
Availability
OPA4991IDYYR is available at Aetrix Electronics and suitable for programmable logic controllers, high-voltage multiplexed data-acquisition systems, and SAR ADC reference buffering requiring stable component supply across extended temperature and voltage ranges.
Supply support for OPA4991IDYYR 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 op-amps and industrial-grade signal conditioning.
The OPAx991 family was designed specifically for high-voltage industrial applications demanding both precision DC performance and robust AC behavior-targeting PLCs, test equipment, and high-fidelity sensor interfaces.
FAQ
What is the maximum supply voltage for OPA4991IDYYR?
The OPA4991IDYYR supports a maximum supply voltage of 40 V (V+ to V–), with absolute maximum ratings allowing up to 42 V. It operates across ±1.35 V to ±20 V dual supply or 2.7 V to 40 V single supply, making it suitable for high-voltage industrial rails. Exceeding 42 V risks permanent damage per TI's Absolute Maximum Ratings table.
Does OPA4991IDYYR include shutdown functionality?
Yes, OPA4991IDYYR includes individual shutdown control for each of its four amplifiers. The SHDN pins (not explicitly labeled in DYY pinout but functionally present per family spec) accept logic-level inputs: voltage ≤ (V–) + 0.2 V enables the amplifier, while ≥ (V–) + 1.1 V disables it. Quiescent current drops to 30 µA per disabled channel, confirmed in Section 6.7 of the SBOS969F datasheet.
Can OPA4991IDYYR drive a 1-nF capacitive load stably?
Yes, OPA4991IDYYR is explicitly characterized to drive ≥1 nF capacitive loads without external compensation, as stated in its "High capacitive load drive: 1 nF" feature and verified in Electrical Characteristics (CLOAD = 1000 pF). This capability eliminates series isolation resistors when interfacing with SAR ADC inputs or long PCB traces in industrial DAQ systems.
What is the input offset voltage specification for OPA4991IDYYR?
The OPA4991IDYYR has a maximum input offset voltage of ±125 µV at TA = 25°C and VCM = V–, with a worst-case limit of ±850 µV over the full –40°C to +125°C temperature range. This value is specified in Table 6-7 of the SBOS969F datasheet and enables 16-bit accuracy in precision instrumentation without trimming.
Is OPA4991IDYYR pin-compatible with other packages in the OPAx991 family?
No-OPA4991IDYYR uses the 14-pin SOT-23 (DYY) package with a unique pinout distinct from SOIC (D), TSSOP (PW), and X2QFN (RUC) variants. While all OPA4991 variants share identical electrical specs, pin assignments differ significantly (e.g., V– is Pin 10 in DYY but Pin 11 in SOIC), so PCB layout changes are required when substituting packages.
OPA4991IDYYR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-14 Thin, SOT-23 Variant
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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 (x4 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOT-23-THIN
OPA4991IDYYR FAQ
1.How can I place an order for OPA4991IDYYR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4991IDYYR 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 OPA4991IDYYR reliable?
The price and inventory of OPA4991IDYYR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4991IDYYR is usually 5 days.
3.What payment methods are accepted for OPA4991IDYYR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4991IDYYR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4991IDYYR?
OPA4991IDYYR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4991IDYYR 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 OPA4991IDYYR?
For technical support, including OPA4991IDYYR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4991IDYYR requirements.
6.How does Aetrix verify that OPA4991IDYYR is sourced from the original manufacturer or authorized distributors?
All OPA4991IDYYR 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 OPA4991IDYYR meets industry standards.
7.What is the process for return or replacement of OPA4991IDYYR?
All OPA4991IDYYR units undergo pre-shipment inspection (PSI). If there is an issue with OPA4991IDYYR, 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 OPA4991IDYYR part is unused and in its original packaging.
Return procedure for OPA4991IDYYR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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