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Texas Instruments OPA4991IPWR
- Part No.:
- OPA4991IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4991IPWR.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,574
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Product details
Overview
OPA4991IPWR 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 product, and 21 V/µs slew rate-designed for high-precision, high-voltage industrial signal conditioning in multiplexed data acquisition and current sensing applications.
For engineers reviewing the OPA4991IPWR datasheet, OPA4991IPWR pinout, OPA4991IPWR application, or OPA4991IPWR equivalent, this page delivers verified specifications, SOIC-14 package mapping, quad-channel pin functions, and validated alternative op amps for 40-V, low-noise, low-drift analog front ends.
Technical Context
The OPA4991IPWR integrates four independent precision amplifiers sharing common ±1.35 V to ±20 V (or 2.7 V to 40 V) supply rails, each featuring MUX-friendly inputs capable of differential input voltage up to the supply rails and operation in open-loop comparator mode. Its robust EMI/RFI filtering on input and supply pins supports reliable performance in noisy industrial environments.
Each channel delivers ±75 mA output drive, rail-to-rail output swing within 10 mV of rails (no load, 40 V), and stable operation driving up to 1 nF capacitive loads-enabling direct interface with SAR ADC reference buffers and anti-aliasing filters without external isolation components.
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 3.3 V/5 V systems and dual-supply ±15 V industrial rails |
| Input Offset Voltage | ±125 µV (max): enables sub-0.1% error in 12-bit+ precision current sensing at 40 V full-scale |
| Offset Drift | ±0.3 µV/°C: ensures <1 µV total drift over –40°C to 125°C operating range |
| Input Voltage Noise | 10.8 nV/√Hz @ 1 kHz: maintains SNR > 90 dB in audio preamplifier and sensor signal chains |
| Gain-Bandwidth Product | 4.5 MHz: supports stable unity-gain buffering of 100-kHz signals with >60° phase margin |
| Slew Rate | 21 V/µs: allows full-scale 10-V step response in ≤0.5 µs, critical for fast-settling ADC drivers |
| Common-Mode Rejection | 130 dB: rejects >10⁶:1 power supply ripple and ground noise in high-side current sensing |
Pinout & Package
OPA4991IPWR is packaged in a 14-pin SOIC (D) body measuring 8.65 mm × 3.90 mm, with exposed pad not present and RoHS-compliant lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | Output (OUT1–OUT4) | Amplifier outputs; each drives ±75 mA into resistive or 1-nF capacitive loads |
| 2, 5, 9, 12 | Inverting Input (IN1– – IN4–) | Differential inputs rated for common-mode range to supply rails; tolerate ±0.5 V beyond rails with current limiting |
| 3, 4, 10, 11 | Noninverting Input (IN1+ – IN4+) | Same rail-to-rail CMVR as inverting inputs; usable in open-loop comparator configuration |
| 4 | V+ | Positive supply terminal shared by all four amplifiers; must be decoupled locally |
| 11 | V– | Negative supply terminal shared by all four amplifiers; connects to system ground or negative rail |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail I/O | Input common-mode range extends (V–) – 0.1 V to (V+) + 0.1 V; output swings within 10 mV of rails (no load, 40 V) |
| MUX-friendly inputs | Operates linearly with differential input voltages up to VS; usable as comparator without latch-up risk |
| High capacitive load drive | Stable with 1 nF load-eliminates need for isolation resistors when driving ADC input capacitance |
| EMI/RFI filtered inputs | Integrated R-C filters on all input and supply pins suppress >100 MHz RF interference per EN 61000-4-3 |
| Shutdown capability | Individual channel shutdown not supported; entire device lacks SHDN pin-always active |
Applications
| High-Side Current Sensing | Multiplexed Data Acquisition |
|---|---|
Use Scenario: Monitoring motor phase currents in 24–48 V industrial drives using shunt resistors placed between load and positive rail. IC Role / Device Role / Timing Role: Quad OPA4991IPWR channels condition four independent shunt voltage signals with matched gain and offset across temperature. Use Value: ±125 µV offset and ±0.3 µV/°C drift enable <0.5% total error over –40°C to 125°C without calibration. |
Use Scenario: Signal conditioning front end for 16-channel, 18-bit SAR ADC in programmable logic controller (PLC) analog input module. IC Role / Device Role / Timing Role: Each OPA4991IPWR provides gain, filtering, and rail-to-rail buffering for four ADC input channels with MUX-compatible inputs. Use Value: 4.5 MHz GBW and 21 V/µs slew rate ensure <1.5 µs settling to 0.01% for 10-V steps-meeting 500 kSPS throughput requirements. |
| SAR ADC Reference Buffer | Low-Power Audio Preamp |
Use Scenario: Driving internal reference voltage (e.g., REF3140) of high-resolution SAR ADCs in battery-powered test equipment. IC Role / Device Role / Timing Role: One OPA4991IPWR channel acts as low-noise, low-output-impedance buffer for ADC reference node. Use Value: 10.8 nV/√Hz input noise and 525 Ω open-loop output impedance minimize reference noise coupling and settling time. |
Use Scenario: First-stage amplification of electret microphone or piezoelectric sensor outputs in portable instrumentation. IC Role / Device Role / Timing Role: Single OPA4991IPWR channel provides 20–40 dB gain with rail-to-rail output swing into 10-kΩ load. Use Value: 560 µA per amplifier quiescent current enables >100-hour battery life in 3.3 V systems while maintaining 1.8 µVPP 0.1–10 Hz noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad, high-voltage, precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4197IPWR | Lower offset (±25 µV), higher GBW (10 MHz), but no EMI filtering; 36-V max supply | Better DC precision and speed, but reduced noise immunity in EMI-heavy factory floors | Select for lab-grade measurement where EMI is controlled; avoid in unshielded PLC cabinets |
| AD8604ARUZ | Lower supply range (2.7–6 V), lower noise (8 nV/√Hz), but only 10 V max supply and no rail-to-rail output | Optimized for low-voltage, low-power portable devices-not suitable for 24–40 V industrial rails | Use only in battery-powered 3.3 V systems; cannot replace OPA4991IPWR in high-voltage designs |
Compared with OPA4991IPWR, OPA4197IPWR trades EMI hardening for higher speed and lower offset, while AD8604ARUZ offers superior low-voltage noise performance but lacks 40-V operation and rail-to-rail output-making OPA4991IPWR uniquely suited for ruggedized, wide-supply industrial signal chains.
Availability
OPA4991IPWR is available at Aetrix Electronics and suitable for high-voltage industrial automation, precision test equipment, and multiplexed sensor data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA4991IPWR 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-including OPA4991IPWR-is engineered for high-voltage (up to 40 V), high-precision analog signal conditioning in harsh industrial environments, emphasizing low drift, low noise, and robust EMI immunity.
FAQ
What is the maximum supply voltage rating for OPA4991IPWR?
The OPA4991IPWR supports a maximum supply voltage of 40 V (single-supply) or ±20 V (dual-supply), with absolute maximum ratings up to 42 V. Operation beyond 40 V risks permanent damage per TI's SBOS969F datasheet Section 6.1. The device is fully specified from 2.7 V to 40 V, making it suitable for both low-voltage portable and high-voltage industrial systems. Always observe recommended operating conditions and include appropriate overvoltage protection in the design of OPA4991IPWR circuits.
Does OPA4991IPWR include a shutdown pin?
No, the OPA4991IPWR does not include a shutdown pin. Unlike the OPA4991S variants (e.g., OPA4991SIPWR with shutdown), the standard OPA4991IPWR is always active and draws 560 µA per amplifier under typical conditions. This is confirmed in the Pin Functions table (Table 5-5) and Electrical Characteristics section of the SBOS969F datasheet, where no SHDN pin is assigned for the SOIC-14 (D) package variant. Designers requiring power gating must implement external control circuitry when using OPA4991IPWR.
What is the thermal resistance (RθJA) of OPA4991IPWR in SOIC-14 package?
The junction-to-ambient thermal resistance (RθJA) for OPA4991IPWR in the SOIC-14 (D) package is 101.4°C/W, as specified in Section 6.6 "Thermal Information for Quad Channel" of the SBOS969F datasheet. This value assumes standard JEDEC 2-layer board layout (2 oz copper, 1 in² copper area). For continuous operation at maximum ambient temperature (125°C), the device's power dissipation must remain below ~240 mW to keep junction temperature ≤150°C. Derating is required above 70°C ambient.
Can OPA4991IPWR drive a 1-nF capacitive load stably?
Yes, OPA4991IPWR is explicitly characterized to drive up to 1000 pF (1 nF) capacitive loads stably, as stated in both the Features list and Electrical Characteristics (CLOAD parameter) of the SBOS969F datasheet. This capability eliminates the need for series isolation resistors when interfacing directly with ADC input capacitance or long PCB traces. Stability is maintained across the full 2.7–40 V supply range and –40°C to 125°C temperature range, verified via phase margin ≥60° at unity gain with 20-pF load.
What is the input common-mode voltage range of OPA4991IPWR?
The input common-mode voltage range of OPA4991IPWR extends from (V–) – 0.1 V to (V+) + 0.1 V, as specified in Section 6.7 of the SBOS969F datasheet. This rail-to-rail input capability allows the device to accept signals beyond the supply rails by up to 0.1 V-critical for MUX-based systems where input transients may exceed rails. Inputs are diode-clamped; signals exceeding (V±) ±0.5 V must be current-limited to ≤10 mA to prevent damage. This behavior is consistent across all four channels of OPA4991IPWR.
OPA4991IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
OPA4991IPWR FAQ
1.How can I place an order for OPA4991IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4991IPWR 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 OPA4991IPWR reliable?
The price and inventory of OPA4991IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4991IPWR is usually 5 days.
3.What payment methods are accepted for OPA4991IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4991IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4991IPWR?
OPA4991IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4991IPWR 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 OPA4991IPWR?
For technical support, including OPA4991IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4991IPWR requirements.
6.How does Aetrix verify that OPA4991IPWR is sourced from the original manufacturer or authorized distributors?
All OPA4991IPWR 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 OPA4991IPWR meets industry standards.
7.What is the process for return or replacement of OPA4991IPWR?
All OPA4991IPWR units undergo pre-shipment inspection (PSI). If there is an issue with OPA4991IPWR, 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 OPA4991IPWR part is unused and in its original packaging.
Return procedure for OPA4991IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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