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OPA2191IDR
Texas Instruments
IC CMOS 2 CIRCUIT 8SOIC
10450 Pcs New Original In Stock
CMOS Amplifier 2 Circuit Rail-to-Rail 8-SOIC
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5.0 / 5.0
- (106 Ratings)
OPA2191IDR
Product Overview
12800981
DiGi Electronics Part Number
OPA2191IDR-DGManufacturer
Texas Instruments
OPA2191IDR
Description
IC CMOS 2 CIRCUIT 8SOICInventory
10450 Pcs New Original In Stock
CMOS Amplifier 2 Circuit Rail-to-Rail 8-SOIC
Quantity
Minimum 1
Minimum 1
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OPA2191IDR Technical Specifications
Category
Linear, Amplifiers, Instrumentation, Op Amps, Buffer Amps
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
Product Status
Active
Amplifier Type
CMOS
Number of Circuits
2
Output Type
Rail-to-Rail
Slew Rate
7.5V/µs
Gain Bandwidth Product
2.5 MHz
Current - Input Bias
5 pA
Voltage - Input Offset
5 µV
Current - Supply
140µA (x2 Channels)
Current - Output / Channel
65 mA
Voltage - Supply Span (Min)
4.5 V
Voltage - Supply Span (Max)
36 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (0.154", 3.90mm Width)
Supplier Device Package
8-SOIC
Base Product Number
OPA2191
Datasheet & Documents
Manufacturer Product Page
OPA2191IDR Specifications
HTML Datasheet
OPA2191IDR-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
2 (1 Year)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.33.0001
Additional Information
Other Names
296-45467-6
296-45467-1
296-45467-2
Standard Package
2,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
送貨速度快，包裝也很仔細，產品耐用性非常出色，非常滿意。
December 02, 2025
Leur large gamme de produits avec un traitement efficace est la clé de notre réussite dans l’approvisionnement.
December 02, 2025
Their product variety means I never run out of new things to try.
December 02, 2025
Overall, DiGi Electronics excels in inventory management and post-sale customer support.
December 02, 2025
I appreciate the detailed product descriptions and easy-to-use filtering options that help me narrow down choices efficiently.
December 02, 2025
Excellent packaging prevented any damage during transit, demonstrating great attention to detail.
December 02, 2025
Their focus on quality and price makes them a standout brand.
December 02, 2025
The materials used are top-notch, reflecting a high standard of quality and reliability.
December 02, 2025
DiGi Electronics offers incredible value for money while maintaining high quality standards.
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Frequently Asked Questions (FAQ)
When replacing a legacy bipolar op-amp like the LM358 with the OPA2191IDR in a low-power sensor interface circuit, what critical design risks should I evaluate to avoid unexpected performance degradation?
Replacing the LM358 with the OPA2191IDR introduces several key considerations: while the OPA2191IDR offers superior precision (5 µV offset vs. 2–7 mV on LM358) and lower input bias current (5 pA vs. 20–200 nA), its CMOS input stage is more susceptible to latch-up and ESD damage in high-impedance sensor nodes. Additionally, the OPA2191IDR’s rail-to-rail output swing near the negative rail may not fully reach 0 V under light loads, unlike the LM358’s true ground-sensing output. Ensure your feedback network and load conditions don’t cause output saturation near rails, and add input protection diodes if interfacing with high-impedance sources. Also verify supply sequencing—unlike the LM358, the OPA2191IDR is not tolerant of input voltages beyond the supply rails, so transient overshoots must be clamped.
Can the OPA2191IDR safely drive a 100 pF capacitive load directly in a unity-gain buffer configuration without stability issues, and what mitigation strategies are recommended if oscillation occurs?
The OPA2191IDR is not optimized for direct driving of heavy capacitive loads (>50 pF) in unity-gain configurations and may exhibit peaking or oscillation with a 100 pF load due to phase margin degradation. While its internal compensation supports moderate capacitive loads, TI’s datasheet recommends isolating the load with a small series resistor (10–100 Ω) between the output and capacitor to dampen resonance. For critical applications, add a feedback capacitor (e.g., 1–10 pF) across the feedback resistor to improve phase margin. Always validate stability via transient simulation or bench testing with actual load capacitance, including PCB parasitics, as layout-induced inductance can exacerbate ringing.
How does the OPA2191IDR compare to the Analog Devices ADA4661-2 in high-temperature industrial environments, particularly regarding long-term drift and reliability at 125°C?
The OPA2191IDR and ADA4661-2 are both precision dual CMOS op-amps rated for -40°C to 125°C, but the OPA2191IDR has a lower initial offset voltage (5 µV vs. 25 µV) and better long-term stability due to TI’s advanced trimming process. However, the ADA4661-2 features higher open-loop gain (130 dB vs. 120 dB) and better PSRR (110 dB vs. 100 dB), making it more robust in noisy power environments. At sustained 125°C operation, the OPA2191IDR’s offset drift (0.3 µV/°C typical) remains excellent, but ensure proper thermal management—its 8-SOIC package has limited heat dissipation. For mission-critical systems, consider derating supply voltage and using guard rings to minimize leakage currents that can affect precision at high temperatures.
Is it safe to operate the OPA2191IDR with a single 5 V supply when interfacing with a 3.3 V microcontroller ADC, and how should I handle input overvoltage protection if the signal source can exceed 5 V?
Yes, the OPA2191IDR can operate on a single 5 V supply (within its 4.5 V to 36 V range), and its rail-to-rail output can swing close enough to ground (typically within 50 mV under light load) to interface safely with a 3.3 V ADC. However, if the input signal can exceed 5 V, you must protect the inputs—the OPA2191IDR has no internal overvoltage clamping. Use external Schottky diodes (e.g., BAT54S) from each input to V+ and GND to limit voltage excursions, and include a series resistor (1 kΩ to 10 kΩ) to limit diode current. Avoid relying on the internal ESD diodes, as they’re not rated for continuous overvoltage. This protects against damage while preserving the amplifier’s low bias current and precision.
What layout and grounding practices are essential when using the OPA2191IDR in a high-impedance photodiode transimpedance amplifier to prevent noise and leakage errors?
In high-impedance photodiode applications, the OPA2191IDR’s ultra-low input bias current (5 pA) is advantageous, but layout is critical to maintain performance. Use a guard ring connected to the inverting input (or virtual ground) around high-impedance traces to shunt surface leakage currents away from the photodiode node. Keep the feedback resistor physically close to the inverting input and minimize copper area on that node. Use a solid ground plane beneath the amplifier but avoid routing noisy digital signals under the op-amp. Power supply bypassing with a 100 nF ceramic capacitor placed within 2 mm of the supply pins is mandatory—add a 10 µF bulk capacitor if supply impedance is high. Also, ensure the photodiode’s cathode/anode connections are shielded or routed away from AC lines to prevent coupling, as even picoampere-level leakage can dominate the signal.
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OPA2191IDR CAD Models
Texas Instruments OPA2191IDR PCB symbols & footprints
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