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Analog Devices Inc. OP191GSZ
- Part No.:
- OP191GSZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OP191GSZ.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:833
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Product details
Overview
OP191GSZ from Analog Devices is a micropower, single-supply rail-to-rail input/output operational amplifier in an 8-lead SOIC package. It operates from 2.7 V to 12 V, delivers 3 MHz gain bandwidth, 0.5 V/μs slew rate, and draws only 300 μA per amplifier. It enables precision signal conditioning in battery-powered instrumentation and low-voltage sensor interfaces where input/output swing to the rails is critical.
For engineers reviewing the OP191GSZ datasheet, OP191GSZ pinout, OP191GSZ application, or OP191GSZ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative op amps with documented functional trade-offs.
Technical Context
The OP191GSZ uses a dual-input-stage architecture-switching between PNP and NPN differential pairs-to achieve true rail-to-rail input operation across the full supply range (GND to VS), including 10 V beyond either rail without phase reversal or latch-up. Its output stage employs collector-connected PNP/NPN transistors to deliver millivolt-level output swing to both rails under load.
This architecture supports stable multistage filtering in single-supply systems and maintains high signal-to-noise ratio in low-voltage applications such as RTD amplifiers and DAC output buffers. The device is specified over –40°C to +125°C and fabricated on Analog Devices' CBCMOS process for robustness in industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 12 V - Enables direct use with 3 V Li-ion, 5 V USB, or 9–12 V industrial rails without regulation. |
| Gain Bandwidth Product | 3 MHz - Supports stable unity-gain buffer or gain-of-10 configurations up to ~300 kHz with adequate phase margin. |
| Slew Rate | 0.5 V/μs - Sufficient for 12-bit DAC output settling (e.g., 4.096 V full-scale) within <20 μs at 10× gain. |
| Input Offset Voltage | 700 μV max (–40°C to +125°C) - Limits DC error to ≤0.017% of 4.096 V full-scale, suitable for 12-bit accuracy. |
| Supply Current per Amplifier | 300 μA typical at 3 V - Enables >1-year battery life in coin-cell–powered remote sensors drawing <10 μA average system current. |
| Rail-to-Rail Output Swing | Within 10 mV of rails (RL = 100 kΩ) - Preserves dynamic range in 3 V systems where headroom is constrained. |
| Input Common-Mode Range | GND to VS - Accepts signals directly from resistive sensors (e.g., strain gages, thermistors) referenced to ground. |
Pinout & Package
OP191GSZ is housed in an 8-lead narrow-body SOIC (SOIC_N) package with standard JEDEC MS-012AC footprint (5.0 mm × 4.0 mm, 1.27 mm pitch). Pin 1 is marked with a dot or bevelled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | Internally unconnected; must remain floating - no routing or soldering required. |
| 2 | Inverting Input (–IN) | Differential input node; accepts signals up to VS + 10 V safely due to internal overvoltage protection. |
| 3 | Non-Inverting Input (+IN) | Differential input node; same overvoltage tolerance as Pin 2; used for reference or sensor inputs. |
| 4 | Negative Supply (GND) | Ground reference for single-supply operation; also serves as return path for input bias current. |
| 5 | No Connect | Internally unconnected; must remain floating - no PCB trace or via allowed. |
| 6 | Positive Supply (VS) | Primary power rail; supports 2.7–12 V; PSRR >80 dB ensures immunity to supply ripple. |
| 7 | Output (OUT) | Amplified output capable of sourcing/sinking ±8.75 mA; swings within 10 mV of VS and GND. |
| 8 | No Connect | Internally unconnected; must remain floating - no thermal pad or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 3 V supply in sensor front-ends and DAC buffers without level-shifting circuitry. |
| 300 μA supply current per amplifier | Reduces quiescent power to 0.9 mW at 3 V - critical for always-on IoT sensor nodes. |
| No phase reversal on overvoltage | Allows safe operation with inputs exceeding supply rails by up to 10 V - eliminates need for external clamping diodes. |
| Guaranteed operation from –40°C to +125°C | Validated for automotive under-hood, industrial motor control, and outdoor telecom equipment. |
| Input voltage range extends 10 V beyond supplies | Supports direct connection to transducers with wide common-mode excursions (e.g., Hall effect sensors). |
Applications
| Battery-Powered Instrumentation | Low-Voltage Strain Gage Amplifiers |
|---|---|
Use Scenario: Portable pH meters and handheld multimeters powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Precision DC-coupled signal conditioner for microvolt-level electrode outputs. Use Value: Rail-to-rail input captures full sensor range; 300 μA quiescent current extends battery life beyond 2 years. |
Use Scenario: Structural health monitoring in aerospace composites using quarter-bridge strain gages. IC Role / Device Role / Timing Role: Low-drift, low-noise instrumentation amplifier front-end with 5 kΩ series input protection. Use Value: Input overvoltage tolerance prevents damage during ESD events; 700 μV max offset ensures ≤0.017% measurement error at 12-bit resolution. |
| DAC Output Amplifiers | Power Supply Control and Protection |
Use Scenario: 12-bit DAC output buffering in programmable power supplies and LED drivers. IC Role / Device Role / Timing Role: Unity-gain buffer isolating DAC core from capacitive loads while preserving linearity. Use Value: Rail-to-rail output delivers full 0–4.096 V DAC range; 0.5 V/μs slew rate settles 12-bit steps in <10 μs. |
Use Scenario: Overvoltage/overcurrent monitor in 5 V and 12 V DC-DC converter feedback loops. IC Role / Device Role / Timing Role: Comparator-like sensing of output rail deviations with built-in hysteresis capability. Use Value: No phase reversal allows reliable fault detection even during transient overvoltage; 3 MHz bandwidth supports fast response to load dumps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail input/output op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8605ARTZ-REEL7 | Lower offset (65 μV typ), higher supply current (1 mA), 10 MHz GBW, same SOIC-8 package. | Better DC precision but higher power; unsuitable for ultra-low-power coin-cell designs. | Select AD8605 when offset drift and noise dominate over battery life; verify thermal dissipation at 1 mA. |
| TSV611ICT | Lower supply current (170 μA), narrower GBW (150 kHz), lower VOS (150 μV), same rail-to-rail I/O. | Insufficient bandwidth for DAC buffering above 10 kHz; better for slow-sensing only. | Choose TSV611 for sub-200 μA systems with <200 kHz signal bandwidth; avoid for active filters or fast DACs. |
Compared with OP191GSZ, AD8605 offers superior DC performance at 3.3× higher quiescent power, while TSV611 cuts current by 43% but sacrifices 95% of bandwidth - making OP191GSZ the balanced choice for 3–5 V battery-powered systems needing 3 MHz fidelity and rail-to-rail operation.
Availability
OP191GSZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, low-voltage strain gage amplifiers, and DAC output buffering requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OP191GSZ 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The OPx91 family-including OP191GSZ-is designed specifically for micropower, single-supply signal conditioning in harsh industrial and portable environments where rail-to-rail operation and input overvoltage resilience are mandatory.
FAQ
What is the maximum supply voltage for OP191GSZ?
The absolute maximum supply voltage for OP191GSZ is 16 V, but the recommended operating range is 2.7 V to 12 V. Operation above 12 V risks exceeding internal junction temperature limits and degrading long-term reliability. All electrical specifications in the datasheet are guaranteed only within the 2.7–12 V range, and the device's micropower architecture is optimized for efficiency below 12 V.
Does OP191GSZ support true rail-to-rail input with a 3 V supply?
Yes, OP191GSZ supports true rail-to-rail input operation from GND to VS (0 V to 3 V) with a 3 V supply. Its unique dual-input-stage architecture ensures linear behavior across the entire common-mode range, including at the rails. This is confirmed in Figure 9 and Table 1 of the Rev. E datasheet, where input voltage range is explicitly specified as 0 V to 3 V at VS = 3 V.
Can OP191GSZ drive a 2 kΩ load while maintaining rail-to-rail output swing?
Yes, OP191GSZ can drive a 2 kΩ load with rail-to-rail output swing: at VS = 3 V, VOH ≥ 2.70 V and VOL ≤ 130 mV (–40°C to +125°C), delivering usable swing within 300 mV of both rails. At VS = 5 V, VOH ≥ 4.65 V and VOL ≤ 155 mV. These values are measured under load and reflect actual design margin for buffered DAC or sensor outputs.
Is OP191GSZ pin-compatible with other op amps in the OPx91 family?
No, OP191GSZ is not pin-compatible with OP291 or OP491. While all three share the same 8-lead SOIC package footprint, OP191GSZ has NC pins at positions 1, 5, and 8, whereas OP291 uses all eight pins for dual-amplifier functionality. Substituting OP191GSZ for OP291 would leave critical pins (e.g., OUTB, –INB, +INB) unconnected and nonfunctional.
What is the input bias current drift of OP191GSZ over temperature?
The input bias current drift of OP191GSZ is specified as ∆IB/∆T = 100 pA/°C (max) over –40°C to +125°C. This value is consistent across all supply voltages (3 V, 5 V, ±5 V) and appears in Tables 1–3 of the Rev. E datasheet. At 25°C, typical IB is 30 nA; at +125°C, it rises to ≤125 nA - a manageable shift for high-impedance sensor interfaces.
OP191GSZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.5V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 nA
- Voltage - Input Offset:
- 80 µV
- Current - Supply:
- 260µA
- Current - Output / Channel:
- 16 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OP191GSZ FAQ
1.How can I place an order for OP191GSZ through Aetrix?
Please submit a Request for Quotation (RFQ) for OP191GSZ 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 OP191GSZ reliable?
The price and inventory of OP191GSZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP191GSZ is usually 5 days.
3.What payment methods are accepted for OP191GSZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP191GSZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP191GSZ?
OP191GSZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP191GSZ 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 OP191GSZ?
For technical support, including OP191GSZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP191GSZ requirements.
6.How does Aetrix verify that OP191GSZ is sourced from the original manufacturer or authorized distributors?
All OP191GSZ 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 OP191GSZ meets industry standards.
7.What is the process for return or replacement of OP191GSZ?
All OP191GSZ units undergo pre-shipment inspection (PSI). If there is an issue with OP191GSZ, 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 OP191GSZ part is unused and in its original packaging.
Return procedure for OP191GSZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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