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Analog Devices Inc. OP491GRUZ-REEL
- Part No.:
- OP491GRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OP491GRUZ-REEL.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,065
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Product details
Overview
OP491GRUZ-REEL from Analog Devices is a quad micropower rail-to-rail input/output operational amplifier optimized for single-supply operation from 2.7 V to 12 V, delivering 3 MHz gain bandwidth, 0.5 V/μs slew rate, and 700 μV max offset voltage across –40°C to +125°C - enabling precision signal conditioning in battery-powered instrumentation and industrial sensor interfaces.
For engineers reviewing the OP491GRUZ-REEL datasheet, OP491GRUZ-REEL pinout, OP491GRUZ-REEL application, or OP491GRUZ-REEL equivalent, key selection criteria include guaranteed rail-to-rail I/O swing at 3 V supply, 300 μA/amp quiescent current, 14-pin TSSOP package compatibility, and extended temperature grade suitability for embedded control and remote sensing systems.
Technical Context
The OP491GRUZ-REEL employs a dual-input-stage architecture (PNP/NPN) that enables true rail-to-rail common-mode input range - extending 10 V beyond either supply without phase reversal or latch-up. Its output stage uses collector-connected PNP/NPN transistors to achieve millivolt-level saturation voltage, supporting rail-to-rail output swing into loads down to 2 kΩ.
It features inherent input overvoltage protection via 5 kΩ series resistors and differential clamping diodes, allowing safe operation with inputs up to GND–10 V or VS+10 V. Channel separation exceeds 145 dB at 1 kHz, minimizing crosstalk in multichannel signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 12 V single supply; supports ±5 V dual supply - enables direct integration into 3 V microcontroller systems and legacy 5 V industrial rails. |
| Gain Bandwidth Product | 3 MHz - sufficient for anti-aliasing filters, active sensor conditioning, and 12-bit DAC output buffering up to ~100 kHz closed-loop bandwidth. |
| Input Offset Voltage | 700 μV max (–40°C to +125°C) - ensures <0.1% error in 1 V full-scale low-side current sensing and RTD bridge amplification. |
| Quiescent Current per Amp | 330–480 μA (–40°C to +125°C) - enables >1-year battery life in coin-cell–powered wireless sensors with four active channels. |
| Rail-to-Rail Output Swing | Within 10 mV of supplies (RL = 100 kΩ); within 200 mV (RL = 2 kΩ) - preserves dynamic range in single-supply data acquisition with 12-bit ADCs. |
| Common-Mode Rejection | 65–87 dB (–40°C to +125°C) - maintains accuracy in noisy industrial environments with ground offsets up to 100 mV. |
| Channel Separation | 145 dB at 1 kHz - prevents inter-channel interference in quad-configured thermocouple or strain-gage front ends. |
Pinout & Package
OP491GRUZ-REEL is housed in a 14-lead TSSOP (RU) package with exposed pad, optimized for thermal performance (θJA = 180°C/W) and PCB space efficiency in compact sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives external load or feedback network; rail-to-rail swing supports direct interface to SAR ADC reference buffers. |
| 2 | –INA | Inverting input of Amp A - accepts differential signals from transducers; internal 5 kΩ series resistor limits fault current during overvoltage events. |
| 3 | +INA | Non-inverting input of Amp A - used for unity-gain buffers or high-impedance sensor interfaces; immune to phase reversal up to ±10 V beyond rails. |
| 4 | +V | Positive supply pin - shared by all four amplifiers; decoupling capacitor required within 1 cm for stable 3 MHz operation. |
| 5 | +INB | Non-inverting input of Amp B - enables independent channel configuration; matched bias current minimizes offset drift in parallel sensor channels. |
| 6 | –INB | Inverting input of Amp B - supports differential input stages with matched layout to Amp A for common-mode rejection. |
| 7 | OUTB | Amplifier B output - electrically isolated from OUTA; allows dual-path signal processing without crosstalk degradation. |
| 8 | OUTC | Amplifier C output - provides third independent output path; critical for three-wire RTD configurations requiring excitation and sense amplification. |
| 9 | –INC | Inverting input of Amp C - used for current-sense shunt amplification; low input bias current (≤95 nA) avoids loading high-value gain-setting resistors. |
| 10 | +INC | Non-inverting input of Amp C - referenced to precision voltage source; enables ratiometric measurement with 3 V supply-referenced ADCs. |
| 11 | –V | Negative supply pin (GND in single-supply mode) - return path for all four amplifiers; must be low-impedance plane to maintain PSRR >75 dB. |
| 12 | +IND | Non-inverting input of Amp D - configured as reference buffer or cold-junction compensator in thermocouple applications. |
| 13 | –IND | Inverting input of Amp D - used for summing or offset correction; supports programmable gain via external resistor networks. |
| 14 | OUTD | Amplifier D output - completes quad functionality; supports active filtering or level-shifting before analog-to-digital conversion. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Input voltage safely extends 10 V beyond either supply rail without output inversion - eliminates latch-up risk in open-loop comparator modes or transient overvoltage conditions. |
| Rail-to-rail input range | Operates with common-mode voltage from GND to VS, enabling direct connection to unbuffered resistive sensors (e.g., potentiometers, RTDs) without level-shifting circuitry. |
| Low power consumption | 300 μA/amp typical at 3 V - reduces self-heating in sealed enclosures and extends runtime in energy-harvesting nodes powered by solar or piezoelectric sources. |
| Extended temperature grade | Specified from –40°C to +125°C - qualified for under-hood automotive sensors, industrial motor controllers, and outdoor telecom equipment. |
| High channel separation | 145 dB at 1 kHz - ensures minimal signal coupling between independently configured amplifiers in quad-based analog front ends. |
Applications
| Battery-Powered Instrumentation | Industrial Process Control |
|---|---|
|
Use Scenario: Portable pH meter with 3 V coin-cell supply and 12-bit ADC. IC Role / Device Role / Timing Role: Quad op amp configures two channels for electrode signal conditioning, one for reference buffer, and one for temperature compensation. Use Value: Rail-to-rail I/O preserves full 0–3 V ADC range; 300 μA/amp current draw enables >2-year battery life with 200 μA average system load. |
Use Scenario: 4–20 mA loop transmitter with HART modulation in factory automation. IC Role / Device Role / Timing Role: Amplifier A buffers RTD sensor, B drives current loop, C conditions auxiliary temperature input, D isolates HART signal path. Use Value: 125°C rating ensures reliability in hot control cabinets; 145 dB channel separation prevents HART signal corruption by loop current noise. |
| Power Supply Control & Protection | Remote Sensors |
|
Use Scenario: Overvoltage/overcurrent protection circuit in 5 V DC-DC converter module. IC Role / Device Role / Timing Role: Amp A monitors output voltage, B senses shunt current, C compares against thresholds, D drives shutdown FET gate. Use Value: Input overvoltage tolerance (GND–10 V / VS+10 V) protects against transient surges; 700 μV offset ensures accurate 5.05 V trip point setting. |
Use Scenario: Wireless soil moisture node using capacitive sensor and LoRaWAN radio. IC Role / Device Role / Timing Role: All four amps condition sensor outputs, drive ADC inputs, buffer reference voltages, and manage wake-up timing signals. Use Value: Micropower operation (330 μA/amp) aligns with ultra-low-duty-cycle sleep modes; TSSOP package fits 12 mm × 12 mm PCB footprint constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2464IDR | Higher supply current (550 μA/amp), lower GBW (6.4 MHz), no input overvoltage tolerance beyond rails | Better AC performance but unsuitable for overvoltage-prone industrial sensor nodes | Select when higher bandwidth is prioritized over micropower and robustness |
| AD8604ARUZ | Lower offset (60 μV typ), higher supply current (800 μA/amp), narrower supply range (2.7–5.5 V) | Superior DC precision but limited to 5 V systems; lacks extended temp grade | Select for high-accuracy medical or test equipment where 125°C operation is unnecessary |
Compared with TLV2464IDR and AD8604ARUZ, OP491GRUZ-REEL uniquely balances micropower operation, extended temperature range, and ±10 V input overvoltage tolerance - making it the only option qualified for harsh-environment battery-powered sensors requiring long-term stability and fault resilience.
Availability
OP491GRUZ-REEL is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial process control, and remote sensor applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OP491GRUZ-REEL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and consumer markets since 1965.
The OPx91 family was engineered specifically for single-supply, low-power precision signal conditioning in portable and embedded systems - emphasizing rail-to-rail operation, wide input voltage tolerance, and extended temperature reliability.
FAQ
What supply voltage range does the OP491GRUZ-REEL support?
The OP491GRUZ-REEL operates from a single supply of 2.7 V to 12 V, and is also fully specified for ±5 V dual-supply operation. This flexibility allows direct use in 3 V microcontroller systems, 5 V industrial rails, and legacy ±5 V test equipment - with guaranteed rail-to-rail input/output performance across the entire range.
Does the OP491GRUZ-REEL have input overvoltage protection?
Yes - the OP491GRUZ-REEL includes built-in input overvoltage protection via 5 kΩ series resistors and differential clamping diodes on each input. It safely withstands input voltages from GND–10 V to VS+10 V without phase reversal or damage, a critical feature for sensor interfaces exposed to ESD or wiring faults.
What is the maximum operating temperature for the OP491GRUZ-REEL?
The OP491GRUZ-REEL is rated for continuous operation from –40°C to +125°C, meeting extended industrial temperature requirements. This specification is validated across all electrical parameters in the datasheet, including offset voltage, CMRR, and output swing - ensuring reliability in under-hood automotive, factory floor, and outdoor deployments.
Can the OP491GRUZ-REEL drive a 2 kΩ load rail-to-rail?
Yes - the OP491GRUZ-REEL delivers rail-to-rail output swing into 2 kΩ loads: VOL ≤ 200 mV above GND and VOH ≥ VS–200 mV at room temperature. At –40°C to +125°C, output swing degrades to within 250–300 mV of the rails, maintaining usable dynamic range for 12-bit ADC interfacing in demanding environments.
Is the OP491GRUZ-REEL pin-compatible with other quad op amps in TSSOP-14?
No - the OP491GRUZ-REEL has a unique pinout optimized for quad independence and noise isolation (e.g., dedicated +V and –V pins, interleaved inputs/outputs). It is not pin-compatible with standard TSSOP-14 quad op amps like the LM324 or TLV2464. PCB layout must follow the specific 14-pin assignment shown in Figure 5 of the OP491 datasheet Rev. E.
OP491GRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- 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:
- 0.5V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 nA
- Voltage - Input Offset:
- 80 µV
- Current - Supply:
- 260µA (x4 Channels)
- 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:
- 14-TSSOP
OP491GRUZ-REEL FAQ
1.How can I place an order for OP491GRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for OP491GRUZ-REEL 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 OP491GRUZ-REEL reliable?
The price and inventory of OP491GRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP491GRUZ-REEL is usually 5 days.
3.What payment methods are accepted for OP491GRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP491GRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP491GRUZ-REEL?
OP491GRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP491GRUZ-REEL 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 OP491GRUZ-REEL?
For technical support, including OP491GRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP491GRUZ-REEL requirements.
6.How does Aetrix verify that OP491GRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All OP491GRUZ-REEL 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 OP491GRUZ-REEL meets industry standards.
7.What is the process for return or replacement of OP491GRUZ-REEL?
All OP491GRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with OP491GRUZ-REEL, 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 OP491GRUZ-REEL part is unused and in its original packaging.
Return procedure for OP491GRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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