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Analog Devices Inc. OP491GPZ
- Part No.:
- OP491GPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
OP491GPZ.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:197
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Product details
Overview
OP491GPZ from Analog Devices is a quad micropower, single-supply operational amplifier with rail-to-rail input and output capability, 3 MHz gain bandwidth, 0.5 V/μs slew rate, and 700 μV max offset voltage over –40°C to +125°C. It operates from 2.7 V to 12 V supply and delivers rail-to-rail swing into 2 kΩ loads - ideal for low-voltage strain gage amplifiers and DAC output buffering in battery-powered instrumentation.
For engineers reviewing the OP491GPZ datasheet, OP491GPZ pinout, OP491GPZ application, or OP491GPZ equivalent, key selection criteria include its guaranteed rail-to-rail operation at 3 V, 300 μA/amp quiescent current, input voltage range extending 10 V beyond either rail, absence of phase reversal, and extended temperature grade suitability for industrial process control and remote sensor interfaces.
Technical Context
The OP491GPZ employs a dual-input-stage architecture (PNP/NPN) that automatically switches based on common-mode voltage to maintain linear operation across the full rail-to-rail input range - enabling safe operation with inputs up to (VS + 10 V) and down to GND. Its output stage uses collector-connected PNP/NPN transistors to achieve millivolt-level saturation, delivering VOH ≥ 2.90 V and VOL ≤ 130 mV at 3 V with 2 kΩ load.
Designed for single-supply systems, it maintains 70 dB CMRR and 80 dB PSRR across 2.7–12 V supply range, supports multistage filter design without level-shifting, and exhibits no phase reversal under overdrive - critical for high-side current monitors and cold-junction compensated thermocouple amplifiers operating at 3 V.
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 12 V industrial rails without regulation. |
| Gain Bandwidth Product | 3 MHz - supports stable unity-gain buffer and 2nd-order active filters up to ~300 kHz. |
| Slew Rate | 0.5 V/μs - sufficient for 12-bit DAC settling (≤22 μs to 0.01%) and 50/60 Hz notch filter implementation. |
| Input Offset Voltage | 700 μV max (–40°C to +125°C) - ensures <0.1% error in 100 mV full-scale RTD or strain gage bridges. |
| Quiescent Current per Amp | 330–480 μA (–40°C to +125°C) - allows four-channel operation at <2 mA total, extending battery life in portable sensors. |
| Rail-to-Rail Input/Output | Input: 0 V to VS; Output: within 130 mV of rails at 2 kΩ - eliminates need for external biasing in single-supply signal chains. |
| Input Overvoltage Tolerance | GND to (VS + 10 V) - protects against transient coupling in power supply control and protection circuits. |
Pinout & Package
OP491GPZ is supplied in a 14-lead narrow-body SOIC (R package), measuring 8.65 mm × 3.90 mm × 1.75 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives low-impedance loads directly; rail-to-rail swing supports DAC buffer applications. |
| 2 | –INA | Inverting input of Amp A - accepts signals down to GND; internal 5 kΩ series resistor limits fault current. |
| 3 | +INA | Non-inverting input of Amp A - same overvoltage protection as –INA; enables true rail-to-rail common-mode range. |
| 4 | +V | Positive supply - connects to main system rail; decoupling capacitor required near pin for stability. |
| 5 | +INB | Non-inverting input of Amp B - electrically isolated from other amps; supports independent sensor channels. |
| 6 | –INB | Inverting input of Amp B - matched bias current to +INB; enables precision differential sensing. |
| 7 | OUTB | Amplifier B output - identical performance to OUTA; channel separation >145 dB @ 1 kHz prevents crosstalk. |
| 8 | OUTC | Amplifier C output - fully independent; allows 3-stage filtering or multi-sensor conditioning in one package. |
| 9 | –INC | Inverting input of Amp C - shares same input stage topology and overvoltage behavior as Pins 2 and 6. |
| 10 | +INC | Non-inverting input of Amp C - supports high-impedance sensor interfaces (e.g., piezoelectric transducers). |
| 11 | –V | Negative supply / ground - referenced to system GND in single-supply mode; must be low-impedance. |
| 12 | +IND | Non-inverting input of Amp D - enables fourth independent analog channel without board area penalty. |
| 13 | –IND | Inverting input of Amp D - matched to +IND; supports precision current-sense amplifier configurations. |
| 14 | OUTD | Amplifier D output - completes quad functionality; all four outputs specified for rail-to-rail swing at temperature. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Guaranteed under input overdrive - eliminates latch-up risk in comparator-mode or open-loop sensor interfaces. |
| Rail-to-rail input stage | Operates with common-mode voltage from GND to VS, enabling direct connection to resistive sensors and thermocouples. |
| Input overvoltage tolerance | Withstands –0.3 V to (VS + 10 V) - simplifies front-end protection in power supply monitoring circuits. |
| Low 1/f noise | 2 μV p-p (0.1–10 Hz) - preserves signal integrity in low-frequency strain gage and RTD measurements. |
| Extended temperature grade | Specified from –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom equipment. |
Applications
| Battery-Powered Instrumentation | Power Supply Control and Protection |
|---|---|
Use Scenario: Portable multimeter front-end conditioning 100 mV thermocouple outputs and 10 mV strain gage bridges. IC Role / Device Role / Timing Role: Quad op amp provides simultaneous low-noise amplification, reference buffering, and DAC output drive. Use Value: 300 μA/amp quiescent current enables >100-hour runtime on two AA cells; rail-to-rail I/O avoids level-shifting components. |
Use Scenario: Monitoring 12 V DC bus voltage and current in telecom power shelf with overvoltage/overcurrent shutdown logic. IC Role / Device Role / Timing Role: Configured as comparator (Amp A), error amplifier (Amp B), current sense buffer (Amp C), and reference follower (Amp D). Use Value: Input tolerance to (VS + 10 V) eliminates external clamping diodes; 125°C rating supports operation near hot power MOSFETs. |
| Remote Sensors | DAC Output Amplifiers |
Use Scenario: 4–20 mA loop-powered sensor node with Hall effect position detection and ambient temperature compensation. IC Role / Device Role / Timing Role: Amplifies Hall sensor output (rail-to-rail), conditions PT100 RTD bridge, buffers 2.5 V reference, and drives loop transmitter. Use Value: Single 3.3 V supply powers all four functions; 700 μV offset ensures <0.5°C error in RTD measurement at 125°C. |
Use Scenario: Driving 0–5 V analog outputs from 12-bit DAC in industrial PLC analog output module. IC Role / Device Role / Timing Role: Unity-gain buffer isolating DAC core from cable capacitance and field wiring impedance. Use Value: Rail-to-rail output swing guarantees full 0–5 V range; 0.5 V/μs slew rate settles 12-bit steps in <22 μs with 0.01% accuracy. |
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 | Lower 220 μA/amp supply current but only 600 kHz GBW and 0.15 V/μs slew rate; not rated above 85°C. | Not suitable for 125°C industrial environments or 3 MHz filter stages; limited for fast DAC buffering. | Select TLV2464IDR only for cost-sensitive, lower-bandwidth, commercial-temperature applications. |
| AD8604ARUZ | Higher 500 μA/amp supply current, 8 MHz GBW, 5 V/μs slew rate, and 60 μV max offset - but only rated –40°C to +125°C with tighter VS = 2.7–5.5 V range. | Superior precision and speed, but incompatible with 12 V single-supply systems or 3 V battery operation below 2.7 V. | Choose AD8604ARUZ when high-speed, low-offset performance is critical and supply is strictly 3–5 V. |
Compared with TLV2464IDR and AD8604ARUZ, OP491GPZ uniquely balances micropower operation (≤480 μA/amp), 3 MHz bandwidth, rail-to-rail I/O, and full industrial temperature range at 12 V compatibility - making it the only option supporting 3 V battery-powered instrumentation *and* 12 V industrial power monitoring in one device.
Availability
OP491GPZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial process control, and remote sensor systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OP491GPZ 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 Wilmington, MA.
The OPx91 family - including OP491GPZ - was designed specifically for micropower, single-supply signal conditioning in harsh industrial and portable environments where rail-to-rail operation, wide supply range, and extended temperature reliability are mandatory.
FAQ
What is the maximum supply voltage for OP491GPZ?
The absolute maximum supply voltage for OP491GPZ is 16 V, but the recommended operating range is 2.7 V to 12 V. Operation at 12 V is fully characterized across –40°C to +125°C, supporting industrial power rail applications. Exceeding 16 V risks permanent damage per Absolute Maximum Ratings.
Does OP491GPZ support true rail-to-rail input with a 3 V supply?
Yes, OP491GPZ guarantees rail-to-rail input operation from 0 V to 3 V with a 3 V supply. Its unique dual-input-stage architecture (PNP/NPN) ensures linear behavior across the full range, including at the negative rail - confirmed by Figure 12 and Table 1 input voltage range specification.
Can OP491GPZ drive a 2 kΩ load while maintaining rail-to-rail output swing at 125°C?
Yes. At –40°C to +125°C and 3 V supply, OP491GPZ delivers VOH ≥ 2.70 V and VOL ≤ 130 mV into a 2 kΩ load - verified in Table 1's Output Voltage High/Low specifications. This enables direct interface with ADCs and analog switches without level-shifting.
Is OP491GPZ pin-compatible with other quad op amps like LM324 or MCP6004?
No. OP491GPZ uses a proprietary 14-pin SOIC pinout optimized for quad rail-to-rail operation (e.g., Pin 4 = +V, Pin 11 = –V), differing from LM324's 14-pin DIP/SOIC (Pin 4 = V–, Pin 11 = V+) and MCP6004's 14-pin TSSOP (Pin 3 = V+, Pin 12 = V–). PCB layout must follow OP491GPZ-specific footprint.
What is the typical input bias current of OP491GPZ at 25°C and 3 V supply?
The typical input bias current of OP491GPZ is 30 nA at 25°C and 3 V supply, with a maximum of 95 nA across –40°C to +125°C (Table 1). This low bias current minimizes voltage errors in high-impedance sensor interfaces such as piezoelectric transducers and pH electrodes.
OP491GPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 14-PDIP
OP491GPZ FAQ
1.How can I place an order for OP491GPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for OP491GPZ 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 OP491GPZ reliable?
The price and inventory of OP491GPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP491GPZ is usually 5 days.
3.What payment methods are accepted for OP491GPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP491GPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP491GPZ?
OP491GPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP491GPZ 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 OP491GPZ?
For technical support, including OP491GPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP491GPZ requirements.
6.How does Aetrix verify that OP491GPZ is sourced from the original manufacturer or authorized distributors?
All OP491GPZ 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 OP491GPZ meets industry standards.
7.What is the process for return or replacement of OP491GPZ?
All OP491GPZ units undergo pre-shipment inspection (PSI). If there is an issue with OP491GPZ, 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 OP491GPZ part is unused and in its original packaging.
Return procedure for OP491GPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OP491GPZ Tags
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