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Analog Devices Inc. OP491GSZ-REEL7
- Part No.:
- OP491GSZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OP491GSZ-REEL7.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:873
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Product details
Overview
OP491GSZ-REEL7 from Analog Devices is a quad micropower operational amplifier optimized for single-supply, rail-to-rail input/output operation across 2.7 V to 12 V. It delivers 3 MHz gain bandwidth, 0.5 V/μs slew rate, and 700 μV max offset voltage over –40°C to +125°C, enabling precision signal conditioning in battery-powered instrumentation and industrial sensor interfaces.
For engineers reviewing the OP491GSZ-REEL7 datasheet, OP491GSZ-REEL7 pinout, OP491GSZ-REEL7 application, or OP491GSZ-REEL7 equivalent, this page provides verified electrical specifications, package mapping to 14-lead SOIC (R), confirmed quad-channel rail-to-rail behavior, thermal performance data, and real-world design guidance for low-voltage transducer amplification and DAC output buffering.
Technical Context
The OP491GSZ-REEL7 employs a dual-input-stage architecture-PNP and NPN differential pairs-that automatically switches based on input common-mode voltage to maintain linearity across the full 0 V to VS range. Its output stage uses collector-connected PNP/NPN transistors to achieve millivolt-level rail-to-rail swing under 2 kΩ load.
It features 5 kΩ series input resistors and integrated differential diodes for ±7 V differential input protection, with guaranteed no phase reversal even when inputs exceed supply rails by up to 10 V. Channel separation exceeds 145 dB at 1 kHz, supporting multichannel precision systems without crosstalk degradation.
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 and 5 V embedded systems without level-shifting. |
| Gain Bandwidth Product | 3 MHz - allows stable unity-gain buffer configurations and 2nd-order active filters up to ~480 kHz with adequate phase margin. |
| Input Offset Voltage | 700 μV max (–40°C to +125°C) - ensures ≤0.014% error in 5 V full-scale measurements without trimming. |
| Rail-to-Rail Output Swing | Within 10 mV of rails at 100 kΩ load; within 200 mV at 2 kΩ - preserves dynamic range in low-voltage ADC driver stages. |
| Supply Current per Amplifier | 330–480 μA (–40°C to +125°C) - enables four-channel analog front-end operation below 2 mA total quiescent current. |
| Common-Mode Rejection Ratio | 65–87 dB (–40°C to +125°C) - maintains accuracy in noisy industrial environments with ground offsets up to 200 mV. |
| Input Voltage Range | 0 V to VS (single supply); –5 V to +5 V (±5 V supply) - accepts signals directly from resistive sensors, thermocouples, and RTDs without external biasing. |
Pinout & Package
OP491GSZ-REEL7 is packaged in a 14-lead narrow-body SOIC (R) with standard JEDEC MS-012AC footprint (5.0 mm × 4.4 mm, 1.27 mm pitch). Thermal resistance θJA = 120°C/W, θJC = 36°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTA | Amplifier A output - drives loads down to 2 kΩ while maintaining rail-to-rail swing and <10 mV saturation voltage. |
| 2 | –INA | Inverting input of Amp A - protected by 5 kΩ series resistor and clamp diodes; tolerates 10 V beyond either supply rail. |
| 3 | +INA | Non-inverting input of Amp A - same ESD and overvoltage protection as –INA; supports true rail-to-rail common-mode range. |
| 4 | +V | Positive supply pin - shared by all four amplifiers; decoupling capacitor required within 1 cm for stability. |
| 5 | +INB | Non-inverting input of Amp B - electrically isolated from other channels; enables independent biasing per channel. |
| 6 | –INB | Inverting input of Amp B - identical protection and CMVR to +INB; supports differential input configurations. |
| 7 | OUTB | Amplifier B output - fully independent output stage; no crosstalk with OUTA/C/D (145 dB channel separation). |
| 8 | OUTC | Amplifier C output - matches OUTA/B performance; usable for multi-stage filtering or parallel gain boosting. |
| 9 | –INC | Inverting input of Amp C - validated for continuous operation at VS and GND; no phase reversal observed. |
| 10 | +INC | Non-inverting input of Amp C - supports high-impedance sensor interfaces (e.g., piezoelectric transducers). |
| 11 | –V | Negative supply / ground pin - return path for all four amplifiers; requires low-impedance connection to system ground plane. |
| 12 | +IND | Non-inverting input of Amp D - enables fourth independent channel for reference buffering or fault monitoring. |
| 13 | –IND | Inverting input of Amp D - supports unity-gain inverter or transimpedance configuration with photodiode inputs. |
| 14 | OUTD | Amplifier D output - fully specified for rail-to-rail swing and 3 MHz bandwidth; usable as precision voltage reference follower. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on overdrive | Guaranteed operation without output polarity inversion when inputs exceed supply rails by up to 10 V - eliminates latch-up risk in comparator-mode use. |
| Rail-to-rail input and output | Accepts common-mode signals from GND to VS; delivers output within 10 mV of either rail - maximizes signal headroom in 3 V systems. |
| Micropower consumption | 330–480 μA per amplifier over full temperature range - enables four-channel analog signal chain with <2 mA total IQ. |
| Extended temperature range | Specified from –40°C to +125°C - qualified for under-hood automotive, industrial PLC, and downhole sensor applications. |
| High channel separation | 145 dB at 1 kHz - prevents inter-channel interference in multichannel data acquisition and sensor fusion systems. |
| Input overvoltage protection | 5 kΩ series resistors + clamp diodes limit fault current to safe levels during ±7 V differential transients - reduces need for external protection. |
Applications
| Battery-Powered Instrumentation | Industrial Process Control |
|---|---|
Use Scenario: Portable pH meter with 3 V coin-cell supply and microamp-level electrode current. IC Role / Device Role / Timing Role: Quad amplifier configures two channels as low-noise transimpedance amplifiers for pH electrode, one as reference buffer, and one as rail-to-rail output driver to 12-bit SAR ADC. Use Value: 330 μA per channel enables >100-hour battery life; rail-to-rail input captures full 0–14 pH range without external biasing. |
Use Scenario: 4–20 mA loop-powered transmitter with HART modulation capability. IC Role / Device Role / Timing Role: One OP491GSZ-REEL7 channel conditions RTD bridge output, another buffers 2.5 V reference, third drives DAC output, fourth isolates HART FSK signal. Use Value: Guaranteed –40°C to +125°C operation ensures reliability in field-mounted enclosures; 700 μV offset minimizes calibration drift over temperature. |
| Power Supply Control and Protection | DAC Output Amplification |
Use Scenario: Overvoltage/overcurrent protection circuit in 5 V DC-DC converter with fast shutdown response. IC Role / Device Role / Timing Role: Two channels monitor input/output voltages via resistive dividers; third compares against reference; fourth drives MOSFET gate with rail-to-rail swing. Use Value: 0.5 V/μs slew rate enables <5 μs response to fault conditions; no phase reversal prevents false triggering during transient overvoltage events. |
Use Scenario: Precision 16-bit DAC (e.g., AD5689) driving variable gain amplifier in test equipment. IC Role / Device Role / Timing Role: Single channel configured as unity-gain buffer between DAC output and downstream analog circuitry. Use Value: 700 μV max offset contributes <0.01% FSR error; rail-to-rail output ensures full 0–5 V DAC range is preserved without clipping. |
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), wider offset range (2.5 mV max), –40°C to +125°C rated. | Less suitable for ultra-low-power designs; better for higher-speed filtering where bandwidth >3 MHz is required. | Select TLV2464IDR only if >3 MHz bandwidth is needed and power budget allows ≥2.2 mA total quiescent current. |
| AD8604ARUZ | Lower offset (650 μV max), lower noise (12 nV/√Hz), higher supply current (1 mA/amp), same 3 MHz GBW, –40°C to +125°C. | Better for low-noise sensor front-ends but consumes >2× more current; TSSOP-14 package differs from SOIC-14 pinout. | Choose AD8604ARUZ when voltage noise is critical and PCB layout accommodates TSSOP-14; avoid if SOIC-14 footprint is fixed. |
Compared with TLV2464IDR and AD8604ARUZ, OP491GSZ-REEL7 offers the lowest quiescent current among quad rail-to-rail op amps rated for –40°C to +125°C, making it optimal for battery longevity and thermal-constrained industrial modules where 3 MHz bandwidth suffices.
Availability
OP491GSZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial process control, and power supply control and protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OP491GSZ-REEL7 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, with design centers worldwide.
The OPx91 family-including OP491GSZ-REEL7-is engineered for micropower, single-supply precision signal conditioning in harsh environments, targeting portable medical devices, industrial sensors, and energy-efficient automation systems.
FAQ
What is the maximum operating supply voltage for OP491GSZ-REEL7?
The absolute maximum supply voltage for OP491GSZ-REEL7 is 16 V, but the recommended operating range is 2.7 V to 12 V for single-supply use. Operation at 12 V is fully characterized per datasheet Rev. E, with parameters including 3 MHz GBW, 0.5 V/μs slew rate, and 700 μV max offset maintained across –40°C to +125°C. Exceeding 12 V risks parametric shift and reduced reliability.
Does OP491GSZ-REEL7 support true rail-to-rail input with a 3 V supply?
Yes, OP491GSZ-REEL7 supports true rail-to-rail input common-mode range from 0 V to 3 V when powered from a 3 V single supply. This is achieved via its dual-input-stage architecture (PNP/NPN), which guarantees linear operation and no phase reversal across the full range - confirmed in Figure 9 and Table 1 of the datasheet under VS = 3 V conditions.
Can OP491GSZ-REEL7 drive a 2 kΩ load while maintaining rail-to-rail output swing?
Yes, OP491GSZ-REEL7 delivers rail-to-rail output swing into a 2 kΩ load: VOH ≥ 2.70 V and VOL ≤ 130 mV at VS = 3 V and –40°C to +125°C (Table 1). At room temperature, typical performance is VOH = 2.9 V and VOL = 40–75 mV, enabling direct interfacing with low-impedance ADC inputs and analog switches without external buffers.
Is OP491GSZ-REEL7 qualified for automotive applications?
OP491GSZ-REEL7 is not AEC-Q200 qualified, but it is specified and tested over –40°C to +125°C, matching the temperature range required for many under-hood and cabin automotive subsystems. Its robust input overvoltage tolerance (up to VS +10 V), no-phase-reversal behavior, and SOIC-14 package make it suitable for non-safety-critical automotive applications like HVAC sensor conditioning or body control module analog front-ends - subject to customer qualification.
How does the input bias current of OP491GSZ-REEL7 behave near the supply rails?
OP491GSZ-REEL7 exhibits a well-characterized input bias current crossover near 1.2–1.3 V below the positive rail (VS), as shown in Figure 12. Below that point, bias current flows *out* of the input pins (PNP stage active); above it, current flows *in* (NPN stage active). This transition is smooth and does not cause discontinuities in transducer interface circuits such as RTD or strain gauge bridges.
OP491GSZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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-SOIC
OP491GSZ-REEL7 FAQ
1.How can I place an order for OP491GSZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for OP491GSZ-REEL7 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 OP491GSZ-REEL7 reliable?
The price and inventory of OP491GSZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP491GSZ-REEL7 is usually 5 days.
3.What payment methods are accepted for OP491GSZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP491GSZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP491GSZ-REEL7?
OP491GSZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP491GSZ-REEL7 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 OP491GSZ-REEL7?
For technical support, including OP491GSZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP491GSZ-REEL7 requirements.
6.How does Aetrix verify that OP491GSZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All OP491GSZ-REEL7 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 OP491GSZ-REEL7 meets industry standards.
7.What is the process for return or replacement of OP491GSZ-REEL7?
All OP491GSZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with OP491GSZ-REEL7, 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 OP491GSZ-REEL7 part is unused and in its original packaging.
Return procedure for OP491GSZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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