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Analog Devices Inc. OP181GS-REEL7
- Part No.:
- OP181GS-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OP181GS-REEL7.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,850
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Product details
Overview
OP181GS-REEL7 from Analog Devices is a single-channel, ultralow-power, rail-to-rail output operational amplifier optimized for battery-powered instrumentation and safety monitoring systems. It delivers 4 µA max supply current per amplifier, operates from 2.7 V to 12 V single supply (or ±1.35 V to ±6 V dual), achieves ±4.925 V output swing at ±5 V supply, features 1.5 mV max offset voltage, and supports –40°C to +85°C extended industrial temperature range.
For engineers reviewing the OP181GS-REEL7 datasheet, OP181GS-REEL7 pinout, OP181GS-REEL7 application, or OP181GS-REEL7 equivalent, this page provides verified electrical specifications, SOIC-8 package details, rail-to-rail output behavior under load, saturation recovery time (65–120 µs), and validated alternatives for low-power comparator and transducer interface use cases.
Technical Context
The OP181GS-REEL7 employs a precision bipolar input stage with PNP differential pair enabling rail-to-ground common-mode input range and nanoamp-level input bias current (3–10 nA). Its CMOS-based output stage achieves millivolt-level rail-to-rail swing while maintaining sub-4 µA quiescent current even when output is saturated at either supply rail.
It exhibits no phase reversal under overvoltage conditions, supports fast saturation recovery (65 µs @ +3 V, 120 µs @ ±5 V), and delivers 95–105 kHz gain bandwidth product with 70–75° phase margin - enabling stable unity-gain operation with capacitive loads up to 10 nF without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current/Amplifier | 4 µA max - enables multi-year battery life in remote sensors and portable medical devices. |
| Rail-to-Rail Output Swing | ±4.925 V @ ±5 V supply - preserves full dynamic range in low-voltage signal chains. |
| Input Offset Voltage | 1.5 mV max - ensures <1% error in 12-bit ADC front-ends with 3 V reference. |
| Gain Bandwidth Product | 105 kHz - supports DC–10 kHz signal conditioning for strain gages and thermistors. |
| Saturation Recovery Time | 65 µs @ +3 V - allows reliable use as low-power comparator in safety-critical threshold detection. |
| Input Bias Current | 10 nA max - minimizes voltage error across high-impedance sensor bridges (>1 MΩ). |
| Common-Mode Range | 0 V to 4 V @ +5 V supply - enables direct interfacing with ground-referenced transducers. |
Pinout & Package
OP181GS-REEL7 is housed in an 8-pin SOIC (SO-8) surface-mount package with standard JEDEC MS-012AC footprint (4.9 mm × 3.9 mm, 1.27 mm pitch). Pin 1 is marked by a notch or dot; pin numbering follows counterclockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Null (NC) | No internal connection - must be left unconnected or tied to GND for mechanical stability. |
| 2 | Inverting Input (–IN) | Differential input node; accepts signals within 0 V to 4 V common-mode range at +5 V supply. |
| 3 | Noninverting Input (+IN) | Differential input node; supports same common-mode range as Pin 2. |
| 4 | Negative Supply (V–) | Ground or negative rail connection; required for proper biasing of input stage. |
| 5 | Output (OUT) | Rail-to-rail output capable of sourcing/sinking ±3.5 mA; swings to within 25 mV of rails. |
| 6 | Positive Supply (V+) | +2.7 V to +12 V or ±1.35 V to ±6 V supply input; decoupling capacitor recommended. |
| 7 | Null (NC) | No internal connection - must remain unconnected. |
| 8 | Null (NC) | No internal connection - must remain unconnected. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal | Prevents catastrophic output inversion during input overvoltage - critical for safety monitoring loops. |
| Sub-4 µA supply current at rail saturation | Enables true micropower comparator operation without current spike on output saturation. |
| Input common-mode range to ground | Supports direct connection of ground-referenced sensors (e.g., half-bridge strain gages) without level-shifting. |
| 75° phase margin with 10 nF capacitive load | Permits direct driving of bypass caps or long PCB traces without external compensation network. |
| Offset voltage nulling terminals | Two dedicated pins allow trimming to <0.1 mV for precision instrumentation applications. |
Applications
| Battery-Powered Instrumentation | Safety Monitoring Systems |
|---|---|
Use Scenario: Portable blood glucose meter with electrochemical sensor and 3 V coin-cell power. IC Role / Device Role / Timing Role: Front-end transimpedance amplifier converting pA-level sensor current to voltage with rail-to-rail output into 12-bit SAR ADC. Use Value: 4 µA quiescent current extends CR2032 battery life beyond 2 years; rail-to-rail swing maximizes ADC utilization. |
Use Scenario: Industrial smoke detector with photoelectric chamber and low-power MCU. IC Role / Device Role / Timing Role: Comparator detecting threshold violation in analog smoke density signal; drives MCU interrupt line. Use Value: 65 µs saturation recovery ensures timely alarm response; no phase reversal prevents false negatives during transient overvoltage. |
| Remote Sensor Nodes | Low-Voltage Strain Gage Amplifiers |
Use Scenario: Wireless structural health monitor on bridge girder powered by energy-harvested solar cell. IC Role / Device Role / Timing Role: Signal conditioner for piezoresistive accelerometer; outputs conditioned signal to ultra-low-power ADC. Use Value: 10 nA input bias current avoids loading high-Z MEMS sensor; 2.7 V minimum supply enables operation during low-light harvesting. |
Use Scenario: Battery-operated torque wrench with quarter-bridge strain gage and 3.3 V supply. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end (configured as difference amp) with gain = 100. Use Value: Input offset drift of 10 µV/°C limits thermal error to <0.5% FS over –20°C to +70°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX40002DANA+ | Lower supply current (1.1 µA), but only 100 kHz GBW and no rail-to-rail input; 5-pin SOT23 package. | Best for ultra-long-life battery apps where bandwidth <10 kHz suffices and input common-mode range >0.5 V is acceptable. | Select MAX40002DANA+ only if supply current reduction outweighs need for rail-to-rail input and higher precision. |
| TLV8511IDBVR | Higher supply current (28 µA), rail-to-rail input/output, 1 MHz GBW, SO-8 package; lower offset (0.75 mV typ). | Suitable for higher-bandwidth sensor interfaces requiring >100 kHz response, but reduces battery life by 7× vs. OP181GS-REEL7. | Choose TLV8511IDBVR when system requires wider bandwidth or tighter offset spec, accepting higher power cost. |
Compared with MAX40002DANA+, OP181GS-REEL7 offers rail-to-rail input capability and superior offset voltage performance; compared with TLV8511IDBVR, it reduces quiescent current by 93% - making it optimal for multi-year battery deployments where bandwidth ≤105 kHz is sufficient.
Availability
OP181GS-REEL7 is available at Aetrix Electronics and suitable for battery-powered instrumentation, safety monitoring systems, and remote sensor nodes requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for OP181GS-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The OP181GS-REEL7 belongs to the OPx81 family of ultralow-power op amps designed specifically for micropower signal conditioning in battery-constrained and safety-critical applications where rail-to-rail output and robust overvoltage tolerance are essential.
FAQ
What is the maximum supply voltage rating for OP181GS-REEL7?
The absolute maximum supply voltage for OP181GS-REEL7 is +16 V for single-supply operation. However, the device is specified for reliable operation from +2.7 V to +12 V (single supply) or ±1.35 V to ±6 V (dual supply). Exceeding +12 V or ±6 V may cause parametric degradation or permanent damage, and operation above +16 V violates absolute maximum ratings.
Does OP181GS-REEL7 support rail-to-rail input, or only rail-to-rail output?
OP181GS-REEL7 supports rail-to-rail *output* swing but has a limited input common-mode voltage range: 0 V to 1 V below the positive supply (e.g., 0 V to +4 V at +5 V supply). It does not support true rail-to-rail input - the input cannot exceed V+ or go below V– by more than 0.6 V without risking phase reversal or ESD diode conduction.
Can OP181GS-REEL7 be used as a comparator, and what is its typical propagation delay?
Yes, OP181GS-REEL7 is explicitly qualified for comparator use due to no phase reversal and fast saturation recovery (65 µs @ +3 V). Propagation delay is not directly specified, but typical overdrive recovery time is 65–120 µs depending on supply voltage - making it suitable for low-speed threshold detection (<10 kHz), not high-speed digital logic replacement.
What is the thermal resistance (θJA) of the OP181GS-REEL7 SOIC-8 package?
The junction-to-ambient thermal resistance (θJA) for OP181GS-REEL7 in the SOIC-8 (S) package is 158°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board mounting; actual θJA will vary with PCB copper area and airflow.
Is there an offset voltage nulling option on OP181GS-REEL7, and how is it implemented?
Yes, OP181GS-REEL7 provides two dedicated offset null pins (Pins 1 and 8, both NC in standard configuration but internally connected to input stage nulling nodes). A 20 kΩ potentiometer with wiper tied to V– can reduce offset voltage to <0.1 mV. This feature is documented in the Theory of Operation section of the datasheet and applies specifically to the OP181GS-REEL7 variant.
OP181GS-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.028V/µs
- Gain Bandwidth Product:
- 100 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 3 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 3.3µA (x1 Channels)
- Current - Output / Channel:
- 3.5 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OP181GS-REEL7 FAQ
1.How can I place an order for OP181GS-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for OP181GS-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 OP181GS-REEL7 reliable?
The price and inventory of OP181GS-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP181GS-REEL7 is usually 5 days.
3.What payment methods are accepted for OP181GS-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP181GS-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP181GS-REEL7?
OP181GS-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP181GS-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 OP181GS-REEL7?
For technical support, including OP181GS-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP181GS-REEL7 requirements.
6.How does Aetrix verify that OP181GS-REEL7 is sourced from the original manufacturer or authorized distributors?
All OP181GS-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 OP181GS-REEL7 meets industry standards.
7.What is the process for return or replacement of OP181GS-REEL7?
All OP181GS-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with OP181GS-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 OP181GS-REEL7 part is unused and in its original packaging.
Return procedure for OP181GS-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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