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Analog Devices Inc. OP181GP
- Part No.:
- OP181GP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OP181GP.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,928
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Product details
Overview
OP181GP from Analog Devices is a single-channel, ultralow-power, rail-to-rail output operational amplifier designed for precision signal conditioning in battery-powered systems. It delivers 4 µA max supply current per amplifier, 1.5 mV max offset voltage, and rail-to-rail output swing from 2.7 V to 12 V single supply - enabling use in safety monitoring, remote sensors, and low-voltage strain gage amplifiers.
For engineers reviewing the OP181GP datasheet, OP181GP pinout, OP181GP application, or OP181GP equivalent, key selection considerations include its guaranteed rail-to-rail output performance at sub-5 µA quiescent current, no phase reversal behavior, saturation recovery time of 65–120 µs, and extended industrial temperature range (–40°C to +85°C).
Technical Context
The OP181GP employs a precision bipolar input stage fabricated on Analog Devices' CBCMOS process, enabling wide input common-mode range (to ground) and low input bias current (3–10 nA). Its CMOS output stage supports millivolt-level output headroom to both rails while maintaining stable supply current even when saturated.
It features a gain-bandwidth product of 95–105 kHz, phase margin of 70–75°, and operates across ±1.35 V to ±6 V dual supplies or 2.7 V to 12 V single supply - with full specifications validated at +3 V, +5 V, and ±5 V. Propagation delay as comparator is 250 µs; saturation recovery time varies with supply voltage (65 µs at +3 V, 120 µs at ±5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current/Amplifier | 3.2–5 µA max over –40°C to +85°C - enables multi-year operation on coin-cell batteries in always-on sensor nodes. |
| Input Offset Voltage | 1.5 mV max (2.5 mV over temp) - supports accurate DC-coupled amplification without trimming in portable instrumentation. |
| Rail-to-Rail Output Swing | VOH = 4.925 V, VOL = 25 mV (at +5 V, RL = 100 kΩ) - preserves full dynamic range in 3.3 V or 5 V microcontroller ADC interfaces. |
| Gain Bandwidth Product | 95–105 kHz - sufficient for anti-aliasing, sensor buffering, and audio-band signal conditioning up to ~3 kHz. |
| Common-Mode Rejection Ratio | 65–95 dB (VCM = 0 V to +4 V) - maintains accuracy in noisy single-supply environments with ground-referenced inputs. |
| Saturation Recovery Time | 65–120 µs - allows reliable use as low-power comparator in window detection and threshold alarm circuits. |
| Input Bias Current | 3–10 nA - minimizes error in high-impedance transducer interfaces (e.g., pH electrodes, piezoresistive sensors). |
Pinout & Package
OP181GP is supplied in an 8-pin plastic DIP (N-8 package), with lead spacing of 0.300 inch and standard through-hole mounting. Pin 1 is marked by a notch or dot; orientation is consistent across all OP181 variants.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Null / No Connect | Internally unused; must be left unconnected or tied to ground for mechanical stability only. |
| 2 | Inverting Input (–IN) | Differential input node; accepts signals within 0 V to (V+) – 1 V common-mode range. |
| 3 | Non-Inverting Input (+IN) | Differential input node; same common-mode range as Pin 2; supports input down to ground. |
| 4 | Negative Supply (V–) | Ground reference for single-supply operation; connects to system GND or negative rail in dual-supply mode. |
| 5 | No Connect (NC) | Not bonded; electrically isolated - must remain unconnected. |
| 6 | Output (OUT) | Class-AB CMOS output capable of sourcing/sinking current while swinging within 25 mV of either rail. |
| 7 | Positive Supply (V+) | Accepts 2.7–12 V single supply or +VS in dual-supply configuration; PSRR ≥ 76 dB. |
| 8 | Null / No Connect | Internally unused; must be left unconnected or tied to ground for mechanical stability only. |
Key Features
| Feature | Design Value |
|---|---|
| No Phase Reversal | Guaranteed operation with input common-mode voltage extending below V– (to –5 V), preventing output inversion during overvoltage transients. |
| Ultralow Quiescent Current | ≤4 µA per amplifier across full temperature range - reduces battery load by >90% vs. standard precision op amps. |
| Rail-to-Rail Output with Load Drive | Maintains rail-to-rail swing while sourcing/sinking up to ±3.5 mA - supports direct interface to ADC references and LED drivers. |
| Offset Voltage Nulling Terminals | Pins 1 and 8 allow external 20 kΩ potentiometer to trim offset to <100 µV - critical for DC-coupled medical sensor front ends. |
| Fast Saturation Recovery | 65 µs recovery at +3 V supply - enables robust comparator use in low-duty-cycle wake-up circuits and fault detection. |
Applications
| Battery-Powered Instrumentation | Safety Monitoring Systems |
|---|---|
Use Scenario: Portable gas detector with electrochemical sensor and 3 V coin-cell power source requiring continuous analog signal amplification. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier for sensor output, operating at 3.3 µA quiescent current to extend battery life beyond 5 years. Use Value: Enables >100,000 measurement cycles per CR2032 cell while maintaining 1.5 mV offset accuracy and rail-to-rail output compatibility with 12-bit SAR ADC. |
Use Scenario: Industrial equipment shutdown circuit detecting overtemperature via thermistor bridge in hazardous location. IC Role / Device Role / Timing Role: Low-power comparator with 250 µs propagation delay and no phase reversal, triggering relay driver upon threshold breach. Use Value: Guarantees fail-safe response under brownout conditions (2.7 V supply) and survives ESD events up to 4 kV per HBM. |
| Remote Sensor Nodes | Low-Voltage Strain Gage Amplifiers |
Use Scenario: Wireless structural health monitor using MEMS accelerometer and LoRaWAN transmitter powered by solar harvester. IC Role / Device Role / Timing Role: Signal conditioner for low-noise (75 nV/√Hz), high-Z sensor output, operating from intermittent 2.8–4.2 V supply. Use Value: Delivers 10 µV p-p 0.1–10 Hz noise floor and 3 nA input bias - preserving resolution of sub-microstrain measurements. |
Use Scenario: Battery-operated torque wrench calibrator using quarter-bridge strain gage with 350 Ω elements. IC Role / Device Role / Timing Role: Instrumentation-grade amplifier with 95 dB CMRR and 10 µV/°C drift, configured in differential mode. Use Value: Achieves ±0.05% full-scale linearity over –10°C to +60°C without calibration, reducing field service requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4040ASA+ | Higher supply current (10 µA), lower GBW (50 kHz), no offset null pins | Limited to lower-precision, non-DC-critical sensor buffering | Preferred where cost sensitivity outweighs offset trim requirement and battery life is secondary |
| LPV521MG/NOPB | Lower supply current (320 nA), higher offset (3.5 mV), no rail-to-rail input | Suitable only for ultra-low-power, AC-coupled, non-precision applications | Chosen when nanowatt operation is mandatory and input common-mode range >0.5 V is acceptable |
Compared with MAX4040ASA+ and LPV521MG/NOPB, OP181GP uniquely balances sub-5 µA quiescent current, 1.5 mV offset, rail-to-rail output, and offset-null capability - making it the only option supporting precision DC measurement in long-life battery systems without external trimming components.
Availability
OP181GP is available at Aetrix Electronics and suitable for battery-powered instrumentation, safety monitoring, and remote sensor node designs requiring stable component supply across extended industrial temperature ranges and multi-year production cycles.
Supply support for OP181GP 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 OP181GP belongs to the OPx81 family of ultralow-power rail-to-rail op amps, engineered specifically for precision analog signal conditioning in energy-constrained, single-supply systems where battery life, DC accuracy, and reliability are critical.
FAQ
What is the maximum supply voltage rating for OP181GP?
The absolute maximum supply voltage for OP181GP is +16 V across V+ and V– terminals. However, functional operation is specified from 2.7 V to 12 V single supply or ±1.35 V to ±6 V dual supply. Operating above 12 V risks exceeding internal junction temperature limits and voiding parametric guarantees - always observe derating curves in the thermal section of the OP181GP datasheet.
Does OP181GP support true rail-to-rail input?
No, OP181GP does not feature rail-to-rail input. Its input common-mode voltage range extends from V– (ground in single supply) to (V+) – 1 V. For example, at +5 V supply, valid input range is 0 V to +4 V. This design enables bipolar input stage performance (low noise, low IB) while retaining single-supply usability - unlike rail-to-rail input op amps that use MOS inputs with higher noise and bias current.
Can OP181GP be used as a comparator, and what is its typical response time?
Yes, OP181GP is explicitly characterized for comparator use due to no phase reversal and fast saturation recovery. Propagation delay is 250 µs under AV = 1, VO = 1 V step conditions. Saturation recovery time is 65 µs at +3 V supply and increases to 120 µs at ±5 V - making it suitable for low-frequency threshold detection but not high-speed digital logic replacement.
What is the purpose of Pins 1 and 8 on OP181GP, and how should they be handled?
Pins 1 and 8 on OP181GP are designated "NULL" and are internally unconnected. They must remain unconnected in PCB layout. While some users tie them to ground for mechanical rigidity, Analog Devices documentation states no electrical function - doing so introduces no benefit and risks unintended coupling paths in high-impedance circuits. Always follow the N-8 package footprint exactly as defined in the OP181GP datasheet.
How does OP181GP maintain low supply current when the output is driven to the rail?
OP181GP uses a patented CMOS output stage architecture that avoids the current surge typical of conventional rail-saturated op amps. Unlike BJTs or depletion-mode MOSFETs, its output transistors operate in linear region near the rails, drawing only 3.2–5 µA total supply current regardless of output state - verified across –40°C to +85°C. This behavior is intrinsic to the CBCMOS process and is guaranteed in the Electrical Specifications table under ISY conditions.
OP181GP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OP181GP FAQ
1.How can I place an order for OP181GP through Aetrix?
Please submit a Request for Quotation (RFQ) for OP181GP 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 OP181GP reliable?
The price and inventory of OP181GP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP181GP is usually 5 days.
3.What payment methods are accepted for OP181GP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP181GP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP181GP?
OP181GP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP181GP 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 OP181GP?
For technical support, including OP181GP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP181GP requirements.
6.How does Aetrix verify that OP181GP is sourced from the original manufacturer or authorized distributors?
All OP181GP 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 OP181GP meets industry standards.
7.What is the process for return or replacement of OP181GP?
All OP181GP units undergo pre-shipment inspection (PSI). If there is an issue with OP181GP, 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 OP181GP part is unused and in its original packaging.
Return procedure for OP181GP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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