OP2177ARZ - Dual Precision Low Noise Op Amp | Analog Devices
MPN: OP2177ARZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.31 | $1.31 |
| 10 | $1.25 | $12.50 |
| 100 | $1.12 | $112.00 |
| 500 | $0.98 | $490.00 |
| 1,000 | $0.86 | $860.00 |
OP2177ARZ Overview
An operational amplifier (op amp) is a high-gain voltage amplifier with differential inputs and a single-ended output. It is a fundamental building block in analog electronics, used in signal conditioning, filtering, and mathematical operations. The OP2177 belongs to the precision op amp category, which prioritizes low offset voltage, low drift, and low noise over speed. Precision op amps are essential in applications where accuracy and stability are critical, such as medical instrumentation, industrial process control, and precision data acquisition systems.
Key features of the OP2177ARZ include a low noise density of 8 nV/√Hz typical, high common-mode rejection ratio (CMRR), power supply rejection ratio (PSRR), and open-loop gain (AVO) all greater than 120 dB minimum. The output stage is stable with capacitive loads over 100 pF, and the device is specified over the extended industrial temperature range of -40°C to +125°C. The 8-lead SOIC package is compact and widely used, facilitating easy PCB layout and manufacturing.
The OP2177 uses a precision bipolar process with laser-trimmed thin-film resistors to achieve its low offset and drift. The architecture provides excellent DC performance without the need for external nulling, simplifying design. The low supply current and wide supply range make it versatile for both single-supply and dual-supply applications. The device is fully specified for operation from -40°C to +125°C, ensuring reliable performance in harsh environments.
Typical applications include precision instrumentation, thermocouple and RTD signal conditioning, active filters, and precision voltage references. The low noise and low offset make it ideal for high-resolution ADC driver circuits and sensor front-ends. In these applications, the OP2177's low noise ensures minimal signal degradation, while its low offset voltage maintains accuracy over temperature.
When designing with the OP2177ARZ, ensure proper power supply decoupling with 0.1 µF ceramic capacitors close to the supply pins. The input common-mode range extends to the negative rail, but for best performance, keep inputs within the specified common-mode range. The output can swing close to the rails, but avoid heavy loads that may degrade linearity.
Drop-in alternatives for OP2177ARZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with OP2177ARZ (same form factor and footprint) — differing in Amplifier Type, Input Bias Current, Package, Slew Rate, Supply Voltage Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADA4610-2ARZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2.19 / Unit
View Datasheet →ADA4522-2ARZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.9 / Unit
View Datasheet →AD8606ARZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.3 / Unit
View Datasheet →OPA2177AIDR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
OPA2277AIDR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
OP2177ARZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | Precision, General Purpose |
| Number of Circuits | 2 |
| Supply Voltage - Dual | ±2.5 V to ±15 V |
| Gain Bandwidth Product | 1.3 MHz |
| Input Offset Voltage | 60 µV max |
| Input Offset Voltage Drift | 0.7 µV/°C max |
| Input Bias Current | 2 nA max |
| Input Offset Current | 0.2 nA typ |
| Voltage Noise Density | 8 nV/√Hz typ |
| Supply Current per Amplifier | 400 µA |
| CMRR | 120 dB min |
| PSRR | 120 dB min |
| Open-Loop Gain (AVO) | 120 dB min |
| Output Capacitive Load Stability | >100 pF |
| Operating Temperature Range | -40°C to +125°C |
| Package / Case | 8-SOIC |
| Mounting Type | Surface Mount |
OP2177ARZ Pin Configuration
| Pin 1 | OUT A — Output of amplifier A |
| Pin 2 | -IN A — Inverting input of amplifier A |
| Pin 3 | +IN A — Non-inverting input of amplifier A |
| Pin 4 | V- — Negative supply voltage |
| Pin 5 | +IN B — Non-inverting input of amplifier B |
| Pin 6 | -IN B — Inverting input of amplifier B |
| Pin 7 | OUT B — Output of amplifier B |
| Pin 8 | V+ — Positive supply voltage |
Typical Applications
OP2177ARZ is suitable for 6 applications: Precision Instrumentation Amplifier Front-End, Thermocouple and RTD Signal Conditioning, Active Filter for Data Acquisition, High-Resolution ADC Driver, Medical Monitoring and Diagnostic Instruments, Battery-Powered Portable Instrumentation.
Precision Instrumentation Amplifier Front-End
The OP2177ARZ is ideal for the integrator and amplifier stages in precision instrumentation systems because its 60 µV max offset and 0.7 µV/°C drift preserve DC accuracy over -40°C to +125°C. With 8 nV/√Hz voltage noise and CMRR greater than 120 dB, it rejects common-mode interference when placed right after a sensor bridge. To keep noise low, pair the op amp with a 0.1 µF supply decoupling cap on each rail and use metal-film resistors in the feedback network. The dual package lets one device condition two channels, reducing board space while maintaining the low bias current needed for high-impedance sensors.
Recommended
Thermocouple and RTD Signal Conditioning
For thermocouple cold-junction compensation and RTD linearization, the OP2177ARZ's low input bias current of 2 nA max minimizes resistive voltage errors, and its 0.7 µV/°C drift ensures stable gain across temperature excursions. The 1.3 MHz gain-bandwidth product is more than sufficient for DC and slow-scanning measurement channels, while 400 µA per amplifier supply current keeps self-heating low. Use the two amplifiers for an instrumentation difference stage and an output buffer, with a precision reference such as REF192ESZ to set the ADC span. The wide ±2.5 V to ±15 V supply range allows direct compatibility with 24 V industrial transmitters.
Recommended
Active Filter for Data Acquisition
The OP2177ARZ can implement low-pass, high-pass, and notch filters in data acquisition front-ends with low noise and high DC accuracy. Its 1.3 MHz GBP supports multiple-pole filters for anti-aliasing before SAR ADCs, while the 60 µV offset prevents filter passband DC shift. Because each amplifier consumes only 400 µA, a dual-pole Sallen-Key filter in one OP2177 package is power-efficient. For best performance, use 1% film capacitors and a low-noise supply. A companion 18-bit SAR ADC such as AD4003BRUZ will benefit from the OP2177's low output impedance and clean response.
Recommended
High-Resolution ADC Driver
In high-resolution data acquisition, the OP2177ARZ buffers and drives ADC inputs while maintaining 120 dB minimum AVO and PSRR, which minimizes gain and supply-ripple errors. Its 8 nV/√Hz noise floor is compatible with 16-bit to 20-bit conversion systems using a 5 V reference, and the low bias current prevents loading the input source. Add an RC filter between the op amp output and the ADC input, typically 10-50 Ω and 1-10 nF, to reduce charge-injection kickback. Recommended companion converters include AD7175-2BRUZ and AD7988-5BCPZ; both benefit from a clean precision driver stage.
Recommended
Medical Monitoring and Diagnostic Instruments
The OP2177ARZ's low offset, low noise, and low drift make it suitable for medical instrumentation such as ECG, blood-pressure, and temperature monitors. Its 400 µA supply current per amplifier extends battery life in portable monitors, while the -40°C to +125°C operating range supports harsh environments. The dual channel enables signal-conditioning stages plus a reference buffer on one SOIC-8. Pair with AD823ARZ for ECG front-end or with a low-power ADC for vital sign monitoring. Ensure input protection diodes and common-mode filtering are used to help meet medical safety standards.
Recommended
Battery-Powered Portable Instrumentation
With a 400 µA per channel supply current and ±2.5 V to ±15 V supply range, the OP2177ARZ is well suited to battery-powered portable instruments. It provides precision DC accuracy, 60 µV max offset and 0.7 µV/°C drift, without draining the battery, and the dual channel lets you implement a complete signal chain in one 8-SOIC. For low-voltage battery rails, choose a 5 V single-supply configuration with a proper common-mode bias network. The OP2177 can drive 10 kΩ loads with ease, and recommended companion parts include AD8606ARZ for rail-to-rail buffering and AD7793BRUZ for direct ADC interface.
Recommended
Recommended Products Summary
Engineering reference data for OP2177ARZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADA4610-2ARZ | ADA4522-2ARZ | AD8606ARZ | OPA2177AIDR | OPA2277AIDR |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Number of Channels | 2 | 2 | 2 | 2 | 2 | 2 |
| Voltage Noise Density | 8 nV/√Hz | 3.8 nV/√Hz | 5.8 nV/√Hz | 6.5 nV/√Hz | 8 nV/√Hz | 8 nV/√Hz |
| Supply Voltage Range (Dual) | ±2.5 V to ±15 V | ±4.5 V to ±15 V | ±4.5 V to ±27.5 V | 2.7 V to 5.5 V (single) | ±2.25 V to ±18 V | ±2.25 V to ±18 V |
Key Differentiators
- Very low 0.7 µV/°C maximum offset drift (vs ADA4610-2ARZ)
- Wide dual-supply range up to ±15 V (vs AD8606ARZ)
- Low 400 µA per amplifier supply current (vs OPA2277AIDR)
Design Notes
Decouple each supply pin with a 0.1 µF ceramic capacitor placed within 2 mm of the pin, plus a 10 µF bulk capacitor at the board input. According to the Analog Devices OPx177 datasheet, PSRR is greater than 120 dB, but proper decoupling ensures the rejection is not degraded by board inductance. For dual supplies, connect the midpoint ground reference close to the load to reduce ripple.
Keep input traces short and shielded for high-impedance sensor inputs. Use guard rings around the inverting and non-inverting inputs to reduce leakage, especially at high source impedances, and maintain copper pour clearance under the input pins. The OP2177 has 2 nA max input bias current, so a 1 MΩ source resistor produces only 2 mV error, but surface leakage can dominate in humid environments.
Do not exceed the maximum supply voltage rating of ±17 V or 35 V total as stated in the manufacturer datasheet. When driving capacitive loads beyond 100 pF, add a 10-50 Ω series resistor to maintain stability. Avoid connecting the output directly to low-impedance loads without current limiting; while the output stage has short-circuit protection, sustained thermal stress can reduce reliability.
Compliance Information
ADI 'Z' suffix often indicates lead-free/RoHS, but confirmed certification data was not present in the supplied snippets. Verify on the ADI product page before production.
