OP177GSZ - Ultraprecision Op Amp | Analog Devices | 8-SOIC
MPN: OP177GSZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.19 | $2,190.00 |
Drop-in alternatives for OP177GSZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
OP2177ARZ
✅ Drop-In✓ In Stock
$1.78 / Unit
View Datasheet →OP07CSZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD8628ARZ
✅ Drop-In✓ In Stock
$0.85 / Unit
View Datasheet →OPA2277UA
✅ Drop-In📋 Reference alternative (not in catalog)
OP177GSZ Maximum Ratings & Electrical Characteristics
| Amplifier Type | General Purpose |
| Number of Circuits | 1 |
| Output Type | Single-ended |
| Slew Rate | 0.3 V/µs |
| Gain Bandwidth Product | 600 kHz |
| Input Offset Voltage | 60 µV (max) |
| Input Bias Current | 2.8 nA (max) |
| Supply Voltage Range | ±3 V to ±18 V |
| Open-Loop Gain | 120 dB |
| Common-Mode Rejection Ratio | 120 dB |
| Power Supply Rejection Ratio | 120 dB |
| Operating Temperature Range | -40°C to +85°C |
| Package | 8-SOIC |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
OP177GSZ Pin Configuration
| Pin 1 | OFFSET NULL — Offset null adjustment |
| Pin 2 | IN- — Inverting input |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | OFFSET NULL — Offset null adjustment |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply |
| Pin 8 | NC — No connection |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
OP177GSZ is suitable for 6 applications: Precision Instrumentation, Thermocouple Amplifier, Strain Gauge Amplifier, Active Filters, Medical Instrumentation, Industrial Process Control.
Precision Instrumentation
The OP177GSZ's low offset voltage (60 µV max) and low drift (0.3 µV/°C) make it ideal for precision instrumentation amplifiers. In a typical bridge amplifier configuration, the OP177GSZ amplifies small differential signals from strain gauges or thermocouples with high accuracy. Its high CMRR of 120 dB rejects common-mode noise, ensuring clean signal acquisition. The device operates from ±3 V to ±18 V, allowing use in both battery-powered and industrial systems. For best performance, use precision resistors in the feedback network to maintain overall accuracy.
Recommended
Thermocouple Amplifier
The OP177GSZ is well-suited for thermocouple signal conditioning due to its low input bias current (2.8 nA) and low offset voltage. In a cold-junction compensated thermocouple circuit, the OP177GSZ amplifies the small thermoelectric voltage (typically tens of microvolts per degree) with minimal error. Its low drift ensures stable readings over temperature. The device's wide supply range accommodates both 5V and ±15V systems. For cold-junction compensation, use a precision temperature sensor like the AD7314. The OP177GSZ's low noise (not specified but typical for bipolar) helps maintain signal integrity.
Recommended
Strain Gauge Amplifier
In strain gauge applications, the OP177GSZ provides the precision needed to measure tiny resistance changes. Its low offset voltage and drift minimize errors in the bridge output. The high open-loop gain of 120 dB ensures linear amplification. The OP177GSZ can be used in a differential amplifier configuration with four active gauges. Its common-mode rejection of 120 dB rejects noise from the excitation supply. For a complete solution, pair with a precision ADC like the AD7793. The device's bipolar input stage offers low noise, essential for high-resolution measurements.
Recommended
Active Filters
The OP177GSZ's gain bandwidth product of 600 kHz makes it suitable for low-frequency active filters, such as low-pass filters in data acquisition systems. Its low offset and drift ensure accurate DC performance in the passband. In a Sallen-Key topology, the OP177GSZ provides stable gain and low distortion. The device's high open-loop gain maintains filter accuracy. For higher-order filters, multiple OP177GSZ stages can be cascaded. The 8-SOIC package allows compact PCB layouts. Use precision resistors and capacitors to achieve the desired cutoff frequency and Q factor.
Recommended
Medical Instrumentation
The OP177GSZ is used in medical devices such as ECG and EEG amplifiers, where precision and low noise are critical. Its low offset voltage and drift ensure accurate biopotential measurements. The device's high CMRR rejects 50/60 Hz interference. The OP177GSZ operates from low supply voltages, making it suitable for battery-powered portable monitors. Its small 8-SOIC package is ideal for space-constrained designs. For safety, ensure proper isolation and use medical-grade power supplies. The OP177GSZ's reliability and long-term stability make it a trusted choice in medical electronics.
Recommended
Industrial Process Control
In industrial process control, the OP177GSZ provides accurate signal conditioning for sensors like pressure transmitters and flow meters. Its wide supply range (±3 V to ±18 V) allows integration into 24V industrial systems. The low offset and drift ensure precise control loop feedback. The device's high open-loop gain and CMRR reject noise from motors and power lines. The OP177GSZ can be used in PID controllers and data acquisition modules. For harsh environments, the industrial temperature range (-40°C to +85°C) ensures reliable operation. Pair with a precision ADC like the AD7793 for digital processing.
Recommended
Recommended Products Summary
Engineering reference data for OP177GSZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OP177GPZ | OP2177ARZ | OP07CSZ | AD8628ARZ | OPA2277UA |
|---|---|---|---|---|---|---|
| Package | 8-SOIC | 8-DIP | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Number of Circuits | 1 | 1 | 2 | 1 | 1 | 2 |
| Input Offset Voltage (max) | 60 µV | 60 µV | 50 µV | 150 µV | 5 µV | 50 µV |
| Gain Bandwidth Product | 600 kHz | 600 kHz | 800 kHz | 600 kHz | 2.5 MHz | 800 kHz |
| Supply Voltage Range | ±3 V to ±18 V | ±3 V to ±18 V | ±2.5 V to ±18 V | ±3 V to ±18 V | 2.7 V to 5 V (single) | ±2 V to ±18 V |
| Input Bias Current (max) | 2.8 nA | 2.8 nA | 2 nA | 7 nA | 30 pA | 1 nA |
| CMRR (min) | 120 dB | 120 dB | 120 dB | 110 dB | 130 dB | 120 dB |
Key Differentiators
- Ultraprecision performance at low cost (vs OP07CSZ)
- Pin-compatible with OP07 (vs OP07CSZ)
- Lower noise than chopper amplifiers (vs AD8628ARZ)
Design Notes
Decouple the power supply pins with 0.1 µF ceramic capacitors placed as close as possible to the V+ and V- pins. For noisy environments, add a 10 µF tantalum capacitor in parallel. Ensure the supply voltage does not exceed the absolute maximum rating of ±18 V to prevent damage.
For best performance, use a ground plane and keep the input traces short and shielded. Avoid routing high-frequency digital signals near the input pins. Use precision resistors with low temperature coefficient in the feedback network to maintain accuracy.
Do not exceed the input common-mode voltage range, which is typically from V- to V+ minus 2 V. Exceeding this range can cause output phase reversal. Also, ensure the load capacitance is not too high, as it may cause instability. Use a small series resistor if driving capacitive loads.
Compliance Information
RoHS compliant per Analog Devices product page. Not AEC-Q100 qualified.
