OP177FSZ-REEL - Ultraprecision Op Amp, 25uV VOS, 8-SOIC | ADI
MPN: OP177FSZ-REEL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.59 | $75.90 |
| 100 | $6.55 | $655.00 |
| 500 | $5.78 | $2,890.00 |
| 1,000 | $5.05 | $5,050.00 |
OP177FSZ-REEL Overview
An operational amplifier is a high-gain DC-coupled differential amplifier that forms the universal analog building block for signal conditioning, filtering, amplification, and comparison. Precision op amps such as the OP177 are a sub-class optimized for very low input-referred offset, low drift over the operating temperature range, high open-loop gain, high common-mode rejection, and high power-supply rejection. They sit within the hierarchy op amp -> amplifier IC -> integrated circuit -> semiconductor and are widely used where measurement accuracy directly depends on the amplifier rather than on downstream calibration.
The OP177FSZ-REEL delivers 12 V/uV typical open-loop gain with excellent gain linearity, 130 dB minimum CMRR, 115 dB minimum PSRR, and a maximum supply current of 2.0 mA. Its low noise bipolar input stage eliminates the need for external VOS adjustment, simplifying factory calibration and improving long-term system accuracy across industrial temperature ranges.
Architecturally, the device uses a monolithic bipolar process with on-chip laser trimming of thin-film resistors to achieve the 25 uV maximum VOS specification. The high open-loop gain and gain linearity preserve accuracy in high closed-loop gain configurations such as 100x or 1000x instrumentation front ends.
Typical applications include precision instrumentation amplifiers, strain-gauge and thermocouple signal conditioning, high-accuracy analog front ends for data acquisition systems, precision voltage references and regulators, and high-resolution weighing scales. It is also commonly used as a low-drift buffer for DAC outputs and ADC reference chains.
When designing with the OP177FSZ-REEL, pay attention to input bias current paths and use guarding on the input traces to minimize leakage on high-impedance sources. The 8-SOIC package allows standard PCB layouts and accepts standard decoupling - a 0.1 uF ceramic close to the supply pins and a larger bulk capacitor at the board supply entry.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for OP177FSZ-REEL — 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 OP177FSZ-REEL (same form factor and footprint) — differing in Amplifier Type, Package, Mounting Type, Operating Temperature Range, Common Mode Rejection Ratio.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
OP177FSZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
OP177FS
✅ Drop-In📋 Reference alternative (not in catalog)
OP177GSZ-REEL7
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →OP177GPZ
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3.1 / Unit
View Datasheet →OP177FZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
OP177FSZ-REEL Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices Inc. |
| Amplifier Type | Precision Operational Amplifier |
| Number of Channels | 1 |
| Package | 8-SOIC (FS, 0.154 inch / 3.90 mm width) |
| Input Offset Voltage (VOS) Maximum | 25 uV at 25 C |
| Offset Voltage Drift (TCVOS) Maximum | 0.1 uV/degree C |
| Open-Loop Gain (Avol) Typical | 12 V/uV |
| Gain Linearity | Excellent (per datasheet) |
| Common-Mode Rejection Ratio (CMRR) Minimum | 130 dB |
| Power-Supply Rejection Ratio (PSRR) Minimum | 115 dB |
| Supply Current Maximum | 2.0 mA |
| Input Stage | Bipolar (low noise) |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| Mounting Type | Surface Mount |
| Reel Quantity | 2500 (7-inch reel) |
| RoHS Status | Compliant |
OP177FSZ-REEL Pin Configuration
| Pin 1 | NC / OFFSET NULL — No connection or offset null (datasheet pin-1 function) |
| Pin 2 | IN- — Inverting input |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | V- — Negative supply |
| Pin 5 | NC / OFFSET NULL — No connection or offset null (datasheet pin-5 function) |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply |
| Pin 8 | NC — Not connected (per datasheet) |
Typical Applications
OP177FSZ-REEL is suitable for 7 applications: Precision Instrumentation Amplifier, Strain-Gauge and Weigh-Scale Signal Conditioning, Thermocouple and RTD Front-End, High-Resolution Data Acquisition Systems, Precision Voltage Reference Buffer, DAC Output Buffer and Summation Node, Medical Instrumentation Signal Chain.
Precision Instrumentation Amplifier
The OP177FSZ-REEL is ideal as the input stage of three-op-amp instrumentation amplifiers for strain-gauge and load-cell signal chains. Its 25 uV maximum VOS and 0.1 uV/degree C drift eliminate the need for external VOS adjustment, while 130 dB minimum CMRR rejects common-mode pickup from industrial sensors. The 12 V/uV typical open-loop gain preserves gain accuracy at closed-loop gains of 100x or 1000x, and the bipolar input stage avoids chopper noise spikes. Used with precision thin-film resistor networks, it achieves system accuracy limited by the sensor rather than the amplifier.
Recommended
Strain-Gauge and Weigh-Scale Signal Conditioning
Weigh scales and strain-gauge bridges produce differential outputs in the millivolt range that demand very low drift and high CMRR. The OP177FSZ-REEL delivers 25 uV maximum VOS and 0.1 uV/degree C drift, allowing the bridge excitation voltage to be set without compensating for amplifier drift. Its 115 dB minimum PSRR rejects supply noise on industrial 24V rails, and the low 2.0 mA supply current supports battery-powered portable scales. The 8-SOIC package is compatible with high-density PCB layouts in modern scale heads.
Recommended
Thermocouple and RTD Front-End
Thermocouple and RTD front-ends require low drift, high CMRR, and low input-referred offset to resolve microvolt-level signals across wide temperature spans. The OP177FSZ-REEL provides 0.1 uV/degree C drift, which translates to negligible thermocouple-reference error over the operating range. Its 130 dB CMRR rejects 50/60 Hz mains pickup on long sensor cables. With 2.0 mA supply current and 8-SOIC packaging, it enables compact, low-power temperature transmitters that meet NIST-traceable calibration accuracy.
Recommended
High-Resolution Data Acquisition Systems
In 16-bit to 20-bit data acquisition systems, the front-end amplifier VOS and drift directly limit the effective ENOB. The OP177FSZ-REEL with 25 uV maximum VOS contributes only 25 uV of input error - negligible compared with a 5V reference and a 16-bit ADC's 76 uV LSB. Its 115 dB PSRR rejects switching noise from upstream DC-DC converters, and the bipolar low-noise input avoids the kickback of CMOS switches. The 8-SOIC package accepts standard SMT assembly for high-channel-density DAQ boards.
Recommended
Precision Voltage Reference Buffer
The OP177FSZ-REEL serves as a low-drift unity-gain buffer for precision voltage references such as the AD588 or AD584. Its 0.1 uV/degree C drift closely tracks the reference, preserving system accuracy across the industrial -40 C to +85 C range. With 12 V/uV typical open-loop gain, the buffer error remains below 1 ppm even at full output. The bipolar input stage avoids the leakage currents of CMOS-input buffers that would degrade high-impedance reference nodes.
Recommended
DAC Output Buffer and Summation Node
Precision DACs require low-offset, low-drift output buffers to preserve linearity at small codes. The OP177FSZ-REEL with 25 uV maximum VOS adds less than 1 LSB error at a 16-bit level with a 5V full scale, while its 0.1 uV/degree C drift maintains accuracy over temperature. The 130 dB CMRR rejects common-mode shifts when summing multiple DAC channels. The 8-SOIC package simplifies PCB layout for multi-channel audio or instrumentation DAC boards.
Recommended
Medical Instrumentation Signal Chain
Medical instrumentation such as ECG, EEG, and patient monitors demands very low input-referred noise and high CMRR for safety-rated isolation. The OP177FSZ-REEL with 130 dB minimum CMRR rejects 50/60 Hz interference on patient leads, while the low-noise bipolar input preserves microvolt-level biosignals. Its 0.1 uV/degree C drift supports long calibration intervals mandated by medical device regulations. The 8-SOIC surface-mount package meets the small-form-factor requirements of bedside and wearable medical electronics.
Recommended
Recommended Products Summary
Engineering reference data for OP177FSZ-REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OP177FSZ-REEL7 | OP177FS | OP177GSZ-REEL | OP177GPZ | OP177FZ |
|---|---|---|---|---|---|---|
| Package | 8-SOIC (FS) | 8-SOIC (FS) - same | 8-SOIC (FS) - same | 8-SOIC (GS) - same footprint | 8-PDIP - different footprint | 8-CDIP - different footprint |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Channels | 1 | 1 | 1 | 1 | 1 | 1 |
| Shipping Format | 7-inch reel, 2500 pcs | 7-inch reel, 1000 pcs | Tube | 7-inch reel | Tube (PDIP) | Tube (CDIP) |
Key Differentiators
- Chopper-class DC precision without chopper noise spikes (vs True chopper-stabilized amplifiers)
- Pin-compatible same-package variants for production flexibility (vs OP177FSZ-VREEL7, OP177FS, OP177GSZ-VREEL)
- Industrial -40 C to +85 C operating range with 0.1 uV/degree C drift (vs Commercial-grade precision op amps)
Design Notes
Decouple each supply pin with a 0.1 uF ceramic capacitor placed within 5 mm of the OP177FSZ-VREEL package pins, plus a 10 uF bulk tantalum or ceramic capacitor at the board supply entry. The OP177's 115 dB minimum PSRR rejects most supply noise, but the 0.1 uF local decoupling prevents high-frequency switching noise from coupling into the input stage through the supply traces. For dual-supply operation, bypass both V+ and V- symmetrically.
Use a guarding technique around the inverting and non-inverting inputs on high-impedance sources. A driven guard trace held at the same potential as the input reduces leakage across the PCB surface, which becomes significant at source impedances above 1 Mohm. Keep input traces short and surrounded by ground plane on the layer below. For instrumentation-grade circuits, use a teardrop pattern where traces meet pads to reduce stress and improve yield.
Do not assume the OP177FSZ-REEL is a chopper-stabilized amplifier. Although it achieves chopper-class DC precision, it uses a bipolar input stage that does not exhibit chopper spikes. This makes it superior to true chopper amps in low-frequency noise and input bias current, but it still has finite bias current of ~1.2 nA typical. For source impedances above 100 kohm, verify that the offset due to input bias current does not exceed your system error budget.
The OP177FSZ-VREEL 8-SOIC package has a theta_JA of approximately 150 C/W. At 2.0 mA supply current and plus-minus 15V supplies, internal dissipation is 60 mW, producing a junction temperature rise of 9 C above ambient - well within the -40 C to +85 C industrial range. However, in enclosed housings or stacked PCBs, ensure adequate airflow or thermal vias to the ground plane to avoid derating. The exposed pad (if present on the package variant) should be soldered to a copper pad for additional heat spreading.
Compliance Information
RoHS and REACH compliant per Z suffix in MPN. Lead-free reflow compatible. Not AEC-Q100 qualified - not intended for automotive applications. MSL level not provided in source data.
