OPA177FP - Precision Low-Noise Op Amp | Texas Instruments
Teilenummer: OPA177FP ✓ AktivOPA177FP Übersicht
An operational amplifier is an analog integrated circuit that amplifies the voltage difference between its inverting and non-inverting inputs. The precision bipolar category adds low input offset, low voltage drift, high open-loop gain, and low-noise characteristics to the general operational-amplifier function. Within the semiconductor hierarchy, OPA177FP belongs to the amplifier IC family and is designed for closed-loop gain, buffering, filtering, and signal-conditioning functions.
The OPA177FP combines a 25 uV maximum input offset voltage with 0.3 uV/°C maximum offset drift. Its open-loop gain reaches at least 130 dB, while the listed common-mode rejection reaches 140 dB. A typical quiescent current of 1.5 mA supports low-power signal-chain designs. The manufacturer positions the OPA177 as an effective alternative to chopper-stabilized amplifiers while retaining low-noise bipolar operation.
Its bipolar input architecture provides low input-noise voltage and good signal fidelity without the periodic output disturbance commonly associated with chopper-stabilized amplifiers. The 130 dB minimum open-loop gain supports accurate closed-loop amplification, while the high common-mode rejection reduces sensitivity to changes in the common voltage applied to both inputs. These characteristics make the device useful in low-level sensor, reference, and measurement circuits.
Typical applications include precision instrumentation, high-resolution data acquisition, low-level signal conditioning, sensor amplifiers, laboratory measurement equipment, and buffered analog inputs. OPA177FP is particularly appropriate when low offset, low drift, and low noise matter more than minimizing power dissipation or footprint area. The through-hole PDIP package also simplifies prototyping, inspection, and repair in laboratory or industrial equipment.
For best performance, follow the manufacturer datasheet when selecting input and output networks, balancing resistors, and bypass capacitors. Keep sensitive input traces short, use low-leakage insulation around high-impedance nodes, and provide adequate supply bypassing close to the power pins. Avoid using the offset-null pins as general-purpose bias or test points unless the circuit configuration has been reviewed.
This product page combines the exact OPA177FP ordering information, verified manufacturer and distributor references, package-specific pin assignments, application guidance, and a restricted comparison of pin-compatible replacements. It also highlights where additional electrical details must be confirmed in the OPA177 datasheet before a board-level design is released.
Drop-in-Alternativen für OPA177FP – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
OP07DP
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
OPA177FP Grenzwerte & elektrische Eigenschaften
| Amplifier Type | Single-circuit precision bipolar operational amplifier |
| Number of Channels | 1 channel |
| Input Offset Voltage | 25 uV maximum |
| Input Offset Drift | 0.3 uV/°C maximum |
| Open-Loop Gain | 130 dB minimum |
| Ruhestrom | 1.5 mA typical |
| Common-Mode Rejection | 140 dB |
| Gehäuse | 8-pin PDIP |
| Montageart | Through-hole |
OPA177FP Pin-Konfiguration
| Pin 1 | NC — Not connected (per datasheet) |
| Pin 2 | -IN — Inverting input |
| Pin 3 | +IN — Non-inverting input |
| Pin 4 | V- — Negative supply connection |
| Pin 5 | NULL — Offset null connection |
| Pin 6 | OUT — Output |
| Pin 7 | V+ — Positive supply connection |
| Pin 8 | NC — Not connected (per datasheet) |
Typische Anwendungen
OPA177FP ist geeignet für 6 Anwendungs: Precision Instrumentation Amplification, High-Resolution Data Acquisition, Low-Noise Sensor Signal Conditioning, Precision Voltage Reference Buffering, Laboratory Measurement Front Ends, Active Filtering and Signal Shaping.
Precision Instrumentation Amplification
OPA177FP fits low-level instrumentation because its 25 uV maximum input offset and 0.3 uV/°C maximum drift limit errors introduced by the amplifier itself. Its 130 dB minimum open-loop gain supports accurate closed-loop gain, while 140 dB common-mode rejection helps reject common voltage on both inputs. Place the device in the first gain stage of a sensor front end, where preserving small differential signals is most important. Verify common-mode range, output swing, and noise-gain stability against the actual bridge or transducer output. The bipolar, low-noise architecture is valuable when signal integrity matters more than minimum quiescent current.
Empfohlen
High-Resolution Data Acquisition
OPA177FP is suitable as the first analog amplifier ahead of a high-resolution converter because its low 25 uV maximum offset and 0.3 uV/°C maximum drift reduce errors before digitization. A quiescent current of 1.5 mA typical also allows reasonable power budgeting in multichannel acquisition equipment. Use the amplifier to buffer or differentially amplify sensor outputs while keeping trace lengths short and bypassing the supply pins locally. Check the ADC input range against the amplifier output swing, and include converter acquisition-time requirements when selecting the external feedback and filter components.
Empfohlen
Low-Noise Sensor Signal Conditioning
OPA177FP can condition low-level sensor signals without relying on the periodic disturbance associated with chopper-stabilized amplifiers. Its 25 uV maximum offset, 0.3 uV/°C maximum drift, and 140 dB common-mode rejection help preserve small differential measurements in pressure, temperature, and position sensing systems. Configure the stage for the required gain while observing the input common-mode range and output swing. Use short, guarded traces and stable reference resistors to prevent PCB leakage and temperature gradients from overwhelming the amplifier's low-offset performance.
Empfohlen
Precision Voltage Reference Buffering
OPA177FP can buffer a low-level reference voltage when the load requires low distortion and accurate DC behavior. Its 130 dB minimum open-loop gain reduces reference loading and its 25 uV maximum offset establishes the baseline input-referred error that must be included in the reference accuracy budget. Use a non-inverting or voltage-follower configuration where the output range allows it, and confirm that the source impedance does not create unacceptable bias-current error. Place the reference connection close to the amplifier and maintain clean ground returns to avoid adding more error than the offset specification.
Empfohlen
Laboratory Measurement Front Ends
OPA177FP is appropriate for laboratory instruments that amplify small signals while requiring stable offset and low added noise. The 8-pin PDIP package is convenient for through-hole prototype boards and repairable instrument construction, while the 1.5 mA typical quiescent current remains modest for a precision bipolar amplifier. Use it around strain-gauge bridges, thermocouple interfaces, or laboratory sensor conditioners after checking input bias current and common-mode limits. Validate drift at the enclosure's worst-case temperature and avoid placing the precision device next to noisy switching circuitry without appropriate isolation.
Empfohlen
Active Filtering and Signal Shaping
OPA177FP can support precision active filters when low offset, low drift, and low-noise behavior are more important than minimum power or smallest footprint. Its 130 dB minimum open-loop gain can improve closed-loop accuracy, but the selected filter topology must remain stable at the operating gain and signal bandwidth. Calculate resistor noise and capacitor tolerance in addition to amplifier noise, because passive-component variation can dominate a high-Q stage. Keep the layout symmetrical around sensitive input nodes and bypass the supply rails close to the device. Confirm the gain-bandwidth and slew-rate limits before extending the operating frequency.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für OPA177FP – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | OP07DP |
|---|---|---|
| Package | 8-pin PDIP | 8-pin PDIP - same package |
| Brand | Texas Instruments | Analog Devices |
| Number of Channels | 1 channel | 1 channel |
| Mounting Type | Through-hole | Through-hole |
Wichtigste Unterscheidungsmerkmale
- Documented low input offset (vs. OP07DP)
- Low thermal offset drift (vs. OP07DP)
- High open-loop gain and common-mode rejection (vs. OP07DP)
Designhinweise
Keep the OPA177FP input traces short and place the feedback components close to pins 2 and 3. For high-impedance sources, use a driven guard or careful physical shielding around the non-inverting input because surface contamination and leakage can exceed the 25 uV maximum offset. Connect the bypass capacitor directly between the supply pins and ground, and maintain a quiet return path to avoid converting ground currents into differential input error.
Do not assume that any 8-pin precision op amp is interchangeable with OPA177FP. Verify supply range, input common-mode range, output swing, offset-null behavior, stability, and electrical limits in the exact replacement datasheet. Leave pin 1 and pin 8 unconnected, and avoid populating a resistor between the two offset-null pins unless the manufacturer circuit has been evaluated. Incorrect use of the null pins can introduce drift, leakage, and noise that reduce the benefit of the low-offset amplifier.
Estimated: amplifier dissipation equals the supply voltage multiplied by current drawn from the positive rail, with additional output-stage contribution depending on the load. Using the documented 1.5 mA typical quiescent current and a 15 V total supply gives about 22.5 mW of quiescent dissipation. Actual dissipation can increase with output current and voltage difference across the output stage. Provide adequate spacing from heat sources and evaluate the worst-case ambient temperature and output load in the instrument enclosure.
Compliance-Informationen
The available product references do not explicitly state the compliance status of the exact OPA177FP orderable. Compliance and automotive qualification must be confirmed from the exact ordering documentation before use.