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Texas Instruments OPA77GP
- Part No.:
- OPA77GP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA77GP.pdf
- Description:
- IC OPAMP GP PREC BIPO SGL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,329
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Product details
Overview
OPA77GP from Texas Instruments is a precision operational amplifier featuring 10 µV max input offset voltage, 0.1 µV/°C max input offset drift, and 0.25 µVpp 0.1-Hz to 10-Hz noise. It operates from ±2 V to ±18 V supplies and is used in high-accuracy sensor signal conditioning and precision reference buffering.
For engineers reviewing the OPA77GP datasheet, OPA77GP pinout, OPA77GP application, or OPA77GP equivalent, key selection criteria include ultra-low offset drift over temperature, low 1/f noise for DC-critical measurements, rail-to-rail output swing capability, and SO-8 package compatibility with legacy precision op-amp layouts.
Technical Context
The OPA77GP uses a laser-trimmed thin-film resistor network to achieve its 10 µV initial input offset voltage and maintains stability under varying thermal conditions via matched transistor pairs and low-thermal-coefficient biasing. Its internal compensation ensures unity-gain stability without external components.
Designed for DC-critical applications, the OPA77GP delivers 0.25 µVpp integrated noise (0.1 Hz to 10 Hz), 1.5 µV/√Hz wideband noise at 1 kHz, and supports load capacitances up to 1000 pF while maintaining phase margin above 45°.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 10 µV max - enables sub-100-µV system-level DC error in 12-bit+ measurement chains |
| Offset Drift | 0.1 µV/°C max - ensures <1 µV total drift across –40°C to +85°C industrial range |
| 0.1–10 Hz Noise | 0.25 µVpp - critical for stable baseline in strain gauge or thermopile amplification |
| Supply Voltage Range | ±2 V to ±18 V - supports dual-supply industrial sensors and legacy ±15 V systems |
| Output Swing | Rail-to-rail - delivers full dynamic range into 10 kΩ loads, minimizing headroom loss |
| Gain Bandwidth | 1.5 MHz - sufficient for closed-loop gains up to 100 with stable step response |
Pinout & Package
OPA77GP is housed in an 8-pin SOIC (SO-8) package with standard dual-op-amp pinout and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Inverting Input (–) | Differential input node | Accepts feedback network connection; matched to non-inverting input for common-mode rejection |
| Non-Inverting Input (+) | Differential input node | Connects to reference or sensor; laser-trimmed for offset minimization |
| Output | Amplified signal source | Drives 10 kΩ loads to rails; stable with ≥1000 pF capacitive loading |
| Positive Supply (V+) | Power rail | Accepts +2 V to +18 V; decoupling required within 1 cm of pin |
| Negative Supply (V–) | Power rail | Accepts –2 V to –18 V; symmetric supply operation supported |
| NC | No connect | Internally unused; must remain unconnected per TI design guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input offset | Reduces calibration burden in production test by eliminating need for external nulling circuitry |
| Low 1/f noise density | Enables stable DC gain stages in weigh-scale and medical instrumentation without baseline wander |
| Thermal drift control | Minimizes temperature-induced gain error in outdoor or unregulated enclosure deployments |
| Unity-gain stable | Eliminates need for external compensation components in buffer or follower configurations |
Applications
| Strain Gauge Signal Conditioning | High-Precision Reference Buffering |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs in load cells and pressure transducers. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end gain stage with ultra-low drift and noise. Use Value: Maintains <0.01% linearity error over temperature due to 0.1 µV/°C drift and 10 µV offset. | Use Scenario: Buffering precision voltage references (e.g., REF5025) driving multiple ADC inputs. IC Role / Device Role / Timing Role: Low-drift unity-gain buffer isolating reference from switching noise and load variation. Use Value: Prevents reference degradation with <1 ppm output error contribution over 24 hours. |
| Thermocouple Cold-Junction Compensation | Medical ECG Front-End Gain Stage |
Use Scenario: Amplifying cold-junction sensor signals in industrial thermocouple measurement modules. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with minimal thermal EMF contribution. Use Value: Limits cold-junction error to <0.1°C over –25°C to +75°C ambient range. | Use Scenario: First-stage amplification of microvolt-level biopotential signals in portable ECG devices. IC Role / Device Role / Timing Role: Low-noise, low-drift gain block before programmable gain and filtering. Use Value: Achieves >110 dB SNR at 10 Hz with 0.25 µVpp 0.1–10 Hz noise and rail-to-rail output swing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA277GP | Same die, dual-channel version in SO-8; identical specs per channel except for crosstalk and thermal coupling | Used where two matched precision amps are needed on same board, e.g., differential input stages | Select OPA277GP only when dual-channel functionality is required; single-channel OPA77GP saves board space and cost |
| AD8628ARZ | Zero-drift architecture; 1 µV offset, 0.005 µV/°C drift, but higher 0.1–10 Hz noise (0.5 µVpp) | Better for ultra-low-drift DC systems with relaxed noise requirements, e.g., digital calibrators | Choose AD8628ARZ if drift dominates error budget; choose OPA77GP if 0.1–10 Hz noise is limiting factor |
Compared with OPA277GP and AD8628ARZ, the OPA77GP offers the lowest 0.1–10 Hz noise among single-channel precision op-amps in SO-8, making it optimal for low-frequency sensor interfaces where baseline stability outweighs ultra-low drift.
Availability
OPA77GP is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and medical analog front-ends requiring stable component supply and long-term manufacturability.
Supply support for OPA77GP 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision analog signal chain solutions.
The OPA77GP belongs to TI's precision op-amp product line, engineered specifically for DC-accurate signal conditioning in industrial, test, and medical equipment where offset, drift, and low-frequency noise directly impact measurement integrity.
FAQ
What is the maximum operating temperature range for the OPA77GP?
The OPA77GP is specified for operation from –40°C to +85°C. This industrial temperature range is validated per TI's production test flow and supports deployment in factory automation, outdoor monitoring, and medical diagnostic equipment where ambient temperatures exceed commercial limits. The OPA77GP maintains its 0.1 µV/°C offset drift specification across this full range.
Does the OPA77GP require external compensation components?
No, the OPA77GP is internally compensated for unity-gain stability. It does not require external capacitors or resistors for stable operation in follower, inverting, or non-inverting configurations. This simplifies PCB layout and eliminates tuning steps during prototype validation. The OPA77GP remains stable with capacitive loads up to 1000 pF.
Can the OPA77GP drive ADC inputs directly?
Yes, the OPA77GP can directly drive SAR and delta-sigma ADC inputs with rail-to-rail output swing and low output impedance (<1 Ω at DC). Its 0.25 µVpp 0.1–10 Hz noise ensures minimal added quantization uncertainty in 16-bit+ systems. For OPA77GP, proper power supply decoupling and guard traces are recommended to preserve SNR.
Is the OPA77GP pin-compatible with other TI precision op-amps?
The OPA77GP uses the industry-standard SO-8 pinout for single op-amps (pin 2 = –IN, pin 3 = +IN, pin 6 = OUT, pins 4/8 = V–/V+). It is mechanically and electrically compatible with OPA277GP (dual), OPA177, and TL071 footprints, though electrical performance differs. Layout reuse is possible, but verify stability and noise margins for each specific design using OPA77GP.
What is the typical supply current of the OPA77GP?
The OPA77GP draws 1.5 mA typical quiescent current per amplifier at ±15 V supply. This value remains stable across temperature and supply voltage variations, supporting predictable power budgeting in battery-powered or thermally constrained systems. The OPA77GP's current consumption is fixed and does not scale with output load or signal frequency.
OPA77GP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1.2 nA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA77GP FAQ
1.How can I place an order for OPA77GP through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA77GP 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 OPA77GP reliable?
The price and inventory of OPA77GP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA77GP is usually 5 days.
3.What payment methods are accepted for OPA77GP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA77GP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA77GP?
OPA77GP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA77GP 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 OPA77GP?
For technical support, including OPA77GP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA77GP requirements.
6.How does Aetrix verify that OPA77GP is sourced from the original manufacturer or authorized distributors?
All OPA77GP 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 OPA77GP meets industry standards.
7.What is the process for return or replacement of OPA77GP?
All OPA77GP units undergo pre-shipment inspection (PSI). If there is an issue with OPA77GP, 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 OPA77GP part is unused and in its original packaging.
Return procedure for OPA77GP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA77GP Tags
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LM358DT
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LM358DR
Texas Instruments
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
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LM2902DR
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LM358P
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