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Texas Instruments OPA2277PAG4
- Part No.:
- OPA2277PAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA2277PAG4.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,414
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Product details
Overview
OPA2277PAG4 from Texas Instruments is a dual high-precision operational amplifier designed for low-drift, low-noise signal conditioning in measurement-critical analog front-ends. It delivers 10 µV max input offset voltage, ±0.1 µV/°C drift, 134 dB open-loop gain, and operates from ±2 V to ±18 V supplies - enabling stable performance in weigh scales, temperature transmitters, and precision data acquisition systems.
For engineers reviewing the OPA2277PAG4 datasheet, OPA2277PAG4 pinout, OPA2277PAG4 application, or OPA2277PAG4 equivalent, this page provides verified pin functions, real-world thermal metrics, channel separation behavior, trim-capable architecture, and validated alternatives for industrial instrumentation design.
Technical Context
The OPA2277PAG4 implements a laser-trimmed bipolar input stage with internal bias current cancellation, eliminating need for external compensation resistors while maintaining ±1 nA max input bias current. Its unity-gain stability, absence of phase inversion, and rail-to-rail output swing (within 1.5 V of rails at 2 kΩ load) support robust operation in unbuffered sensor interfaces and low-power DAQ stages.
Unlike legacy op amps specified only at single supply voltages, the OPA2277PAG4 is characterized across ±5 V to ±15 V with consistent limits - ensuring predictable CMRR (140 dB), PSRR (130 dB), and AOL (134 dB) regardless of system supply configuration. Input protection includes 1-kΩ series resistors and diode clamps rated for ±30-V differential overvoltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±10 µV (typ), ±25 µV (max) at 25°C - enables sub-16-bit accuracy without trimming in bridge sensor amplifiers |
| Offset Drift | ±0.1 µV/°C (max) - ensures <1 µV total drift over 0–70°C ambient, critical for lab-grade instrumentation |
| Open-Loop Gain | 134 dB (min) - supports >120 dB closed-loop gain stability in high-resolution filter stages |
| CMRR / PSRR | 140 dB / 130 dB (min) - rejects power supply noise and common-mode interference in noisy industrial environments |
| Quiescent Current | 800 µA per amplifier - allows dual-channel precision amplification within 1.6 mA total, suitable for battery-powered field transmitters |
| Gain-Bandwidth | 1 MHz - sufficient for anti-aliasing filters up to 100 kHz and settling <16 µs to 0.01% for 10-V steps |
| Output Swing | (V−) + 1.5 V to (V+) − 1.5 V (at 2 kΩ) - maximizes dynamic range in ±15-V systems without rail saturation |
Pinout & Package
OPA2277PAG4 is housed in an 8-pin SOIC (D package), 3.91 mm × 4.90 mm body, with exposed thermal pad connected to V− for enhanced thermal dissipation (RθJA = 126.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Out A | Output channel A | Low-impedance buffered output capable of ±35 mA short-circuit current; drives 2 kΩ loads to full swing |
| 2 - −In A | Inverting input channel A | Differential input node with 250 GΩ || 3 pF common-mode impedance; accepts signals within (V−)+2 V to (V+)-2 V |
| 3 - +In A | Noninverting input channel A | High-Z input with matched thermal path to −In A; requires symmetrical layout to minimize thermoelectric offset |
| 4 - V− | Negative supply rail | Reference for internal biasing and thermal pad connection; must be low-impedance for optimal PSRR |
| 5 - +In B | Noninverting input channel B | Independent input for second channel; zero crosstalk coupling to channel A even under overload |
| 6 - −In B | Inverting input channel B | Fully isolated input stage - no shared nodes with channel A; enables dual-sensor simultaneous sampling |
| 7 - Out B | Output channel B | Unity-gain stable output with identical AC performance to Out A; supports independent feedback networks |
| 8 - V+ | Positive supply rail | Primary power reference; decoupling capacitor (0.1 µF) required adjacent to pin for EMI immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low drift architecture | ±0.1 µV/°C max drift enables <0.7 µV error over 70°C industrial range - eliminates recalibration in field-deployed transmitters |
| Internal bias current cancellation | ±1 nA max input bias current without external resistor - prevents added offset/noise in high-Z pH or thermocouple circuits |
| Overvoltage-protected inputs | ±30-V differential tolerance with 1-kΩ series resistors - withstands transient surges in industrial I/O modules without external clamping |
| Channel independence | No interaction between channels during overload or saturation - preserves integrity of dual-channel DAQ systems |
| EMI rejection ratio (EMIRR) | High immunity to RF rectification on +In pins - maintains DC accuracy in motor-drive or wireless-coexistence environments |
Applications
| Temperature Transmitter | Weigh Scale |
|---|---|
Use Scenario: Amplifying mV-level RTD or thermocouple outputs in 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end with cold-junction compensation interface. Use Value: ±25 µV offset and ±0.1 µV/°C drift ensure ≤0.1°C measurement uncertainty over full industrial temperature range. |
Use Scenario: Conditioning Wheatstone bridge outputs from load cells in platform or truck scales. IC Role / Device Role / Timing Role: Low-drift, low-noise gain stage before 24-bit ΣΔ ADC. Use Value: 0.22 µVPP (0.1–10 Hz) noise and 140 dB CMRR reject bridge excitation ripple and EMI in factory-floor environments. |
| Data Acquisition (DAQ) | Analog Input Module |
Use Scenario: Simultaneous sampling of multiple sensors in modular industrial DAQ systems. IC Role / Device Role / Timing Role: Dual-channel signal conditioner with independent, non-interacting amplifiers. Use Value: Channel separation >120 dB up to 100 kHz ensures cross-talk <−120 dB between adjacent channels in multi-channel cards. |
Use Scenario: Signal conditioning for programmable logic controller (PLC) analog input cards handling 0–10 V, ±5 V, or 4–20 mA inputs. IC Role / Device Role / Timing Role: High-PSRR, high-CMRR buffer and gain stage with overvoltage-tolerant inputs. Use Value: 130 dB PSRR and ±30-V input rating eliminate need for external protection in harsh plant-floor I/O modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2189IDR | Zero-drift auto-zero architecture; 0.005 µV/°C drift vs. OPA2277PAG4's ±0.1 µV/°C; higher 1/f noise (0.2 µVPP) | Better long-term stability in calibration-critical lab equipment; less suitable for wideband sensor interfaces due to chopping artifacts | Select OPA2189IDR when ultra-low drift dominates over broadband noise; verify absence of 100-kHz artifacts in signal chain |
| AD8629ARZ | CMOS input; 1 pA bias current vs. OPA2277PAG4's 1 nA; lower PSRR (110 dB) and CMRR (120 dB) | Superior for ultra-high-impedance pH or photodiode circuits; reduced noise rejection in noisy supply environments | Choose AD8629ARZ for femtoampere-level source impedances; add external supply filtering if PSRR <130 dB is insufficient |
Compared with OPA2277PAG4, OPA2189IDR offers superior drift but introduces chopper-related noise peaks, while AD8629ARZ enables pA-level bias current at the cost of 20 dB lower PSRR - making OPA2277PAG4 the balanced choice for general-purpose industrial precision amplification where supply noise and thermal stability are co-constrained.
Availability
OPA2277PAG4 is available at Aetrix Electronics and suitable for temperature transmitters, weigh scales, and data acquisition systems requiring stable component supply across extended product lifecycles and industrial temperature ranges.
Supply support for OPA2277PAG4 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 chains and power management ICs.
The OPAx277 product line was engineered specifically for high-accuracy industrial measurement systems - targeting applications where offset drift, noise, and supply rejection directly impact metrological validity in field-deployed instrumentation.
FAQ
What is the maximum supply voltage for OPA2277PAG4?
The OPA2277PAG4 supports dual supplies from ±2 V to ±18 V, with absolute maximum ratings up to ±18 V. The device maintains full specification compliance across ±5 V to ±15 V, and remains functional - though not fully characterized - at ±18 V. Exceeding ±18 V risks permanent damage per Absolute Maximum Ratings.
Does OPA2277PAG4 require external offset trim?
No - the OPA2277PAG4 does not provide external offset trim pins. Unlike the single-channel OPA277 (which has pins 1 and 8 for trimming), the dual-channel OPA2277PAG4 uses laser trimming only and has no dedicated trim terminals. Its ±25 µV max offset at 25°C and ±0.1 µV/°C drift typically eliminate need for user adjustment in most precision applications.
What is the thermal pad connection requirement for OPA2277PAG4?
The OPA2277PAG4 is packaged in SOIC (D), which does not include a thermal pad - that feature applies only to the DRM (VSON) variant. The PAG4 suffix confirms the 8-pin SOIC package (D), so no thermal pad connection is present or required. Thermal management relies on standard PCB copper pour under the package body and proper trace routing per TI's recommended layout guidelines.
Can OPA2277PAG4 drive capacitive loads?
Yes - the OPA2277PAG4 is unity-gain stable and can safely drive up to 1500 pF without oscillation, as verified in Figure 6-19 of the datasheet. For loads >1500 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is recommended to maintain phase margin. Output overshoot remains <10% at 1500 pF with G = ±1.
How does OPA2277PAG4 handle input overvoltage conditions?
The OPA2277PAG4 features integrated 1-kΩ series input resistors and diode clamps on both inputs, allowing it to withstand ±30-V differential input overvoltage without damage. During overvoltage events, current flows through the clamps - which may affect slewing in unity-gain followers but does not degrade long-term reliability or specifications.
OPA2277PAG4 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:
- 2
- Output Type:
- -
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 nA
- Voltage - Input Offset:
- 20 µV
- Current - Supply:
- -
- Current - Output / Channel:
- 35 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA2277PAG4 FAQ
1.How can I place an order for OPA2277PAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2277PAG4 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 OPA2277PAG4 reliable?
The price and inventory of OPA2277PAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2277PAG4 is usually 5 days.
3.What payment methods are accepted for OPA2277PAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2277PAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2277PAG4?
OPA2277PAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2277PAG4 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 OPA2277PAG4?
For technical support, including OPA2277PAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2277PAG4 requirements.
6.How does Aetrix verify that OPA2277PAG4 is sourced from the original manufacturer or authorized distributors?
All OPA2277PAG4 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 OPA2277PAG4 meets industry standards.
7.What is the process for return or replacement of OPA2277PAG4?
All OPA2277PAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2277PAG4, 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 OPA2277PAG4 part is unused and in its original packaging.
Return procedure for OPA2277PAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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