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Texas Instruments OPA277P
- Part No.:
- OPA277P
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA277P.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:386
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Product details
Overview
OPA277P from Texas Instruments is a single 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 use in weigh scales, temperature transmitters, and precision data acquisition systems.
For engineers reviewing the OPA277P datasheet, OPA277P pinout, OPA277P application, or OPA277P equivalent, this page provides verified technical context, real-world performance boundaries (including trim-pin functionality and thermal behavior in PDIP), package-specific layout guidance, and validated alternative options for precision op amp selection.
Technical Context
The OPA277P 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 dual offset trim pins (1 and 8) support manual nulling of residual offset - a feature exclusive to the single-channel OPA277 variant and not present in OPA2277 or OPA4277.
It is unity-gain stable, phase-inversion-free, and specified across ±5 V to ±15 V supply range with consistent 140 dB CMRR and 130 dB PSRR performance - unlike many precision op amps limited to single-supply test conditions. Input protection includes 1-kΩ series resistors and diode clamps enabling ±30-V differential input tolerance without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input offset voltage | ±10 µV (typ), ±20 µV (max) at 25°C - enables sub-20-µV system-level DC accuracy without trimming in most applications |
| Offset voltage drift | ±0.1 µV/°C (max) over –40°C to +85°C - ensures <1 µV total drift across industrial temperature range |
| Open-loop gain | 134 dB (min) - supports high closed-loop gain stability with <0.005% gain error at G = 1000 |
| CMRR / PSRR | 140 dB / 130 dB (min) - rejects >100 dB of common-mode or supply noise at DC, critical for ratiometric sensor interfaces |
| Quiescent current | 800 µA per amplifier (typ) - allows precision performance in battery-powered DAQ and portable instrumentation |
| Supply range | ±2 V to ±18 V - supports operation from low-voltage rails (e.g., ±2.5 V) up to industrial ±15 V without derating |
| Output swing | (V–) + 1.5 V to (V+) – 1.5 V (RL = 2 kΩ) - delivers >27 V p-p swing on ±15 V supplies, maximizing dynamic range |
Pinout & Package
OPA277P is supplied in an 8-pin PDIP (Plastic Dual In-line Package) with body size 6.35 mm × 9.81 mm. This through-hole package supports prototyping, legacy board upgrades, and high-reliability industrial assembly where lead integrity and thermal mass are prioritized.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim | Input for external potentiometer to null amplifier offset voltage; leave floating if unused |
| 2 | –In | Inverting input; high-impedance node requiring matched thermal layout to minimize thermoelectric offset |
| 3 | +In | Noninverting input; same thermal sensitivity as Pin 2 - critical for low-drift PCB routing |
| 4 | V– | Negative supply rail; connects to system ground or negative voltage; serves as reference for internal bias network |
| 5 | NC | No internal connection; must remain unconnected and unstubbed to avoid parasitic coupling |
| 6 | Output | Class-A output stage capable of ±35 mA short-circuit current; drives capacitive loads up to 1500 pF stably |
| 7 | V+ | Positive supply rail; decoupling capacitor (0.1 µF) required close to this pin for EMI immunity and PSRR maintenance |
| 8 | Offset Trim | Second trim terminal completing external nulling circuit; paired with Pin 1 per Figure 7-1 in datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input stage | Delivers ±20 µV max offset and ±0.15 µV/°C max drift over temperature - eliminates factory calibration in most precision sensor circuits |
| Integrated bias current cancellation | Reduces input bias current to ±1 nA max without external resistor - avoids added offset and noise from RB = R1||R2 networks |
| Dual offset trim pins | Enables post-mounting DC nulling via 20-kΩ potentiometer - unique to OPA277 (not available on OPA2277/OPA4277) |
| Robust input protection | Withstands ±30-V differential input with 1-kΩ series resistors and clamp diodes - prevents damage during sensor disconnect or ESD events |
| EMI rejection ratio (EMIRR) | High immunity to RF rectification at +In pin - maintains DC accuracy in noisy industrial environments without additional filtering |
Applications
| Weigh Scale Front-End | Temperature Transmitter |
|---|---|
Use Scenario: Amplifies mV-level output from load cell bridges under varying ambient temperatures and mechanical stress. IC Role / Device Role / Timing Role: Precision DC-coupled difference amplifier with ultra-low drift to preserve microvolt-level resolution across –40°C to +85°C. Use Value: ±0.1 µV/°C drift ensures ≤0.85 µV total offset shift over 85°C span - directly enabling 24-bit effective resolution without recalibration. |
Use Scenario: Conditions RTD or thermocouple signals in process control loops with 4–20 mA output stages. IC Role / Device Role / Timing Role: Low-noise, rail-swinging instrumentation amplifier driver with stable gain and minimal self-heating error. Use Value: 0.22 µVPP 0.1–10 Hz noise and ±20 µV offset allow detection of <0.01°C temperature changes in 100-Ω Pt RTD configurations. |
| Pressure Transmitter Signal Chain | Lab Instrumentation DAQ |
Use Scenario: Interfaces piezoresistive pressure sensors with high common-mode voltage and low full-scale output. IC Role / Device Role / Timing Role: High-CMRR (140 dB) in-amp front-end stage rejecting supply and ground noise in harsh plant environments. Use Value: 140 dB CMRR attenuates 100 mV CM noise to <10 nV at output - preserving signal integrity when sensor leads run alongside AC power cables. |
Use Scenario: Serves as programmable-gain amplifier and anti-alias filter driver in modular benchtop data acquisition units. IC Role / Device Role / Timing Role: Unity-gain stable, fast-settling (14 µs to 0.1%) buffer for ADC input with minimal THD+N (0.002% at 1 kHz). Use Value: 1 MHz GBW and 0.8 V/µs slew rate support accurate digitization of 100-kHz sine waves with <–100 dB harmonic distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2277P | Dual-channel version with identical offset (±10 µV), drift (±0.1 µV/°C), and supply range; no trim pins | Used where space-constrained PCBs require two matched amplifiers (e.g., in-amp + reference buffer) | Select OPA2277P only when dual-channel integration reduces component count without sacrificing trim capability |
| OPA2182IDR | Zero-drift auto-zero architecture; 0.02 µV/°C drift, 4.2 nV/√Hz noise; higher quiescent current (1.2 mA) | Better long-term stability in metrology-grade equipment; less suitable for battery-powered devices due to higher IQ | Choose OPA2182IDR when drift-critical applications demand <0.1 µV total drift over 10 years, accepting higher power and cost |
Compared with OPA2277P and OPA2182IDR, the OPA277P uniquely balances ultra-low drift, trimmability, and low power in a single-channel PDIP package - making it optimal for legacy-compatible, manually calibrated, or space-tolerant precision analog designs.
Availability
OPA277P is available at Aetrix Electronics and suitable for weigh scale manufacturing, temperature transmitter production, and lab instrumentation development requiring stable component supply with long-term industrial lifecycle support.
Supply support for OPA277P 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 leader specializing in analog and embedded processing technologies, with decades of precision op amp innovation and automotive/industrial qualification expertise.
The OPAx277 product line was engineered specifically for high-stability DC signal conditioning in industrial process control, test equipment, and sensor interface applications - replacing OP-177 with superior noise, speed, and power efficiency.
FAQ
What is the maximum allowable supply voltage for OPA277P?
The OPA277P supports dual supplies from ±2 V to ±18 V, with absolute maximum rating of ±18 V. Exceeding ±18 V risks permanent damage. The device is fully specified from ±5 V to ±15 V, and maintains key parameters like CMRR and PSRR across this range - making it suitable for both low-voltage portable and high-rail industrial systems. Always observe the 36-V total supply limit (V+ – V–).
Does OPA277P require external bias current cancellation resistors?
No, the OPA277P uses an internally compensated input stage that cancels base current effects, resulting in ±1-nA max input bias current without external components. Adding a bias cancellation resistor (e.g., R1||R2) would degrade offset voltage and increase noise - contrary to standard practice for older op amps. This simplifies layout and improves DC accuracy in high-impedance sensor interfaces.
Can OPA277P drive capacitive loads, and what is the maximum stable value?
Yes, the OPA277P is unity-gain stable and can drive capacitive loads up to 1500 pF without oscillation, as confirmed by small-signal step response testing (Figure 6-22). For loads exceeding 1500 pF, isolation resistance or active compensation is recommended. Stable operation assumes proper power supply decoupling (0.1-µF ceramic capacitors at V+ and V– pins) and minimized trace inductance.
What is the purpose of Pins 1 and 8 on OPA277P, and how are they used?
Pins 1 and 8 are dedicated offset voltage trim terminals, available only on the single-channel OPA277P (not on OPA2277 or OPA4277). They connect to opposite ends of a 20-kΩ potentiometer (wiper to V–) to null residual input offset voltage. This adjustment corrects only the amplifier's intrinsic offset - not system-level errors - and should be performed after thermal stabilization. Leaving both pins unconnected maintains factory-trimmed performance.
How does OPA277P handle input overvoltage conditions?
The OPA277P features robust input protection: 1-kΩ series resistors plus diode clamps to V+ and V– rails enable survival of ±30-V differential input without damage. During overvoltage, clamping diodes conduct, limiting current to safe levels. However, this conduction may disturb slewing in unity-gain followers - so transient overvoltage events should be minimized in high-speed precision circuits. No external protection is required for typical industrial transients.
OPA277P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 0.8V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 790µA
- 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
OPA277P FAQ
1.How can I place an order for OPA277P through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA277P 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 OPA277P reliable?
The price and inventory of OPA277P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA277P is usually 5 days.
3.What payment methods are accepted for OPA277P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA277P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA277P?
OPA277P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA277P 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 OPA277P?
For technical support, including OPA277P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA277P requirements.
6.How does Aetrix verify that OPA277P is sourced from the original manufacturer or authorized distributors?
All OPA277P 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 OPA277P meets industry standards.
7.What is the process for return or replacement of OPA277P?
All OPA277P units undergo pre-shipment inspection (PSI). If there is an issue with OPA277P, 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 OPA277P part is unused and in its original packaging.
Return procedure for OPA277P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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