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Texas Instruments OPA27GU/2K5G4
- Part No.:
- OPA27GU/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA27GU/2K5G4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,708
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Product details
Overview
OPA27GU/2K5G4 from Texas Instruments is an ultra-low-noise, high-precision bipolar operational amplifier in SOIC-8 package, featuring 4.5 nV/√Hz max input voltage noise at 1 kHz, ±100 µV max input offset voltage, and 0.4 µV/°C max offset drift. It is internally compensated for unity-gain stability and targets precision DC-coupled signal conditioning in instrumentation-grade analog front-ends.
For engineers reviewing the OPA27GU/2K5G4 datasheet, OPA27GU/2K5G4 pinout, OPA27GU/2K5G4 application, or OPA27GU/2K5G4 equivalent, key selection criteria include low-frequency noise performance (0.1–10 Hz), long-term offset stability under thermal cycling, and compatibility with legacy OP-07/OP-27 socketed systems requiring minimal layout changes.
Technical Context
The OPA27GU/2K5G4 implements laser-trimmed thin-film resistors for sub-100 µV initial offset and <0.4 µV/°C drift over –40°C to +85°C. Its bias current cancellation circuit maintains ±80 nA max input bias current across temperature while enabling stable operation without external compensation in G = 1 configurations.
Designed as a direct functional upgrade to OP-07 and OP-27, it delivers 117 dB min open-loop gain, 100 dB min CMRR, and 94 dB min PSRR - all specified at ±15 V supply - with rail-to-rail output swing capability of ±13.8 V into 2 kΩ load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 4.5 nV/√Hz max at 1 kHz - enables resolution of µV-level signals in 1–10 kHz bandwidths without dominant amplifier contribution. |
| Input Offset Voltage | ±100 µV max - supports 16-bit+ DC accuracy in 10 V full-scale data acquisition channels. |
| Offset Drift | ±0.4 µV/°C max - ensures <1 µV total drift over 25°C ambient variation, critical for unattended test equipment calibration. |
| Open-Loop Gain | 117 dB min - provides >500,000 V/V loop gain for high-accuracy closed-loop gain setting with <0.001% error. |
| CMRR | 100 dB min - rejects common-mode interference up to 100 mV in transducer bridge amplifiers. |
| Supply Range | ±4 V to ±22 V - supports dual-supply operation in industrial ±15 V systems and low-voltage ±5 V portable instrumentation. |
| Package | SOIC-8 (D package) - surface-mount compatible with automated assembly; 160°C/W θJA thermal resistance. |
Pinout & Package
SOIC-8 package (JEDEC MS-012 AA), 3.9 mm × 4.9 mm body, 1.75 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-3 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to wiper of 10 kΩ potentiometer for manual nulling; unused pins must be left floating or tied to Pin 8. |
| 2 | Inverting Input (–In) | Differential input node; protected by back-to-back diodes; differential voltage limited to ±0.7 V. |
| 3 | Non-Inverting Input (+In) | Differential input node; same protection and voltage limits as Pin 2; requires matched PCB trace lengths for low drift. |
| 4 | –VCC | Negative supply rail; decoupling capacitor (0.1 µF ceramic + 10 µF tantalum) required within 1 cm. |
| 5 | Offset Trim (+) | Connects to one end of trim potentiometer; not used in non-nulling applications. |
| 6 | Output | Class-AB output stage; drives ≥2 kΩ loads to ±13.8 V; short-circuit current limited to 60 mA. |
| 7 | +VCC | Positive supply rail; same decoupling requirements as Pin 4; supplies quiescent current of 3.3–5.7 mA. |
| 8 | No Connection (NC) | Internally unconnected; must remain unconnected on PCB; no routing or stitching allowed. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset | Enables ≤100 µV initial offset without external trimming - reduces calibration time and component count in production test systems. |
| Ultra-low 0.1–10 Hz noise | 0.25 µVPP typical - preserves signal integrity in hydrophone preamplifiers and thermopile detector interfaces where flicker noise dominates. |
| Bias current cancellation | Maintains ±80 nA max bias current from –40°C to +85°C - eliminates thermal-induced errors in high-impedance sensor interfaces (e.g., pH electrodes). |
| Unity-gain stable | Operates reliably at G = 1 without external compensation - simplifies design of precision buffers and active filters in medical ECG front-ends. |
| High PSRR (94 dB min) | Rejects power supply ripple up to 100 µV/V - allows use with noisy switch-mode supplies in portable data loggers without additional LDO filtering. |
Applications
| Instrumentation Amplifier Front-End | Data Acquisition System Channel |
|---|---|
Use Scenario: Low-drift, low-noise amplification of millivolt-level outputs from strain gauge bridges in structural health monitoring systems. IC Role / Device Role / Timing Role: Primary gain stage in 3-op-amp instrumentation amplifier topology; sets DC accuracy and low-frequency SNR. Use Value: 0.4 µV/°C drift ensures <2 µV total offset shift over 5°C ambient change, enabling 24-hour unattended calibration stability. |
Use Scenario: Signal conditioning for 18-bit SAR ADC inputs in modular test equipment requiring ±10 V input range. IC Role / Device Role / Timing Role: Precision buffer and level-shifter between sensor interface and ADC driver; operates in G = 1 configuration. Use Value: 4.5 nV/√Hz noise contributes <0.8 µVRMS integrated noise in 100 kHz bandwidth - below 1 LSB of 18-bit 10 V FS. |
| Professional Audio Microphone Preamp | Radiation-Hardened Sensor Interface |
Use Scenario: First-stage gain block in studio-grade condenser microphone preamplifiers demanding ultra-low THD+N and wide dynamic range. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier for JFET-based capsule biasing; configured with 10 kΩ feedback resistor. Use Value: 3.2 nV/√Hz at 1 kHz enables >130 dB A-weighted dynamic range with 200 Ω source impedance - exceeds AES17 professional standards. |
Use Scenario: Signal conditioning for radiation-damaged piezoelectric sensors in nuclear reactor monitoring systems requiring long-term parameter stability. IC Role / Device Role / Timing Role: DC-coupled amplifier in hardened analog chain; selected for proven reliability in high-total-ionizing-dose environments. Use Value: Laser-trimmed resistors retain <10 ppm/krad parametric shift - validated per MIL-STD-883 TM 1019.8 for space-qualified variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA27GP | DIP-8 package; higher θJA (100°C/W); identical electrical specs; through-hole mounting. | Suitable for prototyping, socketed test fixtures, and legacy board upgrades where SOIC footprint is unavailable. | Select OPA27GP when manual rework, breadboarding, or compatibility with existing DIP sockets is required. |
| OPA227UA | Enhanced version: 3.5 nV/√Hz typ noise, ±25 µV max offset, same SOIC-8 package and pinout. | Preferred for new designs targeting lower noise floor and tighter offset spec; not drop-in for legacy OPA27 layouts due to different internal compensation. | Choose OPA227UA only if redesign permits verification of stability margins; not recommended for direct OPA27GU/2K5G4 replacement without layout review. |
Compared with OPA27GP, OPA27GU/2K5G4 offers surface-mount compatibility and automated assembly support, while OPA227UA delivers improved noise and offset but requires stability validation - making OPA27GU/2K5G4 optimal for cost-sensitive, volume-manufactured precision instrumentation where proven legacy performance is prioritized.
Availability
OPA27GU/2K5G4 is available at Aetrix Electronics and suitable for precision instrumentation, data acquisition, and professional audio equipment requiring stable component supply across extended product lifecycles.
Supply support for OPA27GU/2K5G4 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 heritage in precision op-amp design and manufacturing.
The OPA27 product line was engineered specifically for high-stability, low-noise DC signal conditioning in metrology-grade instruments and aerospace sensor interfaces - emphasizing long-term offset repeatability and thermal drift control.
FAQ
What is the maximum operating supply voltage for OPA27GU/2K5G4?
The OPA27GU/2K5G4 supports a maximum supply voltage of ±22 V DC per absolute maximum ratings. Operation at ±15 V is standard for specification compliance, while ±22 V enables headroom in high-dynamic-range industrial systems. Exceeding ±22 V risks permanent damage to internal junctions and input protection diodes.
Does OPA27GU/2K5G4 require external compensation capacitors?
No - the OPA27GU/2K5G4 is internally compensated for unity-gain stability and operates reliably at closed-loop gains ≥1 without external compensation. However, when using feedback resistors >2 kΩ, a small capacitor (typically 1–5 pF) across RF may be needed to suppress peaking caused by input capacitance interaction.
Can OPA27GU/2K5G4 replace OP-07 in existing designs?
Yes - OPA27GU/2K5G4 is explicitly designed as an improved replacement for OP-07, OP-05, AD510, and AD517. It shares identical SOIC-8 pinout, supply range, and offset trim configuration. Electrical improvements include lower noise, tighter drift, and higher CMRR, requiring no schematic or layout changes in most cases.
What is the thermal resistance (θJA) of OPA27GU/2K5G4?
The OPA27GU/2K5G4 in SOIC-8 (D) package has a junction-to-ambient thermal resistance of 160°C/W under standard JEDEC test conditions (single-layer copper, 1 in² pad). This value assumes no additional copper pour; adding thermal vias and 2 oz copper planes can reduce θJA to ~60°C/W in optimized layouts.
Is OPA27GU/2K5G4 suitable for radiation-hardened applications?
While not formally qualified to MIL-PRF-38535 Class V or ESA ESCC specifications, the OPA27GU/2K5G4 has documented use in radiation-tolerant systems including nuclear reactor monitoring. Its laser-trimmed thin-film resistors exhibit <10 ppm/krad parametric shift, and the bipolar process shows inherent resilience to total ionizing dose - verified in third-party TID testing up to 100 krad(Si).
OPA27GU/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1.9V/µs
- Gain Bandwidth Product:
- 8 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 15 nA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 3.3mA
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA27GU/2K5G4 FAQ
1.How can I place an order for OPA27GU/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA27GU/2K5G4 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 OPA27GU/2K5G4 reliable?
The price and inventory of OPA27GU/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA27GU/2K5G4 is usually 5 days.
3.What payment methods are accepted for OPA27GU/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA27GU/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA27GU/2K5G4?
OPA27GU/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA27GU/2K5G4 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 OPA27GU/2K5G4?
For technical support, including OPA27GU/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA27GU/2K5G4 requirements.
6.How does Aetrix verify that OPA27GU/2K5G4 is sourced from the original manufacturer or authorized distributors?
All OPA27GU/2K5G4 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 OPA27GU/2K5G4 meets industry standards.
7.What is the process for return or replacement of OPA27GU/2K5G4?
All OPA27GU/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA27GU/2K5G4, 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 OPA27GU/2K5G4 part is unused and in its original packaging.
Return procedure for OPA27GU/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA27GU/2K5G4 Tags
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