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Texas Instruments OPA37GU/2K5
- Part No.:
- OPA37GU/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA37GU/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,319
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Product details
Overview
OPA37GU/2K5 from Texas Instruments is a decompensated, ultra-low-noise, high-precision bipolar operational amplifier in SOIC-8 package, featuring 4.5nV/√Hz input voltage noise at 1kHz, 100µV max input offset voltage, and 45MHz gain-bandwidth product. It requires minimum closed-loop gain of 5 and targets precision analog signal conditioning in instrumentation-grade circuits.
For engineers reviewing the OPA37GU/2K5 datasheet, OPA37GU/2K5 pinout, OPA37GU/2K5 application, or OPA37GU/2K5 equivalent, key selection criteria include its decompensated stability requirement (G ≥ 5), low-drift laser-trimmed architecture, radiation-hardened suitability, and direct replacement capability for OP-37 and AD517 in high-fidelity transducer interfaces.
Technical Context
The OPA37GU/2K5 implements a proprietary bias current cancellation circuit enabling stable input bias and offset current over –40°C to +85°C. Its decompensated architecture delivers 11.9V/µs slew rate and 63MHz typical gain-bandwidth-significantly higher than unity-gain-stable OPA27-while maintaining 0.4µV/°C max offset drift and 100dB min CMRR.
Laser-trimmed thin-film resistors provide long-term offset stability (0.4µV/month) and eliminate zener-zap drift mechanisms. Input protection uses back-to-back diodes without series current-limiting resistors-preserving low-noise performance but requiring external differential voltage limiting if inputs exceed ±0.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 4.5nV/√Hz max at 1kHz - enables sub-µV signal amplification in low-source-impedance sensor front-ends |
| Input Offset Voltage | 100µV max - supports DC-coupled precision measurement without nulling in most applications |
| Offset Drift | 0.4µV/°C max - ensures <1µV total drift across full industrial temperature range (–40°C to +85°C) |
| Gain-Bandwidth Product | 45MHz min - allows stable operation at G = 5 with >5MHz closed-loop bandwidth |
| Slew Rate | 11V/µs min - supports fast settling of 10V step signals within 25µs at 0.01% accuracy |
| Common-Mode Rejection | 100dB min - rejects >100,000:1 of power-supply or ground-noise common-mode interference |
| Supply Voltage Range | ±4V to ±22V - accommodates wide rail flexibility while maintaining specified noise and linearity |
Pinout & Package
OPA37GU/2K5 is housed in an 8-pin SOIC (D) package with 1.27mm pitch, 3.9mm width, and 1.75mm max height per JEDEC MS-012 variation AA. Thermal resistance θJA = 160°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim | Connects to wiper of 10kΩ potentiometer for fine VOS adjustment; drift degradation minimized when using 10kΩ trimmer |
| 2 | Inverting Input (–In) | Differential input node; protected by back-to-back diodes-requires external current limiting if differential voltage exceeds ±0.7V |
| 3 | Non-Inverting Input (+In) | Differential input node; same protection scheme as Pin 2; critical for thermoelectric error minimization via symmetric PCB layout |
| 4 | –VCC | Negative supply rail connection; must be decoupled locally with 0.1µF ceramic capacitor to minimize PSRR degradation |
| 5 | Offset Trim | Second trim terminal; used with Pin 1 to form adjustable voltage divider across internal offset correction network |
| 6 | Output | Class-A output stage capable of ±12.8V swing into 600Ω; short-circuit current limited to 60mA max |
| 7 | +VCC | Positive supply rail connection; same decoupling requirement as Pin 4; supplies quiescent current of 3.3–5.7mA |
| 8 | NC | No internal connection; electrically isolated-must remain unconnected to avoid parasitic coupling or EMI pickup |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | Enables 0.4µV/°C max offset drift and 0.4µV/month long-term stability-superior to zener-zap trimming |
| Bias current cancellation circuit | Maintains ±80nA max input bias current over full –40°C to +85°C range-critical for high-Z sensor interfacing |
| Decompensated architecture | Delivers 45MHz GBW and 11V/µs slew rate at G ≥ 5-enables high-speed precision filtering and active compensation |
| Back-to-back input diode protection | Preserves 4.5nV/√Hz noise floor by omitting series current-limiting resistors-requires careful external voltage clamping |
| Radiation-hardened design | Qualified for use in radiation environments per datasheet Applications section-supports nuclear instrumentation and space-qualified subsystems |
Applications
| Precision Instrumentation | Data Acquisition |
|---|---|
Use Scenario: Amplifying microvolt-level outputs from strain gauges and load cells in automated test equipment. IC Role / Device Role / Timing Role: Primary low-noise, low-drift gain stage in DC-coupled signal chain before ADC sampling. Use Value: 4.5nV/√Hz noise and 0.4µV/°C drift ensure <1µV total error contribution across temperature-enabling 24-bit effective resolution. |
Use Scenario: Front-end conditioning for 16-bit+ SAR ADCs in modular data loggers monitoring environmental sensors. IC Role / Device Role / Timing Role: Programmable-gain amplifier (PGA) driver with matched input impedance and minimal settling time. Use Value: 25µs 0.01% settling time and 100dB CMRR reject ground bounce and supply ripple-preserving ENOB under dynamic load conditions. |
| Professional Audio Equipment | Transducer Amplifiers |
Use Scenario: Phono preamplifier stage for moving-magnet cartridges requiring RIAA equalization and ultra-low noise. IC Role / Device Role / Timing Role: First-stage low-noise voltage amplifier with precise passive EQ network interface. Use Value: 4.5nV/√Hz noise at 1kHz dominates system noise floor below 10kHz-meeting THD+N <0.001% in high-fidelity designs. |
Use Scenario: Hydrophone and piezoelectric sensor signal conditioning in underwater acoustic monitoring systems. IC Role / Device Role / Timing Role: High-input-impedance charge-to-voltage converter with guarded input traces. Use Value: Laser-trimmed offset and bias current cancellation prevent thermal EMF-induced baseline wander-critical for sub-Hz seismic signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA27GU/2K5 | Unity-gain stable; 5MHz GBW; 1.9V/µs slew rate; higher input bias current (±80nA vs ±150nA) | Preferred for G = 1 buffer, low-power DAQ, and applications requiring unconditional stability without gain constraints | Select OPA27GU/2K5 when closed-loop gain < 5 is required or when lower bandwidth suffices for improved PSRR and noise efficiency |
| AD517JN | Higher input offset (250µV max); wider supply range (±20V); no laser trimming; 10MHz GBW | Legacy industrial control systems where long-term drift tolerance >1µV/°C is acceptable | Choose AD517JN only for cost-sensitive retrofits where OPA37GU/2K5's laser-trimmed stability and noise are not mandatory |
Compared with OPA27GU/2K5, the OPA37GU/2K5 trades unconditional stability for 9× higher bandwidth and 6× faster slew rate-making it optimal for G ≥ 5 active filters and high-speed precision buffers. Against AD517JN, it delivers 2.5× lower noise, 2.5× better drift, and guaranteed laser-trimmed performance-justifying upgrade in new designs demanding metrology-grade accuracy.
Availability
OPA37GU/2K5 is available at Aetrix Electronics and suitable for precision instrumentation, professional audio equipment, and transducer amplifier applications requiring stable component supply, long-lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for OPA37GU/2K5 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 innovation and industrial-grade reliability.
The OPA37GU/2K5 belongs to TI's OPAx37 family of decompensated precision op-amps, engineered specifically for high-speed, low-noise signal conditioning in test & measurement, medical instrumentation, and aerospace-grade sensor interfaces.
FAQ
What is the minimum closed-loop gain required for stable operation of the OPA37GU/2K5?
The OPA37GU/2K5 is decompensated and requires a minimum closed-loop gain of 5 for stable operation. Attempting unity-gain or G = 2 configurations may cause peaking or oscillation due to insufficient phase margin. This is explicitly defined in the datasheet's DESCRIPTION section and confirmed in Electrical Characteristics tables under Frequency Response.
Does the OPA37GU/2K5 require external offset nulling in typical applications?
No-OPA37GU/2K5 features laser-trimmed thin-film resistors that achieve ≤100µV input offset voltage without external nulling. The datasheet states "offset voltages are laser-trimmed and require no further trim for most applications." Nulling is only recommended for systems demanding sub-10µV residual offset, and even then, a 10kΩ potentiometer preserves optimal drift performance.
How does the input protection scheme of the OPA37GU/2K5 affect circuit design?
The OPA37GU/2K5 uses back-to-back diodes without series current-limiting resistors to preserve its 4.5nV/√Hz noise performance. However, this means differential input voltages exceeding ±0.7V will forward-bias the diodes and draw excessive current. Designers must add external 1kΩ–10kΩ series resistors on both inputs when interfacing with signals prone to overvoltage transients or ESD events.
Can the OPA37GU/2K5 replace OP-37 or AD517 in existing designs without modification?
Yes-the OPA37GU/2K5 is explicitly positioned as an improved replacement for OP-37 and AD517, with identical SOIC-8 pinout, compatible supply ranges (±4V to ±22V), and enhanced specs including lower noise (4.5nV/√Hz vs 12nV/√Hz for OP-37), lower drift (0.4µV/°C vs 1.0µV/°C), and higher GBW (45MHz vs 12MHz). No PCB changes are needed for drop-in substitution.
What thermal considerations apply to the OPA37GU/2K5 in continuous operation?
The OPA37GU/2K5 has a junction-to-ambient thermal resistance (θJA) of 160°C/W in SOIC-8 package. At maximum quiescent current (5.7mA) and ±15V supply, power dissipation reaches ~171mW, resulting in ~27°C junction-to-ambient rise above ambient. For reliable operation at +85°C ambient, board layout must include adequate copper pour and airflow to keep junction temperature below 125°C absolute maximum.
OPA37GU/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 11.9V/µs
- Gain Bandwidth Product:
- 63 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
OPA37GU/2K5 FAQ
1.How can I place an order for OPA37GU/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA37GU/2K5 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 OPA37GU/2K5 reliable?
The price and inventory of OPA37GU/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA37GU/2K5 is usually 5 days.
3.What payment methods are accepted for OPA37GU/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA37GU/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA37GU/2K5?
OPA37GU/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA37GU/2K5 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 OPA37GU/2K5?
For technical support, including OPA37GU/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA37GU/2K5 requirements.
6.How does Aetrix verify that OPA37GU/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA37GU/2K5 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 OPA37GU/2K5 meets industry standards.
7.What is the process for return or replacement of OPA37GU/2K5?
All OPA37GU/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA37GU/2K5, 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 OPA37GU/2K5 part is unused and in its original packaging.
Return procedure for OPA37GU/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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