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Texas Instruments OPA37GU
- Part No.:
- OPA37GU
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA37GU.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:840
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Product details
Overview
OPA37GU from Texas Instruments is a decompensated, ultra-low-noise, high-precision bipolar operational amplifier in SOIC-8 package, featuring 4.5nV/√Hz max 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 DC-coupled signal conditioning in instrumentation-grade analog front-ends.
For engineers reviewing the OPA37GU datasheet, OPA37GU pinout, OPA37GU application, or OPA37GU equivalent, key selection criteria include its decompensated architecture (G ≥ 5), laser-trimmed offset stability, ±40°C to +85°C operating range, and SOIC-8 thermal resistance (θJA = 160°C/W), critical for low-drift, low-noise transducer amplifier designs.
Technical Context
The OPA37GU implements a proprietary bias current cancellation circuit enabling stable input bias and offset current across –40°C to +85°C. Its decompensated internal topology delivers 11.9V/µs slew rate and 63MHz typical gain-bandwidth-optimized for G ≥ 5 closed-loop configurations where bandwidth and settling time outweigh unity-gain stability needs.
Laser-trimmed thin-film resistors provide long-term offset voltage stability (0.4µV/°C max drift) and eliminate zener-zap calibration artifacts. 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-1µVpp signal amplification in 0.1Hz–10Hz bandwidth applications like strain gauge interfaces. |
| Input Offset Voltage | 100µV max - supports 16-bit+ resolution in 10V full-scale data acquisition systems without nulling circuitry. |
| Gain-Bandwidth Product | 45MHz min - allows stable 100kHz closed-loop bandwidth at G = 500, suitable for fast-settling sensor readouts. |
| Slew Rate | 11V/µs min - ensures ≤25µs 0.01% settling for ±10V output steps, critical for pulse-amplifier and synchronous demodulator stages. |
| Common-Mode Rejection | 100dB min - rejects >100,000:1 common-mode interference in bridge-based transducer circuits with unbalanced PCB layouts. |
| Supply Voltage Range | ±4V to ±22V - accommodates industrial ±15V rails and battery-powered ±5V systems while maintaining specified noise and offset performance. |
| Operating Temperature | –40°C to +85°C - qualified for embedded test equipment and field-deployed instrumentation without derating. |
Pinout & Package
OPA37GU 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 AA. Thermal resistance θJA = 160°C/W enables 3.3mA quiescent current operation without forced airflow in compact enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to wiper of 10kΩ potentiometer for manual VOS adjustment; laser-trimming renders this optional in most applications. |
| 2 | Inverting Input (–In) | Differential input node with 2GΩ||2.5pF impedance; sensitive to thermoelectric EMFs-requires symmetrical PCB routing and Kelvin connections. |
| 3 | Non-Inverting Input (+In) | Differential input node matched to Pin 2; input bias current ≤80nA max enables high-Z sensor interfacing with minimal loading error. |
| 4 | –VCC | Negative supply rail; must be decoupled with ≥0.1µF ceramic capacitor placed within 5mm of Pin 4 to suppress high-frequency oscillation. |
| 5 | Offset Trim (+) | Connects to one end of trim potentiometer; unused pins (5 and 8) are NC and must remain unconnected per datasheet. |
| 6 | Output | Capable of ±12.8V into 600Ω; short-circuit current limited to 60mA-supports direct driving of 1kΩ loads without external current limiting. |
| 7 | +VCC | Positive supply rail; shares same decoupling requirements as Pin 4; total supply current 3.3–5.7mA varies linearly with supply voltage. |
| 8 | NC | No connection; electrically isolated-must not be tied to ground, supply, or any other net to avoid parasitic coupling or ESD path disruption. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1/f noise | 0.25µVPP (0.1Hz–10Hz) enables microvolt-level DC measurements in weigh scales and medical bio-potential amplifiers. |
| Laser-trimmed offset | ±25µV typical offset with ±0.4µV/°C drift-eliminates warm-up drift penalties seen in zener-zap trimmed op-amps like OP-07. |
| High open-loop gain | 117dB min ensures <0.001% gain error in G = 1000 instrumentation amplifier topologies using external precision resistors. |
| Decompensated architecture | Stable only at G ≥ 5-reduces internal compensation capacitance, yielding 10× higher GBW than OPA27 for high-speed precision filtering. |
| Back-to-back input diodes | Enables ±0.7V differential input tolerance without series resistors-preserves 0.4pA/√Hz current noise for low-source-impedance sensors. |
Applications
| Precision Instrumentation | Data Acquisition |
|---|---|
Use Scenario: Amplifying µV-level outputs from load cells and pressure bridges in automated test systems. IC Role / Device Role / Timing Role: Primary gain stage in ratiometric measurement chains with 24-bit sigma-delta ADCs. Use Value: 4.5nV/√Hz noise floor and 100µV offset enable 1:1,000,000 dynamic range without chopper stabilization. |
Use Scenario: Front-end conditioning for multi-channel industrial DAQ modules sampling at 100kSPS. IC Role / Device Role / Timing Role: Anti-aliasing filter driver and programmable-gain amplifier before SAR ADCs. Use Value: 45MHz GBW and 11V/µs slew rate support 100kHz full-power bandwidth with <25µs 0.01% settling. |
| Test Equipment | Professional Audio Equipment |
Use Scenario: Low-distortion signal generation and measurement in benchtop oscilloscopes and function generators. IC Role / Device Role / Timing Role: Output buffer and active filter component in calibrated reference sources. Use Value: 122dB CMRR and 94dB PSRR reject power supply ripple and ground bounce in mixed-signal PCBs. |
Use Scenario: Microphone preamplifier and line-driver stage in studio-grade audio interfaces. IC Role / Device Role / Timing Role: First-stage gain block for condenser mics with 48V phantom power. Use Value: 0.25µVPP 0.1Hz–10Hz noise ensures no audible hiss in 115dB SPL recording paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA27GU | Unity-gain stable; 5MHz GBW; 1.9V/µs slew rate; identical SOIC-8 package and pinout. | Better suited for G = 1 buffers and low-bandwidth integrators where stability at unity gain is mandatory. | Select OPA27GU when closed-loop gain < 5 is required or when lower power consumption (3.3mA vs 5.7mA) is prioritized over speed. |
| AD797ARZ | FET-input; 1nV/√Hz noise; 110MHz GBW; SOIC-8; requires external compensation for G < 10. | Superior voltage noise for high-source-impedance sensors (>10kΩ); higher cost and tighter layout sensitivity. | Choose AD797ARZ for ultra-low-noise photodiode transimpedance amps where current noise dominates, not voltage noise. |
Compared with OPA27GU and AD797ARZ, the OPA37GU uniquely balances decompensated speed (45MHz GBW), bipolar low-voltage-noise (4.5nV/√Hz), and laser-trimmed DC precision-making it optimal for G ≥ 5, medium-source-impedance (<5kΩ), wideband precision amplification where unity-gain stability is unnecessary.
Availability
OPA37GU is available at Aetrix Electronics and suitable for precision instrumentation, data acquisition, and test equipment requiring stable component supply with guaranteed long-term manufacturability and TI's standard 10-year product longevity commitment.
Supply support for OPA37GU 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 OPA37GU belongs to TI's OPAx37 family of decompensated precision op-amps engineered for high-speed, low-noise, DC-accurate signal conditioning in test & measurement, industrial automation, and medical instrumentation.
FAQ
What is the minimum stable closed-loop gain for OPA37GU?
The OPA37GU is decompensated and requires a minimum closed-loop gain of 5 for stable operation. Attempting unity-gain or G = 2 configurations will cause peaking or oscillation due to insufficient phase margin. This is explicitly defined in the datasheet's "DESCRIPTION" section and confirmed by the "COMPENSATION" application note on page 10.
Does OPA37GU require external offset nulling in precision applications?
No-OPA37GU features laser-trimmed thin-film resistors that achieve ±100µV max input offset voltage and ±0.4µV/°C max drift without external trimming. The offset trim pins (1 and 5) are provided for system-level nulling only; using them degrades drift performance and is unnecessary for most applications per the "OFFSET VOLTAGE ADJUSTMENT" section.
Can OPA37GU replace OP-37 or AD517 in existing designs?
Yes-the datasheet explicitly states "FITS OP-07, OP-05, AD510, AND AD517" and identifies OPA37 as an improved replacement for OP-37. Pin compatibility is confirmed: all share SOIC-8/DIP-8 footprints and identical pin 1–8 functions. However, verify closed-loop gain ≥ 5 and update compensation if replacing unity-gain-stable predecessors.
What is the maximum allowable differential input voltage for OPA37GU?
The absolute maximum differential input voltage for OPA37GU is ±0.7V, as stated in the "ABSOLUTE MAXIMUM RATINGS" table. Exceeding this forward-biases the internal back-to-back protection diodes, risking irreversible damage unless external current limiting is applied-per Note 4 and the "INPUT PROTECTION" section on page 10.
How does OPA37GU's noise performance compare to OPA27GU at 1kHz?
At 1kHz, OPA37GU specifies 4.5nV/√Hz max input voltage noise, identical to OPA27GU's 4.5nV/√Hz max. Both share the same core low-noise bipolar process and laser-trimmed architecture-differences lie in compensation (decompensated vs unity-gain stable) and bandwidth, not fundamental noise floor.
OPA37GU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for OPA37GU through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA37GU 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 reliable?
The price and inventory of OPA37GU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA37GU is usually 5 days.
3.What payment methods are accepted for OPA37GU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA37GU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA37GU?
OPA37GU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA37GU 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?
For technical support, including OPA37GU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA37GU requirements.
6.How does Aetrix verify that OPA37GU is sourced from the original manufacturer or authorized distributors?
All OPA37GU 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 meets industry standards.
7.What is the process for return or replacement of OPA37GU?
All OPA37GU units undergo pre-shipment inspection (PSI). If there is an issue with OPA37GU, 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 part is unused and in its original packaging.
Return procedure for OPA37GU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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