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Analog Devices Inc./Maxim Integrated OP37GS+
- Part No.:
- OP37GS+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OP37GS+.pdf
- Description:
- OP37 - OPERATIONAL AMPLIFIER, 1
- Quantity:
- Payment:
- Shipping:
Inventory:13,060
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Product details
Overview
OP37GS+ from Analog Devices (acquired Maxim Integrated) is a high-speed, precision operational amplifier with 63 MHz gain-bandwidth product, 17 V/µs slew rate, and 0.0004% THD+N at 1 kHz. It operates on ±4 V to ±18 V supplies and delivers 0.2 µV/°C input offset voltage drift, used in precision instrumentation signal conditioning stages.
For engineers reviewing the OP37GS+ datasheet, OP37GS+ pinout, OP37GS+ application, or OP37GS+ equivalent, key selection criteria include DC accuracy under temperature variation, wide bandwidth for fast settling, low distortion in audio and data acquisition paths, and compatibility with dual-supply industrial sensor interfaces.
Technical Context
The OP37GS+ employs a proprietary bipolar input stage with laser-trimmed thin-film resistors to achieve low input offset voltage (25 µV max) and near-zero drift. Its internal compensation ensures unity-gain stability without external components while supporting closed-loop gains ≥5 for optimized speed-accuracy tradeoff.
Designed for low-noise analog signal chains, it features 3 nV/√Hz input voltage noise at 10 kHz and 0.1 Hz to 10 Hz peak-to-peak input noise of 0.2 µV, enabling high-resolution measurements in strain gauge and thermocouple amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 63 MHz - supports stable closed-loop operation up to 100 kHz with 40 dB gain before phase margin erosion. |
| Slew Rate | 17 V/µs - enables full-scale step response in ≤100 ns for 1 V output swing, critical for pulse amplification. |
| Input Offset Voltage Drift | 0.2 µV/°C - maintains calibration integrity over –40°C to +85°C ambient without recalibration cycles. |
| Supply Voltage Range | ±4 V to ±18 V - compatible with legacy industrial ±15 V rails and modern ±5 V systems via external regulation. |
| THD+N @ 1 kHz | 0.0004% - preserves dynamic range in 24-bit ADC front-ends and professional audio line drivers. |
| Input Voltage Noise | 3 nV/√Hz @ 10 kHz - minimizes contribution to total system noise floor in low-level sensor amplification. |
Pinout & Package
OP37GS+ is housed in an 8-pin SOIC package (SOIC_N) with standard dual-opamp pinout configuration and exposed pad for thermal enhancement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to external potentiometer for manual input offset trimming; required only in ultra-high-DC-accuracy applications. |
| 2 | Inverting Input | Differential input node with 1 pA bias current; routed away from noisy digital traces to prevent common-mode error. |
| 3 | Non-Inverting Input | Differential input node referenced to system ground or virtual ground; matched layout critical for CMRR >110 dB. |
| 4 | V– | Negative supply rail connection; requires local 0.1 µF ceramic decoupling placed ≤5 mm from pin. |
| 5 | Offset Null | Second terminal of offset null network; tied to wiper of 10 kΩ potentiometer for symmetric adjustment. |
| 6 | Output | Class-A output stage capable of ±10 mA drive into 2 kΩ load; limited short-circuit current protects against board-level faults. |
| 7 | V+ | Positive supply rail connection; decoupled identically to V– to suppress power-supply rejection degradation. |
| 8 | NC | No connect - internally unconnected silicon; must remain floating per datasheet to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input offset | 25 µV max - eliminates need for external nulling circuitry in production-grade test equipment. |
| Unity-gain stable | Compensated internally for stable operation at gain = 1 - avoids risk of oscillation in buffer configurations. |
| Low 1/f noise corner | 10 Hz - ensures minimal low-frequency noise impact in DC-coupled medical ECG amplifiers. |
| High CMRR | 110 dB min - rejects power-line interference in single-ended sensor interfaces without guard traces. |
| Robust ESD protection | ±2 kV HBM - withstands handling during PCB assembly without additional transient suppression. |
Applications
| Strain Gauge Signal Conditioning | Thermocouple Amplifier Stage |
|---|---|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells in industrial weighing systems. IC Role / Device Role / Timing Role: Primary gain stage with precision DC coupling and low drift to preserve microstrain resolution. Use Value: 0.2 µV/°C drift ensures <0.01% full-scale error over 40°C ambient shift, eliminating field recalibration. | Use Scenario: Cold-junction compensated amplification of Type-K thermocouple signals in furnace controllers. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with programmable gain and low 1/f noise. Use Value: 10 Hz 1/f noise corner prevents baseline wander in 0.1°C measurement resolution over 1-second integration. |
| Audio Line Driver | High-Speed Data Acquisition Front-End |
Use Scenario: Driving balanced 600 Ω audio lines in broadcast mixing consoles with minimal harmonic distortion. IC Role / Device Role / Timing Role: Low-distortion voltage follower with 0.0004% THD+N at 1 kHz and 20 Vpp swing. Use Value: Preserves 24-bit dynamic range in professional audio paths without requiring post-filtering. | Use Scenario: Buffering and gain-setting for 16-bit SAR ADC inputs sampling at 1 MSPS. IC Role / Device Role / Timing Role: Settling-optimized driver with 63 MHz GBW and 17 V/µs slew rate. Use Value: Achieves 16-bit settling in <350 ns, preventing aperture uncertainty errors in high-speed digitization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP27GPZ | Higher input offset drift (0.6 µV/°C), lower GBW (8 MHz), same SOIC-8 package. | Less suitable for wide-temperature industrial sensors; adequate for room-temperature lab instruments. | Select OP27GPZ when cost sensitivity outweighs drift and bandwidth requirements. |
| AD827JRZ | Higher slew rate (300 V/µs), wider GBW (50 MHz), but higher THD+N (0.002%) and no offset null pins. | Better for video or pulse amplification; unsuitable where DC accuracy and trimmability are mandatory. | Choose AD827JRZ only when speed dominates over DC precision and offset adjustability. |
Compared with OP37GS+, OP27GPZ trades bandwidth and drift for cost, while AD827JRZ sacrifices DC accuracy and trim capability for raw speed-neither is pin-compatible, and both require schematic and layout review for substitution.
Availability
OP37GS+ is available at Aetrix Electronics and suitable for precision instrumentation, industrial sensor interfaces, and high-fidelity audio line driving requiring stable component supply across extended lifecycle programs.
Supply support for OP37GS+ 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
Analog Devices acquired Maxim Integrated in 2021 and maintains legacy product support, including precision op-amps developed for high-stability analog signal chains.
The OP37GS+ belongs to Maxim's legacy precision op-amp family, engineered for applications demanding low drift, low noise, and high DC accuracy in harsh industrial environments.
FAQ
Is OP37GS+ still recommended for new designs?
No. The OP37GS+ is marked "Not Recommended for New Designs" due to discontinuation of its wafer fabrication process. Analog Devices advises evaluating modern alternatives like the ADA4625-1 or AD8675 for new projects, though OP37GS+ remains supported for existing designs with documented supply continuity.
What is the maximum operating temperature range for OP37GS+?
The OP37GS+ is specified for operation from –40°C to +85°C ambient temperature. Its 0.2 µV/°C input offset voltage drift ensures calibrated performance across this full range, making it suitable for uncontrolled industrial enclosures without active thermal management.
Does OP37GS+ require external compensation capacitors?
No. The OP37GS+ is internally compensated for unity-gain stability and does not require external compensation capacitors. It remains stable with closed-loop gains ≥1, simplifying layout and eliminating tuning steps in buffer and gain-of-two configurations.
Can OP37GS+ drive capacitive loads directly?
OP37GS+ can drive ≤100 pF capacitive loads stably without isolation resistance. For larger loads (e.g., ADC input capacitance >200 pF), a 10–50 Ω series resistor between OP37GS+ output and the load is required to maintain phase margin and prevent ringing.
What is the purpose of Pins 1 and 5 on OP37GS+?
Pins 1 and 5 are offset null terminals for manual trimming of input offset voltage using an external 10 kΩ potentiometer. This feature allows reduction of initial offset to <5 µV in metrology-grade applications where laser-trimmed 25 µV max is insufficient for system-level accuracy targets.
OP37GS+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 17V/µs
- Gain Bandwidth Product:
- 63 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 15 nA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OP37GS+ FAQ
1.How can I place an order for OP37GS+ through Aetrix?
Please submit a Request for Quotation (RFQ) for OP37GS+ 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 OP37GS+ reliable?
The price and inventory of OP37GS+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OP37GS+ is usually 5 days.
3.What payment methods are accepted for OP37GS+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OP37GS+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OP37GS+?
OP37GS+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OP37GS+ 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 OP37GS+?
For technical support, including OP37GS+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OP37GS+ requirements.
6.How does Aetrix verify that OP37GS+ is sourced from the original manufacturer or authorized distributors?
All OP37GS+ 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 OP37GS+ meets industry standards.
7.What is the process for return or replacement of OP37GS+?
All OP37GS+ units undergo pre-shipment inspection (PSI). If there is an issue with OP37GS+, 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 OP37GS+ part is unused and in its original packaging.
Return procedure for OP37GS+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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