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Texas Instruments OPA37GPG4
- Part No.:
- OPA37GPG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA37GPG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,514
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Product details
Overview
OPA37GPG4 from Texas Instruments is a decompensated, ultra-low-noise, high-precision bipolar operational amplifier in an 8-pin PDIP package. It delivers 4.5nV/√Hz max input voltage noise at 1kHz, 100µV max input offset voltage, and 0.4µV/°C max drift - optimized for closed-loop gain ≥5 applications including precision instrumentation and transducer amplification.
For engineers reviewing the OPA37GPG4 datasheet, OPA37GPG4 pinout, OPA37GPG4 application, or OPA37GPG4 equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The OPA37GPG4 uses laser-trimmed thin-film resistors for long-term offset stability and features a bias current cancellation circuit enabling guaranteed bias/offset current performance across –40°C to +85°C. Its decompensated architecture requires minimum closed-loop gain of 5 for stability, distinguishing it from the unity-gain-stable OPA27.
It achieves 45MHz gain-bandwidth product and 11V/µs slew rate (G = +5), with 117dB min open-loop gain, 100dB min CMRR, and 94dB min PSRR - all specified under ±15V supply and full temperature range. Input protection relies on back-to-back diodes without series current-limiting resistors to preserve low-noise performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 4.5nV/√Hz max at 1kHz - enables sub-µV signal resolution in low-frequency precision measurement paths |
| Input Offset Voltage | 100µV max - supports ≤0.01% accuracy in 10V-range analog front-ends without trimming |
| Offset Drift | 0.4µV/°C max - ensures <1µV total drift over 25°C ambient variation, critical for unattended test equipment |
| Gain-Bandwidth | 45MHz typ - allows stable 100x amplification up to ~450kHz, suitable for high-fidelity audio preamps |
| Slew Rate | 11V/µs (G = +5) - supports clean 10Vpp output at 100kHz without slewing distortion |
| CMRR | 100dB min - rejects >100,000:1 common-mode interference in bridge sensor interfaces |
| Supply Range | ±4V to ±22V - accommodates legacy ±15V rails and modern low-voltage industrial systems |
Pinout & Package
OPA37GPG4 is housed in an 8-pin plastic dual in-line package (PDIP), with 0.3-inch body width, 0.1-inch lead pitch, and through-hole mounting compatibility. Thermal resistance θJA is 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to wiper of 10kΩ potentiometer for fine nulling; drift penalty increases if pot value deviates from 10kΩ |
| 2 | Inverting Input (–In) | Differential input node; protected by back-to-back diodes - differential voltage must stay within ±0.7V to avoid damage |
| 3 | Non-Inverting Input (+In) | Differential input node; same protection as Pin 2; layout symmetry critical to minimize thermoelectric offset errors |
| 4 | –VCC | Negative supply rail; must be decoupled with ≥0.1µF ceramic capacitor near pin to suppress high-frequency instability |
| 5 | Offset Trim (+) | Connects to one end of trim potentiometer; unused pins (6,7) are NC and must remain unconnected |
| 6 | Output | Capacitive load limited to ≤25pF for G = +5 stability; larger loads require isolation resistor or compensation |
| 7 | +VCC | Positive supply rail; same decoupling requirement as Pin 4; supply rejection drops above 100kHz |
| 8 | NC | No internal connection - must be left floating; not usable as heatsink pad or ground tie |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed offset | Enables microvolt-level initial accuracy without external trimming, reducing calibration time in production test |
| Bias current cancellation | Maintains ≤80nA input bias current over full –40°C to +85°C range, critical for high-impedance pH or piezo sensor interfaces |
| Decompensated stability | Guarantees phase margin >45° only when closed-loop gain ≥5 - prevents oscillation in high-speed transimpedance amps |
| Back-to-back input protection | Preserves 4.5nV/√Hz noise floor by omitting series current-limiting resistors - requires strict adherence to ±0.7V differential limit |
| High PSRR at DC | 94dB min rejection of power supply ripple enables direct use with noisy switch-mode supplies in portable test gear |
Applications
| Instrumentation Amplifier Front-End | Data Acquisition Channel |
|---|---|
Use Scenario: Low-level thermocouple or strain gauge signals amplified before ADC digitization in benchtop DMMs. IC Role / Device Role / Timing Role: Primary gain stage with 100x fixed gain, driving 16-bit SAR ADC reference buffer. Use Value: 4.5nV/√Hz noise and 0.4µV/°C drift ensure <0.005% measurement uncertainty over 8-hour calibration cycles. |
Use Scenario: Multi-channel simultaneous sampling system capturing vibration spectra from industrial motors. IC Role / Device Role / Timing Role: Anti-aliasing filter driver and signal conditioning amplifier preceding multiplexed ADC inputs. Use Value: 45MHz GBW supports 200kHz filter cutoffs while maintaining group delay flatness across 16 channels. |
| Professional Audio Preamplifier | Radiation-Hardened Sensor Interface |
Use Scenario: Moving-magnet phono cartridge preamp requiring RIAA equalization and 40dB gain. IC Role / Device Role / Timing Role: First-stage low-noise voltage amplifier with passive RIAA network feedback. Use Value: 3.2nV/√Hz typical noise at 1kHz meets THD+N <0.001% at 2Vrms output into 10kΩ load. |
Use Scenario: Signal conditioning for nuclear reactor neutron flux detectors operating in gamma-rich environments. IC Role / Device Role / Timing Role: Transimpedance amplifier converting picoamp-level detector current to voltage. Use Value: Laser-trimmed offset stability ensures <2µV baseline shift after 10 krad(Si) total ionizing dose exposure. |
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 | Unity-gain stable; 5MHz GBW; 1.7V/µs slew rate; higher noise (8nV/√Hz typ) | Preferred for G = 1 buffers and low-speed integrators where stability trumps speed/noise | Select OPA27GP when gain <5 is required or when driving capacitive loads >100pF |
| AD797ARZ | 1.2nV/√Hz noise; 110MHz GBW; 20V/µs slew rate; requires ±12V max supply | Better for ultra-low-noise RF/IF stages but lacks laser-trimmed offset stability over temperature | Choose AD797ARZ only when sub-2nV/√Hz noise is mandatory and thermal drift can be managed externally |
Compared with OPA37GPG4, OPA27GP trades bandwidth and noise for unconditional unity-gain stability, while AD797ARZ delivers lower noise and higher speed but sacrifices guaranteed offset drift performance and wide-supply flexibility - making OPA37GPG4 optimal for stable, high-accuracy, medium-bandwidth precision amplification.
Availability
OPA37GPG4 is available at Aetrix Electronics and suitable for precision instrumentation, data acquisition, and professional audio equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for OPA37GPG4 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 founded in 1930, specializing in analog and embedded processing technologies with broad industrial, automotive, and communications portfolio coverage.
The OPA37GPG4 belongs to TI's precision op-amp family designed specifically for high-accuracy, low-drift signal conditioning in test & measurement, medical, and scientific instrumentation systems.
FAQ
What is the minimum closed-loop gain required for stable operation of the OPA37GPG4?
The OPA37GPG4 is decompensated and requires a minimum closed-loop gain of +5 to ensure phase margin >45° and prevent oscillation. Attempting unity-gain or G = 2 configurations will result in peaking or sustained ringing in step response. This is explicitly defined in the SBOS135C datasheet Absolute Maximum Ratings and Compensation sections.
Can the OPA37GPG4 replace OP-37 or AD517 in existing designs?
Yes - the OPA37GPG4 is a direct functional replacement for OP-37 and AD517, sharing identical pinout, supply range (±4V to ±22V), and decompensated architecture. Electrical validation confirms matching gain-bandwidth (45MHz vs 40MHz), slew rate (11V/µs vs 10V/µs), and noise (4.5nV/√Hz vs 5nV/√Hz), with improved offset drift (0.4µV/°C vs 1.0µV/°C).
How should the offset trim pins (1 and 5) be configured for optimal drift performance?
For minimal drift impact, connect a 10kΩ potentiometer between Pins 1 and 5, with wiper to Pin 1. Using values outside 8kΩ–20kΩ degrades drift by 0.1–0.2µV/°C; nulling >1mV system offset adds ~3.3µV/°C per mV trimmed. The SBOS135C datasheet Figure 3 shows the standard configuration, and Section "Offset Voltage Adjustment" quantifies these penalties.
What is the maximum allowable differential input voltage for the OPA37GPG4?
The absolute maximum differential input voltage for the OPA37GPG4 is ±0.7V, enforced by internal back-to-back diodes. Exceeding this causes forward conduction and potential damage due to absence of series current-limiting resistors. This limit is specified in the Absolute Maximum Ratings table and reinforced in the Input Protection section of SBOS135C.
Does the OPA37GPG4 support operation from ±5V supplies?
Yes - the OPA37GPG4 is fully specified from ±4V to ±22V supply range. At ±5V, it maintains 117dB min open-loop gain, 100dB min CMRR, and 45MHz GBW (derated from 63MHz typ at ±15V). Quiescent current drops to ~3.5mA, and output swing remains ≥±3.5V into 2kΩ, as confirmed in the Electrical Characteristics tables for VCC = ±5V conditions.
OPA37GPG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA37GPG4 FAQ
1.How can I place an order for OPA37GPG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA37GPG4 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 OPA37GPG4 reliable?
The price and inventory of OPA37GPG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA37GPG4 is usually 5 days.
3.What payment methods are accepted for OPA37GPG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA37GPG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA37GPG4?
OPA37GPG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA37GPG4 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 OPA37GPG4?
For technical support, including OPA37GPG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA37GPG4 requirements.
6.How does Aetrix verify that OPA37GPG4 is sourced from the original manufacturer or authorized distributors?
All OPA37GPG4 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 OPA37GPG4 meets industry standards.
7.What is the process for return or replacement of OPA37GPG4?
All OPA37GPG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA37GPG4, 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 OPA37GPG4 part is unused and in its original packaging.
Return procedure for OPA37GPG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA37GPG4 Tags
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