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Texas Instruments OPA37GUG4
- Part No.:
- OPA37GUG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA37GUG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,593
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Product details
Overview
OPA37GUG4 from Texas Instruments is a decompensated, ultra-low-noise, high-precision bipolar operational amplifier optimized for closed-loop gain ≥5. It delivers 4.5nV/√Hz max input voltage noise at 1kHz, 100µV max offset voltage, and 0.4µV/°C max drift - enabling high-fidelity signal conditioning in precision instrumentation and professional audio front-ends.
For engineers reviewing the OPA37GUG4 datasheet, OPA37GUG4 pinout, OPA37GUG4 application, or OPA37GUG4 equivalent, key selection considerations include its 45MHz gain-bandwidth product, 11V/µs slew rate at G=5, ±22V supply range, and SOIC-8 packaging with MSL Level-3 reflow compatibility - all critical for low-drift, wideband analog signal chains requiring stable DC accuracy and dynamic performance.
Technical Context
The OPA37GUG4 is the SOIC-8 packaged variant of the OPA37 family, sharing identical electrical specifications with the PDIP version (OPA37GP) but differing in thermal resistance (θJA = 160°C/W vs. 100°C/W) and reflow profile (MSL Level-3). Its decompensated architecture requires minimum closed-loop gain of 5 to ensure stability, distinguishing it from the unity-gain-stable OPA27.
It employs laser-trimmed thin-film resistors for long-term offset stability and features a bias current cancellation circuit enabling guaranteed bias/offset current specs across –40°C to +85°C. Input protection uses back-to-back diodes without series current-limiting resistors - preserving low-noise performance but requiring external input current limiting if differential voltage exceeds ±0.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 4.5nV/√Hz max at 1kHz - enables sub-µV signal amplification in low-level sensor interfaces without dominating system noise floor. |
| Offset Voltage | 100µV max - supports 16-bit+ DC-coupled data acquisition with <0.0015% full-scale error at ±10V output range. |
| Drift | 0.4µV/°C max - ensures <±3.4µV total drift over industrial temperature range (–40°C to +85°C), critical for unattended measurement systems. |
| Gain-Bandwidth | 45MHz typ - allows stable operation up to ~9MHz at G=5, supporting fast settling in active filters and precision ADC drivers. |
| Slew Rate | 11V/µs at G=5 - delivers 10Vpp signals at ≤1.7MHz without slewing distortion, suitable for audio and test equipment line drivers. |
| Supply Range | ±4V to ±22V - accommodates both low-voltage portable instrumentation and high-dynamic-range industrial systems. |
| CMRR | 100dB min - rejects >100,000:1 common-mode interference, essential for bridge sensor amplification and ECG front-ends. |
Pinout & Package
OPA37GUG4 is housed in an 8-pin SOIC (D) package with 1.27mm pitch, 3.9mm width, and 1.75mm max height. Thermal resistance θJA = 160°C/W; MSL Level-3 (260°C peak, 168hr floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to wiper of 10kΩ trim potentiometer for fine offset adjustment; nulling large system offsets degrades drift by ~3.3µV/°C per mV trimmed. |
| 2 | Inverting Input (–In) | Differential input node; protected by back-to-back diodes - must limit differential voltage to ≤±0.7V to avoid damage. |
| 3 | Non-Inverting Input (+In) | Differential input node; same protection scheme as Pin 2; layout symmetry critical to minimize thermoelectric offset errors. |
| 4 | –VCC | Negative supply rail; supports ±4V to ±22V operation; decoupling capacitor required within 1cm for stability. |
| 5 | Offset Trim (+) | Connects to one end of 10kΩ trim potentiometer; opposite end ties to +VCC; unused terminal left open. |
| 6 | Output | Capacitive load drive capability: stable with ≤25pF; larger loads require isolation resistor or feedback compensation. |
| 7 | +VCC | Positive supply rail; same decoupling requirements as Pin 4; ground plane under power pins reduces noise coupling. |
| 8 | NC | No internal connection - must remain unconnected; not used for thermal pad or shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | Enables 100µV max offset and 0.4µV/°C max drift - eliminates need for external trimming in most applications while ensuring long-term stability. |
| Decompensated architecture | Requires G ≥ 5 for stability - trades unity-gain flexibility for 45MHz GBW and 11V/µs slew rate, ideal for fixed-gain precision stages. |
| Bias current cancellation | Maintains ±80nA max input bias current over –40°C to +85°C - prevents gain error drift in high-impedance transducer interfaces. |
| Back-to-back diode input protection | Preserves 4.5nV/√Hz noise performance by omitting series current-limiting resistors - mandates external input current limiting if >±0.7V differential applied. |
| SOIC-8 MSL Level-3 compliance | Supports automated SMT assembly with 260°C peak reflow and 168-hour floor life - compatible with standard J-STD-020 Class 3 production lines. |
Applications
| Precision Instrumentation | Data Acquisition Systems |
|---|---|
Use Scenario: Amplifying µV-level outputs from strain gauge bridges in weigh scales and pressure sensors. IC Role / Device Role / Timing Role: Primary low-noise, low-drift instrumentation amplifier stage with gain ≥5 and DC-coupled signal path. Use Value: 4.5nV/√Hz noise and 0.4µV/°C drift enable 24-bit effective resolution over industrial temperature range without recalibration. |
Use Scenario: Front-end conditioning for 16-bit SAR ADCs in modular DAQ modules handling multiple sensor types. IC Role / Device Role / Timing Role: Programmable-gain amplifier (PGA) driver with stable phase margin and fast settling (25µs to 0.01%). Use Value: 45MHz GBW and 11V/µs slew rate support 100kSPS sampling with <1LSB integral nonlinearity error. |
| 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: High-gain, low-distortion voltage amplifier with precise 1kHz noise floor and minimal warm-up drift. Use Value: 4.5nV/√Hz at 1kHz and <0.25µVPP 0.1Hz–10Hz noise preserve dynamic range in vinyl playback systems. |
Use Scenario: Signal conditioning for hydrophone and piezoelectric vibration sensors in structural health monitoring. IC Role / Device Role / Timing Role: Charge-to-voltage converter interface with high CMRR and low input bias current for high-Z sources. Use Value: 100dB CMRR and ±80nA bias current prevent signal corruption from cable leakage and triboelectric effects. |
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 | Unity-gain stable; 5MHz GBW; 1.7V/µs slew rate; higher noise (8nV/√Hz typ at 1kHz) | Preferred for G=1 buffers and low-speed precision integrators where stability at unity gain is mandatory | Select OPA27GU when closed-loop gain <5 is required or when lower bandwidth suffices for reduced power consumption (3.3mA vs 5.7mA) |
| AD827ARZ | Unity-gain stable; 50MHz GBW; 300V/µs slew rate; higher noise (10nV/√Hz typ at 1kHz); FET input | Better suited for high-speed, high-impedance source buffering where input capacitance and bias current matter more than DC drift | Choose AD827ARZ for video or RF IF amplification where speed dominates, but avoid for µV-level DC-critical applications due to higher drift (1µV/°C) |
Compared with OPA27GU, OPA37GUG4 offers 9× higher bandwidth and 6.5× faster slew rate at the cost of requiring G≥5; versus AD827ARZ, it provides superior DC precision (0.4µV/°C vs 1µV/°C) and lower noise but lacks unity-gain stability and FET-input high impedance.
Availability
OPA37GUG4 is available at Aetrix Electronics and suitable for precision instrumentation, data acquisition, and professional audio equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for OPA37GUG4 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 expertise in precision op-amps and signal chain solutions.
The OPA37GUG4 belongs to TI's OPAx37 ultra-low-noise precision op-amp family, designed specifically for high-resolution measurement systems where nanovolt-level noise, microvolt-level drift, and stable high-speed performance are simultaneously required.
FAQ
What is the minimum closed-loop gain required for stable operation of the OPA37GUG4?
The OPA37GUG4 is decompensated and requires a minimum closed-loop gain of 5 to ensure stability across temperature and process variations. Operating at G<5 risks peaking or oscillation, especially with capacitive loads. This differs from the unity-gain-stable OPA27GU and must be verified in the final PCB layout using phase margin simulation.
Does the OPA37GUG4 have internal input protection, and what are the limits?
Yes, the OPA37GUG4 uses back-to-back diodes on both inputs for ESD and transient protection. However, it omits series current-limiting resistors to preserve low-noise performance. Differential input voltage must not exceed ±0.7V; beyond that, input current must be externally limited to ≤25mA to prevent damage. This is critical in sensor interfaces with potential overvoltage events.
How does the OPA37GUG4 compare to the OPA27GU in terms of noise and bandwidth?
The OPA37GUG4 achieves 4.5nV/√Hz max noise at 1kHz and 45MHz gain-bandwidth, while the OPA27GU specifies 8nV/√Hz typ at 1kHz and 5MHz GBW. The OPA37GUG4 trades unity-gain stability for 9× higher bandwidth and lower noise - making it optimal for fixed-gain, high-speed precision stages where OPA27GU would be bandwidth-limited.
Can the OPA37GUG4 replace OP-37 or AD517 in existing designs?
Yes, the OPA37GUG4 is explicitly positioned as an improved replacement for OP-37 and AD517, offering lower noise (4.5nV/√Hz vs 12nV/√Hz), tighter offset (100µV vs 250µV), and better drift (0.4µV/°C vs 2µV/°C). Pinout and SOIC-8 footprint match OP-37, but verify gain configuration and compensation network compatibility before drop-in replacement.
What is the recommended offset trim configuration for the OPA37GUG4?
A 10kΩ potentiometer connected between Pins 1 and 5, with wiper to Pin 1, is recommended for offset trimming. Using values outside 1kΩ–1MΩ degrades drift performance by 0.1–0.2µV/°C. Nulling large system offsets (>1mV) adds ~3.3µV/°C drift per mV trimmed - so input summing is preferred for large corrections to preserve OPA37GUG4's inherent 0.4µV/°C drift spec.
OPA37GUG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- -
- 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
OPA37GUG4 FAQ
1.How can I place an order for OPA37GUG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA37GUG4 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 OPA37GUG4 reliable?
The price and inventory of OPA37GUG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA37GUG4 is usually 5 days.
3.What payment methods are accepted for OPA37GUG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA37GUG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA37GUG4?
OPA37GUG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA37GUG4 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 OPA37GUG4?
For technical support, including OPA37GUG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA37GUG4 requirements.
6.How does Aetrix verify that OPA37GUG4 is sourced from the original manufacturer or authorized distributors?
All OPA37GUG4 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 OPA37GUG4 meets industry standards.
7.What is the process for return or replacement of OPA37GUG4?
All OPA37GUG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA37GUG4, 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 OPA37GUG4 part is unused and in its original packaging.
Return procedure for OPA37GUG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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