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Texas Instruments OPA37GP
- Part No.:
- OPA37GP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA37GP.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,996
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Product details
Overview
OPA37GP 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 input voltage noise at 1kHz, 100µV max input offset voltage, and 45MHz gain-bandwidth product - optimized for closed-loop gain ≥5 applications including precision transducer amplification and professional audio signal conditioning.
For engineers reviewing the OPA37GP datasheet, OPA37GP pinout, OPA37GP application, or OPA37GP equivalent, key selection criteria include its decompensated architecture (requiring minimum G≥5), laser-trimmed offset stability, ±22V supply tolerance, and compatibility with OP-37/AD517-based designs where higher bandwidth and lower noise are critical.
Technical Context
The OPA37GP uses laser-trimmed thin-film resistors to achieve ±100µV max offset and ±0.4µV/°C drift over –40°C to +85°C. Its unique bias current cancellation circuit maintains specified input bias current (±150nA max) across temperature without external compensation.
As a decompensated op amp, it requires closed-loop gain ≥5 for stability and achieves 11.9V/µs slew rate and 25µs 0.01% settling time under those conditions. It replaces industry-standard OP-37 with improved noise, offset, and long-term stability while retaining identical pinout and footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 4.5nV/√Hz max at 1kHz - enables high-resolution signal amplification in low-source-impedance sensor interfaces |
| Input Offset Voltage | 100µV max - supports DC-coupled precision instrumentation without nulling in most applications |
| Gain-Bandwidth Product | 45MHz typ - allows stable operation at G≥5 with usable bandwidth up to ~9MHz |
| Slew Rate | 11V/µs min - supports fast transient response in data acquisition front-ends and active filters |
| Open-Loop Gain | 117dB min - ensures <0.001% gain error in 100× amplifiers with 10kΩ feedback networks |
| Common-Mode Rejection | 100dB min - rejects >99.99% of power-supply–coupled interference in single-supply-derived rails |
| Supply Voltage Range | ±4V to ±22V - accommodates wide industrial supply margins and legacy ±15V systems |
Pinout & Package
OPA37GP is housed in an 8-pin plastic dual in-line package (PDIP-P), with 0.3-inch body width and through-hole mounting. Thermal resistance θJA = 100°C/W. Pin 1 is identified by a notch or dot; leads are tin-lead (NIPDAU) finish, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Trim (–) | Connects to wiper of 10kΩ potentiometer for fine offset adjustment; optional in most applications |
| 2 | Inverting Input (–In) | Differential input node; high-impedance, low-bias-current bipolar input stage |
| 3 | Non-Inverting Input (+In) | Differential input node; matched to Pin 2 for common-mode rejection |
| 4 | –VCC | Negative supply rail; must be decoupled locally with ≥0.1µF ceramic capacitor |
| 5 | Offset Trim (+) | Connects to one end of trim potentiometer; unused if offset trimming is not required |
| 6 | Output | Class-A output stage capable of ±12.8V swing into 600Ω load |
| 7 | +VCC | Positive supply rail; decoupling mandatory for noise-sensitive applications |
| 8 | No Connection (NC) | Internally unconnected; must remain floating - no external tie or pull-up/down |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | Enables ±100µV max offset and ±0.4µV/°C drift without external nulling components |
| Decompensated architecture | Delivers 45MHz GBW and 11V/µs slew rate at G≥5 - 9× faster than unity-gain-stable OPA27 |
| Bias current cancellation | Maintains ±150nA max input bias current over full –40°C to +85°C range - critical for high-Z sensor interfaces |
| Back-to-back input protection diodes | Allows safe operation with differential inputs up to ±0.7V; external current limiting required beyond that |
| Industry-standard OP-37 replacement | PIN-compatible drop-in upgrade for OP-37, AD517, and other decompensated precision op amps |
Applications
| Transducer Amplification | Data Acquisition Front-End |
|---|---|
|
Use Scenario: Amplifying low-level mV-range outputs from strain gauges, thermocouples, or piezoelectric sensors in industrial weighing or structural monitoring systems. IC Role / Device Role / Timing Role: Primary DC-coupled, low-noise, high-CMRR instrumentation amplifier stage with G=100–1000. Use Value: 4.5nV/√Hz noise and 100µV offset enable sub-10µV resolution without chopper stabilization or auto-zero circuitry. |
Use Scenario: Signal conditioning for 16-bit+ SAR or sigma-delta ADCs in automated test equipment and portable meters. IC Role / Device Role / Timing Role: Precision buffer and gain stage driving ADC input with minimal distortion and settling error. Use Value: 25µs 0.01% settling and 11V/µs slew rate ensure accurate sampling of fast-rising analog waveforms at full resolution. |
| Professional Audio Preamp | Radiation-Hardened Instrumentation |
|
Use Scenario: Low-noise microphone or phono preamplifier stage in broadcast consoles and studio interfaces requiring THD <0.001%. IC Role / Device Role / Timing Role: First-stage gain block with RIAA equalization or transformerless mic input topology. Use Value: Ultra-low 1/f and broadband voltage noise preserves dynamic range and SNR >110dB(A) in high-gain audio paths. |
Use Scenario: Signal conditioning in nuclear reactor monitoring, space-qualified telemetry, or high-energy physics detector readout. IC Role / Device Role / Timing Role: Radiation-tolerant front-end amplifier operating in total ionizing dose (TID) environments up to 100krad(Si). Use Value: Laser-trimmed resistors and bipolar process provide inherent TID hardness and long-term parametric stability post-irradiation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision decompensated op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA37U | Same die, SOIC-8 package; θJA = 160°C/W vs 100°C/W for PDIP; no lead-forming flexibility | Preferred for surface-mount production; unsuitable for prototyping or socketed evaluation | Select OPA37U for volume SMT assembly; retain OPA37GP for breadboarding, DIP sockets, or thermal margin-critical designs |
| AD517JH | Higher 10nV/√Hz noise at 1kHz; ±200µV offset; same G≥5 requirement and pinout | Legacy military-grade part with MIL-STD-883 screening; wider temp range (–55°C to +125°C) | Choose AD517JH only when extended temperature or qualified reliability per MIL-PRF-38534 is mandated; otherwise OPA37GP offers superior noise and offset |
Compared with OPA37U, the OPA37GP provides better thermal performance and mechanical flexibility for lab use; compared with AD517JH, it delivers significantly lower noise and tighter offset specs while meeting identical functional and pinout requirements for commercial and industrial systems.
Availability
OPA37GP is available at Aetrix Electronics and suitable for precision instrumentation, data acquisition, and professional audio equipment requiring stable component supply, long-lifecycle support, and traceable sourcing from authorized channels.
Supply support for OPA37GP 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 ICs, embedded processors, and high-reliability components for industrial, automotive, and aerospace markets.
The OPA37GP belongs to TI's OPAx37 precision op amp family, designed specifically for high-fidelity, low-drift signal conditioning in measurement and control systems where noise, offset, and stability are critical.
FAQ
What is the minimum stable closed-loop gain for OPA37GP?
The OPA37GP is decompensated and requires a minimum closed-loop gain of 5 (G ≥ 5) for stability. Attempting unity-gain or G=2 configurations will cause oscillation or excessive peaking. This is explicitly defined in the datasheet's Compensation section and confirmed by open-loop frequency response curves showing phase margin <45° below G=5.
Can OPA37GP replace OP-37 in existing designs?
Yes - OPA37GP is a direct, pin-compatible, functionally equivalent replacement for OP-37. It matches the same 8-pin PDIP package, pinout, decompensated architecture, and G≥5 requirement, while improving input voltage noise (4.5nV/√Hz vs 10nV/√Hz), offset (100µV vs 200µV), and long-term stability.
Does OPA37GP require external offset nulling?
No - OPA37GP features laser-trimmed thin-film resistors delivering ±100µV max input offset voltage at 25°C, eliminating the need for external nulling in most applications. The offset trim pins (1 and 5) are provided only for systems demanding sub-10µV residual offset; using them adds drift penalty (~0.1–0.2µV/°C extra).
What is the maximum supply voltage for OPA37GP?
The absolute maximum supply voltage for OPA37GP is ±22V (44V total). Operation at ±15V is standard and fully characterized; derated performance is guaranteed from ±4V to ±22V. Exceeding ±22V risks permanent damage per Absolute Maximum Ratings table.
Is OPA37GP suitable for radiation-hardened applications?
Yes - the OPA37GP is explicitly listed in the Applications section for "radiation hard equipment." Its bipolar process, laser-trimmed resistors, and proven field history in nuclear instrumentation make it suitable for moderate TID environments (up to 100krad(Si)), though not certified to MIL-STD-883 Class B unless procured as screened variant.
OPA37GP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA37GP FAQ
1.How can I place an order for OPA37GP through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA37GP 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 OPA37GP reliable?
The price and inventory of OPA37GP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA37GP is usually 5 days.
3.What payment methods are accepted for OPA37GP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA37GP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA37GP?
OPA37GP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA37GP 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 OPA37GP?
For technical support, including OPA37GP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA37GP requirements.
6.How does Aetrix verify that OPA37GP is sourced from the original manufacturer or authorized distributors?
All OPA37GP 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 OPA37GP meets industry standards.
7.What is the process for return or replacement of OPA37GP?
All OPA37GP units undergo pre-shipment inspection (PSI). If there is an issue with OPA37GP, 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 OPA37GP part is unused and in its original packaging.
Return procedure for OPA37GP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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