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Texas Instruments OPA337UA
- Part No.:
- OPA337UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA337UA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:621
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Product details
Overview
OPA337UA from Texas Instruments is a single, rail-to-rail output CMOS operational amplifier in SOIC-8 package, featuring 3MHz gain-bandwidth, 1.2V/µs slew rate, 120dB open-loop gain, ±3mV input offset voltage (max), and 525µA quiescent current per amplifier. It operates from 2.5V to 5.5V single supply and is unity-gain stable-ideal for battery-powered instrumentation and photodiode pre-amplification.
For engineers reviewing the OPA337UA datasheet, OPA337UA pinout, OPA337UA application, or OPA337UA equivalent, key selection criteria include rail-to-rail output swing down to 125mV from rails (RL = 25kΩ), FET-input bias current ≤10pA, input common-mode range extending to ground, and guaranteed stability at G = 1 without external compensation.
Technical Context
The OPA337UA employs advanced CMOS process technology to achieve ultra-low input bias current (≤10pA) while maintaining high-speed performance and rail-to-rail output capability. Its input stage includes ESD-protected FET inputs with differential impedance ≥10¹³ Ω and common-mode rejection ratio of 74–90dB across −0.2V to (V+)−1.2V.
Designed for single-supply operation, the OPA337UA supports input voltages down to ground and delivers full output swing within 125mV of both supply rails under 25kΩ load. It exhibits no phase inversion when inputs exceed supply rails by up to 500mV, provided input current is limited to <10mA via series resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz at G = 1 - enables stable amplification of signals up to ~300kHz with 10x gain margin. |
| Slew Rate | 1.2V/µs - supports 1Vpp output at 190kHz without slew-induced distortion. |
| Input Bias Current | ≤10pA max - preserves signal integrity in high-impedance sensor interfaces like photodiodes. |
| Input Offset Voltage | ±3.5mV max over −40°C to +85°C - ensures sub-10mV error in DC-coupled precision gain stages. |
| Quiescent Current | 525µA per amplifier - enables multi-channel low-power designs with <2.1mA total for four op amps. |
| Supply Voltage Range | 2.5V to 5.5V - compatible with Li-ion, 3.3V, and 5V systems without level-shifting. |
| Output Swing (vs Rail) | 125mV min from rail (RL = 25kΩ) - maximizes dynamic range in single-supply data acquisition front-ends. |
Pinout & Package
OPA337UA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) surface-mount package (Package Designator: D), with standard 1.27mm pitch and RoHS-compliant NiPdAu lead finish. Moisture Sensitivity Level is Level-2-260°C-1 YEAR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−In) | Differential input node; high-impedance FET input with ≤10pA bias current. |
| 2 | Non-Inverting Input (+In) | Differential input node; accepts common-mode voltage from ground to (V+)−1.2V. |
| 3 | Output | Rail-to-rail output capable of sourcing/sinking ±9mA; swings within 125mV of V− or V+ under 25kΩ load. |
| 4 | V− (Ground/−VS) | Negative supply terminal; referenced to system ground in single-supply configurations. |
| 5 | NC | No internal connection; left unconnected per datasheet. |
| 6 | NC | No internal connection; left unconnected per datasheet. |
| 7 | NC | No internal connection; left unconnected per datasheet. |
| 8 | V+ (+VS) | Positive supply terminal; supports 2.5V to 5.5V operation with bypassing recommended. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers usable output headroom down to 125mV from either supply rail-critical for maximizing ADC input range in 3.3V systems. |
| FET-input architecture | Input bias current ≤10pA enables direct interfacing with high-Z sources (e.g., photodiodes, pH electrodes) without signal degradation. |
| Unity-gain stability | Guaranteed stable at G = 1 without external compensation-reduces BOM count and layout complexity in buffer applications. |
| Single-supply operation from 2.5V | Operates from coin-cell or Li-ion voltages; input common-mode range includes ground, eliminating need for level-shifting circuitry. |
| No phase inversion | Remains linear even when inputs exceed supply rails by up to 500mV-prevents latch-up and signal corruption in transient conditions. |
Applications
| Battery-Powered Instruments | Photodiode Pre-Amps |
|---|---|
Use Scenario: Portable multimeters and handheld gas analyzers requiring microamp-level current measurement with minimal power draw. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting photodiode current to voltage with low noise and rail-to-rail output. Use Value: 10pA input bias current minimizes dark-current error; 525µA quiescent current extends battery life in always-on sensing nodes. | Use Scenario: Optical smoke detectors and spectrophotometers using reverse-biased photodiodes in high-impedance configurations. IC Role / Device Role / Timing Role: Low-noise, high-input-impedance amplifier conditioning weak photocurrent signals before ADC digitization. Use Value: 26nV/√Hz input voltage noise density and 0.6fA/√Hz current noise preserve SNR in sub-nA signal chains. |
| Medical Instruments | Driving ADCs |
Use Scenario: Portable ECG monitors and pulse oximeters where low power, small size, and DC accuracy are essential. IC Role / Device Role / Timing Role: Front-end signal conditioner amplifying biopotential signals with high CMRR and rail-to-rail output swing. Use Value: 74–90dB CMRR rejects common-mode interference; 120dB open-loop gain ensures <0.1% gain error in 100× gain stages. | Use Scenario: Driving SAR and delta-sigma ADCs in portable data loggers and sensor fusion modules. IC Role / Device Role / Timing Role: Output buffer isolating ADC input from source impedance variations and ensuring fast settling (<2.5µs to 0.01%). Use Value: 1.2V/µs slew rate and 2.5µs 0.01% settling time support 100ksps sampling with 12-bit accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA340UA | Higher GBW (5.5MHz), lower input offset (±0.25mV typ), same SOIC-8 package and 2.7–5.5V supply range. | Better suited for higher-frequency signal conditioning (e.g., audio line drivers) but draws 750µA vs 525µA. | Select OPA340UA when bandwidth >3MHz or offset <1mV is required; retain OPA337UA for strict µA-level power budgets. |
| MCP6001T-I/OT | Lower quiescent current (100µA), smaller SOT-23-5 package, but reduced GBW (1MHz) and higher offset (±1.5mV max). | Ideal for space-constrained, ultra-low-power sensor buffers where speed <100kHz suffices. | Choose MCP6001T-I/OT for footprint-sensitive, sub-200µA applications; use OPA337UA when 3MHz GBW and rail-to-rail output are mandatory. |
Compared with OPA340UA and MCP6001T-I/OT, the OPA337UA uniquely balances 3MHz bandwidth, rail-to-rail output, and 525µA quiescent current in SOIC-8-making it optimal for mid-speed, precision, single-supply instrumentation where thermal and layout constraints exclude SOT-23 but power limits exclude higher-IQ alternatives.
Availability
OPA337UA is available at Aetrix Electronics and suitable for battery-powered instruments, photodiode pre-amplifiers, and medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for OPA337UA 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA337UA belongs to TI's MicroAmplifier™ series-designed specifically for low-cost, miniature, single-supply applications demanding rail-to-rail output, low input bias current, and unity-gain stability in space-constrained systems.
FAQ
What is the maximum operating temperature range for the OPA337UA?
The OPA337UA is specified for operation from −40°C to +85°C ambient temperature, with absolute maximum junction temperature rated at 150°C. Storage and operating ranges extend to −55°C to +125°C, supporting deployment in industrial environments with wide thermal excursions. Thermal resistance (θJA) for the SOIC-8 package is 150°C/W.
Does the OPA337UA require external compensation for unity-gain stability?
No, the OPA337UA is internally compensated and unity-gain stable-no external capacitors or feedback network adjustments are needed for G = 1 configurations. This simplifies design in buffer, voltage-follower, and gain-of-one signal conditioning applications, reducing component count and PCB area versus uncompensated amplifiers like the OPA338UA.
Can the OPA337UA drive capacitive loads directly?
The OPA337UA can drive moderate capacitive loads (e.g., ≤100pF) without instability, as confirmed by typical settling time and overshoot curves in the datasheet. For larger loads (>100pF), isolation resistance (e.g., 10–100Ω in series with output) is recommended to maintain phase margin and prevent peaking or oscillation-especially in ADC driver or filter applications.
What is the input common-mode voltage range of the OPA337UA?
The OPA337UA supports an input common-mode voltage range from (V−) − 0.2V to (V+) − 1.2V, which includes ground in single-supply operation. This allows direct interfacing with sensors referenced to system ground-eliminating level-shifters-and ensures linear operation even when one input is at 0V while the other is near V+.
Is the OPA337UA pin-compatible with other op amps in SOIC-8 format?
The OPA337UA follows standard SOIC-8 pinout (1=−In, 2=+In, 3=Out, 4=V−, 8=V+), matching industry conventions for single op amps. However, pins 5–7 are NC and must remain unconnected; this differs from dual op amps (e.g., OPA2337UA) or rail-splitter ICs. Always verify pin function against the specific device's datasheet before board reuse.
OPA337UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.2V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 525µA
- Current - Output / Channel:
- 9 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA337UA FAQ
1.How can I place an order for OPA337UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA337UA 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 OPA337UA reliable?
The price and inventory of OPA337UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA337UA is usually 5 days.
3.What payment methods are accepted for OPA337UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA337UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA337UA?
OPA337UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA337UA 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 OPA337UA?
For technical support, including OPA337UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA337UA requirements.
6.How does Aetrix verify that OPA337UA is sourced from the original manufacturer or authorized distributors?
All OPA337UA 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 OPA337UA meets industry standards.
7.What is the process for return or replacement of OPA337UA?
All OPA337UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA337UA, 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 OPA337UA part is unused and in its original packaging.
Return procedure for OPA337UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA337UA Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
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LM2902PWR
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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