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Texas Instruments OPA337PA
- Part No.:
- OPA337PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA337PA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,692
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Product details
Overview
OPA337PA from Texas Instruments is a single, rail-to-rail output CMOS operational amplifier in an 8-pin PDIP package, unity-gain stable, with 3MHz gain-bandwidth product, 1.2V/µs slew rate, and 525µA quiescent current per amplifier. It operates from 2.5V to 5.5V single supply and delivers ±3mV input offset voltage (max) and 120dB open-loop gain - ideal for precision low-power signal conditioning in battery-powered instrumentation.
For engineers reviewing the OPA337PA datasheet, OPA337PA pinout, OPA337PA application, or OPA337PA equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for space-constrained, single-supply analog front-ends requiring FET-input performance and rail-to-rail output swing.
Technical Context
The OPA337PA implements a CMOS input stage with 10pA max input bias current and rail-to-rail output swing down to 125mV from each rail at 25kΩ load. Its input common-mode range extends from (V−) − 0.2V to (V+) − 1.2V, enabling ground-referenced sensing in single-supply systems.
Designed for unity-gain stability, it maintains phase margin across temperature (−40°C to +85°C) and supply voltage (2.7V–5.5V), with no phase inversion even when inputs exceed rails by up to 500mV - a key differentiator versus bipolar-input op amps in sensor interface applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports stable closed-loop operation up to ~300kHz at G = 10 without compensation. |
| Slew Rate | 1.2V/µs - enables clean 100kHz full-scale sine wave output with ≤1% THD+N at 3VPP. |
| Input Bias Current | ±10pA max - preserves signal integrity in high-impedance photodiode or pH probe interfaces. |
| Open-Loop Gain | 120dB - ensures <0.0025% gain error in precision buffer or gain-of-10 configurations. |
| Quiescent Current | 525µA per amplifier - allows continuous operation for >1 year on a single CR2032 coin cell in portable medical sensors. |
| Input Offset Voltage | ±3.5mV max over temperature - sets absolute DC accuracy limit in 12-bit ADC driver applications. |
| Supply Voltage Range | 2.5V to 5.5V - interoperable with Li-ion, 3.3V logic, and dual-supply legacy systems without level-shifting. |
Pinout & Package
OPA337PA is housed in an 8-pin plastic dual in-line package (PDIP), 0.300" wide, with through-hole mounting and industry-standard SOIC-compatible footprint. Thermal resistance θJA = 100°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−In) | High-impedance CMOS node; accepts signals within −0.2V to (V+) − 1.2V common-mode range. |
| 2 | Non-Inverting Input (+In) | Same CMOS input structure as Pin 1; differential pair gate terminal for precision DC-coupled amplification. |
| 3 | Output | Rail-to-rail capable: swings within 125mV of V− and V+ under 25kΩ load at room temperature. |
| 4 | V− (Ground/−VS) | Reference return for single-supply operation; must be decoupled with 0.01µF ceramic capacitor near pin. |
| 5 | NC | No internal connection; electrically isolated - may be left unconnected or grounded for mechanical stability. |
| 6 | NC | No internal connection; electrically isolated - not used in OPA337 series; avoid routing signals here. |
| 7 | V+ (+VS) | Positive supply input; supports 2.5V–5.5V operation; requires local 0.01µF ceramic bypass to V−. |
| 8 | NC | No internal connection; electrically isolated - unused pin per device architecture. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full dynamic range into 25kΩ loads - eliminates need for level-shifting in 3.3V microcontroller ADC interfaces. |
| FET-input architecture | 10pA max input bias current enables direct coupling to megohm-range sensors (e.g., thermistors, pH electrodes) without offset drift. |
| Unity-gain stability | Operates robustly at G = 1 without external compensation - simplifies design of buffers, active filters, and reference followers. |
| Single-supply operation from 2.5V | Enables use in ultra-low-voltage battery systems (e.g., coin-cell powered wearables) while maintaining 120dB open-loop gain. |
| No phase inversion | Accepts input transients beyond supply rails (up to ±500mV) without polarity reversal - critical for fault-tolerant sensor front-ends. |
Applications
| Battery-Powered Instrumentation | Photodiode Pre-Amplifiers |
|---|---|
Use Scenario: Portable multimeter front-end measuring µA-level leakage currents with 12-bit resolution. IC Role / Device Role / Timing Role: Precision transimpedance amplifier converting photodiode current to voltage with minimal input loading. Use Value: 10pA input bias current prevents measurement error in high-impedance (>100MΩ) feedback networks. |
Use Scenario: Low-noise optical smoke detector using reverse-biased silicon photodiode. IC Role / Device Role / Timing Role: Transimpedance amplifier with 100kΩ feedback resistor and 3MHz bandwidth. Use Value: 26nV/√Hz input voltage noise density ensures sub-100nA detection threshold at 1kHz bandwidth. |
| Medical Instrumentation | Driving ADCs |
Use Scenario: ECG electrode amplifier in handheld vital signs monitor operating from 3.0V coin cell. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier buffer with rail-to-rail output swing. Use Value: 525µA quiescent current enables >18 months of standby operation between battery replacements. |
Use Scenario: Driving ADS7822 12-bit SAR ADC in low-power data acquisition system. IC Role / Device Role / Timing Role: Output buffer isolating ADC input capacitance from driving source impedance. Use Value: 1.2V/µs slew rate settles 2V step within 2.5µs to 0.01%, meeting 100ksps sampling requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA340PA | Higher GBW (5.5MHz), lower input offset (±0.25mV typ), same PDIP-8 package and 2.7V–5.5V supply. | Preferred for higher-speed sensor interfaces (e.g., ultrasonic pulse amplification) where 3MHz GBW is limiting. | Select OPA340PA when improved DC precision and bandwidth justify slightly higher quiescent current (750µA). |
| MCP6001P | Lower quiescent current (100µA), narrower GBW (1MHz), same rail-to-rail I/O, but only specified to 5.5V (not 2.5V min). | Suitable for ultra-low-power applications where speed <100kHz and supply ≥2.7V are acceptable constraints. | Choose MCP6001P only if supply voltage remains ≥2.7V and settling time >5µs is tolerable. |
Compared with OPA337PA, OPA340PA offers superior AC and DC performance at modest power cost, while MCP6001P trades bandwidth and low-voltage operation for extreme quiescent current reduction - making each suitable for distinct segments of low-power analog signal chains.
Availability
OPA337PA is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode pre-amplifiers, and medical instrumentation requiring stable component supply with long-term industrial availability.
Supply support for OPA337PA 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 amp design and manufacturing.
The OPA337PA belongs to TI's MicroAmplifier™ series, engineered specifically for miniature, low-power, single-supply applications where rail-to-rail output, FET-input performance, and unity-gain stability are essential.
FAQ
What is the minimum operating voltage for the OPA337PA?
The OPA337PA operates down to 2.5V on a single supply, with full specification compliance from 2.7V to 5.5V. At 2.5V, it retains rail-to-rail output swing and unity-gain stability, though some parameters (e.g., GBW, slew rate) scale downward per typical curves in the SBOS077B datasheet. This makes OPA337PA viable for coin-cell and energy-harvesting systems where voltage droop occurs.
Does the OPA337PA require external compensation for unity-gain operation?
No, the OPA337PA is internally compensated for unity-gain stability and requires no external components to operate stably at G = 1. Its phase margin exceeds 60° across temperature and supply voltage ranges, eliminating risk of oscillation in buffer or follower configurations - a key advantage over the higher-speed OPA338 series, which mandates gain ≥5 or external compensation.
Can the OPA337PA drive capacitive loads such as ADC inputs?
Yes, the OPA337PA can directly drive typical ADC input capacitances (≤20pF) without instability. For larger loads (e.g., 100pF), the datasheet confirms 0.1% settling in 2µs with 2V step - sufficient for 12-bit SAR converters like ADS7822. For >100pF, isolation via series resistor (e.g., 10–50Ω) is recommended to maintain phase margin.
What is the meaning of "NC" pins on the OPA337PA PDIP package?
Pins 5, 6, and 8 on the OPA337PA are designated NC (No Connection) - they have no internal bond wire or circuit connection. These pins are physically present for mechanical symmetry and PCB compatibility with dual op amp variants (e.g., OPA2337PA), but must remain unconnected in circuit design. Routing traces or vias to them is unnecessary and may compromise thermal or noise performance.
How does the OPA337PA handle input voltages beyond the supply rails?
The OPA337PA exhibits no phase inversion when inputs exceed V− or V+ by up to ±500mV - a documented feature enabled by its CMOS input stage. While operation outside the common-mode range (−0.2V to V+ − 1.2V) degrades PSRR and CMRR, the amplifier remains functional and non-destructive, provided input current is limited to <10mA via series resistors - critical for robustness in transient-prone sensor interfaces.
OPA337PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA337PA FAQ
1.How can I place an order for OPA337PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA337PA 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 OPA337PA reliable?
The price and inventory of OPA337PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA337PA is usually 5 days.
3.What payment methods are accepted for OPA337PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA337PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA337PA?
OPA337PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA337PA 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 OPA337PA?
For technical support, including OPA337PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA337PA requirements.
6.How does Aetrix verify that OPA337PA is sourced from the original manufacturer or authorized distributors?
All OPA337PA 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 OPA337PA meets industry standards.
7.What is the process for return or replacement of OPA337PA?
All OPA337PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA337PA, 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 OPA337PA part is unused and in its original packaging.
Return procedure for OPA337PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA337PA Tags
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