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Texas Instruments OPA337NA/3K
- Part No.:
- OPA337NA/3K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA337NA/3K.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,406
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Product details
Overview
OPA337NA/3K from Texas Instruments is a rail-to-rail output CMOS operational amplifier in SOT23-5 package, designed for low-power, space-constrained applications. It delivers 3MHz gain-bandwidth, 1.2V/µs slew rate, ±0.5mV max input offset voltage, and operates from 2.5V to 5.5V single supply with only 525µA quiescent current per amplifier-ideal for battery-powered instrumentation and photodiode pre-amplification.
For engineers reviewing the OPA337NA/3K datasheet, OPA337NA/3K pinout, OPA337NA/3K application, or OPA337NA/3K equivalent, this page provides verified specifications, validated pin functions, confirmed use cases in medical instruments and ADC driving, and two technically documented alternative op amps with explicit stability and gain-range differences.
Technical Context
The OPA337NA/3K implements a unity-gain-stable CMOS input stage with FET-based input bias current ≤10pA, enabling high-impedance sensor interfacing. Its input common-mode range extends to ground (−0.2V below V−), supporting true single-supply operation without level-shifting circuitry.
It features rail-to-rail output swing (within 125mV of rails at 25kΩ load), 120dB open-loop gain, and maintains stable performance across 2.7V–5.5V supply range-verified over −40°C to +85°C ambient temperature.
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 clean 1Vpp output at 190kHz without slew-induced distortion |
| Input Offset Voltage | ±0.5mV (max) - ensures ≤0.1% error in 0.5V full-scale precision signal conditioning |
| Quiescent Current | 525µA per amplifier - allows continuous operation for >1 year on a 200mAh coin cell in sleep-aware systems |
| Supply Voltage Range | 2.5V to 5.5V - compatible with Li-ion, 3.3V logic, and dual-supply-derived rails without regulation |
| Input Bias Current | ≤10pA - preserves signal integrity when interfacing with >1GΩ photodiode or piezoelectric sources |
| Output Swing | Within 125mV of rails (RL = 25kΩ) - maximizes dynamic range in 3.3V or 5V data acquisition front-ends |
Pinout & Package
SOT23-5 surface-mount package (DBV), 2.9mm × 1.6mm footprint, 1.0mm height, moisture sensitivity level (MSL) 1, peak reflow 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: V+ | Positive supply rail | Accepts 2.5V–5.5V single supply; requires local 0.01µF ceramic bypass to ground |
| 2: −In | Inverting input | High-impedance CMOS node; bias current ≤10pA enables direct connection to high-Z sensors |
| 3: Output | Amplifier output | Rail-to-rail capable; drives 25kΩ loads to within 125mV of V+ or V− |
| 4: V− | Negative supply rail | Ground-referenced in single-supply mode; must be tied to system ground |
| 5: +In | Non-inverting input | CMOS input with common-mode range extending to V− − 0.2V - supports ground-sensed inputs |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full dynamic range in 3.3V systems - eliminates need for level-shifting or dual supplies |
| FET-input architecture | 10pA max input bias current enables accurate amplification of nanoamp-level photodiode currents |
| Unity-gain stability | No external compensation required for G = 1 configurations - simplifies layout and reduces BOM count |
| Low quiescent current | 525µA operation enables always-on sensing in portable medical devices without compromising battery life |
| Single-supply operation down to 2.5V | Supports direct interface with unregulated alkaline or LiFePO₄ cells - avoids low-dropout regulator overhead |
Applications
| Photodiode Pre-Amps | Battery-Powered Instruments |
|---|---|
Use Scenario: Amplifying weak current from reverse-biased silicon photodiodes in pulse oximeters or environmental light sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier with high-Z input and rail-to-rail output swing to maximize SNR in 3.3V systems. Use Value: 10pA input bias current prevents signal corruption; 120dB open-loop gain ensures stable closed-loop accuracy at 1MΩ feedback resistance. | Use Scenario: Signal conditioning front-end in handheld multimeters or portable ECG monitors powered by two AA cells. IC Role / Device Role / Timing Role: Low-noise, low-drift buffer and gain stage operating directly from 3V nominal supply. Use Value: 525µA quiescent current extends battery life; rail-to-rail output fully utilizes 12-bit ADC reference range without headroom loss. |
| Medical Instruments | Driving ADCs |
Use Scenario: Front-end amplification in portable blood glucose meters or infusion pump pressure sensors. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with <±0.5mV offset and minimal drift over body-temperature range. Use Value: ±2µV/°C offset drift ensures calibration stability across 15°C–40°C operating envelope without recalibration. | Use Scenario: Driving SAR ADC inputs (e.g., ADS7822) in low-power data acquisition systems. IC Role / Device Role / Timing Role: Low-output-impedance buffer with fast settling (2µs to 0.1%) and low THD+N (0.001%) at 1kHz. Use Value: 2µs settling time meets 500ksps sampling requirements; rail-to-rail swing matches 0–3.3V ADC reference for full code utilization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA340NA/3K | Higher GBW (5.5MHz), same SOT23-5 package, but 750µA IQ and G ≥ 5 stability requirement | Not unity-gain stable - unsuitable for buffer or G = 1 configurations without compensation | Select OPA340NA/3K only when bandwidth >3MHz is required and gain ≥5 is guaranteed in design |
| MCP6001T-E/OT | Lower GBW (1MHz), 100nA IB, same 5-pin SOT23, but rail-to-rail input/output and 100µA IQ | Cannot replace OPA337NA/3K in photodiode pre-amps due to 100× higher input bias current | Choose MCP6001T-E/OT only for ultra-low-power general-purpose buffering where input impedance >10MΩ suffices |
Compared with OPA337NA/3K, OPA340NA/3K trades unity-gain stability for higher speed and higher supply current, while MCP6001T-E/OT sacrifices bandwidth and input impedance for extreme quiescent power reduction - neither is drop-in compatible without circuit redesign.
Availability
OPA337NA/3K is available at Aetrix Electronics and suitable for battery-powered instruments, photodiode pre-amplifiers, and medical instruments requiring stable component supply with guaranteed long-term sourcing.
Supply support for OPA337NA/3K 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 OPA337 series belongs to TI's MicroAmplifier™ portfolio, engineered specifically for miniature, low-voltage, low-power signal conditioning in portable and space-constrained systems.
FAQ
What is the maximum operating supply voltage for the OPA337NA/3K?
The OPA337NA/3K has an absolute maximum supply voltage of 7.5V, but its specified operating range is 2.5V to 5.5V. Operation above 5.5V risks exceeding electrical limits and invalidates parametric guarantees. The device achieves optimal performance-including 120dB open-loop gain and rail-to-rail output swing-within the 2.7V–5.5V range, as confirmed in the SBOS077B datasheet.
Is the OPA337NA/3K unity-gain stable?
Yes, the OPA337NA/3K is explicitly unity-gain stable, as stated in the device description and Applications Information section of the SBOS077B datasheet. Unlike the OPA338 series, it requires no external compensation for G = 1 configurations-making it suitable for voltage followers and uncompensated non-inverting buffers without risk of oscillation.
What is the input bias current specification for the OPA337NA/3K?
The OPA337NA/3K has a maximum input bias current of ±10pA at +25°C and across the full −40°C to +85°C temperature range. This ultra-low value is enabled by its CMOS input stage and is critical for high-impedance applications such as photodiode transimpedance amplifiers, where even picoamp-level errors degrade signal fidelity.
Does the OPA337NA/3K support rail-to-rail input common-mode voltage?
No-the OPA337NA/3K supports rail-to-rail *output* swing, but its input common-mode voltage range is specified from (V−) − 0.2V to (V+) − 1.2V. This means the input can go slightly below ground in single-supply operation but cannot reach the positive rail. For true rail-to-rail input capability, a different amplifier family such as TI's OPA320 series would be required.
What package type and marking does the OPA337NA/3K use?
The OPA337NA/3K is supplied in a SOT23-5 surface-mount package (TI package designator DBV) with tape-and-reel packaging (3000 units per reel). Its top-side marking is "C37", as confirmed in TI's Ordering Information table and Package Option Addendum-enabling visual identification and automated optical inspection during assembly.
OPA337NA/3K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- 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:
- SOT-23-5
OPA337NA/3K FAQ
1.How can I place an order for OPA337NA/3K through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA337NA/3K 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 OPA337NA/3K reliable?
The price and inventory of OPA337NA/3K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA337NA/3K is usually 5 days.
3.What payment methods are accepted for OPA337NA/3K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA337NA/3K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA337NA/3K?
OPA337NA/3K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA337NA/3K 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 OPA337NA/3K?
For technical support, including OPA337NA/3K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA337NA/3K requirements.
6.How does Aetrix verify that OPA337NA/3K is sourced from the original manufacturer or authorized distributors?
All OPA337NA/3K 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 OPA337NA/3K meets industry standards.
7.What is the process for return or replacement of OPA337NA/3K?
All OPA337NA/3K units undergo pre-shipment inspection (PSI). If there is an issue with OPA337NA/3K, 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 OPA337NA/3K part is unused and in its original packaging.
Return procedure for OPA337NA/3K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA337NA/3K Tags
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