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Texas Instruments OPA338NA/250
- Part No.:
- OPA338NA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA338NA/250.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:374
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Product details
Overview
OPA338NA/250 from Texas Instruments is a single, rail-to-rail output CMOS operational amplifier optimized for gain ≥5, packaged in SOT23-5. It delivers 12.5MHz gain-bandwidth, 4.6V/µs slew rate, 120dB open-loop gain, 10pA max input bias current, and operates from 2.5V to 5.5V single supply - ideal for photodiode pre-amplification in battery-powered medical instruments.
For engineers reviewing the OPA338NA/250 datasheet, OPA338NA/250 pinout, OPA338NA/250 application, or OPA338NA/250 equivalent, key selection considerations include its G ≥5 stability requirement, FET-input low-noise performance, rail-to-rail output swing down to 40mV from rails (RL = 25kΩ), micro-power quiescent current of 525µA, and compatibility with space-constrained SOT23-5 layouts.
Technical Context
The OPA338NA/250 uses advanced CMOS process technology to achieve high-speed operation while maintaining ultra-low input bias current and rail-to-rail output swing. Its internal compensation is optimized for closed-loop gains of 5 or greater, enabling stable 12.5MHz bandwidth without external phase compensation in compliant configurations.
Input common-mode range extends from (V−) − 0.2V to (V+) − 1.2V, supporting true single-supply operation with ground-referenced inputs. The amplifier maintains 100dB open-loop gain at 5kΩ load and exhibits 0.0035% THD+N at 1kHz with 3VPP output under G = 5 conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 12.5MHz at G = 5 - enables stable high-frequency signal conditioning in sensor front-ends and ADC drivers. |
| Slew Rate | 4.6V/µs at G = 5 - supports fast transient response in audio and test equipment signal paths. |
| Input Bias Current | ≤10pA max - preserves signal integrity in high-impedance photodiode and piezoelectric sensor interfaces. |
| Open-Loop Gain | 120dB typical - ensures precision DC accuracy and low gain error in closed-loop configurations. |
| Supply Voltage Range | 2.5V to 5.5V - allows direct integration into 3.3V and 5V battery-powered systems without regulation. |
| Quiescent Current | 525µA per amplifier - enables multi-channel, low-power portable instrumentation with extended runtime. |
| Output Swing | 40mV from rail (RL = 25kΩ) - maximizes dynamic range in single-supply data acquisition systems. |
Pinout & Package
SOT23-5 surface-mount package (Package Designator: DBV), 5-pin, moisture sensitivity level 2, rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive power supply connection - must be bypassed with 0.01µF ceramic capacitor near pin. |
| 2 | −In | Inverting input - high-impedance CMOS node; sensitive to PCB leakage and ESD. |
| 3 | Out | Amplifier output - rail-to-rail capable; drives capacitive loads up to 100pF stably at G ≥5. |
| 4 | V− | Negative power supply (ground in single-supply use) - return path for quiescent and output current. |
| 5 | +In | Non-inverting input - referenced to V−; supports input common-mode down to −0.2V below V−. |
Key Features
| Feature | Design Value |
|---|---|
| G ≥5 stability | Eliminates need for external compensation in gain-5+ circuits, reducing BOM count and layout area. |
| Rail-to-rail output | Delivers full 2.5V–5.5V supply dynamic range - critical for maximizing SNR in low-voltage ADC drivers. |
| FET-input architecture | 10pA max IB enables >1GΩ source impedance interfacing without significant DC error or drift. |
| Low 525µA quiescent current | Supports always-on sensor monitoring in wearable and implantable medical devices with coin-cell batteries. |
| Single-supply operation from 2.5V | Enables direct interface with Li-ion, Li-Po, and alkaline battery stacks without LDO overhead. |
Applications
| Photodiode Pre-Amplifier | Medical Instrument Front-End |
|---|---|
Use Scenario: Amplifying weak current signals from silicon photodiodes in pulse oximeters and blood analyzers. IC Role / Device Role / Timing Role: Transimpedance amplifier with high-Z input and low-noise, rail-to-rail output driving 12-bit ADCs. Use Value: 10pA input bias current minimizes dark-current-induced offset; 12.5MHz GBW supports fast optical sampling without phase lag. |
Use Scenario: Signal conditioning for ECG/EEG electrode interfaces in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-power gain stage amplifying mV-level biopotentials before filtering and digitization. Use Value: 525µA IQ extends battery life; rail-to-rail output fully utilizes 3.3V ADC reference; G ≥5 stability suits fixed-gain instrumentation topologies. |
| Battery-Powered Test Equipment | Audio System Line Driver |
Use Scenario: Portable multimeter and signal generator output stages requiring precision and low power. IC Role / Device Role / Timing Role: Buffered voltage reference and signal scaling amplifier operating from 3.3V Li-ion supply. Use Value: 120dB AOL ensures <0.01% gain error; 4.6V/µs slew rate handles 20kHz sine waves cleanly; SOT23-5 footprint saves board space. |
Use Scenario: Driving line-level outputs in Bluetooth speakers and hearing aids with minimal distortion. IC Role / Device Role / Timing Role: Unity-gain or G=2 buffer with low THD+N and wide bandwidth for full-audio spectrum fidelity. Use Value: 0.0035% THD+N at 1kHz and 12.5MHz GBW preserve harmonic integrity; rail-to-rail swing avoids clipping on 3.3V supplies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA337NA/250 | Unity-gain stable; 3MHz GBW, 1.2V/µs slew rate, same SOT23-5 package and 525µA IQ. | Preferred for G = 1 buffer, low-frequency sensor conditioning, or where phase margin at unity gain is mandatory. | Select OPA337NA/250 when gain ≤2 is required; OPA338NA/250 is unsuitable below G = 5 without external compensation. |
| MCP6001T-E/OT | Unity-gain stable; 1MHz GBW, 0.6V/µs slew rate, 100nA max IB, same SOT23-5 package and 100µA IQ. | Better suited for ultra-low-power (<150µA) applications where speed and precision are secondary to battery life. | Choose MCP6001T-E/OT for sub-100µA systems; OPA338NA/250 provides 12× higher bandwidth and 46× lower input bias current. |
Compared with OPA337NA/250 and MCP6001T-E/OT, the OPA338NA/250 delivers the highest speed and lowest input bias current in SOT23-5, making it optimal for precision, medium-speed analog signal chains where gain ≥5 is architecturally feasible.
Availability
OPA338NA/250 is available at Aetrix Electronics and suitable for photodiode pre-amplifiers, portable medical instruments, and battery-powered test equipment requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA338NA/250 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 solutions, with over 90 years of innovation in precision amplifiers and power management ICs.
The OPA338NA/250 belongs to TI's MicroAmplifier™ series, designed specifically for miniature, low-power, high-precision analog signal conditioning in space- and energy-constrained applications such as portable diagnostics and sensor nodes.
FAQ
What is the minimum stable gain for OPA338NA/250?
The OPA338NA/250 is internally compensated for stable operation only at closed-loop gains of 5 or greater. Using it at gains below 5 - including unity-gain buffer configurations - requires external compensation (e.g., capacitor networks as shown in TI's SBOS077B Figure 3) to prevent oscillation. This is a hard design constraint confirmed in the datasheet's Applications Information section.
Can OPA338NA/250 operate from a 2.5V supply?
Yes, the OPA338NA/250 is fully specified and functional from 2.5V to 5.5V single supply. Electrical characteristics including 12.5MHz GBW, 4.6V/µs slew rate, and rail-to-rail output swing are guaranteed across this entire range, enabling direct use with unregulated lithium coin cells or low-dropout battery stacks without additional regulation.
What is the input common-mode voltage range of OPA338NA/250?
The input common-mode voltage range for OPA338NA/250 is specified from (V−) − 0.2V to (V+) − 1.2V at TA = −40°C to +85°C. This allows the device to accept inputs down to 0.2V below ground in single-supply configurations - critical for interfacing with grounded sensors - while maintaining specified CMRR and offset performance.
Does OPA338NA/250 have rail-to-rail input capability?
No, the OPA338NA/250 features rail-to-rail *output* swing but not rail-to-rail *input*. Its input common-mode range excludes the positive rail by 1.2V and extends only 0.2V below the negative rail. For true rail-to-rail input operation, alternative amplifiers such as the OPA320 or TLV9061 would be required.
What is the thermal resistance (θJA) of the OPA338NA/250 package?
The OPA338NA/250 uses the SOT23-5 (DBV) package with a junction-to-ambient thermal resistance (θJA) of 200°C/W, as documented in the Absolute Maximum Ratings table of SBOS077B. This value assumes standard JEDEC 2-layer board conditions and must be factored into power dissipation calculations for continuous operation at elevated ambient temperatures.
OPA338NA/250 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:
- 4.6V/µs
- Gain Bandwidth Product:
- 12.5 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
OPA338NA/250 FAQ
1.How can I place an order for OPA338NA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA338NA/250 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 OPA338NA/250 reliable?
The price and inventory of OPA338NA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA338NA/250 is usually 5 days.
3.What payment methods are accepted for OPA338NA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA338NA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA338NA/250?
OPA338NA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA338NA/250 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 OPA338NA/250?
For technical support, including OPA338NA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA338NA/250 requirements.
6.How does Aetrix verify that OPA338NA/250 is sourced from the original manufacturer or authorized distributors?
All OPA338NA/250 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 OPA338NA/250 meets industry standards.
7.What is the process for return or replacement of OPA338NA/250?
All OPA338NA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA338NA/250, 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 OPA338NA/250 part is unused and in its original packaging.
Return procedure for OPA338NA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA338NA/250 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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