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Texas Instruments OPA338UA/2K5
- Part No.:
- OPA338UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA338UA/2K5.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,309
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Product details
Overview
OPA338UA/2K5 from Texas Instruments is a single, rail-to-rail output CMOS operational amplifier optimized for non-inverting or inverting gain ≥5 configurations. 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 precision signal conditioning in battery-powered instrumentation and ADC driver stages.
For engineers reviewing the OPA338UA/2K5 datasheet, OPA338UA/2K5 pinout, OPA338UA/2K5 application, or OPA338UA/2K5 equivalent, key selection criteria include its G ≥ 5 stability requirement, SOT23-5 package footprint, rail-to-rail output swing (≤125mV from rails at 25kΩ), low quiescent current (525µA), and FET-input performance for high-impedance sensor interfaces.
Technical Context
The OPA338UA/2K5 uses advanced CMOS process technology to achieve ultra-low input bias current (±10pA max) while maintaining high-speed operation. Its internal compensation is optimized for closed-loop gains of 5 or greater, enabling stable 12.5MHz bandwidth without external 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. Output stage delivers rail-to-rail swing with ≤125mV headroom at 25kΩ load and maintains 100dB open-loop gain across 2.7V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 12.5MHz at G = 5 - enables stable high-frequency amplification in sensor front-ends and active filters |
| Slew Rate | 4.6V/µs at G = 5 - supports fast transient response in data acquisition and audio line drivers |
| Input Bias Current | ±10pA max - preserves signal integrity in photodiode preamps and high-Z electrode interfaces |
| Supply Voltage Range | 2.5V to 5.5V - compatible with Li-ion, coin-cell, and 3.3V/5V system rails without level-shifting |
| Quiescent Current | 525µA per amplifier - enables multi-channel, always-on monitoring in portable medical devices |
| Open-Loop Gain | 120dB typ - ensures <0.001% gain error in precision gain blocks and reference buffers |
| Output Swing | ≤125mV from rail at 25kΩ - maximizes dynamic range in single-supply 12-bit+ ADC driver applications |
Pinout & Package
OPA338UA/2K5 is housed in a 5-pin SOT23-5 surface-mount package (package designator DBV), measuring 2.9mm × 1.6mm × 1.1mm with 0.95mm pitch. Thermal resistance θJA is 200°C/W.
| 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 GND |
| 2 (−In) | Inverting input | High-impedance FET node; bias current ≤10pA enables direct connection to photodiodes or pH electrodes |
| 3 (Out) | Amplifier output | Rail-to-rail capable; drives 25kΩ loads to within 125mV of V+ or V−; stable only at G ≥ 5 |
| 4 (V−) | Negative supply rail / Ground | Typically connected to system GND in single-supply operation; supports input common-mode down to −0.2V |
| 5 (+In) | Non-inverting input | High-impedance FET node; common-mode range includes ground-enables true single-supply sensor biasing |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full-scale signal headroom in 3.3V systems-critical for maximizing SNR in 12-bit+ ADC interfaces |
| G ≥ 5 internal compensation | Eliminates need for external compensation in gain-of-5+ circuits, reducing BOM count and layout area |
| FET-input architecture | Enables >1013Ω input impedance-preserves signal fidelity in piezoelectric, electret mic, and bio-sensor front-ends |
| Low 525µA quiescent current | Supports continuous operation in battery-powered instruments with >1-year shelf life on CR2032 cells |
| 2.5V minimum operating voltage | Allows direct interface with low-voltage microcontrollers and energy-harvesting power supplies |
Applications
| Battery-Powered Instruments | Photodiode Pre-Amps |
|---|---|
Use Scenario: Portable multimeter front-end amplifying µV-level thermocouple or shunt voltage signals. IC Role / Device Role / Timing Role: Precision DC-coupled gain block with low offset drift and rail-to-rail output driving SAR ADC reference buffer. Use Value: 120dB open-loop gain ensures <0.001% gain error; 525µA IQ extends battery life beyond 500 hours at 100ksps sampling. | Use Scenario: Low-noise transimpedance amplifier converting pA-level photocurrent from silicon photodiodes. IC Role / Device Role / Timing Role: High-Z current-to-voltage converter with 10pA max input bias minimizing dark-current error. Use Value: FET input and 26nV/√Hz voltage noise enable sub-pW optical detection sensitivity in spectrophotometers. |
| Medical Instruments | Driving ADCs |
Use Scenario: ECG lead amplifier stage capturing mV-level cardiac signals with high common-mode rejection. IC Role / Device Role / Timing Role: Single-supply instrumentation amplifier input stage with rail-to-rail output feeding anti-alias filter. Use Value: Input common-mode range including ground allows direct electrode biasing; 74dB CMRR minimizes 50/60Hz interference. | Use Scenario: Buffering and level-shifting analog sensor outputs to match 12-bit ADC input range. IC Role / Device Role / Timing Role: Gain-of-5 driver ensuring full-scale swing into ADC sample-and-hold capacitor without clipping. Use Value: 12.5MHz GBW and 4.6V/µs slew rate settle 2V steps in ≤1.4µs (0.1%), meeting 1MSPS ADC timing budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA337UA/2K5 | Unity-gain stable; 3MHz GBW, 1.2V/µs slew rate, same SOT23-5 package and pinout | Preferred for G = 1 buffer or low-gain (<5) signal conditioning where stability without compensation is required | Select OPA337UA/2K5 when circuit gain is <5 or unity-gain buffering is needed; OPA338UA/2K5 is unsuitable below G = 5 |
| MCP6001T-E/OT | Unity-gain stable; 1MHz GBW, 0.6V/µs slew rate, 100µA IQ, same SOT23-5 footprint | Better suited for ultra-low-power wake-up sensors or always-on comparators where speed is secondary to current draw | Choose MCP6001T-E/OT for sub-200µA systems; OPA338UA/2K5 provides 12× higher bandwidth at 2.6× higher IQ |
Compared with OPA337UA/2K5 and MCP6001T-E/OT, the OPA338UA/2K5 delivers 4.2× higher bandwidth and 3.8× faster slew rate at the cost of requiring minimum gain ≥5-making it optimal for high-fidelity, moderate-power signal chains where speed and precision outweigh ultra-low-IQ requirements.
Availability
OPA338UA/2K5 is available at Aetrix Electronics and suitable for battery-powered instruments, photodiode pre-amplifiers, and medical instrumentation requiring stable component supply with guaranteed long-term sourcing.
Supply support for OPA338UA/2K5 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The OPA338 series belongs to TI's MicroAmplifier™ portfolio, designed specifically for space-constrained, low-voltage, high-precision applications where rail-to-rail output, FET input, and G ≥ 5 stability enable compact, high-performance analog signal chains.
FAQ
What is the minimum stable gain for OPA338UA/2K5?
The OPA338UA/2K5 is internally compensated for stable operation only at closed-loop gains of 5 or greater. Using it at gains below 5-such as unity-gain buffer or gain-of-2 configurations-requires external compensation (e.g., capacitor network per Figure 3 in SBOS077B) to prevent oscillation. The OPA338UA/2K5 datasheet explicitly states "G ≥ 5 STABLE" as a design constraint.
Does OPA338UA/2K5 support true single-supply operation with ground-referenced inputs?
Yes. The OPA338UA/2K5 features an input common-mode voltage range extending from (V−) − 0.2V to (V+) − 1.2V. When V− is connected to ground, inputs can swing down to −0.2V-enabling direct interface with grounded sensors like electret microphones or resistive bridges without level-shifting circuitry. This is confirmed in the Electrical Characteristics table under "Common-Mode Voltage Range."
What is the maximum capacitive load OPA338UA/2K5 can drive without instability?
The OPA338UA/2K5 datasheet does not specify a hard maximum capacitive load, but typical characterization shows stable step response up to 100pF with G = 5 (Figure 7). For loads >100pF, isolation resistor (e.g., 10–100Ω) between output and capacitance is recommended. Driving heavy capacitive loads (>500pF) requires careful layout and may necessitate external compensation per Application Information section.
Can OPA338UA/2K5 be used in photodiode transimpedance applications?
Yes-the OPA338UA/2K5 is well-suited for photodiode TIA designs due to its 10pA max input bias current, 26nV/√Hz input voltage noise, and rail-to-rail output. Its FET input minimizes dark-current error, and 12.5MHz bandwidth supports fast optical pulse detection. However, ensure closed-loop gain ≥5 and use proper feedback capacitance to control bandwidth and phase margin per standard TIA design practice.
What package type and marking does OPA338UA/2K5 use?
OPA338UA/2K5 is supplied in a 5-pin SOT23-5 package (TI package designator DBV) with tape-and-reel quantity of 2500. The device marking is "A38", laser-etched on the top surface. Pin 1 is located at the lead end with notch or dimple indicator, and the package complies with JEDEC MO-178 standards with 0.95mm pin pitch and 200°C/W junction-to-ambient thermal resistance.
OPA338UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 8-SOIC
OPA338UA/2K5 FAQ
1.How can I place an order for OPA338UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA338UA/2K5 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 OPA338UA/2K5 reliable?
The price and inventory of OPA338UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA338UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA338UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA338UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA338UA/2K5?
OPA338UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA338UA/2K5 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 OPA338UA/2K5?
For technical support, including OPA338UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA338UA/2K5 requirements.
6.How does Aetrix verify that OPA338UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA338UA/2K5 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 OPA338UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA338UA/2K5?
All OPA338UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA338UA/2K5, 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 OPA338UA/2K5 part is unused and in its original packaging.
Return procedure for OPA338UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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