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Texas Instruments OPA338UAG4
- Part No.:
- OPA338UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA338UAG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,095
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Product details
Overview
OPA338UAG4 from Texas Instruments is a single, rail-to-rail output CMOS operational amplifier optimized for stable operation at closed-loop gains ≥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 precision photodiode pre-amplification in portable medical instruments.
For engineers reviewing the OPA338UAG4 datasheet, OPA338UAG4 pinout, OPA338UAG4 application, or OPA338UAG4 equivalent, key selection criteria include its G ≥ 5 stability requirement, SOT23-5/SO-8 package options, FET-input low-noise performance (26nV/√Hz), and rail-to-rail output swing within 125mV of rails at 25kΩ load.
Technical Context
The OPA338UAG4 uses advanced CMOS process technology to achieve ultra-low input bias current (≤10pA) while maintaining high-speed performance. Its internal compensation ensures stability only at gains ≥5, distinguishing it from unity-gain-stable OPA337 variants.
It supports true single-supply operation with input common-mode range extending to ground (−0.2V below V−) and rail-to-rail output swing (125mV from rails). The SOIC-8 package (D) enables robust thermal performance (θJA = 150°C/W) and compatibility with standard PCB assembly processes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 12.5MHz at G = 5 - enables stable amplification of signals up to ~2.5MHz in configured circuits |
| Slew Rate | 4.6V/µs - supports fast transient response in audio and ADC driver applications without distortion |
| Input Bias Current | ≤10pA max - preserves signal integrity in high-impedance sensor interfaces like photodiodes |
| Open-Loop Gain | 120dB - ensures <0.0025% gain error in precision closed-loop configurations |
| Supply Voltage Range | 2.5V to 5.5V - compatible with Li-ion, 3.3V, and 5V systems without level-shifting |
| Output Swing | Within 125mV of rails (RL = 25kΩ) - maximizes dynamic range in low-voltage data acquisition |
| Quiescent Current | 525µA per amplifier - enables battery operation for >1000 hours in µA-scale portable instruments |
Pinout & Package
OPA338UAG4 is supplied in an 8-pin SOIC (D) surface-mount package with standard 1.27mm pitch and 150°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−In) | Differential input node; accepts signal referenced to non-inverting input |
| 2 | Non-Inverting Input (+In) | Differential input node; sets reference point for feedback network |
| 3 | Output | Amplified, rail-to-rail voltage output; drives loads up to ±9mA short-circuit current |
| 4 | V− (Ground/–VS) | Negative supply terminal; must be connected to system ground or negative rail |
| 5 | NC | No connection - internally unconnected; left floating or grounded per layout best practice |
| 6 | NC | No connection - internally unconnected; left floating or grounded per layout best practice |
| 7 | V+ (+VS) | Positive supply terminal; accepts 2.5V–5.5V single supply or split-rail configuration |
| 8 | NC | No connection - internally unconnected; left floating or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| G ≥ 5 stability | Guaranteed phase margin <45° only when closed-loop gain is 5 or higher - prevents oscillation in high-speed designs |
| Rail-to-rail output | Swings within 125mV of V+ and V− at 25kΩ load - preserves full signal headroom in 3.3V systems |
| FET input stage | 10pA max input bias current - avoids loading errors in MΩ-range sensor networks and photodiode transimpedance amps |
| Low noise density | 26nV/√Hz at 1kHz - minimizes contribution to total integrated noise in bandwidth-limited instrumentation |
| Single-supply operation | Input common-mode includes ground (−0.2V to V+−1.2V) - eliminates need for dual supplies in portable equipment |
Applications
| Photodiode Pre-Amplifier | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Amplifying weak current from reverse-biased photodiodes in pulse oximeters or environmental light sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal input loading and offset drift. Use Value: 10pA input bias current prevents signal attenuation; rail-to-rail output maximizes ADC utilization in 3.3V systems. |
Use Scenario: Signal conditioning front-end in handheld multimeters or portable ECG monitors. IC Role / Device Role / Timing Role: Low-power, precision gain stage interfacing sensors to µC ADCs under intermittent power management. Use Value: 525µA quiescent current extends battery life; 2.5V minimum supply enables direct Li-ion (3.0–4.2V) operation. |
| Medical Instrumentation | Audio System Front-End |
Use Scenario: Biopotential amplification in low-noise EEG or EMG acquisition modules. IC Role / Device Role / Timing Role: High-input-impedance, low-THD+N buffer stage rejecting common-mode interference. Use Value: 0.0035% THD+N at 1kHz and 120dB CMRR ensure fidelity in sub-mV physiological signal chains. |
Use Scenario: Line-level signal buffering and filtering in portable DAC output stages or microphone preamps. IC Role / Device Role / Timing Role: Unity-gain or moderate-gain buffer isolating DAC output from variable cable capacitance. Use Value: 4.6V/µs slew rate prevents slew-induced distortion on 20kHz audio transients; SOIC-8 eases hand-soldering during prototyping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA338UA | Identical electrical specs and SOIC-8 packaging; differs only in tape-and-reel vs tube packaging and marking (OPA338UA vs OPA338UAG4) | Same functional use; OPA338UAG4 is tube-packaged with G4 suffix indicating RoHS-compliant NiPdAu lead finish | Select OPA338UAG4 for manual assembly, small-batch prototyping, or legacy BOM continuity requiring tube delivery |
| OPA337UA | Unity-gain stable (G = 1), lower GBW (3MHz), slower slew rate (1.2V/µs), same SOIC-8 package and supply range | Suitable for general-purpose buffering where gain ≥5 is not required; less suitable for high-speed photodiode or audio applications | Choose OPA337UA only when unity-gain stability is mandatory and bandwidth/slew rate requirements are relaxed |
Compared with OPA338UA, OPA338UAG4 offers identical performance in tube packaging for prototyping; versus OPA337UA, it provides 4.2× higher bandwidth and 3.8× faster slew rate but requires minimum gain of 5 - critical for high-fidelity, high-speed signal conditioning.
Availability
OPA338UAG4 is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode pre-amplifiers, and medical signal conditioning requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for OPA338UAG4 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 over 90 years of innovation in precision analog ICs.
The OPA338 series belongs to TI's MicroAmplifier™ portfolio, designed specifically for space-constrained, low-power, high-precision applications including portable medical devices and sensor signal chains.
FAQ
What is the minimum stable gain for OPA338UAG4?
The OPA338UAG4 is optimized for closed-loop gains greater than or equal to 5. It is not unity-gain stable; attempting G = 1 will result in instability and potential oscillation. Compensation techniques exist for lower gains, but require external capacitors and careful frequency-domain analysis per the datasheet Application Information section.
Does OPA338UAG4 support rail-to-rail input operation?
No - the OPA338UAG4 features rail-to-rail *output* swing but has a limited input common-mode range of (V−) − 0.2V to (V+) − 1.2V. Inputs must stay within this window for linear operation; exceeding it may cause phase inversion or increased distortion, though the device remains undamaged per absolute maximum ratings.
What package type and markings identify OPA338UAG4?
OPA338UAG4 is supplied in an 8-pin SOIC (D) package with tube packaging (75 units/tube), RoHS-compliant NiPdAu lead finish, and part marking "OPA 338UA" on the top surface. The "G4" suffix denotes the specific environmental and finishing specification per TI's ordering nomenclature.
Can OPA338UAG4 operate from a 2.5V supply?
Yes - the OPA338UAG4 is fully specified for operation from 2.5V to 5.5V single supply. All key parameters including gain-bandwidth, slew rate, and output swing remain valid across this range, making it suitable for direct integration with Li-ion batteries and ultra-low-voltage microcontrollers.
How does OPA338UAG4 differ from OPA338NA/3K?
OPA338UAG4 uses SOIC-8 packaging (D) and tube delivery, while OPA338NA/3K uses SOT23-5 packaging (DBV) and 3000-unit tape-and-reel. Electrically identical, they differ in footprint, thermal performance (θJA = 150°C/W vs 200°C/W), board area, and assembly method - OPA338UAG4 suits through-hole-compatible or manual assembly; OPA338NA/3K targets ultra-compact, automated production.
OPA338UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
OPA338UAG4 FAQ
1.How can I place an order for OPA338UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA338UAG4 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 OPA338UAG4 reliable?
The price and inventory of OPA338UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA338UAG4 is usually 5 days.
3.What payment methods are accepted for OPA338UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA338UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA338UAG4?
OPA338UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA338UAG4 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 OPA338UAG4?
For technical support, including OPA338UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA338UAG4 requirements.
6.How does Aetrix verify that OPA338UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA338UAG4 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 OPA338UAG4 meets industry standards.
7.What is the process for return or replacement of OPA338UAG4?
All OPA338UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA338UAG4, 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 OPA338UAG4 part is unused and in its original packaging.
Return procedure for OPA338UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA338UAG4 Tags
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