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Texas Instruments OPA2338EA/3KG4
- Part No.:
- OPA2338EA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2338EA/3KG4.pdf
- Description:
- IC CMOS 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,868
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Product details
Overview
OPA2338EA/3KG4 from Texas Instruments is a dual, rail-to-rail output CMOS operational amplifier in SOT23-8 package, optimized for G ≥ 5 stable operation with 12.5MHz gain-bandwidth product, 4.6V/µs slew rate, and 525µA per amplifier quiescent current. It operates from 2.5V to 5.5V single supply and delivers high open-loop gain (120dB) and ultra-low input bias current (10pA max), enabling precision signal conditioning in space-constrained battery-powered instruments.
For engineers reviewing the OPA2338EA/3KG4 datasheet, OPA2338EA/3KG4 pinout, OPA2338EA/3KG4 application, or OPA2338EA/3KG4 equivalent, key selection criteria include its G ≥ 5 stability requirement, SOT23-8 footprint compatibility, rail-to-rail output swing (125mV from rails at 25kΩ), FET-input performance for photodiode pre-amplification, and low-noise operation (26nV/√Hz) in medical and test equipment signal chains.
Technical Context
The OPA2338EA/3KG4 implements a CMOS input stage with independent dual amplifiers, supporting rail-to-rail output swing and input common-mode range extending to ground. Its internal compensation ensures stability only at closed-loop gains ≥ 5, distinguishing it from the unity-gain-stable OPA2337 series.
It features low-power design with 525µA per amplifier quiescent current, 12.5MHz GBW at G = 5, and 4.6V/µs slew rate-enabling high-fidelity signal amplification in audio systems and ADC driver applications without phase inversion or overload recovery issues.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 12.5MHz at G = 5 - enables stable high-frequency amplification in instrumentation filters and active anti-aliasing stages |
| Slew Rate | 4.6V/µs at G = 5 - supports fast transient response for driving 12-bit ADCs with minimal distortion |
| Input Bias Current | ≤10pA max - preserves signal integrity in high-impedance photodiode and sensor interfaces |
| Supply Voltage Range | 2.5V to 5.5V - allows direct integration into 3.3V and 5V battery-powered systems without level-shifting |
| Open-Loop Gain | 120dB - ensures <0.001% gain error in precision gain blocks and reference buffers |
| Quiescent Current | 525µA per amplifier - enables dual-channel amplification in micropower data acquisition with <1.1mA total draw |
| Output Swing | 125mV from rail (25kΩ load) - maximizes dynamic range in single-supply 3.3V systems |
Pinout & Package
SOT23-8 surface-mount package (DCN designator), 2.9mm × 2.8mm footprint, 1.45mm height, MSL Level-1 (UNLIM reflow), lead finish NIPDAU.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply rail connection for both amplifiers; must be bypassed with 0.01µF ceramic capacitor |
| 2 | Out B | Output of second amplifier channel; rail-to-rail swing supports full-scale ADC input drive |
| 3 | −In B | Inverting input of second amplifier; high impedance (10¹³Ω) minimizes loading on feedback networks |
| 4 | +In B | Non-inverting input of second amplifier; includes ground in common-mode range for true single-supply operation |
| 5 | Out A | Output of first amplifier channel; electrically isolated from Out B to ensure <0.3µV/V crosstalk |
| 6 | −In A | Inverting input of first amplifier; matched to −In B for differential pair configurations |
| 7 | +In A | Non-inverting input of first amplifier; identical electrical characteristics to +In B |
| 8 | V− | Negative supply rail (typically ground); shared return path for both amplifiers with low-impedance layout critical |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full 0–V+ output range at 25kΩ load, maximizing usable dynamic range in 3.3V systems |
| G ≥ 5 stability optimization | Enables higher bandwidth (12.5MHz) and faster slew (4.6V/µs) than unity-gain alternatives, with no external compensation required at G = 5 |
| FET-input architecture | 10pA max input bias current enables accurate amplification of nanoamp-level photodiode currents without offset drift |
| Dual independent amplifiers | Zero interaction between channels even under overload, ensuring reliable performance in multi-sensor front-ends |
| Single-supply operation from 2.5V | Eliminates need for split supplies in portable medical devices and handheld test equipment |
Applications
| Battery-Powered Instruments | Photodiode Pre-Amps |
|---|---|
Use Scenario: Portable pH meters and handheld multimeters requiring low-power, high-accuracy analog front-ends. IC Role / Device Role / Timing Role: Dual-channel signal conditioning amplifier for sensor excitation and measurement paths. Use Value: 525µA per amplifier quiescent current extends battery life; rail-to-rail output drives ADCs directly without level-shifting. | Use Scenario: Optical smoke detectors and spectrophotometers measuring weak photocurrents from silicon photodiodes. IC Role / Device Role / Timing Role: Transimpedance amplifier with ultra-low input bias current to convert pA-level photocurrent to voltage. Use Value: ≤10pA input bias current prevents signal corruption; high open-loop gain (120dB) ensures stable transimpedance gain accuracy. |
| Medical Instruments | Driving ADCs |
Use Scenario: ECG front-end modules in wearable patient monitors where size and power are critical constraints. IC Role / Device Role / Timing Role: Dual op amp providing simultaneous low-noise amplification and filtering of biopotential signals. Use Value: SOT23-8 package occupies 1/4 area of SO-8; 26nV/√Hz input noise preserves microvolt-level ECG signal fidelity. | Use Scenario: Precision data acquisition systems using 12-bit SAR ADCs like ADS7822 requiring clean, fast-settling drive signals. IC Role / Device Role / Timing Role: Buffer and gain stage preceding ADC input to maintain linearity and reduce settling time. Use Value: 4.6V/µs slew rate and 1.4µs 0.1% settling time (G = 5) enable full-scale updates at >500ksps without distortion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual CMOS op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2337EA/3K | Unity-gain stable; 3MHz GBW, 1.2V/µs slew rate, same SOT23-8 package | Preferred for G = 1 buffer or low-gain (<5) signal conditioning where bandwidth <3MHz suffices | Select OPA2337EA/3K when stability at unity gain is required and lower speed is acceptable |
| MCP6022-E/SN | Unity-gain stable; 10MHz GBW, 2.2V/µs slew rate; 2.7V–5.5V supply; SO-8 package | Higher supply voltage minimum (2.7V vs 2.5V); not available in SOT23-8; slightly higher quiescent current (1mA) | Choose MCP6022-E/SN when SO-8 footprint is acceptable and unity-gain operation with 10MHz bandwidth is needed |
Compared with OPA2337EA/3K and MCP6022-E/SN, the OPA2338EA/3KG4 provides 4.2× higher bandwidth and 2.1× faster slew rate at G ≥ 5, but requires minimum gain configuration-making it optimal for high-speed, space-constrained dual-channel gain blocks where unity-gain stability is not mandatory.
Availability
OPA2338EA/3KG4 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 OPA2338EA/3KG4 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 specializing in analog and embedded processing technologies, with leadership in precision amplifiers and low-power signal chain solutions.
The OPA2338EA/3KG4 belongs to TI's MicroAmplifier™ series, designed specifically for miniature, low-cost, single-supply applications demanding rail-to-rail output, ultra-low input bias current, and high-speed performance in ultra-small packages.
FAQ
What is the minimum stable gain for OPA2338EA/3KG4?
The OPA2338EA/3KG4 is optimized for closed-loop gains greater than or equal to 5. It is not unity-gain stable; attempting G = 1 operation without external compensation will cause instability and oscillation. The device achieves 12.5MHz bandwidth and 4.6V/µs slew rate only when configured for G ≥ 5, as verified in the SBOS077B datasheet.
What package type does OPA2338EA/3KG4 use?
OPA2338EA/3KG4 uses the SOT23-8 surface-mount package (TI package designator DCN), measuring 2.9mm × 2.8mm with 1.45mm height. This micro-size package is 1/4 the area of a standard SO-8 and supports tape-and-reel delivery in 3000-unit reels, as confirmed by TI's PACKAGE OPTION ADDENDUM.
Does OPA2338EA/3KG4 support single-supply operation?
Yes, OPA2338EA/3KG4 supports true single-supply operation from 2.5V to 5.5V. Its input common-mode range extends to ground (V− − 0.2V), and output swings rail-to-rail within 125mV of both supply rails at 25kΩ load-enabling direct interface with 3.3V microcontrollers and ADCs without level-shifting circuitry.
What is the input bias current specification for OPA2338EA/3KG4?
The input bias current for OPA2338EA/3KG4 is specified as ±10pA maximum over the full −40°C to +85°C temperature range. This ultra-low value is enabled by its CMOS input stage and makes the device suitable for high-impedance sensor interfaces such as photodiode transimpedance amplifiers, where leakage current would otherwise dominate signal accuracy.
Can OPA2338EA/3KG4 drive capacitive loads?
OPA2338EA/3KG4 can drive moderate capacitive loads, but stability depends on gain configuration and external compensation. The datasheet shows typical overshoot vs load capacitance curves for G = ±5, indicating stable operation up to ~100pF without compensation. For larger loads or lower gains, external compensation (e.g., Figure 3 in SBOS077B) is required to maintain phase margin and prevent ringing.
OPA2338EA/3KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- 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 (x2 Channels)
- 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-23-8
OPA2338EA/3KG4 FAQ
1.How can I place an order for OPA2338EA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2338EA/3KG4 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 OPA2338EA/3KG4 reliable?
The price and inventory of OPA2338EA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2338EA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA2338EA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2338EA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2338EA/3KG4?
OPA2338EA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2338EA/3KG4 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 OPA2338EA/3KG4?
For technical support, including OPA2338EA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2338EA/3KG4 requirements.
6.How does Aetrix verify that OPA2338EA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA2338EA/3KG4 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 OPA2338EA/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA2338EA/3KG4?
All OPA2338EA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2338EA/3KG4, 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 OPA2338EA/3KG4 part is unused and in its original packaging.
Return procedure for OPA2338EA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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