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Texas Instruments OPA2345EA/250
- Part No.:
- OPA2345EA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2345EA/250.pdf
- Description:
- IC CMOS 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:368
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Product details
Overview
OPA2345EA/250 from Texas Instruments is a dual, rail-to-rail input/output CMOS operational amplifier optimized for gains ≥5 and single-supply operation from 2.7V to 5.5V. It delivers 3MHz gain-bandwidth, 2V/µs slew rate, 150µA typical quiescent current per amplifier, and output swing within 1mV of rails (RL = 100kΩ). It is used in precision data acquisition front-ends driving sampling ADCs like ADS7822.
For engineers reviewing the OPA2345EA/250 datasheet, OPA2345EA/250 pinout, OPA2345EA/250 application, or OPA2345EA/250 equivalent, key selection criteria include gain-bandwidth stability at G ≥ 5, rail-to-rail dynamic range in low-voltage systems, THD+N of 0.006% at 1kHz, microsize MSOP-8 packaging, and guaranteed –40°C to +85°C operation.
Technical Context
The OPA2345EA/250 implements a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 300mV beyond both supply rails, with a defined transition region where both N- and P-channel pairs operate. Its class AB output stage achieves 1mV rail-to-rail swing under light loads while maintaining ≥96dB open-loop gain.
Designed for non-unity-gain stability, it requires minimum closed-loop gain of 5 to ensure phase margin and settle in 1.5µs (0.1%) for a 2V step. Its 3MHz GBW and 2V/µs slew rate support medium-speed signal conditioning without oscillation in properly compensated G ≥ 5 configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports stable amplification up to 300kHz at G = 10, critical for anti-aliasing filter design before ADC sampling. |
| Slew Rate | 2V/µs - enables faithful reproduction of 318kHz full-scale 5V sine waves without slew-induced distortion. |
| Input Offset Voltage | ±0.2mV (typ) - contributes ≤0.004% error in 5V full-scale 12-bit systems (LSB = 1.22mV). |
| THD + Noise | 0.006% at 1kHz, G = 5 - meets high-fidelity audio and precision measurement requirements. |
| Quiescent Current | 150µA per amplifier (typ) - allows dual-channel operation below 300µA total, suitable for battery-powered data loggers. |
| Rail-to-Rail Output Swing | Within 1mV of V+ and V– (RL = 100kΩ) - maximizes usable dynamic range in 3.3V or 5V single-supply systems. |
| Common-Mode Range | –0.3V to (V+) + 0.3V - accepts inputs below ground or above supply, simplifying sensor interfacing without level-shifting. |
Pinout & Package
OPA2345EA/250 is packaged in an 8-pin MSOP (VSSOP) package (DGK drawing), 3.0mm × 3.0mm footprint, 0.65mm pitch, RoHS-compliant, moisture sensitivity level 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives external load or ADC input; rail-to-rail swing enables full utilization of ADC reference voltage. |
| 2 (–IN A) | Inverting input A | Accepts feedback network; high impedance (10¹³ Ω) minimizes loading on precision resistor dividers. |
| 3 (+IN A) | Non-inverting input A | Connects to sensor or reference; common-mode range extends beyond rails for direct single-supply transducer interfacing. |
| 4 (V–) | Negative supply | Typically ground in single-supply systems; must be bypassed with 0.01µF ceramic capacitor near pin. |
| 5 (V+) | Positive supply | Accepts 2.7V–5.5V; bypassing required to maintain PSRR >130dB at 1kHz and prevent oscillation. |
| 6 (+IN B) | Non-inverting input B | Enables dual-channel signal paths (e.g., differential input stage or independent sensor channels). |
| 7 (–IN B) | Inverting input B | Supports matched dual configuration; identical specs to Channel A ensure channel-to-channel tracking. |
| 8 (OUT B) | Amplifier B output | Independent output for second signal path; no crosstalk degradation (channel separation >130dB at dc). |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Extends usable input range to –0.3V–(V+)+0.3V and output swing to within 1mV of rails-preserves >99.9% of 3.3V or 5V supply headroom. |
| G ≥ 5 optimized stability | Guaranteed phase margin and 1.5µs 0.1% settling at gain ≥5 eliminates need for external compensation in most medium-speed applications. |
| Ultra-low quiescent current | 150µA per amplifier enables dual-channel operation at <300µA total-critical for multi-day battery life in portable instrumentation. |
| Low THD+N (0.006%) | Meets Class A audio and 12-bit+ data acquisition SNR requirements without post-processing correction. |
| High CMRR (92dB typ) | Maintains accuracy in noisy industrial environments where common-mode interference exceeds 100mV. |
Applications
| PCMCIA Data Acquisition Card | Speech Bandpass Filter System |
|---|---|
|
Use Scenario: Compact PCMCIA card acquiring analog sensor signals in field-deployed test equipment. IC Role / Device Role / Timing Role: Dual op-amp buffers and gain stages condition electret microphone and thermistor outputs before 12-bit ADC sampling. Use Value: MSOP-8 footprint saves PCB area; 300µA total supply current extends battery runtime; rail-to-rail swing maximizes ADC code utilization across 2.7–5.5V supply range. |
Use Scenario: Low-cost speech processing front-end filtering 300Hz–3kHz band for voice recognition modules. IC Role / Device Role / Timing Role: One amplifier configures as active bandpass filter, the other as ADC driver with I/V conversion for electret bias. Use Value: Dual-channel integration eliminates inter-stage matching errors; 0.006% THD+N preserves speech intelligibility; 2V/µs slew rate handles transient phonemes without distortion. |
| Industrial Process Control Loop | Portable Test Equipment Signal Conditioning |
|
Use Scenario: 4–20mA loop transmitter with local sensor signal conditioning and isolation interface. IC Role / Device Role / Timing Role: Amplifier A conditions RTD bridge output; Amplifier B drives DAC output for loop current control. Use Value: ±0.2mV offset ensures <0.01% FSR error in 16-bit control resolution; rail-to-rail output drives DAC reference precisely; 130dB PSRR rejects power supply noise. |
Use Scenario: Handheld multimeter or oscilloscope probe amplifier requiring precision, low power, and compact size. IC Role / Device Role / Timing Role: Dual amplifier provides programmable gain (×1/×10/×100) and ADC input buffering in single chip. Use Value: Identical specs per channel guarantee gain accuracy across ranges; 3MHz GBW supports >100kHz bandwidth in ×1 mode; 150µA current enables >10-hour operation on coin cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual rail-to-rail operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2344EA/250 | Unity-gain stable; 1MHz GBW; 0.8V/µs slew rate; same pinout and package. | Better suited for G = 1 buffer or low-frequency (<100kHz) applications; lower power but reduced speed. | Select OPA2344EA/250 when unity-gain stability is mandatory and bandwidth <1MHz suffices. |
| MCP6022-E/SN | 2.5V–6.0V operation; 10MHz GBW; 3.5V/µs slew rate; SOIC-8 only; higher IQ (1mA). | Higher speed and drive capability, but consumes >3× more current and lacks guaranteed rail-to-rail output swing within 1mV. | Choose MCP6022-E/SN only when >3MHz bandwidth is required and power budget allows 2mA per channel. |
Compared with OPA2344EA/250, the OPA2345EA/250 trades unity-gain stability for 3× higher bandwidth and 2.5× faster slew rate-ideal for G ≥ 5 signal chains. Against MCP6022-E/SN, it offers superior rail-to-rail precision and 6.7× lower quiescent current, at the cost of bandwidth.
Availability
OPA2345EA/250 is available at Aetrix Electronics and suitable for PCMCIA cards, speech processing systems, industrial process controllers, and portable test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2345EA/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 delivering analog and embedded processing solutions, with over 50 years of innovation in precision amplifiers and data converters.
The OPA2345EA/250 belongs to TI's MicroAmplifier™ series, designed specifically for low-power, miniature, single-supply precision signal conditioning in space-constrained and battery-operated applications.
FAQ
What is the minimum stable gain for OPA2345EA/250?
The OPA2345EA/250 is optimized for closed-loop gains of 5 or greater and is not unity-gain stable. Attempting G = 1 will result in peaking or oscillation due to its internal compensation. For unity-gain applications, use the pin-compatible OPA2344EA/250 instead. The 3MHz gain-bandwidth product is specified and guaranteed only for G ≥ 5 configurations.
Does OPA2345EA/250 support true rail-to-rail output swing?
Yes, the OPA2345EA/250 delivers rail-to-rail output swing within 1mV of both V+ and V– when driving high-impedance loads (RL ≥ 100kΩ), as confirmed by TI's SBOS107A datasheet Figure 5 and specification table. This performance is maintained across the full –40°C to +85°C temperature range and enables maximum dynamic range in 3.3V or 5V systems.
Can OPA2345EA/250 drive capacitive loads directly?
The OPA2345EA/250 can directly drive up to 250pF of pure capacitive load when configured with gain ≥ 5, per TI's application note. At unity gain, instability may occur; however, this configuration is not recommended. For G ≥ 5, no external isolation resistor is needed-simplifying layout and preserving signal integrity in ADC driver applications.
What is the input common-mode voltage range of OPA2345EA/250?
The OPA2345EA/250 features a rail-to-rail input stage with a common-mode voltage range from –0.3V to (V+) + 0.3V, verified across the full operating temperature range. This allows direct interfacing with sensors whose outputs swing below ground or above the positive supply-eliminating level-shifting circuitry in single-supply designs.
Is OPA2345EA/250 suitable for driving the ADS7822 ADC?
Yes, the OPA2345EA/250 is explicitly validated in TI's SBOS107A datasheet (Figure 7) for driving the ADS7822 12-bit sampling ADC in speech bandpass systems. Its 2V/µs slew rate, 3MHz GBW, rail-to-rail output, and low THD+N (0.006%) ensure accurate charge injection buffering and minimal distortion in the 300Hz–3kHz voice band.
OPA2345EA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 150µA (x2 Channels)
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
OPA2345EA/250 FAQ
1.How can I place an order for OPA2345EA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2345EA/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 OPA2345EA/250 reliable?
The price and inventory of OPA2345EA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2345EA/250 is usually 5 days.
3.What payment methods are accepted for OPA2345EA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2345EA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2345EA/250?
OPA2345EA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2345EA/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 OPA2345EA/250?
For technical support, including OPA2345EA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2345EA/250 requirements.
6.How does Aetrix verify that OPA2345EA/250 is sourced from the original manufacturer or authorized distributors?
All OPA2345EA/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 OPA2345EA/250 meets industry standards.
7.What is the process for return or replacement of OPA2345EA/250?
All OPA2345EA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2345EA/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 OPA2345EA/250 part is unused and in its original packaging.
Return procedure for OPA2345EA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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