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Texas Instruments OPA2345UA/2K5
- Part No.:
- OPA2345UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2345UA/2K5.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,369
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Product details
Overview
OPA2345UA/2K5 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, <1mV output swing from rails (RL = 100kΩ), 150µA typical quiescent current per amplifier, and 0.006% THD+N at 1kHz - enabling precision signal conditioning in space-constrained, low-power data acquisition systems.
For engineers reviewing the OPA2345UA/2K5 datasheet, OPA2345UA/2K5 pinout, OPA2345UA/2K5 application, or OPA2345UA/2K5 equivalent, this page provides verified package mapping (SOIC-8), confirmed dual-amplifier topology, rail-to-rail I/O behavior across full common-mode range (–0.3V to V+ + 0.3V), temperature-stable offset drift (±3µV/°C), and design-critical stability guidance for capacitive loads up to 250pF.
Technical Context
The OPA2345UA/2K5 implements a complementary CMOS input stage with parallel N-channel and P-channel differential pairs, enabling rail-to-rail input operation extending 300mV beyond supply rails. Its gain-bandwidth product of 3MHz and 2V/µs slew rate are specified for closed-loop gains ≥5, reflecting internal compensation optimized for higher-speed, moderate-gain configurations.
Output uses a class AB common-source stage capable of driving 600Ω loads while maintaining rail-to-rail swing; at light loads (>50kΩ), output voltage settles within 1mV of either rail. Quiescent current remains stable across 2.5V–5.5V supply and –40°C to +85°C ambient, supporting battery-powered and industrial embedded use.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports stable closed-loop operation at G ≥ 5 with bandwidth up to ~600kHz. |
| Slew Rate | 2V/µs - enables clean 1kHz, 2.5Vp-p output without distortion in G = 5 configuration. |
| Input Offset Voltage | ±0.2mV (typ) - ensures ≤1mV error in precision I/V conversion or sensor front-end amplification. |
| Quiescent Current | 150µA per amplifier (typ) - allows dual-channel operation under 300µA total, ideal for micro-power systems. |
| Output Swing from Rail | 1mV (RL = 100kΩ) - preserves >99.8% dynamic range when interfacing with 12-bit ADCs referenced to same supply. |
| THD + Noise | 0.006% at 1kHz - meets audio-grade signal fidelity requirements in speech bandpass filtering. |
| Common-Mode Range | –0.3V to V+ + 0.3V - permits direct sensing of signals near ground or V+ in single-supply data acquisition. |
Pinout & Package
OPA2345UA/2K5 is supplied in an 8-pin SOIC (Small Outline Integrated Circuit) package, surface-mount compatible, RoHS-compliant, with moisture sensitivity level (MSL) Level-2-260°C-1 year.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives external load or ADC input; rail-to-rail swing supports full-scale analog interface. |
| 2 | –In A | Inverting input of Amplifier A - used in inverting gain stages; common-mode voltage must stay within spec limits. |
| 3 | +In A | Non-inverting input of Amplifier A - accepts signals from sensors or filters; bias current <10pA minimizes resistor-induced errors. |
| 4 | V– | Negative supply pin - tied to ground in single-supply operation; bypass with 0.01µF ceramic capacitor. |
| 5 | Out B | Amplifier B output - independent channel for dual-path signal processing (e.g., differential drive or dual-sensor conditioning). |
| 6 | –In B | Inverting input of Amplifier B - electrically isolated from Channel A; enables simultaneous independent gain configurations. |
| 7 | +In B | Non-inverting input of Amplifier B - identical input specs to Pin 3; supports matched dual-channel front ends. |
| 8 | V+ | Positive supply pin - operates from 2.7V to 5.5V; PSRR >130dB at 1kHz rejects supply noise in mixed-signal PCBs. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full dynamic range utilization in 3V and 5V single-supply systems - no level-shifting required for ADC drivers. |
| G ≥ 5 optimized compensation | Ensures unity-gain instability is avoided while delivering 3MHz bandwidth and 2V/µs slew rate only where needed. |
| 150µA per amplifier quiescent current | Supports always-on dual-channel signal conditioning in battery-powered devices with multi-day runtime. |
| 0.006% THD+N at 1kHz | Meets fidelity requirements for voice-band (300Hz–3kHz) audio preprocessing in electret microphone interfaces. |
| ±0.2mV input offset voltage (typ) | Reduces calibration burden in precision transducer amplifiers - e.g., strain gauge or thermopile front ends. |
Applications
| PCMCIA Data Acquisition | Speech Bandpass Filtering |
|---|---|
Use Scenario: Signal conditioning for 12-bit sampling ADCs (e.g., ADS7822) in compact PCMCIA cards with tight power and board space constraints. IC Role / Device Role / Timing Role: Dual-channel buffer and gain stage - Channel A buffers sensor output, Channel B drives ADC input with rail-to-rail swing. Use Value: 150µA per amplifier enables dual-channel operation under 300µA; rail-to-rail I/O eliminates need for external biasing networks. |
Use Scenario: Electret microphone preamplification and bandpass filtering (300Hz–3kHz) in portable voice recorders or VoIP handsets. IC Role / Device Role / Timing Role: First-stage gain and filter driver - configured as non-inverting amplifier (G = 100) with passive RC network. Use Value: 0.006% THD+N preserves speech intelligibility; 3MHz GBW supports flat response across full passband. |
| Process Control Sensor Interface | Low-Power Active Filters |
Use Scenario: Amplifying low-level outputs from RTDs, thermocouples, or pressure transducers in industrial field instruments powered by 3.3V rails. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front end - dual channels used for differential input buffering and reference generation. Use Value: ±0.2mV offset and ±3µV/°C drift minimize temperature-induced measurement error over –40°C to +85°C. |
Use Scenario: Second-order Sallen-Key or multiple-feedback active filters in handheld test equipment requiring low standby power. IC Role / Device Role / Timing Role: Gain block and integrator core - exploits rail-to-rail output to maximize filter dynamic range at low supply voltages. Use Value: 2V/µs slew rate prevents slew-induced distortion in 10kHz cutoff filters; 250pF capacitive load drive simplifies layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2344UA/2K5 | 1MHz GBW, unity-gain stable, 0.8V/µs slew rate - lower speed but stable at G = 1. | Better suited for unity-gain buffers or low-frequency sensor interfaces where bandwidth <1MHz suffices. | Select OPA2344UA/2K5 when stability at G = 1 is mandatory and 3MHz bandwidth is unnecessary. |
| MCP6022-I/SN | 10MHz GBW, 7V/µs slew rate, 1mA IQ - higher speed and power; not rail-to-rail input (CMVR = V– to V+ – 1.2V). | Applicable in higher-speed control loops but requires level-shifting for ground-referenced inputs. | Choose MCP6022-I/SN only if >3MHz bandwidth is critical and input common-mode range can be constrained. |
Compared with OPA2344UA/2K5, the OPA2345UA/2K5 trades unity-gain stability for 3× higher bandwidth and 2.5× faster slew rate - essential for G ≥ 5 signal chains. Against MCP6022-I/SN, it offers true rail-to-rail input and 5× lower quiescent current, making it superior for battery-powered, ground-sensing applications.
Availability
OPA2345UA/2K5 is available at Aetrix Electronics and suitable for PCMCIA data acquisition, speech bandpass filtering, process control sensor interface, and low-power active filters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for OPA2345UA/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 specializing in analog, embedded processing, and digital signal technologies, with decades of innovation in precision amplifiers and low-power signal chain solutions.
The OPA2345UA/2K5 belongs to TI's MicroAmplifier™ series - designed specifically for miniature, single-supply, rail-to-rail precision applications in portable instrumentation, medical devices, and industrial sensing.
FAQ
What is the minimum operating supply voltage for the OPA2345UA/2K5?
The OPA2345UA/2K5 is fully specified from 2.7V to 5.5V, with guaranteed operation down to 2.5V. At 2.7V, key parameters including gain-bandwidth (3MHz), slew rate (2V/µs), and rail-to-rail output swing remain valid across –40°C to +85°C. Below 2.7V, performance degrades gradually - e.g., GBW reduces to ~2.4MHz at 2.5V - but the OPA2345UA/2K5 remains functional in brown-out conditions typical of battery-powered systems.
Is the OPA2345UA/2K5 unity-gain stable?
No, the OPA2345UA/2K5 is not unity-gain stable. It is internally compensated for minimum closed-loop gain of 5, as confirmed in the datasheet's "Applications Information" section and frequency response curves. Attempting unity-gain operation risks oscillation due to phase margin reduction. For G = 1 applications, use the pin-compatible OPA2344UA/2K5, which shares identical SOIC-8 packaging and DC specs but features unity-gain compensation.
Can the OPA2345UA/2K5 drive capacitive loads directly?
Yes - the OPA2345UA/2K5 can directly drive up to 250pF of pure capacitive load when configured for G ≥ 5, as verified in the "Capacitive Load and Stability" section and typical performance curves. At unity gain, stability requires external compensation (e.g., 10Ω–20Ω series resistor at output). The OPA2345UA/2K5's enhanced phase margin at higher gains makes it suitable for driving ADC input capacitance (e.g., ADS7822) without added components.
What is the input common-mode voltage range of the OPA2345UA/2K5?
The OPA2345UA/2K5 supports an input common-mode voltage range from –0.3V to V+ + 0.3V, extending 300mV beyond both supply rails. This is achieved via a complementary input stage (N- and P-channel pairs). Operation within the transition region (~V+ – 1.8V to V+ – 0.8V) may slightly degrade PSRR, CMRR, and THD - but the OPA2345UA/2K5 maintains full rail-to-rail functionality across its entire specified range.
How does the OPA2345UA/2K5 compare to the OPA2344UA/2K5 in terms of power consumption?
Both the OPA2345UA/2K5 and OPA2344UA/2K5 specify 150µA typical quiescent current per amplifier at 5.5V, with max 250µA over temperature. Measured IQ vs. supply voltage curves confirm identical current draw across 2.5V–5.5V. Thus, the OPA2345UA/2K5 delivers 3× higher bandwidth and 2.5× faster slew rate without increasing power - a key advantage for upgrading existing OPA2344UA/2K5 designs where speed is limiting.
OPA2345UA/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:
- 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-SOIC
OPA2345UA/2K5 FAQ
1.How can I place an order for OPA2345UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2345UA/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 OPA2345UA/2K5 reliable?
The price and inventory of OPA2345UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2345UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2345UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2345UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2345UA/2K5?
OPA2345UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2345UA/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 OPA2345UA/2K5?
For technical support, including OPA2345UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2345UA/2K5 requirements.
6.How does Aetrix verify that OPA2345UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2345UA/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 OPA2345UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2345UA/2K5?
All OPA2345UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2345UA/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 OPA2345UA/2K5 part is unused and in its original packaging.
Return procedure for OPA2345UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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