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Texas Instruments OPA2345EA/2K5
- Part No.:
- OPA2345EA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2345EA/2K5.pdf
- Description:
- IC CMOS 2 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,552
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Product details
Overview
OPA2345EA/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, 150µA typical quiescent current per amplifier, and output swing within 1mV of rails under light load-enabling precision signal conditioning in space-constrained, low-power data acquisition systems.
For engineers reviewing the OPA2345EA/2K5 datasheet, OPA2345EA/2K5 pinout, OPA2345EA/2K5 application, or OPA2345EA/2K5 equivalent, key selection criteria include its gain-stability requirement (G ≥ 5), rail-to-rail I/O performance at low supply voltage, THD+N of 0.006% at 1kHz, microsize MSOP-8 package, and specified –40°C to +85°C operating range.
Technical Context
The OPA2345EA/2K5 implements a complementary CMOS input stage enabling rail-to-rail common-mode input range extending 300mV beyond both supply rails. Its architecture includes separate N-channel and P-channel differential pairs with a 400mV transition region where both are active-requiring careful biasing to avoid degradation in PSRR, CMRR, and THD.
It uses a class AB output stage with common-source transistors to achieve rail-to-rail output swing. The device is internally compensated for stable operation only at closed-loop gains ≥5, distinguishing it from the unity-gain-stable OPA2344 family members.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports stable amplification up to ~600kHz at G = 5, critical for anti-aliasing and sensor signal conditioning. |
| Slew Rate | 2V/µs - enables faithful reproduction of 318kHz full-scale 10Vpp signals without slewing distortion. |
| Input Offset Voltage | ±0.2mV (typ) - ensures ≤0.02% gain error in 1V full-scale 12-bit ADC driver applications. |
| Quiescent Current | 150µA per amplifier (typ) - allows dual-channel operation below 300µA total, suitable for battery-powered instrumentation. |
| Output Swing | Within 1mV of rails (RL = 100kΩ) - maximizes dynamic range in 3.3V or 5V single-supply systems driving SAR ADC inputs. |
| THD + Noise | 0.006% at 1kHz, G = 5 - meets audio-grade and high-fidelity sensor interface requirements. |
| Common-Mode Range | –0.3V to (V+) + 0.3V - permits direct interfacing with sensors whose outputs swing below ground or above V+. |
| Supply Voltage Range | 2.7V to 5.5V - compatible with Li-ion, USB, and industrial 3.3V/5V rails without level-shifting. |
Pinout & Package
OPA2345EA/2K5 is supplied in an 8-pin MSOP (VSSOP) package (DGK drawing), measuring 3.0mm × 3.0mm × 1.0mm with 0.65mm pitch. This thermally enhanced surface-mount package provides θJA = 150°C/W and is RoHS-compliant with NiPdAu lead finish (Level-2 MSL).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input B (–In B) | High-impedance node for feedback network connection in Channel B; accepts rail-to-rail common-mode voltages. |
| 2 | Non-Inverting Input A (+In A) | High-impedance node for signal source connection in Channel A; enables true DC-coupled sensor interfaces. |
| 3 | Output A (Out A) | Class AB rail-to-rail output capable of sourcing/sinking ±15mA; swings within 1mV of V+ or V– under light load. |
| 4 | V– (Ground/–VS) | Power return path; must be low-impedance; bypassed with 0.01µF ceramic capacitor near pin. |
| 5 | V+ (+VS) | Positive supply input (2.7V–5.5V); requires local 0.01µF ceramic decoupling to minimize PSRR degradation. |
| 6 | Non-Inverting Input B (+In B) | Independent high-Z input for Channel B; identical specs to Pin 2, supporting dual-sensor or differential pair use. |
| 7 | Inverting Input A (–In A) | Feedback node for Channel A; matches Pin 1 electrical characteristics for matched dual-channel performance. |
| 8 | Output B (Out B) | Second rail-to-rail output; electrically isolated from Out A; supports independent gain/feedback configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 2.7V–5.5V supply range-critical for maximizing SNR in low-voltage ADC drivers and I/V converters. |
| G ≥ 5 stability optimization | Eliminates need for external compensation in gain-of-5+ circuits, reducing component count and board area in active filters and instrumentation amps. |
| 150µA per amplifier quiescent current | Supports always-on dual-channel monitoring (e.g., temperature + humidity) with sub-300µA total system bias current. |
| 3MHz GBW with 2V/µs slew rate | Meets settling-time requirements (<1.6µs to 0.01%) for 12-bit sampling at 500ksps in data acquisition front-ends. |
| 0.006% THD+N at 1kHz | Preserves signal fidelity in audio processing and precision analog sensor chains where harmonic distortion impacts measurement accuracy. |
| MSOP-8 (DGK) package | 3.0 × 3.0 mm footprint saves >50% board area vs SOIC-8-ideal for PCMCIA cards, portable medical devices, and IoT edge nodes. |
Applications
| PCMCIA Data Acquisition Card | Industrial Process Control Loop |
|---|---|
Use Scenario: Dual-channel analog front-end on compact PCMCIA card digitizing thermocouple and RTD signals at 10ksps using ADS7822 12-bit ADC. IC Role / Device Role / Timing Role: OPA2345EA/2K5 buffers sensor outputs, provides programmable gain ≥5, drives ADC input capacitance, and rejects supply noise during sampling. Use Value: Rail-to-rail I/O preserves full 0–3.3V ADC input range; 150µA/channel enables card operation from 5V bus power with <1mW analog section dissipation. | Use Scenario: Dual-channel 4–20mA transmitter interface conditioning pressure and flow sensor outputs in hazardous-area loop-powered transmitters. IC Role / Device Role / Timing Role: OPA2345EA/2K5 performs I/V conversion and signal amplification with G ≥ 5 before 16-bit ΣΔ ADC sampling. Use Value: 3MHz GBW ensures <1µs step response for fast loop control; rail-to-rail output drives DAC reference buffers without headroom loss. |
| Audio Bandpass Filter for Speech | Low-Power Test Equipment Signal Generator |
Use Scenario: Dual-op-amp bandpass filter (300Hz–3kHz) in electret microphone preamp for voice-controlled IoT devices operating from 2.7V. IC Role / Device Role / Timing Role: OPA2345EA/2K5 implements first- and second-stage filtering with G = 100 total gain while maintaining THD+N < 0.01%. Use Value: 0.006% THD+N preserves speech intelligibility; 300µA max total quiescent current extends battery life beyond 1 year in coin-cell-powered designs. | Use Scenario: Portable handheld calibrator generating precision 100mV–5V test signals for field verification of industrial sensors and controllers. IC Role / Device Role / Timing Role: OPA2345EA/2K5 serves as output buffer and gain stage for DAC-based waveform synthesis, driving 600Ω loads. Use Value: Output swing within 1mV of rails ensures full-scale accuracy across 3.3V/5V supplies; MSOP-8 package enables compact, ruggedized enclosure design. |
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 |
|---|---|---|---|
| OPA2344EA/2K5 | Unity-gain stable; 1MHz GBW; 0.8V/µs slew rate; same MSOP-8 package and pinout. | Preferred for G = 1–4 circuits (e.g., voltage followers, simple buffers) where bandwidth <1MHz suffices. | Select when gain <5 is required or lower power (150µA typ) is prioritized over speed. |
| MCP6022-E/SN | 2.5MHz GBW; 1.2V/µs slew rate; 100µA IQ; rail-to-rail I/O; SOIC-8 only (no MSOP option). | Lacks MSOP-8 footprint; lower slew rate limits high-frequency fidelity; higher input bias current (1pA vs 0.2pA). | Choose for cost-sensitive SOIC-based designs where 2.5MHz bandwidth meets requirements and MSOP size is not mandatory. |
Compared with OPA2344EA/2K5 and MCP6022-E/SN, the OPA2345EA/2K5 uniquely balances 3MHz bandwidth, 2V/µs slew rate, and ultra-low 150µA quiescent current in a space-saving MSOP-8 package-making it optimal for dual-channel, gain ≥5, battery-constrained signal chains requiring high dynamic range.
Availability
OPA2345EA/2K5 is available at Aetrix Electronics and suitable for PCMCIA data acquisition cards, industrial process control transmitters, and portable audio signal conditioning systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant micro-packages.
Supply support for OPA2345EA/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, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The OPA2345EA/2K5 belongs to TI's MicroAmplifier™ series-designed specifically for precision, low-power, miniature applications such as portable instrumentation, sensor interfaces, and battery-operated data acquisition systems.
FAQ
What is the minimum recommended gain for stable operation of the OPA2345EA/2K5?
The OPA2345EA/2K5 is internally compensated for stable operation only at closed-loop gains of 5 or greater. Using it at G < 5 may cause peaking, ringing, or oscillation due to phase margin reduction. For unity-gain or low-gain applications, the pin-compatible OPA2344EA/2K5 should be selected instead.
Does the OPA2345EA/2K5 support true rail-to-rail input common-mode voltage range?
Yes-the OPA2345EA/2K5 features a complementary CMOS input stage allowing common-mode voltage operation from –0.3V to (V+) + 0.3V. This extends 300mV beyond both supply rails, enabling direct interfacing with sensors whose outputs swing below ground or above V+ in single-supply systems.
What is the maximum capacitive load the OPA2345EA/2K5 can drive without external compensation?
When configured with gain ≥5, the OPA2345EA/2K5 can directly drive up to 250pF of pure capacitive load while maintaining stability. At unity gain, this capability drops significantly; however, the OPA2345EA/2K5 is not unity-gain stable and must not be used in G = 1 configurations.
How does the OPA2345EA/2K5 handle input voltages that exceed the supply rails?
The OPA2345EA/2K5 input terminals are diode-clamped to the supply rails. Input signals exceeding (V+) + 0.5V or falling below (V–) – 0.5V must be current-limited to ≤10mA using a series resistor to prevent damage to internal ESD protection diodes and avoid output lockup.
Is the OPA2345EA/2K5 suitable for driving the input of a 12-bit SAR ADC like the ADS7822?
Yes-the OPA2345EA/2K5 is explicitly optimized for driving medium-speed sampling ADCs such as the ADS7822. Its rail-to-rail output swing, low THD+N (0.006%), fast settling time (1.6µs to 0.01%), and ability to buffer charge injection make it ideal for precision 12-bit data acquisition front-ends.
OPA2345EA/2K5 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:
- Obsolete
- 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/2K5 FAQ
1.How can I place an order for OPA2345EA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2345EA/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 OPA2345EA/2K5 reliable?
The price and inventory of OPA2345EA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2345EA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA2345EA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2345EA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2345EA/2K5?
OPA2345EA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2345EA/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 OPA2345EA/2K5?
For technical support, including OPA2345EA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2345EA/2K5 requirements.
6.How does Aetrix verify that OPA2345EA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA2345EA/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 OPA2345EA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA2345EA/2K5?
All OPA2345EA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2345EA/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 OPA2345EA/2K5 part is unused and in its original packaging.
Return procedure for OPA2345EA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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