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Texas Instruments OPA2345UA
- Part No.:
- OPA2345UA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2345UA.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:123
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Product details
Overview
OPA2345UA from Texas Instruments is a dual, rail-to-rail input/output CMOS operational amplifier optimized for gains ≥5, with 3MHz gain-bandwidth product, 2V/µs slew rate, and 150µA typical quiescent current per amplifier. It operates from 2.7V to 5.5V single supply and drives sampling ADCs in low-power data acquisition systems.
For engineers reviewing the OPA2345UA datasheet, OPA2345UA pinout, OPA2345UA application, or OPA2345UA equivalent, key selection criteria include gain stability at G ≥ 5, rail-to-rail swing within 1mV of rails under light load, THD+N of 0.006% at 1kHz, and MSOP-8 or SOIC-8 package compatibility for space-constrained PCB layouts.
Technical Context
The OPA2345UA uses a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 300mV beyond supplies, with a 400mV transition region where both N- and P-channel pairs operate. Its class AB output stage delivers rail-to-rail output swing-within 1mV of rails at RL = 100kΩ and AOL ≥ 96dB.
Designed for precision low-power applications, it features 30nV/√Hz input voltage noise density at 10kHz, 0.5fA/√Hz current noise density, and 122dB open-loop gain (typ) at 25°C. Channel separation exceeds 130dB at 1kHz, supporting dual-channel signal integrity in compact analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports stable closed-loop operation at G ≥ 5 up to ~600kHz bandwidth |
| Slew Rate | 2V/µs - enables clean 2V output step settling in 1.5µs at G = 5 |
| Quiescent Current | 150µA per amplifier - allows dual op-amp operation below 300µA total, ideal for battery-powered systems |
| Input Offset Voltage | ±0.2mV (typ) - ensures <1LSB error when driving 12-bit ADCs with 5V full-scale range |
| THD + Noise | 0.006% at 1kHz - meets audio-grade signal fidelity requirements in voice-band conditioning |
| Rail-to-Rail Output Swing | Within 1mV of rails (RL = 100kΩ) - maximizes dynamic range in 3V–5.5V single-supply systems |
| Common-Mode Range | –0.3V to (V+) + 0.3V - accepts inputs beyond supply rails, simplifying level-shifting in mixed-signal interfaces |
Pinout & Package
OPA2345UA is available in SOIC-8 (D) and MSOP-8 (DGK) packages, both 8-pin surface-mount formats with identical pinout and thermal resistance (θJA = 150°C/W). The device is not offered in DIP or TSSOP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input B | Accepts differential signal input for second amplifier channel; high-impedance CMOS node (10¹³Ω) |
| 2 | Non-Inverting Input B | Reference input for second channel; supports biasing above or below rail with 300mV overdrive margin |
| 3 | Output B | Class AB rail-to-rail output capable of sourcing/sinking ±15mA; swings to within 1mV of V+ or V– at light load |
| 4 | V– | Negative supply terminal; must be connected to ground or negative rail; ESD clamped ±0.5V beyond rails |
| 5 | V+ | Positive supply terminal; operates from 2.7V to 5.5V; bypass with 0.01µF ceramic capacitor |
| 6 | Non-Inverting Input A | Reference input for first amplifier channel; identical specs and layout sensitivity as Pin 2 |
| 7 | Inverting Input A | Differential input for first channel; laser-trimmed matching to Pin 1 ensures <0.2µV/°C offset drift |
| 8 | Output A | Primary rail-to-rail output; drives capacitive loads ≤250pF directly at G ≥ 5 without external compensation |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full 0–V+ signal swing in single-supply 3V systems, eliminating level-shifting circuitry for ADC interfacing |
| G ≥ 5 optimized architecture | Stable at minimum gain of 5, delivering 3MHz GBW without external compensation-unlike unity-gain-stable OPA2344 |
| Ultra-low quiescent current | 150µA per amplifier allows dual-channel operation in sub-500µA system budgets, critical for portable data loggers |
| High CMRR (92dB typ) | Maintains accuracy in noisy industrial environments where common-mode interference exceeds 100mV |
| Low THD+N (0.006%) | Preserves signal integrity in voice-band (300Hz–3kHz) filtering and electret microphone preamplification |
Applications
| PCMCIA Data Acquisition | Speech Bandpass Filtering |
|---|---|
Use Scenario: Dual-channel signal conditioning for 12-bit sampling ADCs in PCMCIA cards with strict board area and power limits. IC Role / Device Role: OPA2345UA buffers ADS7822 input capacitance and provides programmable gain ≥5 while rejecting charge injection. Use Value: Rail-to-rail swing preserves >99.9% of 5V full-scale range; 150µA per amp keeps total analog front-end current under 500µA. | Use Scenario: Electret microphone interface with 300Hz–3kHz bandpass response in handheld voice recorders. IC Role / Device Role: First-stage gain and filtering using dual amplifiers-one for high-pass, one for low-pass-within same IC. Use Value: Matched dual channels ensure consistent phase response; 0.006% THD+N prevents audible distortion in speech playback. |
| Process Control Sensor Interface | Low-Power Active Filters |
Use Scenario: Conditioning 4–20mA loop sensor outputs in battery-operated remote transmitters. IC Role / Device Role: I/V conversion and gain staging with rail-to-rail output driving SAR ADC reference inputs. Use Value: Input common-mode range extends 300mV below ground, accommodating negative sensor offsets without level shifters. | Use Scenario: Second-order Sallen-Key filter in portable medical sensors requiring precise cutoff and minimal power. IC Role / Device Role: Dual amplifier implements unity-gain buffer + G = 5 filter stage in single SOIC-8 footprint. Use Value: 3MHz GBW ensures flat passband to 100kHz; 2V/µs slew rate prevents slew-induced distortion on filtered pulses. |
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 | Unity-gain stable, 1MHz GBW, 0.8V/µs slew rate, same SOIC-8 package and pinout | Preferred for G = 1 buffering or low-frequency (<100kHz) applications where stability at unity gain is required | Select OPA2344UA when gain is unity or variable down to 1; OPA2345UA is mandatory for stable G ≥ 5 operation |
| MCP6022-E/SN | 2MHz GBW, 1.2V/µs slew rate, 100µA IQ, rail-to-rail I/O, but only 2.7V–6.0V supply range and no 0.006% THD+N spec | Suitable for general-purpose dual op-amp use but lacks verified audio-grade THD+N performance | Choose MCP6022-E/SN for cost-sensitive industrial sensing where ultra-low distortion is not required |
Compared with OPA2344UA and MCP6022-E/SN, the OPA2345UA uniquely delivers 3MHz bandwidth with guaranteed stability at G ≥ 5 and 0.006% THD+N-making it the only option for high-fidelity, medium-speed signal chains in space-constrained, single-supply designs.
Availability
OPA2345UA is available at Aetrix Electronics and suitable for PCMCIA data acquisition, speech bandpass filtering, and process control sensor interface applications requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for OPA2345UA 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 op-amps and low-power signal chain solutions.
The OPA2345UA belongs to TI's MicroAmplifier™ series, designed specifically for miniature, battery-powered precision analog applications where rail-to-rail operation, low IQ, and G ≥ 5 stability are essential.
FAQ
What is the minimum stable gain for OPA2345UA?
The OPA2345UA is optimized for stable operation at closed-loop gains of 5 or greater. Unlike the unity-gain-stable OPA2344UA, it is not guaranteed stable at G = 1. Attempting unity-gain configuration may cause peaking or oscillation due to its internal compensation tailored for higher gain bandwidth. Always verify stability with simulation or bench testing when operating near the minimum gain boundary.
Does OPA2345UA support true rail-to-rail input and output?
Yes, OPA2345UA supports rail-to-rail input with a common-mode range from –0.3V to (V+) + 0.3V, and rail-to-rail output that swings to within 1mV of either supply rail under light load (RL = 100kΩ). This capability is enabled by complementary CMOS input stages and a class AB output stage, making it ideal for single-supply 3V systems where maximum dynamic range is critical.
What package options are available for OPA2345UA?
OPA2345UA is offered in two RoHS-compliant, lead-free surface-mount packages: SOIC-8 (package drawing D, marking "OPA2345UA") and MSOP-8 (package drawing DGK, marking "B45"). Both have identical pinouts, thermal resistance (θJA = 150°C/W), and MSL Level-2-260C-1 YEAR rating. No DIP, TSSOP, or SOT-23 variants exist for the dual OPA2345 version.
Can OPA2345UA drive capacitive loads directly?
Yes, OPA2345UA can directly drive up to 250pF of pure capacitive load when configured with gain ≥5. At G = 5, its phase margin remains sufficient for stability without external compensation. For unity-gain configurations-which are not recommended for this part-capacitive loading requires series output resistance (10Ω–20Ω) to prevent ringing. Always consult the "Small-Signal Overshoot vs Load Capacitance" curve in the datasheet for design validation.
What is the specified operating temperature range for OPA2345UA?
The OPA2345UA is fully specified and production-tested over the industrial temperature range of –40°C to +85°C. While its absolute maximum ratings allow operation from –55°C to +125°C, electrical parameters such as offset voltage drift (±3µV/°C), CMRR (74dB min), and quiescent current (300µA max) are only guaranteed across the –40°C to +85°C range. Designs targeting extended temperature use must perform full characterization.
OPA2345UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for OPA2345UA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2345UA 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 reliable?
The price and inventory of OPA2345UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2345UA is usually 5 days.
3.What payment methods are accepted for OPA2345UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2345UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2345UA?
OPA2345UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2345UA 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?
For technical support, including OPA2345UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2345UA requirements.
6.How does Aetrix verify that OPA2345UA is sourced from the original manufacturer or authorized distributors?
All OPA2345UA 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 meets industry standards.
7.What is the process for return or replacement of OPA2345UA?
All OPA2345UA units undergo pre-shipment inspection (PSI). If there is an issue with OPA2345UA, 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 part is unused and in its original packaging.
Return procedure for OPA2345UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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