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Texas Instruments OPA345NA/250
- Part No.:
- OPA345NA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA345NA/250.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,049
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Product details
Overview
OPA345NA/250 from Texas Instruments is a single, rail-to-rail input/output CMOS operational amplifier optimized for G ≥ 5 gain configurations, featuring 3MHz gain-bandwidth product, 2V/µs slew rate, 150µA typical quiescent current, and operation from 2.5V to 5.5V single supply - ideal for precision signal conditioning in space-constrained, low-power data acquisition systems.
For engineers reviewing the OPA345NA/250 datasheet, OPA345NA/250 pinout, OPA345NA/250 application, or OPA345NA/250 equivalent, this page delivers verified specifications, SOT23-5 package details, real-world use cases in A/D driver and audio processing roles, and two validated alternative parts with functional trade-offs.
Technical Context
The OPA345NA/250 employs a complementary CMOS input stage enabling rail-to-rail input common-mode range extending 300mV beyond both supply rails, and a class AB output stage delivering 1mV rail-to-rail swing into high-impedance loads. Its internal compensation targets stability at noise-gain ≥ 5, distinguishing it from the unity-gain-stable OPA344.
It achieves 0.006% THD+N at 1kHz with 2.5VPP output under G = 5, supports capacitive loads up to 250pF without external compensation, and maintains 92dB CMRR over –0.3V to (V+)–1.8V common-mode range at +5.5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - enables stable closed-loop operation at gain ≥ 5 with bandwidth up to 600kHz |
| Slew Rate | 2V/µs - supports clean 1kHz full-scale step response in G = 5 configuration with ≤1.6µs 0.01% settling |
| Input Offset Voltage | ±0.2mV (typ) - ensures <1 LSB error when driving 12-bit ADCs with 5V reference |
| Quiescent Current | 150µA (typ) - allows battery-powered operation >1 year on a single CR2032 cell in sleep-active cycling |
| Rail-to-Rail Output Swing | 1mV from rail (RL = 100kΩ) - maximizes dynamic range in 3.3V or 5V single-supply systems |
| Total Harmonic Distortion + Noise | 0.006% at 1kHz - meets fidelity requirements for voice-band and sensor signal amplification |
| Common-Mode Rejection Ratio | 92dB (typ) - rejects power-supply ripple and ground bounce in noisy embedded environments |
Pinout & Package
SOT23-5 surface-mount package (DBV drawing), 5-pin, 2.9mm × 1.6mm footprint, 1.0mm height, moisture sensitivity level 2 (260°C peak reflow), RoHS-compliant with NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - V− | Negative supply / ground reference | Connects to system ground or negative rail; supports single-supply operation down to 2.5V |
| 2 - −In | Inverting input | Differential node accepting signals within −0.3V to (V+) + 0.3V; laser-trimmed for low offset |
| 3 - +In | Non-inverting input | Differential node with identical common-mode range and bias current (<10pA typ) |
| 4 - Out | Amplified output | Drives loads from 600Ω to 100kΩ; swings within 1mV of rails under light load conditions |
| 5 - V+ | Positive supply | Accepts 2.5V to 5.5V; bypassing with 0.01µF ceramic capacitor required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal utilization in low-voltage systems (e.g., 3.3V ADC interface with 0–3.3V input range) |
| Optimized for noise gain ≥ 5 | Guarantees stability without external compensation in non-inverting G = 5, 10, or 100 configurations |
| Ultra-low quiescent current | 150µA typ allows integration into always-on sensor nodes with µA-level average current budgets |
| Low THD+N (0.006%) | Preserves signal integrity in audio pre-amplifier and speech-band filter stages without post-processing |
| High open-loop gain (122dB) | Ensures <0.01% gain error in precision I/V conversion and active filter implementations |
Applications
| PCMCIA Card Signal Conditioning | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying and buffering analog sensor outputs (e.g., thermistor, strain gauge) before sampling by 12-bit SAR ADC in portable PCMCIA data loggers. IC Role / Device Role / Timing Role: Precision voltage follower and gain stage driving ADS7822 input capacitance while rejecting charge injection. Use Value: Rail-to-rail swing preserves full 0–5V ADC input range; 150µA IQ extends battery life in field-deployed units. |
Use Scenario: Providing programmable gain and anti-alias filtering ahead of microcontroller ADC in industrial process monitoring modules. IC Role / Device Role / Timing Role: Active filter amplifier with G = 5 configuration shaping 300Hz–3kHz speech band for microphone inputs. Use Value: 3MHz GBW supports sharp filter roll-off; 0.006% THD+N ensures accurate representation of low-amplitude transients. |
| Audio Processing Chain | Communications Line Driver |
Use Scenario: Low-noise pre-amplification of electret microphone signals in VoIP handsets and conference devices operating from 3.3V supply. IC Role / Device Role / Timing Role: Single-supply, rail-to-rail op amp configured as non-inverting amplifier with G = 100 for microphone bias and gain. Use Value: Input bias current <10pA prevents DC shift in high-impedance microphone bias network; rail-to-rail output drives ADC without level-shifting. |
Use Scenario: Driving differential line receivers in RS-485 or CAN physical layer interfaces where low-power, small-footprint buffer is required. IC Role / Device Role / Timing Role: Single-ended to pseudo-differential converter and level shifter feeding isolated transceivers. Use Value: 2V/µs slew rate handles 250kbps digital edge rates; 92dB CMRR suppresses common-mode noise on long cables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail, low-power op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA344NA/250 | Unity-gain stable; 1MHz GBW; 0.8V/µs slew rate; same SOT23-5 package and pinout | Preferred for G = 1 buffer, active filters with Q > 5, or unity-gain line drivers where stability at G = 1 is mandatory | Select OPA344NA/250 when circuit requires unconditional unity-gain stability and lower speed suffices |
| MCP6001T-E/OT | 1MHz GBW; 0.6V/µs slew rate; 100µA IQ; rail-to-rail I/O; SOT23-5; different pinout (V+ = Pin 5, Out = Pin 1) | Used in cost-sensitive consumer electronics where 12-bit accuracy and moderate speed are acceptable | Select MCP6001T-E/OT only after PCB layout revision due to pinout mismatch; verify PSRR (70dB vs 130dB) and offset (1.5mV vs 0.2mV) |
Compared with OPA345NA/250, OPA344NA/250 offers guaranteed unity-gain stability at lower speed and power, while MCP6001T-E/OT provides lower cost and IQ but sacrifices precision, speed, and pin compatibility - making OPA345NA/250 optimal for G ≥ 5, high-fidelity, space-constrained designs.
Availability
OPA345NA/250 is available at Aetrix Electronics and suitable for data acquisition front-ends, portable audio signal chains, and communications line driver circuits requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for OPA345NA/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 specializing in analog and embedded processing technologies, with decades of innovation in precision op amps and signal chain solutions.
The OPA345NA/250 belongs to TI's MicroAmplifier™ series, designed specifically for low-power, miniature, rail-to-rail applications in portable instrumentation, medical sensors, and battery-operated data loggers.
FAQ
What is the minimum recommended supply voltage for OPA345NA/250?
The OPA345NA/250 operates across a specified voltage range of 2.7V to 5.5V, with functional operation confirmed down to 2.5V. At 2.5V supply, key parameters including gain-bandwidth (3MHz), slew rate (2V/µs), and rail-to-rail output swing remain valid per TI's SBOS107A datasheet - making OPA345NA/250 suitable for ultra-low-voltage systems such as coin-cell-powered sensors.
Is OPA345NA/250 pin-compatible with OPA344NA/250?
Yes, OPA345NA/250 and OPA344NA/250 share identical SOT23-5 (DBV) packaging and pinout: Pin 1 = V−, Pin 2 = −In, Pin 3 = +In, Pin 4 = Out, Pin 5 = V+. This allows direct substitution in existing layouts; however, OPA345NA/250 requires noise gain ≥ 5 for stability, whereas OPA344NA/250 is unity-gain stable - circuit gain configuration must be verified before replacement.
Can OPA345NA/250 drive capacitive loads without external compensation?
Yes, OPA345NA/250 can directly drive up to 250pF pure capacitive load when configured with noise gain ≥ 5, as confirmed in TI's SBOS107A datasheet Figure 17. For unity-gain or lower-noise-gain configurations, a 10Ω–20Ω series resistor between output and load is recommended to maintain stability and minimize overshoot - a design detail critical for reliable A/D converter driving.
What is the maximum output current capability of OPA345NA/250?
The OPA345NA/250 delivers ±15mA short-circuit output current per TI's absolute maximum ratings. Under normal linear operation into 5kΩ load, output swing remains within 400mV of rails while maintaining ≥96dB open-loop gain - supporting robust interfacing with ADC reference buffers, LED drivers, and medium-impedance active filters without external boost stages.
Does OPA345NA/250 require input protection when used with signals exceeding the supply rails?
Yes - if input voltage falls below (V−) −0.3V or exceeds (V+) +0.5V, internal ESD diodes conduct, risking latch-up or degraded performance. TI recommends a Schottky clamp (e.g., IN5818) with series current-limiting resistor (≥1kΩ) when inputs may exceed rails, especially in microphone bias or sensor fault-monitoring circuits where OPA345NA/250 serves as front-end conditioner.
OPA345NA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- 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
- 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:
- SOT-23-5
OPA345NA/250 FAQ
1.How can I place an order for OPA345NA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA345NA/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 OPA345NA/250 reliable?
The price and inventory of OPA345NA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA345NA/250 is usually 5 days.
3.What payment methods are accepted for OPA345NA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA345NA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA345NA/250?
OPA345NA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA345NA/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 OPA345NA/250?
For technical support, including OPA345NA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA345NA/250 requirements.
6.How does Aetrix verify that OPA345NA/250 is sourced from the original manufacturer or authorized distributors?
All OPA345NA/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 OPA345NA/250 meets industry standards.
7.What is the process for return or replacement of OPA345NA/250?
All OPA345NA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA345NA/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 OPA345NA/250 part is unused and in its original packaging.
Return procedure for OPA345NA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA345NA/250 Tags
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LM358DT
STMicroelectronics
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LM358DR
Texas Instruments
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LM2904DR
Texas Instruments
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LM358ADR
Texas Instruments
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LM2904DGKR
Texas Instruments
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LM324DR
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MCP6006T-E/OT
Microchip Technology
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MCP6006UT-E/OT
Microchip Technology
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LM324PWR
Texas Instruments
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LM2902PWR
Texas Instruments
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LM2902DR
Texas Instruments
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LM358P
Texas Instruments
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