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Texas Instruments OPA342NA/3KG4
- Part No.:
- OPA342NA/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA342NA/3KG4.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,652
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Product details
Overview
OPA342NA/3KG4 from Texas Instruments is a single-channel, rail-to-rail input/output CMOS operational amplifier optimized for low-power, miniature applications operating from 2.7V to 5.5V supply. It delivers 1MHz gain-bandwidth, 1V/µs slew rate, 150µA typical quiescent current, and output swing within 1mV of rails (RL = 100kΩ), making it ideal for driving sampling ADCs in battery-powered data acquisition systems.
For engineers reviewing the OPA342NA/3KG4 datasheet, OPA342NA/3KG4 pinout, OPA342NA/3KG4 application, or OPA342NA/3KG4 equivalent, key selection criteria include its rail-to-rail dynamic range at low supply voltage, ultra-low power consumption, SOT23-5 footprint compatibility, and verified performance in audio buffering and sensor signal conditioning circuits.
Technical Context
The OPA342NA/3KG4 employs a complementary differential input stage enabling rail-to-rail common-mode input range extending 300mV beyond both supply rails, with a defined transition region between –1.8V and –0.8V relative to V+. Its class AB output stage supports rail-to-rail output swing down to 1mV from rails under light loads while maintaining ≥96dB open-loop gain.
It is unity-gain stable and specified across –40°C to +85°C, with input bias current ≤10pA, input offset voltage ±6mV max, and THD+N of 0.006% at 1kHz - characteristics critical for precision, low-noise signal conditioning in space-constrained, single-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.5V - enables direct integration into 3.3V and 5V systems without level-shifting. |
| Gain-Bandwidth Product | 1MHz - supports stable closed-loop operation up to ~100kHz with moderate gain, suitable for anti-aliasing and sensor amplification. |
| Slew Rate | 1V/µs - ensures faithful reproduction of signals up to ~160kHz full-power bandwidth (for 10Vpp output). |
| Quiescent Current | 150µA typ / 250µA max - allows continuous operation in µA-budget systems like portable instrumentation and IoT edge nodes. |
| Input Offset Voltage | ±6mV max - limits DC error in precision gain stages; typical ±1mV enables <0.1% gain error in 100× amplifiers. |
| THD + Noise | 0.006% at 1kHz - meets high-fidelity audio and measurement-grade signal chain requirements without post-filtering. |
| Output Swing (vs Rail) | 1mV (RL = 100kΩ) - maximizes usable dynamic range in low-voltage ADC driver applications. |
Pinout & Package
SOT23-5 surface-mount package (DBV drawing), 2.9mm × 1.6mm footprint, 1.45mm height, JEDEC MO-178 compliant, MSL Level-2-260°C-1 year.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | +In (Non-inverting Input) | Differential input terminal accepting rail-to-rail common-mode voltage; connects to signal source or feedback network reference point. |
| 2 | –In (Inverting Input) | Differential input terminal; used for feedback path in inverting configurations or as summing node in multi-input designs. |
| 3 | Out (Output) | Class AB rail-to-rail output capable of sourcing/sinking ±15mA; drives ADC inputs, filters, or I/V conversion stages directly. |
| 4 | V– (Negative Supply / Ground) | Reference return for single-supply operation; must be bypassed with 0.01µF ceramic capacitor near pin. |
| 5 | V+ (Positive Supply) | Primary power input; accepts 2.7V–5.5V; requires local 0.01µF ceramic decoupling to suppress supply noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 300mV beyond both supply rails - preserves full input dynamic range even at 2.7V supply, eliminating need for external level-shifting. |
| Rail-to-rail output swing | Within 1mV of rails (100kΩ load) - maximizes signal headroom for 12-bit+ ADCs without sacrificing resolution due to clipping. |
| Ultra-low quiescent current | 150µA typical per amplifier - enables always-on sensing nodes with multi-year battery life in coin-cell powered devices. |
| Unity-gain stability | Stable with CL ≤ 250pF in G = 1 configuration - simplifies layout by allowing direct capacitive loading without external compensation. |
| Low THD+N | 0.006% at 1kHz - ensures minimal harmonic distortion in audio preamplifier and tone generator applications without post-processing. |
Applications
| ADC Driver for Portable Data Acquisition | Electret Microphone Preamplifier |
|---|---|
Use Scenario: Driving ADS7822 12-bit sampling ADC in handheld test equipment with 2.7V–5V supply. IC Role / Device Role / Timing Role: Buffer and gain-stage amplifier isolating ADC input capacitance and charge injection transients. Use Value: Rail-to-rail output swing preserves full 0–VREF ADC input range; 150µA IQ enables >100-hour battery runtime in continuous-sampling mode. |
Use Scenario: Low-noise, single-supply preamplifier for electret microphone in voice-controlled IoT sensors. IC Role / Device Role / Timing Role: High-input-impedance (10¹³ Ω) voltage amplifier with DC-coupled gain of 100× in bandpass-filtered front-end. Use Value: 30nV/√Hz input voltage noise and 0.006% THD+N ensure clean speech capture; SOT23-5 footprint minimizes PCB area in compact modules. |
| Active Filter in Process Control Loop | Current-to-Voltage Converter for Photodiode Sensors |
Use Scenario: 2nd-order Sallen-Key low-pass filter (300Hz–3kHz passband) in industrial temperature monitoring system. IC Role / Device Role / Timing Role: Unity-gain buffer and active filter integrator with rail-to-rail input enabling full-scale sensor signal utilization. Use Value: 1MHz GBW supports sharp roll-off without phase margin loss; rail-to-rail input accepts 0–5V sensor outputs directly without attenuation. |
Use Scenario: Transimpedance amplifier converting photodiode current (nA–µA range) to voltage in optical smoke detector. IC Role / Device Role / Timing Role: Precision I/V converter with ultra-low input bias current (±10pA max) minimizing dark-current error. Use Value: Sub-picoampere IB enables accurate low-light detection; 10¹³ Ω input impedance prevents signal loading on high-impedance photodiodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP6001T-E/OT | Lower GBW (1MHz same), higher IQ (100µA vs 150µA typ), wider VOS range (±3mV vs ±6mV max), same SOT23-5 package. | Better suited for ultra-low-power wake-up circuits where offset drift matters less than raw current draw. | Select MCP6001T-E/OT when sub-100µA average current is mandatory and 12-bit ADC linearity is not required. |
| TLV2461CDBVR | Higher GBW (6.4MHz), higher IQ (550µA), rail-to-rail output only (not input), SO-6/SOT23-6 pinout differs. | Preferred for higher-speed active filtering or fast-settling DAC buffers where speed outweighs power penalty. | Choose TLV2461CDBVR when >200kHz closed-loop bandwidth is needed and PCB layout allows SO-6 or SOT23-6 rework. |
Compared with MCP6001T-E/OT and TLV2461CDBVR, the OPA342NA/3KG4 uniquely balances rail-to-rail input/output, 150µA quiescent current, and 1MHz bandwidth in a standard SOT23-5 footprint - making it optimal for cost-sensitive, battery-powered signal chains requiring full dynamic range at low voltage without layout compromise.
Availability
OPA342NA/3KG4 is available at Aetrix Electronics and suitable for portable data acquisition, electret microphone preamplification, and active filtering applications requiring stable component supply, RoHS-compliant packaging, and long-term industrial lifecycle support.
Supply support for OPA342NA/3KG4 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 over 50 years of innovation in precision amplifiers and signal chain solutions.
The OPA342 series belongs to TI's MicroAmplifier™ portfolio, designed specifically for low-cost, low-power, miniature applications demanding rail-to-rail performance in space-constrained, single-supply systems.
FAQ
What is the maximum operating supply voltage for the OPA342NA/3KG4?
The OPA342NA/3KG4 has an absolute maximum supply voltage of 7.5V between V+ and V– pins. However, its specified operating range is 2.7V to 5.5V - performance parameters including gain-bandwidth, slew rate, and output swing are guaranteed only within this range. Exceeding 5.5V may cause parametric shift or reliability degradation.
Does the OPA342NA/3KG4 support true rail-to-rail input operation?
Yes, the OPA342NA/3KG4 features a complementary input stage enabling rail-to-rail input common-mode voltage range from (V–) –0.3V to (V+) +0.3V. This allows full-scale signal handling at 2.7V supply, though performance parameters like CMRR and PSRR degrade slightly within the 400mV transition region near (V+) –1.3V.
Can the OPA342NA/3KG4 drive capacitive loads without oscillation?
The OPA342NA/3KG4 is unity-gain stable and can directly drive up to 250pF pure capacitive load. For larger loads or improved phase margin, a 10Ω–20Ω series resistor between output and load is recommended - this maintains DC accuracy while suppressing ringing, as confirmed in TI's SBOS106A datasheet Figure 5.
What is the thermal resistance (θJA) of the OPA342NA/3KG4 in its SOT23-5 package?
The OPA342NA/3KG4 in SOT23-5 (DBV) package has a junction-to-ambient thermal resistance (θJA) of 200°C/W under standard JEDEC JESD51-7 conditions. This value assumes a 1-inch² copper pad with two vias; actual board-level θJA depends on PCB layout and copper area.
Is the OPA342NA/3KG4 suitable for audio signal conditioning?
Yes, the OPA342NA/3KG4 is validated for audio applications including electret microphone preamplification and active filtering. Its 0.006% THD+N at 1kHz, 30nV/√Hz input voltage noise, and rail-to-rail output swing enable high-fidelity signal integrity in 3.3V-powered audio paths without external level-shifting.
OPA342NA/3KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 150µA
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.7 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
OPA342NA/3KG4 FAQ
1.How can I place an order for OPA342NA/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA342NA/3KG4 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 OPA342NA/3KG4 reliable?
The price and inventory of OPA342NA/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA342NA/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA342NA/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA342NA/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA342NA/3KG4?
OPA342NA/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA342NA/3KG4 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 OPA342NA/3KG4?
For technical support, including OPA342NA/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA342NA/3KG4 requirements.
6.How does Aetrix verify that OPA342NA/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA342NA/3KG4 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 OPA342NA/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA342NA/3KG4?
All OPA342NA/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA342NA/3KG4, 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 OPA342NA/3KG4 part is unused and in its original packaging.
Return procedure for OPA342NA/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA342NA/3KG4 Tags
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LM358DT
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Texas Instruments
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