OPA340UA - 5.5 MHz Low-Power Rail-to-Rail Op Amp | Texas Instruments
N.º da peça: OPA340UA ✓ AtivoOPA340UA Visão geral
An operational amplifier is an analog signal-conditioning IC used to amplify voltage differences, buffer high-impedance sources, drive analog-to-digital converters, and implement active filters. The OPA340 belongs to the broader voltage-feedback operational-amplifier family within the analog amplifier and signal-conditioning hierarchy. Its rail-to-rail input and output behavior is useful when the usable signal range extends close to the supply rails, while its CMOS architecture supports low-power portable and precision analog systems.
Key features include 5.5 MHz unity-gain bandwidth, 6 V/us slew rate, 0.0007% total harmonic distortion plus noise at 1 kHz, and 750 uA quiescent current per channel. The low-noise, low-distortion combination is suitable for audio paths and general-purpose signal conditioning. The single amplifier configuration allows a compact solution where only one independent gain stage is required, and the 8-SOIC format supports conventional surface-mount assembly.
OPA340 devices are optimized for driving sampling analog-to-digital converters because the wide bandwidth and rail-to-rail output provide useful signal-range flexibility. The series is also suitable for audio applications, data acquisition, current-to-voltage conversion, buffering, and general-purpose low-voltage analog systems. Rail-to-rail operation is especially helpful when the signal must remain usable near either supply rail, although exact input and output swing limits should be checked in the manufacturer datasheet for the selected supply voltage.
For portable or low-power designs, the 750 uA per channel quiescent current helps limit standing power consumption when the amplifier is active. The principal design trade-offs are bandwidth and slew rate versus supply voltage, output-drive capability, noise, and the need to keep input and output within the linear operating region. Decoupling capacitors and careful signal routing remain essential for stable operation.
This page combines manufacturer product information, parametric comparisons, practical application guidance, and package-level design notes for engineers evaluating the OPA340UA in analog signal chains. It also identifies drop-in alternatives and their measurable differences so selection can be made against the required bandwidth, supply voltage, noise, and package constraints.
Alternativas drop-in para OPA340UA — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com OPA340UA (mesmo formato e footprint) — diferindo em Amplifier Type, Operating Temperature Range, Package, Slew Rate.
OPA349UAG4
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OPA343NA/250G4
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OPA376AID
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
OPA340UA Classificações máximas e características elétricas
| Amplifier Type | Single operational amplifier |
| Topologia | Rail-to-rail CMOS operational amplifier |
| Number of Channels | 1 |
| Supply Configuration | Single supply |
| Input Common Mode | Rail-to-rail |
| Output Swing | Rail-to-rail within 1 mV |
| Unity-Gain Bandwidth | 5.5 MHz |
| Slew Rate | 6 V/us |
| Total Harmonic Distortion Plus Noise | 0.0007% at 1 kHz |
| Corrente de repouso | 750 uA/channel |
| Encapsulamento | 8-SOIC |
| Tipo de montagem | Surface mount |
| Application Category | General-purpose instrumentation amplifier |
| Input Signal Type | Single-ended |
| Rail-to-Rail Output | Within 1 mV |
| MicroSize Packaging | Available |
Guia de Configuração de Pinos do OPA340UA 8-soic
Configuração de pinos para OPA340UA (pacote 8-soic). Este componente analógico possui pinos de entrada, saída e alimentação. Consulte o datasheet do fabricante para configurações de offset null, compensação e pino de enable. Ideal para circuitos de condicionamento de sinal e amplificadores.
Nenhum dado detalhado de pinagem disponível para OPA340UA.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
OPA340UA é adequado para 6 aplicaçãos: ADC Signal Conditioning, Portable Audio Amplification, Current-to-Voltage Conversion, Industrial Data Acquisition, Low-Voltage Sensor Buffering, Active Filtering and Signal Conditioning.
ADC Signal Conditioning
The OPA340UA suits low-voltage ADC input conditioning because its 5.5 MHz bandwidth and 6 V/us slew rate provide ample response for many sampling systems, while rail-to-rail input and output behavior helps use the available supply range. It can amplify a sensor or conditioning-network output and drive the converter through an appropriate feedback network. Place the amplifier close to the ADC to reduce capacitive loading and susceptibility to noise. The key trade-off is that bandwidth alone does not guarantee adequate settling at the ADC's highest sample rate, so verify acquisition time, output drive, load, and noise requirements against the actual converter and signal source.
Recomendado
Portable Audio Amplification
The OPA340UA is appropriate for compact audio stages because Texas Instruments identifies the OPA340 family for audio applications and specifies 0.0007% THD plus noise at 1 kHz. With 5.5 MHz bandwidth and 6 V/us slew rate, it can process low-frequency audio with adequate margin for higher-order filtering and gain-setting networks. Its 750 uA per channel quiescent current supports battery-conscious designs. Actual audio performance still depends on supply voltage, load impedance, gain, output level, and output-headroom limits, particularly when driving headphones, speakers, or line-level inputs through additional output stages.
Recomendado
Current-to-Voltage Conversion
The OPA340UA can serve as the transimpedance element in current-to-voltage conversion because the TI OPA340 family is specifically described as suitable for I/V conversion at DAC outputs and as a general-purpose low-voltage amplifier. A feedback resistor establishes the conversion gain while the 5.5 MHz bandwidth supports higher-value transimpedance gains than a much slower amplifier. Layout is critical: keep the feedback resistor and input node compact, minimize parasitic capacitance, and provide input-bias-current compensation when source resistance is high. Check total input capacitance and the resulting stability and bandwidth trade-off against the sensor or photodiode characteristics.
Recomendado
Industrial Data Acquisition
The OPA340UA supports low-voltage industrial data-acquisition channels by combining rail-to-rail operation, 750 uA per channel quiescent current, and a compact 8-SOIC package. It can amplify a conditioned transducer signal before conversion by an ADC, buffer a sensor output, or implement an active filter close to the measurement node. The single-supply architecture simplifies systems that operate from a low-voltage rail. Because industrial environments can introduce slow drift and interference, use stable reference elements, adequate bypass capacitors, and protected routing, and verify offset, bias-current, and common-mode behavior against the required measurement accuracy.
Recomendado
Low-Voltage Sensor Buffering
The OPA340UA is suitable for buffering sensor outputs when the signal spans much of a low-voltage supply and the acquisition circuit needs low power. Rail-to-rail input behavior preserves signal range near the supply limits, while rail-to-rail output within 1 mV and 5.5 MHz bandwidth allow the buffered signal to drive downstream analog stages. The 750 uA per channel quiescent current helps preserve battery life in distributed sensing systems. The buffer cannot improve a noisy or nonlinear sensor, however, and input bias current, offset voltage, capacitive loading, and stable reference design can set the real system accuracy.
Recomendado
Active Filtering and Signal Conditioning
The OPA340UA is useful in low-voltage active-filter and general signal-conditioning implementations because its 5.5 MHz bandwidth provides frequency-response margin around lower-band audio, sensor, and control signals. Rail-to-rail input and output operation supports filter stages operating near the supply rails, and the 6 V/us slew rate helps preserve large-signal response through higher-gain sections. Component tolerances, op-amp noise, and stability determine achievable filter accuracy. Use the manufacturer SPICE model and evaluation of the complete feedback network to verify gain, phase margin, and expected response before production release.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para OPA340UA — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | OPA349UAG4 | OPA343NA/250G4 | OPA376AID |
|---|---|---|---|---|
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Amplifier Configuration | Single amplifier | Single amplifier | Single amplifier | Single amplifier |
| Supply Configuration | Single supply | Single supply | Single supply | Single supply |
| Input Common Mode | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail |
Principais diferenciais
- Lower specified quiescent current than the OPA376AID candidate (vs OPA376AID)
- Equal listed unity-gain bandwidth in the principal cross-brand comparison (vs OPA376AID)
- Documented low-distortion performance at 1 kHz (vs OPA376AID)
Notas de projeto
Place the OPA340UA close to the signal source or ADC input, and keep the high-impedance input node as short as possible. Connect supply decoupling directly to the device pins with a short ground return. For transimpedance use, minimize the feedback-resistor footprint and avoid routing between the input pin and inverting input on different layers.
The OPA340UA is specified at 750 uA quiescent current per channel, so calculate the standing amplifier current separately from load current and switching losses. Keep the supply within the manufacturer operating range and account for the output current needed by the next stage. Rail-to-rail behavior does not eliminate the need to verify input and output headroom at the selected supply voltage.
Use short, guarded routes for high-impedance signals and avoid capacitive loading of the input node. If driving an ADC or long trace, use a series isolation resistor or RC network selected from the amplifier and converter data to control capacitive loading. Check settling time against the acquisition interval and use the manufacturer SPICE model for stability analysis.
Do not interpret the rail-to-rail output specification as unlimited output swing. The manufacturer states output operation within 1 mV of the rails under specified conditions, so verify load, output current, frequency, and supply voltage before relying on the full signal range. Also avoid selecting a replacement from package similarity alone; verify every pin function and the complete electrical limits.
Informações de conformidade
The manufacturer and distributor content confirms the device and its electrical characteristics but does not explicitly state the requested compliance fields. Use the current Texas Instruments product page and applicable quality documentation for compliance decisions.
