OPA340PA - 5.5 MHz Rail-to-Rail Low-Power Op Amp | TI
Référence : OPA340PA ✓ ActifOPA340PA Présentation
An operational amplifier is a voltage-gain circuit used to amplify weak signals while buffering sources from subsequent stages. The OPA340 belongs to the CMOS operational-amplifier hierarchy, combining low power consumption with wide bandwidth and rail-to-rail signal handling. These characteristics place it between general-purpose voltage amplifiers and higher-speed precision amplifiers used in portable and low-voltage systems.
The OPA340's 5.5 MHz bandwidth supports higher-frequency signal paths than a conventional low-speed precision op amp. Its 6 V/us slew rate enables rapid output transitions, while the specified total harmonic distortion plus noise of 0.0007% at 1 kHz is useful in low-distortion audio and measurement circuits. Rail-to-rail input operation increases usable common-mode range, and output swing within 1 mV of the supply rails improves dynamic range on low-voltage rails.
The low 750 uA quiescent current makes the amplifier suitable for battery-powered equipment where continuous amplifier power can determine operating time. The single-supply architecture simplifies signal-chain design because the amplifier can operate from one positive rail and ground. Rail-to-rail operation also allows the input signal to approach the supply limits without requiring a separate negative supply.
Typical uses include low-voltage sensor conditioning, portable audio amplification, data-acquisition front ends, and buffering for low-voltage mixed-signal systems. Its bandwidth and slew rate make it especially appropriate for audio-frequency and moderate-frequency instrumentation. For applications requiring wider bandwidth, more output drive, or a different voltage-noise profile, compare the OPA340 against the listed alternatives before finalizing the design.
Use the manufacturer pin-description table when assigning PCB tracks and preserve the recommended input, output, and compensation network. Verify input common-mode limits, output swing, load capability, and stability at the intended supply voltage and capacitive load. A conventional PDIP footprint offers through-hole assembly, but the device's body size and pin spacing must be checked against the mechanical drawing.
This page combines the OPA340PA electrical characteristics, package details, application guidance, and qualified drop-in alternatives. It also organizes replacement and selection information around the practical constraints of rail-to-rail low-power amplifier design.
Alternatives de remplacement direct pour OPA340PA — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec OPA340PA (même facteur de forme et même empreinte) — différant par Amplifier Type, Gain-Bandwidth Product, Package, Slew Rate.
OPA344PA
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
OPA350PA
✅ Remplacement direct ⚠️ Spécifications non vérifiéesContactez-nous pour le prix
Voir la fiche technique →OPA365PA
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
OPA364PA
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
OPA380PA
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
OPA340PA Valeurs maximales et caractéristiques électriques
| Amplifier Type | Single CMOS operational amplifier |
| Number of Circuits | 1 circuit |
| Supply Configuration | Single supply |
| Rail-to-Rail Input | Yes |
| Rail-to-Rail Output | Yes, within 1 mV |
| Gain-Bandwidth Product | 5.5 MHz |
| Slew Rate | 6 V/us |
| Total Harmonic Distortion Plus Noise | 0.0007% at 1 kHz |
| Courant de repos | 750 uA per channel |
| Boîtier | 8-pin PDIP |
| Nombre de broches | 8 pins |
| Type de montage | Through-hole |
Configuration des broches de OPA340PA
| Broche 1 | NC — Not connected |
| Broche 2 | IN- — Inverting input |
| Broche 3 | IN+ — Non-inverting input |
| Broche 4 | V- — Negative supply or ground connection |
| Broche 5 | NC — Not connected |
| Broche 6 | OUT — Output |
| Broche 7 | V+ — Positive supply input |
| Broche 8 | NC — Not connected |
Applications typiques
OPA340PA convient pour 6 applications: Low-Voltage Audio Signal Conditioning, Battery-Powered Sensor Conditioning, Data-Acquisition Front End, Precision Current Measurement, Industrial Control Signal Interface, Portable Test and Measurement.
Low-Voltage Audio Signal Conditioning
OPA340PA fits low-voltage audio preamplifier and line-stage designs because its 5.5 MHz gain-bandwidth product and 6 V/us slew rate support audio-band signals while the specified THD plus noise is 0.0007% at 1 kHz. Rail-to-rail output operation reaches within 1 mV of the supply rails, increasing swing in compact single-supply designs. Place the amplifier in a non-inverting or inverting gain stage and verify the required output voltage against the load and supply limits. The 750 uA quiescent current also helps preserve battery life, although output-current capability and heat should be checked for headphone or line-output loads.
Recommandé
Battery-Powered Sensor Conditioning
OPA340PA is appropriate for portable sensor-amplifier stages that operate from a single low-voltage rail. Rail-to-rail input capability helps process sensor outputs that occupy much of the available signal range, while 750 uA quiescent current limits the amplifier's continuous overhead. The 5.5 MHz bandwidth is more than sufficient for many temperature, pressure, and inertial sensor signals and preserves the option of moderate-frequency filtering. Select input and feedback resistors for the sensor's source impedance, confirm bias-current error, and ensure the selected output voltage remains inside the amplifier's rail-to-rail swing range.
Recommandé
Data-Acquisition Front End
OPA340PA can buffer sensor and transducer outputs ahead of an ADC in a compact data-acquisition front end. Its 5.5 MHz bandwidth and 6 V/us slew rate provide ample signal-channel bandwidth for many moderate-rate conversions, while rail-to-rail operation simplifies single-supply interfacing. The amplifier can drive the ADC input and an anti-alias filter when its output-current and capacitive-load limits are respected. Place it close to the source to minimize noise pickup, verify settling time against the sampling interval, and account for input bias current, offset voltage, and common-mode range during the analog-budget calculation.
Recommandé
Precision Current Measurement
OPA340PA is suitable for instrumentation around low-level shunt measurements when the circuit operates from a low-voltage single supply. Its rail-to-rail input range can accept small differential voltages near ground, and the 5.5 MHz bandwidth supports high-bandwidth current-feedback and monitor circuits. The 6 V/us slew rate helps reproduce fast current transitions without requiring a high-speed bipolar amplifier. The low 750 uA quiescent current is useful in portable test equipment. Offset and bias-current errors must still be included in the accuracy budget, and input protection should prevent transient overvoltage from reaching the amplifier pins.
Recommandé
Industrial Control Signal Interface
OPA340PA can amplify and level-shift low-level control signals in compact industrial interface boards powered from a single rail. Rail-to-rail operation accommodates inputs near ground and outputs near the positive supply, while the 5.5 MHz bandwidth leaves ample margin for pulse-shaped control signals. The 6 V/us slew rate supports fast transitions without settling into an excessively slow response. Use appropriate input filtering for noisy factory environments, maintain a common ground reference with the sensor or controller, and validate operation across the complete input range. Protection components, resistor power ratings, and the amplifier's output-drive limit require separate review.
Recommandé
Portable Test and Measurement
OPA340PA suits portable measurement instruments where one supply rail, modest board area, and low standby consumption are important. The 750 uA quiescent current per channel reduces fixed overhead, while rail-to-rail input and output operation improves usable range on low-voltage rails. Its 5.5 MHz bandwidth and 6 V/us slew rate are suitable for waveform conditioning, active filtering, and driving moderate input impedances. For precision measurements, account for input offset, bias current, noise, and resistor tolerance. For capacitive loads or long cable connections, add isolation or filtering and confirm stable operation across the full supply and temperature range.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour OPA340PA — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | OPA344PA | OPA350PA | OPA365PA | OPA364PA | OPA380PA |
|---|---|---|---|---|---|---|
| Package | PDIP-8 | PDIP-8 | PDIP-8 | PDIP-8 | PDIP-8 | PDIP-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain-Bandwidth Product | 5.5 MHz | 10 MHz | 38 MHz | 23 MHz | 20 MHz | 90 MHz |
| Rail-to-Rail Input | Yes | Yes | Yes | Yes | Yes | Yes |
| Amplifier Count | 1 circuit | 1 circuit | 1 circuit | 1 circuit | 1 circuit | 1 circuit |
| Mounting Type | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole |
Principaux différenciateurs
- Lower-bandwidth, low-power operating point (vs OPA350PA)
- More moderate speed than the OPA365PA (vs OPA365PA)
- Compact general-purpose RRR performance (vs OPA344PA)
Notes de conception
Route the OPA340PA input and output paths to minimize pickup from switching nodes and high-current traces. Place the feedback network close to pins 2, 3, and 6, use a compact ground-return path, and avoid routing the non-inverting input beneath the IC. Because this is a low-power amplifier, excessive PCB copper area does not substitute for a stable reference design; follow the manufacturer recommended layout and pin-description table.
Do not assume that a substitute with the same PDIP footprint has identical noise, bias current, offset, output swing, or stability behavior. OPA350PA, OPA365PA, OPA364PA, and OPA380PA have substantially higher bandwidth than the OPA340PA, so input capacitance, feedback impedance, and capacitive loading can alter ringing or oscillation. Re-evaluate the noise gain and perform an oscilloscope stability test after any substitution.
Account for the 5.5 MHz bandwidth and 6 V/us slew rate when defining gain and settling requirements. A low 750 uA quiescent current does not remove the need to check output-current capability, especially when driving a load, ADC input, or capacitive cable. Keep sensitive sensor inputs away from the OPA340PA output and supply pins, and use grounded shielding or filtering where long interconnects could introduce noise or instability.
Informations de conformité
The OPA340PA is a general-purpose commercial operational amplifier; automotive qualification is not indicated. RoHS, REACH, lead-free, halogen-free, and conflict-mineral statements require confirmation from the manufacturer product documentation.