회사 블로그 Texas Instruments’ OPA377: A Low-Cost, Low-Noise, 5.5 MHz CMOS Operational Amplifier – The Ideal Choice for Precision Signal Chains

Shenzhen Mingjiada Electronics Co., Ltd. offers brand-new, genuine, in-stock Texas Instruments OPA377 (OPA377AIDCKR) low-cost, low-noise, 5.5 MHz CMOS operational amplifiers: the ideal choice for precision signal chains. We support both sample and bulk purchases.

Product Overview

In applications such as portable medical devices, precision sensor signal conditioning, and battery-powered instruments, the noise level, quiescent power consumption, and accuracy of operational amplifiers often directly determine the performance ceiling of the entire signal chain. Texas Instruments’ OPA377 series is a CMOS operational amplifier that achieves an excellent balance between low noise, low power consumption, and high precision. It is housed in an SC70-5 ultra-compact package (part number OPA377AIDCKR) and is specifically optimized for low-voltage, single-supply applications.

The OPA377 belongs to a family of wide-bandwidth CMOS amplifiers, offering a gain-bandwidth product of 5.5 MHz and a low voltage noise density of 7.5 nV/√Hz (at 1 kHz) with a quiescent current of only 0.76 mA (typical). Its exceptional combination of AC and DC performance makes it an ideal choice for applications such as small-signal conditioning, audio equipment, and active filters.

Key Technical Advantages

Ultra-Low Noise and High Accuracy

The OPA377 features an input voltage noise density of just 7.5 nV/√Hz at 1 kHz, enabling it to effectively amplify weak sensor signals without introducing significant noise. It has a maximum input offset voltage of 1 mV, an input bias current as low as 0.2 pA, and an offset voltage temperature drift of 320 nV/°C. This combination of precision makes it well-suited for applications with stringent DC accuracy requirements, such as photodiode preamplification and piezoelectric sensor signal conditioning.

Low Power Consumption, Suitable for Battery Power

The OPA377 has a quiescent current of only 0.76 mA per channel (typical) and operates within a supply voltage range of 2.2 V to 5.5 V, supporting both single-supply and dual-supply (±1.1 V to ±2.75 V) configurations. Its wide supply voltage range, combined with excellent power supply rejection ratio (PSRR), allows the device to be powered directly by an unregulated battery without the need for an additional LDO, thereby simplifying system design and extending battery life.

Rail-to-Rail Output and Unit-Gain Stability

The OPA377 features rail-to-rail output capability, enabling it to output signals close to the power supply rails and maximize dynamic range utilization. The device remains stable in a unity-gain configuration, allowing designers flexibility in building circuits such as buffers, non-inverting amplifiers, and active filters. With an output current capability of ±30 mA, it can drive certain capacitive loads.

Integrated EMI Filtering and ESD Protection

The chip features built-in EMI input filtering, which effectively suppresses the impact of radio-frequency interference on the signal chain and enhances system reliability in complex electromagnetic environments. Integrated ESD protection further enhances the device’s robustness.

Ultra-Compact Package

The OPA377AIDCKR is housed in an SC70-5 package (also known as SOT-353), measuring only approximately 2.0 mm × 1.25 mm, making it ideal for space-constrained portable devices. The series also offers SOT23-5 (OPA377AIDBVR) and SO-8 packages, as well as the dual-channel OPA2377 and quad-channel OPA4377, facilitating multi-channel system design.

Key Parameters at a Glance

Gain-Bandwidth Product: 5.5 MHz

Voltage Noise Density: 7.5 nV/√Hz @ 1 kHz

Input Offset Voltage: 1 mV (max)

Input Bias Current: 0.2 pA

Quiescent Current: 0.76 mA/channel (typical)

Supply Voltage: 2.2 V to 5.5 V (single supply); ±1.1 V to ±2.75 V (dual supply)

Slew Rate: 2 V/µs

Common-Mode Rejection Ratio: 90 dB

Output Type: Rail-to-rail

Output Current: ±30 mA

Operating Temperature: -40°C to +125°C

Package: SC70-5 (DCK)

Packaging: Tape and Reel (3,000 per reel)

Typical Applications

Thanks to its combined advantages of low noise, low power consumption, and high precision, the OPA377 is widely used in the following fields:

Photodiode Preamplification: Its ultra-low input bias current of 0.2 pA makes it an ideal front-end for photodetection systems, suitable for optical communications, spectral analysis, and medical optical sensing.

Piezoelectric Sensor Signal Conditioning: High input impedance and low-noise characteristics effectively extract the weak charge signals generated by piezoelectric sensors, making it suitable for vibration monitoring, ultrasonic detection, and touch sensing.

Portable Medical Devices: Such as heart rate monitors, pulse oximeters, and portable ECG machines. Its low power consumption extends battery life, while its low noise ensures signal quality.

Active Filters: A 5.5 MHz bandwidth and rail-to-rail output make these ideal for building multi-stage active filter circuits used in audio and sensor signal processing.

Audio Equipment: Low noise and low distortion make it suitable for microphone preamplifiers and audio signal chains.

Battery-Powered Instruments: A wide supply voltage range and high PSRR allow direct battery operation without the need for a voltage regulator, making it suitable for handheld test instruments and wireless sensor nodes.

Mingjiada Electronics—OPA377 in Stock

Established in 1996, Shenzhen Mingjiada Electronics Co., Ltd. is a globally renowned authorized independent distributor of electronic components. Headquartered in Shenzhen, the company has branches in Hong Kong, Japan, Russia, Taiwan, and other locations. With over 2 million in-stock models, the company has long distributed products from more than 500 internationally renowned semiconductor manufacturers, including TI, ADI, ST, Infineon, and NXP.

Mingjiada Electronics offers OPA377AIDCKR in full stock. All products are brand-new and factory-sealed, sourced through official channels, and of reliable quality. We support both small-batch sample requests and large-volume purchases, with lead times as short as 1–3 business days.

For the latest pricing, inventory levels, or sample requests for the OPA377, please contact the Mingjiada Electronics sales team:

Mobile: +86 13410018555 (Mr. Chen)

Email: sales@hkmjd.com

Website: www.integrated-ic.com

Address: Rooms 1239–1241, New Asia Guoli Building, Zhenzhong Road, Futian District, Shenzhen

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