LF353DR Dual JFET-Input Operational Amplifier Overview
The LF353DR from Texas Instruments is a high-performance dual operational amplifier (op-amp) designed for low-noise signal processing in audio, industrial, and measurement applications. As part of TI??s renowned linear portfolio, it features JFET inputs to minimize noise and input bias current, making it ideal for high-impedance sources and sensitive signal chains. Its combination of wide bandwidth, low noise, and compact design has made it a staple in professional audio equipment, precision sensors, and industrial control systems. الشركة المصنعة للدوائر المتكاملة offers this reliable component as part of its portfolio of trusted analog semiconductors.
LF353DR Technical Parameters
| المعلمة | القيمة | الوحدة |
|---|---|---|
| الوظيفة | Dual Low-Noise Operational Amplifier (JFET Input) | |
| نطاق جهد الإمداد | من 5 إلى 18 | V (dual supply); 10 to 36 (single supply) |
| Quiescent Current (per amplifier) | 1.7 | mA (typical, at ??15V) |
| كسب منتج عرض النطاق الترددي | 5.0 | MHz (typical) |
| نوع الحزمة | SOIC-8 (Small Outline Integrated Circuit, 8-pin) | |
| نطاق درجة حرارة التشغيل | -40 to +85 | ??C |
الخصائص الوظيفية الرئيسية
| الخصائص | المواصفات |
|---|---|
| Input Noise Voltage (1kHz) | 25 nV/??Hz (typical) |
| تيار تحيز الإدخال | 30 pA (maximum, at 25??C) |
| Common-Mode Rejection Ratio (CMRR) | 80 dB (minimum) |
| معدل الدوران | 13 V/??s (typical) |
| Output Current (per amplifier) | 10 mA (minimum, into 1k?? load) |
Advantages Over Alternative Amplification Solutions
The LF353DR outperforms general-purpose op-amps and discrete signal chains, starting with its JFET-input design. By minimizing input bias current (30 pA max) versus BJT-input alternatives (100+ nA), it preserves signal integrity in high-impedance systems like photodiode sensors and guitar pickups. “We eliminated signal loading in our precision light meters by switching to this JFET op-amp,” notes a senior engineer at a leading test equipment manufacturer.
🔥 المنتجات الأكثر مبيعًا
With 25 nV/??Hz input noise at 1kHz, it reduces unwanted interference by 50% compared to standard op-amps (50+ nV/??Hz)??critical for audio preamps and low-level sensor signals where noise obscures data. Its 5MHz bandwidth and 13 V/??s slew rate also outpace slower op-amps, handling high-frequency audio (up to 20kHz) and fast sensor transients without distortion.
The compact SOIC-8 package (3.9mm??4.9mm) saves 40% space versus discrete low-noise setups, fitting into portable audio interfaces and industrial control modules. Unlike specialized op-amps limited to narrow voltage ranges, its ??5V?C??18V supply flexibility adapts to battery-powered devices (10V single supply) and industrial systems (??15V), reducing part counts across product lines.
🌟 المنتجات المميزة
Typical Applications of LF353DR
The LF353DR excels in low-noise, high-impedance signal processing. Key use cases include:
- Consumer Electronics (audio preamps, guitar effects pedals, home theater equalizers)
- Test and Measurement (signal conditioning for oscilloscopes, data loggers, high-impedance sensors)
- Industrial Automation (strain gauge amplifiers, piezoelectric sensor interfaces, process control loops)
- Medical Devices (EEG/ECG signal amplification, low-noise patient monitors)
- Telecommunications (receiver front-ends, low-level signal conditioning, filter circuits)
Texas Instruments?? Expertise in Analog Design
As a Texas Instruments product, the LF353DR leverages TI??s 80+ years of leadership in analog semiconductors. TI??s JFET op-amps undergo rigorous testing??including noise floor analysis across temperatures and input conditions??to ensure consistent performance. This commitment to precision has made TI a trusted partner for brands like Sony, Keysight, and Bose, who rely on components like the LF353DR for their high-performance audio and measurement systems.
📩 اتصل بنا
الأسئلة المتداولة (FAQ)
What is a JFET-input op-amp, and how does the LF353DR work?
A JFET-input op-amp uses junction field-effect transistors at its input, minimizing input bias current and noise. The LF353DR amplifies weak signals (e.g., from microphones or sensors) with low distortion, thanks to its JFET design. Its dual configuration processes two signals simultaneously, ideal for stereo audio or balanced sensor systems requiring matched performance.
Why is low input bias current (30 pA) important for high-impedance sources?
High-impedance sources (e.g., guitar pickups, photodiodes) cannot supply much current. Op-amps with high bias current would “load” these sources, altering the signal. The LF353DR??s 30 pA bias current draws negligible current, preserving signal integrity??critical for accurate measurement and audio reproduction where subtle details matter.
How does the 5MHz bandwidth benefit audio and sensor applications?
5MHz bandwidth ensures the LF353DR amplifies signals up to high frequencies without attenuation. For audio, this covers the full 20Hz?C20kHz range with headroom, preventing distortion. For sensors, it handles fast transients (e.g., pressure spikes) that slower op-amps would smooth out, ensuring accurate data capture in industrial and medical systems.
What advantages does the SOIC-8 package offer for compact designs?
The SOIC-8??s small footprint (3.9mm??4.9mm) fits into space-constrained PCBs, such as portable audio interfaces and handheld test equipment. Its surface-mount design supports automated assembly for high-volume production, while its wide pins simplify prototyping. This makes it ideal for both mass-produced consumer devices and custom instrumentation.
Why is the ??5V?C??18V supply range useful for diverse applications?
This range allows the LF353DR to operate in systems with varying power sources: 10V single supply (battery-powered devices), ??12V (audio equipment), and ??15V (industrial instrumentation). Engineers can use one op-amp across product lines, reducing inventory complexity and design time for multi-system projects.