LM2904DR Dual Operational Amplifier Overview
The LM2904DR from Texas Instruments is a robust dual operational amplifier (op-amp) engineered for general-purpose analog signal processing in rugged environments. Part of TI??s trusted linear portfolio, it integrates two high-performance op-amps in a compact package, offering low power consumption, wide voltage range, and reliable operation??making it ideal for automotive, industrial, and consumer applications. Its versatility and durability have made it a go-to choice for engineers needing consistent signal amplification in harsh conditions. Fabricante de CI offers this essential component as part of its portfolio of trusted analog semiconductors.
LM2904DR Technical Parameters
| Parámetro | Valor | Unidad |
|---|---|---|
| Función | Dual General-Purpose Operational Amplifier | |
| Rango de tensión de alimentación | 3.0 to 30 | V (single supply); ??1.5 to ??15 (dual supply) |
| Quiescent Current (per amplifier) | 0.4 | mA (typical, at 5V) |
| Ganancia Ancho de banda Producto | 1.0 | MHz (típico) |
| Tipo de envase | SOIC-8 (Small Outline Integrated Circuit, 8-pin) | |
| Temperatura de funcionamiento | -40 a +125 | ??C |
Características funcionales clave
| Característica | Especificación |
|---|---|
| Tensión de offset de entrada | 3.0 mV (maximum, at 25??C) |
| Corriente de polarización de entrada | 45 nA (maximum, at 25??C) |
| Relación de rechazo en modo común (CMRR) | 65 dB (minimum) |
| Velocidad de giro | 0,6 V/s (típico) |
| Output Current (per amplifier) | 20 mA (minimum, into 1k?? load) |
Ventajas sobre otras soluciones de amplificación
The LM2904DR outperforms single op-amps and specialized alternatives, starting with its integrated dual design. By combining two op-amps in one SOIC-8 package, it reduces PCB space by 40% compared to using two discrete single op-amps??critical for space-constrained automotive ECUs and industrial control modules. “We reduced component count by 25% in our vehicle sensor hubs by switching to this dual op-amp,” reports a senior engineer at a leading automotive Tier 1 supplier.
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With 0.4mA quiescent current per channel, it consumes 50% less power than high-performance op-amps (1.0mA+), extending battery life in portable industrial sensors and reducing energy use in always-on automotive systems. Its 3V?C30V supply range eliminates the need for voltage regulators in 12V car systems and 24V industrial rails, simplifying power design.
Unlike precision op-amps requiring external components for stability, the LM2904DR is unity-gain stable, making it ideal for cost-sensitive projects where design complexity must be minimized. Its -40??C to +125??C temperature range withstands under-hood automotive temperatures and industrial freezers, outperforming commercial-grade op-amps limited to 0??C?C70??C.
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Typical Applications of LM2904DR
The LM2904DR excels in rugged analog signal processing across industries. Key use cases include:
- Automotive Electronics (sensor signal conditioning, fuel level monitors, HVAC control circuits)
- Industrial Automation (pressure transducer amplification, motor control feedback loops, PLC input stages)
- Home Appliances (washing machine water level sensors, oven temperature control, smart thermostat circuits)
- Energy and Power (battery voltage monitors, solar panel charge controllers, power supply regulation)
- Security and Surveillance (motion sensor signal amplification, camera power management)
Texas Instruments Experiencia en diseño analógico
As a Texas Instruments product, the LM2904DR leverages TI??s 80+ years of leadership in analog semiconductors. TI??s op-amps undergo rigorous testing??including 1,000+ hours of temperature cycling, vibration stress, and voltage margin tests??to ensure reliability in harsh environments. This commitment has made TI a trusted partner for brands like Ford, Siemens, and Whirlpool, who rely on components like the LM2904DR for their durability and performance.
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Preguntas más frecuentes (FAQ)
What is a dual operational amplifier, and how does the LM2904DR work?
A dual op-amp integrates two independent operational amplifiers in one package, enabling two separate signal processing tasks in a compact space. The LM2904DR amplifies weak analog signals (e.g., from sensors) to levels usable by microcontrollers, with each amplifier configurable for functions like voltage following, filtering, or comparison??critical for systems needing multiple signal paths.
Why is the 3V?C30V supply range important for automotive and industrial designs?
This range allows the LM2904DR to operate from common rugged power sources: 12V car batteries, 24V industrial rails, and 3V backup batteries. Unlike fixed-voltage op-amps, it avoids voltage conversion, reducing power loss and component count. This versatility makes it a single solution for multiple product lines, lowering inventory costs.
How does the SOIC-8 package benefit automotive and industrial PCBs?
The SOIC-8??s compact size (3.9mm??4.9mm) fits into dense automotive ECUs and industrial control boards where space is limited by connectors and power components. Its surface-mount design supports automated assembly, critical for high-volume automotive production, while its wide pins simplify manual repair in field service scenarios.
Why is the LM2904DR suitable for under-hood automotive applications?
Its -40??C to +125??C operating range withstands extreme temperature fluctuations in engine bays. Low power consumption (0.4mA) minimizes drain on car batteries, and its robust design resists voltage spikes common in automotive electrical systems. These traits make it reliable for critical sensors and control circuits.
What does “unity-gain stable” mean, and why is it useful?
Unity-gain stable means the op-amp can operate with a gain of 1 (no amplification) without oscillating, eliminating the need for external compensation components. This simplifies design for engineers working on cost-sensitive or space-constrained projects, as fewer components are required, and circuit tuning is minimized.