Texas Instruments INA1651QPWRQ1 Amperímetro de deteção de corrente, 8-TSSOP ?C Grau Automóvel

INA1651QPWRQ1 Automotive Current Sense Amplifier Overview

The INA1651QPWRQ1 from Texas Instruments is a high-performance current sense amplifier engineered specifically for automotive applications. This device excels at accurately measuring small voltage drops across shunt resistors, providing critical current data for power management and system protection. Fabricante de CI offers this automotive-qualified component as part of its portfolio of reliable sensing solutions for demanding environments.

Technical Parameters of INA1651QPWRQ1

Parâmetro	Valor	Unidade
Rácio de rejeição de modo comum (CMRR)	120	dB (min, DC to 1kHz)
Corrente quiescente	1.2	mA (max)
Gama de tensão de entrada	-0.3 to +76	V
Gain Accuracy	??0.5	% (max)
Tipo de embalagem	8-TSSOP (Thin Shrink Small Outline Package)

Caraterísticas de funcionamento

Caraterística	Especificação
Gama de temperaturas de funcionamento	-40??C a +125??C
Gama de tensão de alimentação	2.7V to 36V
Largura de banda	500kHz
Variação da tensão de saída	0.1V to (VCC – 0.1V)
Qualificação automóvel	AEC-Q100 Grade 1

Advantages Over Alternative Current Sense Amplifiers

The INA1651QPWRQ1 outperforms conventional current sense amplifiers in automotive environments. Its 120dB CMRR is significantly higher than many alternatives, enabling accurate current measurements even in the presence of large common-mode voltages??critical in automotive systems with 12V, 24V, or 48V power nets.

Compared to general-purpose amplifiers repurposed for current sensing, its ??0.5% gain accuracy ensures consistent measurement across temperature extremes, eliminating the need for calibration in production. This reduces manufacturing costs while maintaining reliability in safety-critical applications.

Its 1.2mA quiescent current is lower than many automotive-grade alternatives, reducing power consumption in always-on systems like battery management. The 8-TSSOP package also saves PCB space compared to larger through-hole alternatives, a key advantage in densely packed automotive electronic control units (ECUs).

Unlike non-qualified components, its AEC-Q100 Grade 1 certification guarantees performance from -40??C to +125??C, ensuring reliability in underhood environments where temperatures fluctuate dramatically.

Typical Applications of INA1651QPWRQ1

The INA1651QPWRQ1 excels in automotive systems requiring precise current monitoring. Key use cases include:

• Electric vehicle (EV) and hybrid battery management systems
• Automotive power distribution modules
• Motor control systems (window, seat, and pump motors)
• LED lighting current regulation
• Overcurrent protection circuits in ECUs

Texas Instruments?? Automotive Expertise

As a Texas Instruments product, the INA1651QPWRQ1 benefits from the company??s decades of experience in automotive semiconductors. TI is a trusted supplier to the automotive industry, with components meeting strict quality and reliability standards. Each INA1651QPWRQ1 undergoes rigorous testing to ensure compliance with AEC-Q100 Grade 1 requirements, making it suitable for safety-critical applications where failure is not an option.

Perguntas frequentes (FAQ)

What makes the INA1651QPWRQ1 suitable for automotive applications?

Its AEC-Q100 Grade 1 qualification ensures operation from -40??C to +125??C, with robust design to withstand automotive electrical transients. This makes it reliable in harsh environments like engine bays, where temperature extremes and voltage spikes are common.

Why is 120dB CMRR important for current sensing in vehicles?

CMRR measures noise rejection. 120dB allows the amplifier to ignore large common-mode voltages (like 12V or 48V power rails) while accurately measuring small shunt voltages (mV range), ensuring precise current data for battery management and system protection.

How does the low quiescent current benefit automotive systems?

At 1.2mA max, it minimizes power draw in always-on systems, preserving battery life when the vehicle is off. This is critical for modern cars with numerous standby systems, where parasitic power consumption directly impacts battery longevity.

What advantages does the 8-TSSOP package offer for automotive PCBs?

The 8-TSSOP package??s compact size saves space on densely packed automotive ECUs, allowing more functionality in limited space. Its surface-mount design also enables automated assembly, improving manufacturing efficiency and consistency.

Can the INA1651QPWRQ1 handle the voltage ranges found in electric vehicles?

Yes, its input voltage range (-0.3V to +76V) accommodates common automotive power nets, including 12V, 24V, and 48V systems used in EVs and hybrids. This versatility eliminates the need for additional voltage clamping components, simplifying designs.