In depth analysis: KRL3216T4A-M-R010-FT1 four terminal current detection resistor
Are you troubled by the accuracy and stability of current measurement in precision circuit design? Especially in demanding applications such as automotive electronics and high current power management, a high-performance sampling resistor is often the key to ensuring system reliability. The KRL3216T4A-M-R010-FT1 we are going to analyze in detail today is a high-precision, four terminal metal foil current detection resistor designed by Susumu Corporation in Japan to address such challenges.
Product Overview: Specially designed for precision current measurement
KRL3216T4A-M-R010-FT1 is not an ordinary surface mount resistor. It belongs to the Susumu KRL series and is a precision component specifically designed for current sampling and shunt measurement. Its core mission is to accurately and stably detect current in the circuit, and convert the current value into a small voltage signal that can be read by the monitoring circuit. This KRL3216T4A-M-R010-FT1 resistor adopts advanced four terminal (Kelvin connection) design and metal foil technology, which can effectively eliminate the influence of lead resistance and contact resistance on measurement accuracy, especially suitable for occasions with extremely high measurement accuracy requirements.
Detailed explanation of core parameters
To fully understand the performance of KRL3216T4A-M-R010-FT1, we need to interpret its key parameters one by one. The following table summarizes its main technical specifications:
Parameter Category Parameter Value Description and Significance
The resistance value and accuracy are 10m Ω (0.01 Ω) ± 1%. The extremely low resistance value is used for high current sampling, and the high accuracy of ± 1% ensures measurement reliability.
The rated power of 1W provides high power processing capability in the 1206 package size.
The temperature coefficient (TCR) ± 35ppm/° C indicates that for every 1 ° C change in temperature, the resistance change does not exceed ± 0.0035%, with extremely low temperature drift and stable performance.
The package size is 1206 (3.2mm x 1.6mm) wider than the standard 1206 package, which is beneficial for heat dissipation and withstanding greater power.
The working temperature range is designed with a wide temperature range of -55 ° C to+155 ° C, which can meet the application needs of extreme environments such as automobiles and industries.
Key features include four terminals, metal foil, and AEC-Q200 certified four terminals for precise Kelvin testing; Metal foil provides low TCR and high stability; AEC-Q200 certification represents its compliance with automotive grade reliability standards.
Unique design features and advantages
The outstanding performance of KRL3216T4A-M-R010-FT1 in the field of precision measurement is attributed to its multiple unique designs:
Four terminal (Kelvin) connection: This is the core design of KRL3216T4A-M-R010-FT1. It has two independent terminals - one for carrying the main current (current terminal) and the other for accurately detecting the voltage across the resistor (voltage detection terminal). This structure separates the measurement circuit from the power circuit, fundamentally avoiding measurement errors introduced by lead voltage drop.
Metal foil resistance technology and low TCR: using special metal foil as the resistance material. This material itself has excellent temperature stability, allowing KRL3216T4A-M-R010-FT1 to achieve a temperature coefficient as low as ± 35ppm/° C. This means that under severe environmental temperature changes, its resistance value remains almost unchanged, ensuring measurement consistency across the entire temperature range.
Automotive grade reliability and wide temperature operation: This resistor has passed AEC-Q200 certification, which is the authoritative standard for reliability testing of automotive electronic components. Combining its operating temperature range of -55 ° C to 155 ° C, KRL3216T4A-M-R010-FT1 is fully capable of adapting to harsh automotive electronic environments such as engine compartments and chassis, while also being suitable for harsh industrial applications.
Typical application scenarios
With high precision, stability, and reliability, KRL3216T4A-M-R010-FT1 plays an important role in multiple cutting-edge fields:
Automotive electronics: Used in battery management systems (BMS), motor drive controllers, DC-DC converters for electric vehicles (EV) and hybrid electric vehicles (HEV) to accurately monitor charging and discharging currents and operating currents, ensuring vehicle safety and efficiency.
Industrial and Power Management: Suitable for server power supplies, communication base station power supplies, photovoltaic inverters, industrial frequency converters and other equipment, to achieve precise monitoring of output current and overcurrent protection.
Consumer Electronics and Computers: Power Management Units (PMICs) used for smartphones, laptops, tablets, as well as high-precision components such as Hard Disk Drives (HDDs) that require power monitoring.
Selection comparison and precautions
In Susumu's KRL series, in addition to the 10m Ω model KRL3216T4A-M-R010-FT1, there are also options with different resistance values such as KRL3216T4A-M-R009-F-T1 (9m Ω) and KRL3216T4A-M-R100-F-T1 (100m Ω). Their packaging and basic characteristics are similar, but their power and resistance values are different. Engineers can choose according to specific current ranges and voltage drop requirements.
When using KRL3216T4A-M-R010-FT1 in design, special attention should be paid to:
PCB layout: To fully leverage the advantages of four terminals, voltage detection wiring should be connected to the detection chip using independent and shortest possible wiring, and kept at a distance from high current wiring to reduce interference.
Heat dissipation considerations: Although the power is 1W, heat dissipation still needs to be considered when operating continuously at high currents. Fully utilize the characteristics of its wide body packaging and design appropriate heat dissipation copper foil on the PCB.
summary
Overall, KRL3216T4A-M-R010-FT1 is a high-end surface mount resistor optimized for high-precision current detection. It solves many pain points in precision measurement through four terminal Kelvin connection, excellent metal foil low TCR technology, and automotive grade reliability certification. Whether facing the harsh environmental challenges in automotive electronics or the ultimate pursuit of efficiency and safety in industrial power supplies, KRL3216T4A-M-R010-FT1 can provide stable and reliable current measurement solutions. For any advanced electronic system design that requires precise monitoring of current, this resistor is a core component worth considering.
