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Yiyi123

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  1. STMicroelectronics has introduced two high-speed digital-input current limiters that set new standards for circuit protection in factory automation. The SCLT3-8BQ7 and CLT01-38SQ7 provide industrial Programmable Logic Controllers (PLCs) – the “brains” of smart factories and industrial robots – with fast, robust protection against unwanted input-signal current spikes while reducing power consumption, board space, and component costs. The new devices meld ST’s long-standing leadership in Transient Voltage Suppressors with its state-of-the-art packaging technology. Both devices are housed in the highly compact QFN-48L (7x7mm) package with a large exposed thermal pad that optimizes power dissipation at ambient temperatures greater than 100ºC. Key technical features include: 8 high-speed SPI protected outputs; 8/16-bit high-speed SPI output; High-side inputs with common ground; Integrated 5V regulator; 30V+ reverse polarity protection; Energy-free LED output signal for visual status indication; 78mW/channel power-dissipation capability; Temperature/voltage alarm options. The high-speed inputs and outputs are fully compliant with the requirements of best-in-class PLCs. The CLT01-38SQ7 also delivers robustness compliant with the most stringent international EMC (Electromagnetic Compatibility) standards such as IEC 61000-4.2, IEC61000-4.4, and IEC6100-4.5.
  2. Allegro MicroSystems Europe announces its first ever 1MHz bandwidth Hall-effect current sensor IC with a lightning fast 210 ns response time. The ACS730 provides an economical and precise solution for AC or DC current sensing. Allegro’s ACS730 is targeted at industrial, commercial, and communications systems. Typical applications include motor control, load detection and management, switched-mode power supplies, and over-current fault protection. This device consists of a precise, low-offset, linear Hall-sensor circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which is sensed by the integrated Hall IC and converted into a proportional voltage. Device accuracy is optimised through the close proximity of the magnetic field to the Hall transducer. A precise, proportional voltage is provided by the Hall IC, which is programmed for accuracy after packaging. The output of the device has a positive slope when an increasing current flows through the primary copper conduction path (from pins 1 and 2, to pins 3 and 4), which is the path used for current sensing. The internal resistance of this conductive path is typically 1.2 mΩ, providing low power loss. The terminals of the conductive path are electrically isolated from the sensor leads (pins 5 through 8). This allows the ACS730 current sensor IC to be used in high-side current sense applications without the use of high-side differential amplifiers or other costly isolation techniques. The ACS730 is provided in a small, low-profile surface-mount SOIC-8 package. The lead frame is plated with 100% matt tin, which is compatible with standard lead (Pb) free printed-circuit-board assembly processes. Internally, the device is Pb-free, except for flip-chip high-temperature Pb-based solder balls, currently exempt from RoHS. The device is fully calibrated prior to shipment from the factory.
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