AS8221-ASSP

Specialized Overview

The AS8221 is a high-speed automotive FlexRay transceiver conforming to the FlexRay Electrical Physical Layer Specification V2.1 Rev B, operating as a bidirectional interface between the communication controller and twisted-pair copper wiring. It supports data transfer up to 10 Mbps with excellent EMC performance. The device features an optimized host controller interface with three low-active pins: Enable (EN), Standby (STBN), and Error (ERRN). It provides NORMAL, RECEIVE-ONLY, STANDBY, SLEEP, and POWER-OFF modes. Supply voltages include VBAT (5.5V to 50V), VCC (4.75V to 5.25V), and VIO (2.2V to VCC). Current consumption in low-power modes is typically 6 µA for VBAT and 8 µA for VCC at 125°C. The package is a lead-free SSOP20.

Specialized Feature Summary

• Compliant with FlexRay Electrical Physical Layer Specification V2.1 Rev B
• Supports 12V and 24V systems with very low sleep current
• Integrated power management system with two inhibit pins for external voltage supply control
• Automatic thermal shutdown protection and protection against short circuit conditions on the bus

Specialized Applications

• Automotive FlexRay nodes requiring bus wake-up and voltage regulator control
• ECUs connected to permanent battery supply (clamp 30)
• Wake-up components with very low power consumption in SLEEP mode

Specialized Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package type and temperature range compatibility. Confirm that the component meets AEC-Q100 qualification requirements for your target automotive application environment. Cross-reference pin assignments with the latest datasheet revision to avoid integration errors during PCB layout.

Specialized Selection Notes

Select this transceiver for applications requiring strict adherence to FlexRay V2.1 Rev B standards. Ensure the microcontroller interface levels match the supported VIO range of 2.5V, 3V, 3.3V, or 5V. Verify that the system design accommodates the required external voltage regulators controlled by the INH1 and INH2 pins for optimal power management in low-power modes.

Specialized Part Context

The AS8221 is part of the FlexRay Standard Transceiver family from ams-OSRAM USA INC. It is designed specifically for safety-critical automotive environments, providing robust communication over twisted-pair networks. The device integrates bus guardian interfaces and thermal monitoring to ensure reliable operation under extreme conditions, making it suitable for advanced driver assistance systems and vehicle control units.

Specialized Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.