HEF4021BT-Q100J

Shift Registers Overview

The HEF4021BT-Q100J is an 8-bit static shift register (parallel-to-serial converter) from the HEF4021B-Q100 series. It features a synchronous serial data input (DS), clock input (CP), and asynchronous active HIGH parallel load input (PL). The device includes eight asynchronous parallel data inputs (D0 to D7) and buffered parallel outputs from the last three stages (Q5 to Q7). Each stage utilizes a D-type master-slave flip-flop with set direct (SD) and clear direct (CD) inputs. It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS.

Shift Registers Feature Summary

• Automotive product qualification in accordance with AEC-Q100 Grade 1 standard
• Fully static operation with CMOS low power dissipation
• High noise immunity tolerant of slower rise and fall times via Schmitt trigger action
• ESD protection exceeding 2000 V for HBM and 1000 V for CDM

Shift Registers Applications

• Suitable for use in automotive applications
• Parallel-to-serial data conversion
• Digital logic circuits requiring static shift registers

Shift Registers Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the HEF4021B-Q100 series includes multiple variants such as SO16 (SOT109-1) and TSSOP16 (SOT403-1). Confirm the temperature range specification aligns with design requirements, noting the -40 °C to +125 °C rating for the BT variant. Ensure compliance with JEDEC standard JESD 13-B and relevant automotive qualification standards during component selection.

Shift Registers Selection Notes

Select this component when an 8-bit parallel-to-serial converter with automotive qualification is required. The device supports a wide supply voltage range from 3.0 V to 15.0 V. Consider the buffered parallel outputs available on the last three stages if simultaneous multi-bit output is needed. Verify that the package dimensions fit the PCB layout constraints for the chosen SO16 or TSSOP16 option.

Shift Registers Part Context

The HEF4021BT-Q100J belongs to the Nexperia HEF4021B-Q100 family of 8-bit static shift registers. This family is designed for robust performance in demanding environments, featuring standardized symmetrical output characteristics. The product complies with JEDEC standard JESD 13-B and offers comprehensive ESD protection capabilities suitable for sensitive electronic systems.

Shift Registers Replacement Considerations

HEF4021BTT-Q100 (TSSOP16 package)