ATSAMD21J16A-CU Equivalent & Substitute Parts

Part Overview

The ATSAMD21J16A-CU is an ARM Cortex-M0+ based 32-bit microcontroller from Microchip Technology's SAM D21J series with Functional Safety (FuSa) certification. This device integrates 64KB of FLASH memory, 8KB of RAM, and operates at 48MHz with a supply voltage range of 1.62V to 3.6V. The part is housed in a 64-UFBGA (5x5) package and is actively produced. Substitute parts may be required due to package availability, lead time constraints, or specific application mounting requirements while maintaining electrical and functional compatibility.

Substiute Parts

ATSAMD21J16A-CU

Microchip TechnologyIn Stock: 1121ATSAMD21J16A-CU Datasheet

Current PartRFQ

ATSAMD21J16B-AU

Microchip TechnologyIn Stock: 3081ATSAMD21J16B-AU Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ATSAMD21J16A-CU is based on strict electrical and functional equivalence within the SAM D21J series. The substitute part ATSAMD21J16B-AU maintains identical core specifications including processor architecture, memory configuration, speed, I/O count, voltage supply range, data converter specifications, connectivity options, and peripheral set. The primary difference is the package format: the main part uses 64-UFBGA (5x5) while the substitute uses 64-TQFP (10x10). Both packages provide the same 52 I/O pins and are compatible with the same firmware and application requirements. Substitution is valid when PCB layout and mounting infrastructure can accommodate the different package geometry.

Parameter Comparison

Engineering Selection Recommendations

Both the ATSAMD21J16A-CU and ATSAMD21J16B-AU are active products from Microchip Technology with identical electrical specifications and functional capabilities. Selection between these parts is determined by PCB design requirements and package compatibility. The ATSAMD21J16A-CU in 64-UFBGA format provides a smaller footprint suitable for space-constrained applications. The ATSAMD21J16B-AU in 64-TQFP format offers conventional through-hole compatible lead spacing and may be preferred for applications requiring manual rework or testing. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility across manufacturing regions.

Frequently Asked Questions (FAQ)

Q: Are ATSAMD21J16A-CU and ATSAMD21J16B-AU firmware compatible? A: Yes. Both parts use identical ARM Cortex-M0+ processor cores, memory configurations, and peripheral sets. Firmware compiled for one part executes identically on the other without modification.

Q: What is the primary difference between these substitute parts? A: The package format differs. ATSAMD21J16A-CU uses 64-UFBGA (5x5) with a smaller footprint, while ATSAMD21J16B-AU uses 64-TQFP (10x10) with larger lead spacing. Both provide 52 I/O pins with identical electrical characteristics.

Q: Can I substitute ATSAMD21J16B-AU for ATSAMD21J16A-CU on an existing PCB? A: No. The different package geometries require different PCB layouts, footprints, and via patterns. PCB redesign is necessary to accommodate the alternative package.

Q: Do both parts support the same supply voltage range? A: Yes. Both parts operate across 1.62V to 3.6V supply voltage range with identical electrical specifications.

Q: Are there any differences in peripheral functionality between these parts? A: No. Both parts include identical peripheral sets: Brown-out Detect/Reset, DMA, I2S, POR, PWM, and WDT, with the same I/O count of 52 pins.

Q: Which part should I select for high-volume production? A: Selection depends on manufacturing infrastructure. The 64-UFBGA format supports higher density PCB designs, while 64-TQFP may offer cost advantages in certain manufacturing environments. Consult with your PCB assembly partner regarding equipment capabilities and lead times.