MMA3221KEG Equivalent & Substitute Parts

Part Overview

The MMA3221KEG is a dual-axis analog accelerometer manufactured by NXP USA Inc., designed for automotive-grade motion sensing applications. This device measures acceleration on X and Y axes with ranges of ±50g and ±20g respectively, outputting analog voltage signals at 400Hz bandwidth. The MMA3221KEG is classified as obsolete, making identification of active equivalent parts essential for new designs and production continuity.

Substiute Parts

MMA3221KEG

NXP USA Inc.In Stock: 1058MMA3221KEG Datasheet

Current PartRFQ

MMA6813BKCWR2

NXP USA Inc.In Stock: 5564MMA6813BKCWR2 Datasheet

MFR RecommendedRFQ

MMA6813BKCWR2

NXP USA Inc.In Stock: 5564MMA6813BKCWR2 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The MMA6813BKCWR2 is identified as a manufacturer-recommended substitute for the MMA3221KEG. Substitution eligibility is determined by the following parameters:

Common Substitution Criteria:

• Dual-axis acceleration measurement (X, Y axes)
• ±50g acceleration range on X axis
• Automotive-grade classification
• AEC-Q100 qualification
• Surface mount technology
• ROHS3 compliance
• Identical manufacturer (NXP USA Inc.)

Key Differences Requiring Design Consideration:

• Output interface: Analog Voltage (MMA3221KEG) versus SPI Digital (MMA6813BKCWR2)
• Y-axis range: ±20g (MMA3221KEG) versus ±50g (MMA6813BKCWR2)
• Package type: 20-SOIC versus 16-QFN
• Operating temperature upper limit: 125°C (MMA3221KEG) versus 105°C (MMA6813BKCWR2)
• Supply voltage range: 4.75V ~ 5.25V (MMA3221KEG) versus 3.135V ~ 5.25V (MMA6813BKCWR2)

Parameter Comparison

Engineering Selection Recommendations

The MMA6813BKCWR2 is an active product with current manufacturing support, whereas the MMA3221KEG is obsolete. Both devices maintain automotive-grade classification and AEC-Q100 qualification, ensuring compliance with automotive reliability standards.

Selection between these parts requires evaluation of the following factors:

Interface Compatibility: The MMA3221KEG outputs analog voltage signals, while the MMA6813BKCWR2 uses SPI digital communication. Existing analog signal conditioning circuits cannot directly interface with the MMA6813BKCWR2 without redesign to accommodate SPI protocol and digital signal processing.

Acceleration Range: The MMA3221KEG provides asymmetric ranges (±50g X-axis, ±20g Y-axis), while the MMA6813BKCWR2 provides symmetric ±50g on both axes. Applications requiring the specific ±20g Y-axis limit of the MMA3221KEG must verify that the ±50g range of the MMA6813BKCWR2 is acceptable.

Temperature Operating Range: The MMA3221KEG operates to 125°C, while the MMA6813BKCWR2 operates to 105°C. Applications requiring operation above 105°C cannot use the MMA6813BKCWR2.

Supply Voltage: The MMA6813BKCWR2 accepts lower supply voltages (3.135V minimum) compared to the MMA3221KEG (4.75V minimum), providing greater flexibility in power supply design.

Package Footprint: The transition from 20-SOIC to 16-QFN requires PCB layout modification and updated assembly procedures.

Frequently Asked Questions (FAQ)

Q: Can the MMA6813BKCWR2 directly replace the MMA3221KEG in existing designs?

A: Direct replacement is not possible without circuit redesign. The MMA3221KEG outputs analog voltage signals suitable for analog-to-digital converters or analog signal conditioning circuits. The MMA6813BKCWR2 outputs digital SPI signals, requiring microcontroller or SPI interface circuitry. Additionally, the package change from 20-SOIC to 16-QFN requires PCB layout modification.

Q: What are the key electrical differences between these parts?

A: The MMA3221KEG operates with a supply voltage range of 4.75V to 5.25V, while the MMA6813BKCWR2 accepts 3.135V to 5.25V. The MMA3221KEG provides asymmetric acceleration ranges (±50g X-axis, ±20g Y-axis), whereas the MMA6813BKCWR2 provides symmetric ±50g on both axes. The MMA3221KEG operates to 125°C maximum, while the MMA6813BKCWR2 operates to 105°C maximum.

Q: Are both parts automotive-qualified?

A: Yes. Both the MMA3221KEG and MMA6813BKCWR2 carry automotive-grade classification and AEC-Q100 qualification, meeting automotive reliability and quality standards.

Q: What is the significance of the product status difference?

A: The MMA3221KEG is classified as obsolete, indicating that NXP USA Inc. has discontinued manufacturing and will not produce additional units. The MMA6813BKCWR2 is active, meaning it is currently manufactured and available for new designs. For long-term production continuity, the active MMA6813BKCWR2 is the preferred choice.

Q: How do the package types differ?

A: The MMA3221KEG uses a 20-SOIC package (0.295" width, 7.50mm), while the MMA6813BKCWR2 uses a 16-QFN package with exposed pad (6x6mm). The QFN package is smaller and requires different PCB layout, solder reflow profiles, and assembly handling procedures compared to SOIC.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 and HTSUS 8542.39.0001. Moisture sensitivity levels are identical at MSL 3 (168 Hours). No compliance or certification differences exist between the two parts.