BMA421

BMA421 Overview

BMA421 is a Bosch Sensortec 12-bit digital triaxial accelerometer with embedded motion features supplied in 12-land LGA, 2 mm × 2 mm × 0.95 mm. This page uses the exact orderable code because package, grade, temperature and option suffixes can change compatibility.

Key Technical Specifications

Package and Ordering Notes

The listed package is 12-land LGA, 2 mm × 2 mm × 0.95 mm with 12 pins, leads, lands or contacts. The featured image is a generic package illustration for form-factor identification and is not an actual date-code or lot photograph. Lifecycle is recorded as Obsolete; confirm current factory support and last-time-buy constraints before design-in.

Sourcing Guidance

BMA421 is a legacy or obsolete orderable code. Source only with date-code, label, package and traceability checks appropriate to the application.

For an accurate quotation, include the full MPN, target quantity, acceptable date-code range, packaging format and destination. Icearth can help review traceability documents, label photos and electrical/package alignment before order placement.

Manufacturer Documentation

Technical values were checked against Bosch Sensortec documentation. Use the linked datasheet as the controlling source and re-check revisions before PCB release or firmware qualification.

How BMA421 differs from related orderable parts

BMA421 belongs to the BMA421 family. Compared with BMA455, the recorded differences include functional description: 12-bit digital triaxial accelerometer with embedded motion features versus 16-bit digital triaxial accelerometer with embedded wearable features; Resolution: 12 bit, a lower recorded value than 16 bit; and FIFO: 1 KB rather than 1 KB family architecture. A shared family name does not establish pin, firmware or qualification compatibility.

For an RFQ or AVL review, quote the complete BMA421 code and verify the manufacturer ordering table, package drawing, packing method and revision. The related numbers above are comparison references, not declared drop-in replacements.

BMA421 selection and design context

BMA421 is cataloged as a Accelerometer in the BMA421 family. Its recorded function is 12-bit digital triaxial accelerometer with embedded motion features. Selection should be based on the complete electrical limits, package drawing and ordering suffix rather than the abbreviated family code.

• Resolution: 12 bit. Use the worst-case datasheet limit rather than a typical headline value.
• Measurement Ranges: ±2 g, ±4 g, ±8 g and ±16 g. Confirm the value and its datasheet test conditions for the exact ordering suffix.
• Digital Interface: I²C and SPI. Confirm logic levels, signaling mode, host support and required external components.
• Supply Voltage: 1.62 V to 3.6 V. Check rail compatibility, tolerance and sequencing under worst-case conditions.

Application and qualification considerations

When evaluating this sensor, confirm measurement range, sensitivity, noise, output data rate, interface voltage, calibration needs and mechanical orientation. For a new design, review power-up behavior, interface timing, absolute maximum ratings, thermal limits and any external-component requirements in the latest manufacturer documentation. Existing-board replacement work should additionally confirm pinout, footprint, firmware assumptions and qualification grade.

Procurement checks for BMA421

The recorded package is 12-land LGA, 2 mm × 2 mm × 0.95 mm, the temperature range is -40°C to +85°C, and the lifecycle status is Obsolete as of 2026-07-18. Before ordering, confirm the exact MPN on the label, packing format, quantity, date-code requirements, traceability documents and current factory status.

BMA421 FAQ