TDK PositionSense Is Available: Qualify the Two-Chip BOM Before Release

What changed on 13 October 2026

TDK’s official announcement says PositionSense is now available for worldwide distribution. The company describes it as a two-chip, nine-axis sensor solution that combines a six-axis IMU, a three-axis TMR magnetometer and on-chip sensor-fusion software. The stated application set includes wearables, mobile devices, robots, drones and other products that need absolute heading or orientation.

The purchasing implication is more specific than the launch headline. “Worldwide distribution” establishes a product-availability milestone; it does not prove stock in the United Arab Emirates, Europe, the United States or any other target market. It also does not merge the two physical devices into a single MPN. The manufacturer’s PositionSense overview lists distinct IMU-plus-magnetometer combinations. A clean BOM should preserve those exact device identities, required quantities, packaging and approved-source records.

For teams moving from evaluation to an EVT, DVT or pilot build, the immediate task is to translate the platform name into a controlled configuration. That means choosing the I/O rail, bus, software branch and layout constraints before a quote or prototype order becomes the de facto design decision.

The BOM decision: 1.8 V or 1.2 V VDDIO

TDK’s product pages define two ICM-45608 combinations with different magnetometers. The ICM-45608 + ICT-15318 configuration supports I²C, SPI and I³C at 1.8 V VDDIO. The ICM-45608 + ICT-15312 configuration supports I²C and SPI at 1.2 V VDDIO. Both are described as production configurations with a ±16 g accelerometer range and ±2000 dps gyroscope range.

This is not a cosmetic suffix decision. A magnetometer change can touch the host I/O supply, level shifting, bus topology, pin assignment, driver configuration and current budget. It can also change the validation work around magnetic placement, hard-iron and soft-iron effects, enclosure materials and final-product calibration. Before the BOM is released, engineering should document why the selected voltage and interface belong in that design.

No alternative is approved by this article. Any replacement IMU or magnetometer is only a candidate and requires validation for electrical compatibility, layout, firmware, sensor fusion, magnetic performance, calibration, assembly and end-product accuracy. A distributor similarity result or family name is not an engineering approval.

What the channel snapshot does—and does not—say

The public DigiKey page for ICM-45608 identified the exact manufacturer product number, Active status and a 14-week manufacturer standard lead time. Its displayed inventory was zero, with 5,000 pieces expected on 2 March 2027. The public ICT-15312 page also showed Active status, zero inventory and a 14-week manufacturer standard lead time, while saying an estimated in-stock date was unavailable because of market conditions.

Those are useful sourcing signals, but they have a narrow boundary. They are page, region and time specific. “Manufacturer standard lead time” is not the same as a confirmed lead time on a purchase order. An expected inventory date is not a reserved allocation. Zero stock at one authorized channel does not prove a global shortage, and it should not be combined with stock from another region as if all units were available to the same buyer.

The pages also expose quantity pricing, but a same-day price table is not evidence of a price increase or decrease. Without a comparable historical baseline using the same currency, region, packaging and quantity tier, the defensible action is to request an updated quotation. The quotation should name the complete MPN, packaging, MOQ, price break, validity period, target-country availability and promised ship date.

A practical engineering and sourcing review

1. Freeze the configuration, not just the platform

Record the two exact MPNs in the BOM and schematic: ICM-45608 plus ICT-15318 for the published 1.8 V path, or ICM-45608 plus ICT-15312 for the published 1.2 V path. Add the chosen bus and I/O voltage to the design note. If the product team is still comparing both, keep them as controlled options with separate validation results rather than an “either/or” production line.

2. Review the PCB environment

The magnetometer measures the local magnetic field, so component placement is a system decision. Review distance and orientation relative to speakers, motors, inductors, magnets, high-current traces, battery conductors, shielding and ferromagnetic mechanical parts. The IMU also deserves mechanical and assembly attention: follow the manufacturer’s PCB design and MEMS assembly guidance, then verify orientation, mounting stress and vibration behavior in the actual enclosure.

3. Plan firmware and calibration evidence

Confirm the driver and sensor-fusion software release used by the prototype, the enabled interface and the output data rates. Define acceptance tests for heading accuracy, startup behavior, magnetic disturbance recovery, temperature, motion profiles and calibration retention. A successful bench read of both device IDs is a start, not a release criterion.

4. Request supply evidence for both lines

Ask an authorized source to confirm target-country ATP, lot traceability, date code, moisture handling, packaging, MOQ and delivery schedule for each device. Keep the channel snapshot date in the quote file so a later buyer can distinguish a catalog observation from a supplier commitment. If either MPN drives the build date, reflect it in the PCBA material-readiness review before reserving line time.

5. Tie procurement to the build decision

Do not place a large order only because the launch says “worldwide distribution.” Match the purchase quantity to the qualification phase and risk plan. For a prototype, buy enough traceable units for engineering samples, destructive analysis if needed, yield learning and a controlled buffer. For production, require an updated quotation and a supply plan that covers both chips; buying only the IMU does not create a complete PositionSense build.

Claims boundary: fact, judgment and recommendation

Verified facts: TDK published the worldwide-distribution announcement on 13 October 2026; PositionSense is a two-chip system; the ICM-45608/ICT-15318 page specifies 1.8 V VDDIO with I²C, SPI and I³C; the ICM-45608/ICT-15312 page specifies 1.2 V VDDIO with I²C and SPI; the cited DigiKey pages showed the exact MPNs, Active status, the displayed inventory conditions and a 14-week manufacturer standard lead-time field when checked.

Engineering judgment: the voltage, interface, magnetic environment, firmware and calibration differences make the two configurations separate release decisions. This follows from the published configuration differences and normal sensor-integration risk, but it is not a TDK statement about any reader’s specific design.

Recommendations: keep two BOM lines, confirm ATP by target country, obtain an updated quotation, and run electrical, layout, firmware, magnetic and end-product validation before production release. These are risk controls, not claims that supply will be constrained or that a design will pass.

Frequently Asked Questions

Sources

1. TDK InvenSense — PositionSense worldwide distribution announcement, 13 October 2026
2. TDK InvenSense — PositionSense overview and published configurations
3. TDK InvenSense — ICM-45608 + ICT-15318 product page
4. TDK InvenSense — ICM-45608 + ICT-15312 product page
5. DigiKey — ICM-45608 exact-MPN product page
6. DigiKey — ICT-15312 exact-MPN product page
7. DigiKey Japan — ICT-15318 exact-MPN product page