TDK Launches Stray-Field Immune Hall Sensor for EV Motors

Why It Matters

The HAL 3025 reduces hardware complexity and shielding costs while delivering safety‑grade position feedback, accelerating EV power‑train integration and compliance with stringent automotive standards.

Key Takeaways

• HAL 3025 offers stray‑field immunity up to 60,000 rpm
• ASIL‑D ready SEooC component simplifies functional‑safety compliance
• Eliminates magnetic shielding, reducing system size and cost
• Analog sine/cosine outputs enable low‑latency position feedback
• SOIC‑8 package compatible with existing HAL 3020/3021 families

Pulse Analysis

TDK’s new HAL 3025 sensor addresses a growing bottleneck in electric‑vehicle power‑train design: reliable position sensing amid intense electromagnetic noise. By leveraging SixSense technology to isolate the vertical magnetic field component, the device maintains accurate 360° feedback even when exposed to external DC and AC stray fields. This capability is crucial for motors spinning at up to 60,000 rpm, where traditional Hall sensors can suffer from signal distortion, limiting torque precision and efficiency.

Beyond raw performance, the HAL 3025’s ASIL‑D readiness marks a strategic shift toward streamlined functional‑safety integration. Certified as a safety‑element‑out‑of‑context (SEooC) under ISO 26262:2018, it embeds diagnostics such as wire‑break and over‑voltage detection, allowing OEMs to meet ISO 26262 and ISO 11452‑8 requirements without adding separate safety chips. The analog sine/cosine outputs provide low‑latency, high‑bandwidth data that can be directly consumed by ECUs or microcontrollers, cutting board‑level complexity and reducing bill‑of‑materials overhead.

The market impact is immediate: automotive suppliers can now design more compact, cost‑effective x‑by‑wire systems—steer‑by‑wire, brake‑by‑wire, and high‑voltage traction—without bulky magnetic shielding. TDK’s decision to keep the sensor in an SOIC‑8 package compatible with its existing HAL 3020/3021 line eases adoption for current designs, accelerating time‑to‑market. With volume production slated for Q2 2026, the HAL 3025 positions TDK as a key enabler of the next generation of EV architectures, where space, weight, and safety are paramount.