Panasonic has extended its ETQPMY series of high‑performance power inductors for automotive applications with three new AEC‑Q200‑qualified SMD parts. The additions close important gaps in inductance, size and current ratings for high‑temperature, high‑reliability power stages in modern vehicles.
Key features and benefits
Panasonic’s ETQPMY power inductor series targets demanding automotive DC‑DC converters and noise filters where high temperature, high current and strong vibration resistance are critical. The new part numbers maintain the existing platform’s combination of ferrous‑alloy magnetics, low loss and robust mechanical design.
Key features of the ETQPMY automotive power inductors include:
- Ferrous alloy magnetic core material with high saturation flux density (Hi‑BS) for stable inductance under high DC bias currents
- High heat resistance suitable for automotive under‑hood and powertrain environments
- Excellent DC bias characteristics, enabling compact designs without excessive derating
- Low DC resistance (DCR) to minimize copper loss and improve efficiency
- Reduced eddy current losses for lower self‑heating at high switching frequencies
- High vibration robustness for harsh automotive environments
- Very low audible noise, supporting quiet operation in EV/HEV and comfort systems
From a practical design perspective, the combination of low DCR and low eddy current loss helps engineers raise switching frequency or shrink magnetics while keeping thermal margins under control. For purchasing teams, a unified series with multiple footprints and inductance values simplifies sourcing and second‑sourcing strategies across platforms.
New part numbers and positioning
The line extension introduces three additional inductor types within the ETQPMY family:
- ETQ-P6M100GAC
- ETQ-P5M6R8GAK
- ETQ-P4MR33KLC
These devices fill intermediate points in the series’ inductance and size roadmap, giving power designers more flexibility to optimize efficiency, transient response and EMI. In practice, this lets engineers choose an inductor that better matches peak current needs and layout constraints without leaving the qualified ETQP family.
Exact electrical ratings such as inductance, rated current and saturation current are as per the manufacturer’s datasheets, but the part numbering and series context suggest the following high‑level positioning:
| Part number | Series / family | Target role in lineup |
|---|---|---|
| ETQ-P6M100GAC | ETQPMY high performance | Higher‑inductance option in a larger footprint |
| ETQ-P5M6R8GAK | ETQPMY high performance | Mid‑range inductance and size bridge |
| ETQ-P4MR33KLC | ETQPMY high performance | Low‑inductance, high‑current, more compact option |
Engineers should consult the official datasheets for each part to confirm exact inductance, current ratings, DCR and mechanical dimensions when finalizing a design.
Typical applications
The ETQPMY series is aimed at power conversion and noise suppression stages in automotive ECUs and power modules where high current and high temperature operation are required.
Typical use cases include:
- Noise filters for drive circuitry requiring high operating temperature and high peak‑current capability
- Boost converter inductors in on‑board chargers, lighting systems or auxiliary power supplies
- Buck converter inductors in 12 V, 24 V or 48 V DC‑DC converters feeding ECUs, sensors and infotainment systems
In these positions, the high DC bias capability reduces inductance droop at peak load, which helps maintain control loop stability and output voltage regulation during transient conditions. Low audible noise is also beneficial in cabin‑adjacent modules like infotainment, ADAS and body electronics.
Technical highlights
While the press release focuses on the family‑level characteristics, the underlying technology is consistent with Panasonic’s higher‑end automotive power inductors.
Key technical highlights:
- Core technology: Ferrous alloy (Hi‑BS) material for high saturation and low core loss at switching frequencies typically used in automotive DC‑DC converters
- Temperature capability: High heat resistance suitable for typical automotive temperature grades; exact maximum temperature and derating curves are specified in the manufacturer’s datasheets
- Electrical performance:
- Excellent DC bias characteristics to support high continuous and transient currents
- Low DCR for reduced copper losses and better efficiency
- Reduced eddy current losses, particularly important for higher‑frequency converters
- Mechanical robustness: High vibration tolerance, supporting use on engine‑mounted or chassis‑mounted ECUs
- Acoustic behavior: Very low audible noise, helping to meet OEM noise, vibration and harshness (NVH) requirements
For practical design work, engineers should review frequency‑dependent inductance and loss characteristics from the datasheet or loss curves to select an optimum switching frequency and ripple current.
Design‑in notes for engineers
When designing in the new ETQPMY series inductors, several practical considerations help ensure robust performance:
- Thermal design:
- Use the manufacturer’s recommended maximum temperature and loss data to estimate inductor self‑heating under worst‑case ripple and ambient conditions.
- Ensure adequate copper area and, where necessary, thermal vias beneath the component to spread heat.
- DC bias and inductance:
- Check inductance vs. DC bias curves to ensure the chosen part maintains sufficient inductance at peak current and during load transients.
- For tight control loops in buck or boost converters, verify loop stability at the minimum effective inductance across temperature and tolerance.
- EMI and noise:
- Place the inductor close to the switching device and decoupling capacitors to minimize loop area and radiated emissions.
- The low audible noise specification is an advantage, but layout and mechanical mounting (e.g., avoiding board flexing) still influence acoustic behavior.
- Mechanical robustness and reliability:
- Follow Panasonic’s recommended land pattern and soldering profiles to minimize mechanical stress during reflow.
- In high‑vibration zones, consider conformal coating or mechanical support if required by OEM guidelines, even though the inductors themselves are designed with high vibration tolerance.
- Qualification and compliance:
- Confirm AEC‑Q200 qualification and, if needed, PPAP documentation for automotive programs through the manufacturer or distributor.
- Ensure the chosen inductor variant meets the specific temperature grade and reliability level defined by the vehicle OEM.
Using the ETQPMY series across multiple converter rails can simplify qualification and reduce the number of magnetic vendors in a platform, which is often a purchasing and logistics advantage.
Source
This article is based on information published by Panasonic Industrial Devices in its official announcement of the ETQPMY series high‑performance automotive power inductors line extension, complemented with general design‑in considerations for automotive power electronics. Exact electrical and mechanical values should be confirmed in the official datasheets for each part number.
References
- Panasonic Industrial Devices – Line Extension High Performance Type ETQP*M***Y*** Series Power Inductors for Automotive Applications
- Panasonic ETQP*M***Y*** Series Power Inductors for Automotive Applications – Product overview and parametric listing
- Panasonic ETQP*M***Y*** Series Power Inductors for Automotive Applications – Datasheet download