In the design of white goods (e.g., air conditioners, washing machines) and industrial motor control systems, accurate AC voltage zero-cross detection is critical for synchronous control, EMI suppression, and energy efficiency. ROHM Semiconductor, a global leader in power management semiconductors, has redefined this space with its BM1ZxxxFJ series zero-cross detection ICs—engineered to eliminate photocouplers, cut standby power to near-zero, and ensure high precision across global AC voltage standards. These ICs address the core pain points of traditional circuits (high 功耗，long delay, aging risks) while simplifying design for manufacturers worldwide. To ensure genuine procurement and reliable support, ROHM partners with top-tier authorized distributors, making it easy for users to source these innovative components.

Core Product Lines & Technical Advantages

ROHM’s BM1ZxxxFJ series stands out as a benchmark for zero-cross detection, with tailored features for white goods and industrial applications. Key details (sourced from ROHM’s official specs) include:

1. Breakthrough Photocoupler-Less Design

Traditional zero-cross circuits rely on photocouplers, which account for 50% of a device’s standby power and degrade over time. The BM1ZxxxFJ series eliminates this component entirely, achieving:

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Ultra-Low Standby Power: 0.01W (10mW) during continuous operation—far below global energy efficiency standards (e.g., EU ERP, China GB 20943).

Reduced BOM Cost: Cuts external components by 30% (no need for photocouplers, transistors, or voltage dividers), simplifying PCB layout.

Longer Reliability: Eliminates age-related performance degradation from photocoupler luminous intensity loss, extending product lifespan by 5+ years.

2. High Precision for Global Applications

To adapt to varying AC voltages (100V-230V) across regions, the BM1ZxxxFJ series delivers unmatched accuracy:

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Narrow Delay Error: ±50µs max delay variation vs. AC voltage, enabling precise MCU and motor synchronization—critical for energy-efficient motor driving in washing machines and air conditioners.

Wide Voltage Compatibility: Supports input voltages up to 600V, with a built-in voltage clamp function (limits output to ≤4.8V) to protect downstream 5V MCUs from overvoltage damage.

Temperature Resilience: Operates reliably from -40℃ to 105℃, suitable for harsh environments like under-the-hood industrial equipment or outdoor AC units.

3. Easy Replacement & Product Portfolio

The BM1ZxxxFJ series is designed for drop-in compatibility with legacy photocoupler-based circuits, requiring no software changes. Key models include:

Table: ROHM BM1ZxxxFJ Series Key Specifications (Source: ROHM Official Datasheet)