How Domestic NOR Flash Chip PY25Q128HA-SUH Meets the Requirements of Grid Edge Terminals

With the accelerated construction of new power systems, smart grid edge terminals deployed at substations, power distribution rooms, and transmission lines—such as smart integration terminals, station area intelligent terminals, and fault indicators—are increasingly taking on multiple roles including data acquisition, local computing, remote communication, and security protection. These devices typically face stringent requirements:

•   7x24 continuous operation, requiring hardware lifespan to exceed 10 years.

•   Harsh deployment environments: prolonged exposure to high temperatures above 60°C, high humidity, and strong electromagnetic interference (EMI).

•   Dependence on OTA remote updates: Firmware updates 3-5 times per year challenge the endurance of storage chips.

•   Strong domestic procurement policies: State Grid and China Southern Grid mandate ≥70% localization rate for core chips.

•   Low-power design needs: Some terminals are powered by PT (potential transformer) harvesting, limiting total device power.

As the core component for system boot and firmware storage, NOR Flash must simultaneously meet four key criteria: high reliability, low power consumption, wide temperature adaptability, and domestic autonomy.

Why Choose the PY25Q128HA-SUH?

In a domestically-developed smart grid edge terminal based on the Feiteng D2000 main controller, PUYA Semiconductor's PY25Q128HA-SUH was ultimately chosen to replace the original Winbond W25Q128JVSIQ:

1.  Sufficient Capacity, Faster Boot

    The terminal software system includes U-Boot (2MB), secure boot module (1MB), Recovery OS (8MB), and log cache (1MB), totaling ~12MB. The PY25Q128HA-SUH provides 16MB (128Mb) capacity, leaving ~25% headroom for future expansion. It supports a Quad SPI interface (133MHz), with a measured cold-start time of ≤1.3 seconds, ensuring rapid response during grid faults.

2.  Lower Power Consumption, Exceptionally Energy-Efficient

    Since some terminals rely on PT power harvesting, the total device standby power must be under 2W, making static current critical. The PY25Q128HA-SUH has a typical standby current of ≤8 µA (@3.3V), 20% lower than the W25Q128JVSIQ (≤10 µA). Combined with host GPIO control, it can enter a deep power-down mode (<1 µA), cutting power completely during non-communication periods. Annually, this can save ~0.5 kWh per device—offering significant energy savings at a ten-thousand-unit deployment scale.

3.  Withstands Extreme Temperatures and Strong Interference

    The chip operates from -40°C to +85°C, covering environments from the winter of Mohe to the summer of Sanya. Its endurance rating is ≥100,000 program/erase cycles; even with 5 OTA updates per year, its theoretical lifespan exceeds 50 years. Crucially, it has passed IEC 61000-4 series EMC tests (including ESD ±8kV, EFT ±2kV), ensuring stable firmware reads and preventing crashes or boot failures even under the strong EMI generated by switching operations.

4.  Truly Domestic, Compliant, and Secure

    The PY25Q128HA-SUH is designed by the Chinese company PUYA Semiconductor, with wafer manufacturing relying on SMIC's mature NOR Flash process, achieving a fully autonomous and controllable supply chain. It meets the power industry's mandatory localization rate requirements. Furthermore, it has completed full-stack compatibility certification with mainstream domestic hardware/software like Feiteng CPUs, Kylin OS, and Dameng databases. Housed in an 8-pin SOIC (208mil) package, it is pin-to-pin compatible with the W25Q128JVSIQ, enabling direct replacement without PCB modifications, significantly reducing engineering switching costs.

The PY25Q128HA-SUH, with its low power consumption, high compatibility, and strong reliability, emerges as the preferred storage solution for grid edge terminals.

About Mandu Technology

Shenzhen Mandu Technology Co., Ltd. has steadfastly centered its operations on the distribution of high-performance, high-quality, and highly reliable integrated circuit products. Its portfolio encompasses memory chips, differential crystal oscillators, and MCU microcontrollers, while progressively integrating analog signal chain products. The company prides itself on delivering comprehensive and cost-effective solutions to its customers. Its products find applications across a broad spectrum of industries, including but not limited to network communication, industrial control, robotics, medical equipment, personal health, and numerous other fields.

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