Renesas AT25DF256-MAHNGU-Y

Overview

AT25DF256-MAHNGU-Y from Renesas Electronics is a 256-Kbit SPI serial Flash memory IC designed for code shadowing and data storage in embedded systems. It operates from 1.65 V to 3.6 V, supports SPI Modes 0/3 and Dual-Output Read, delivers 104 MHz max clock frequency, achieves 6 ns clock-to-output delay, and features flexible erase granularity (256-byte page, 4-kB/32-kB blocks, full chip) - deployed in industrial controllers and IoT edge nodes requiring reliable nonvolatile storage.

For engineers reviewing the AT25DF256-MAHNGU-Y datasheet, AT25DF256-MAHNGU-Y pinout, AT25DF256-MAHNGU-Y application, or AT25DF256-MAHNGU-Y equivalent, key selection criteria include its dual-output read throughput, ultra-deep power-down current (200 nA), OTP security register (128 bytes), hardware write protection via WP pin, and JEDEC-standard ID read capability.

Technical Context

The AT25DF256-MAHNGU-Y implements a dedicated SPI interface with four signal lines (CS, SCK, SI/I/O0, SO/I/O1) and supports both standard and dual-output read modes using distinct opcodes (03h/0Bh and 3Bh). Its internal address counter auto-increments during sequential reads, and command execution relies on CS assertion followed by MSB-first opcode transmission.

Device operation requires explicit Write Enable (06h) before programming or erasing; protection is enforced via status register bits (SRWD, BP[2:0]) and hardware WP pin control. Erase cycles are internally self-timed, and failure detection is automatic with status flag reporting.

Key Specifications

Pinout & Package

AT25DF256-MAHNGU-Y is packaged in an 8-lead SOIC (150-mil) per JEDEC standard. Pin functions are electrically validated and match all three package variants (SOIC, TSSOP, UDFN) in signal assignment.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial Flash memory applications.

Compared with W25Q256JVSIM and MX25L25635FMI-12G, the AT25DF256-MAHNGU-Y offers uniquely low-power operation, integrated OTP security, and dual-output read - making it optimal for compact, battery-aware, or identity-critical embedded systems rather than high-density or pure cost-driven applications.

Availability

AT25DF256-MAHNGU-Y is available at Aetrix Electronics and suitable for industrial PLCs, IoT sensor nodes, medical handhelds, and smart meter deployments requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT25DF256-MAHNGU-Y includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader delivering trusted microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.

The AT25DF256 product line targets resource-constrained embedded systems needing reliable, low-voltage serial Flash with enhanced security and power efficiency - optimized for code shadowing and mixed code+data storage.

FAQ

What is the maximum clock frequency supported by the AT25DF256-MAHNGU-Y during standard Read Array operations?

The AT25DF256-MAHNGU-Y supports up to 104 MHz for Read Array using the 0Bh opcode. At this rate, clock-to-output delay is specified at 6 ns. The legacy 03h opcode is limited to 33 MHz and is intended for lower-speed compatibility. This high-frequency capability enables fast instruction fetch in MCU-based systems relying on external flash for boot code.

Does the AT25DF256-MAHNGU-Y support hardware write protection, and how is it implemented?

Yes, the AT25DF256-MAHNGU-Y implements hardware write protection via the WP pin, which is active-low and internally pulled high. When WP is driven low and the Block Protection Lock (BPL) bit in the status register is set, protected memory sectors become immune to program/erase commands regardless of software state. This provides fail-safe protection against accidental writes during power transients or firmware faults.

How does the Dual-Output Read feature of the AT25DF256-MAHNGU-Y improve system performance?

The AT25DF256-MAHNGU-Y's Dual-Output Read (opcode 3Bh) uses both SI and SO pins as outputs to deliver two bits per clock cycle, effectively doubling read throughput compared to standard single-output mode. This reduces firmware validation time and accelerates code shadowing into RAM - particularly valuable in real-time embedded applications where SPI bus bandwidth is constrained.

What is the purpose and structure of the OTP Security Register in the AT25DF256-MAHNGU-Y?

The AT25DF256-MAHNGU-Y includes a 128-byte One-Time Programmable (OTP) Security Register: 64 bytes are factory-programmed with a unique device identifier, and 64 bytes are user-programmable for ESN, cryptographic keys, or calibration data. Once written, OTP contents cannot be altered - providing immutable device identity and secure storage for sensitive information without external security ICs.

Can the AT25DF256-MAHNGU-Y operate across the full industrial temperature range, and what voltage constraints apply?

The AT25DF256-MAHNGU-Y is rated for –40 °C to +85 °C operation, but only when supplied with 1.7 V to 3.6 V. At the lower 1.65 V minimum supply, the operational temperature range is restricted to –10 °C to +85 °C. Designers must verify voltage margins under worst-case thermal and load conditions to maintain full temperature coverage.