Renesas AT25DF256-MAHNGU-T

Overview

AT25DF256-MAHNGU-T from Renesas Electronics is a 256-Kbit serial Flash memory IC with SPI interface, dual-output read capability, 104 MHz max clock frequency, 6 ns clock-to-output delay, and 1.65 V–3.6 V single-supply operation. It serves as nonvolatile code/data storage in microcontroller boot systems, firmware update modules, and embedded IoT edge nodes requiring fast, low-power reprogrammability.

For engineers reviewing the AT25DF256-MAHNGU-T datasheet, AT25DF256-MAHNGU-T pinout, AT25DF256-MAHNGU-T application, or AT25DF256-MAHNGU-T equivalent, key selection criteria include dual-output read throughput, 256-byte page erase granularity, OTP security register support, ultra-deep power-down current (200 nA), and JEDEC-standard ID read compatibility.

Technical Context

The AT25DF256-MAHNGU-T implements a standard SPI master-slave interface supporting Modes 0 and 3, with data latched on SCK rising edge and output on falling edge. Its dual-output read mode repurposes SI as I/O0 alongside SO (I/O1) to deliver two bits per clock cycle, enabling higher effective bandwidth than standard single-output reads.

Internal architecture includes a flexible erase hierarchy-256-byte pages, uniform 4-kByte blocks, 32-kByte blocks, and full-chip erase-optimized for mixed code+data storage. Protection is enforced via hardware WP pin control and software-configurable status register bits, while the 128-byte OTP register provides factory-programmed unique ID and user-programmable fields for device serialization.

Key Specifications

Pinout & Package

AT25DF256-MAHNGU-T is packaged in an 8-lead SOIC (150-mil) with industry-standard pinout compatible with JEDEC MS-012. All pins are electrically validated per Renesas DS-AT25DF256-035 Rev.G.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q256JWEIQ and MX25L25635F, AT25DF256-MAHNGU-T uniquely combines 1.65 V minimum operation, dedicated dual-output read (not quad), and integrated OTP security register-making it optimal for cost-sensitive, battery-powered, and security-aware embedded systems where simplicity and low-voltage robustness outweigh raw density or quad interface complexity.

Availability

AT25DF256-MAHNGU-T is available at Aetrix Electronics and suitable for bootloader storage, firmware update modules, and industrial sensor configuration requiring stable component supply across automotive-grade temperature ranges and long-term production programs.

Supply support for AT25DF256-MAHNGU-T 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 applications.

The AT25DF256 product line delivers SPI Flash memory optimized for code shadowing and mixed code/data storage in resource-constrained embedded systems, emphasizing low-voltage operation, fast erase granularity, and integrated security features.

FAQ

What is the maximum clock frequency supported by AT25DF256-MAHNGU-T for read operations?

The AT25DF256-MAHNGU-T supports up to 104 MHz for read operations using the 0Bh opcode (Dual-Output Read) and up to 33 MHz using the 03h opcode (standard Read Array). This dual-frequency capability allows system designers to select the optimal balance between speed and signal integrity based on PCB layout constraints and noise environment. The 104 MHz rating applies specifically to AT25DF256-MAHNGU-T under 1.65–3.6 V supply and –40 °C to +85 °C conditions.

Does AT25DF256-MAHNGU-T support hardware write protection independent of software commands?

Yes, AT25DF256-MAHNGU-T includes a dedicated WP (Write Protect) pin that enables hardware-controlled locking of protected memory sectors. When asserted low, the WP pin overrides software-based protection settings to prevent accidental or malicious writes-even if the status register is misconfigured. This feature is fully implemented in AT25DF256-MAHNGU-T per Renesas DS-AT25DF256-035 Rev.G Section 9.4, and operates independently of SPI command execution.

What is the purpose and structure of the OTP security register in AT25DF256-MAHNGU-T?

The AT25DF256-MAHNGU-T contains a 128-byte One-Time Programmable (OTP) security register divided into two 64-byte sections: the first is factory-programmed with a unique device identifier, and the second is user-programmable for keys, calibration data, or ESN storage. Once programmed, OTP bytes cannot be erased or rewritten. This register is accessed via dedicated 9Bh (Program) and 77h (Read) commands, and is physically isolated from main memory to ensure tamper resistance. Its presence is confirmed for AT25DF256-MAHNGU-T in the official datasheet Section 10.

Can AT25DF256-MAHNGU-T operate reliably at 1.65 V supply voltage across its full temperature range?

AT25DF256-MAHNGU-T is specified for 1.65–3.6 V operation over –10 °C to +85 °C. At the 1.65 V minimum, full functionality-including 104 MHz read, page program, and block erase-is guaranteed only within the extended temperature range of –40 °C to +85 °C when VCC ≥ 1.7 V. Therefore, for true 1.65 V operation across the full –40 °C to +85 °C range, designers must verify timing margins per AC characteristics in DS-AT25DF256-035 Rev.G Table 13.4. This specification applies directly to AT25DF256-MAHNGU-T.

How does the dual-output read mode function on AT25DF256-MAHNGU-T, and which pins are involved?

The dual-output read mode in AT25DF256-MAHNGU-T uses both SI (I/O0) and SO (I/O1) pins simultaneously as outputs to deliver two bits per SCK falling edge-MSB on SO and LSB on SI-effectively doubling read throughput versus standard SPI. This mode is activated using the 3Bh opcode and requires no additional hardware beyond standard SPI routing. Pin behavior is explicitly defined for AT25DF256-MAHNGU-T in Section 5.1 and Table 1 of DS-AT25DF256-035 Rev.G, confirming SI's dynamic role shift from input to output during this command.