Renesas AT25DF021A-XMHNHR-T

Overview

AT25DF021A-XMHNHR-T from Renesas Electronics is a 2-Mbit serial SPI Flash memory IC optimized for code shadowing and mixed code/data storage in embedded systems. It operates from 1.65 V to 3.6 V across –40°C to +85°C, supports Dual-I/O read mode at up to 104 MHz, delivers 6 ns clock-to-output timing, and features uniform 4-kByte/32-kByte/64-kByte block erase plus 256-Byte page erase.

For engineers reviewing the AT25DF021A-XMHNHR-T datasheet, AT25DF021A-XMHNHR-T pinout, AT25DF021A-XMHNHR-T application, or AT25DF021A-XMHNHR-T equivalent, key selection criteria include SPI Mode 0/3 compatibility, hardware write protection via WP pin, OTP security register programmability, ultra-low deep power-down current (200 nA), and support for industrial temperature range without external voltage boosters.

Technical Context

The AT25DF021A-XMHNHR-T implements a flexible SPI-compatible interface with dual I/O capability enabling two-bit-per-clock data transfer during Dual-Output Read operations. Its internal architecture includes SRAM data buffers, Y/X decoders, and dedicated control logic for sector protection and status monitoring.

It integrates hardware-based write protection via the WP pin and software-controlled locking through status register bits, alongside a 128-byte OTP security register-64 bytes factory-programmed with a unique identifier and 64 bytes user-programmable-for secure device serialization and ESN storage.

Key Specifications

Pinout & Package

AT25DF021A-XMHNHR-T is packaged in an 8-pin Ultra Thin DFN (2 mm × 3 mm × 0.6 mm) with wettable flank leads, suitable for automated optical inspection (AOI) and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q20EW and MT25QL02GA, the AT25DF021A-XMHNHR-T uniquely combines wide 1.65–3.6 V operation, 200 nA ultra-deep power-down, and factory-programmed OTP ID-making it optimal for industrial and medical designs demanding supply flexibility, extreme low-power sleep, and traceable device identity.

Availability

AT25DF021A-XMHNHR-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive infotainment boot memory, and IoT edge node configuration requiring stable component supply across extended product lifecycles.

Supply support for AT25DF021A-XMHNHR-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 microcontrollers, analog, power, and memory solutions for automotive, industrial, infrastructure, and IoT applications.

The AT25DF021A-XMHNHR-T belongs to Renesas' serial Flash memory product line, engineered specifically for reliable, low-voltage, mixed-code-and-data storage in resource-constrained embedded systems with stringent power and security requirements.

FAQ

What is the operating temperature range supported by the AT25DF021A-XMHNHR-T?

The AT25DF021A-XMHNHR-T is rated for full industrial temperature operation from –40°C to +85°C. It also supports extended operation up to +125°C with derated endurance (20,000 cycles) and adjusted voltage range (1.7 V – 3.6 V). This dual-range specification makes the AT25DF021A-XMHNHR-T suitable for both standard industrial controls and under-hood automotive subsystems where thermal margins are tight.

Does the AT25DF021A-XMHNHR-T support Quad-I/O or only Dual-I/O?

The AT25DF021A-XMHNHR-T supports Serial Peripheral Interface (SPI) Modes 0 and 3 and explicitly supports Dual-I/O Read operation using SI (I/O0) and SO (I/O1) pins. It does not support Quad-I/O (four data lines); its datasheet specifies only Dual-Output Read and Dual-Input Program commands. For Quad-I/O functionality, designers should consider alternatives such as the Micron MT25QL02GA.

How is hardware write protection implemented on the AT25DF021A-XMHNHR-T?

Hardware write protection on the AT25DF021A-XMHNHR-T is controlled via the WP (Write Protect) pin, which is active-low and internally pulled high. When WP is driven low, it locks protected sectors regardless of software status register settings-providing fail-safe, non-volatile protection that persists across power cycles. This complements software-based sector protection and is essential for safeguarding bootloader regions in safety-critical applications.

What is the purpose and structure of the OTP security register in the AT25DF021A-XMHNHR-T?

The AT25DF021A-XMHNHR-T 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 secure data such as cryptographic keys or calibration constants. Once written, OTP bytes cannot be erased or rewritten, ensuring permanent device identity and tamper-resistant storage for regulatory compliance and anti-cloning measures.

Can the AT25DF021A-XMHNHR-T operate from a 1.8 V supply in industrial temperature range?

Yes, the AT25DF021A-XMHNHR-T fully supports 1.8 V operation across the industrial temperature range (–40°C to +85°C), as confirmed by its specified supply range of 1.65 V – 3.6 V. All key parameters-including 104 MHz max clock, 6 ns tV, and 100,000-cycle endurance-are guaranteed at 1.8 V within this temperature range, enabling direct integration with 1.8 V FPGA, MCU, and SoC interfaces without level translation.