Renesas AT25EU0081A-SSUN-B

Overview

AT25EU0081A-SSUN-B from Renesas Electronics is an 8-Mbit ultra-low-energy serial NOR flash memory IC supporting SPI, Dual SPI, and Quad SPI interfaces. It operates across 1.65 V–3.6 V, delivers up to 108 MHz read speed, and achieves 100 nA deep power-down current - optimized for battery-powered IoT edge nodes requiring persistent code storage with minimal energy draw.

For engineers reviewing the AT25EU0081A-SSUN-B datasheet, AT25EU0081A-SSUN-B pinout, AT25EU0081A-SSUN-B application, or AT25EU0081A-SSUN-B equivalent, key selection considerations include its quad-SPI I/O flexibility (IO0–IO3), page-erase capability (256-byte granularity), 10k program/erase endurance, software/hardware write protection, and UDFN 2×3 mm package compatibility with space-constrained embedded designs.

Technical Context

The AT25EU0081A-SSUN-B implements a flexible erase architecture with constant-time 8 ms typical erase durations across page (256 B), 4/32/64 kB block, and full-chip modes - independent of block size. Its command set includes suspend/resume for program and erase operations, enabling concurrent read access during background non-volatile writes.

Quad SPI operation requires explicit configuration via the non-volatile Quad Enable (QE) bit in Status Register 2; once enabled, WP and HOLD pins function as IO2 and IO3, supporting 4-bit-wide data transfers. The device supports JEDEC-standard manufacturer/device ID and a factory-programmed 128-bit unique serial number for traceability.

Key Specifications

Pinout & Package

AT25EU0081A-SSUN-B is packaged in an 8-pad UDFN (2 mm × 3 mm × 0.6 mm), RoHS-compliant, halogen-free, and Pb-free. Pin assignments are validated per Renesas DS-AT25EU0081A-213 Rev. C Figure 3 and Table 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial NOR flash memory applications.

Compared with W25Q80DVSSIG and MT25QL08GA8E12-0SIT, the AT25EU0081A-SSUN-B uniquely combines 1.65 V operation, 100 nA deep power-down, 256-byte page erase, and OTP security - making it the only option validated for multi-year battery life in constrained-edge IoT nodes requiring secure, fine-grained firmware updates.

Availability

AT25EU0081A-SSUN-B is available at Aetrix Electronics and suitable for wireless sensor nodes, industrial PLCs, medical wearables, and smart metering systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for AT25EU0081A-SSUN-B 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 embedded solutions for automotive, industrial, infrastructure, and IoT applications, with deep expertise in low-power memory and microcontroller integration.

The AT25EU0081A-SSUN-B belongs to Renesas' ultra-low-energy serial flash product line, designed specifically for battery-powered edge devices where minimizing active and standby power consumption is critical to multi-year operational lifetime.

FAQ

What is the operating voltage range supported by the AT25EU0081A-SSUN-B?

The AT25EU0081A-SSUN-B supports a wide operating voltage range of 1.65 V to 3.6 V, enabling direct interfacing with both 1.8 V and 3.3 V logic families without level-shifting circuitry. This range is validated per Renesas DS-AT25EU0081A-213 Rev. C Table 19 and applies across the full -40 °C to +85 °C temperature range. The AT25EU0081A-SSUN-B maintains full functionality including Quad SPI, program, and erase operations across this entire voltage window.

Does the AT25EU0081A-SSUN-B support Quad SPI mode, and how is it enabled?

Yes, the AT25EU0081A-SSUN-B supports Quad SPI mode using commands such as Fast Read Quad I/O (EBh). Activation requires setting the Quad Enable (QE) bit in Status Register 2 to '1' via the Write Status Register command. Once enabled, the WP and HOLD pins become IO2 and IO3 respectively, completing the four-line I/O bus. The AT25EU0081A-SSUN-B retains QE state across power cycles since it is stored in non-volatile register memory.

What is the smallest erasable unit for the AT25EU0081A-SSUN-B, and what is its typical erase time?

The smallest erasable unit for the AT25EU0081A-SSUN-B is a 256-byte page, with a typical erase time of 8 ms. This page-erase capability - alongside 4/32/64 kB block and full-chip erase - enables efficient partial updates without disturbing adjacent data. All erase operations, regardless of size, exhibit consistent 8 ms typical duration due to the device's flexible erase architecture, as confirmed in Renesas DS-AT25EU0081A-213 Rev. C Section 1 and Table on Page 1.

How does the AT25EU0081A-SSUN-B achieve ultra-low power consumption in deep power-down mode?

The AT25EU0081A-SSUN-B achieves 100 nA typical deep power-down current by disabling all internal circuitry except essential retention latches and wake-up logic. Entry is triggered via the Deep Power-Down command (B9h), and exit occurs with Release Power-Down (ABh). This mode preserves memory contents while drawing negligible current - critical for multi-year battery life in IoT endpoints. The AT25EU0081A-SSUN-B specification is verified in DS-AT25EU0081A-213 Rev. C Table 21 (DC Characteristics).

What security features are implemented in the AT25EU0081A-SSUN-B for firmware protection?

The AT25EU0081A-SSUN-B integrates three 512-byte security registers with one-time-programmable (OTP) lock capability, software/hardware write protection (via WP pin and SRP bits), and top/bottom block selection. These features allow secure storage of cryptographic keys, boot images, and calibration data. The AT25EU0081A-SSUN-B also supports JEDEC-standard device ID and a factory-programmed 128-bit unique serial number for traceability and anti-counterfeiting, as documented in Sections 1 and 5 of DS-AT25EU0081A-213 Rev. C.