Renesas AT25EU0081A-SSUN-T

Overview

AT25EU0081A-SSUN-T from Renesas Electronics is an 8-Mbit ultra-low-energy serial NOR Flash memory IC designed for battery-powered IoT edge devices. It operates across 1.65 V–3.6 V, supports SPI modes 0/3, delivers up to 108 MHz read speed, and enables quad I/O (1,1,4)/(1,4,4) operations - used for firmware storage and XIP (eXecute-In-Place) code execution in compact wireless sensor nodes.

For engineers reviewing the AT25EU0081A-SSUN-T datasheet, AT25EU0081A-SSUN-T pinout, AT25EU0081A-SSUN-T application, or AT25EU0081A-SSUN-T equivalent, key selection criteria include its 100 nA deep power-down current, 256-byte page erase capability, 3×512-byte OTP-locked security registers, and UDFN-8 (2×3 mm) package compatibility with space-constrained PCB layouts.

Technical Context

The AT25EU0081A-SSUN-T implements a flexible erase architecture with constant-time 8 ms typical block/page/sector erase - independent of block size - enabling efficient partial updates in firmware-over-the-air (FOTA) workflows. Its dual/quad SPI interface uses configurable IO0–IO3 pins (SI/SO/WP/HOLD), where WP and HOLD serve as bidirectional I/Os when Quad Enable (QE) bit in Status Register 2 is set.

It integrates three status registers (SR1–SR3) with non-volatile protection bits (SRP0/SRP1), software/hardware write protection, and a 128-bit unique serial number. The device enters Deep Power-Down (DPD) mode via command 0xB9, reducing current to 100 nA while retaining data - critical for multi-year battery life in environmental monitors and asset trackers.

Key Specifications

Pinout & Package

AT25EU0081A-SSUN-T is packaged in an 8-pad, 2 mm × 3 mm × 0.6 mm UDFN (Ultra Thin Dual Flat No-lead) with wettable flanks, RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with W25Q80DVSSIG and MT25QL80ABB8E12-0SIT, the AT25EU0081A-SSUN-T uniquely delivers sub-100 nA deep power-down, true 256-byte erasable pages, and factory-programmable OTP security - making it the only option among the three qualified for decade-long battery-powered FOTA deployments with cryptographic integrity.

Availability

AT25EU0081A-SSUN-T is available at Aetrix Electronics and suitable for wireless sensor nodes, firmware-update-enabled asset trackers, industrial edge controllers, and smart home hubs requiring stable component supply with guaranteed long-term manufacturability.

Supply support for AT25EU0081A-SSUN-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 embedded solutions for automotive, industrial, infrastructure, and IoT markets, with strong IP in low-power Flash and microcontroller architectures.

The AT25EU0081A-SSUN-T belongs to Renesas' ultra-low-energy serial Flash family, engineered specifically for battery-constrained edge devices that demand multi-year operation, secure firmware storage, and high-speed quad-SPI performance without compromising energy efficiency.

FAQ

What is the package type and dimensions of the AT25EU0081A-SSUN-T?

The AT25EU0081A-SSUN-T uses an 8-pad UDFN package measuring 2.0 mm × 3.0 mm × 0.6 mm with wettable flanks. This compact, lead-free, RoHS-compliant package is optimized for high-density PCB layouts in space-constrained IoT endpoints. The "SSUN-T" suffix explicitly denotes this UDFN variant, distinguishing it from SOIC versions (e.g., SSHT-T). Pin pitch is 0.5 mm, and thermal pad is exposed on the bottom for enhanced heat dissipation.

Does the AT25EU0081A-SSUN-T support execute-in-place (XIP) operation?

Yes, the AT25EU0081A-SSUN-T supports XIP operation via its high-speed quad SPI interface. With Fast Read Quad I/O (0xEB) commands and 108 MHz clock capability, it delivers sustained read throughput sufficient for direct code execution from Flash on compatible microcontrollers. Its uniform 256-byte page architecture and low-latency read timing (tV < 6 ns) ensure deterministic instruction fetch performance without external RAM buffering.

How does the AT25EU0081A-SSUN-T achieve 100 nA deep power-down current?

The AT25EU0081A-SSUN-T achieves 100 nA typical deep power-down (DPD) current through dedicated low-leakage circuit design, including gated internal voltage regulators, clock-gated logic blocks, and optimized charge-pump shutdown sequencing. Entry into DPD mode is triggered by command 0xB9, which disables all I/O drivers, internal oscillators, and memory array biasing - verified across -40°C to +85°C per DS-AT25EU0081A-213 Rev. C.

Can the AT25EU0081A-SSUN-T be used with both 1.8 V and 3.3 V microcontrollers?

Yes, the AT25EU0081A-SSUN-T operates across 1.65 V–3.6 V, making it fully compatible with both 1.8 V and 3.3 V host systems without level-shifting circuitry. Its VIH/VIL thresholds scale with VCC, and DC/AC characteristics (e.g., tSU, tH, tV) are specified across the full voltage range in Tables 21–25 of the datasheet. This single-part flexibility simplifies BOM management across mixed-voltage designs.

What security features does the AT25EU0081A-SSUN-T provide for firmware protection?

The AT25EU0081A-SSUN-T provides three 512-byte security registers with one-time-programmable (OTP) lock bits, software/hardware write protection via WP pin and SRP0/SRP1 bits, and status register protection via BP0–BP3. These features enable secure storage of cryptographic keys, bootloader signatures, and device-specific credentials - preventing unauthorized firmware modification, cloning, or replay attacks in certified IoT deployments.